Update CHANGELOG.md

file paths used to be url-encoded twice, which is no longer the case.

.dockerignore

@@ -0,0 +1,56 @@
+# Binaries for programs and plugins
+*.exe
+*.dll
+*.so
+*.dylib
+.idea/*
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736
+.glide/
+
+# dep related files and folders
+/vendor*
+
+# ignore logfiles (/* so the .gitkeep override works)
+/logs/*
+
+# ignore configuration file
+/config.yml
+
+# Ignore Vagrant stuff
+/.vagrant
+
+# Builds by gox
+/build
+
+# Go Coverage tool
+/coverage.out
+
+# The built executable
+wings
+wings.exe
+
+# IDE/Editor files (VS Code)
+/.vscode
+
+# test files
+test_*/
+
+# Keep all gitkeep files (This needs to stay at the bottom)
+!.gitkeep
+debug
+.DS_Store
+*.pprof
+*.pdf
+
+Dockerfile
+CHANGELOG.md
+Makefile
+README.md
+wings-api.paw

.github/FUNDING.yml

@@ -0,0 +1,2 @@
+github: [DaneEveritt]
+custom: ["https://paypal.me/PterodactylSoftware"]

.github/workflows/build-test.yml

@@ -0,0 +1,79 @@
+name: Run Tests
+
+on:
+  push:
+    branches:
+      - 'develop'
+
+  pull_request:
+    branches:
+      - 'develop'
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+
+      matrix:
+        os: [ ubuntu-20.04 ]
+        go: [ 1.15.6 ]
+        goos: [ linux ]
+        goarch: [ amd64, arm64 ]
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Code Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup Go v${{ matrix.go }}
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go }}
+
+      - name: Print Environment
+        id: env
+        run: |
+          printf "Go Executable Path: $(which go)\n"
+          printf "Go Version: $(go version)\n"
+          printf "\n\nGo Environment:\n\n"
+          go env
+          printf "\n\nSystem Environment:\n\n"
+          env
+
+          echo "::set-output name=version_tag::${GITHUB_REF/refs\/tags\//}"
+          echo "::set-output name=short_sha::$(git rev-parse --short HEAD)"
+          echo "::set-output name=go_cache::$(go env GOCACHE)"
+
+      - name: Build Cache
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.env.outputs.go_cache }}
+          key: ${{ runner.os }}-${{ matrix.go }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-${{ matrix.go }}-go
+
+      - name: Get Dependencies
+        run: |
+          go get -v -t -d ./...
+
+      - name: Build
+        env:
+          GOOS: ${{ matrix.goos }}
+          GOARCH: ${{ matrix.goarch }}
+          CGO_ENABLED: 0
+          SRC_PATH: github.com/pterodactyl/wings
+        run: |
+          go build -v -trimpath -ldflags="-s -w -X ${SRC_PATH}/system.Version=dev-${GIT_COMMIT:0:7}" -o build/wings_${{ matrix.goos }}_${{ matrix.goarch }} wings.go
+          upx build/wings_${{ matrix.goos }}_${{ matrix.goarch }}
+          chmod +x build/wings_${{ matrix.goos }}_${{ matrix.goarch }}
+
+      - name: Test
+        run: go test ./...
+
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v2
+        if: ${{ github.ref == 'refs/heads/develop' || github.event_name == 'pull_request' }}
+        with:
+          name: wings_${{ matrix.goos }}_${{ matrix.goarch }}
+          path: build/wings_${{ matrix.goos }}_${{ matrix.goarch }}

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,32 @@
+name: CodeQL
+
+on:
+  push:
+    branches:
+      - 'develop'
+  pull_request:
+    branches:
+      - 'develop'
+  schedule:
+    - cron: '0 9 * * 4'
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        language:
+          - go
+    steps:
+      - name: Code Checkout
+        uses: actions/checkout@v2
+      - name: Checkout Head
+        run: git checkout HEAD^2
+        if: ${{ github.event_name == 'pull_request' }}
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v1
+        with:
+          languages: ${{ matrix.language }}
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v1

.github/workflows/docker.yml

@@ -0,0 +1,68 @@
+name: Publish Docker Image
+
+on:
+  push:
+    branches:
+      - 'develop'
+
+    tags:
+      - 'v*'
+
+jobs:
+  push:
+    name: Push
+    runs-on: ubuntu-20.04
+
+    # Always run against a tag, even if the commit into the tag has [docker skip] within the commit message.
+    if: "!contains(github.ref, 'develop') || (!contains(github.event.head_commit.message, 'skip docker') && !contains(github.event.head_commit.message, 'docker skip'))"
+
+    steps:
+      - name: Code Checkout
+        uses: actions/checkout@v2
+
+      - name: Docker Meta
+        id: docker_meta
+        uses: crazy-max/ghaction-docker-meta@v1
+        with:
+          images: ghcr.io/pterodactyl/wings
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Install buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          version: v0.5.1
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+
+      - name: Get Build Information
+        id: build_info
+        run: |
+          echo "::set-output name=version_tag::${GITHUB_REF/refs\/tags\//}"
+          echo "::set-output name=short_sha::$(git rev-parse --short HEAD)"
+
+      - name: Release Production Build
+        uses: docker/build-push-action@v2
+        if: "!contains(github.ref, 'develop')"
+        with:
+          build-args: |
+            VERSION=${{ steps.build_info.outputs.version_tag }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
+          push: true
+          tags: ${{ steps.docker_meta.outputs.tags }}
+
+      - name: Release Development Build
+        uses: docker/build-push-action@v2
+        if: "contains(github.ref, 'develop')"
+        with:
+          build-args: |
+            VERSION=dev-${{ steps.build_info.outputs.short_sha }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.docker_meta.outputs.tags }}

.github/workflows/release.yml

@@ -0,0 +1,103 @@
+name: Create Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-20.04
+
+    steps:
+      - name: Code Checkout
+        uses: actions/checkout@v2
+
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '1.15.6'
+
+      - name: Build
+        env:
+          REF: ${{ github.ref }}
+        run: |
+          CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/pterodactyl/wings/system.Version=${REF:11}" -o build/wings_linux_amd64 -v wings.go
+          CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags="-s -w -X github.com/pterodactyl/wings/system.Version=${REF:11}" -o build/wings_linux_arm64 -v wings.go
+
+      - name: Test
+        run: go test ./...
+
+      - name: Compress binary and make it executable
+        run: |
+          upx build/wings_linux_amd64 && chmod +x build/wings_linux_amd64
+          upx build/wings_linux_arm64 && chmod +x build/wings_linux_arm64
+
+      - name: Extract changelog
+        env:
+          REF: ${{ github.ref }}
+        run: |
+          sed -n "/^## ${REF:10}/,/^## /{/^## /b;p}" CHANGELOG.md > ./RELEASE_CHANGELOG
+          echo ::set-output name=version_name::`sed -nr "s/^## (${REF:10} .*)$/\1/p" CHANGELOG.md`
+
+      - name: Create checksum and add to changelog
+        run: |
+          SUM=`cd build && sha256sum wings_linux_amd64`
+          SUM2=`cd build && sha256sum wings_linux_arm64`
+          echo -e "\n#### SHA256 Checksum\n\`\`\`\n$SUM\n$SUM2\n\`\`\`\n" >> ./RELEASE_CHANGELOG
+          echo -e "$SUM\n$SUM2" > checksums.txt
+
+      - name: Create release branch
+        env:
+          REF: ${{ github.ref }}
+        run: |
+          BRANCH=release/${REF:10}
+          git config --local user.email "ci@pterodactyl.io"
+          git config --local user.name "Pterodactyl CI"
+          git checkout -b $BRANCH
+          git push -u origin $BRANCH
+          sed -i "s/	Version = \".*\"/	Version = \"${REF:11}\"/" system/const.go
+          git add system/const.go
+          git commit -m "bump version for release"
+          git push
+
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ steps.extract_changelog.outputs.version_name }}
+          body_path: ./RELEASE_CHANGELOG
+          draft: true
+          prerelease: ${{ contains(github.ref, 'beta') || contains(github.ref, 'alpha') }}
+
+      - name: Upload amd64 Binary
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }} 
+          asset_path: build/wings_linux_amd64
+          asset_name: wings_linux_amd64
+          asset_content_type: application/octet-stream
+
+      - name: Upload arm64 Binary
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: build/wings_linux_arm64
+          asset_name: wings_linux_arm64
+          asset_content_type: application/octet-stream
+
+      - name: Upload checksum
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }} 
+          asset_path: ./checksums.txt
+          asset_name: checksums.txt
+          asset_content_type: text/plain

.gitignore

@@ -45,5 +45,6 @@ test_*/
 # Keep all gitkeep files (This needs to stay at the bottom)
 !.gitkeep
 debug
-data/.states.json
 .DS_Store
+*.pprof
+*.pdf

.travis.yml

@@ -1,47 +0,0 @@
-os: linux
-dist: xenial
-language: go
-
-go:
-- 1.13.x
-
-go_import_path: "github.com/pterodactyl/wings"
-
-services:
-- docker
-
-install:
-- mkdir -p $GOPATH/bin
-
-# Install used tools
-- go get github.com/mitchellh/gox
-- go get github.com/haya14busa/goverage
-- go get github.com/schrej/godacov
-
-- go mod download
-
-script:
-- make cross-build
-- goverage -v -coverprofile=coverage.out ./...
-- godacov -t $CODACY_TOKEN -r ./coverage.out -c $TRAVIS_COMMIT
-
-deploy:
-  provider: releases
-  api_key:
-    secure: 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
-  file_glob: true
-  file: build/*
-  on:
-    tags: true
-    branch: master
-
-notifications:
-  email: false
-  webhooks:
-    urls:
-      - https://misc.schrej.net/travistodiscord/pterodev.php
-    on_success: change
-    on_failure: always
-    on_error: always
-    on_cancel: always
-    on_start: never

CHANGELOG.md

@@ -1,5 +1,336 @@
 # Changelog
 
+## v1.2.1
+### Fixed
+* Fixes servers not be properly marked as no longer transfering if an error occurs during the archive process.
+* Fixes problems with user detection when running Wings inside a Docker container.
+* Fixes filename decoding issues with multiple endpoints related to the file manager (namely move/copy/delete).
+* **[Security]** Fixes vulnerability allowing a malicious user to abuse the remote file download utilitity to scan or access resources on the local network.
+* Fixes network `tx` stats not correctly being reported (was previously reporting `rx` for both `rx` and `tx`).
+
+### Changed
+* Cleans up the logic related to polling resources for the server to make a little more sense and not do pointless `io.Copy()` operations.
+
+## v1.2.0
+### Fixed
+* Fixes log compression being set on the Docker containers being created to avoid errors on some versions of Docker.
+* Cleaned up logic handling server resource usage to avoid race conditions in the future and make the logic simpler.
+* Fixes directories being created when writing a file before checking if there was space for the file to even be written to the disk.
+* Significant performance and resource usage fixes to backups and server transfers to avoid obliterating machine `i/o` and causing excessive resource exhaustion on busy systems or low end machines.
+* Fixes server install process to not unintentionally exit and cause invalid states if a line during the install process was too long.
+* Fixes symlink error handling in backups to not unexpectedly tank a request. Any errors due to a symlink are now ignored and will not impact the generation of a backup (including for server transfers).
+
+### Changed
+* Changed `--debug` flag to no longer ignore certificate errors on requests. Use `--ignore-certificate-errors` to ignore any certificate errors encountered when in development environments.
+* Changed all Filesystem related errors to be of the same internal error type making error checking significantly easier and less error prone.
+* Improves log output stacktraces to be more accurate as to the source of the issue.
+
+### Added
+* Adds support for downloading files to a server's data directory and optionally checking the status of or canceling in-progress downloads.
+* Adds a `context.Context` to `server.Server` structs allowing for cancelation of long running background tasks when a server is deleted without additional complexity on developer's end.
+
+## v1.1.3
+### Fixed
+* Fixes `archive/tar: write too long` error when creating a server backup.
+* Fixes server installation docker images not using authentication properly during the pull.
+* Fixes temporary transfer files not being removed after the transfer is completed.
+* Fixes TLS certificate checking to be all lowercase to avoid any lookup issues when an all-caps domain is provided.
+* Fixes multiple interfaces with the same port not being publishable for a server.
+* Fixes errors encountered during websocket processes being incorrectly passed back to the Panel as a JWT error rather than a generic Wings error for admin users.
+
+### Added
+* Added logic to notify the Panel when archive generation fails.
+* Added endpoint to run `chmod` commands against server files and updated API response to include the mode bits when requesting files.
+
+### Changed
+* Updated internals to call `Server.Environment.State()` rather than deprecated `Server.GetState()` functions.
+* Improved error handling logic and massively simplified error passing around the codebase.
+
+## v1.1.2
+### Fixed
+* Fixes binaries built as part of the release process not being usable in MUSL based environments (such as our Docker images).
+* Fixes server states being incorrectly set back to offline when a server is started after a system restart.
+
+### Changed
+* Improved logic for cleaning `allowed_mount` paths for consistency.
+* Certain context cancelation deadline errors are no longer wrong reported at an error level (since they're expected).
+* Very minor micro-optimizations for some string handling with server console output.
+
+### Added
+* Added a hidden option to disable all disk checking for servers by setting the `disk_check_interval` to `0` in the config file.
+
+## v1.1.1
+### Fixed
+* Fixes certain files returning invalid data in the request due to a bad header set after sending data down the line.
+
+## v1.1.0
+This release **requires** `Panel@1.1.0` or later to run due to API changes.
+
+### Added
+* Adds support for denying client JWT access to specific token keys generated before Wings starts, or before an arbitrary date from an API call.
+* Adds support for a configurable number of log messages to be returned when connecting to a server socket and requesting the logs.
+* Adds support for both CPU and Memory profiling of Wings via a CLI argument.
+
+### Fixed
+* Errors encountered while uploading files to Wings are now properly reported back to the client rather than causing a generic 500 error.
+* Servers exceeding their disk limit are now properly stopped when they exceed limits while running.
+* Fixes server environment starting as an empty value rather than an "offline" value.
+
+### Changed
+* Cleaned up code internals for handling API requests to make it easier on new developers and use a more sane system.
+* Server configuration retrieval from the Panel is now done in a paginated loop rather than a single large call to allow systems with thousands of instances to boot properly.
+* Switches to multipart S3 uploads to handle backups larger than 5GB in size.
+* Switches the error handling package from `pkg/errors` to `emperror` to avoid overwriting existing stack traces associated with an error and provide additional functionality.
+
+## v1.0.1
+### Added
+* Adds support for ARM to build outputs for wings.
+
+### Fixed
+* Fixed a few docker clients not having version negotiation enabled.
+* Fixes local images prefixed with `~` getting pulled from remote sources rather than just using the local copy.
+* Fixes console output breaking with certain games when excessive line length was output.
+* Fixes an error when console lines were too long that would cause the console to stop updating until the server was restarted,
+
+### Changed
+* Simplified timezone logic for containers by properly grabbing the system timezone and then passing that through to containers with the `TZ=` environment variable.
+
+## v1.0.0
+This is the first official stable release of Wings! Please be aware that while this specific version changelog is very short,
+it technically includes all of the previous beta and alpha releases within it. For the sake of version history and following
+along though, I've only included the differences between this version and the previous RC build.
+
+### Fixed
+* Fixes file parser not properly appending newline character to modified lines.
+* Fixes server disk usage not being properly reported back to the API and websocket.
+
+### Changed
+* Changes diagnostics endpoint URL to be `ptero.co` rather than `hastebin.com`.
+* Diagnostics report now includes system time for easier debugging of logs and container issues.
+
+## v1.0.0-rc.7
+### Fixed
+* **[Security]** Prevents the `allowed_mounts` configuration value from being set by a remote API call.
+* Fixes an unexpected error when attempting to make a copy of an archive file.
+* Fixes certain expected filesystems errors being returned to the API as a 500 error rather than a 4XX series error.
+* Fixes a panic crash when there is no text on a line and the parser is attempting to determine if the line is a comment.
+* Fixes multiple filesystem operations to correctly check, increment, and decrement disk usage for a server.
+* Fixes a negative disk space usage issue when deleting a file due to a bad int swap.
+* Errors from a websocket connection being closed will no longer spam the console.
+* Fixes an extraneous `.` in the install script for servers causing errors in some scenarios.
+* Fixes unexpected error spam due to a change in how `os.ErrNotExist` is returned from some functions.
+
+### Changed
+* Stacktrace is no longer emitted when warning that an image exists locally.
+* Configuration parser now attempts to create the directory structure leading to a configuration file if it is missing.
+* If a file name is too long for the system a nice error is returned to the caller.
+* Enables client version negotiation for Docker to support more versions.
+* Disk space errors are no longer logged into the wings logs.
+* Servers can no longer be reinstalled while another power action is currently running. This avoids data collisions and wings running into issues with the container state.
+* Wings now uses `1024` rather than `1000` bytes when calculating the disk space usage for a server to match how the Panel reports usage.
+* JWT errors in the websocket are now sent back to the connection as a specific event type allowing them to be handled even if the timer fails to execute or executes but is not being listened for.
+* A server struct is no longer embedded in the virtual filesystem allowing for easier testing and modularization of the codebase.
+* Server websockets are now closed when a server is deleted, disconnecting any currently connected clients.
+
+### Removed
+* **[Security]** Removes the `SafeJoin` function which could wrongly assume the state of a file and allow a user to escape the root if the developer implementing the call calls `Stat` rather than `Lstat`.
+
+## v1.0.0-rc.6
+### Fixed
+* Fixes race condition when checking if the running state of a server has changed.
+* Fixes files mistakenly unpacking themselves to the root directory rather than the directory they are told to unpack to.
+* Fixes console output not being sent to the websocket in the same order that it was received.
+* Fixes a file busy error causing a 500 error response when unpacking an archive rather than a 400 error with a message indicating what is wrong to the user.
+* Fixes docker image not properly updating when a server is started.
+
+### Changed
+* Replaces fragile event bus logic with a more robust and easier to understand system. This fixes all remaining console and stats output issues that have been reported.
+* Cleans up API response error messaging to avoid empty errors being logged which cannot be acted upon.
+* Adds support for retrying a file write a few times with a back-off if the file is busy when the write occurs.
+
+### Added
+* Docker image pull data is shown in the console when an admin is connected to the websocket.
+* Adds console throttling to stop a server if too much data is being piped out of the console. This logic mimics the logic present in the old Nodejs daemon, but with a 2x line count limit (1000 -> 2000) per period.
+
+## v1.0.0-rc.5
+### Fixed
+* Fixes long standing bug with console output not properly sending back to the client with server stats in certain edge case scenarios. This was "fixed" in `rc.4` but ended up breaking many servers in significantly more painful manners, but did allow us to better track down the issue.
+* Fixes build flags during release process to correctly strip unnessary code allowing the final binary size to be reduced back down to `~5MB`
+* Fixes Wings returning the last `16384` lines of the log file when connecting to the websocket.
+* Fixes pre-boot actions always running for a server start event even if the server is already running.
+
+### Added
+* Adds support for configuring the amount of time that can elapse between server disk size checking before the value is considered stale.
+
+## v1.0.0-rc.4
+### Fixed
+* Fixes server files being inaccessible if the root data path is a symlink to another location on the machine.
+* Fixes some console output being written to the logs accidentally truncating other lines due to special ANSI sequences being output.
+* Fixes `server.properties` files getting mangled by the automatic configuration editor when booting a server.
+* Fixes a missed stream close when stopping resource polling that would lead to memory leaks.
+* Fixes port bindings being incorrectly re-assigned when using `127.0.0.1` with Docker. These are now properly re-mapped to the `pterodactyl0` interface so that networking operates as expected for the server.
+* Fixes handling of values within arrays in `yaml` and `json` configuration files.
+* Fixes a 304 error being returned rather than a 400 error when a file upload is invalid.
+* Fixes deadlocks and response delays when processing server console and stat events. This was causing server consoles to become completely unresponsive after random periods of time and was only resolvable via a Wings restart.
+
+### Changed
+* Allows a stale value to be present when starting a server if the server is allowed an unlimited amount of disk space.
+* Removed all remaining traces of the `zap` logging library from the codebase.
+* Servers no longer auto-restart as if they crashed when a stop command is manually sent via the server console to the instance.
+* Changes the CORS checks to allow `*` as a remote origin.
+
+### Added
+* Added an auto-generated logrotate file which is written to the normal logrotate directory when wings is first started.
+* Added additional debug logging within the internals of the resource polling for servers to better trace unexpected behavior.
+* Adds additional logic check to avoid even trying to stop a suspended server if it is already stopped.
+
+## v1.0.0-rc.3
+### Fixed
+* Errors during the backup process are now correctly reported to the Panel and logged into the output correctly.
+* Empty directories are no longer pushed into the backup file list (which was causing errors to occur previously).
+* Covered an edge case to prevent errors if a file gets deleted while a backup is in progress.
+* Fixed a bug causing Wings to panic and crash if an invalid environment variable value was passed through. These invalid values are now logged to the output to better detect and an empty string is returned in their place.
+* Fixed startup variables and other server information not properly being updated when a server is restarted.
+* Suspension state of a server is now properly returned by the API.
+* Fixes an error being thrown if a backup does not exist on the local machine. A 404 is now properly returned and handled by the Panel when this occurs.
+* Fixes an error when attempting to move or rename a folder due to the target being created accidentally before the rename occurred.
+* Fixes install scripts running even when the checkbox to not run them on installation was selected in the Panel.
+
+### Changed
+* Disk space checking modified to not block in as many parts of the codebase and allow returning a stale cache value where that is appropriate. Thanks @cyberkitsune!
+* SFTP package code is now merged into the codebase to make keeping up with all of the code simpler, and reduce the complexity of the SFTP server.
+
+### Added
+* Added the ability for a node to be configured to skip file permissions checking when starting a server.
+* Added console output message to indicate that server disk space checking is occurring rather than silently sitting there.
+
+## v1.0.0-rc.2
+### Fixed
+* Fixes significant performance degradation due to excessive `syscall` actions when determining directory sizes on large servers. This was previously causing CPU & I/O lockups on servers and should be significantly more performant and less impactful on the system now.
+* Fixes panic crash when booting wings with no log directory created.
+
+### Changed
+* Changed default interval for disk space calculation from every 60 seconds to every 2.5 minutes.
+
+## v1.0.0-rc.1
+### Fixed
+* Servers are no longer incorrectly marked as stopping when they are, in fact, offline.
+* Release build version is now correctly output when starting wings.
+* Termination signals can now always be sent to a server instance even if the instance is currently starting/stopping.
+* Removed the file chown on wings boot to avoid slowing down the boot process unnecessarily when working with hundreds of servers on a node.
+* Fixed a multitude of race conditions throughout the code that cropped up during testing and made power handling even more robust for server instances.
+* In general multiple fragile areas of the codebase have been improved and are more likely to return useful errors should they break.
+* Addressed serious CPU usage issues when generating backups, and additionally decreased the amount of time they take to generate.
+
+### Changed
+* Internal server now uses more secure and recommended TLS settings.
+* Environment handling is now completely separate from the server package itself, allowing the environments to no longer be tightly coupled to the server.
+* `/tmp` directory mounted into containers can now be programmatically managed and uses better defaults to avoid people even needing to edit it.
+
+### Added
+* Wings logs are now properly persisted to the disk.
+* Adds the ability for an egg to use ANSI-stripped matching when determining if a server is done booting.
+
+## v1.0.0-beta.9
+### Fixed
+* Fixes server resource usage stats not being returned correctly by the API endpoint.
+* Fixes an exception thrown when attempting to write server installation logs.
+* Fixes error handling to provide a more accurate stack-trace in more scenarios where one is missing initially.
+* Fixes a memory leak and zombie event listeners when disconnecting from a server's websocket.
+* Fixes a race condition when wings is attempting to register/de-register event subscribers.
+* Server data directories now correctly have their permissions set recursively when booting Wings.
+* Fixes a race condition when a server's console stream was not fully closed before the next power action was started.
+
+### Changed
+* Server power handling is now handled in a synchronous manner. This avoids endless bugs and race conditions that would crop up if someone triggered two restart processes back to back. The new logic prevents performing any additional power actions until the currently executing action is completed.
+* Server disk usage is now correctly calculated when restarting the daemon as long as the server data directory exists.
+* Multiple code pathways within the boot process were cleaned up and modified to be less IO intensive and overall easier to reason about as a developer.
+* Additional timezone data is now mounted into containers to better improve the ability for instances running to be using the correct timezone.
+
+### Added
+* Adds basic internal file upload endpoints (these are currently not exposed anywhere in the Panel).
+* Added additional process events for installation start and completion.
+* Additional CORS allowed origins for the websocket can now be defined in the configuration file.
+* Adds the ability to authenticate with a docker registry when pulling images.
+
+## v1.0.0-beta.8
+### Fixed
+* Server state is synced with the Panel before performing a reinstall to ensure that the latest information is used.
+* Wings no longer crashes when a non-string environment variable value is passed through.
+* SFTP server authentication no longer attempts to contact the Panel to validate credentials if the format is known to already be incorrect.
+* Some previously missing error stacks are now properly returned when encountered.
+* Renaming a file no longer triggers an error if the base path does not exist.
+* Disk space is now properly calculated for a server even if it is assigned unlimited space.
+* **[Security]** Prevent symlink files from unintentionally chmodding their target file when a server is booted when the target file resides outside the server data directory.
+* **[Security]** Cleans up multiple code pathways that may unintentionally allow a malicious user to impact files outside their home directory.
+* Fixes numerous race conditions during a server's boot process that may lead to unintended data states.
+* Fixes an error thrown when attempting to delete a file that points to a symlink outside the server data directory.
+* Deleting a symlink will no longer attempt to remove the source file, only the symlink itself.
+* Websocket no longer blocks when handling a long running process for a user.
+
+### Changed
+* Install log for servers is now more detailed and more useful for debugging what might be going wrong.
+* Certain file management API endpoints now support passing through multiple paths at once to make mass actions easier to perform.
+* Re-worked file walking implementation to not cause a server crash when working with very large directories, and avoid race conditions when recursively walking directories.
+* Server configuration structure re-worked to be more manageable in the code base and avoid additional race conditions and complexity while making on-the-fly changes to it.
+
+### Added
+* Support for configuring additional file mount points in a container via the Panel.
+* Support for automated SSL certificate generation when booting the Daemon.
+* Added wings diagnostics command.
+* New API endpoints to compress and decompress files on a server.
+
+## v1.0.0-beta.7
+### Fixed
+* Stacktraces are now displayed once in the error output, rather than twice when certain errors are encountered.
+* Additional errors that did not previously output a stack trace have been fixed to output.
+* Fixes a bug where server space available would be triggered when creating a new server from a remote configuration before that file location existed on the disk, leading to an error.
+* Fixes context timeouts while pulling server docker images. Time was upped from 10 seconds to 15 minutes.
+* Configuration file replacement values are now properly de-escaped when writing to the disk. `\/no\/more\/slashes`
+* `.properties` files are now saved correctly to the disk with newlines, rather than shoved on a single line.
+* `./wings configure` command can now properly save the configuration to the disk.
+* Custom SSL locations are no longer obliterated when making changes to the Node's configuration via the Panel.
+
+### Changed
+* Exclusive lock is now acquired when performing a server installation to avoid two install processes being triggered at the same time. This also allows an install to be properly canceled if the server is deleted before it is completed.
+
+## v1.0.0-beta.6
+### Fixed
+* Server status is no longer sent to all connected websocket clients when a new client connects to the socket.
+* Server disk usage is sent back over the socket when connecting.
+* Default configuration for the SFTP server is now properly returned to `on` rather than `off`
+* Server boot is no longer blocked if there is an error fetching the Docker image as long as that image exists on the host.
+* The websocket no longer gets locked up when Wings attempts to send an error to the client.
+* Fixed a crash loop when an error is thrown during pre-boot phase of server startup.
+* Errors with `BindJSON` in API endpoints are now properly handled and returned.
+* Fixed warning about Gin running in non-release mode, even when the binary is running in release mode.
+
+### Changed
+* Switched logging libraries to output data in a clearer format more suited to the CLI where this application runs.
+* Cleaner debug messaging in debug mode from the router.
+
+## v1.0.0-beta.5
+### Fixed
+* Default config location settled on `/etc/pterodactyl/config.yml`; wings will now check all of the previous locations for the configuration and move it automatically to the new location.
+* Deleting a server no longer fails the process if the container cannot be found.
+* Fixes permissions checking for subusers connecting to the SFTP instance.
+* S3 backups now properly send back hash data to the panel.
+* Server installation containers are now always deleted, even if the installer process fails for the instance.
+* Files and folders with special characters and spaces in them no longer return a 404 error.
+* Servers using eggs with bad configurations will no longer cause the daemon to fail booting; these bad configurations are simply skipped over and a warning is emitted into the logs.
+* Environment variables passed to containers no longer contain improper quotes around them.
+* Matching on array indexes in configurations now works correctly; `foo[0]` is quietly transformed into the proper `foo.0` syntax.
+
+### Added
+* New banner error message when the daemon is unable to locate the configuration file. This should better clarify what the user needs to do in order to resolve the issue.
+* Adds ability to configure the default networking driver used by docker.
+
+## v1.0.0-beta.4
+### Fixed
+* Fixes unexpected nil-pointer panic when attempting to start some newly created servers, or any server that was missing a container on the system.
+* Fixes memory usage of process being reported differently than the `docker stats` output leading to some confusion. These numbers should be more correct now.
+* Fixes possible nil-pointer panic when detecting a deleted container as being crashed.
+
 ## v1.0.0-beta.3
 ### Fixed
 * Daemon will no longer crash if someone requests a websocket for a deleted server.
@@ -11,6 +342,39 @@
 ### Changed
 * Memory overhead for containers is now 5/10/15% higher than the passed limit to account for JVM heap and prevent crashing.
 
+## v1.0.0-beta.2
+### Changed
+* Backup functionality made significantly more modular to ease adding additional methods in the future.
+* Websocket permissions changed to use same name as in panel.
+* Container memory hard-limits are now adjusted up by 15% (< 2G memory), 10% (< 4G memory), or 5% to avoid unexpected OOM crashes for memory heavy games.
+* Wings executable is now 80% smaller thanks to better compilation arguments.
+
+### Added
+* Adds support for ignoring files and directories when generating a new backup.
+* Added internal directory walker with callback-continue support.
+
+### Fixed
+* Fixed linux distro matching when booting the daemon.
+* Fixes DNS to be configurable for docker containers that are made for servers.
+* Fixes incorrect file truncation when making modifications to a server's configuration files.
+
+## v1.0.0-beta.1
+### Added
+* Added support for passing specific threads to the docker environment when running a server.
+* Added support for reinstalling an existing server.
+* Added support for restarting a server.
+* Adds support for transferring servers between daemon instances.
+* Added auto-deploy command to fetch configuration from Panel automatically.
+
+### Changed
+* Server file and backup downloads now hit a direct endpoint with a one-time JWT to avoid proxying large downloads through the panel.
+
+### Fixed
+* Fixes a go routine causing a memory and CPU leak.
+* Fixed improper chown of server directories on boot.
+* Miscellaneous fixes to CPU usage, abandoned go-routines, and race conditions.
+* Fixes support for Alpine based systems.
+
 ## v1.0.0-alpha.2
 ### Added
 * Ability to run an installation process for a server and notify the panel when completed.
@@ -20,4 +384,4 @@
 * Fixed bugs caused when unmarshaling data into a struct with default values.
 * Timezone is properly set in containers by using the `TZ=` environment variable rather than mounting timezone data into the filesystem.
 * Server data directly is now properly created when running the install process.
-* Time drift caused in the socket JWT is now handled in a better manner and less likely to unexpectedly error out.
+* Time drift caused in the socket JWT is now handled in a better manner and less likely to unexpectedly error out.

Dockerfile

@@ -1,14 +1,33 @@
-# ----------------------------------
-# Pterodactyl Panel Dockerfile
-# ----------------------------------
+# Stage 1 (Build)
+FROM        golang:1.15-alpine3.12 AS builder
 
-FROM golang:1.14-alpine
-COPY . /go/wings/
-WORKDIR /go/wings/
-RUN apk add --no-cache upx \
- && go build -ldflags="-s -w" \
- && upx --brute wings
+ARG         VERSION
 
-FROM alpine:latest
-COPY --from=0 /go/wings/wings /usr/bin/
-CMD ["wings","--config", "/var/lib/pterodactyl/config.yml"]
+RUN         apk add --update --no-cache git=2.26.2-r0 make=4.3-r0 upx=3.96-r0
+
+WORKDIR     /app/
+
+COPY        go.mod go.sum /app/
+RUN         go mod download
+
+COPY        . /app/
+
+RUN         CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
+                -ldflags="-s -w -X github.com/pterodactyl/wings/system.Version=$VERSION" \
+                -v \
+                -trimpath \
+                -o wings \
+                wings.go
+
+RUN         upx wings
+
+# --------------------------------------- #
+
+# Stage 2 (Final)
+FROM        busybox:1.33.0
+
+RUN         echo "ID=\"busybox\"" > /etc/os-release
+
+COPY        --from=builder /app/wings /usr/bin/
+
+CMD         [ "wings", "--config", "/etc/pterodactyl/config.yml" ]

Makefile

@@ -1,28 +1,17 @@
-BINARY = "build/wings"
-OSARCHLIST = "darwin/386 darwin/amd64 linux/386 linux/amd64 linux/arm linux/arm64 windows/386 windows/amd64"
+build:
+	GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -gcflags "all=-trimpath=$(pwd)" -o build/wings_linux_amd64 -v wings.go
+	GOOS=linux GOARCH=arm64 go build -ldflags="-s -w" -gcflags "all=-trimpath=$(pwd)" -o build/wings_linux_arm64 -v wings.go
 
-all: $(BINARY)
+debug:
+	go build -race
+	./wings --debug --ignore-certificate-errors --config config.yml
 
-$(BINARY):
-	go build -o $(BINARY)
+compress:
+	upx --brute build/wings_*
 
-cross-build:
-	gox -osarch $(OSARCHLIST) -output "build/{{.Dir}}_{{.OS}}_{{.Arch}}"
+cross-build: clean build compress
 
-.PHONY: install
-install:
-	go install
+clean:
+	rm -rf build/wings_*
 
-test:
-	go test `go list ./... | grep -v "/vendor/"`
-
-coverage:
-	goverage -coverprofile=coverage.out ./...
-	go tool cover -html=coverage.out
-
-dependencies:
-	glide install
-
-install-tools:
-	go get -u github.com/mitchellh/gox
-	go get -u github.com/haya14busa/goverage
+.PHONY: all build compress clean

README.md

@@ -1,16 +1,40 @@
-# Alpha Project
-Please refrain from opening PRs or Issues at this time. This project is still under heavy development, and until we have a solid foundation and plan for how everything will connect, we will not be accepting PRs or feature suggestions.
+[![Logo Image](https://cdn.pterodactyl.io/logos/new/pterodactyl_logo.png)](https://pterodactyl.io)
 
-# Pterodactyl wings [![travis](https://img.shields.io/travis/pterodactyl/wings.svg?style=flat-square)](https://travis-ci.org/pterodactyl/wings) [![codacy quality](https://img.shields.io/codacy/grade/27a1576bda86450f853b1052b12fa570.svg?style=flat-square)](https://www.codacy.com/app/schrej/wings/dashboard) [![codacy coverage](https://img.shields.io/codacy/coverage/27a1576bda86450f853b1052b12fa570.svg?style=flat-square)](https://www.codacy.com/app/schrej/wings/files)
+![Discord](https://img.shields.io/discord/122900397965705216?label=Discord&logo=Discord&logoColor=white)
+![GitHub Releases](https://img.shields.io/github/downloads/pterodactyl/wings/latest/total)
+[![Go Report Card](https://goreportcard.com/badge/github.com/pterodactyl/wings)](https://goreportcard.com/report/github.com/pterodactyl/wings)
 
-```
-                     ____
-__ Pterodactyl _____/___/_______ _______ ______
-\_____\    \/\/    /   /       /  __   /   ___/
-   \___\          /   /   /   /  /_/  /___   /
-        \___/\___/___/___/___/___    /______/
-                            /_______/ alpha
-```
+# Pterodactyl Wings
+Wings is Pterodactyl's server control plane, built for the rapidly changing gaming industry and designed to be
+highly performant and secure. Wings provides an HTTP API allowing you to interface directly with running server
+instances, fetch server logs, generate backups, and control all aspects of the server lifecycle.
 
-A new generation of the Pterodactyl daemon, written in go.
+In addition, Wings ships with a built-in SFTP server allowing your system to remain free of Pterodactyl specific
+dependencies, and allowing users to authenticate with the same credentials they would normally use to access the Panel.
 
+## Sponsors
+I would like to extend my sincere thanks to the following sponsors for helping find Pterodactyl's developement.
+[Interested in becoming a sponsor?](https://github.com/sponsors/DaneEveritt)
+
+| Company | About |
+| ------- | ----- |
+| [**WISP**](https://wisp.gg) | Extra features. |
+| [**Bloom.host**](https://bloom.host) | Bloom.host offers dedicated core VPS and Minecraft hosting with Ryzen 9 processors. With owned-hardware, we offer truly unbeatable prices on high-performance hosting. |
+| [**MineStrator**](https://minestrator.com/) | Looking for a French highend hosting company for you minecraft server? More than 14,000 members on our discord, trust us. |
+| [**DedicatedMC**](https://dedicatedmc.io/) | DedicatedMC provides Raw Power hosting at affordable pricing, making sure to never compromise on your performance and giving you the best performance money can buy. |
+| [**Skynode**](https://www.skynode.pro/) | Skynode provides blazing fast game servers along with a top-notch user experience. Whatever our clients are looking for, we're able to provide it! |
+| [**XCORE**](https://xcore-server.de/) | XCORE offers High-End Servers for hosting and gaming since 2012. Fast, excellent and well-known for eSports Gaming. |
+| [**RoyaleHosting**](https://royalehosting.net/) |  Build your dreams and deploy them with RoyaleHosting’s reliable servers and network. Easy to use, provisioned in a couple of minutes. |
+| [**Spill Hosting**](https://spillhosting.no/) |  Spill Hosting is a Norwegian hosting service, which aims to cheap services on quality servers. Premium i9-9900K processors will run your game like a dream. |
+| [**DeinServerHost**](https://deinserverhost.de/) |  DeinServerHost offers Dedicated, vps and Gameservers for many popular Games like Minecraft and Rust in Germany since 2013. |
+
+## Documentation
+* [Panel Documentation](https://pterodactyl.io/panel/1.0/getting_started.html)
+* [Wings Documentation](https://pterodactyl.io/wings/1.0/installing.html)
+* [Community Guides](https://pterodactyl.io/community/about.html)
+* Or, get additional help [via Discord](https://discord.gg/pterodactyl)
+
+## Reporting Issues
+Please use the [pterodactyl/panel](https://github.com/pterodactyl/panel) repository to report any issues or make
+feature requests for Wings. In addition, the [security policy](https://github.com/pterodactyl/panel/security/policy) listed
+within that repository also applies to Wings.

api/api.go

@@ -2,11 +2,13 @@ package api
 
 import (
 	"bytes"
+	"emperror.dev/errors"
 	"encoding/json"
 	"fmt"
-	"github.com/pkg/errors"
+	"github.com/apex/log"
 	"github.com/pterodactyl/wings/config"
-	"go.uber.org/zap"
+	"github.com/pterodactyl/wings/system"
+	"io"
 	"io/ioutil"
 	"net/http"
 	"strings"
@@ -14,30 +16,47 @@ import (
 )
 
 // Initializes the requester instance.
-func NewRequester() *PanelRequest {
-	return &PanelRequest{
-		Response: nil,
-	}
+func New() *Request {
+	return &Request{}
 }
 
-type PanelRequest struct {
-	Response *http.Response
+// A generic type allowing for easy binding use when making requests to API endpoints
+// that only expect a singular argument or something that would not benefit from being
+// a typed struct.
+//
+// Inspired by gin.H, same concept.
+type D map[string]interface{}
+
+// Same concept as D, but a map of strings, used for querying GET requests.
+type Q map[string]string
+
+// A custom API requester struct for Wings.
+type Request struct{}
+
+// A custom response type that allows for commonly used error handling and response
+// parsing from the Panel API. This just embeds the normal HTTP response from Go and
+// we attach a few helper functions to it.
+type Response struct {
+	*http.Response
+}
+
+// A pagination struct matching the expected pagination response from the Panel API.
+type Pagination struct {
+	CurrentPage uint `json:"current_page"`
+	From        uint `json:"from"`
+	LastPage    uint `json:"last_page"`
+	PerPage     uint `json:"per_page"`
+	To          uint `json:"to"`
+	Total       uint `json:"total"`
 }
 
 // Builds the base request instance that can be used with the HTTP client.
-func (r *PanelRequest) GetClient() *http.Client {
-	return &http.Client{Timeout: time.Second * 30}
+func (r *Request) Client() *http.Client {
+	return &http.Client{Timeout: time.Second * time.Duration(config.Get().RemoteQuery.Timeout)}
 }
 
-func (r *PanelRequest) SetHeaders(req *http.Request) *http.Request {
-	req.Header.Set("Accept", "application/vnd.pterodactyl.v1+json")
-	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s.%s", config.Get().AuthenticationTokenId, config.Get().AuthenticationToken))
-
-	return req
-}
-
-func (r *PanelRequest) GetEndpoint(endpoint string) string {
+// Returns the given endpoint formatted as a URL to the Panel API.
+func (r *Request) Endpoint(endpoint string) string {
 	return fmt.Sprintf(
 		"%s/api/remote/%s",
 		strings.TrimSuffix(config.Get().PanelLocation, "/"),
@@ -45,49 +64,90 @@ func (r *PanelRequest) GetEndpoint(endpoint string) string {
 	)
 }
 
-func (r *PanelRequest) Get(url string) (*http.Response, error) {
-	c := r.GetClient()
-
-	req, err := http.NewRequest(http.MethodGet, r.GetEndpoint(url), nil)
-	req = r.SetHeaders(req)
-
+// Makes a HTTP request to the given endpoint, attaching the necessary request headers from
+// Wings to ensure that the request is properly handled by the Panel.
+func (r *Request) Make(method, url string, body io.Reader, opts ...func(r *http.Request)) (*Response, error) {
+	req, err := http.NewRequest(method, url, body)
 	if err != nil {
 		return nil, err
 	}
 
-	zap.S().Debugw("GET request to endpoint", zap.String("endpoint", r.GetEndpoint(url)), zap.Any("headers", req.Header))
+	req.Header.Set("User-Agent", fmt.Sprintf("Pterodactyl Wings/v%s (id:%s)", system.Version, config.Get().AuthenticationTokenId))
+	req.Header.Set("Accept", "application/vnd.pterodactyl.v1+json")
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s.%s", config.Get().AuthenticationTokenId, config.Get().AuthenticationToken))
 
-	return c.Do(req)
+	// Make any options calls that will allow us to make modifications to the request
+	// before it is sent off.
+	for _, cb := range opts {
+		cb(req)
+	}
+
+	r.debug(req)
+
+	res, err := r.Client().Do(req)
+
+	return &Response{Response: res}, err
 }
 
-func (r *PanelRequest) Post(url string, data []byte) (*http.Response, error) {
-	c := r.GetClient()
+// Logs the request into the debug log with all of the important request bits.
+// The authorization key will be cleaned up before being output.
+func (r *Request) debug(req *http.Request) {
+	headers := make(map[string][]string)
+	for k, v := range req.Header {
+		if k != "Authorization" || len(v) == 0 {
+			headers[k] = v
+			continue
+		}
 
-	req, err := http.NewRequest(http.MethodPost, r.GetEndpoint(url), bytes.NewBuffer(data))
-	req = r.SetHeaders(req)
+		headers[k] = []string{v[0][0:15] + "(redacted)"}
+	}
 
+	log.WithFields(log.Fields{
+		"method":   req.Method,
+		"endpoint": req.URL.String(),
+		"headers":  headers,
+	}).Debug("making request to external HTTP endpoint")
+}
+
+// Makes a GET request to the given Panel API endpoint. If any data is passed as the
+// second argument it will be passed through on the request as URL parameters.
+func (r *Request) Get(url string, data Q) (*Response, error) {
+	return r.Make(http.MethodGet, r.Endpoint(url), nil, func(r *http.Request) {
+		q := r.URL.Query()
+		for k, v := range data {
+			q.Set(k, v)
+		}
+
+		r.URL.RawQuery = q.Encode()
+	})
+}
+
+// Makes a POST request to the given Panel API endpoint.
+func (r *Request) Post(url string, data interface{}) (*Response, error) {
+	b, err := json.Marshal(data)
 	if err != nil {
 		return nil, err
 	}
 
-	zap.S().Debugw("POST request to endpoint", zap.String("endpoint", r.GetEndpoint(url)), zap.Any("headers", req.Header))
-
-	return c.Do(req)
+	return r.Make(http.MethodPost, r.Endpoint(url), bytes.NewBuffer(b))
 }
 
 // Determines if the API call encountered an error. If no request has been made
-// the response will be false.
-func (r *PanelRequest) HasError() bool {
+// the response will be false. This function will evaluate to true if the response
+// code is anything 300 or higher.
+func (r *Response) HasError() bool {
 	if r.Response == nil {
 		return false
 	}
 
-	return r.Response.StatusCode >= 300 || r.Response.StatusCode < 200
+	return r.StatusCode >= 300 || r.StatusCode < 200
 }
 
 // Reads the body from the response and returns it, then replaces it on the response
-// so that it can be read again later.
-func (r *PanelRequest) ReadBody() ([]byte, error) {
+// so that it can be read again later. This does not close the response body, so any
+// functions calling this should be sure to manually defer a Body.Close() call.
+func (r *Response) Read() ([]byte, error) {
 	var b []byte
 	if r.Response == nil {
 		return nil, errors.New("no response exists on interface")
@@ -102,42 +162,35 @@ func (r *PanelRequest) ReadBody() ([]byte, error) {
 	return b, nil
 }
 
-func (r *PanelRequest) HttpResponseCode() int {
-	if r.Response == nil {
-		return 0
+// Binds a given interface with the data returned in the response. This is a shortcut
+// for calling Read and then manually calling json.Unmarshal on the raw bytes.
+func (r *Response) Bind(v interface{}) error {
+	b, err := r.Read()
+	if err != nil {
+		return err
 	}
 
-	return r.Response.StatusCode
-}
-
-type RequestError struct {
-	Code   string `json:"code"`
-	Status string `json:"status"`
-	Detail string `json:"detail"`
-}
-
-// Returns the error response in a string form that can be more easily consumed.
-func (re *RequestError) String() string {
-	return fmt.Sprintf("%s: %s (HTTP/%s)", re.Code, re.Detail, re.Status)
-}
-
-type RequestErrorBag struct {
-	Errors []RequestError `json:"errors"`
+	return json.Unmarshal(b, &v)
 }
 
 // Returns the error message from the API call as a string. The error message will be formatted
 // similar to the below example:
 //
 // HttpNotFoundException: The requested resource does not exist. (HTTP/404)
-func (r *PanelRequest) Error() *RequestError {
-	body, _ := r.ReadBody()
-
-	bag := RequestErrorBag{}
-	json.Unmarshal(body, &bag)
-
-	if len(bag.Errors) == 0 {
-		return new(RequestError)
+func (r *Response) Error() error {
+	if !r.HasError() {
+		return nil
 	}
 
-	return &bag.Errors[0]
+	var bag RequestErrorBag
+	_ = r.Bind(&bag)
+
+	e := &RequestError{}
+	if len(bag.Errors) > 0 {
+		e = &bag.Errors[0]
+	}
+
+	e.response = r.Response
+
+	return e
 }

api/backup_endpoints.go

@@ -1,35 +1,49 @@
 package api
 
 import (
-	"encoding/json"
 	"fmt"
-	"github.com/pkg/errors"
+	"strconv"
 )
 
+type BackupRemoteUploadResponse struct {
+	Parts    []string `json:"parts"`
+	PartSize int64    `json:"part_size"`
+}
+
+func (r *Request) GetBackupRemoteUploadURLs(backup string, size int64) (*BackupRemoteUploadResponse, error) {
+	resp, err := r.Get(fmt.Sprintf("/backups/%s", backup), Q{"size": strconv.FormatInt(size, 10)})
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.HasError() {
+		return nil, resp.Error()
+	}
+
+	var res BackupRemoteUploadResponse
+	if err := resp.Bind(&res); err != nil {
+		return nil, err
+	}
+
+	return &res, nil
+}
+
 type BackupRequest struct {
-	Checksum string `json:"checksum"`
-	Size     int64  `json:"size"`
-	Successful bool `json:"successful"`
+	Checksum     string `json:"checksum"`
+	ChecksumType string `json:"checksum_type"`
+	Size         int64  `json:"size"`
+	Successful   bool   `json:"successful"`
 }
 
 // Notifies the panel that a specific backup has been completed and is now
 // available for a user to view and download.
-func (r *PanelRequest) SendBackupStatus(backup string, data BackupRequest) (*RequestError, error) {
-	b, err := json.Marshal(data)
+func (r *Request) SendBackupStatus(backup string, data BackupRequest) error {
+	resp, err := r.Post(fmt.Sprintf("/backups/%s", backup), data)
 	if err != nil {
-		return nil, errors.WithStack(err)
-	}
-
-	resp, err := r.Post(fmt.Sprintf("/backups/%s", backup), b)
-	if err != nil {
-		return nil, errors.WithStack(err)
+		return err
 	}
 	defer resp.Body.Close()
 
-	r.Response = resp
-	if r.HasError() {
-		return r.Error(), nil
-	}
-
-	return nil, nil
+	return resp.Error()
 }

api/error.go

@@ -0,0 +1,33 @@
+package api
+
+import (
+	"fmt"
+	"net/http"
+)
+
+type RequestErrorBag struct {
+	Errors []RequestError `json:"errors"`
+}
+
+type RequestError struct {
+	response *http.Response
+	Code     string `json:"code"`
+	Status   string `json:"status"`
+	Detail   string `json:"detail"`
+}
+
+func IsRequestError(err error) bool {
+	_, ok := err.(*RequestError)
+
+	return ok
+}
+
+// Returns the error response in a string form that can be more easily consumed.
+func (re *RequestError) Error() string {
+	c := 0
+	if re.response != nil {
+		c = re.response.StatusCode
+	}
+
+	return fmt.Sprintf("Error response from Panel: %s: %s (HTTP/%d)", re.Code, re.Detail, c)
+}

api/process_configuration.go

@@ -0,0 +1,68 @@
+package api
+
+import (
+	"encoding/json"
+	"github.com/apex/log"
+	"github.com/pterodactyl/wings/parser"
+	"regexp"
+	"strings"
+)
+
+type OutputLineMatcher struct {
+	// The raw string to match against. This may or may not be prefixed with
+	// regex: which indicates we want to match against the regex expression.
+	raw string
+	reg *regexp.Regexp
+}
+
+// Determine if a given string "s" matches the given line.
+func (olm *OutputLineMatcher) Matches(s string) bool {
+	if olm.reg == nil {
+		return strings.Contains(s, olm.raw)
+	}
+
+	return olm.reg.MatchString(s)
+}
+
+// Return the matcher's raw comparison string.
+func (olm *OutputLineMatcher) String() string {
+	return olm.raw
+}
+
+// Unmarshal the startup lines into individual structs for easier matching abilities.
+func (olm *OutputLineMatcher) UnmarshalJSON(data []byte) error {
+	if err := json.Unmarshal(data, &olm.raw); err != nil {
+		return err
+	}
+
+	if strings.HasPrefix(olm.raw, "regex:") && len(olm.raw) > 6 {
+		r, err := regexp.Compile(strings.TrimPrefix(olm.raw, "regex:"))
+		if err != nil {
+			log.WithField("error", err).WithField("raw", olm.raw).Warn("failed to compile output line marked as being regex")
+		}
+
+		olm.reg = r
+	}
+
+	return nil
+}
+
+type ProcessStopConfiguration struct {
+	Type  string `json:"type"`
+	Value string `json:"value"`
+}
+
+// Defines the process configuration for a given server instance. This sets what the
+// daemon is looking for to mark a server as done starting, what to do when stopping,
+// and what changes to make to the configuration file for a server.
+type ProcessConfiguration struct {
+	Startup struct {
+		Done            []*OutputLineMatcher `json:"done"`
+		UserInteraction []string             `json:"user_interaction"`
+		StripAnsi       bool                 `json:"strip_ansi"`
+	} `json:"startup"`
+
+	Stop ProcessStopConfiguration `json:"stop"`
+
+	ConfigurationFiles []parser.ConfigurationFile `json:"configs"`
+}

api/server_endpoints.go

@@ -1,10 +1,14 @@
 package api
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
-	"github.com/pkg/errors"
-	"github.com/pterodactyl/wings/parser"
+	"github.com/apex/log"
+	"github.com/pterodactyl/wings/config"
+	"golang.org/x/sync/errgroup"
+	"strconv"
+	"sync"
 )
 
 const (
@@ -26,21 +30,6 @@ type ServerConfigurationResponse struct {
 	ProcessConfiguration *ProcessConfiguration `json:"process_configuration"`
 }
 
-// Defines the process configuration for a given server instance. This sets what the
-// daemon is looking for to mark a server as done starting, what to do when stopping,
-// and what changes to make to the configuration file for a server.
-type ProcessConfiguration struct {
-	Startup struct {
-		Done            string   `json:"done"`
-		UserInteraction []string `json:"userInteraction"`
-	} `json:"startup"`
-	Stop struct {
-		Type  string `json:"type"`
-		Value string `json:"value"`
-	} `json:"stop"`
-	ConfigurationFiles []parser.ConfigurationFile `json:"configs"`
-}
-
 // Defines installation script information for a server process. This is used when
 // a server is installed for the first time, and when a server is marked for re-installation.
 type InstallationScript struct {
@@ -49,157 +38,166 @@ type InstallationScript struct {
 	Script         string `json:"script"`
 }
 
-// GetAllServerConfigurations fetches configurations for all servers assigned to this node.
-func (r *PanelRequest) GetAllServerConfigurations() (map[string]*ServerConfigurationResponse, *RequestError, error) {
-	resp, err := r.Get("/servers")
+type allServerResponse struct {
+	Data []RawServerData `json:"data"`
+	Meta Pagination      `json:"meta"`
+}
+
+type RawServerData struct {
+	Uuid                 string          `json:"uuid"`
+	Settings             json.RawMessage `json:"settings"`
+	ProcessConfiguration json.RawMessage `json:"process_configuration"`
+}
+
+// Fetches all of the server configurations from the Panel API. This will initially load the
+// first 50 servers, and then check the pagination response to determine if more pages should
+// be loaded. If so, those requests are spun-up in additional routines and the final resulting
+// slice of all servers will be returned.
+func (r *Request) GetServers() ([]RawServerData, error) {
+	resp, err := r.Get("/servers", Q{"per_page": strconv.Itoa(int(config.Get().RemoteQuery.BootServersPerPage))})
 	if err != nil {
-		return nil, nil, errors.WithStack(err)
+		return nil, err
 	}
 	defer resp.Body.Close()
 
-	r.Response = resp
-
-	if r.HasError() {
-		return nil, r.Error(), nil
+	if resp.HasError() {
+		return nil, resp.Error()
 	}
 
-	b, _ := r.ReadBody()
-	res := map[string]*ServerConfigurationResponse{}
-	if len(b) == 2 {
-		return res, nil, nil
+	var res allServerResponse
+	if err := resp.Bind(&res); err != nil {
+		return nil, err
 	}
 
-	if err := json.Unmarshal(b, &res); err != nil {
-		return nil, nil, errors.WithStack(err)
+	var mu sync.Mutex
+	ret := res.Data
+
+	// Check for pagination, and if it exists we'll need to then make a request to the API
+	// for each page that would exist and get all of the resulting servers.
+	if res.Meta.LastPage > 1 {
+		pp := res.Meta.PerPage
+		log.WithField("per_page", pp).
+			WithField("total_pages", res.Meta.LastPage).
+			Debug("detected multiple pages of server configurations, fetching remaining...")
+
+		g, ctx := errgroup.WithContext(context.Background())
+		for i := res.Meta.CurrentPage + 1; i <= res.Meta.LastPage; i++ {
+			page := strconv.Itoa(int(i))
+
+			g.Go(func() error {
+				select {
+				case <-ctx.Done():
+					return ctx.Err()
+				default:
+					{
+						resp, err := r.Get("/servers", Q{"page": page, "per_page": strconv.Itoa(int(pp))})
+						if err != nil {
+							return err
+						}
+						defer resp.Body.Close()
+
+						if resp.Error() != nil {
+							return resp.Error()
+						}
+
+						var servers allServerResponse
+						if err := resp.Bind(&servers); err != nil {
+							return err
+						}
+
+						mu.Lock()
+						defer mu.Unlock()
+						ret = append(ret, servers.Data...)
+
+						return nil
+					}
+				}
+			})
+		}
+
+		if err := g.Wait(); err != nil {
+			return nil, err
+		}
 	}
 
-	return res, nil, nil
+	return ret, nil
 }
 
 // Fetches the server configuration and returns the struct for it.
-func (r *PanelRequest) GetServerConfiguration(uuid string) (*ServerConfigurationResponse, *RequestError, error) {
-	resp, err := r.Get(fmt.Sprintf("/servers/%s", uuid))
+func (r *Request) GetServerConfiguration(uuid string) (ServerConfigurationResponse, error) {
+	var cfg ServerConfigurationResponse
+
+	resp, err := r.Get(fmt.Sprintf("/servers/%s", uuid), nil)
 	if err != nil {
-		return nil, nil, errors.WithStack(err)
+		return cfg, err
 	}
 	defer resp.Body.Close()
 
-	r.Response = resp
-
-	if r.HasError() {
-		return nil, r.Error(), nil
+	if resp.HasError() {
+		return cfg, resp.Error()
 	}
 
-	res := &ServerConfigurationResponse{}
-	b, _ := r.ReadBody()
-
-	if err := json.Unmarshal(b, res); err != nil {
-		return nil, nil, errors.WithStack(err)
+	if err := resp.Bind(&cfg); err != nil {
+		return cfg, err
 	}
 
-	return res, nil, nil
+	return cfg, nil
 }
 
 // Fetches installation information for the server process.
-func (r *PanelRequest) GetInstallationScript(uuid string) (InstallationScript, *RequestError, error) {
-	res := InstallationScript{}
-
-	resp, err := r.Get(fmt.Sprintf("/servers/%s/install", uuid))
+func (r *Request) GetInstallationScript(uuid string) (InstallationScript, error) {
+	var is InstallationScript
+	resp, err := r.Get(fmt.Sprintf("/servers/%s/install", uuid), nil)
 	if err != nil {
-		return res, nil, errors.WithStack(err)
+		return is, err
 	}
 	defer resp.Body.Close()
 
-	r.Response = resp
-
-	if r.HasError() {
-		return res, r.Error(), nil
+	if resp.HasError() {
+		return is, resp.Error()
 	}
 
-	b, _ := r.ReadBody()
-
-	if err := json.Unmarshal(b, &res); err != nil {
-		return res, nil, errors.WithStack(err)
+	if err := resp.Bind(&is); err != nil {
+		return is, err
 	}
 
-	return res, nil, nil
-}
-
-type installRequest struct {
-	Successful bool `json:"successful"`
+	return is, nil
 }
 
 // Marks a server as being installed successfully or unsuccessfully on the panel.
-func (r *PanelRequest) SendInstallationStatus(uuid string, successful bool) (*RequestError, error) {
-	b, err := json.Marshal(installRequest{Successful: successful})
+func (r *Request) SendInstallationStatus(uuid string, successful bool) error {
+	resp, err := r.Post(fmt.Sprintf("/servers/%s/install", uuid), D{"successful": successful})
 	if err != nil {
-		return nil, errors.WithStack(err)
-	}
-
-	resp, err := r.Post(fmt.Sprintf("/servers/%s/install", uuid), b)
-	if err != nil {
-		return nil, errors.WithStack(err)
+		return err
 	}
 	defer resp.Body.Close()
 
-	r.Response = resp
-	if r.HasError() {
-		return r.Error(), nil
+	if resp.HasError() {
+		return resp.Error()
 	}
 
-	return nil, nil
+	return nil
 }
 
-type archiveRequest struct {
-	Successful bool `json:"successful"`
-}
-
-func (r *PanelRequest) SendArchiveStatus(uuid string, successful bool) (*RequestError, error) {
-	b, err := json.Marshal(archiveRequest{Successful: successful})
+func (r *Request) SendArchiveStatus(uuid string, successful bool) error {
+	resp, err := r.Post(fmt.Sprintf("/servers/%s/archive", uuid), D{"successful": successful})
 	if err != nil {
-		return nil, errors.WithStack(err)
-	}
-
-	resp, err := r.Post(fmt.Sprintf("/servers/%s/archive", uuid), b)
-	if err != nil {
-		return nil, errors.WithStack(err)
+		return err
 	}
 	defer resp.Body.Close()
 
-	r.Response = resp
-	if r.HasError() {
-		return r.Error(), nil
-	}
-
-	return nil, nil
+	return resp.Error()
 }
 
-func (r *PanelRequest) SendTransferFailure(uuid string) (*RequestError, error) {
-	resp, err := r.Get(fmt.Sprintf("/servers/%s/transfer/failure", uuid))
+func (r *Request) SendTransferStatus(uuid string, successful bool) error {
+	state := "failure"
+	if successful {
+		state = "success"
+	}
+	resp, err := r.Get(fmt.Sprintf("/servers/%s/transfer/%s", uuid, state), nil)
 	if err != nil {
-		return nil, errors.WithStack(err)
+		return err
 	}
 	defer resp.Body.Close()
-
-	r.Response = resp
-	if r.HasError() {
-		return r.Error(), nil
-	}
-
-	return nil, nil
+	return resp.Error()
 }
-
-func (r *PanelRequest) SendTransferSuccess(uuid string) (*RequestError, error) {
-	resp, err := r.Get(fmt.Sprintf("/servers/%s/transfer/success", uuid))
-	if err != nil {
-		return nil, errors.WithStack(err)
-	}
-	defer resp.Body.Close()
-
-	r.Response = resp
-	if r.HasError() {
-		return r.Error(), nil
-	}
-
-	return nil, nil
-}

api/sftp_endpoints.go

@@ -1,45 +1,84 @@
 package api
 
 import (
-	"encoding/json"
-	"github.com/pkg/errors"
-	"github.com/pterodactyl/sftp-server"
-	"go.uber.org/zap"
+	"emperror.dev/errors"
+	"github.com/apex/log"
+	"regexp"
 )
 
-func (r *PanelRequest) ValidateSftpCredentials(request sftp_server.AuthenticationRequest) (*sftp_server.AuthenticationResponse, error) {
-	b, err := json.Marshal(request)
-	if err != nil {
-		return nil, err
+type SftpAuthRequest struct {
+	User          string `json:"username"`
+	Pass          string `json:"password"`
+	IP            string `json:"ip"`
+	SessionID     []byte `json:"session_id"`
+	ClientVersion []byte `json:"client_version"`
+}
+
+type SftpAuthResponse struct {
+	Server      string   `json:"server"`
+	Token       string   `json:"token"`
+	Permissions []string `json:"permissions"`
+}
+
+type sftpInvalidCredentialsError struct {
+}
+
+func (ice sftpInvalidCredentialsError) Error() string {
+	return "the credentials provided were invalid"
+}
+
+func IsInvalidCredentialsError(err error) bool {
+	_, ok := err.(*sftpInvalidCredentialsError)
+
+	return ok
+}
+
+// Usernames all follow the same format, so don't even bother hitting the API if the username is not
+// at least in the expected format. This is very basic protection against random bots finding the SFTP
+// server and sending a flood of usernames.
+var validUsernameRegexp = regexp.MustCompile(`^(?i)(.+)\.([a-z0-9]{8})$`)
+
+func (r *Request) ValidateSftpCredentials(request SftpAuthRequest) (*SftpAuthResponse, error) {
+	// If the username doesn't meet the expected format that the Panel would even recognize just go ahead
+	// and bail out of the process here to avoid accidentally brute forcing the panel if a bot decides
+	// to connect to spam username attempts.
+	if !validUsernameRegexp.MatchString(request.User) {
+		log.WithFields(log.Fields{
+			"subsystem": "sftp",
+			"username":  request.User,
+			"ip":        request.IP,
+		}).Warn("failed to validate user credentials (invalid format)")
+
+		return nil, new(sftpInvalidCredentialsError)
 	}
 
-	resp, err := r.Post("/sftp/auth", b)
+	resp, err := r.Post("/sftp/auth", request)
 	if err != nil {
 		return nil, err
 	}
 	defer resp.Body.Close()
 
-	r.Response = resp
+	e := resp.Error()
+	if e != nil {
+		if resp.StatusCode >= 400 && resp.StatusCode < 500 {
+			log.WithFields(log.Fields{
+				"subsystem": "sftp",
+				"username":  request.User,
+				"ip":        request.IP,
+			}).Warn(e.Error())
 
-	if r.HasError() {
-		if r.HttpResponseCode() >= 400 && r.HttpResponseCode() < 500 {
-			zap.S().Debugw("failed to validate server credentials for SFTP", zap.String("error", r.Error().String()))
-
-			return nil, new(sftp_server.InvalidCredentialsError)
+			return nil, &sftpInvalidCredentialsError{}
 		}
 
-		rerr := errors.New(r.Error().String())
-		zap.S().Warnw("error validating SFTP credentials", zap.Error(rerr))
+		rerr := errors.New(e.Error())
 
 		return nil, rerr
 	}
 
-	response := new(sftp_server.AuthenticationResponse)
-	body, _ := r.ReadBody()
-
-	if err := json.Unmarshal(body, response); err != nil {
+	var response SftpAuthResponse
+	if err := resp.Bind(&response); err != nil {
 		return nil, err
 	}
 
-	return response, nil
-}
+	return &response, nil
+}

cmd/config_finder.go

@@ -0,0 +1,60 @@
+package cmd
+
+import (
+	"github.com/pterodactyl/wings/config"
+	"os"
+	"path/filepath"
+)
+
+// We've gone through a couple of iterations of where the configuration is stored. This
+// helpful little function will look through the three areas it might have ended up, and
+// return it.
+//
+// We only run this if the configuration flag for the instance is not actually passed in
+// via the command line. Once found, the configuration is moved into the expected default
+// location. Only errors are returned from this function, you can safely assume that after
+// running this the configuration can be found in the correct default location.
+func RelocateConfiguration() error {
+	var match string
+	check := []string{
+		config.DefaultLocation,
+		"/var/lib/pterodactyl/config.yml",
+		"/etc/wings/config.yml",
+	}
+
+	// Loop over all of the configuration paths, and return which one we found, if
+	// any.
+	for _, p := range check {
+		if s, err := os.Stat(p); err != nil {
+			if !os.IsNotExist(err) {
+				return err
+			}
+		} else if !s.IsDir() {
+			match = p
+			break
+		}
+	}
+
+	// Just return a generic not exist error at this point if we didn't have a match, this
+	// will allow the caller to handle displaying a more friendly error to the user. If we
+	// did match in the default location, go ahead and return successfully.
+	if match == "" {
+		return os.ErrNotExist
+	} else if match == config.DefaultLocation {
+		return nil
+	}
+
+	// The rest of this function simply creates the new default location and moves the
+	// old configuration file over to the new location, then sets the permissions on the
+	// file correctly so that only the user running this process can read it.
+	p, _ := filepath.Split(config.DefaultLocation)
+	if err := os.MkdirAll(p, 0755); err != nil {
+		return err
+	}
+
+	if err := os.Rename(match, config.DefaultLocation); err != nil {
+		return err
+	}
+
+	return os.Chmod(config.DefaultLocation, 0600)
+}

cmd/configure.go

@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"github.com/AlecAivazis/survey/v2"
 	"github.com/AlecAivazis/survey/v2/terminal"
-	"github.com/creasty/defaults"
 	"github.com/pterodactyl/wings/config"
 	"github.com/spf13/cobra"
 	"io/ioutil"
@@ -147,8 +146,8 @@ func configureCmdRun(cmd *cobra.Command, args []string) {
 
 	b, err := ioutil.ReadAll(res.Body)
 
-	cfg := new(config.Configuration)
-	if err := defaults.Set(cfg); err != nil {
+	cfg, err := config.NewFromPath(configPath)
+	if err != nil {
 		panic(err)
 	}
 

cmd/diagnostics.go

@@ -0,0 +1,242 @@
+package cmd
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"github.com/pterodactyl/wings/environment"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"os/exec"
+	"path"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/AlecAivazis/survey/v2"
+	"github.com/AlecAivazis/survey/v2/terminal"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/pkg/parsers/kernel"
+	"github.com/docker/docker/pkg/parsers/operatingsystem"
+	"github.com/pterodactyl/wings/config"
+	"github.com/pterodactyl/wings/system"
+	"github.com/spf13/cobra"
+)
+
+const DefaultHastebinUrl = "https://ptero.co"
+const DefaultLogLines = 200
+
+var (
+	diagnosticsArgs struct {
+		IncludeEndpoints   bool
+		IncludeLogs        bool
+		ReviewBeforeUpload bool
+		HastebinURL        string
+		LogLines           int
+	}
+)
+
+var diagnosticsCmd = &cobra.Command{
+	Use:   "diagnostics",
+	Short: "Collect diagnostics information.",
+	Run:   diagnosticsCmdRun,
+}
+
+func init() {
+	diagnosticsCmd.PersistentFlags().StringVar(&diagnosticsArgs.HastebinURL, "hastebin-url", DefaultHastebinUrl, "The url of the hastebin instance to use.")
+	diagnosticsCmd.PersistentFlags().IntVar(&diagnosticsArgs.LogLines, "log-lines", DefaultLogLines, "The number of log lines to include in the report")
+}
+
+// diagnosticsCmdRun collects diagnostics about wings, it's configuration and the node.
+// We collect:
+// - wings and docker versions
+// - relevant parts of daemon configuration
+// - the docker debug output
+// - running docker containers
+// - logs
+func diagnosticsCmdRun(cmd *cobra.Command, args []string) {
+	questions := []*survey.Question{
+		{
+			Name:   "IncludeEndpoints",
+			Prompt: &survey.Confirm{Message: "Do you want to include endpoints (i.e. the FQDN/IP of your panel)?", Default: false},
+		},
+		{
+			Name:   "IncludeLogs",
+			Prompt: &survey.Confirm{Message: "Do you want to include the latest logs?", Default: true},
+		},
+		{
+			Name: "ReviewBeforeUpload",
+			Prompt: &survey.Confirm{
+				Message: "Do you want to review the collected data before uploading to hastebin.com?",
+				Help:    "The data, especially the logs, might contain sensitive information, so you should review it. You will be asked again if you want to upload.",
+				Default: true,
+			},
+		},
+	}
+	if err := survey.Ask(questions, &diagnosticsArgs); err != nil {
+		if err == terminal.InterruptErr {
+			return
+		}
+		panic(err)
+	}
+
+	dockerVersion, dockerInfo, dockerErr := getDockerInfo()
+	_ = dockerInfo
+
+	output := &strings.Builder{}
+	fmt.Fprintln(output, "Pterodactyl Wings - Diagnostics Report")
+	printHeader(output, "Versions")
+	fmt.Fprintln(output, "         wings:", system.Version)
+	if dockerErr == nil {
+		fmt.Fprintln(output, "Docker:", dockerVersion.Version)
+	}
+	if v, err := kernel.GetKernelVersion(); err == nil {
+		fmt.Fprintln(output, "Kernel:", v)
+	}
+	if os, err := operatingsystem.GetOperatingSystem(); err == nil {
+		fmt.Fprintln(output, "    OS:", os)
+	}
+
+	printHeader(output, "Wings Configuration")
+	cfg, err := config.ReadConfiguration(config.DefaultLocation)
+	if cfg != nil {
+		fmt.Fprintln(output, "    Panel Location:", redact(cfg.PanelLocation))
+		fmt.Fprintln(output, "")
+		fmt.Fprintln(output, " Internal Webserver:", redact(cfg.Api.Host), ":", cfg.Api.Port)
+		fmt.Fprintln(output, "        SSL Enabled:", cfg.Api.Ssl.Enabled)
+		fmt.Fprintln(output, "    SSL Certificate:", redact(cfg.Api.Ssl.CertificateFile))
+		fmt.Fprintln(output, "            SSL Key:", redact(cfg.Api.Ssl.KeyFile))
+		fmt.Fprintln(output, "")
+		fmt.Fprintln(output, "        SFTP Server:", redact(cfg.System.Sftp.Address), ":", cfg.System.Sftp.Port)
+		fmt.Fprintln(output, "     SFTP Read-Only:", cfg.System.Sftp.ReadOnly)
+		fmt.Fprintln(output, "")
+		fmt.Fprintln(output, "     Root Directory:", cfg.System.RootDirectory)
+		fmt.Fprintln(output, "     Logs Directory:", cfg.System.LogDirectory)
+		fmt.Fprintln(output, "     Data Directory:", cfg.System.Data)
+		fmt.Fprintln(output, "  Archive Directory:", cfg.System.ArchiveDirectory)
+		fmt.Fprintln(output, "   Backup Directory:", cfg.System.BackupDirectory)
+		fmt.Fprintln(output, "")
+		fmt.Fprintln(output, "           Username:", cfg.System.Username)
+		fmt.Fprintln(output, "        Server Time:", time.Now().Format(time.RFC1123Z))
+		fmt.Fprintln(output, "         Debug Mode:", cfg.Debug)
+	} else {
+		fmt.Println("Failed to load configuration.", err)
+	}
+
+	printHeader(output, "Docker: Info")
+	fmt.Fprintln(output, "Server Version:", dockerInfo.ServerVersion)
+	fmt.Fprintln(output, "Storage Driver:", dockerInfo.Driver)
+	if dockerInfo.DriverStatus != nil {
+		for _, pair := range dockerInfo.DriverStatus {
+			fmt.Fprintf(output, "  %s: %s\n", pair[0], pair[1])
+		}
+	}
+	if dockerInfo.SystemStatus != nil {
+		for _, pair := range dockerInfo.SystemStatus {
+			fmt.Fprintf(output, " %s: %s\n", pair[0], pair[1])
+		}
+	}
+	fmt.Fprintln(output, "LoggingDriver:", dockerInfo.LoggingDriver)
+	fmt.Fprintln(output, " CgroupDriver:", dockerInfo.CgroupDriver)
+	if len(dockerInfo.Warnings) > 0 {
+		for _, w := range dockerInfo.Warnings {
+			fmt.Fprintln(output, w)
+		}
+	}
+
+	printHeader(output, "Docker: Running Containers")
+	c := exec.Command("docker", "ps")
+	if co, err := c.Output(); err == nil {
+		output.Write(co)
+	} else {
+		fmt.Fprint(output, "Couldn't list containers: ", err)
+	}
+
+	printHeader(output, "Latest Wings Logs")
+	if diagnosticsArgs.IncludeLogs {
+		p := "/var/log/pterodactyl/wings.log"
+		if cfg != nil {
+			p = path.Join(cfg.System.LogDirectory, "wings.log")
+		}
+		if c, err := exec.Command("tail", "-n", strconv.Itoa(diagnosticsArgs.LogLines), p).Output(); err != nil {
+			fmt.Fprintln(output, "No logs found or an error occurred.")
+		} else {
+			fmt.Fprintf(output, "%s\n", string(c))
+		}
+	} else {
+		fmt.Fprintln(output, "Logs redacted.")
+	}
+
+	fmt.Println("\n---------------  generated report  ---------------")
+	fmt.Println(output.String())
+	fmt.Print("---------------   end of report    ---------------\n\n")
+
+	upload := !diagnosticsArgs.ReviewBeforeUpload
+	if !upload {
+		survey.AskOne(&survey.Confirm{Message: "Upload to " + diagnosticsArgs.HastebinURL + "?", Default: false}, &upload)
+	}
+	if upload {
+		url, err := uploadToHastebin(diagnosticsArgs.HastebinURL, output.String())
+		if err == nil {
+			fmt.Println("Your report is available here: ", url)
+		}
+	}
+}
+
+func getDockerInfo() (types.Version, types.Info, error) {
+	cli, err := environment.DockerClient()
+	if err != nil {
+		return types.Version{}, types.Info{}, err
+	}
+	dockerVersion, err := cli.ServerVersion(context.Background())
+	if err != nil {
+		return types.Version{}, types.Info{}, err
+	}
+	dockerInfo, err := cli.Info(context.Background())
+	if err != nil {
+		return types.Version{}, types.Info{}, err
+	}
+	return dockerVersion, dockerInfo, nil
+}
+
+func uploadToHastebin(hbUrl, content string) (string, error) {
+	r := strings.NewReader(content)
+	u, err := url.Parse(hbUrl)
+	if err != nil {
+		return "", err
+	}
+	u.Path = path.Join(u.Path, "documents")
+	res, err := http.Post(u.String(), "plain/text", r)
+	if err != nil || res.StatusCode != 200 {
+		fmt.Println("Failed to upload report to ", u.String(), err)
+		return "", err
+	}
+	pres := make(map[string]interface{})
+	body, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		fmt.Println("Failed to parse response.", err)
+		return "", err
+	}
+	json.Unmarshal(body, &pres)
+	if key, ok := pres["key"].(string); ok {
+		u, _ := url.Parse(hbUrl)
+		u.Path = path.Join(u.Path, key)
+		return u.String(), nil
+	}
+	return "", errors.New("failed to find key in response")
+}
+
+func redact(s string) string {
+	if !diagnosticsArgs.IncludeEndpoints {
+		return "{redacted}"
+	}
+	return s
+}
+
+func printHeader(w io.Writer, title string) {
+	fmt.Fprintln(w, "\n|\n|", title)
+	fmt.Fprintln(w, "| ------------------------------")
+}

cmd/root.go

@@ -2,47 +2,71 @@ package cmd
 
 import (
 	"crypto/tls"
+	"emperror.dev/errors"
 	"fmt"
-	"net/http"
-	"os"
-	"path"
-	"strings"
-
-	"github.com/pkg/errors"
+	"github.com/NYTimes/logrotate"
+	"github.com/apex/log"
+	"github.com/apex/log/handlers/multi"
+	"github.com/docker/docker/client"
+	"github.com/gammazero/workerpool"
+	"github.com/mitchellh/colorstring"
 	"github.com/pkg/profile"
 	"github.com/pterodactyl/wings/config"
 	"github.com/pterodactyl/wings/environment"
+	"github.com/pterodactyl/wings/loggers/cli"
 	"github.com/pterodactyl/wings/router"
 	"github.com/pterodactyl/wings/server"
 	"github.com/pterodactyl/wings/sftp"
 	"github.com/pterodactyl/wings/system"
-	"github.com/remeh/sizedwaitgroup"
 	"github.com/spf13/cobra"
-	"go.uber.org/zap"
+	"golang.org/x/crypto/acme"
+	"golang.org/x/crypto/acme/autocert"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
 )
 
-var configPath = config.DefaultLocation
-var debug = false
-var shouldRunProfiler = false
+var (
+	profiler                = ""
+	configPath              = config.DefaultLocation
+	debug                   = false
+	useAutomaticTls         = false
+	tlsHostname             = ""
+	showVersion             = false
+	ignoreCertificateErrors = false
+)
 
 var root = &cobra.Command{
 	Use:   "wings",
 	Short: "The wings of the pterodactyl game management panel",
 	Long:  ``,
-	Run:   rootCmdRun,
+	PreRun: func(cmd *cobra.Command, args []string) {
+		if useAutomaticTls && len(tlsHostname) == 0 {
+			fmt.Println("A TLS hostname must be provided when running wings with automatic TLS, e.g.:\n\n    ./wings --auto-tls --tls-hostname my.example.com")
+			os.Exit(1)
+		}
+	},
+	Run: rootCmdRun,
 }
 
 func init() {
+	root.PersistentFlags().BoolVar(&showVersion, "version", false, "show the version and exit")
 	root.PersistentFlags().StringVar(&configPath, "config", config.DefaultLocation, "set the location for the configuration file")
 	root.PersistentFlags().BoolVar(&debug, "debug", false, "pass in order to run wings in debug mode")
-	root.PersistentFlags().BoolVar(&shouldRunProfiler, "profile", false, "pass in order to profile wings")
+	root.PersistentFlags().StringVar(&profiler, "profiler", "", "the profiler to run for this instance")
+	root.PersistentFlags().BoolVar(&useAutomaticTls, "auto-tls", false, "pass in order to have wings generate and manage it's own SSL certificates using Let's Encrypt")
+	root.PersistentFlags().StringVar(&tlsHostname, "tls-hostname", "", "required with --auto-tls, the FQDN for the generated SSL certificate")
+	root.PersistentFlags().BoolVar(&ignoreCertificateErrors, "ignore-certificate-errors", false, "if passed any SSL certificate errors will be ignored by wings")
 
 	root.AddCommand(configureCmd)
+	root.AddCommand(diagnosticsCmd)
 }
 
 // Get the configuration path based on the arguments provided.
 func readConfiguration() (*config.Configuration, error) {
-	var p = configPath
+	p := configPath
 	if !strings.HasPrefix(p, "/") {
 		d, err := os.Getwd()
 		if err != nil {
@@ -53,7 +77,7 @@ func readConfiguration() (*config.Configuration, error) {
 	}
 
 	if s, err := os.Stat(p); err != nil {
-		return nil, errors.WithStack(err)
+		return nil, err
 	} else if s.IsDir() {
 		return nil, errors.New("cannot use directory as configuration file path")
 	}
@@ -62,9 +86,40 @@ func readConfiguration() (*config.Configuration, error) {
 }
 
 func rootCmdRun(*cobra.Command, []string) {
-	// Profile wings in production!!!!
-	if shouldRunProfiler {
-		defer profile.Start().Stop()
+	if showVersion {
+		fmt.Println(system.Version)
+		os.Exit(0)
+	}
+
+	switch profiler {
+	case "cpu":
+		defer profile.Start(profile.CPUProfile).Stop()
+	case "mem":
+		defer profile.Start(profile.MemProfile).Stop()
+	case "alloc":
+		defer profile.Start(profile.MemProfile, profile.MemProfileAllocs()).Stop()
+	case "heap":
+		defer profile.Start(profile.MemProfile, profile.MemProfileHeap()).Stop()
+	case "routines":
+		defer profile.Start(profile.GoroutineProfile).Stop()
+	case "mutex":
+		defer profile.Start(profile.MutexProfile).Stop()
+	case "threads":
+		defer profile.Start(profile.ThreadcreationProfile).Stop()
+	case "block":
+		defer profile.Start(profile.BlockProfile).Stop()
+	}
+
+	// Only attempt configuration file relocation if a custom location has not
+	// been specified in the command startup.
+	if configPath == config.DefaultLocation {
+		if err := RelocateConfiguration(); err != nil {
+			if errors.Is(err, os.ErrNotExist) {
+				exitWithConfigurationNotice()
+			}
+
+			panic(err)
+		}
 	}
 
 	c, err := readConfiguration()
@@ -77,15 +132,17 @@ func rootCmdRun(*cobra.Command, []string) {
 	}
 
 	printLogo()
-	if err := configureLogging(c.Debug); err != nil {
+	if err := configureLogging(c.System.LogDirectory, c.Debug); err != nil {
 		panic(err)
 	}
 
-	zap.S().Infof("using configuration from path: %s", c.GetPath())
+	log.WithField("path", c.GetPath()).Info("loading configuration from path")
 	if c.Debug {
-		zap.S().Debugw("running in debug mode")
-		zap.S().Infow("certificate checking is disabled")
+		log.Debug("running in debug mode")
+	}
 
+	if ignoreCertificateErrors {
+		log.Warn("running with --ignore-certificate-errors: TLS certificate host chains and name will not be verified")
 		http.DefaultTransport.(*http.Transport).TLSClientConfig = &tls.Config{
 			InsecureSkipVerify: true,
 		}
@@ -94,124 +151,216 @@ func rootCmdRun(*cobra.Command, []string) {
 	config.Set(c)
 	config.SetDebugViaFlag(debug)
 
+	if err := c.System.ConfigureTimezone(); err != nil {
+		log.WithField("error", err).Fatal("failed to detect system timezone or use supplied configuration value")
+		return
+	}
+
+	log.WithField("timezone", c.System.Timezone).Info("configured wings with system timezone")
+
 	if err := c.System.ConfigureDirectories(); err != nil {
-		zap.S().Panicw("failed to configure system directories for pterodactyl", zap.Error(err))
+		log.WithField("error", err).Fatal("failed to configure system directories for pterodactyl")
 		return
 	}
 
-	zap.S().Infof("checking for pterodactyl system user \"%s\"", c.System.Username)
+	if err := c.System.EnableLogRotation(); err != nil {
+		log.WithField("error", err).Fatal("failed to configure log rotation on the system")
+		return
+	}
+
+	log.WithField("username", c.System.Username).Info("checking for pterodactyl system user")
 	if su, err := c.EnsurePterodactylUser(); err != nil {
-		zap.S().Panicw("failed to create pterodactyl system user", zap.Error(err))
+		log.WithField("error", err).Fatal("failed to create pterodactyl system user")
 		return
 	} else {
-		zap.S().Infow("configured system user", zap.String("username", su.Username), zap.String("uid", su.Uid), zap.String("gid", su.Gid))
-	}
-
-	zap.S().Infow("beginning file permission setting on server data directories")
-	if err := c.EnsureFilePermissions(); err != nil {
-		zap.S().Errorw("failed to properly chown data directories", zap.Error(err))
-	} else {
-		zap.S().Infow("finished ensuring file permissions")
+		log.WithFields(log.Fields{
+			"username": su.Username,
+			"uid":      su.Uid,
+			"gid":      su.Gid,
+		}).Info("configured system user successfully")
 	}
 
 	if err := server.LoadDirectory(); err != nil {
-		zap.S().Fatalw("failed to load server configurations", zap.Error(errors.WithStack(err)))
+		log.WithField("error", err).Fatal("failed to load server configurations")
 		return
 	}
 
 	if err := environment.ConfigureDocker(&c.Docker); err != nil {
-		zap.S().Fatalw("failed to configure docker environment", zap.Error(errors.WithStack(err)))
-		os.Exit(1)
+		log.WithField("error", err).Fatal("failed to configure docker environment")
+		return
 	}
 
 	if err := c.WriteToDisk(); err != nil {
-		zap.S().Errorw("failed to save configuration to disk", zap.Error(errors.WithStack(err)))
+		log.WithField("error", err).Error("failed to save configuration to disk")
 	}
 
 	// Just for some nice log output.
 	for _, s := range server.GetServers().All() {
-		zap.S().Infow("loaded configuration for server", zap.String("server", s.Uuid))
+		log.WithField("server", s.Id()).Info("loaded configuration for server")
 	}
 
-	// Create a new WaitGroup that limits us to 4 servers being bootstrapped at a time
+	states, err := server.CachedServerStates()
+	if err != nil {
+		log.WithField("error", err).Error("failed to retrieve locally cached server states from disk, assuming all servers in offline state")
+	}
+
+	// Create a new workerpool that limits us to 4 servers being bootstrapped at a time
 	// on Wings. This allows us to ensure the environment exists, write configurations,
 	// and reboot processes without causing a slow-down due to sequential booting.
-	wg := sizedwaitgroup.New(4)
+	pool := workerpool.New(4)
 
 	for _, serv := range server.GetServers().All() {
-		wg.Add()
+		s := serv
 
-		go func(s *server.Server) {
-			defer wg.Done()
+		pool.Submit(func() {
+			s.Log().Info("configuring server environment and restoring to previous state")
 
-			// Create a server environment if none exists currently. This allows us to recover from Docker
-			// being reinstalled on the host system for example.
-			zap.S().Infow("ensuring environment exists", zap.String("server", s.Uuid))
-			if err := s.Environment.Create(); err != nil {
-				zap.S().Errorw("failed to create an environment for server", zap.String("server", s.Uuid), zap.Error(err))
+			var st string
+			if state, exists := states[s.Id()]; exists {
+				st = state
 			}
 
 			r, err := s.Environment.IsRunning()
-			if err != nil {
-				zap.S().Errorw("error checking server environment status", zap.String("server", s.Uuid), zap.Error(err))
+			// We ignore missing containers because we don't want to actually block booting of wings at this
+			// point. If we didn't do this and you pruned all of the images and then started wings you could
+			// end up waiting a long period of time for all of the images to be re-pulled on Wings boot rather
+			// than when the server itself is started.
+			if err != nil && !client.IsErrNotFound(err) {
+				s.Log().WithField("error", err).Error("error checking server environment status")
 			}
 
-			// If the server is currently running on Docker, mark the process as being in that state.
-			// We never want to stop an instance that is currently running external from Wings since
-			// that is a good way of keeping things running even if Wings gets in a very corrupted state.
+			// Check if the server was previously running. If so, attempt to start the server now so that Wings
+			// can pick up where it left off. If the environment does not exist at all, just create it and then allow
+			// the normal flow to execute.
 			//
-			// This will also validate that a server process is running if the last tracked state we have
-			// is that it was running, but we see that the container process is not currently running.
-			if r || (!r && s.IsRunning()) {
-				zap.S().Infow("detected server is running, re-attaching to process", zap.String("server", s.Uuid))
-				if err := s.Environment.Start(); err != nil {
-					zap.S().Warnw(
-						"failed to properly start server detected as already running",
-						zap.String("server", s.Uuid),
-						zap.Error(errors.WithStack(err)),
-					)
+			// This does mean that booting wings after a catastrophic machine crash and wiping out the Docker images
+			// as a result will result in a slow boot.
+			if !r && (st == environment.ProcessRunningState || st == environment.ProcessStartingState) {
+				if err := s.HandlePowerAction(server.PowerActionStart); err != nil {
+					s.Log().WithField("error", err).Warn("failed to return server to running state")
 				}
+			} else if r || (!r && s.IsRunning()) {
+				// If the server is currently running on Docker, mark the process as being in that state.
+				// We never want to stop an instance that is currently running external from Wings since
+				// that is a good way of keeping things running even if Wings gets in a very corrupted state.
+				//
+				// This will also validate that a server process is running if the last tracked state we have
+				// is that it was running, but we see that the container process is not currently running.
+				s.Log().Info("detected server is running, re-attaching to process...")
 
-				return
+				s.Environment.SetState(environment.ProcessRunningState)
+				if err := s.Environment.Attach(); err != nil {
+					s.Log().WithField("error", err).Warn("failed to attach to running server environment")
+				}
+			} else {
+				// At this point we've determined that the server should indeed be in an offline state, so we'll
+				// make a call to set that state just to ensure we don't ever accidentally end up with some invalid
+				// state being tracked.
+				s.Environment.SetState(environment.ProcessOfflineState)
 			}
-
-			// Addresses potentially invalid data in the stored file that can cause Wings to lose
-			// track of what the actual server state is.
-			s.SetState(server.ProcessOfflineState)
-		}(serv)
+		})
 	}
 
-	// Wait until all of the servers are ready to go before we fire up the HTTP server.
-	wg.Wait()
+	// Wait until all of the servers are ready to go before we fire up the SFTP and HTTP servers.
+	pool.StopWait()
 
-	// If the SFTP subsystem should be started, do so now.
-	if c.System.Sftp.UseInternalSystem {
-		sftp.Initialize(c)
+	// Initialize the SFTP server.
+	if err := sftp.Initialize(c.System); err != nil {
+		log.WithError(err).Fatal("failed to initialize the sftp server")
+		return
 	}
 
 	// Ensure the archive directory exists.
 	if err := os.MkdirAll(c.System.ArchiveDirectory, 0755); err != nil {
-		zap.S().Errorw("failed to create archive directory", zap.Error(err))
+		log.WithField("error", err).Error("failed to create archive directory")
 	}
 
 	// Ensure the backup directory exists.
 	if err := os.MkdirAll(c.System.BackupDirectory, 0755); err != nil {
-		zap.S().Errorw("failed to create backup directory", zap.Error(err))
+		log.WithField("error", err).Error("failed to create backup directory")
 	}
 
-	zap.S().Infow("configuring webserver", zap.Bool("ssl", c.Api.Ssl.Enabled), zap.String("host", c.Api.Host), zap.Int("port", c.Api.Port))
+	log.WithFields(log.Fields{
+		"use_ssl":      c.Api.Ssl.Enabled,
+		"use_auto_tls": useAutomaticTls && len(tlsHostname) > 0,
+		"host_address": c.Api.Host,
+		"host_port":    c.Api.Port,
+	}).Info("configuring internal webserver")
 
+	// Configure the router.
 	r := router.Configure()
-	addr := fmt.Sprintf("%s:%d", c.Api.Host, c.Api.Port)
 
+	s := &http.Server{
+		Addr:    fmt.Sprintf("%s:%d", c.Api.Host, c.Api.Port),
+		Handler: r,
+
+		TLSConfig: &tls.Config{
+			NextProtos: []string{"h2", "http/1.1"},
+			// @see https://blog.cloudflare.com/exposing-go-on-the-internet
+			CipherSuites: []uint16{
+				tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+				tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+				tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+				tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
+				tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
+				tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
+			},
+			PreferServerCipherSuites: true,
+			MinVersion:               tls.VersionTLS12,
+			MaxVersion:               tls.VersionTLS13,
+			CurvePreferences:         []tls.CurveID{tls.X25519, tls.CurveP256},
+		},
+	}
+
+	// Check if the server should run with TLS but using autocert.
+	if useAutomaticTls && len(tlsHostname) > 0 {
+		m := autocert.Manager{
+			Prompt:     autocert.AcceptTOS,
+			Cache:      autocert.DirCache(path.Join(c.System.RootDirectory, "/.tls-cache")),
+			HostPolicy: autocert.HostWhitelist(tlsHostname),
+		}
+
+		log.WithField("hostname", tlsHostname).
+			Info("webserver is now listening with auto-TLS enabled; certificates will be automatically generated by Let's Encrypt")
+
+		// Hook autocert into the main http server.
+		s.TLSConfig.GetCertificate = m.GetCertificate
+		s.TLSConfig.NextProtos = append(s.TLSConfig.NextProtos, acme.ALPNProto) // enable tls-alpn ACME challenges
+
+		// Start the autocert server.
+		go func() {
+			if err := http.ListenAndServe(":http", m.HTTPHandler(nil)); err != nil {
+				log.WithError(err).Error("failed to serve autocert http server")
+			}
+		}()
+
+		// Start the main http server with TLS using autocert.
+		if err := s.ListenAndServeTLS("", ""); err != nil {
+			log.WithFields(log.Fields{"auto_tls": true, "tls_hostname": tlsHostname, "error": err}).
+				Fatal("failed to configure HTTP server using auto-tls")
+		}
+
+		return
+	}
+
+	// Check if main http server should run with TLS.
 	if c.Api.Ssl.Enabled {
-		if err := r.RunTLS(addr, c.Api.Ssl.CertificateFile, c.Api.Ssl.KeyFile); err != nil {
-			zap.S().Fatalw("failed to configure HTTPS server", zap.Error(err))
-		}
-	} else {
-		if err := r.Run(addr); err != nil {
-			zap.S().Fatalw("failed to configure HTTP server", zap.Error(err))
+		if err := s.ListenAndServeTLS(strings.ToLower(c.Api.Ssl.CertificateFile), strings.ToLower(c.Api.Ssl.KeyFile)); err != nil {
+			log.WithFields(log.Fields{"auto_tls": false, "error": err}).Fatal("failed to configure HTTPS server")
 		}
+		return
+	}
+
+	// Run the main http server without TLS.
+	s.TLSConfig = nil
+	if err := s.ListenAndServe(); err != nil {
+		log.WithField("error", err).Fatal("failed to configure HTTP server")
+	}
+
+	// Cancel the context on all of the running servers at this point, even though the
+	// program is just shutting down.
+	for _, s := range server.GetServers().All() {
+		s.CtxCancel()
 	}
 }
 
@@ -222,40 +371,70 @@ func Execute() error {
 
 // Configures the global logger for Zap so that we can call it from any location
 // in the code without having to pass around a logger instance.
-func configureLogging(debug bool) error {
-	cfg := zap.NewProductionConfig()
-	if debug {
-		cfg = zap.NewDevelopmentConfig()
-	}
-
-	cfg.Encoding = "console"
-	cfg.OutputPaths = []string{
-		"stdout",
-	}
-
-	logger, err := cfg.Build()
-	if err != nil {
+func configureLogging(logDir string, debug bool) error {
+	if err := os.MkdirAll(path.Join(logDir, "/install"), 0700); err != nil {
 		return err
 	}
 
-	zap.ReplaceGlobals(logger)
+	p := filepath.Join(logDir, "/wings.log")
+	w, err := logrotate.NewFile(p)
+	if err != nil {
+		panic(errors.WithMessage(err, "failed to open process log file"))
+	}
+
+	if debug {
+		log.SetLevel(log.DebugLevel)
+	} else {
+		log.SetLevel(log.InfoLevel)
+	}
+
+	log.SetHandler(multi.New(
+		cli.Default,
+		cli.New(w.File, false),
+	))
+
+	log.WithField("path", p).Info("writing log files to disk")
 
 	return nil
 }
 
 // Prints the wings logo, nothing special here!
 func printLogo() {
-	fmt.Println()
-	fmt.Println(`                     ____`)
-	fmt.Println(`__ Pterodactyl _____/___/_______ _______ ______`)
-	fmt.Println(`\_____\    \/\/    /   /       /  __   /   ___/`)
-	fmt.Println(`   \___\          /   /   /   /  /_/  /___   /`)
-	fmt.Println(`        \___/\___/___/___/___/___    /______/`)
-	fmt.Println(`                            /_______/ v` + system.Version)
-	fmt.Println()
-	fmt.Println(`Website: https://pterodactyl.io`)
-	fmt.Println(`Source: https://github.com/pterodactyl/wings`)
-	fmt.Println()
-	fmt.Println(`Copyright © 2018 - 2020 Dane Everitt & Contributors`)
-	fmt.Println()
+	fmt.Printf(colorstring.Color(`
+                     ____
+__ [blue][bold]Pterodactyl[reset] _____/___/_______ _______ ______
+\_____\    \/\/    /   /       /  __   /   ___/
+   \___\          /   /   /   /  /_/  /___   /
+        \___/\___/___/___/___/___    /______/
+                            /_______/ [bold]v%s[reset]
+
+Copyright © 2018 - 2021 Dane Everitt & Contributors
+
+Website:  https://pterodactyl.io
+ Source:  https://github.com/pterodactyl/wings
+License:  https://github.com/pterodactyl/wings/blob/develop/LICENSE
+
+This software is made available under the terms of the MIT license.
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.%s`), system.Version, "\n\n")
+}
+
+func exitWithConfigurationNotice() {
+	fmt.Print(colorstring.Color(`
+[_red_][white][bold]Error: Configuration File Not Found[reset]
+
+Wings was not able to locate your configuration file, and therefore is not
+able to complete its boot process.
+
+Please ensure you have copied your instance configuration file into
+the default location, or have provided the --config flag to use a
+custom location.
+
+Default Location: /etc/pterodactyl/config.yml
+
+[yellow]This is not a bug with this software. Please do not make a bug report
+for this issue, it will be closed.[reset]
+
+`))
+	os.Exit(1)
 }

config/config.go

@@ -1,25 +1,22 @@
 package config
 
 import (
-	"errors"
+	"emperror.dev/errors"
 	"fmt"
 	"github.com/cobaugh/osrelease"
 	"github.com/creasty/defaults"
 	"github.com/gbrlsnchs/jwt/v3"
-	"go.uber.org/zap"
 	"gopkg.in/yaml.v2"
 	"io/ioutil"
 	"os"
 	"os/exec"
 	"os/user"
-	"path"
-	"regexp"
 	"strconv"
 	"strings"
 	"sync"
 )
 
-const DefaultLocation = "/var/lib/pterodactyl/config.yml"
+const DefaultLocation = "/etc/pterodactyl/config.yml"
 
 type Configuration struct {
 	sync.RWMutex `json:"-" yaml:"-"`
@@ -46,50 +43,31 @@ type Configuration struct {
 	// validate against it.
 	AuthenticationToken string `json:"token" yaml:"token"`
 
-	Api    ApiConfiguration
-	System SystemConfiguration
-	Docker DockerConfiguration
-
-	// The amount of time in seconds that should elapse between disk usage checks
-	// run by the daemon. Setting a higher number can result in better IO performance
-	// at an increased risk of a malicious user creating a process that goes over
-	// the assigned disk limits.
-	DiskCheckTimeout int `yaml:"disk_check_timeout"`
+	Api    ApiConfiguration    `json:"api" yaml:"api"`
+	System SystemConfiguration `json:"system" yaml:"system"`
+	Docker DockerConfiguration `json:"docker" yaml:"docker"`
 
 	// Defines internal throttling configurations for server processes to prevent
 	// someone from running an endless loop that spams data to logs.
-	Throttles struct {
-		// The number of data overage warnings (inclusive) that can accumulate
-		// before a process is terminated.
-		KillAtCount int `default:"5" yaml:"kill_at_count"`
-
-		// The number of seconds that must elapse before the internal counter
-		// begins decrementing warnings assigned to a process that is outputting
-		// too much data.
-		DecaySeconds int `default:"10" json:"decay" yaml:"decay"`
-
-		// The total number of bytes allowed to be output by a server process
-		// per interval.
-		BytesPerInterval int `default:"4096" json:"bytes" yaml:"bytes"`
-
-		// The amount of time that should lapse between data output throttle
-		// checks. This should be defined in milliseconds.
-		CheckInterval int `default:"100" yaml:"check_interval"`
-	}
+	Throttles ConsoleThrottles
 
 	// The location where the panel is running that this daemon should connect to
 	// to collect data and send events.
-	PanelLocation string `json:"remote" yaml:"remote"`
+	PanelLocation string                   `json:"remote" yaml:"remote"`
+	RemoteQuery   RemoteQueryConfiguration `json:"remote_query" yaml:"remote_query"`
+
+	// AllowedMounts is a list of allowed host-system mount points.
+	// This is required to have the "Server Mounts" feature work properly.
+	AllowedMounts []string `json:"-" yaml:"allowed_mounts"`
+
+	// AllowedOrigins is a list of allowed request origins.
+	// The Panel URL is automatically allowed, this is only needed for adding
+	// additional origins.
+	AllowedOrigins []string `json:"allowed_origins" yaml:"allowed_origins"`
 }
 
 // Defines the configuration of the internal SFTP server.
 type SftpConfiguration struct {
-	// If set to false, the internal SFTP server will not be booted and you will need
-	// to run the SFTP server independent of this program.
-	UseInternalSystem bool `default:"true" json:"use_internal" yaml:"use_internal"`
-	// If set to true disk checking will not be performed. This will prevent the SFTP
-	// server from checking the total size of a directory when uploading files.
-	DisableDiskChecking bool `default:"false" yaml:"disable_disk_checking"`
 	// The bind address of the SFTP server.
 	Address string `default:"0.0.0.0" json:"bind_address" yaml:"bind_address"`
 	// The bind port of the SFTP server.
@@ -118,6 +96,27 @@ type ApiConfiguration struct {
 	UploadLimit int `default:"100" json:"upload_limit" yaml:"upload_limit"`
 }
 
+// Defines the configuration settings for remote requests from Wings to the Panel.
+type RemoteQueryConfiguration struct {
+	// The amount of time in seconds that Wings should allow for a request to the Panel API
+	// to complete. If this time passes the request will be marked as failed. If your requests
+	// are taking longer than 30 seconds to complete it is likely a performance issue that
+	// should be resolved on the Panel, and not something that should be resolved by upping this
+	// number.
+	Timeout uint `default:"30" yaml:"timeout"`
+
+	// The number of servers to load in a single request to the Panel API when booting the
+	// Wings instance. A single request is initially made to the Panel to get this number
+	// of servers, and then the pagination status is checked and additional requests are
+	// fired off in parallel to request the remaining pages.
+	//
+	// It is not recommended to change this from the default as you will likely encounter
+	// memory limits on your Panel instance. In the grand scheme of things 4 requests for
+	// 50 servers is likely just as quick as two for 100 or one for 400, and will certainly
+	// be less likely to cause performance issues on the Panel.
+	BootServersPerPage uint `default:"50" yaml:"boot_servers_per_page"`
+}
+
 // Reads the configuration from the provided file and returns the configuration
 // object that can then be used.
 func ReadConfiguration(path string) (*Configuration, error) {
@@ -135,7 +134,7 @@ func ReadConfiguration(path string) (*Configuration, error) {
 	}
 
 	// Track the location where we created this configuration.
-	c.path = path
+	c.unsafeSetPath(path)
 
 	// Replace environment variables within the configuration file with their
 	// values from the host system.
@@ -148,7 +147,7 @@ func ReadConfiguration(path string) (*Configuration, error) {
 	return c, nil
 }
 
-var Mutex sync.RWMutex
+var mu sync.RWMutex
 
 var _config *Configuration
 var _jwtAlgo *jwt.HMACSHA
@@ -158,14 +157,14 @@ var _debugViaFlag bool
 // anything trying to set a different configuration value, or read the configuration
 // will be paused until it is complete.
 func Set(c *Configuration) {
-	Mutex.Lock()
+	mu.Lock()
 
 	if _config == nil || _config.AuthenticationToken != c.AuthenticationToken {
 		_jwtAlgo = jwt.NewHS256([]byte(c.AuthenticationToken))
 	}
 
 	_config = c
-	Mutex.Unlock()
+	mu.Unlock()
 }
 
 func SetDebugViaFlag(d bool) {
@@ -175,22 +174,46 @@ func SetDebugViaFlag(d bool) {
 // Get the global configuration instance. This is a read-safe operation that will block
 // if the configuration is presently being modified.
 func Get() *Configuration {
-	Mutex.RLock()
-	defer Mutex.RUnlock()
+	mu.RLock()
+	defer mu.RUnlock()
 
 	return _config
 }
 
 // Returns the in-memory JWT algorithm.
 func GetJwtAlgorithm() *jwt.HMACSHA {
-	Mutex.RLock()
-	defer Mutex.RUnlock()
+	mu.RLock()
+	defer mu.RUnlock()
 
 	return _jwtAlgo
 }
 
+// Create a new struct and set the path where it should be stored.
+func NewFromPath(path string) (*Configuration, error) {
+	c := new(Configuration)
+	if err := defaults.Set(c); err != nil {
+		return c, err
+	}
+
+	c.unsafeSetPath(path)
+
+	return c, nil
+}
+
+// Sets the path where the configuration file is located on the server. This function should
+// not be called except by processes that are generating the configuration such as the configuration
+// command shipped with this software.
+func (c *Configuration) unsafeSetPath(path string) {
+	c.Lock()
+	c.path = path
+	c.Unlock()
+}
+
 // Returns the path for this configuration file.
 func (c *Configuration) GetPath() string {
+	c.RLock()
+	defer c.RUnlock()
+
 	return c.path
 }
 
@@ -200,6 +223,36 @@ func (c *Configuration) GetPath() string {
 // If files are not owned by this user there will be issues with permissions on Docker
 // mount points.
 func (c *Configuration) EnsurePterodactylUser() (*user.User, error) {
+	sysName, err := getSystemName()
+	if err != nil {
+		return nil, err
+	}
+
+	// Our way of detecting if wings is running inside of Docker.
+	if sysName == "busybox" {
+		uid := os.Getenv("WINGS_UID")
+		if uid == "" {
+			uid = "988"
+		}
+
+		gid := os.Getenv("WINGS_GID")
+		if gid == "" {
+			gid = "988"
+		}
+
+		username := os.Getenv("WINGS_USERNAME")
+		if username == "" {
+			username = "pterodactyl"
+		}
+
+		u := &user.User{
+			Uid:      uid,
+			Gid:      gid,
+			Username: username,
+		}
+		return u, c.setSystemUser(u)
+	}
+
 	u, err := user.Lookup(c.System.Username)
 
 	// If an error is returned but it isn't the unknown user error just abort
@@ -210,17 +263,12 @@ func (c *Configuration) EnsurePterodactylUser() (*user.User, error) {
 		return nil, err
 	}
 
-	sysName, err := getSystemName()
-	if err != nil {
-		return nil, err
-	}
-
-	var command = fmt.Sprintf("useradd --system --no-create-home --shell /bin/false %s", c.System.Username)
+	command := fmt.Sprintf("useradd --system --no-create-home --shell /usr/sbin/nologin %s", c.System.Username)
 
 	// Alpine Linux is the only OS we currently support that doesn't work with the useradd command, so
 	// in those cases we just modify the command a bit to work as expected.
 	if strings.HasPrefix(sysName, "alpine") {
-		command = fmt.Sprintf("adduser -S -D -H -G %[1]s -s /bin/false %[1]s", c.System.Username)
+		command = fmt.Sprintf("adduser -S -D -H -G %[1]s -s /sbin/nologin %[1]s", c.System.Username)
 
 		// We have to create the group first on Alpine, so do that here before continuing on
 		// to the user creation process.
@@ -244,75 +292,33 @@ func (c *Configuration) EnsurePterodactylUser() (*user.User, error) {
 // Set the system user into the configuration and then write it to the disk so that
 // it is persisted on boot.
 func (c *Configuration) setSystemUser(u *user.User) error {
-	uid, _ := strconv.Atoi(u.Uid)
-	gid, _ := strconv.Atoi(u.Gid)
+	uid, err := strconv.Atoi(u.Uid)
+	if err != nil {
+		return err
+	}
+
+	gid, err := strconv.Atoi(u.Gid)
+	if err != nil {
+		return err
+	}
 
 	c.Lock()
-	defer c.Unlock()
-
 	c.System.Username = u.Username
 	c.System.User.Uid = uid
 	c.System.User.Gid = gid
+	c.Unlock()
 
 	return c.WriteToDisk()
 }
 
-// Ensures that the configured data directory has the correct permissions assigned to
-// all of the files and folders within.
-func (c *Configuration) EnsureFilePermissions() error {
-	// Don't run this unless it is configured to be run. On large system this can often slow
-	// things down dramatically during the boot process.
-	if !c.System.SetPermissionsOnBoot {
-		return nil
-	}
-
-	r := regexp.MustCompile("^[a-f0-9]{8}-[a-f0-9]{4}-4[a-f0-9]{3}-[89ab][a-f0-9]{3}-[a-f0-9]{12}$")
-
-	files, err := ioutil.ReadDir(c.System.Data)
-	if err != nil {
-		return err
-	}
-
-	su, err := user.Lookup(c.System.Username)
-	if err != nil {
-		return err
-	}
-
-	wg := new(sync.WaitGroup)
-
-	for _, file := range files {
-		wg.Add(1)
-
-		// Asynchronously run through the list of files and folders in the data directory. If
-		// the item is not a folder, or is not a folder that matches the expected UUIDv4 format
-		// skip over it.
-		//
-		// If we do have a positive match, run a chown against the directory.
-		go func(f os.FileInfo) {
-			defer wg.Done()
-
-			if !f.IsDir() || !r.MatchString(f.Name()) {
-				return
-			}
-
-			uid, _ := strconv.Atoi(su.Uid)
-			gid, _ := strconv.Atoi(su.Gid)
-
-			if err := os.Chown(path.Join(c.System.Data, f.Name()), uid, gid); err != nil {
-				zap.S().Warnw("failed to chown server directory", zap.String("directory", f.Name()), zap.Error(err))
-			}
-		}(file)
-	}
-
-	wg.Wait()
-
-	return nil
-}
-
 // Writes the configuration to the disk as a blocking operation by obtaining an exclusive
 // lock on the file. This prevents something else from writing at the exact same time and
 // leading to bad data conditions.
 func (c *Configuration) WriteToDisk() error {
+	// Obtain an exclusive write against the configuration file.
+	c.writeLock.Lock()
+	defer c.writeLock.Unlock()
+
 	ccopy := *c
 	// If debugging is set with the flag, don't save that to the configuration file, otherwise
 	// you'll always end up in debug mode.
@@ -329,10 +335,6 @@ func (c *Configuration) WriteToDisk() error {
 		return err
 	}
 
-	// Obtain an exclusive write against the configuration file.
-	c.writeLock.Lock()
-	defer c.writeLock.Unlock()
-
 	if err := ioutil.WriteFile(c.GetPath(), b, 0644); err != nil {
 		return err
 	}

config/config_docker.go

@@ -1,5 +1,11 @@
 package config
 
+import (
+	"encoding/base64"
+	"encoding/json"
+	"github.com/docker/docker/api/types"
+)
+
 type dockerNetworkInterfaces struct {
 	V4 struct {
 		Subnet  string `default:"172.18.0.0/16"`
@@ -15,7 +21,7 @@ type dockerNetworkInterfaces struct {
 type DockerNetworkConfiguration struct {
 	// The interface that should be used to create the network. Must not conflict
 	// with any other interfaces in use by Docker or on the system.
-	Interface string `default:"172.18.0.1"`
+	Interface string `default:"172.18.0.1" json:"interface" yaml:"interface"`
 
 	// The DNS settings for containers.
 	Dns []string `default:"[\"1.1.1.1\", \"1.0.0.1\"]"`
@@ -26,6 +32,7 @@ type DockerNetworkConfiguration struct {
 	Name       string                  `default:"pterodactyl_nw"`
 	ISPN       bool                    `default:"false" yaml:"ispn"`
 	Driver     string                  `default:"bridge"`
+	Mode       string                  `default:"pterodactyl_nw" yaml:"network_mode"`
 	IsInternal bool                    `default:"false" yaml:"is_internal"`
 	EnableICC  bool                    `default:"true" yaml:"enable_icc"`
 	Interfaces dockerNetworkInterfaces `yaml:"interfaces"`
@@ -38,15 +45,35 @@ type DockerConfiguration struct {
 	// for containers run through the daemon.
 	Network DockerNetworkConfiguration `json:"network" yaml:"network"`
 
-	// If true, container images will be updated when a server starts if there
-	// is an update available. If false the daemon will not attempt updates and will
-	// defer to the host system to manage image updates.
-	UpdateImages bool `default:"true" json:"update_images" yaml:"update_images"`
+	// Domainname is the Docker domainname for all containers.
+	Domainname string `default:"" json:"domainname" yaml:"domainname"`
 
-	// The location of the Docker socket.
-	Socket string `default:"/var/run/docker.sock"`
+	// Registries .
+	Registries map[string]RegistryConfiguration `json:"registries" yaml:"registries"`
 
-	// Defines the location of the timezone file on the host system that should
-	// be mounted into the created containers so that they all use the same time.
-	TimezonePath string `default:"/etc/timezone" json:"timezone_path" yaml:"timezone_path"`
+	// The size of the /tmp directory when mounted into a container. Please be aware that Docker
+	// utilizes host memory for this value, and that we do not keep track of the space used here
+	// so avoid allocating too much to a server.
+	TmpfsSize uint `default:"100" json:"tmpfs_size" yaml:"tmpfs_size"`
+}
+
+// RegistryConfiguration .
+type RegistryConfiguration struct {
+	Username string `yaml:"username"`
+	Password string `yaml:"password"`
+}
+
+// Base64 .
+func (c RegistryConfiguration) Base64() (string, error) {
+	authConfig := types.AuthConfig{
+		Username: c.Username,
+		Password: c.Password,
+	}
+
+	b, err := json.Marshal(authConfig)
+	if err != nil {
+		return "", err
+	}
+
+	return base64.URLEncoding.EncodeToString(b), nil
 }

config/config_system.go

@@ -1,9 +1,18 @@
 package config
 
 import (
-	"go.uber.org/zap"
+	"context"
+	"emperror.dev/errors"
+	"fmt"
+	"github.com/apex/log"
+	"html/template"
+	"io/ioutil"
 	"os"
+	"os/exec"
 	"path"
+	"path/filepath"
+	"regexp"
+	"time"
 )
 
 // Defines basic system configuration settings.
@@ -26,6 +35,13 @@ type SystemConfiguration struct {
 	// The user that should own all of the server files, and be used for containers.
 	Username string `default:"pterodactyl" yaml:"username"`
 
+	// The timezone for this Wings instance. This is detected by Wings automatically if possible,
+	// and falls back to UTC if not able to be detected. If you need to set this manually, that
+	// can also be done.
+	//
+	// This timezone value is passed into all containers created by Wings.
+	Timezone string `yaml:"timezone"`
+
 	// Definitions for the user that gets created to ensure that we can quickly access
 	// this information without constantly having to do a system lookup.
 	User struct {
@@ -33,51 +49,107 @@ type SystemConfiguration struct {
 		Gid int
 	}
 
-	// Determines if permissions for a server should be set automatically on
-	// daemon boot. This can take a long time on systems with many servers, or on
-	// systems with servers containing thousands of files.
+	// The amount of time in seconds that can elapse before a server's disk space calculation is
+	// considered stale and a re-check should occur. DANGER: setting this value too low can seriously
+	// impact system performance and cause massive I/O bottlenecks and high CPU usage for the Wings
+	// process.
 	//
-	// Setting this to true by default helps us avoid a lot of support requests
-	// from people that keep trying to move files around as a root user leading
-	// to server permission issues.
-	//
-	// In production and heavy use environments where boot speed is essential,
-	// this should be set to false as servers will self-correct permissions on
-	// boot anyways.
-	SetPermissionsOnBoot bool `default:"true" yaml:"set_permissions_on_boot"`
+	// Set to 0 to disable disk checking entirely. This will always return 0 for the disk space used
+	// by a server and should only be set in extreme scenarios where performance is critical and
+	// disk usage is not a concern.
+	DiskCheckInterval int64 `default:"150" yaml:"disk_check_interval"`
 
+	// If set to true, file permissions for a server will be checked when the process is
+	// booted. This can cause boot delays if the server has a large amount of files. In most
+	// cases disabling this should not have any major impact unless external processes are
+	// frequently modifying a servers' files.
+	CheckPermissionsOnBoot bool `default:"true" yaml:"check_permissions_on_boot"`
+
+	// If set to false Wings will not attempt to write a log rotate configuration to the disk
+	// when it boots and one is not detected.
+	EnableLogRotate bool `default:"true" yaml:"enable_log_rotate"`
+
+	// The number of lines to send when a server connects to the websocket.
+	WebsocketLogCount int `default:"150" yaml:"websocket_log_count"`
+
+	Sftp SftpConfiguration `yaml:"sftp"`
+
+	CrashDetection CrashDetection `yaml:"crash_detection"`
+
+	Backups Backups `yaml:"backups"`
+
+	Transfers Transfers `yaml:"transfers"`
+}
+
+type CrashDetection struct {
 	// Determines if Wings should detect a server that stops with a normal exit code of
 	// "0" as being crashed if the process stopped without any Wings interaction. E.g.
 	// the user did not press the stop button, but the process stopped cleanly.
 	DetectCleanExitAsCrash bool `default:"true" yaml:"detect_clean_exit_as_crash"`
 
-	Sftp *SftpConfiguration `yaml:"sftp"`
+	// Timeout specifies the timeout between crashes that will not cause the server
+	// to be automatically restarted, this value is used to prevent servers from
+	// becoming stuck in a boot-loop after multiple consecutive crashes.
+	Timeout int `default:"60" json:"timeout"`
+}
+
+type Backups struct {
+	// WriteLimit imposes a Disk I/O write limit on backups to the disk, this affects all
+	// backup drivers as the archiver must first write the file to the disk in order to
+	// upload it to any external storage provider.
+	//
+	// If the value is less than 1, the write speed is unlimited,
+	// if the value is greater than 0, the write speed is the value in MiB/s.
+	//
+	// Defaults to 0 (unlimited)
+	WriteLimit int `default:"0" yaml:"write_limit"`
+}
+
+type Transfers struct {
+	// DownloadLimit imposes a Network I/O read limit when downloading a transfer archive.
+	//
+	// If the value is less than 1, the write speed is unlimited,
+	// if the value is greater than 0, the write speed is the value in MiB/s.
+	//
+	// Defaults to 0 (unlimited)
+	DownloadLimit int `default:"0" yaml:"download_limit"`
 }
 
 // Ensures that all of the system directories exist on the system. These directories are
 // created so that only the owner can read the data, and no other users.
 func (sc *SystemConfiguration) ConfigureDirectories() error {
-	zap.S().Debugw("ensuring root data directory exists", zap.String("path", sc.RootDirectory))
+	log.WithField("path", sc.RootDirectory).Debug("ensuring root data directory exists")
 	if err := os.MkdirAll(sc.RootDirectory, 0700); err != nil {
 		return err
 	}
 
-	zap.S().Debugw("ensuring log directory exists", zap.String("path", sc.LogDirectory))
-	if err := os.MkdirAll(path.Join(sc.LogDirectory, "/install"), 0700); err != nil {
-		return err
+	// There are a non-trivial number of users out there whose data directories are actually a
+	// symlink to another location on the disk. If we do not resolve that final destination at this
+	// point things will appear to work, but endless errors will be encountered when we try to
+	// verify accessed paths since they will all end up resolving outside the expected data directory.
+	//
+	// For the sake of automating away as much of this as possible, see if the data directory is a
+	// symlink, and if so resolve to its final real path, and then update the configuration to use
+	// that.
+	if d, err := filepath.EvalSymlinks(sc.Data); err != nil {
+		if !os.IsNotExist(err) {
+			return err
+		}
+	} else if d != sc.Data {
+		sc.Data = d
 	}
 
-	zap.S().Debugw("ensuring server data directory exists", zap.String("path", sc.Data))
+	log.WithField("path", sc.Data).Debug("ensuring server data directory exists")
 	if err := os.MkdirAll(sc.Data, 0700); err != nil {
 		return err
 	}
 
-	zap.S().Debugw("ensuring archive data directory exists", zap.String("path", sc.ArchiveDirectory))
+	log.WithField("path", sc.ArchiveDirectory).Debug("ensuring archive data directory exists")
 	if err := os.MkdirAll(sc.ArchiveDirectory, 0700); err != nil {
 		return err
 	}
 
-	zap.S().Debugw("ensuring backup data directory exists", zap.String("path", sc.BackupDirectory))
+	log.WithField("path", sc.BackupDirectory).Debug("ensuring backup data directory exists")
 	if err := os.MkdirAll(sc.BackupDirectory, 0700); err != nil {
 		return err
 	}
@@ -85,6 +157,61 @@ func (sc *SystemConfiguration) ConfigureDirectories() error {
 	return nil
 }
 
+// Writes a logrotate file for wings to the system logrotate configuration directory if one
+// exists and a logrotate file is not found. This allows us to basically automate away the log
+// rotation for most installs, but also enable users to make modifications on their own.
+func (sc *SystemConfiguration) EnableLogRotation() error {
+	// Do nothing if not enabled.
+	if sc.EnableLogRotate == false {
+		log.Info("skipping log rotate configuration, disabled in wings config file")
+
+		return nil
+	}
+
+	if st, err := os.Stat("/etc/logrotate.d"); err != nil && !os.IsNotExist(err) {
+		return err
+	} else if (err != nil && os.IsNotExist(err)) || !st.IsDir() {
+		return nil
+	}
+
+	if _, err := os.Stat("/etc/logrotate.d/wings"); err != nil && !os.IsNotExist(err) {
+		return err
+	} else if err == nil {
+		return nil
+	}
+
+	log.Info("no log rotation configuration found, system is configured to support it, adding file now")
+	// If we've gotten to this point it means the logrotate directory exists on the system
+	// but there is not a file for wings already. In that case, let us write a new file to
+	// it so files can be rotated easily.
+	f, err := os.Create("/etc/logrotate.d/wings")
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	t, err := template.New("logrotate").Parse(`
+{{.LogDirectory}}/wings.log {
+    size 10M
+    compress
+    delaycompress
+    dateext
+    maxage 7
+    missingok
+    notifempty
+    create 0640 {{.User.Uid}} {{.User.Gid}}
+    postrotate
+        killall -SIGHUP wings
+    endscript
+}`)
+
+	if err != nil {
+		return err
+	}
+
+	return errors.WithMessage(t.Execute(f, sc), "failed to write logrotate file to disk")
+}
+
 // Returns the location of the JSON file that tracks server states.
 func (sc *SystemConfiguration) GetStatesPath() string {
 	return path.Join(sc.RootDirectory, "states.json")
@@ -94,3 +221,47 @@ func (sc *SystemConfiguration) GetStatesPath() string {
 func (sc *SystemConfiguration) GetInstallLogPath() string {
 	return path.Join(sc.LogDirectory, "install/")
 }
+
+// Configures the timezone data for the configuration if it is currently missing. If
+// a value has been set, this functionality will only run to validate that the timezone
+// being used is valid.
+func (sc *SystemConfiguration) ConfigureTimezone() error {
+	if sc.Timezone == "" {
+		if b, err := ioutil.ReadFile("/etc/timezone"); err != nil {
+			if !os.IsNotExist(err) {
+				return errors.WithMessage(err, "failed to open /etc/timezone for automatic server timezone calibration")
+			}
+
+			ctx, _ := context.WithTimeout(context.Background(), time.Second*5)
+			// Okay, file isn't found on this OS, we will try using timedatectl to handle this. If this
+			// command fails, exit, but if it returns a value use that. If no value is returned we will
+			// fall through to UTC to get Wings booted at least.
+			out, err := exec.CommandContext(ctx, "timedatectl").Output()
+			if err != nil {
+				log.WithField("error", err).Warn("failed to execute \"timedatectl\" to determine system timezone, falling back to UTC")
+
+				sc.Timezone = "UTC"
+				return nil
+			}
+
+			r := regexp.MustCompile(`Time zone: ([\w/]+)`)
+			matches := r.FindSubmatch(out)
+			if len(matches) != 2 || string(matches[1]) == "" {
+				log.Warn("failed to parse timezone from \"timedatectl\" output, falling back to UTC")
+
+				sc.Timezone = "UTC"
+				return nil
+			}
+
+			sc.Timezone = string(matches[1])
+		} else {
+			sc.Timezone = string(b)
+		}
+	}
+
+	sc.Timezone = regexp.MustCompile(`(?i)[^a-z_/]+`).ReplaceAllString(sc.Timezone, "")
+
+	_, err := time.LoadLocation(sc.Timezone)
+
+	return errors.WithMessage(err, fmt.Sprintf("the supplied timezone %s is invalid", sc.Timezone))
+}

config/config_throttles.go

@@ -0,0 +1,27 @@
+package config
+
+type ConsoleThrottles struct {
+	// Whether or not the throttler is enabled for this instance.
+	Enabled bool `json:"enabled" yaml:"enabled" default:"true"`
+
+	// The total number of lines that can be output in a given LineResetInterval period before
+	// a warning is triggered and counted against the server.
+	Lines uint64 `json:"lines" yaml:"lines" default:"2000"`
+
+	// The total number of throttle activations that can accumulate before a server is considered
+	// to be breaching and will be stopped. This value is decremented by one every DecayInterval.
+	MaximumTriggerCount uint64 `json:"maximum_trigger_count" yaml:"maximum_trigger_count" default:"5"`
+
+	// The amount of time after which the number of lines processed is reset to 0. This runs in
+	// a constant loop and is not affected by the current console output volumes. By default, this
+	// will reset the processed line count back to 0 every 100ms.
+	LineResetInterval uint64 `json:"line_reset_interval" yaml:"line_reset_interval" default:"100"`
+
+	// The amount of time in milliseconds that must pass without an output warning being triggered
+	// before a throttle activation is decremented.
+	DecayInterval uint64 `json:"decay_interval" yaml:"decay_interval" default:"10000"`
+
+	// The amount of time that a server is allowed to be stopping for before it is terminated
+	// forcefully if it triggers output throttles.
+	StopGracePeriod uint `json:"stop_grace_period" yaml:"stop_grace_period" default:"15"`
+}

docker-compose.example.yml

@@ -1,26 +1,38 @@
-version: '3'
+version: '3.8'
+
 services:
-  daemon:
-    build: .
+  wings:
+    image: ghcr.io/pterodactyl/wings:latest
     restart: always
-    hostname: daemon
+    networks:
+      - wings0
     ports:
       - "8080:8080"
       - "2022:2022"
     tty: true
     environment:
-      - "DEBUG=false"
+      TZ: "UTC"
+      WINGS_UID: 988
+      WINGS_GID: 988
+      WINGS_USERNAME: pterodactyl
     volumes:
       - "/var/run/docker.sock:/var/run/docker.sock"
       - "/var/lib/docker/containers/:/var/lib/docker/containers/"
+      - "/etc/pterodactyl/:/etc/pterodactyl/"
       - "/var/lib/pterodactyl/:/var/lib/pterodactyl/"
-      - "/srv/daemon-data/:/srv/daemon-data/"
+      - "/var/log/pterodactyl/:/var/log/pterodactyl/"
       - "/tmp/pterodactyl/:/tmp/pterodactyl/"
-      - "/etc/timezone:/etc/timezone:ro"
-      ## Required for ssl if you user let's encrypt. uncomment to use.
-      ## - "/etc/letsencrypt/:/etc/letsencrypt/"
+      # you may need /srv/daemon-data if you are upgrading from an old daemon
+      #- "/srv/daemon-data/:/srv/daemon-data/"
+      # Required for ssl if you use let's encrypt. uncomment to use.
+      #- "/etc/letsencrypt/:/etc/letsencrypt/"
+
 networks:
-  default:
+  wings0:
+    name: wings0
+    driver: bridge
     ipam:
       config:
-        - subnet: 172.21.0.0/16
+        - subnet: "172.21.0.0/16"
+    driver_opts:
+      com.docker.network.bridge.name: wings0

environment/allocations.go

@@ -0,0 +1,102 @@
+package environment
+
+import (
+	"fmt"
+	"github.com/docker/go-connections/nat"
+	"github.com/pterodactyl/wings/config"
+	"strconv"
+)
+
+// Defines the allocations available for a given server. When using the Docker environment
+// driver these correspond to mappings for the container that allow external connections.
+type Allocations struct {
+	// Defines the default allocation that should be used for this server. This is
+	// what will be used for {SERVER_IP} and {SERVER_PORT} when modifying configuration
+	// files or the startup arguments for a server.
+	DefaultMapping struct {
+		Ip   string `json:"ip"`
+		Port int    `json:"port"`
+	} `json:"default"`
+
+	// Mappings contains all of the ports that should be assigned to a given server
+	// attached to the IP they correspond to.
+	Mappings map[string][]int `json:"mappings"`
+}
+
+// Converts the server allocation mappings into a format that can be understood by Docker. While
+// we do strive to support multiple environments, using Docker's standardized format for the
+// bindings certainly makes life a little easier for managing things.
+//
+// You'll want to use DockerBindings() if you need to re-map 127.0.0.1 to the Docker interface.
+func (a *Allocations) Bindings() nat.PortMap {
+	var out = nat.PortMap{}
+
+	for ip, ports := range a.Mappings {
+		for _, port := range ports {
+			// Skip over invalid ports.
+			if port < 1 || port > 65535 {
+				continue
+			}
+
+			binding := nat.PortBinding{
+				HostIP:   ip,
+				HostPort: strconv.Itoa(port),
+			}
+
+			tcp := nat.Port(fmt.Sprintf("%d/tcp", port))
+			udp := nat.Port(fmt.Sprintf("%d/udp", port))
+
+			out[tcp] = append(out[tcp], binding)
+			out[udp] = append(out[udp], binding)
+		}
+	}
+
+	return out
+}
+
+// Returns the bindings for the server in a way that is supported correctly by Docker. This replaces
+// any reference to 127.0.0.1 with the IP of the pterodactyl0 network interface which will allow the
+// server to operate on a local address while still being accessible by other containers.
+func (a *Allocations) DockerBindings() nat.PortMap {
+	iface := config.Get().Docker.Network.Interface
+
+	out := a.Bindings()
+	// Loop over all of the bindings for this container, and convert any that reference 127.0.0.1
+	// to use the pterodactyl0 network interface IP, as that is the true local for what people are
+	// trying to do when creating servers.
+	for p, binds := range out {
+		for i, alloc := range binds {
+			if alloc.HostIP != "127.0.0.1" {
+				continue
+			}
+
+			// If using ISPN just delete the local allocation from the server.
+			if config.Get().Docker.Network.ISPN {
+				out[p] = append(out[p][:i], out[p][i+1:]...)
+			} else {
+				out[p][i] = nat.PortBinding{
+					HostIP:   iface,
+					HostPort: alloc.HostPort,
+				}
+			}
+		}
+	}
+
+	return out
+}
+
+// Converts the server allocation mappings into a PortSet that can be understood
+// by Docker. This formatting is slightly different than "Bindings" as it should
+// return an empty struct rather than a binding.
+//
+// To accomplish this, we'll just get the values from "DockerBindings" and then set them
+// to empty structs. Because why not.
+func (a *Allocations) Exposed() nat.PortSet {
+	var out = nat.PortSet{}
+
+	for port := range a.DockerBindings() {
+		out[port] = struct{}{}
+	}
+
+	return out
+}

environment/config.go

@@ -0,0 +1,77 @@
+package environment
+
+import (
+	"sync"
+)
+
+type Settings struct {
+	Mounts      []Mount
+	Allocations Allocations
+	Limits      Limits
+}
+
+// Defines the actual configuration struct for the environment with all of the settings
+// defined within it.
+type Configuration struct {
+	mu sync.RWMutex
+
+	environmentVariables []string
+	settings             Settings
+}
+
+// Returns a new environment configuration with the given settings and environment variables
+// defined within it.
+func NewConfiguration(s Settings, envVars []string) *Configuration {
+	return &Configuration{
+		environmentVariables: envVars,
+		settings:             s,
+	}
+}
+
+// Updates the settings struct for this environment on the fly. This allows modified servers to
+// automatically push those changes to the environment.
+func (c *Configuration) SetSettings(s Settings) {
+	c.mu.Lock()
+	c.settings = s
+	c.mu.Unlock()
+}
+
+// Updates the environment variables associated with this environment by replacing the entire
+// array of them with a new one.
+func (c *Configuration) SetEnvironmentVariables(ev []string) {
+	c.mu.Lock()
+	c.environmentVariables = ev
+	c.mu.Unlock()
+}
+
+// Returns the limits assigned to this environment.
+func (c *Configuration) Limits() Limits {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
+	return c.settings.Limits
+}
+
+// Returns the allocations associated with this environment.
+func (c *Configuration) Allocations() Allocations {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
+	return c.settings.Allocations
+}
+
+// Returns all of the mounts associated with this environment.
+func (c *Configuration) Mounts() []Mount {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
+	return c.settings.Mounts
+}
+
+// Returns the environment variables associated with this instance.
+func (c *Configuration) EnvironmentVariables() []string {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
+	return c.environmentVariables
+}

environment/docker.go

@@ -2,28 +2,48 @@ package environment
 
 import (
 	"context"
+	"github.com/apex/log"
+	"strconv"
+	"sync"
 
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/network"
 	"github.com/docker/docker/client"
 	"github.com/pterodactyl/wings/config"
-	"go.uber.org/zap"
 )
 
+var _cmu sync.Mutex
+var _client *client.Client
+
+// Return a Docker client to be used throughout the codebase. Once a client has been created it
+// will be returned for all subsequent calls to this function.
+func DockerClient() (*client.Client, error) {
+	_cmu.Lock()
+	defer _cmu.Unlock()
+
+	if _client != nil {
+		return _client, nil
+	}
+
+	_client, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
+
+	return _client, err
+}
+
 // Configures the required network for the docker environment.
 func ConfigureDocker(c *config.DockerConfiguration) error {
 	// Ensure the required docker network exists on the system.
-	cli, err := client.NewClientWithOpts(client.FromEnv)
+	cli, err := DockerClient()
 	if err != nil {
 		return err
 	}
 
 	resource, err := cli.NetworkInspect(context.Background(), c.Network.Name, types.NetworkInspectOptions{})
 	if err != nil && client.IsErrNotFound(err) {
-		zap.S().Infow("creating missing pterodactyl0 interface, this could take a few seconds...")
+		log.Info("creating missing pterodactyl0 interface, this could take a few seconds...")
 		return createDockerNetwork(cli, c)
 	} else if err != nil {
-		zap.S().Fatalw("failed to create required docker network for containers", zap.Error(err))
+		log.WithField("error", err).Fatal("failed to create required docker network for containers")
 	}
 
 	switch resource.Driver {
@@ -64,7 +84,7 @@ func createDockerNetwork(cli *client.Client, c *config.DockerConfiguration) erro
 		Options: map[string]string{
 			"encryption": "false",
 			"com.docker.network.bridge.default_bridge":       "false",
-			"com.docker.network.bridge.enable_icc":           "true",
+			"com.docker.network.bridge.enable_icc":           strconv.FormatBool(c.Network.EnableICC),
 			"com.docker.network.bridge.enable_ip_masquerade": "true",
 			"com.docker.network.bridge.host_binding_ipv4":    "0.0.0.0",
 			"com.docker.network.bridge.name":                 "pterodactyl0",

environment/docker/container.go

@@ -0,0 +1,421 @@
+package docker
+
+import (
+	"bufio"
+	"context"
+	"emperror.dev/errors"
+	"encoding/json"
+	"fmt"
+	"github.com/apex/log"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/container"
+	"github.com/docker/docker/api/types/mount"
+	"github.com/docker/docker/client"
+	"github.com/docker/docker/daemon/logger/jsonfilelog"
+	"github.com/pterodactyl/wings/config"
+	"github.com/pterodactyl/wings/environment"
+	"github.com/pterodactyl/wings/system"
+	"io"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type imagePullStatus struct {
+	Status   string `json:"status"`
+	Progress string `json:"progress"`
+}
+
+// Attaches to the docker container itself and ensures that we can pipe data in and out
+// of the process stream. This should not be used for reading console data as you *will*
+// miss important output at the beginning because of the time delay with attaching to the
+// output.
+//
+// Calling this function will poll resources for the container in the background until the
+// provided context is canceled by the caller. Failure to cancel said context will cause
+// background memory leaks as the goroutine will not exit.
+func (e *Environment) Attach() error {
+	if e.IsAttached() {
+		return nil
+	}
+
+	if err := e.followOutput(); err != nil {
+		return err
+	}
+
+	opts := types.ContainerAttachOptions{
+		Stdin:  true,
+		Stdout: true,
+		Stderr: true,
+		Stream: true,
+	}
+
+	// Set the stream again with the container.
+	if st, err := e.client.ContainerAttach(context.Background(), e.Id, opts); err != nil {
+		return err
+	} else {
+		e.SetStream(&st)
+	}
+
+	go func() {
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+		defer func() {
+			e.stream.Close()
+			e.SetState(environment.ProcessOfflineState)
+			e.SetStream(nil)
+		}()
+
+		go func() {
+			if err := e.pollResources(ctx); err != nil {
+				if !errors.Is(err, context.Canceled) {
+					e.log().WithField("error", err).Error("error during environment resource polling")
+				} else {
+					e.log().Warn("stopping server resource polling: context canceled")
+				}
+			}
+		}()
+
+		// Block the completion of this routine until the container is no longer running. This allows
+		// the pollResources function to run until it needs to be stopped. Because the container
+		// can be polled for resource usage, even when sropped, we need to have this logic present
+		// in order to cancel the context and therefore stop the routine that is spawned.
+		ok, err := e.client.ContainerWait(ctx, e.Id, container.WaitConditionNotRunning)
+		select {
+		case <-ctx.Done():
+			// Do nothing, the context was canceled by a different process, there is no error
+			// to report at this point.
+			e.log().Debug("terminating ContainerWait blocking process, context canceled")
+			return
+		case _ = <-err:
+			// An error occurred with the ContainerWait call, report it here and then hope
+			// for the fucking best I guess?
+			e.log().WithField("error", err).Error("error while blocking using ContainerWait")
+			return
+		case <-ok:
+			// Do nothing, everything is running as expected. This will allow us to keep
+			// blocking the termination of this function until the container stops at which
+			// point all of our deferred functions can run.
+		}
+	}()
+
+	return nil
+}
+
+func (e *Environment) resources() container.Resources {
+	l := e.Configuration.Limits()
+
+	return container.Resources{
+		Memory:            l.BoundedMemoryLimit(),
+		MemoryReservation: l.MemoryLimit * 1_000_000,
+		MemorySwap:        l.ConvertedSwap(),
+		CPUQuota:          l.ConvertedCpuLimit(),
+		CPUPeriod:         100_000,
+		CPUShares:         1024,
+		BlkioWeight:       l.IoWeight,
+		OomKillDisable:    &l.OOMDisabled,
+		CpusetCpus:        l.Threads,
+	}
+}
+
+// Performs an in-place update of the Docker container's resource limits without actually
+// making any changes to the operational state of the container. This allows memory, cpu,
+// and IO limitations to be adjusted on the fly for individual instances.
+func (e *Environment) InSituUpdate() error {
+	if _, err := e.client.ContainerInspect(context.Background(), e.Id); err != nil {
+		// If the container doesn't exist for some reason there really isn't anything
+		// we can do to fix that in this process (it doesn't make sense at least). In those
+		// cases just return without doing anything since we still want to save the configuration
+		// to the disk.
+		//
+		// We'll let a boot process make modifications to the container if needed at this point.
+		if client.IsErrNotFound(err) {
+			return nil
+		}
+
+		return err
+	}
+
+	u := container.UpdateConfig{
+		Resources: e.resources(),
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
+	defer cancel()
+	if _, err := e.client.ContainerUpdate(ctx, e.Id, u); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Creates a new container for the server using all of the data that is currently
+// available for it. If the container already exists it will be returnee.
+func (e *Environment) Create() error {
+	// If the container already exists don't hit the user with an error, just return
+	// the current information about it which is what we would do when creating the
+	// container anyways.
+	if _, err := e.client.ContainerInspect(context.Background(), e.Id); err == nil {
+		return nil
+	} else if !client.IsErrNotFound(err) {
+		return err
+	}
+
+	// Try to pull the requested image before creating the container.
+	if err := e.ensureImageExists(e.meta.Image); err != nil {
+		return err
+	}
+
+	a := e.Configuration.Allocations()
+
+	evs := e.Configuration.EnvironmentVariables()
+	for i, v := range evs {
+		// Convert 127.0.0.1 to the pterodactyl0 network interface if the environment is Docker
+		// so that the server operates as expected.
+		if v == "SERVER_IP=127.0.0.1" {
+			evs[i] = "SERVER_IP=" + config.Get().Docker.Network.Interface
+		}
+	}
+
+	conf := &container.Config{
+		Hostname:     e.Id,
+		Domainname:   config.Get().Docker.Domainname,
+		User:         strconv.Itoa(config.Get().System.User.Uid),
+		AttachStdin:  true,
+		AttachStdout: true,
+		AttachStderr: true,
+		OpenStdin:    true,
+		Tty:          true,
+		ExposedPorts: a.Exposed(),
+		Image:        e.meta.Image,
+		Env:          e.Configuration.EnvironmentVariables(),
+		Labels: map[string]string{
+			"Service":       "Pterodactyl",
+			"ContainerType": "server_process",
+		},
+	}
+
+	tmpfsSize := strconv.Itoa(int(config.Get().Docker.TmpfsSize))
+
+	hostConf := &container.HostConfig{
+		PortBindings: a.DockerBindings(),
+
+		// Configure the mounts for this container. First mount the server data directory
+		// into the container as a r/w bind.
+		Mounts: e.convertMounts(),
+
+		// Configure the /tmp folder mapping in containers. This is necessary for some
+		// games that need to make use of it for downloads and other installation processes.
+		Tmpfs: map[string]string{
+			"/tmp": "rw,exec,nosuid,size=" + tmpfsSize + "M",
+		},
+
+		// Define resource limits for the container based on the data passed through
+		// from the Panel.
+		Resources: e.resources(),
+
+		DNS: config.Get().Docker.Network.Dns,
+
+		// Configure logging for the container to make it easier on the Daemon to grab
+		// the server output. Ensure that we don't use too much space on the host machine
+		// since we only need it for the last few hundred lines of output and don't care
+		// about anything else in it.
+		LogConfig: container.LogConfig{
+			Type: jsonfilelog.Name,
+			Config: map[string]string{
+				"max-size": "5m",
+				"max-file": "1",
+				"compress": "false",
+			},
+		},
+
+		SecurityOpt:    []string{"no-new-privileges"},
+		ReadonlyRootfs: true,
+		CapDrop: []string{
+			"setpcap", "mknod", "audit_write", "net_raw", "dac_override",
+			"fowner", "fsetid", "net_bind_service", "sys_chroot", "setfcap",
+		},
+		NetworkMode: container.NetworkMode(config.Get().Docker.Network.Mode),
+	}
+
+	if _, err := e.client.ContainerCreate(context.Background(), conf, hostConf, nil, nil, e.Id); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (e *Environment) convertMounts() []mount.Mount {
+	var out []mount.Mount
+
+	for _, m := range e.Configuration.Mounts() {
+		out = append(out, mount.Mount{
+			Type:     mount.TypeBind,
+			Source:   m.Source,
+			Target:   m.Target,
+			ReadOnly: m.ReadOnly,
+		})
+	}
+
+	return out
+}
+
+// Remove the Docker container from the machine. If the container is currently running
+// it will be forcibly stopped by Docker.
+func (e *Environment) Destroy() error {
+	// We set it to stopping than offline to prevent crash detection from being triggered.
+	e.SetState(environment.ProcessStoppingState)
+
+	err := e.client.ContainerRemove(context.Background(), e.Id, types.ContainerRemoveOptions{
+		RemoveVolumes: true,
+		RemoveLinks:   false,
+		Force:         true,
+	})
+
+	// Don't trigger a destroy failure if we try to delete a container that does not
+	// exist on the system. We're just a step ahead of ourselves in that case.
+	//
+	// @see https://github.com/pterodactyl/panel/issues/2001
+	if err != nil && client.IsErrNotFound(err) {
+		return nil
+	}
+
+	e.SetState(environment.ProcessOfflineState)
+
+	return err
+}
+
+// Attaches to the log for the container. This avoids us missing crucial output that
+// happens in the split seconds before the code moves from 'Starting' to 'Attaching'
+// on the process.
+func (e *Environment) followOutput() error {
+	if exists, err := e.Exists(); !exists {
+		if err != nil {
+			return err
+		}
+		return errors.New(fmt.Sprintf("no such container: %s", e.Id))
+	}
+
+	opts := types.ContainerLogsOptions{
+		ShowStderr: true,
+		ShowStdout: true,
+		Follow:     true,
+		Since:      time.Now().Format(time.RFC3339),
+	}
+
+	reader, err := e.client.ContainerLogs(context.Background(), e.Id, opts)
+	if err != nil {
+		return err
+	}
+	go func(reader io.ReadCloser) {
+		defer reader.Close()
+		evts := e.Events()
+		err := system.ScanReader(reader, func(line string) {
+			evts.Publish(environment.ConsoleOutputEvent, line)
+		})
+		if err != nil && err != io.EOF {
+			log.WithField("error", err).WithField("container_id", e.Id).Warn("error processing scanner line in console output")
+		}
+	}(reader)
+	return nil
+}
+
+// Pulls the image from Docker. If there is an error while pulling the image from the source
+// but the image already exists locally, we will report that error to the logger but continue
+// with the process.
+//
+// The reasoning behind this is that Quay has had some serious outages as of late, and we don't
+// need to block all of the servers from booting just because of that. I'd imagine in a lot of
+// cases an outage shouldn't affect users too badly. It'll at least keep existing servers working
+// correctly if anything.
+func (e *Environment) ensureImageExists(image string) error {
+	e.Events().Publish(environment.DockerImagePullStarted, "")
+	defer e.Events().Publish(environment.DockerImagePullCompleted, "")
+
+	// Images prefixed with a ~ are local images that we do not need to try and pull.
+	if strings.HasPrefix(image, "~") {
+		return nil
+	}
+
+	// Give it up to 15 minutes to pull the image. I think this should cover 99.8% of cases where an
+	// image pull might fail. I can't imagine it will ever take more than 15 minutes to fully pull
+	// an image. Let me know when I am inevitably wrong here...
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute*15)
+	defer cancel()
+
+	// Get a registry auth configuration from the config.
+	var registryAuth *config.RegistryConfiguration
+	for registry, c := range config.Get().Docker.Registries {
+		if !strings.HasPrefix(image, registry) {
+			continue
+		}
+
+		log.WithField("registry", registry).Debug("using authentication for registry")
+		registryAuth = &c
+		break
+	}
+
+	// Get the ImagePullOptions.
+	imagePullOptions := types.ImagePullOptions{All: false}
+	if registryAuth != nil {
+		b64, err := registryAuth.Base64()
+		if err != nil {
+			log.WithError(err).Error("failed to get registry auth credentials")
+		}
+
+		// b64 is a string so if there is an error it will just be empty, not nil.
+		imagePullOptions.RegistryAuth = b64
+	}
+
+	out, err := e.client.ImagePull(ctx, image, imagePullOptions)
+	if err != nil {
+		images, ierr := e.client.ImageList(ctx, types.ImageListOptions{})
+		if ierr != nil {
+			// Well damn, something has gone really wrong here, just go ahead and abort there
+			// isn't much anything we can do to try and self-recover from this.
+			return ierr
+		}
+
+		for _, img := range images {
+			for _, t := range img.RepoTags {
+				if t != image {
+					continue
+				}
+
+				log.WithFields(log.Fields{
+					"image":        image,
+					"container_id": e.Id,
+					"err":          err.Error(),
+				}).Warn("unable to pull requested image from remote source, however the image exists locally")
+
+				// Okay, we found a matching container image, in that case just go ahead and return
+				// from this function, since there is nothing else we need to do here.
+				return nil
+			}
+		}
+
+		return err
+	}
+	defer out.Close()
+
+	log.WithField("image", image).Debug("pulling docker image... this could take a bit of time")
+
+	// I'm not sure what the best approach here is, but this will block execution until the image
+	// is done being pulled, which is what we need.
+	scanner := bufio.NewScanner(out)
+	for scanner.Scan() {
+		s := imagePullStatus{}
+		fmt.Println(scanner.Text())
+		if err := json.Unmarshal(scanner.Bytes(), &s); err == nil {
+			e.Events().Publish(environment.DockerImagePullStatus, s.Status+" "+s.Progress)
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return err
+	}
+
+	log.WithField("image", image).Debug("completed docker image pull")
+
+	return nil
+}

environment/docker/environment.go

@@ -0,0 +1,185 @@
+package docker
+
+import (
+	"context"
+	"github.com/apex/log"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/client"
+	"github.com/pterodactyl/wings/api"
+	"github.com/pterodactyl/wings/environment"
+	"github.com/pterodactyl/wings/events"
+	"github.com/pterodactyl/wings/system"
+	"io"
+	"sync"
+)
+
+type Metadata struct {
+	Image string
+	Stop  api.ProcessStopConfiguration
+}
+
+// Ensure that the Docker environment is always implementing all of the methods
+// from the base environment interface.
+var _ environment.ProcessEnvironment = (*Environment)(nil)
+
+type Environment struct {
+	mu      sync.RWMutex
+	eventMu sync.Once
+
+	// The public identifier for this environment. In this case it is the Docker container
+	// name that will be used for all instances created under it.
+	Id string
+
+	// The environment configuration.
+	Configuration *environment.Configuration
+
+	meta *Metadata
+
+	// The Docker client being used for this instance.
+	client *client.Client
+
+	// Controls the hijacked response stream which exists only when we're attached to
+	// the running container instance.
+	stream *types.HijackedResponse
+
+	// Holds the stats stream used by the polling commands so that we can easily close it out.
+	stats io.ReadCloser
+
+	emitter *events.EventBus
+
+	// Tracks the environment state.
+	st *system.AtomicString
+}
+
+// Creates a new base Docker environment. The ID passed through will be the ID that is used to
+// reference the container from here on out. This should be unique per-server (we use the UUID
+// by default). The container does not need to exist at this point.
+func New(id string, m *Metadata, c *environment.Configuration) (*Environment, error) {
+	cli, err := environment.DockerClient()
+	if err != nil {
+		return nil, err
+	}
+
+	e := &Environment{
+		Id:            id,
+		Configuration: c,
+		meta:          m,
+		client:        cli,
+		st:            system.NewAtomicString(environment.ProcessOfflineState),
+	}
+
+	return e, nil
+}
+
+func (e *Environment) log() *log.Entry {
+	return log.WithField("environment", e.Type()).WithField("container_id", e.Id)
+}
+
+func (e *Environment) Type() string {
+	return "docker"
+}
+
+// Set if this process is currently attached to the process.
+func (e *Environment) SetStream(s *types.HijackedResponse) {
+	e.mu.Lock()
+	e.stream = s
+	e.mu.Unlock()
+}
+
+// Determine if the this process is currently attached to the container.
+func (e *Environment) IsAttached() bool {
+	e.mu.RLock()
+	defer e.mu.RUnlock()
+
+	return e.stream != nil
+}
+
+func (e *Environment) Events() *events.EventBus {
+	e.eventMu.Do(func() {
+		e.emitter = events.New()
+	})
+	return e.emitter
+}
+
+// Determines if the container exists in this environment. The ID passed through should be the
+// server UUID since containers are created utilizing the server UUID as the name and docker
+// will work fine when using the container name as the lookup parameter in addition to the longer
+// ID auto-assigned when the container is created.
+func (e *Environment) Exists() (bool, error) {
+	_, err := e.client.ContainerInspect(context.Background(), e.Id)
+
+	if err != nil {
+		// If this error is because the container instance wasn't found via Docker we
+		// can safely ignore the error and just return false.
+		if client.IsErrNotFound(err) {
+			return false, nil
+		}
+
+		return false, err
+	}
+
+	return true, nil
+}
+
+// Determines if the server's docker container is currently running. If there is no container
+// present, an error will be raised (since this shouldn't be a case that ever happens under
+// correctly developed circumstances).
+//
+// You can confirm if the instance wasn't found by using client.IsErrNotFound from the Docker
+// API.
+//
+// @see docker/client/errors.go
+func (e *Environment) IsRunning() (bool, error) {
+	c, err := e.client.ContainerInspect(context.Background(), e.Id)
+	if err != nil {
+		return false, err
+	}
+
+	return c.State.Running, nil
+}
+
+// Determine the container exit state and return the exit code and whether or not
+// the container was killed by the OOM killer.
+func (e *Environment) ExitState() (uint32, bool, error) {
+	c, err := e.client.ContainerInspect(context.Background(), e.Id)
+	if err != nil {
+		// I'm not entirely sure how this can happen to be honest. I tried deleting a
+		// container _while_ a server was running and wings gracefully saw the crash and
+		// created a new container for it.
+		//
+		// However, someone reported an error in Discord about this scenario happening,
+		// so I guess this should prevent it? They didn't tell me how they caused it though
+		// so that's a mystery that will have to go unsolved.
+		//
+		// @see https://github.com/pterodactyl/panel/issues/2003
+		if client.IsErrNotFound(err) {
+			return 1, false, nil
+		}
+
+		return 0, false, err
+	}
+
+	return uint32(c.State.ExitCode), c.State.OOMKilled, nil
+}
+
+// Returns the environment configuration allowing a process to make modifications of the
+// environment on the fly.
+func (e *Environment) Config() *environment.Configuration {
+	e.mu.RLock()
+	defer e.mu.RUnlock()
+
+	return e.Configuration
+}
+
+// Sets the stop configuration for the environment.
+func (e *Environment) SetStopConfiguration(c api.ProcessStopConfiguration) {
+	e.mu.Lock()
+	e.meta.Stop = c
+	e.mu.Unlock()
+}
+
+func (e *Environment) SetImage(i string) {
+	e.mu.Lock()
+	e.meta.Image = i
+	e.mu.Unlock()
+}

environment/docker/power.go

@@ -0,0 +1,245 @@
+package docker
+
+import (
+	"context"
+	"emperror.dev/errors"
+	"github.com/apex/log"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/container"
+	"github.com/docker/docker/client"
+	"github.com/pterodactyl/wings/api"
+	"github.com/pterodactyl/wings/environment"
+	"os"
+	"strings"
+	"time"
+)
+
+// Run before the container starts and get the process configuration from the Panel.
+// This is important since we use this to check configuration files as well as ensure
+// we always have the latest version of an egg available for server processes.
+//
+// This process will also confirm that the server environment exists and is in a bootable
+// state. This ensures that unexpected container deletion while Wings is running does
+// not result in the server becoming unbootable.
+func (e *Environment) OnBeforeStart() error {
+	// Always destroy and re-create the server container to ensure that synced data from
+	// the Panel is usee.
+	if err := e.client.ContainerRemove(context.Background(), e.Id, types.ContainerRemoveOptions{RemoveVolumes: true}); err != nil {
+		if !client.IsErrNotFound(err) {
+			return errors.WithMessage(err, "failed to remove server docker container during pre-boot")
+		}
+	}
+
+	// The Create() function will check if the container exists in the first place, and if
+	// so just silently return without an error. Otherwise, it will try to create the necessary
+	// container and data storage directory.
+	//
+	// This won't actually run an installation process however, it is just here to ensure the
+	// environment gets created properly if it is missing and the server is started. We're making
+	// an assumption that all of the files will still exist at this point.
+	if err := e.Create(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Starts the server environment and begins piping output to the event listeners for the
+// console. If a container does not exist, or needs to be rebuilt that will happen in the
+// call to OnBeforeStart().
+func (e *Environment) Start() error {
+	sawError := false
+	// If sawError is set to true there was an error somewhere in the pipeline that
+	// got passed up, but we also want to ensure we set the server to be offline at
+	// that point.
+	defer func() {
+		if sawError {
+			// If we don't set it to stopping first, you'll trigger crash detection which
+			// we don't want to do at this point since it'll just immediately try to do the
+			// exact same action that lead to it crashing in the first place...
+			e.SetState(environment.ProcessStoppingState)
+			e.SetState(environment.ProcessOfflineState)
+		}
+	}()
+
+	if c, err := e.client.ContainerInspect(context.Background(), e.Id); err != nil {
+		// Do nothing if the container is not found, we just don't want to continue
+		// to the next block of code here. This check was inlined here to guard against
+		// a nil-pointer when checking c.State below.
+		//
+		// @see https://github.com/pterodactyl/panel/issues/2000
+		if !client.IsErrNotFound(err) {
+			return err
+		}
+	} else {
+		// If the server is running update our internal state and continue on with the attach.
+		if c.State.Running {
+			e.SetState(environment.ProcessRunningState)
+
+			return e.Attach()
+		}
+
+		// Truncate the log file so we don't end up outputting a bunch of useless log information
+		// to the websocket and whatnot. Check first that the path and file exist before trying
+		// to truncate them.
+		if _, err := os.Stat(c.LogPath); err == nil {
+			if err := os.Truncate(c.LogPath, 0); err != nil {
+				return err
+			}
+		}
+	}
+
+	e.SetState(environment.ProcessStartingState)
+
+	// Set this to true for now, we will set it to false once we reach the
+	// end of this chain.
+	sawError = true
+
+	// Run the before start function and wait for it to finish. This will validate that the container
+	// exists on the system, and rebuild the container if that is required for server booting to
+	// occur.
+	if err := e.OnBeforeStart(); err != nil {
+		return err
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
+	defer cancel()
+
+	if err := e.client.ContainerStart(ctx, e.Id, types.ContainerStartOptions{}); err != nil {
+		return err
+	}
+
+	// No errors, good to continue through.
+	sawError = false
+
+	return e.Attach()
+}
+
+// Stops the container that the server is running in. This will allow up to 30 seconds to pass
+// before the container is forcefully terminated if we are trying to stop it without using a command
+// sent into the instance.
+//
+// You most likely want to be using WaitForStop() rather than this function, since this will return
+// as soon as the command is sent, rather than waiting for the process to be completed stopped.
+func (e *Environment) Stop() error {
+	e.mu.RLock()
+	s := e.meta.Stop
+	e.mu.RUnlock()
+
+	if s.Type == "" || s.Type == api.ProcessStopSignal {
+		if s.Type == "" {
+			log.WithField("container_id", e.Id).Warn("no stop configuration detected for environment, using termination procedure")
+		}
+
+		return e.Terminate(os.Kill)
+	}
+
+	// If the process is already offline don't switch it back to stopping. Just leave it how
+	// it is and continue through to the stop handling for the process.
+	if e.st.Load() != environment.ProcessOfflineState {
+		e.SetState(environment.ProcessStoppingState)
+	}
+
+	// Only attempt to send the stop command to the instance if we are actually attached to
+	// the instance. If we are not for some reason, just send the container stop event.
+	if e.IsAttached() && s.Type == api.ProcessStopCommand {
+		return e.SendCommand(s.Value)
+	}
+
+	t := time.Second * 30
+
+	if err := e.client.ContainerStop(context.Background(), e.Id, &t); err != nil {
+		// If the container does not exist just mark the process as stopped and return without
+		// an error.
+		if client.IsErrNotFound(err) {
+			e.SetStream(nil)
+			e.SetState(environment.ProcessOfflineState)
+
+			return nil
+		}
+
+		return err
+	}
+
+	return nil
+}
+
+// Attempts to gracefully stop a server using the defined stop command. If the server
+// does not stop after seconds have passed, an error will be returned, or the instance
+// will be terminated forcefully depending on the value of the second argument.
+func (e *Environment) WaitForStop(seconds uint, terminate bool) error {
+	if err := e.Stop(); err != nil {
+		return err
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Duration(seconds)*time.Second)
+	defer cancel()
+
+	// Block the return of this function until the container as been marked as no
+	// longer running. If this wait does not end by the time seconds have passed,
+	// attempt to terminate the container, or return an error.
+	ok, errChan := e.client.ContainerWait(ctx, e.Id, container.WaitConditionNotRunning)
+	select {
+	case <-ctx.Done():
+		if ctxErr := ctx.Err(); ctxErr != nil {
+			if terminate {
+				log.WithField("container_id", e.Id).Info("server did not stop in time, executing process termination")
+
+				return e.Terminate(os.Kill)
+			}
+
+			return ctxErr
+		}
+	case err := <-errChan:
+		if err != nil {
+			if terminate {
+				l := log.WithField("container_id", e.Id)
+				if errors.Is(err, context.DeadlineExceeded) {
+					l.Warn("deadline exceeded for container stop; terminating process")
+				} else {
+					l.WithField("error", err).Warn("error while waiting for container stop; terminating process")
+				}
+
+				return e.Terminate(os.Kill)
+			}
+
+			return err
+		}
+	case <-ok:
+	}
+
+	return nil
+}
+
+// Forcefully terminates the container using the signal passed through.
+func (e *Environment) Terminate(signal os.Signal) error {
+	c, err := e.client.ContainerInspect(context.Background(), e.Id)
+	if err != nil {
+		return err
+	}
+
+	if !c.State.Running {
+		// If the container is not running but we're not already in a stopped state go ahead
+		// and update things to indicate we should be completely stopped now. Set to stopping
+		// first so crash detection is not triggered.
+		if e.st.Load() != environment.ProcessOfflineState {
+			e.SetState(environment.ProcessStoppingState)
+			e.SetState(environment.ProcessOfflineState)
+		}
+
+		return nil
+	}
+
+	// We set it to stopping than offline to prevent crash detection from being triggered.
+	e.SetState(environment.ProcessStoppingState)
+
+	sig := strings.TrimSuffix(strings.TrimPrefix(signal.String(), "signal "), "ed")
+
+	if err := e.client.ContainerKill(context.Background(), e.Id, sig); err != nil {
+		return err
+	}
+
+	e.SetState(environment.ProcessOfflineState)
+
+	return nil
+}

environment/docker/state.go

@@ -0,0 +1,29 @@
+package docker
+
+import (
+	"emperror.dev/errors"
+	"fmt"
+	"github.com/pterodactyl/wings/environment"
+)
+
+func (e *Environment) State() string {
+	return e.st.Load()
+}
+
+// Sets the state of the environment. This emits an event that server's can hook into to
+// take their own actions and track their own state based on the environment.
+func (e *Environment) SetState(state string) {
+	if state != environment.ProcessOfflineState &&
+		state != environment.ProcessStartingState &&
+		state != environment.ProcessRunningState &&
+		state != environment.ProcessStoppingState {
+		panic(errors.New(fmt.Sprintf("invalid server state received: %s", state)))
+	}
+
+	// Emit the event to any listeners that are currently registered.
+	if e.State() != state {
+		// If the state changed make sure we update the internal tracking to note that.
+		e.st.Store(state)
+		e.Events().Publish(environment.StateChangeEvent, state)
+	}
+}

environment/docker/stats.go

@@ -0,0 +1,116 @@
+package docker
+
+import (
+	"context"
+	"emperror.dev/errors"
+	"encoding/json"
+	"github.com/docker/docker/api/types"
+	"github.com/pterodactyl/wings/environment"
+	"io"
+	"math"
+)
+
+// Attach to the instance and then automatically emit an event whenever the resource usage for the
+// server process changes.
+func (e *Environment) pollResources(ctx context.Context) error {
+	if e.st.Load() == environment.ProcessOfflineState {
+		return errors.New("cannot enable resource polling on a stopped server")
+	}
+
+	e.log().Info("starting resource polling for container")
+	defer e.log().Debug("stopped resource polling for container")
+
+	stats, err := e.client.ContainerStats(ctx, e.Id, true)
+	if err != nil {
+		return err
+	}
+	defer stats.Body.Close()
+
+	dec := json.NewDecoder(stats.Body)
+	for {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+			var v types.StatsJSON
+			if err := dec.Decode(&v); err != nil {
+				if err != io.EOF && !errors.Is(err, context.Canceled) {
+					e.log().WithField("error", err).Warn("error while processing Docker stats output for container")
+				} else {
+					e.log().Debug("io.EOF encountered during stats decode, stopping polling...")
+				}
+				return nil
+			}
+
+			// Disable collection if the server is in an offline state and this process is still running.
+			if e.st.Load() == environment.ProcessOfflineState {
+				e.log().Debug("process in offline state while resource polling is still active; stopping poll")
+				return nil
+			}
+
+			st := environment.Stats{
+				Memory:      calculateDockerMemory(v.MemoryStats),
+				MemoryLimit: v.MemoryStats.Limit,
+				CpuAbsolute: calculateDockerAbsoluteCpu(v.PreCPUStats, v.CPUStats),
+				Network:     environment.NetworkStats{},
+			}
+
+			for _, nw := range v.Networks {
+				st.Network.RxBytes += nw.RxBytes
+				st.Network.TxBytes += nw.TxBytes
+			}
+
+			if b, err := json.Marshal(st); err != nil {
+				e.log().WithField("error", err).Warn("error while marshaling stats object for environment")
+			} else {
+				e.Events().Publish(environment.ResourceEvent, string(b))
+			}
+		}
+	}
+}
+
+// The "docker stats" CLI call does not return the same value as the types.MemoryStats.Usage
+// value which can be rather confusing to people trying to compare panel usage to
+// their stats output.
+//
+// This math is straight up lifted from their CLI repository in order to show the same
+// values to avoid people bothering me about it. It should also reflect a slightly more
+// correct memory value anyways.
+//
+// @see https://github.com/docker/cli/blob/96e1d1d6/cli/command/container/stats_helpers.go#L227-L249
+func calculateDockerMemory(stats types.MemoryStats) uint64 {
+	if v, ok := stats.Stats["total_inactive_file"]; ok && v < stats.Usage {
+		return stats.Usage - v
+	}
+
+	if v := stats.Stats["inactive_file"]; v < stats.Usage {
+		return stats.Usage - v
+	}
+
+	return stats.Usage
+}
+
+// Calculates the absolute CPU usage used by the server process on the system, not constrained
+// by the defined CPU limits on the container.
+//
+// @see https://github.com/docker/cli/blob/aa097cf1aa19099da70930460250797c8920b709/cli/command/container/stats_helpers.go#L166
+func calculateDockerAbsoluteCpu(pStats types.CPUStats, stats types.CPUStats) float64 {
+	// Calculate the change in CPU usage between the current and previous reading.
+	cpuDelta := float64(stats.CPUUsage.TotalUsage) - float64(pStats.CPUUsage.TotalUsage)
+
+	// Calculate the change for the entire system's CPU usage between current and previous reading.
+	systemDelta := float64(stats.SystemUsage) - float64(pStats.SystemUsage)
+
+	// Calculate the total number of CPU cores being used.
+	cpus := float64(stats.OnlineCPUs)
+	if cpus == 0.0 {
+		cpus = float64(len(stats.CPUUsage.PercpuUsage))
+	}
+
+	percent := 0.0
+	if systemDelta > 0.0 && cpuDelta > 0.0 {
+		percent = (cpuDelta / systemDelta) * cpus * 100.0
+	}
+
+	return math.Round(percent*1000) / 1000
+}

environment/docker/stream.go

@@ -0,0 +1,99 @@
+package docker
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"emperror.dev/errors"
+	"encoding/json"
+	"github.com/docker/docker/api/types"
+	"github.com/pterodactyl/wings/environment"
+	"strconv"
+)
+
+type dockerLogLine struct {
+	Log string `json:"log"`
+}
+
+var ErrNotAttached = errors.New("not attached to instance")
+
+func (e *Environment) setStream(s *types.HijackedResponse) {
+	e.mu.Lock()
+	e.stream = s
+	e.mu.Unlock()
+}
+
+// Sends the specified command to the stdin of the running container instance. There is no
+// confirmation that this data is sent successfully, only that it gets pushed into the stdin.
+func (e *Environment) SendCommand(c string) error {
+	if !e.IsAttached() {
+		return ErrNotAttached
+	}
+
+	e.mu.RLock()
+	defer e.mu.RUnlock()
+
+	// If the command being processed is the same as the process stop command then we want to mark
+	// the server as entering the stopping state otherwise the process will stop and Wings will think
+	// it has crashed and attempt to restart it.
+	if e.meta.Stop.Type == "command" && c == e.meta.Stop.Value {
+		e.SetState(environment.ProcessStoppingState)
+	}
+
+	_, err := e.stream.Conn.Write([]byte(c + "\n"))
+
+	return err
+}
+
+// Reads the log file for the server. This does not care if the server is running or not, it will
+// simply try to read the last X bytes of the file and return them.
+func (e *Environment) Readlog(lines int) ([]string, error) {
+	r, err := e.client.ContainerLogs(context.Background(), e.Id, types.ContainerLogsOptions{
+		ShowStdout: true,
+		ShowStderr: true,
+		Tail:       strconv.Itoa(lines),
+	})
+	if err != nil {
+		return nil, err
+	}
+	defer r.Close()
+
+	var out []string
+
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		out = append(out, scanner.Text())
+	}
+
+	return out, nil
+}
+
+// Docker stores the logs for server output in a JSON format. This function will iterate over the JSON
+// that was read from the log file and parse it into a more human readable format.
+func (e *Environment) parseLogToStrings(b []byte) ([]string, error) {
+	var hasError = false
+	var out []string
+
+	scanner := bufio.NewScanner(bytes.NewReader(b))
+	for scanner.Scan() {
+		var l dockerLogLine
+
+		// Unmarshal the contents and allow up to a single error before bailing out of the process. We
+		// do this because if you're arbitrarily reading a length of the file you'll likely end up
+		// with the first line in the output being improperly formatted JSON. In those cases we want to
+		// just skip over it. However if we see another error we're going to bail out because that is an
+		// abnormal situation.
+		if err := json.Unmarshal([]byte(scanner.Text()), &l); err != nil {
+			if hasError {
+				return nil, err
+			}
+
+			hasError = true
+			continue
+		}
+
+		out = append(out, l.Log)
+	}
+
+	return out, nil
+}

environment/environment.go

@@ -1,15 +1,45 @@
-package server
+package environment
 
 import (
+	"github.com/pterodactyl/wings/events"
 	"os"
 )
 
+const (
+	ConsoleOutputEvent       = "console output"
+	StateChangeEvent         = "state change"
+	ResourceEvent            = "resources"
+	DockerImagePullStarted   = "docker image pull started"
+	DockerImagePullStatus    = "docker image pull status"
+	DockerImagePullCompleted = "docker image pull completed"
+)
+
+const (
+	ProcessOfflineState  = "offline"
+	ProcessStartingState = "starting"
+	ProcessRunningState  = "running"
+	ProcessStoppingState = "stopping"
+)
+
 // Defines the basic interface that all environments need to implement so that
 // a server can be properly controlled.
-type Environment interface {
+type ProcessEnvironment interface {
 	// Returns the name of the environment.
 	Type() string
 
+	// Returns the environment configuration to the caller.
+	Config() *Configuration
+
+	// Returns an event emitter instance that can be hooked into to listen for different
+	// events that are fired by the environment. This should not allow someone to publish
+	// events, only subscribe to them.
+	Events() *events.EventBus
+
+	// Determines if the server instance exists. For example, in a docker environment
+	// this should confirm that the container is created and in a bootable state. In
+	// a basic CLI environment this can probably just return true right away.
+	Exists() (bool, error)
+
 	// Determines if the environment is currently active and running a server process
 	// for this specific server instance.
 	IsRunning() (bool, error)
@@ -34,12 +64,7 @@ type Environment interface {
 	// Waits for a server instance to stop gracefully. If the server is still detected
 	// as running after seconds, an error will be returned, or the server will be terminated
 	// depending on the value of the second argument.
-	WaitForStop(seconds int, terminate bool) error
-
-	// Determines if the server instance exists. For example, in a docker environment
-	// this should confirm that the container is created and in a bootable state. In
-	// a basic CLI environment this can probably just return true right away.
-	Exists() (bool, error)
+	WaitForStop(seconds uint, terminate bool) error
 
 	// Terminates a running server instance using the provided signal. If the server
 	// is not running no error should be returned.
@@ -63,22 +88,18 @@ type Environment interface {
 	// send data into the environment's stdin.
 	Attach() error
 
-	// Follows the output from the server console and will begin piping the output to
-	// the server's emitter.
-	FollowConsoleOutput() error
-
 	// Sends the provided command to the running server instance.
 	SendCommand(string) error
 
 	// Reads the log file for the process from the end backwards until the provided
-	// number of bytes is met.
-	Readlog(int64) ([]string, error)
+	// number of lines is met.
+	Readlog(int) ([]string, error)
 
-	// Polls the given environment for resource usage of the server when the process
-	// is running.
-	EnableResourcePolling() error
+	// Returns the current state of the environment.
+	State() string
 
-	// Disables the polling operation for resource usage and sets the required values
-	// to 0 in the server resource usage struct.
-	DisableResourcePolling() error
+	// Sets the current state of the environment. In general you should let the environment
+	// handle this itself, but there are some scenarios where it is helpful for the server
+	// to update the state externally (e.g. starting -> started).
+	SetState(string)
 }

environment/settings.go

@@ -0,0 +1,131 @@
+package environment
+
+import (
+	"fmt"
+	"github.com/apex/log"
+	"math"
+	"strconv"
+)
+
+type Mount struct {
+	// In Docker environments this makes no difference, however in a non-Docker environment you
+	// should treat the "Default" mount as the root directory for the server. All other mounts
+	// are just in addition to that one, and generally things like shared maps or timezone data.
+	Default bool `json:"-"`
+
+	// The target path on the system. This is "/home/container" for all server's Default mount
+	// but in non-container environments you can likely ignore the target and just work with the
+	// source.
+	Target string `json:"target"`
+
+	// The directory from which the files will be read. In Docker environments this is the directory
+	// that we're mounting into the container at the Target location.
+	Source string `json:"source"`
+
+	// Whether or not the directory is being mounted as read-only. It is up to the environment to
+	// handle this value correctly and ensure security expectations are met with its usage.
+	ReadOnly bool `json:"read_only"`
+}
+
+// The build settings for a given server that impact docker container creation and
+// resource limits for a server instance.
+type Limits struct {
+	// The total amount of memory in megabytes that this server is allowed to
+	// use on the host system.
+	MemoryLimit int64 `json:"memory_limit"`
+
+	// The amount of additional swap space to be provided to a container instance.
+	Swap int64 `json:"swap"`
+
+	// The relative weight for IO operations in a container. This is relative to other
+	// containers on the system and should be a value between 10 and 1000.
+	IoWeight uint16 `json:"io_weight"`
+
+	// The percentage of CPU that this instance is allowed to consume relative to
+	// the host. A value of 200% represents complete utilization of two cores. This
+	// should be a value between 1 and THREAD_COUNT * 100.
+	CpuLimit int64 `json:"cpu_limit"`
+
+	// The amount of disk space in megabytes that a server is allowed to use.
+	DiskSpace int64 `json:"disk_space"`
+
+	// Sets which CPU threads can be used by the docker instance.
+	Threads string `json:"threads"`
+
+	OOMDisabled bool `json:"oom_disabled"`
+}
+
+// Converts the CPU limit for a server build into a number that can be better understood
+// by the Docker environment. If there is no limit set, return -1 which will indicate to
+// Docker that it has unlimited CPU quota.
+func (r *Limits) ConvertedCpuLimit() int64 {
+	if r.CpuLimit == 0 {
+		return -1
+	}
+
+	return r.CpuLimit * 1000
+}
+
+// Set the hard limit for memory usage to be 5% more than the amount of memory assigned to
+// the server. If the memory limit for the server is < 4G, use 10%, if less than 2G use
+// 15%. This avoids unexpected crashes from processes like Java which run over the limit.
+func (r *Limits) MemoryOverheadMultiplier() float64 {
+	if r.MemoryLimit <= 2048 {
+		return 1.15
+	} else if r.MemoryLimit <= 4096 {
+		return 1.10
+	}
+
+	return 1.05
+}
+
+func (r *Limits) BoundedMemoryLimit() int64 {
+	return int64(math.Round(float64(r.MemoryLimit) * r.MemoryOverheadMultiplier() * 1_000_000))
+}
+
+// Returns the amount of swap available as a total in bytes. This is returned as the amount
+// of memory available to the server initially, PLUS the amount of additional swap to include
+// which is the format used by Docker.
+func (r *Limits) ConvertedSwap() int64 {
+	if r.Swap < 0 {
+		return -1
+	}
+
+	return (r.Swap * 1_000_000) + r.BoundedMemoryLimit()
+}
+
+type Variables map[string]interface{}
+
+// Ugly hacky function to handle environment variables that get passed through as not-a-string
+// from the Panel. Ideally we'd just say only pass strings, but that is a fragile idea and if a
+// string wasn't passed through you'd cause a crash or the server to become unavailable. For now
+// try to handle the most likely values from the JSON and hope for the best.
+func (v Variables) Get(key string) string {
+	val, ok := v[key]
+	if !ok {
+		return ""
+	}
+
+	switch val.(type) {
+	case int:
+		return strconv.Itoa(val.(int))
+	case int32:
+		return strconv.FormatInt(val.(int64), 10)
+	case int64:
+		return strconv.FormatInt(val.(int64), 10)
+	case float32:
+		return fmt.Sprintf("%f", val.(float32))
+	case float64:
+		return fmt.Sprintf("%f", val.(float64))
+	case bool:
+		return strconv.FormatBool(val.(bool))
+	case string:
+		return val.(string)
+	}
+
+	// TODO: I think we can add a check for val == nil and return an empty string for those
+	//  and this warning should theoretically never happen?
+	log.Warn(fmt.Sprintf("failed to marshal environment variable \"%s\" of type %+v into string", key, val))
+
+	return ""
+}

environment/stats.go

@@ -0,0 +1,33 @@
+package environment
+
+// Defines the current resource usage for a given server instance. If a server is offline you
+// should obviously expect memory and CPU usage to be 0. However, disk will always be returned
+// since that is not dependent on the server being running to collect that data.
+type Stats struct {
+	// The total amount of memory, in bytes, that this server instance is consuming. This is
+	// calculated slightly differently than just using the raw Memory field that the stats
+	// return from the container, so please check the code setting this value for how that
+	// is calculated.
+	Memory uint64 `json:"memory_bytes"`
+
+	// The total amount of memory this container or resource can use. Inside Docker this is
+	// going to be higher than you'd expect because we're automatically allocating overhead
+	// abilities for the container, so its not going to be a perfect match.
+	MemoryLimit uint64 `json:"memory_limit_bytes"`
+
+	// The absolute CPU usage is the amount of CPU used in relation to the entire system and
+	// does not take into account any limits on the server process itself.
+	CpuAbsolute float64 `json:"cpu_absolute"`
+
+	// The current disk space being used by the server. This is cached to prevent slow lookup
+	// issues on frequent refreshes.
+	// Disk int64 `json:"disk_bytes"`
+
+	// Current network transmit in & out for a container.
+	Network NetworkStats `json:"network"`
+}
+
+type NetworkStats struct {
+	RxBytes uint64 `json:"rx_bytes"`
+	TxBytes uint64 `json:"tx_bytes"`
+}

events/events.go

@@ -0,0 +1,121 @@
+package events
+
+import (
+	"encoding/json"
+	"github.com/gammazero/workerpool"
+	"strings"
+	"sync"
+)
+
+type Event struct {
+	Data  string
+	Topic string
+}
+
+type EventBus struct {
+	mu    sync.RWMutex
+	pools map[string]*CallbackPool
+}
+
+func New() *EventBus {
+	return &EventBus{
+		pools: make(map[string]*CallbackPool),
+	}
+}
+
+// Publish data to a given topic.
+func (e *EventBus) Publish(topic string, data string) {
+	t := topic
+	// Some of our topics for the socket support passing a more specific namespace,
+	// such as "backup completed:1234" to indicate which specific backup was completed.
+	//
+	// In these cases, we still need to the send the event using the standard listener
+	// name of "backup completed".
+	if strings.Contains(topic, ":") {
+		parts := strings.SplitN(topic, ":", 2)
+
+		if len(parts) == 2 {
+			t = parts[0]
+		}
+	}
+
+	e.mu.RLock()
+	defer e.mu.RUnlock()
+
+	// Acquire a read lock and loop over all of the channels registered for the topic. This
+	// avoids a panic crash if the process tries to unregister the channel while this routine
+	// is running.
+	if cp, ok := e.pools[t]; ok {
+		for _, callback := range cp.callbacks {
+			c := *callback
+			evt := Event{Data: data, Topic: topic}
+			// Using the workerpool with one worker allows us to execute events in a FIFO manner. Running
+			// this using goroutines would cause things such as console output to just output in random order
+			// if more than one event is fired at the same time.
+			//
+			// However, the pool submission does not block the execution of this function itself, allowing
+			// us to call publish without blocking any of the other pathways.
+			//
+			// @see https://github.com/pterodactyl/panel/issues/2303
+			cp.pool.Submit(func() {
+				c(evt)
+			})
+		}
+	}
+}
+
+// Publishes a JSON message to a given topic.
+func (e *EventBus) PublishJson(topic string, data interface{}) error {
+	b, err := json.Marshal(data)
+	if err != nil {
+		return err
+	}
+
+	e.Publish(topic, string(b))
+
+	return nil
+}
+
+// Register a callback function that will be executed each time one of the events using the topic
+// name is called.
+func (e *EventBus) On(topic string, callback *func(Event)) {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	// Check if this topic has been registered at least once for the event listener, and if
+	// not create an empty struct for the topic.
+	if _, exists := e.pools[topic]; !exists {
+		e.pools[topic] = &CallbackPool{
+			callbacks: make([]*func(Event), 0),
+			pool:      workerpool.New(1),
+		}
+	}
+
+	// If this callback is not already registered as an event listener, go ahead and append
+	// it to the array of callbacks for this topic.
+	e.pools[topic].Add(callback)
+}
+
+// Removes an event listener from the bus.
+func (e *EventBus) Off(topic string, callback *func(Event)) {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	if cp, ok := e.pools[topic]; ok {
+		cp.Remove(callback)
+	}
+}
+
+// Removes all of the event listeners that have been registered for any topic. Also stops the worker
+// pool to close that routine.
+func (e *EventBus) Destroy() {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	// Stop every pool that exists for a given callback topic.
+	for _, cp := range e.pools {
+		cp.pool.Stop()
+	}
+
+	e.pools = make(map[string]*CallbackPool)
+}

events/pool.go

@@ -0,0 +1,49 @@
+package events
+
+import (
+	"github.com/gammazero/workerpool"
+	"reflect"
+)
+
+type CallbackPool struct {
+	callbacks []*func(Event)
+	pool      *workerpool.WorkerPool
+}
+
+// Pushes a new callback into the array of listeners for the pool.
+func (cp *CallbackPool) Add(callback *func(Event)) {
+	if cp.index(reflect.ValueOf(callback)) < 0 {
+		cp.callbacks = append(cp.callbacks, callback)
+	}
+}
+
+// Removes a callback from the array of registered callbacks if it exists.
+func (cp *CallbackPool) Remove(callback *func(Event)) {
+	i := cp.index(reflect.ValueOf(callback))
+
+	// If i < 0 it means there was no index found for the given callback, meaning it was
+	// never registered or was already unregistered from the listeners. Also double check
+	// that we didn't somehow escape the length of the topic callback (not sure how that
+	// would happen, but lets avoid a panic condition).
+	if i < 0 || i >= len(cp.callbacks) {
+		return
+	}
+
+	// We can assume that the topic still exists at this point since we acquire an exclusive
+	// lock on the process, and the "e.index" function cannot return a value >= 0 if there is
+	// no topic already existing.
+	cp.callbacks = append(cp.callbacks[:i], cp.callbacks[i+1:]...)
+}
+
+// Finds the index of a given callback in the topic by comparing all of the registered callback
+// pointers to the passed function. This function does not aquire a lock as it should only be called
+// within the confines of a function that has already acquired a lock for the duration of the lookup.
+func (cp *CallbackPool) index(v reflect.Value) int {
+	for i, handler := range cp.callbacks {
+		if reflect.ValueOf(handler).Pointer() == v.Pointer() {
+			return i
+		}
+	}
+
+	return -1
+}

go.mod

@@ -1,74 +1,81 @@
 module github.com/pterodactyl/wings
 
-go 1.12
-
-// Uncomment this in development environments to make changes to the core SFTP
-// server software. This assumes you're using the official Pterodactyl Environment
-// otherwise this path will not work.
-//
-// @see https://github.com/pterodactyl/development
-//
-// replace github.com/pterodactyl/sftp-server => ../sftp-server
+go 1.13
 
 require (
-	github.com/AlecAivazis/survey/v2 v2.0.7
-	github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 // indirect
-	github.com/Jeffail/gabs/v2 v2.2.0
-	github.com/Microsoft/go-winio v0.4.7 // indirect
-	github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5 // indirect
-	github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a
-	github.com/aws/aws-sdk-go v1.30.14 // indirect
+	emperror.dev/errors v0.8.0
+	github.com/AlecAivazis/survey/v2 v2.2.7
+	github.com/Jeffail/gabs/v2 v2.6.0
+	github.com/Microsoft/go-winio v0.4.16 // indirect
+	github.com/Microsoft/hcsshim v0.8.14 // indirect
+	github.com/NYTimes/logrotate v1.0.0
+	github.com/andybalholm/brotli v1.0.1 // indirect
+	github.com/apex/log v1.9.0
+	github.com/asaskevich/govalidator v0.0.0-20200907205600-7a23bdc65eef
 	github.com/beevik/etree v1.1.0
-	github.com/buger/jsonparser v0.0.0-20191204142016-1a29609e0929
+	github.com/buger/jsonparser v1.1.0
 	github.com/cobaugh/osrelease v0.0.0-20181218015638-a93a0a55a249
-	github.com/containerd/fifo v0.0.0-20190226154929-a9fb20d87448 // indirect
-	github.com/creasty/defaults v1.3.0
+	github.com/containerd/containerd v1.4.3 // indirect
+	github.com/containerd/fifo v0.0.0-20201026212402-0724c46b320c // indirect
+	github.com/creasty/defaults v1.5.1
 	github.com/docker/distribution v2.7.1+incompatible // indirect
-	github.com/docker/docker v0.0.0-20180422163414-57142e89befe
+	github.com/docker/docker v20.10.1+incompatible
 	github.com/docker/go-connections v0.4.0
-	github.com/docker/go-units v0.3.3 // indirect
-	github.com/gabriel-vasile/mimetype v0.1.4
-	github.com/gbrlsnchs/jwt/v3 v3.0.0-rc.0
-	github.com/ghodss/yaml v1.0.0
-	github.com/gin-gonic/gin v1.6.2
-	github.com/golang/protobuf v1.3.5 // indirect
-	github.com/google/uuid v1.1.1
-	github.com/gorilla/websocket v1.4.0
-	github.com/gotestyourself/gotestyourself v2.2.0+incompatible // indirect
-	github.com/iancoleman/strcase v0.0.0-20191112232945-16388991a334
-	github.com/imdario/mergo v0.3.8
-	github.com/klauspost/pgzip v1.2.3
-	github.com/magiconair/properties v1.8.1
-	github.com/mattn/go-shellwords v1.0.10 // indirect
-	github.com/mholt/archiver/v3 v3.3.0
+	github.com/docker/go-metrics v0.0.1 // indirect
+	github.com/fatih/color v1.10.0
+	github.com/franela/goblin v0.0.0-20200825194134-80c0062ed6cd
+	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/gabriel-vasile/mimetype v1.1.2
+	github.com/gammazero/deque v0.0.0-20201010052221-3932da5530cc // indirect
+	github.com/gammazero/workerpool v1.1.1
+	github.com/gbrlsnchs/jwt/v3 v3.0.0
+	github.com/gin-gonic/gin v1.6.3
+	github.com/go-playground/validator/v10 v10.4.1 // indirect
+	github.com/golang/snappy v0.0.2 // indirect
+	github.com/google/go-cmp v0.5.2 // indirect
+	github.com/google/uuid v1.1.2
+	github.com/gorilla/mux v1.7.4 // indirect
+	github.com/gorilla/websocket v1.4.2
+	github.com/iancoleman/strcase v0.1.2
+	github.com/icza/dyno v0.0.0-20200205103839-49cb13720835
+	github.com/imdario/mergo v0.3.9
+	github.com/juju/ratelimit v1.0.1
+	github.com/karrick/godirwalk v1.16.1
+	github.com/klauspost/compress v1.11.4 // indirect
+	github.com/klauspost/pgzip v1.2.5
+	github.com/leodido/go-urn v1.2.1 // indirect
+	github.com/magefile/mage v1.10.0 // indirect
+	github.com/magiconair/properties v1.8.4
+	github.com/mattn/go-colorable v0.1.8
+	github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d // indirect
+	github.com/mholt/archiver/v3 v3.5.0
 	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v1.0.1 // indirect
+	github.com/moby/term v0.0.0-20201216013528-df9cb8a40635 // indirect
+	github.com/morikuni/aec v1.0.0 // indirect
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
-	github.com/opencontainers/go-digest v1.0.0-rc1 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.0.1 // indirect
 	github.com/patrickmn/go-cache v2.1.0+incompatible
-	github.com/pkg/errors v0.9.1
-	github.com/pkg/profile v1.4.0
-	github.com/pkg/sftp v1.10.1 // indirect
-	github.com/pterodactyl/sftp-server v1.1.1
-	github.com/remeh/sizedwaitgroup v0.0.0-20180822144253-5e7302b12cce
-	github.com/sabhiram/go-gitignore v0.0.0-20180611051255-d3107576ba94
-	github.com/smartystreets/goconvey v1.6.4 // indirect
-	github.com/spf13/cobra v0.0.7
-	github.com/stretchr/objx v0.2.0 // indirect
-	github.com/yuin/goldmark v1.1.30 // indirect
-	go.uber.org/atomic v1.5.1 // indirect
-	go.uber.org/multierr v1.4.0 // indirect
-	go.uber.org/zap v1.13.0
-	golang.org/x/crypto v0.0.0-20200423211502-4bdfaf469ed5 // indirect
-	golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f // indirect
-	golang.org/x/net v0.0.0-20200425230154-ff2c4b7c35a0 // indirect
-	golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a
-	golang.org/x/sys v0.0.0-20200420163511-1957bb5e6d1f // indirect
-	golang.org/x/tools v0.0.0-20200426102838-f3a5411a4c3b // indirect
+	github.com/pierrec/lz4/v4 v4.1.2 // indirect
+	github.com/pkg/profile v1.5.0
+	github.com/pkg/sftp v1.12.0
+	github.com/prometheus/client_golang v1.9.0 // indirect
+	github.com/sabhiram/go-gitignore v0.0.0-20201211210132-54b8a0bf510f
+	github.com/sirupsen/logrus v1.7.0 // indirect
+	github.com/spf13/cobra v1.1.1
+	github.com/ugorji/go v1.2.2 // indirect
+	github.com/ulikunitz/xz v0.5.9 // indirect
+	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
+	golang.org/x/net v0.0.0-20201224014010-6772e930b67b // indirect
+	golang.org/x/sync v0.0.0-20201207232520-09787c993a3a
+	golang.org/x/sys v0.0.0-20201223074533-0d417f636930 // indirect
+	golang.org/x/term v0.0.0-20201210144234-2321bbc49cbf // indirect
+	golang.org/x/text v0.3.4 // indirect
+	golang.org/x/time v0.0.0-20201208040808-7e3f01d25324 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	google.golang.org/genproto v0.0.0-20201214200347-8c77b98c765d // indirect
+	google.golang.org/grpc v1.34.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
-	gopkg.in/ini.v1 v1.51.0
-	gopkg.in/yaml.v2 v2.2.8
-	gotest.tools v2.2.0+incompatible // indirect
+	gopkg.in/ini.v1 v1.62.0
+	gopkg.in/yaml.v2 v2.4.0
 )

installer/installer.go

@@ -1,16 +1,13 @@
 package installer
 
 import (
+	"emperror.dev/errors"
 	"encoding/json"
 	"github.com/asaskevich/govalidator"
 	"github.com/buger/jsonparser"
-	"github.com/pkg/errors"
 	"github.com/pterodactyl/wings/api"
-	"github.com/pterodactyl/wings/config"
+	"github.com/pterodactyl/wings/environment"
 	"github.com/pterodactyl/wings/server"
-	"go.uber.org/zap"
-	"os"
-	"path"
 )
 
 type Installer struct {
@@ -25,17 +22,12 @@ func New(data []byte) (*Installer, error) {
 		return nil, NewValidationError("uuid provided was not in a valid format")
 	}
 
-	if !govalidator.IsUUIDv4(getString(data, "service", "egg")) {
-		return nil, NewValidationError("service egg provided was not in a valid format")
-	}
-
-	s := &server.Server{
-		Uuid:       getString(data, "uuid"),
-		Suspended:  false,
-		State:      server.ProcessOfflineState,
-		Invocation: getString(data, "invocation"),
-		EnvVars:    make(map[string]string),
-		Build: server.BuildSettings{
+	cfg := &server.Configuration{
+		Uuid:           getString(data, "uuid"),
+		Suspended:      false,
+		Invocation:     getString(data, "invocation"),
+		SkipEggScripts: getBoolean(data, "skip_egg_scripts"),
+		Build: environment.Limits{
 			MemoryLimit: getInt(data, "build", "memory"),
 			Swap:        getInt(data, "build", "swap"),
 			IoWeight:    uint16(getInt(data, "build", "io")),
@@ -43,60 +35,55 @@ func New(data []byte) (*Installer, error) {
 			DiskSpace:   getInt(data, "build", "disk"),
 			Threads:     getString(data, "build", "threads"),
 		},
-		Allocations: server.Allocations{
-			Mappings: make(map[string][]int),
-		},
+		CrashDetectionEnabled: true,
 	}
 
-	s.Allocations.DefaultMapping.Ip = getString(data, "allocations", "default", "ip")
-	s.Allocations.DefaultMapping.Port = int(getInt(data, "allocations", "default", "port"))
+	cfg.Allocations.DefaultMapping.Ip = getString(data, "allocations", "default", "ip")
+	cfg.Allocations.DefaultMapping.Port = int(getInt(data, "allocations", "default", "port"))
 
 	// Unmarshal the environment variables from the request into the server struct.
 	if b, _, _, err := jsonparser.Get(data, "environment"); err != nil {
-		return nil, errors.WithStack(err)
+		return nil, err
 	} else {
-		s.EnvVars = make(map[string]string)
-		if err := json.Unmarshal(b, &s.EnvVars); err != nil {
-			return nil, errors.WithStack(err)
+		cfg.EnvVars = make(environment.Variables)
+		if err := json.Unmarshal(b, &cfg.EnvVars); err != nil {
+			return nil, err
 		}
 	}
 
 	// Unmarshal the allocation mappings from the request into the server struct.
 	if b, _, _, err := jsonparser.Get(data, "allocations", "mappings"); err != nil {
-		return nil, errors.WithStack(err)
+		return nil, err
 	} else {
-		s.Allocations.Mappings = make(map[string][]int)
-		if err := json.Unmarshal(b, &s.Allocations.Mappings); err != nil {
-			return nil, errors.WithStack(err)
+		cfg.Allocations.Mappings = make(map[string][]int)
+		if err := json.Unmarshal(b, &cfg.Allocations.Mappings); err != nil {
+			return nil, err
 		}
 	}
 
-	s.Container.Image = getString(data, "container", "image")
+	cfg.Container.Image = getString(data, "container", "image")
 
-	c, rerr, err := api.NewRequester().GetServerConfiguration(s.Uuid)
-	if err != nil || rerr != nil {
-		if err != nil {
-			return nil, errors.WithStack(err)
+	c, err := api.New().GetServerConfiguration(cfg.Uuid)
+	if err != nil {
+		if !api.IsRequestError(err) {
+			return nil, err
 		}
 
-		return nil, errors.New(rerr.String())
+		return nil, errors.New(err.Error())
 	}
 
-	// Destroy the temporary server instance.
-	s = nil
-
 	// Create a new server instance using the configuration we wrote to the disk
 	// so that everything gets instantiated correctly on the struct.
-	s2, err := server.FromConfiguration(c)
+	s, err := server.FromConfiguration(c)
 
 	return &Installer{
-		server: s2,
+		server: s,
 	}, err
 }
 
 // Returns the UUID associated with this installer instance.
 func (i *Installer) Uuid() string {
-	return i.server.Uuid
+	return i.server.Id()
 }
 
 // Return the server instance.
@@ -104,30 +91,6 @@ func (i *Installer) Server() *server.Server {
 	return i.server
 }
 
-// Executes the installer process, creating the server and running through the
-// associated installation process based on the parameters passed through for
-// the server instance.
-func (i *Installer) Execute() {
-	zap.S().Debugw("creating required server data directory", zap.String("server", i.Uuid()))
-	if err := os.MkdirAll(path.Join(config.Get().System.Data, i.Uuid()), 0755); err != nil {
-		zap.S().Errorw("failed to create server data directory", zap.String("server", i.Uuid()), zap.Error(errors.WithStack(err)))
-		return
-	}
-
-	if err := os.Chown(path.Join(config.Get().System.Data, i.Uuid()), config.Get().System.User.Uid, config.Get().System.User.Gid); err != nil {
-		zap.S().Errorw("failed to chown server data directory", zap.String("server", i.Uuid()), zap.Error(errors.WithStack(err)))
-		return
-	}
-
-	zap.S().Debugw("creating required environment for server instance", zap.String("server", i.Uuid()))
-	if err := i.server.Environment.Create(); err != nil {
-		zap.S().Errorw("failed to create environment for server", zap.String("server", i.Uuid()), zap.Error(err))
-		return
-	}
-
-	zap.S().Debugw("created environment for server during install process", zap.String("server", i.Uuid()))
-}
-
 // Returns a string value from the JSON data provided.
 func getString(data []byte, key ...string) string {
 	value, _ := jsonparser.GetString(data, key...)
@@ -141,3 +104,9 @@ func getInt(data []byte, key ...string) int64 {
 
 	return value
 }
+
+func getBoolean(data []byte, key ...string) bool {
+	value, _ := jsonparser.GetBoolean(data, key...)
+
+	return value
+}

loggers/cli/cli.go

@@ -0,0 +1,129 @@
+package cli
+
+import (
+	"emperror.dev/errors"
+	"fmt"
+	"github.com/apex/log"
+	"github.com/apex/log/handlers/cli"
+	color2 "github.com/fatih/color"
+	"github.com/mattn/go-colorable"
+	"io"
+	"os"
+	"strings"
+	"sync"
+	"time"
+)
+
+var Default = New(os.Stderr, true)
+var bold = color2.New(color2.Bold)
+var boldred = color2.New(color2.Bold, color2.FgRed)
+
+var Strings = [...]string{
+	log.DebugLevel: "DEBUG",
+	log.InfoLevel:  " INFO",
+	log.WarnLevel:  " WARN",
+	log.ErrorLevel: "ERROR",
+	log.FatalLevel: "FATAL",
+}
+
+type Handler struct {
+	mu      sync.Mutex
+	Writer  io.Writer
+	Padding int
+}
+
+func New(w io.Writer, useColors bool) *Handler {
+	if f, ok := w.(*os.File); ok {
+		if useColors {
+			return &Handler{Writer: colorable.NewColorable(f), Padding: 2}
+		}
+	}
+
+	return &Handler{Writer: colorable.NewNonColorable(w), Padding: 2}
+}
+
+// HandleLog implements log.Handler.
+func (h *Handler) HandleLog(e *log.Entry) error {
+	color := cli.Colors[e.Level]
+	level := Strings[e.Level]
+	names := e.Fields.Names()
+
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	color.Fprintf(h.Writer, "%s: [%s] %-25s", bold.Sprintf("%*s", h.Padding+1, level), time.Now().Format(time.StampMilli), e.Message)
+
+	for _, name := range names {
+		if name == "source" {
+			continue
+		}
+		fmt.Fprintf(h.Writer, " %s=%v", color.Sprint(name), e.Fields.Get(name))
+	}
+
+	fmt.Fprintln(h.Writer)
+
+	for _, name := range names {
+		if name != "error" {
+			continue
+		}
+
+		if err, ok := e.Fields.Get("error").(error); ok {
+			// Attach the stacktrace if it is missing at this point, but don't point
+			// it specifically to this line since that is irrelevant.
+			err = errors.WithStackDepthIf(err, 4)
+			formatted := fmt.Sprintf("\n%s\n%+v\n\n", boldred.Sprintf("Stacktrace:"), err)
+
+			if !strings.Contains(formatted, "runtime.goexit") {
+				_, _ = fmt.Fprint(h.Writer, formatted)
+				break
+			}
+
+			// Inserts a new-line between sections of a stack.
+			// When wrapping errors, you get multiple separate stacks that start with their message,
+			// this allows us to separate them with a new-line and view them more easily.
+			//
+			// For example:
+			//
+			// Stacktrace:
+			// readlink test: no such file or directory
+			// failed to read symlink target for 'test'
+			// github.com/pterodactyl/wings/server/filesystem.(*Archive).addToArchive
+			//         github.com/pterodactyl/wings/server/filesystem/archive.go:166
+			// ... (Truncated the stack for easier reading)
+			// runtime.goexit
+			//         runtime/asm_amd64.s:1374
+			// **NEW LINE INSERTED HERE**
+			// backup: error while generating server backup
+			// github.com/pterodactyl/wings/server.(*Server).Backup
+			//         github.com/pterodactyl/wings/server/backup.go:84
+			// ... (Truncated the stack for easier reading)
+			// runtime.goexit
+			//         runtime/asm_amd64.s:1374
+			//
+			var b strings.Builder
+			var endOfStack bool
+			for _, s := range strings.Split(formatted, "\n") {
+				b.WriteString(s + "\n")
+
+				if s == "runtime.goexit" {
+					endOfStack = true
+					continue
+				}
+
+				if !endOfStack {
+					continue
+				}
+
+				b.WriteString("\n")
+				endOfStack = false
+			}
+
+			_, _ = fmt.Fprint(h.Writer, b.String())
+		}
+
+		// Only one key with the name "error" can be in the map.
+		break
+	}
+
+	return nil
+}

parser/helpers.go

@@ -2,14 +2,13 @@ package parser
 
 import (
 	"bytes"
+	"emperror.dev/errors"
 	"github.com/Jeffail/gabs/v2"
+	"github.com/apex/log"
 	"github.com/buger/jsonparser"
 	"github.com/iancoleman/strcase"
-	"github.com/pkg/errors"
-	"go.uber.org/zap"
 	"io/ioutil"
 	"os"
-	"reflect"
 	"regexp"
 	"strconv"
 	"strings"
@@ -48,13 +47,14 @@ func readFileBytes(path string) ([]byte, error) {
 }
 
 // Gets the value of a key based on the value type defined.
-func getKeyValue(value []byte) interface{} {
-	if reflect.ValueOf(value).Kind() == reflect.Bool {
+func (cfr *ConfigurationFileReplacement) getKeyValue(value []byte) interface{} {
+	if cfr.ReplaceWith.Type() == jsonparser.Boolean {
 		v, _ := strconv.ParseBool(string(value))
 		return v
 	}
 
-	// Try to parse into an int, if this fails just ignore the error and
+	// Try to parse into an int, if this fails just ignore the error and continue
+	// through, returning the string.
 	if v, err := strconv.Atoi(string(value)); err == nil {
 		return v
 	}
@@ -70,7 +70,9 @@ func getKeyValue(value []byte) interface{} {
 // configurations per-world (such as Spigot and Bungeecord) where we'll need to make
 // adjustments to the bind address for the user.
 //
-// This does not currently support nested matches. container.*.foo.*.bar will not work.
+// This does not currently support nested wildcard matches. For example, foo.*.bar
+// will work, however foo.*.bar.*.baz will not, since we'll only be splitting at the
+// first wildcard, and not subsequent ones.
 func (f *ConfigurationFile) IterateOverJson(data []byte) (*gabs.Container, error) {
 	parsed, err := gabs.ParseJSON(data)
 	if err != nil {
@@ -94,13 +96,21 @@ func (f *ConfigurationFile) IterateOverJson(data []byte) (*gabs.Container, error
 			// If the child is a null value, nothing will happen. Seems reasonable as of the
 			// time this code is being written.
 			for _, child := range parsed.Path(strings.Trim(parts[0], ".")).Children() {
-				if err := v.SetAtPathway(child, strings.Trim(parts[1], "."), value); err != nil {
-					return nil, err
+				if err := v.SetAtPathway(child, strings.Trim(parts[1], "."), []byte(value)); err != nil {
+					if errors.Is(err, gabs.ErrNotFound) {
+						continue
+					}
+
+					return nil, errors.WithMessage(err, "failed to set config value of array child")
 				}
 			}
 		} else {
-			if err = v.SetAtPathway(parsed, v.Match, value); err != nil {
-				return nil, err
+			if err = v.SetAtPathway(parsed, v.Match, []byte(value)); err != nil {
+				if errors.Is(err, gabs.ErrNotFound) {
+					continue
+				}
+
+				return nil, errors.WithMessage(err, "unable to set config value at pathway: "+v.Match)
 			}
 		}
 	}
@@ -108,53 +118,122 @@ func (f *ConfigurationFile) IterateOverJson(data []byte) (*gabs.Container, error
 	return parsed, nil
 }
 
-// Sets the value at a specific pathway, but checks if we were looking for a specific
-// value or not before doing it.
-func (cfr *ConfigurationFileReplacement) SetAtPathway(c *gabs.Container, path string, value []byte) error {
-	if cfr.IfValue != "" {
-		// If this is a regex based matching, we need to get a little more creative since
-		// we're only going to replacing part of the string, and not the whole thing.
-		if c.Exists(path) && strings.HasPrefix(cfr.IfValue, "regex:") {
-			// We're doing some regex here.
-			r, err := regexp.Compile(strings.TrimPrefix(cfr.IfValue, "regex:"))
-			if err != nil {
-				zap.S().Warnw(
-					"configuration if_value using invalid regexp, cannot do replacement",
-					zap.String("if_value", strings.TrimPrefix(cfr.IfValue, "regex:")),
-					zap.Error(err),
-				)
-				return nil
-			}
+// Regex used to check if there is an array element present in the given pathway by looking for something
+// along the lines of "something[1]" or "something[1].nestedvalue" as the path.
+var checkForArrayElement = regexp.MustCompile(`^([^\[\]]+)\[([\d]+)](\..+)?$`)
 
-			// If the path exists and there is a regex match, go ahead and attempt the replacement
-			// using the value we got from the key. This will only replace the one match.
-			v := strings.Trim(string(c.Path(path).Bytes()), "\"")
-			if r.Match([]byte(v)) {
-				_, err := c.SetP(r.ReplaceAllString(v, string(value)), path)
+// Attempt to set the value of the path depending on if it is an array or not. Gabs cannot handle array
+// values as "something[1]" but can parse them just fine. This is basically just overly complex code
+// to handle that edge case and ensure the value gets set correctly.
+//
+// Bless thee who has to touch these most unholy waters.
+func setValueAtPath(c *gabs.Container, path string, value interface{}) error {
+	var err error
 
-				return err
-			}
+	matches := checkForArrayElement.FindStringSubmatch(path)
+	if len(matches) < 3 {
+		// Only update the value if the pathway actually exists in the configuration, otherwise
+		// do nothing.
+		if c.ExistsP(path) {
+			_, err = c.SetP(value, path)
+		}
 
-			return nil
-		} else {
-			if !c.Exists(path) || (c.Exists(path) && !bytes.Equal(c.Bytes(), []byte(cfr.IfValue))) {
-				return nil
-			}
+		return err
+	}
+
+	i, _ := strconv.Atoi(matches[2])
+	// Find the array element "i" or try to create it if "i" is equal to 0 and is not found
+	// at the given path.
+	ct, err := c.ArrayElementP(i, matches[1])
+	if err != nil {
+		if i != 0 || (!errors.Is(err, gabs.ErrNotArray) && !errors.Is(err, gabs.ErrNotFound)) {
+			return errors.WithMessage(err, "error while parsing array element at path")
+		}
+
+		t := make([]interface{}, 1)
+		// If the length of matches is 4 it means we're trying to access an object down in this array
+		// key, so make sure we generate the array as an array of objects, and not just a generic nil
+		// array.
+		if len(matches) == 4 {
+			t = []interface{}{map[string]interface{}{}}
+		}
+
+		// If the error is because this isn't an array or isn't found go ahead and create the array with
+		// an empty object if we have additional things to set on the array, or just an empty array type
+		// if there is not an object structure detected (no matches[3] available).
+		if _, err = c.SetP(t, matches[1]); err != nil {
+			return errors.WithMessage(err, "failed to create empty array for missing element")
+		}
+
+		// Set our cursor to be the array element we expect, which in this case is just the first element
+		// since we won't run this code unless the array element is 0. There is too much complexity in trying
+		// to match additional elements. In those cases the server will just have to be rebooted or something.
+		ct, err = c.ArrayElementP(0, matches[1])
+		if err != nil {
+			return errors.WithMessage(err, "failed to find array element at path")
 		}
 	}
 
-	_, err := c.SetP(getKeyValue(value), path)
+	// Try to set the value. If the path does not exist an error will be raised to the caller which will
+	// then check if the error is because the path is missing. In those cases we just ignore the error since
+	// we don't want to do anything specifically when that happens.
+	//
+	// If there are four matches in the regex it means that we managed to also match a trailing pathway
+	// for the key, which should be found in the given array key item and modified further.
+	if len(matches) == 4 {
+		_, err = ct.SetP(value, strings.TrimPrefix(matches[3], "."))
+	} else {
+		_, err = ct.Set(value)
+	}
 
-	return err
+	if err != nil {
+		return errors.WithMessage(err, "failed to set value at config path: "+path)
+	}
+
+	return nil
+}
+
+// Sets the value at a specific pathway, but checks if we were looking for a specific
+// value or not before doing it.
+func (cfr *ConfigurationFileReplacement) SetAtPathway(c *gabs.Container, path string, value []byte) error {
+	if cfr.IfValue == "" {
+		return setValueAtPath(c, path, cfr.getKeyValue(value))
+	}
+
+	// If this is a regex based matching, we need to get a little more creative since
+	// we're only going to replacing part of the string, and not the whole thing.
+	if c.ExistsP(path) && strings.HasPrefix(cfr.IfValue, "regex:") {
+		// We're doing some regex here.
+		r, err := regexp.Compile(strings.TrimPrefix(cfr.IfValue, "regex:"))
+		if err != nil {
+			log.WithFields(log.Fields{"if_value": strings.TrimPrefix(cfr.IfValue, "regex:"), "error": err}).
+				Warn("configuration if_value using invalid regexp, cannot perform replacement")
+
+			return nil
+		}
+
+		// If the path exists and there is a regex match, go ahead and attempt the replacement
+		// using the value we got from the key. This will only replace the one match.
+		v := strings.Trim(string(c.Path(path).Bytes()), "\"")
+		if r.Match([]byte(v)) {
+			return setValueAtPath(c, path, r.ReplaceAllString(v, string(value)))
+		}
+
+		return nil
+	} else if !c.ExistsP(path) || (c.ExistsP(path) && !bytes.Equal(c.Bytes(), []byte(cfr.IfValue))) {
+		return nil
+	}
+
+	return setValueAtPath(c, path, cfr.getKeyValue(value))
 }
 
 // Looks up a configuration value on the Daemon given a dot-notated syntax.
-func (f *ConfigurationFile) LookupConfigurationValue(cfr ConfigurationFileReplacement) ([]byte, error) {
+func (f *ConfigurationFile) LookupConfigurationValue(cfr ConfigurationFileReplacement) (string, error) {
 	// If this is not something that we can do a regex lookup on then just continue
 	// on our merry way. If the value isn't a string, we're not going to be doing anything
 	// with it anyways.
 	if cfr.ReplaceWith.Type() != jsonparser.String || !configMatchRegex.Match(cfr.ReplaceWith.Value()) {
-		return cfr.ReplaceWith.Value(), nil
+		return cfr.ReplaceWith.String(), nil
 	}
 
 	// If there is a match, lookup the value in the configuration for the Daemon. If no key
@@ -165,11 +244,8 @@ func (f *ConfigurationFile) LookupConfigurationValue(cfr ConfigurationFileReplac
 	)
 
 	var path []string
-	// The camel casing is important here, the configuration for the Daemon does not use
-	// JSON, and as such all of the keys will be generated in CamelCase format, rather than
-	// the expected snake_case from the old Daemon.
 	for _, value := range strings.Split(huntPath, ".") {
-		path = append(path, strcase.ToCamel(value))
+		path = append(path, strcase.ToSnake(value))
 	}
 
 	// Look for the key in the configuration file, and if found return that value to the
@@ -177,21 +253,15 @@ func (f *ConfigurationFile) LookupConfigurationValue(cfr ConfigurationFileReplac
 	match, _, _, err := jsonparser.Get(f.configuration, path...)
 	if err != nil {
 		if err != jsonparser.KeyPathNotFoundError {
-			return match, errors.WithStack(err)
+			return string(match), err
 		}
 
-		zap.S().Debugw(
-			"attempted to load a configuration value that does not exist",
-			zap.Strings("path", path),
-			zap.String("filename", f.FileName),
-		)
+		log.WithFields(log.Fields{"path": path, "filename": f.FileName}).Debug("attempted to load a configuration value that does not exist")
 
 		// If there is no key, keep the original value intact, that way it is obvious there
 		// is a replace issue at play.
-		return match, nil
+		return string(match), nil
 	} else {
-		replaced := []byte(configMatchRegex.ReplaceAllString(cfr.ReplaceWith.String(), string(match)))
-
-		return replaced, nil
+		return configMatchRegex.ReplaceAllString(cfr.ReplaceWith.String(), string(match)), nil
 	}
 }

parser/parser.go

@@ -2,17 +2,20 @@ package parser
 
 import (
 	"bufio"
+	"emperror.dev/errors"
 	"encoding/json"
+	"github.com/apex/log"
 	"github.com/beevik/etree"
 	"github.com/buger/jsonparser"
-	"github.com/ghodss/yaml"
+	"github.com/icza/dyno"
 	"github.com/magiconair/properties"
-	"github.com/pkg/errors"
 	"github.com/pterodactyl/wings/config"
-	"go.uber.org/zap"
 	"gopkg.in/ini.v1"
+	"gopkg.in/yaml.v2"
 	"io/ioutil"
 	"os"
+	"path/filepath"
+	"strconv"
 	"strings"
 )
 
@@ -28,6 +31,10 @@ const (
 
 type ConfigurationParser string
 
+func (cp ConfigurationParser) String() string {
+	return string(cp)
+}
+
 // Defines a configuration file for the server startup. These will be looped over
 // and modified before the server finishes booting.
 type ConfigurationFile struct {
@@ -40,6 +47,35 @@ type ConfigurationFile struct {
 	configuration []byte
 }
 
+// Custom unmarshaler for configuration files. If there is an error while parsing out the
+// replacements, don't fail the entire operation, just log a global warning so someone can
+// find the issue, and return an empty array of replacements.
+//
+// I imagine people will notice configuration replacement isn't working correctly and then
+// the logs should help better expose that issue.
+func (f *ConfigurationFile) UnmarshalJSON(data []byte) error {
+	var m map[string]*json.RawMessage
+	if err := json.Unmarshal(data, &m); err != nil {
+		return err
+	}
+
+	if err := json.Unmarshal(*m["file"], &f.FileName); err != nil {
+		return err
+	}
+
+	if err := json.Unmarshal(*m["parser"], &f.Parser); err != nil {
+		return err
+	}
+
+	if err := json.Unmarshal(*m["replace"], &f.Replace); err != nil {
+		log.WithField("file", f.FileName).WithField("error", err).Warn("failed to unmarshal configuration file replacement")
+
+		f.Replace = []ConfigurationFileReplacement{}
+	}
+
+	return nil
+}
+
 // Defines a single find/replace instance for a given server configuration file.
 type ConfigurationFileReplacement struct {
 	Match       string       `json:"match"`
@@ -52,22 +88,33 @@ type ConfigurationFileReplacement struct {
 func (cfr *ConfigurationFileReplacement) UnmarshalJSON(data []byte) error {
 	m, err := jsonparser.GetString(data, "match")
 	if err != nil {
-		return errors.WithStack(err)
+		return err
 	}
+
 	cfr.Match = m
 
 	iv, err := jsonparser.GetString(data, "if_value")
 	// We only check keypath here since match & replace_with should be present on all of
 	// them, however if_value is optional.
 	if err != nil && err != jsonparser.KeyPathNotFoundError {
-		return errors.WithStack(err)
+		return err
 	}
 	cfr.IfValue = iv
 
 	rw, dt, _, err := jsonparser.Get(data, "replace_with")
 	if err != nil {
-		return errors.WithStack(err)
+		if err != jsonparser.KeyPathNotFoundError {
+			return err
+		}
+
+		// Okay, likely dealing with someone who forgot to upgrade their eggs, so in
+		// that case, fallback to using the old key which was "value".
+		rw, dt, _, err = jsonparser.Get(data, "value")
+		if err != nil {
+			return err
+		}
 	}
+
 	cfr.ReplaceWith = ReplaceValue{
 		value:     rw,
 		valueType: dt,
@@ -79,10 +126,13 @@ func (cfr *ConfigurationFileReplacement) UnmarshalJSON(data []byte) error {
 // Parses a given configuration file and updates all of the values within as defined
 // in the API response from the Panel.
 func (f *ConfigurationFile) Parse(path string, internal bool) error {
-	zap.S().Debugw("parsing configuration file", zap.String("path", path), zap.String("parser", string(f.Parser)))
+	log.WithField("path", path).WithField("parser", f.Parser.String()).Debug("parsing server configuration file")
 
-	mb, _ := json.Marshal(config.Get())
-	f.configuration = mb
+	if mb, err := json.Marshal(config.Get()); err != nil {
+		return err
+	} else {
+		f.configuration = mb
+	}
 
 	var err error
 
@@ -107,21 +157,26 @@ func (f *ConfigurationFile) Parse(path string, internal bool) error {
 		break
 	}
 
-	if os.IsNotExist(err) {
+	if errors.Is(err, os.ErrNotExist) {
 		// File doesn't exist, we tried creating it, and same error is returned? Pretty
 		// sure this pathway is impossible, but if not, abort here.
 		if internal {
 			return nil
 		}
 
-		if _, err := os.Create(path); err != nil {
-			return errors.WithStack(err)
+		b := strings.TrimSuffix(path, filepath.Base(path))
+		if err := os.MkdirAll(b, 0755); err != nil {
+			return errors.WithMessage(err, "failed to create base directory for missing configuration file")
+		} else {
+			if _, err := os.Create(path); err != nil {
+				return errors.WithMessage(err, "failed to create missing configuration file")
+			}
 		}
 
 		return f.Parse(path, true)
 	}
 
-	return errors.WithStack(err)
+	return err
 }
 
 // Parses an xml file.
@@ -164,7 +219,7 @@ func (f *ConfigurationFile) parseXmlFile(path string) error {
 			parts := strings.Split(replacement.Match, ".")
 
 			// Set the initial element to be the root element, and then work from there.
-			var element = doc.Root()
+			element := doc.Root()
 
 			// Iterate over the path to create the required structure for the given element's path.
 			// This does not set a value, only ensures that the base structure exists. We start at index
@@ -181,13 +236,13 @@ func (f *ConfigurationFile) parseXmlFile(path string) error {
 
 		// Iterate over the elements we found and update their values.
 		for _, element := range doc.FindElements(path) {
-			if xmlValueMatchRegex.Match(value) {
-				k := xmlValueMatchRegex.ReplaceAllString(string(value), "$1")
-				v := xmlValueMatchRegex.ReplaceAllString(string(value), "$2")
+			if xmlValueMatchRegex.MatchString(value) {
+				k := xmlValueMatchRegex.ReplaceAllString(value, "$1")
+				v := xmlValueMatchRegex.ReplaceAllString(value, "$2")
 
 				element.CreateAttr(k, v)
 			} else {
-				element.SetText(string(value))
+				element.SetText(value)
 			}
 		}
 	}
@@ -218,12 +273,13 @@ func (f *ConfigurationFile) parseXmlFile(path string) error {
 // Parses an ini file.
 func (f *ConfigurationFile) parseIniFile(path string) error {
 	// Ini package can't handle a non-existent file, so handle that automatically here
-	// by creating it if not exists.
+	// by creating it if not exists. Then, immediately close the file since we will use
+	// other methods to write the new contents.
 	file, err := os.OpenFile(path, os.O_CREATE|os.O_RDWR, 0644)
 	if err != nil {
 		return err
 	}
-	defer file.Close()
+	file.Close()
 
 	cfg, err := ini.Load(path)
 	if err != nil {
@@ -258,24 +314,15 @@ func (f *ConfigurationFile) parseIniFile(path string) error {
 		// If the key exists in the file go ahead and set the value, otherwise try to
 		// create it in the section.
 		if s.HasKey(k) {
-			s.Key(k).SetValue(string(value))
+			s.Key(k).SetValue(value)
 		} else {
-			if _, err := s.NewKey(k, string(value)); err != nil {
+			if _, err := s.NewKey(k, value); err != nil {
 				return err
 			}
 		}
 	}
 
-	// Truncate the file before attempting to write the changes.
-	if err := os.Truncate(path, 0); err != nil {
-		return err
-	}
-
-	if _, err := cfg.WriteTo(file); err != nil {
-		return err
-	}
-
-	return nil
+	return cfg.SaveTo(path)
 }
 
 // Parses a json file updating any matching key/value pairs. If a match is not found, the
@@ -304,10 +351,15 @@ func (f *ConfigurationFile) parseYamlFile(path string) error {
 		return err
 	}
 
+	i := make(map[string]interface{})
+	if err := yaml.Unmarshal(b, &i); err != nil {
+		return err
+	}
+
 	// Unmarshal the yaml data into a JSON interface such that we can work with
 	// any arbitrary data structure. If we don't do this, I can't use gabs which
-	// makes working with unknown JSON signficiantly easier.
-	jsonBytes, err := yaml.YAMLToJSON(b)
+	// makes working with unknown JSON significantly easier.
+	jsonBytes, err := json.Marshal(dyno.ConvertMapI2MapS(i))
 	if err != nil {
 		return err
 	}
@@ -320,7 +372,7 @@ func (f *ConfigurationFile) parseYamlFile(path string) error {
 	}
 
 	// Remarshal the JSON into YAML format before saving it back to the disk.
-	marshaled, err := yaml.JSONToYAML(data.Bytes())
+	marshaled, err := yaml.Marshal(data.Data())
 	if err != nil {
 		return err
 	}
@@ -332,38 +384,25 @@ func (f *ConfigurationFile) parseYamlFile(path string) error {
 // scanning a file and performing a replacement. You should attempt to use anything other
 // than this function where possible.
 func (f *ConfigurationFile) parseTextFile(path string) error {
-	file, err := os.OpenFile(path, os.O_CREATE|os.O_RDWR, 0644)
+	input, err := ioutil.ReadFile(path)
 	if err != nil {
 		return err
 	}
-	defer file.Close()
 
-	scanner := bufio.NewScanner(file)
-	for scanner.Scan() {
-		hasReplaced := false
-		t := scanner.Text()
-
-		// Iterate over the potential replacements for the line and check if there are
-		// any matches.
+	lines := strings.Split(string(input), "\n")
+	for i, line := range lines {
 		for _, replace := range f.Replace {
-			if !strings.HasPrefix(t, replace.Match) {
+			// If this line doesn't match what we expect for the replacement, move on to the next
+			// line. Otherwise, update the line to have the replacement value.
+			if !strings.HasPrefix(line, replace.Match) {
 				continue
 			}
 
-			hasReplaced = true
-			t = strings.Replace(t, replace.Match, replace.ReplaceWith.String(), 1)
-		}
-
-		// If there was a replacement that occurred on this specific line, do a write to the file
-		// immediately to write that modified content to the disk.
-		if hasReplaced {
-			if _, err := file.WriteAt([]byte(t), int64(len(scanner.Bytes()))); err != nil {
-				return err
-			}
+			lines[i] = replace.ReplaceWith.String()
 		}
 	}
 
-	if err := scanner.Err(); err != nil {
+	if err := ioutil.WriteFile(path, []byte(strings.Join(lines, "\n")), 0644); err != nil {
 		return err
 	}
 
@@ -373,11 +412,41 @@ func (f *ConfigurationFile) parseTextFile(path string) error {
 // Parses a properties file and updates the values within it to match those that
 // are passed. Writes the file once completed.
 func (f *ConfigurationFile) parsePropertiesFile(path string) error {
+	// Open the file.
+	f2, err := os.Open(path)
+	if err != nil {
+		return err
+	}
+
+	var s strings.Builder
+
+	// Get any header comments from the file.
+	scanner := bufio.NewScanner(f2)
+	for scanner.Scan() {
+		text := scanner.Text()
+		if len(text) > 0 && text[0] != '#' {
+			break
+		}
+
+		s.WriteString(text)
+		s.WriteString("\n")
+	}
+
+	// Close the file.
+	_ = f2.Close()
+
+	// Handle any scanner errors.
+	if err := scanner.Err(); err != nil {
+		return err
+	}
+
+	// Decode the properties file.
 	p, err := properties.LoadFile(path, properties.UTF8)
 	if err != nil {
 		return err
 	}
 
+	// Replace any values that need to be replaced.
 	for _, replace := range f.Replace {
 		data, err := f.LookupConfigurationValue(replace)
 		if err != nil {
@@ -392,17 +461,35 @@ func (f *ConfigurationFile) parsePropertiesFile(path string) error {
 			continue
 		}
 
-		if _, _, err := p.Set(replace.Match, string(data)); err != nil {
+		if _, _, err := p.Set(replace.Match, data); err != nil {
 			return err
 		}
 	}
 
+	// Add the new file content to the string builder.
+	for _, key := range p.Keys() {
+		value, ok := p.Get(key)
+		if !ok {
+			continue
+		}
+
+		s.WriteString(key)
+		s.WriteByte('=')
+		s.WriteString(strings.Trim(strconv.QuoteToASCII(value), `"`))
+		s.WriteString("\n")
+	}
+
+	// Open the file for writing.
 	w, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
 	if err != nil {
 		return err
 	}
+	defer w.Close()
 
-	_, err = p.Write(w, properties.UTF8)
+	// Write the data to the file.
+	if _, err := w.Write([]byte(s.String())); err != nil {
+		return err
+	}
 
-	return err
+	return nil
 }

parser/value.go

@@ -14,9 +14,11 @@ func (cv *ReplaceValue) Value() []byte {
 }
 
 func (cv *ReplaceValue) String() string {
-	return string(cv.value)
+	str, _ := jsonparser.ParseString(cv.value)
+
+	return str
 }
 
 func (cv *ReplaceValue) Type() jsonparser.ValueType {
 	return cv.valueType
-}
+}

router/downloader/downloader.go

@@ -0,0 +1,304 @@
+package downloader
+
+import (
+	"context"
+	"emperror.dev/errors"
+	"encoding/json"
+	"fmt"
+	"github.com/google/uuid"
+	"github.com/pterodactyl/wings/server"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"sync"
+	"time"
+)
+
+var client = &http.Client{Timeout: time.Hour * 12}
+var instance = &Downloader{
+	// Tracks all of the active downloads.
+	downloadCache: make(map[string]*Download),
+	// Tracks all of the downloads active for a given server instance. This is
+	// primarily used to make things quicker and keep the code a little more
+	// legible throughout here.
+	serverCache: make(map[string][]string),
+}
+
+// Regex to match the end of an IPv4/IPv6 address. This allows the port to be removed
+// so that we are just working with the raw IP address in question.
+var ipMatchRegex = regexp.MustCompile(`(:\d+)$`)
+
+// Internal IP ranges that should be blocked if the resource requested resolves within.
+var internalRanges = []*net.IPNet{
+	mustParseCIDR("127.0.0.1/8"),
+	mustParseCIDR("10.0.0.0/8"),
+	mustParseCIDR("172.16.0.0/12"),
+	mustParseCIDR("192.168.0.0/16"),
+	mustParseCIDR("169.254.0.0/16"),
+	mustParseCIDR("::1/128"),
+	mustParseCIDR("fe80::/10"),
+	mustParseCIDR("fc00::/7"),
+}
+
+const ErrInternalResolution = errors.Sentinel("downloader: destination resolves to internal network location")
+const ErrInvalidIPAddress = errors.Sentinel("downloader: invalid IP address")
+const ErrDownloadFailed = errors.Sentinel("downloader: download request failed")
+
+type Counter struct {
+	total   int
+	onWrite func(total int)
+}
+
+func (c *Counter) Write(p []byte) (int, error) {
+	n := len(p)
+	c.total += n
+	c.onWrite(c.total)
+	return n, nil
+}
+
+type DownloadRequest struct {
+	URL       *url.URL
+	Directory string
+}
+
+type Download struct {
+	Identifier string
+	mu         sync.RWMutex
+	req        DownloadRequest
+	server     *server.Server
+	progress   float64
+	cancelFunc *context.CancelFunc
+}
+
+// Starts a new tracked download which allows for cancelation later on by calling
+// the Downloader.Cancel function.
+func New(s *server.Server, r DownloadRequest) *Download {
+	dl := Download{
+		Identifier: uuid.Must(uuid.NewRandom()).String(),
+		req:        r,
+		server:     s,
+	}
+	instance.track(&dl)
+	return &dl
+}
+
+// Returns all of the tracked downloads for a given server instance.
+func ByServer(sid string) []*Download {
+	instance.mu.Lock()
+	defer instance.mu.Unlock()
+	var downloads []*Download
+	if v, ok := instance.serverCache[sid]; ok {
+		for _, id := range v {
+			if dl, dlok := instance.downloadCache[id]; dlok {
+				downloads = append(downloads, dl)
+			}
+		}
+	}
+	return downloads
+}
+
+// Returns a single Download matching a given identifier. If no download is found
+// the second argument in the response will be false.
+func ByID(dlid string) *Download {
+	return instance.find(dlid)
+}
+
+//goland:noinspection GoVetCopyLock
+func (dl Download) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Identifier string
+		Progress   float64
+	}{
+		Identifier: dl.Identifier,
+		Progress:   dl.Progress(),
+	})
+}
+
+// Executes a given download for the server and begins writing the file to the disk. Once
+// completed the download will be removed from the cache.
+func (dl *Download) Execute() error {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Hour*12)
+	dl.cancelFunc = &cancel
+	defer dl.Cancel()
+
+	// Always ensure that we're checking the destination for the download to avoid a malicious
+	// user from accessing internal network resources.
+	if err := dl.isExternalNetwork(ctx); err != nil {
+		return err
+	}
+
+	// At this point we have verified the destination is not within the local network, so we can
+	// now make a request to that URL and pull down the file, saving it to the server's data
+	// directory.
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, dl.req.URL.String(), nil)
+	if err != nil {
+		return errors.WrapIf(err, "downloader: failed to create request")
+	}
+
+	req.Header.Set("User-Agent", "Pterodactyl Panel (https://pterodactyl.io)")
+	res, err := client.Do(req)
+	if err != nil {
+		return ErrDownloadFailed
+	}
+	defer res.Body.Close()
+	if res.StatusCode != http.StatusOK {
+		return errors.New("downloader: got bad response status from endpoint: " + res.Status)
+	}
+
+	// If there is a Content-Length header on this request go ahead and check that we can
+	// even write the whole file before beginning this process. If there is no header present
+	// we'll just have to give it a spin and see how it goes.
+	if res.ContentLength > 0 {
+		if err := dl.server.Filesystem().HasSpaceFor(res.ContentLength); err != nil {
+			return errors.WrapIf(err, "downloader: failed to write file: not enough space")
+		}
+	}
+
+	fnameparts := strings.Split(dl.req.URL.Path, "/")
+	p := filepath.Join(dl.req.Directory, fnameparts[len(fnameparts)-1])
+	dl.server.Log().WithField("path", p).Debug("writing remote file to disk")
+
+	r := io.TeeReader(res.Body, dl.counter(res.ContentLength))
+	if err := dl.server.Filesystem().Writefile(p, r); err != nil {
+		return errors.WrapIf(err, "downloader: failed to write file to server directory")
+	}
+	return nil
+}
+
+// Cancels a running download and frees up the associated resources. If a file is being
+// written a partial file will remain present on the disk.
+func (dl *Download) Cancel() {
+	if dl.cancelFunc != nil {
+		(*dl.cancelFunc)()
+	}
+	instance.remove(dl.Identifier)
+}
+
+// Checks if the given download belongs to the provided server.
+func (dl *Download) BelongsTo(s *server.Server) bool {
+	return dl.server.Id() == s.Id()
+}
+
+// Returns the current progress of the download as a float value between 0 and 1 where
+// 1 indicates that the download is completed.
+func (dl *Download) Progress() float64 {
+	dl.mu.RLock()
+	defer dl.mu.RUnlock()
+	return dl.progress
+}
+
+// Handles a write event by updating the progress completed percentage and firing off
+// events to the server websocket as needed.
+func (dl *Download) counter(contentLength int64) *Counter {
+	onWrite := func(t int) {
+		dl.mu.Lock()
+		defer dl.mu.Unlock()
+		dl.progress = float64(t) / float64(contentLength)
+	}
+	return &Counter{
+		onWrite: onWrite,
+	}
+}
+
+// Verifies that a given download resolves to a location not within the current local
+// network for the machine. If the final destination of a resource is within the local
+// network an ErrInternalResolution error is returned.
+func (dl *Download) isExternalNetwork(ctx context.Context) error {
+	dialer := &net.Dialer{
+		LocalAddr: nil,
+	}
+
+	host := dl.req.URL.Host
+	if !ipMatchRegex.MatchString(host) {
+		if dl.req.URL.Scheme == "https" {
+			host = host + ":443"
+		} else {
+			host = host + ":80"
+		}
+	}
+
+	c, err := dialer.DialContext(ctx, "tcp", host)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	c.Close()
+
+	ip := net.ParseIP(ipMatchRegex.ReplaceAllString(c.RemoteAddr().String(), ""))
+	if ip == nil {
+		return errors.WithStack(ErrInvalidIPAddress)
+	}
+	if ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() || ip.IsInterfaceLocalMulticast() {
+		return errors.WithStack(ErrInternalResolution)
+	}
+	for _, block := range internalRanges {
+		if block.Contains(ip) {
+			return errors.WithStack(ErrInternalResolution)
+		}
+	}
+	return nil
+}
+
+// Defines a global downloader struct that keeps track of all currently processing downloads
+// for the machine.
+type Downloader struct {
+	mu            sync.RWMutex
+	downloadCache map[string]*Download
+	serverCache   map[string][]string
+}
+
+// Tracks a download in the internal cache for this instance.
+func (d *Downloader) track(dl *Download) {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+	sid := dl.server.Id()
+	if _, ok := d.downloadCache[dl.Identifier]; !ok {
+		d.downloadCache[dl.Identifier] = dl
+		if _, ok := d.serverCache[sid]; !ok {
+			d.serverCache[sid] = []string{}
+		}
+		d.serverCache[sid] = append(d.serverCache[sid], dl.Identifier)
+	}
+}
+
+// Finds a given download entry using the provided ID and returns it.
+func (d *Downloader) find(dlid string) *Download {
+	d.mu.RLock()
+	defer d.mu.RUnlock()
+	if entry, ok := d.downloadCache[dlid]; ok {
+		return entry
+	}
+	return nil
+}
+
+// Remove the given download reference from the cache storing them. This also updates
+// the slice of active downloads for a given server to not include this download.
+func (d *Downloader) remove(dlid string) {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+	if _, ok := d.downloadCache[dlid]; !ok {
+		return
+	}
+	sid := d.downloadCache[dlid].server.Id()
+	delete(d.downloadCache, dlid)
+	if tracked, ok := d.serverCache[sid]; ok {
+		var out []string
+		for _, k := range tracked {
+			if k != dlid {
+				out = append(out, k)
+			}
+		}
+		d.serverCache[sid] = out
+	}
+}
+
+func mustParseCIDR(ip string) *net.IPNet {
+	_, block, err := net.ParseCIDR(ip)
+	if err != nil {
+		panic(fmt.Errorf("downloader: failed to parse CIDR: %s", err))
+	}
+	return block
+}

router/error.go

@@ -1,48 +1,64 @@
 package router
 
 import (
+	"emperror.dev/errors"
 	"fmt"
+	"github.com/apex/log"
 	"github.com/gin-gonic/gin"
 	"github.com/google/uuid"
-	"github.com/pkg/errors"
 	"github.com/pterodactyl/wings/server"
-	"go.uber.org/zap"
+	"github.com/pterodactyl/wings/server/filesystem"
 	"net/http"
 	"os"
+	"strings"
 )
 
 type RequestError struct {
-	Err     error
-	Uuid    string
-	Message string
+	err     error
+	uuid    string
+	message string
 	server  *server.Server
 }
 
+// Attaches an error to the gin.Context object for the request and ensures that it
+// has a proper stacktrace associated with it when doing so.
+//
+// If you just call c.Error(err) without using this function you'll likely end up
+// with an error that has no annotated stack on it.
+func WithError(c *gin.Context, err error) error {
+	return c.Error(errors.WithStackDepthIf(err, 1))
+}
+
 // Generates a new tracked error, which simply tracks the specific error that
 // is being passed in, and also assigned a UUID to the error so that it can be
 // cross referenced in the logs.
-func TrackedError(err error) *RequestError {
+func NewTrackedError(err error) *RequestError {
 	return &RequestError{
-		Err:     err,
-		Uuid:    uuid.Must(uuid.NewRandom()).String(),
-		Message: "",
+		err:  err,
+		uuid: uuid.Must(uuid.NewRandom()).String(),
 	}
 }
 
-// Same as TrackedError, except this will also attach the server instance that
+// Same as NewTrackedError, except this will also attach the server instance that
 // generated this server for the purposes of logging.
-func TrackedServerError(err error, s *server.Server) *RequestError {
+func NewServerError(err error, s *server.Server) *RequestError {
 	return &RequestError{
-		Err:     err,
-		Uuid:    uuid.Must(uuid.NewRandom()).String(),
-		Message: "",
-		server:  s,
+		err:    err,
+		uuid:   uuid.Must(uuid.NewRandom()).String(),
+		server: s,
 	}
 }
 
+func (e *RequestError) logger() *log.Entry {
+	if e.server != nil {
+		return e.server.Log().WithField("error_id", e.uuid).WithField("error", e.err)
+	}
+	return log.WithField("error_id", e.uuid).WithField("error", e.err)
+}
+
 // Sets the output message to display to the user in the error.
 func (e *RequestError) SetMessage(msg string) *RequestError {
-	e.Message = msg
+	e.message = msg
 	return e
 }
 
@@ -50,50 +66,86 @@ func (e *RequestError) SetMessage(msg string) *RequestError {
 // will also include the error UUID in the output so that the user can report that
 // and link the response to a specific error in the logs.
 func (e *RequestError) AbortWithStatus(status int, c *gin.Context) {
+	// In instances where the status has already been set just use that existing status
+	// since we cannot change it at this point, and trying to do so will emit a gin warning
+	// into the program output.
+	if c.Writer.Status() != 200 {
+		status = c.Writer.Status()
+	}
+
 	// If this error is because the resource does not exist, we likely do not need to log
 	// the error anywhere, just return a 404 and move on with our lives.
-	if os.IsNotExist(e.Err) {
+	if errors.Is(e.err, os.ErrNotExist) {
+		e.logger().Debug("encountered os.IsNotExist error while handling request")
 		c.AbortWithStatusJSON(http.StatusNotFound, gin.H{
 			"error": "The requested resource was not found on the system.",
 		})
 		return
 	}
 
+	if strings.HasPrefix(e.err.Error(), "invalid URL escape") {
+		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+			"error": "Some of the data provided in the request appears to be escaped improperly.",
+		})
+		return
+	}
+
+	// If this is a Filesystem error just return it without all of the tracking code nonsense
+	// since we don't need to be logging it into the logs or anything, its just a normal error
+	// that the user can solve on their end.
+	if st, msg := e.getAsFilesystemError(); st != 0 {
+		c.AbortWithStatusJSON(st, gin.H{"error": msg})
+		return
+	}
+
 	// Otherwise, log the error to zap, and then report the error back to the user.
 	if status >= 500 {
-		if e.server != nil {
-			zap.S().Errorw("encountered error while handling HTTP request", zap.String("server", e.server.Uuid), zap.String("error_id", e.Uuid), zap.Error(e.Err))
-		} else {
-			zap.S().Errorw("encountered error while handling HTTP request", zap.String("error_id", e.Uuid), zap.Error(e.Err))
-		}
-
-		c.Error(errors.WithStack(e))
+		e.logger().Error("unexpected error while handling HTTP request")
 	} else {
-		if e.server != nil {
-			zap.S().Debugw("encountered error while handling HTTP request", zap.String("server", e.server.Uuid), zap.String("error_id", e.Uuid), zap.Error(e.Err))
-		} else {
-			zap.S().Debugw("encountered error while handling HTTP request", zap.String("error_id", e.Uuid), zap.Error(e.Err))
-		}
+		e.logger().Debug("non-server error encountered while handling HTTP request")
 	}
 
-	msg := "An unexpected error was encountered while processing this request."
-	if e.Message != "" {
-		msg = e.Message
+	if e.message == "" {
+		e.message = "An unexpected error was encountered while processing this request."
 	}
 
-	c.AbortWithStatusJSON(status, gin.H{
-		"error":    msg,
-		"error_id": e.Uuid,
-	})
+	c.AbortWithStatusJSON(status, gin.H{"error": e.message, "error_id": e.uuid})
 }
 
 // Helper function to just abort with an internal server error. This is generally the response
 // from most errors encountered by the API.
-func (e *RequestError) AbortWithServerError(c *gin.Context) {
+func (e *RequestError) Abort(c *gin.Context) {
 	e.AbortWithStatus(http.StatusInternalServerError, c)
 }
 
+// Looks at the given RequestError and determines if it is a specific filesystem error that
+// we can process and return differently for the user.
+func (e *RequestError) getAsFilesystemError() (int, string) {
+	err := errors.Unwrap(e.err)
+	if err == nil {
+		return 0, ""
+	}
+	if errors.Is(err, os.ErrNotExist) || filesystem.IsErrorCode(err, filesystem.ErrCodePathResolution) {
+		return http.StatusNotFound, "The requested resource was not found on the system."
+	}
+	if filesystem.IsErrorCode(err, filesystem.ErrCodeDiskSpace) {
+		return http.StatusConflict, "There is not enough disk space available to perform that action."
+	}
+	if strings.HasSuffix(err.Error(), "file name too long") {
+		return http.StatusBadRequest, "Cannot perform that action: file name is too long."
+	}
+	if e, ok := err.(*os.SyscallError); ok && e.Syscall == "readdirent" {
+		return http.StatusNotFound, "The requested directory does not exist."
+	}
+	return 0, ""
+}
+
+// Handle specific filesystem errors for a server.
+func (e *RequestError) AbortFilesystemError(c *gin.Context) {
+	e.Abort(c)
+}
+
 // Format the error to a string and include the UUID.
 func (e *RequestError) Error() string {
-	return fmt.Sprintf("%v (uuid: %s)", e.Err, e.Uuid)
+	return fmt.Sprintf("%v (uuid: %s)", e.err, e.uuid)
 }

router/middleware.go

@@ -1,67 +1,130 @@
 package router
 
 import (
+	"emperror.dev/errors"
 	"github.com/gin-gonic/gin"
 	"github.com/google/uuid"
 	"github.com/pterodactyl/wings/config"
 	"github.com/pterodactyl/wings/server"
+	"io"
 	"net/http"
 	"strings"
 )
 
+type Middleware struct{}
+
+// A custom handler function allowing for errors bubbled up by c.Error() to be returned in a
+// standardized format with tracking UUIDs on them for easier log searching.
+func (m *Middleware) ErrorHandler() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		c.Next()
+		err := c.Errors.Last()
+		if err == nil || err.Err == nil {
+			return
+		}
+		tracked := NewTrackedError(err.Err)
+		// If there is a server in the context for this request pull it out so that we can
+		// track the error specifically for that server.
+		if s, ok := c.Get("server"); ok {
+			tracked = NewServerError(err.Err, s.(*server.Server))
+		}
+		// This error occurs if you submit invalid JSON data to an endpoint.
+		if err.Err.Error() == io.EOF.Error() {
+			c.JSON(c.Writer.Status(), gin.H{"error": "A JSON formatted body is required for this endpoint."})
+			return
+		}
+		tracked.Abort(c)
+		return
+	}
+}
+
 // Set the access request control headers on all of the requests.
-func SetAccessControlHeaders(c *gin.Context) {
-	c.Header("Access-Control-Allow-Origin", config.Get().PanelLocation)
-	c.Header("Access-Control-Allow-Headers", "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
-	c.Next()
+func (m *Middleware) SetAccessControlHeaders() gin.HandlerFunc {
+	origins := config.Get().AllowedOrigins
+	location := config.Get().PanelLocation
+	return func(c *gin.Context) {
+		c.Header("Access-Control-Allow-Credentials", "true")
+		c.Header("Access-Control-Allow-Methods", "GET, POST, PATCH, PUT, DELETE, OPTIONS")
+		c.Header("Access-Control-Allow-Headers", "Accept, Accept-Encoding, Authorization, Cache-Control, Content-Type, Content-Length, Origin, X-Real-IP, X-CSRF-Token")
+
+		o := c.GetHeader("Origin")
+		if o != location {
+			for _, origin := range origins {
+				if origin != "*" && o != origin {
+					continue
+				}
+				c.Header("Access-Control-Allow-Origin", origin)
+				c.Next()
+				return
+			}
+		}
+		c.Header("Access-Control-Allow-Origin", location)
+		c.Next()
+	}
 }
 
 // Authenticates the request token against the given permission string, ensuring that
 // if it is a server permission, the token has control over that server. If it is a global
 // token, this will ensure that the request is using a properly signed global token.
-func AuthorizationMiddleware(c *gin.Context) {
-	auth := strings.SplitN(c.GetHeader("Authorization"), " ", 2)
+func (m *Middleware) RequireAuthorization() gin.HandlerFunc {
+	token := config.Get().AuthenticationToken
+	return func(c *gin.Context) {
+		auth := strings.SplitN(c.GetHeader("Authorization"), " ", 2)
+		if len(auth) != 2 || auth[0] != "Bearer" {
+			c.Header("WWW-Authenticate", "Bearer")
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
+				"error": "The required authorization heads were not present in the request.",
+			})
+			return
+		}
 
-	if len(auth) != 2 || auth[0] != "Bearer" {
-		c.Header("WWW-Authenticate", "Bearer")
-		c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
-			"error": "The required authorization heads were not present in the request.",
+		// All requests to Wings must be authorized with the authentication token present in
+		// the Wings configuration file. Remeber, all requests to Wings come from the Panel
+		// backend, or using a signed JWT for temporary authentication.
+		if auth[1] == token {
+			c.Next()
+			return
+		}
+		c.AbortWithStatusJSON(http.StatusForbidden, gin.H{
+			"error": "You are not authorized to access this endpoint.",
 		})
-
-		return
 	}
-
-	// Try to match the request against the global token for the Daemon, regardless
-	// of the permission type. If nothing is matched we will fall through to the Panel
-	// API to try and validate permissions for a server.
-	if auth[1] == config.Get().AuthenticationToken {
-		c.Next()
-
-		return
-	}
-
-	c.AbortWithStatusJSON(http.StatusForbidden, gin.H{
-		"error": "You are not authorized to access this endpoint.",
-	})
 }
 
 // Helper function to fetch a server out of the servers collection stored in memory.
+//
+// This function should not be used in new controllers, prefer ExtractServer where
+// possible.
 func GetServer(uuid string) *server.Server {
 	return server.GetServers().Find(func(s *server.Server) bool {
-		return uuid == s.Uuid
+		return uuid == s.Id()
 	})
 }
 
 // Ensure that the requested server exists in this setup. Returns a 404 if we cannot
 // locate it.
-func ServerExists(c *gin.Context) {
-	u, err := uuid.Parse(c.Param("server"))
-	if err != nil || GetServer(u.String()) == nil {
+func (m *Middleware) ServerExists() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		u, err := uuid.Parse(c.Param("server"))
+		if err == nil {
+			if s := GetServer(u.String()); s != nil {
+				c.Set("server", s)
+				c.Next()
+				return
+			}
+		}
 		c.AbortWithStatusJSON(http.StatusNotFound, gin.H{
 			"error": "The resource you requested does not exist.",
 		})
-		return
 	}
-
-	c.Next()
+}
+
+// Returns the server instance from the gin context. If there is no server set in the
+// context (e.g. calling from a controller not protected by ServerExists) this function
+// will panic.
+func ExtractServer(c *gin.Context) *server.Server {
+	if s, ok := c.Get("server"); ok {
+		return s.(*server.Server)
+	}
+	panic(errors.New("cannot extract server, missing on gin context"))
 }

router/router.go

@@ -1,13 +1,31 @@
 package router
 
 import (
+	"github.com/apex/log"
 	"github.com/gin-gonic/gin"
 )
 
 // Configures the routing infrastructure for this daemon instance.
 func Configure() *gin.Engine {
-	router := gin.Default()
-	router.Use(SetAccessControlHeaders)
+	gin.SetMode("release")
+
+	m := Middleware{}
+	router := gin.New()
+	router.Use(gin.Recovery(), m.ErrorHandler(), m.SetAccessControlHeaders())
+	// @todo log this into a different file so you can setup IP blocking for abusive requests and such.
+	// This should still dump requests in debug mode since it does help with understanding the request
+	// lifecycle and quickly seeing what was called leading to the logs. However, it isn't feasible to mix
+	// this output in production and still get meaningful logs from it since they'll likely just be a huge
+	// spamfest.
+	router.Use(gin.LoggerWithFormatter(func(params gin.LogFormatterParams) string {
+		log.WithFields(log.Fields{
+			"client_ip": params.ClientIP,
+			"status":    params.StatusCode,
+			"latency":   params.Latency,
+		}).Debugf("%s %s", params.MethodColor()+params.Method+params.ResetColor(), params.Path)
+
+		return ""
+	}))
 
 	router.OPTIONS("/api/system", func(c *gin.Context) {
 		c.Status(200)
@@ -16,20 +34,21 @@ func Configure() *gin.Engine {
 	// These routes use signed URLs to validate access to the resource being requested.
 	router.GET("/download/backup", getDownloadBackup)
 	router.GET("/download/file", getDownloadFile)
+	router.POST("/upload/file", postServerUploadFiles)
 
 	// This route is special it sits above all of the other requests because we are
 	// using a JWT to authorize access to it, therefore it needs to be publicly
 	// accessible.
-	router.GET("/api/servers/:server/ws", ServerExists, getServerWebsocket)
+	router.GET("/api/servers/:server/ws", m.ServerExists(), getServerWebsocket)
 
 	// This request is called by another daemon when a server is going to be transferred out.
 	// This request does not need the AuthorizationMiddleware as the panel should never call it
 	// and requests are authenticated through a JWT the panel issues to the other daemon.
-	router.GET("/api/servers/:server/archive", ServerExists, getServerArchive)
+	router.GET("/api/servers/:server/archive", m.ServerExists(), getServerArchive)
 
 	// All of the routes beyond this mount will use an authorization middleware
 	// and will not be accessible without the correct Authorization header provided.
-	protected := router.Use(AuthorizationMiddleware)
+	protected := router.Use(m.RequireAuthorization())
 	protected.POST("/api/update", postUpdateConfiguration)
 	protected.GET("/api/system", getSystemInformation)
 	protected.GET("/api/servers", getAllServers)
@@ -39,7 +58,7 @@ func Configure() *gin.Engine {
 	// These are server specific routes, and require that the request be authorized, and
 	// that the server exist on the Daemon.
 	server := router.Group("/api/servers/:server")
-	server.Use(AuthorizationMiddleware, ServerExists)
+	server.Use(m.RequireAuthorization(), m.ServerExists())
 	{
 		server.GET("", getServer)
 		server.PATCH("", patchServer)
@@ -50,6 +69,7 @@ func Configure() *gin.Engine {
 		server.POST("/commands", postServerCommands)
 		server.POST("/install", postServerInstall)
 		server.POST("/reinstall", postServerReinstall)
+		server.POST("/ws/deny", postServerDenyWSTokens)
 
 		// This archive request causes the archive to start being created
 		// this should only be triggered by the panel.
@@ -59,11 +79,18 @@ func Configure() *gin.Engine {
 		{
 			files.GET("/contents", getServerFileContents)
 			files.GET("/list-directory", getServerListDirectory)
-			files.PUT("/rename", putServerRenameFile)
+			files.PUT("/rename", putServerRenameFiles)
 			files.POST("/copy", postServerCopyFile)
 			files.POST("/write", postServerWriteFile)
 			files.POST("/create-directory", postServerCreateDirectory)
-			files.POST("/delete", postServerDeleteFile)
+			files.POST("/delete", postServerDeleteFiles)
+			files.POST("/compress", postServerCompressFiles)
+			files.POST("/decompress", postServerDecompressFiles)
+			files.POST("/chmod", postServerChmodFile)
+
+			files.GET("/pull", getServerPullingFiles)
+			files.POST("/pull", postServerPullRemoteFile)
+			files.DELETE("/pull/:download", deleteServerPullRemoteFile)
 		}
 
 		backup := server.Group("/backup")

router/router_download.go

@@ -2,6 +2,7 @@ package router
 
 import (
 	"bufio"
+	"errors"
 	"github.com/gin-gonic/gin"
 	"github.com/pterodactyl/wings/router/tokens"
 	"github.com/pterodactyl/wings/server/backup"
@@ -14,7 +15,7 @@ import (
 func getDownloadBackup(c *gin.Context) {
 	token := tokens.BackupPayload{}
 	if err := tokens.ParseToken([]byte(c.Query("token")), &token); err != nil {
-		TrackedError(err).AbortWithServerError(c)
+		NewTrackedError(err).Abort(c)
 		return
 	}
 
@@ -28,20 +29,20 @@ func getDownloadBackup(c *gin.Context) {
 
 	b, st, err := backup.LocateLocal(token.BackupUuid)
 	if err != nil {
-		if os.IsNotExist(err) {
+		if errors.Is(err, os.ErrNotExist) {
 			c.AbortWithStatusJSON(http.StatusNotFound, gin.H{
 				"error": "The requested backup was not found on this server.",
 			})
 			return
 		}
 
-		TrackedServerError(err, s).AbortWithServerError(c)
+		NewServerError(err, s).Abort(c)
 		return
 	}
 
 	f, err := os.Open(b.Path())
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		NewServerError(err, s).Abort(c)
 		return
 	}
 	defer f.Close()
@@ -57,7 +58,7 @@ func getDownloadBackup(c *gin.Context) {
 func getDownloadFile(c *gin.Context) {
 	token := tokens.FilePayload{}
 	if err := tokens.ParseToken([]byte(c.Query("token")), &token); err != nil {
-		TrackedError(err).AbortWithServerError(c)
+		NewTrackedError(err).Abort(c)
 		return
 	}
 
@@ -69,12 +70,12 @@ func getDownloadFile(c *gin.Context) {
 		return
 	}
 
-	p, _ := s.Filesystem.SafePath(token.FilePath)
+	p, _ := s.Filesystem().SafePath(token.FilePath)
 	st, err := os.Stat(p)
 	// If there is an error or we're somehow trying to download a directory, just
 	// respond with the appropriate error.
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		NewServerError(err, s).Abort(c)
 		return
 	} else if st.IsDir() {
 		c.AbortWithStatusJSON(http.StatusNotFound, gin.H{
@@ -85,7 +86,7 @@ func getDownloadFile(c *gin.Context) {
 
 	f, err := os.Open(p)
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		NewServerError(err, s).Abort(c)
 		return
 	}
 
@@ -94,4 +95,4 @@ func getDownloadFile(c *gin.Context) {
 	c.Header("Content-Type", "application/octet-stream")
 
 	bufio.NewReader(f).WriteTo(c.Writer)
-}
+}

router/router_server.go

@@ -2,32 +2,47 @@ package router
 
 import (
 	"bytes"
+	"context"
+	"emperror.dev/errors"
+	"github.com/apex/log"
 	"github.com/gin-gonic/gin"
-	"github.com/pkg/errors"
+	"github.com/pterodactyl/wings/router/downloader"
+	"github.com/pterodactyl/wings/router/tokens"
 	"github.com/pterodactyl/wings/server"
-	"go.uber.org/zap"
 	"net/http"
 	"os"
 	"strconv"
 )
 
+type serverProcData struct {
+	server.ResourceUsage
+	Suspended bool `json:"suspended"`
+}
+
 // Returns a single server from the collection of servers.
 func getServer(c *gin.Context) {
-	c.JSON(http.StatusOK, GetServer(c.Param("server")))
+	s := GetServer(c.Param("server"))
+
+	c.JSON(http.StatusOK, serverProcData{
+		ResourceUsage: s.Proc(),
+		Suspended:     s.IsSuspended(),
+	})
 }
 
 // Returns the logs for a given server instance.
 func getServerLogs(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 
-	l, _ := strconv.ParseInt(c.DefaultQuery("size", "8192"), 10, 64)
+	l, _ := strconv.Atoi(c.DefaultQuery("size", "100"))
 	if l <= 0 {
-		l = 2048
+		l = 100
+	} else if l > 100 {
+		l = 100
 	}
 
 	out, err := s.ReadLogfile(l)
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		NewServerError(err, s).Abort(c)
 		return
 	}
 
@@ -45,10 +60,15 @@ func getServerLogs(c *gin.Context) {
 func postServerPower(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 
-	var data server.PowerAction
-	c.BindJSON(&data)
+	var data struct {
+		Action server.PowerAction `json:"action"`
+	}
 
-	if !data.IsValid() {
+	if err := c.BindJSON(&data); err != nil {
+		return
+	}
+
+	if !data.Action.IsValid() {
 		c.AbortWithStatusJSON(http.StatusUnprocessableEntity, gin.H{
 			"error": "The power action provided was not valid, should be one of \"stop\", \"start\", \"restart\", \"kill\"",
 		})
@@ -61,25 +81,27 @@ func postServerPower(c *gin.Context) {
 	//
 	// We don't really care about any of the other actions at this point, they'll all result
 	// in the process being stopped, which should have happened anyways if the server is suspended.
-	if (data.Action == "start" || data.Action == "restart") && s.Suspended {
+	if (data.Action == server.PowerActionStart || data.Action == server.PowerActionRestart) && s.IsSuspended() {
 		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
 			"error": "Cannot start or restart a server that is suspended.",
 		})
 		return
 	}
 
-	// Pass the actual heavy processing off to a seperate thread to handle so that
+	// Pass the actual heavy processing off to a separate thread to handle so that
 	// we can immediately return a response from the server. Some of these actions
 	// can take quite some time, especially stopping or restarting.
-	go func() {
-		if err := s.HandlePowerAction(data); err != nil {
-			zap.S().Errorw(
-				"encountered an error processing a server power action",
-				zap.String("server", s.Uuid),
-				zap.Error(err),
-			)
+	go func(s *server.Server) {
+		if err := s.HandlePowerAction(data.Action, 30); err != nil {
+			if errors.Is(err, context.DeadlineExceeded) {
+				s.Log().WithField("action", data.Action).
+					Warn("could not acquire a lock while attempting to perform a power action")
+			} else {
+				s.Log().WithFields(log.Fields{"action": data, "error": err}).
+					Error("encountered error processing a server power action in the background")
+			}
 		}
-	}()
+	}(s)
 
 	c.Status(http.StatusAccepted)
 }
@@ -89,7 +111,7 @@ func postServerCommands(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 
 	if running, err := s.Environment.IsRunning(); err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		NewServerError(err, s).Abort(c)
 		return
 	} else if !running {
 		c.AbortWithStatusJSON(http.StatusBadGateway, gin.H{
@@ -98,17 +120,17 @@ func postServerCommands(c *gin.Context) {
 		return
 	}
 
-	var data struct{ Commands []string `json:"commands"` }
-	c.BindJSON(&data)
+	var data struct {
+		Commands []string `json:"commands"`
+	}
+	// BindJSON sends 400 if the request fails, all we need to do is return
+	if err := c.BindJSON(&data); err != nil {
+		return
+	}
 
 	for _, command := range data.Commands {
 		if err := s.Environment.SendCommand(command); err != nil {
-			zap.S().Warnw(
-				"failed to send command to server",
-				zap.String("server", s.Uuid),
-				zap.String("command", command),
-				zap.Error(err),
-			)
+			s.Log().WithFields(log.Fields{"command": command, "error": err}).Warn("failed to send command to server instance")
 		}
 	}
 
@@ -122,11 +144,13 @@ func patchServer(c *gin.Context) {
 	buf := bytes.Buffer{}
 	buf.ReadFrom(c.Request.Body)
 
-	if err := s.UpdateDataStructure(buf.Bytes(), true); err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+	if err := s.UpdateDataStructure(buf.Bytes()); err != nil {
+		NewServerError(err, s).Abort(c)
 		return
 	}
 
+	s.SyncWithEnvironment()
+
 	c.Status(http.StatusNoContent)
 }
 
@@ -135,12 +159,8 @@ func postServerInstall(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 
 	go func(serv *server.Server) {
-		if err := serv.Install(); err != nil {
-			zap.S().Errorw(
-				"failed to execute server installation process",
-				zap.String("server", serv.Uuid),
-				zap.Error(err),
-			)
+		if err := serv.Install(true); err != nil {
+			serv.Log().WithField("error", err).Error("failed to execute server installation process")
 		}
 	}(s)
 
@@ -151,41 +171,54 @@ func postServerInstall(c *gin.Context) {
 func postServerReinstall(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 
-	go func(serv *server.Server) {
-		if err := serv.Reinstall(); err != nil {
-			zap.S().Errorw(
-				"failed to complete server reinstall process",
-				zap.String("server", serv.Uuid),
-				zap.Error(err),
-			)
+	if s.ExecutingPowerAction() {
+		c.AbortWithStatusJSON(http.StatusConflict, gin.H{
+			"error": "Cannot execute server reinstall event while another power action is running.",
+		})
+		return
+	}
+
+	go func(s *server.Server) {
+		if err := s.Reinstall(); err != nil {
+			s.Log().WithField("error", err).Error("failed to complete server re-install process")
 		}
 	}(s)
 
 	c.Status(http.StatusAccepted)
 }
 
-// Deletes a server from the wings daemon and deassociates its objects.
+// Deletes a server from the wings daemon and dissociate it's objects.
 func deleteServer(c *gin.Context) {
-	s := GetServer(c.Param("server"))
+	s := ExtractServer(c)
 
 	// Immediately suspend the server to prevent a user from attempting
 	// to start it while this process is running.
-	s.Suspended = true
+	s.Config().SetSuspended(true)
+
+	// Stop all running background tasks for this server that are using the context on
+	// the server struct. This will cancel any running install processes for the server
+	// as well.
+	s.CtxCancel()
+	s.Events().Destroy()
+	s.Websockets().CancelAll()
 
 	// Delete the server's archive if it exists. We intentionally don't return
 	// here, if the archive fails to delete, the server can still be removed.
 	if err := s.Archiver.DeleteIfExists(); err != nil {
-		zap.S().Warnw("failed to delete server archive during deletion process", zap.String("server", s.Uuid), zap.Error(err))
+		s.Log().WithField("error", err).Warn("failed to delete server archive during deletion process")
 	}
 
-	// Unsubscribe all of the event listeners.
-	s.Events().UnsubscribeAll()
+	// Remove any pending remote file downloads for the server.
+	for _, dl := range downloader.ByServer(s.Id()) {
+		dl.Cancel()
+	}
 
 	// Destroy the environment; in Docker this will handle a running container and
 	// forcibly terminate it before removing the container, so we do not need to handle
 	// that here.
 	if err := s.Environment.Destroy(); err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		WithError(c, err)
+		return
 	}
 
 	// Once the environment is terminated, remove the server files from the system. This is
@@ -196,13 +229,13 @@ func deleteServer(c *gin.Context) {
 	// so we don't want to block the HTTP call while waiting on this.
 	go func(p string) {
 		if err := os.RemoveAll(p); err != nil {
-			zap.S().Warnw("failed to remove server files during deletion process", zap.String("path", p), zap.Error(errors.WithStack(err)))
+			log.WithFields(log.Fields{"path": p, "error": err}).Warn("failed to remove server files during deletion process")
 		}
-	}(s.Filesystem.Path())
+	}(s.Filesystem().Path())
 
-	var uuid = s.Uuid
+	uuid := s.Id()
 	server.GetServers().Remove(func(s2 *server.Server) bool {
-		return s2.Uuid == uuid
+		return s2.Id() == uuid
 	})
 
 	// Deallocate the reference to this server.
@@ -210,3 +243,22 @@ func deleteServer(c *gin.Context) {
 
 	c.Status(http.StatusNoContent)
 }
+
+// Adds any of the JTIs passed through in the body to the deny list for the websocket
+// preventing any JWT generated before the current time from being used to connect to
+// the socket or send along commands.
+func postServerDenyWSTokens(c *gin.Context) {
+	var data struct {
+		JTIs []string `json:"jtis"`
+	}
+
+	if err := c.BindJSON(&data); err != nil {
+		return
+	}
+
+	for _, jti := range data.JTIs {
+		tokens.DenyJTI(jti)
+	}
+
+	c.Status(http.StatusNoContent)
+}

router/router_server_backup.go

@@ -1,13 +1,13 @@
 package router
 
 import (
-	"errors"
+	"emperror.dev/errors"
 	"fmt"
 	"github.com/gin-gonic/gin"
 	"github.com/pterodactyl/wings/server"
 	"github.com/pterodactyl/wings/server/backup"
-	"go.uber.org/zap"
 	"net/http"
+	"os"
 )
 
 // Backs up a server.
@@ -15,7 +15,10 @@ func postServerBackup(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 
 	data := &backup.Request{}
-	c.BindJSON(&data)
+	// BindJSON sends 400 if the request fails, all we need to do is return
+	if err := c.BindJSON(&data); err != nil {
+		return
+	}
 
 	var adapter backup.BackupInterface
 	var err error
@@ -31,33 +34,52 @@ func postServerBackup(c *gin.Context) {
 	}
 
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		NewServerError(err, s).Abort(c)
 		return
 	}
 
+	// Attach the server ID to the backup log output for easier parsing.
+	adapter.WithLogContext(map[string]interface{}{
+		"server": s.Id(),
+	})
+
 	go func(b backup.BackupInterface, serv *server.Server) {
 		if err := serv.Backup(b); err != nil {
-			zap.S().Errorw("failed to generate backup for server", zap.Error(err))
+			serv.Log().WithField("error", errors.WithStackIf(err)).Error("failed to generate backup for server")
 		}
 	}(adapter, s)
 
-
 	c.Status(http.StatusAccepted)
 }
 
-// Deletes a local backup of a server.
+// Deletes a local backup of a server. If the backup is not found on the machine just return
+// a 404 error. The service calling this endpoint can make its own decisions as to how it wants
+// to handle that response.
 func deleteServerBackup(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 
 	b, _, err := backup.LocateLocal(c.Param("backup"))
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		// Just return from the function at this point if the backup was not located.
+		if errors.Is(err, os.ErrNotExist) {
+			c.AbortWithStatusJSON(http.StatusNotFound, gin.H{
+				"error": "The requested backup was not found on this server.",
+			})
+			return
+		}
+
+		NewServerError(err, s).Abort(c)
 		return
 	}
 
 	if err := b.Remove(); err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
-		return
+		// I'm not entirely sure how likely this is to happen, however if we did manage to locate
+		// the backup previously and it is now missing when we go to delete, just treat it as having
+		// been successful, rather than returning a 404.
+		if !errors.Is(err, os.ErrNotExist) {
+			NewServerError(err, s).Abort(c)
+			return
+		}
 	}
 
 	c.Status(http.StatusNoContent)

router/router_server_files.go

@@ -1,44 +1,37 @@
 package router
 
 import (
-	"bufio"
-	"github.com/gin-gonic/gin"
+	"context"
+	"mime/multipart"
 	"net/http"
+	"net/url"
 	"os"
+	"path"
+	"path/filepath"
 	"strconv"
+	"strings"
+
+	"emperror.dev/errors"
+	"github.com/apex/log"
+	"github.com/gin-gonic/gin"
+	"github.com/pterodactyl/wings/router/downloader"
+	"github.com/pterodactyl/wings/router/tokens"
+	"github.com/pterodactyl/wings/server"
+	"github.com/pterodactyl/wings/server/filesystem"
+	"golang.org/x/sync/errgroup"
 )
 
 // Returns the contents of a file on the server.
 func getServerFileContents(c *gin.Context) {
-	s := GetServer(c.Param("server"))
-	cleaned, err := s.Filesystem.SafePath(c.Query("file"))
+	s := ExtractServer(c)
+	f := c.Query("file")
+	p := "/" + strings.TrimLeft(f, "/")
+	st, err := s.Filesystem().Stat(p)
 	if err != nil {
-		c.AbortWithStatusJSON(http.StatusNotFound, gin.H{
-			"error": "The file requested could not be found.",
-		})
+		WithError(c, err)
 		return
 	}
 
-	st, err := s.Filesystem.Stat(cleaned)
-	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
-		return
-	}
-
-	if st.Info.IsDir() {
-		c.AbortWithStatusJSON(http.StatusNotFound, gin.H{
-			"error": "The requested resource was not found on the system.",
-		})
-		return
-	}
-
-	f, err := os.Open(cleaned)
-	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
-		return
-	}
-	defer f.Close()
-
 	c.Header("X-Mime-Type", st.Mimetype)
 	c.Header("Content-Length", strconv.Itoa(int(st.Info.Size())))
 
@@ -49,41 +42,94 @@ func getServerFileContents(c *gin.Context) {
 		c.Header("Content-Type", "application/octet-stream")
 	}
 
-	bufio.NewReader(f).WriteTo(c.Writer)
+	// TODO(dane): should probably come up with a different approach here. If an error is encountered
+	//  by this Readfile call you'll end up causing a (recovered) panic in the program because so many
+	//  headers have already been set. We should probably add a RawReadfile that just returns the file
+	//  to be read and then we can stream from that safely without error.
+	//
+	// Until that becomes a problem though I'm just going to leave this how it is. The panic is recovered
+	// and a normal 500 error is returned to the client to my knowledge. It is also very unlikely to
+	// happen since we're doing so much before this point that would normally throw an error if there
+	// was a problem with the file.
+	if err := s.Filesystem().Readfile(p, c.Writer); err != nil {
+		WithError(c, err)
+		return
+	}
+	c.Writer.Flush()
 }
 
 // Returns the contents of a directory for a server.
 func getServerListDirectory(c *gin.Context) {
+	s := ExtractServer(c)
+	dir := c.Query("directory")
+	if stats, err := s.Filesystem().ListDirectory(dir); err != nil {
+		WithError(c, err)
+	} else {
+		c.JSON(http.StatusOK, stats)
+	}
+}
+
+type renameFile struct {
+	To   string `json:"to"`
+	From string `json:"from"`
+}
+
+// Renames (or moves) files for a server.
+func putServerRenameFiles(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 
-	stats, err := s.Filesystem.ListDirectory(c.Query("directory"))
-	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+	var data struct {
+		Root  string       `json:"root"`
+		Files []renameFile `json:"files"`
+	}
+	// BindJSON sends 400 if the request fails, all we need to do is return
+	if err := c.BindJSON(&data); err != nil {
 		return
 	}
 
-	c.JSON(http.StatusOK, stats)
-}
-
-// Renames (or moves) a file for a server.
-func putServerRenameFile(c *gin.Context) {
-	s := GetServer(c.Param("server"))
-
-	var data struct{
-		RenameFrom string `json:"rename_from"`
-		RenameTo string `json:"rename_to"`
-	}
-	c.BindJSON(&data)
-
-	if data.RenameFrom == "" || data.RenameTo == "" {
+	if len(data.Files) == 0 {
 		c.AbortWithStatusJSON(http.StatusUnprocessableEntity, gin.H{
-			"error": "Invalid paths were provided, did you forget to provide both a new and old path?",
+			"error": "No files to move or rename were provided.",
 		})
 		return
 	}
 
-	if err := s.Filesystem.Rename(data.RenameFrom, data.RenameTo); err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+	g, ctx := errgroup.WithContext(context.Background())
+
+	// Loop over the array of files passed in and perform the move or rename action against each.
+	for _, p := range data.Files {
+		pf := path.Join(data.Root, p.From)
+		pt := path.Join(data.Root, p.To)
+
+		g.Go(func() error {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			default:
+				if err := s.Filesystem().Rename(pf, pt); err != nil {
+					// Return nil if the error is an is not exists.
+					// NOTE: os.IsNotExist() does not work if the error is wrapped.
+					if errors.Is(err, os.ErrNotExist) {
+						return nil
+					}
+
+					return err
+				}
+
+				return nil
+			}
+		})
+	}
+
+	if err := g.Wait(); err != nil {
+		if errors.Is(err, os.ErrExist) {
+			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+				"error": "Cannot move or rename file, destination already exists.",
+			})
+			return
+		}
+
+		NewServerError(err, s).AbortFilesystemError(c)
 		return
 	}
 
@@ -97,27 +143,58 @@ func postServerCopyFile(c *gin.Context) {
 	var data struct {
 		Location string `json:"location"`
 	}
-	c.BindJSON(&data)
+	// BindJSON sends 400 if the request fails, all we need to do is return
+	if err := c.BindJSON(&data); err != nil {
+		return
+	}
 
-	if err := s.Filesystem.Copy(data.Location); err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+	if err := s.Filesystem().Copy(data.Location); err != nil {
+		NewServerError(err, s).AbortFilesystemError(c)
 		return
 	}
 
 	c.Status(http.StatusNoContent)
 }
 
-// Deletes a server file.
-func postServerDeleteFile(c *gin.Context) {
+// Deletes files from a server.
+func postServerDeleteFiles(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 
 	var data struct {
-		Location string `json:"location"`
+		Root  string   `json:"root"`
+		Files []string `json:"files"`
 	}
-	c.BindJSON(&data)
 
-	if err := s.Filesystem.Delete(data.Location); err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+	if err := c.BindJSON(&data); err != nil {
+		return
+	}
+
+	if len(data.Files) == 0 {
+		c.AbortWithStatusJSON(http.StatusUnprocessableEntity, gin.H{
+			"error": "No files were specified for deletion.",
+		})
+		return
+	}
+
+	g, ctx := errgroup.WithContext(context.Background())
+
+	// Loop over the array of files passed in and delete them. If any of the file deletions
+	// fail just abort the process entirely.
+	for _, p := range data.Files {
+		pi := path.Join(data.Root, p)
+
+		g.Go(func() error {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			default:
+				return s.Filesystem().Delete(pi)
+			}
+		})
+	}
+
+	if err := g.Wait(); err != nil {
+		NewServerError(err, s).Abort(c)
 		return
 	}
 
@@ -128,14 +205,99 @@ func postServerDeleteFile(c *gin.Context) {
 func postServerWriteFile(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 
-	if err := s.Filesystem.Writefile(c.Query("file"), c.Request.Body); err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+	f := c.Query("file")
+	f = "/" + strings.TrimLeft(f, "/")
+
+	if err := s.Filesystem().Writefile(f, c.Request.Body); err != nil {
+		if filesystem.IsErrorCode(err, filesystem.ErrCodeIsDirectory) {
+			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+				"error": "Cannot write file, name conflicts with an existing directory by the same name.",
+			})
+			return
+		}
+
+		NewServerError(err, s).AbortFilesystemError(c)
 		return
 	}
 
 	c.Status(http.StatusNoContent)
 }
 
+// Returns all of the currently in-progress file downloads and their current download
+// progress. The progress is also pushed out via a websocket event allowing you to just
+// call this once to get current downloads, and then listen to targeted websocket events
+// with the current progress for everything.
+func getServerPullingFiles(c *gin.Context) {
+	s := ExtractServer(c)
+	c.JSON(http.StatusOK, gin.H{
+		"downloads": downloader.ByServer(s.Id()),
+	})
+}
+
+// Writes the contents of the remote URL to a file on a server.
+func postServerPullRemoteFile(c *gin.Context) {
+	s := ExtractServer(c)
+	var data struct {
+		URL       string `binding:"required" json:"url"`
+		Directory string `binding:"required,omitempty" json:"directory"`
+	}
+	if err := c.BindJSON(&data); err != nil {
+		return
+	}
+
+	u, err := url.Parse(data.URL)
+	if err != nil {
+		if e, ok := err.(*url.Error); ok {
+			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+				"error": "An error occurred while parsing that URL: " + e.Err.Error(),
+			})
+			return
+		}
+		WithError(c, err)
+		return
+	}
+
+	if err := s.Filesystem().HasSpaceErr(true); err != nil {
+		WithError(c, err)
+		return
+	}
+	// Do not allow more than three simultaneous remote file downloads at one time.
+	if len(downloader.ByServer(s.Id())) >= 3 {
+		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+			"error": "This server has reached its limit of 3 simultaneous remote file downloads at once. Please wait for one to complete before trying again.",
+		})
+		return
+	}
+
+	dl := downloader.New(s, downloader.DownloadRequest{
+		URL:       u,
+		Directory: data.Directory,
+	})
+
+	// Execute this pull in a seperate thread since it may take a long time to complete.
+	go func() {
+		s.Log().WithField("download_id", dl.Identifier).WithField("url", u.String()).Info("starting pull of remote file to disk")
+		if err := dl.Execute(); err != nil {
+			s.Log().WithField("download_id", dl.Identifier).WithField("error", err).Error("failed to pull remote file")
+		} else {
+			s.Log().WithField("download_id", dl.Identifier).Info("completed pull of remote file")
+		}
+	}()
+
+	c.JSON(http.StatusAccepted, gin.H{
+		"identifier": dl.Identifier,
+	})
+}
+
+// Stops a remote file download if it exists and belongs to this server.
+func deleteServerPullRemoteFile(c *gin.Context) {
+	s := ExtractServer(c)
+	if dl := downloader.ByID(c.Param("download")); dl != nil && dl.BelongsTo(s) {
+		dl.Cancel()
+	}
+	c.Status(http.StatusNoContent)
+}
+
 // Create a directory on a server.
 func postServerCreateDirectory(c *gin.Context) {
 	s := GetServer(c.Param("server"))
@@ -144,12 +306,260 @@ func postServerCreateDirectory(c *gin.Context) {
 		Name string `json:"name"`
 		Path string `json:"path"`
 	}
-	c.BindJSON(&data)
+	// BindJSON sends 400 if the request fails, all we need to do is return
+	if err := c.BindJSON(&data); err != nil {
+		return
+	}
 
-	if err := s.Filesystem.CreateDirectory(data.Name, data.Path); err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+	if err := s.Filesystem().CreateDirectory(data.Name, data.Path); err != nil {
+		if err.Error() == "not a directory" {
+			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+				"error": "Part of the path being created is not a directory (ENOTDIR).",
+			})
+			return
+		}
+
+		NewServerError(err, s).Abort(c)
 		return
 	}
 
 	c.Status(http.StatusNoContent)
-}
+}
+
+func postServerCompressFiles(c *gin.Context) {
+	s := GetServer(c.Param("server"))
+
+	var data struct {
+		RootPath string   `json:"root"`
+		Files    []string `json:"files"`
+	}
+
+	if err := c.BindJSON(&data); err != nil {
+		return
+	}
+
+	if len(data.Files) == 0 {
+		c.AbortWithStatusJSON(http.StatusUnprocessableEntity, gin.H{
+			"error": "No files were passed through to be compressed.",
+		})
+		return
+	}
+
+	if !s.Filesystem().HasSpaceAvailable(true) {
+		c.AbortWithStatusJSON(http.StatusConflict, gin.H{
+			"error": "This server does not have enough available disk space to generate a compressed archive.",
+		})
+		return
+	}
+
+	f, err := s.Filesystem().CompressFiles(data.RootPath, data.Files)
+	if err != nil {
+		NewServerError(err, s).AbortFilesystemError(c)
+		return
+	}
+
+	c.JSON(http.StatusOK, &filesystem.Stat{
+		Info:     f,
+		Mimetype: "application/tar+gzip",
+	})
+}
+
+func postServerDecompressFiles(c *gin.Context) {
+	s := GetServer(c.Param("server"))
+
+	var data struct {
+		RootPath string `json:"root"`
+		File     string `json:"file"`
+	}
+
+	if err := c.BindJSON(&data); err != nil {
+		return
+	}
+
+	hasSpace, err := s.Filesystem().SpaceAvailableForDecompression(data.RootPath, data.File)
+	if err != nil {
+		// Handle an unknown format error.
+		if filesystem.IsErrorCode(err, filesystem.ErrCodeUnknownArchive) {
+			s.Log().WithField("error", err).Warn("failed to decompress file due to unknown format")
+			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+				"error": "unknown archive format",
+			})
+			return
+		}
+
+		NewServerError(err, s).Abort(c)
+		return
+	}
+
+	if !hasSpace {
+		c.AbortWithStatusJSON(http.StatusConflict, gin.H{
+			"error": "This server does not have enough available disk space to decompress this archive.",
+		})
+		return
+	}
+
+	if err := s.Filesystem().DecompressFile(data.RootPath, data.File); err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			c.AbortWithStatusJSON(http.StatusNotFound, gin.H{
+				"error": "The requested archive was not found.",
+			})
+			return
+		}
+
+		// If the file is busy for some reason just return a nicer error to the user since there is not
+		// much we specifically can do. They'll need to stop the running server process in order to overwrite
+		// a file like this.
+		if strings.Contains(err.Error(), "text file busy") {
+			s.Log().WithField("error", err).Warn("failed to decompress file due to busy text file")
+
+			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+				"error": "One or more files this archive is attempting to overwrite are currently in use by another process. Please try again.",
+			})
+			return
+		}
+
+		NewServerError(err, s).AbortFilesystemError(c)
+		return
+	}
+
+	c.Status(http.StatusNoContent)
+}
+
+type chmodFile struct {
+	File string `json:"file"`
+	Mode string `json:"mode"`
+}
+
+var errInvalidFileMode = errors.New("invalid file mode")
+
+func postServerChmodFile(c *gin.Context) {
+	s := GetServer(c.Param("server"))
+
+	var data struct {
+		Root  string      `json:"root"`
+		Files []chmodFile `json:"files"`
+	}
+
+	if err := c.BindJSON(&data); err != nil {
+		log.Debug(err.Error())
+		return
+	}
+
+	if len(data.Files) == 0 {
+		c.AbortWithStatusJSON(http.StatusUnprocessableEntity, gin.H{
+			"error": "No files to chmod were provided.",
+		})
+		return
+	}
+
+	g, ctx := errgroup.WithContext(context.Background())
+
+	// Loop over the array of files passed in and perform the move or rename action against each.
+	for _, p := range data.Files {
+		g.Go(func() error {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			default:
+				mode, err := strconv.ParseUint(p.Mode, 8, 32)
+				if err != nil {
+					return errInvalidFileMode
+				}
+
+				if err := s.Filesystem().Chmod(path.Join(data.Root, p.File), os.FileMode(mode)); err != nil {
+					// Return nil if the error is an is not exists.
+					// NOTE: os.IsNotExist() does not work if the error is wrapped.
+					if errors.Is(err, os.ErrNotExist) {
+						return nil
+					}
+
+					return err
+				}
+
+				return nil
+			}
+		})
+	}
+
+	if err := g.Wait(); err != nil {
+		if errors.Is(err, errInvalidFileMode) {
+			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+				"error": "Invalid file mode.",
+			})
+			return
+		}
+
+		NewServerError(err, s).AbortFilesystemError(c)
+		return
+	}
+
+	c.Status(http.StatusNoContent)
+}
+
+func postServerUploadFiles(c *gin.Context) {
+	token := tokens.UploadPayload{}
+	if err := tokens.ParseToken([]byte(c.Query("token")), &token); err != nil {
+		NewTrackedError(err).Abort(c)
+		return
+	}
+
+	s := GetServer(token.ServerUuid)
+	if s == nil || !token.IsUniqueRequest() {
+		c.AbortWithStatusJSON(http.StatusNotFound, gin.H{
+			"error": "The requested resource was not found on this server.",
+		})
+		return
+	}
+
+	form, err := c.MultipartForm()
+	if err != nil {
+		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+			"error": "Failed to get multipart form data from request.",
+		})
+		return
+	}
+
+	headers, ok := form.File["files"]
+	if !ok {
+		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+			"error": "No files were found on the request body.",
+		})
+		return
+	}
+
+	directory := c.Query("directory")
+
+	var totalSize int64
+	for _, header := range headers {
+		totalSize += header.Size
+	}
+
+	for _, header := range headers {
+		p, err := s.Filesystem().SafePath(filepath.Join(directory, header.Filename))
+		if err != nil {
+			NewServerError(err, s).AbortFilesystemError(c)
+			return
+		}
+
+		// We run this in a different method so I can use defer without any of
+		// the consequences caused by calling it in a loop.
+		if err := handleFileUpload(p, s, header); err != nil {
+			NewServerError(err, s).AbortFilesystemError(c)
+			return
+		}
+	}
+}
+
+func handleFileUpload(p string, s *server.Server, header *multipart.FileHeader) error {
+	file, err := header.Open()
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	if err := s.Filesystem().Writefile(p, file); err != nil {
+		return err
+	}
+
+	return nil
+}

router/router_server_ws.go

@@ -6,7 +6,7 @@ import (
 	"github.com/gin-gonic/gin"
 	ws "github.com/gorilla/websocket"
 	"github.com/pterodactyl/wings/router/websocket"
-	"go.uber.org/zap"
+	"time"
 )
 
 // Upgrades a connection to a websocket and passes events along between.
@@ -14,7 +14,7 @@ func getServerWebsocket(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 	handler, err := websocket.GetHandler(s, c.Writer, c.Request)
 	if err != nil {
-		TrackedServerError(err, s).AbortWithServerError(c)
+		NewServerError(err, s).Abort(c)
 		return
 	}
 	defer handler.Connection.Close()
@@ -24,6 +24,28 @@ func getServerWebsocket(c *gin.Context) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
+	// Track this open connection on the server so that we can close them all programmatically
+	// if the server is deleted.
+	s.Websockets().Push(handler.Uuid(), &cancel)
+	defer s.Websockets().Remove(handler.Uuid())
+
+	// Listen for the context being canceled and then close the websocket connection. This normally
+	// just happens because you're disconnecting from the socket in the browser, however in some
+	// cases we close the connections programmatically (e.g. deleting the server) and need to send
+	// a close message to the websocket so it disconnects.
+	go func(ctx context.Context, c *ws.Conn) {
+	ListenerLoop:
+		for {
+			select {
+			case <-ctx.Done():
+				handler.Connection.WriteControl(ws.CloseMessage, ws.FormatCloseMessage(ws.CloseGoingAway, "server deleted"), time.Now().Add(time.Second*5))
+				// A break right here without defining the specific loop would only break the select
+				// and not actually break the for loop, thus causing this routine to stick around forever.
+				break ListenerLoop
+			}
+		}
+	}(ctx, handler.Connection)
+
 	go handler.ListenForServerEvents(ctx)
 	go handler.ListenForExpiration(ctx)
 
@@ -40,7 +62,7 @@ func getServerWebsocket(c *gin.Context) {
 				ws.CloseServiceRestart,
 				ws.CloseAbnormalClosure,
 			) {
-				zap.S().Warnw("error handling websocket message", zap.Error(err))
+				s.Log().WithField("error", err).Warn("error handling websocket message for server")
 			}
 			break
 		}
@@ -52,9 +74,10 @@ func getServerWebsocket(c *gin.Context) {
 			continue
 		}
 
-		if err := handler.HandleInbound(j); err != nil {
-			handler.SendErrorJson(err)
-		}
+		go func(msg websocket.Message) {
+			if err := handler.HandleInbound(msg); err != nil {
+				handler.SendErrorJson(msg, err)
+			}
+		}(j)
 	}
 }
-

router/router_system.go

@@ -2,20 +2,21 @@ package router
 
 import (
 	"bytes"
+	"github.com/apex/log"
 	"github.com/gin-gonic/gin"
 	"github.com/pterodactyl/wings/config"
 	"github.com/pterodactyl/wings/installer"
 	"github.com/pterodactyl/wings/server"
 	"github.com/pterodactyl/wings/system"
-	"go.uber.org/zap"
 	"net/http"
+	"strings"
 )
 
 // Returns information about the system that wings is running on.
 func getSystemInformation(c *gin.Context) {
 	i, err := system.GetSystemInformation()
 	if err != nil {
-		TrackedError(err).AbortWithServerError(c)
+		NewTrackedError(err).Abort(c)
 
 		return
 	}
@@ -44,7 +45,7 @@ func postCreateServer(c *gin.Context) {
 			return
 		}
 
-		TrackedError(err).AbortWithServerError(c)
+		NewTrackedError(err).Abort(c)
 		return
 	}
 
@@ -56,14 +57,14 @@ func postCreateServer(c *gin.Context) {
 	// cycle. If there are any errors they will be logged and communicated back
 	// to the Panel where a reinstall may take place.
 	go func(i *installer.Installer) {
-		i.Execute()
+		err := i.Server().CreateEnvironment()
+		if err != nil {
+			i.Server().Log().WithField("error", err).Error("failed to create server environment during install process")
+			return
+		}
 
-		if err := i.Server().Install(); err != nil {
-			zap.S().Errorw(
-				"failed to run install process for server",
-				zap.String("server", i.Uuid()),
-				zap.Error(err),
-			)
+		if err := i.Server().Install(false); err != nil {
+			log.WithFields(log.Fields{"server": i.Uuid(), "error": err}).Error("failed to run install process for server")
 		}
 	}(install)
 
@@ -74,10 +75,23 @@ func postCreateServer(c *gin.Context) {
 func postUpdateConfiguration(c *gin.Context) {
 	// A backup of the configuration for error purposes.
 	ccopy := *config.Get()
-	// A copy of the configuration we're using to bind the data recevied into.
+	// A copy of the configuration we're using to bind the data received into.
 	cfg := *config.Get()
 
-	c.BindJSON(&cfg)
+	// BindJSON sends 400 if the request fails, all we need to do is return
+	if err := c.BindJSON(&cfg); err != nil {
+		return
+	}
+
+	// Keep the SSL certificates the same since the Panel will send through Lets Encrypt
+	// default locations. However, if we picked a different location manually we don't
+	// want to override that.
+	//
+	// If you pass through manual locations in the API call this logic will be skipped.
+	if strings.HasPrefix(cfg.Api.Ssl.KeyFile, "/etc/letsencrypt/live/") {
+		cfg.Api.Ssl.KeyFile = strings.ToLower(ccopy.Api.Ssl.KeyFile)
+		cfg.Api.Ssl.CertificateFile = strings.ToLower(ccopy.Api.Ssl.CertificateFile)
+	}
 
 	config.Set(&cfg)
 	if err := config.Get().WriteToDisk(); err != nil {
@@ -85,9 +99,9 @@ func postUpdateConfiguration(c *gin.Context) {
 		// before this code was run.
 		config.Set(&ccopy)
 
-		TrackedError(err).AbortWithServerError(c)
+		NewTrackedError(err).Abort(c)
 		return
 	}
 
 	c.Status(http.StatusNoContent)
-}
+}

router/router_transfer.go

@@ -2,29 +2,53 @@ package router
 
 import (
 	"bufio"
-	"bytes"
 	"crypto/sha256"
+	"emperror.dev/errors"
 	"encoding/hex"
-	"errors"
-	"github.com/buger/jsonparser"
+	"encoding/json"
+	"fmt"
+	"github.com/apex/log"
 	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+	"github.com/juju/ratelimit"
 	"github.com/mholt/archiver/v3"
+	"github.com/mitchellh/colorstring"
 	"github.com/pterodactyl/wings/api"
 	"github.com/pterodactyl/wings/config"
 	"github.com/pterodactyl/wings/installer"
 	"github.com/pterodactyl/wings/router/tokens"
 	"github.com/pterodactyl/wings/server"
-	"go.uber.org/zap"
+	"github.com/pterodactyl/wings/system"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
+	"sync/atomic"
 	"time"
 )
 
+// Number of ticks in the progress bar
+const ticks = 25
+
+// 100% / number of ticks = percentage represented by each tick
+const tickPercentage = 100 / ticks
+
+type downloadProgress struct {
+	size     int64
+	progress int64
+}
+
+// Data passed over to initiate a server transfer.
+type serverTransferRequest struct {
+	ServerID string          `binding:"required" json:"server_id"`
+	URL      string          `binding:"required" json:"url"`
+	Token    string          `binding:"required" json:"token"`
+	Server   json.RawMessage `json:"server"`
+}
+
+// Returns the archive for a server so that it can be transferred to a new node.
 func getServerArchive(c *gin.Context) {
 	auth := strings.SplitN(c.GetHeader("Authorization"), " ", 2)
 
@@ -38,46 +62,37 @@ func getServerArchive(c *gin.Context) {
 
 	token := tokens.TransferPayload{}
 	if err := tokens.ParseToken([]byte(auth[1]), &token); err != nil {
-		TrackedError(err).AbortWithServerError(c)
+		NewTrackedError(err).Abort(c)
 		return
 	}
 
-	if token.Subject != c.Param("server") {
+	s := ExtractServer(c)
+	if token.Subject != s.Id() {
 		c.AbortWithStatusJSON(http.StatusForbidden, gin.H{
-			"error": "( .. •˘___˘• .. )",
+			"error": "Missing required token subject, or subject is not valid for the requested server.",
 		})
 		return
 	}
 
-	s := GetServer(c.Param("server"))
-
 	st, err := s.Archiver.Stat()
 	if err != nil {
-		if !os.IsNotExist(err) {
-			TrackedServerError(err, s).SetMessage("failed to stat archive").AbortWithServerError(c)
+		if !errors.Is(err, os.ErrNotExist) {
+			WithError(c, err)
 			return
 		}
-
 		c.AbortWithStatus(http.StatusNotFound)
 		return
 	}
 
 	checksum, err := s.Archiver.Checksum()
 	if err != nil {
-		TrackedServerError(err, s).SetMessage("failed to calculate checksum").AbortWithServerError(c)
+		NewServerError(err, s).SetMessage("failed to calculate checksum").Abort(c)
 		return
 	}
 
-	file, err := os.Open(s.Archiver.ArchivePath())
+	file, err := os.Open(s.Archiver.Path())
 	if err != nil {
-		tserr := TrackedServerError(err, s)
-		if !os.IsNotExist(err) {
-			tserr.SetMessage("failed to open archive for reading")
-		} else {
-			tserr.SetMessage("failed to open archive")
-		}
-
-		tserr.AbortWithServerError(c)
+		WithError(c, err)
 		return
 	}
 	defer file.Close()
@@ -85,64 +100,28 @@ func getServerArchive(c *gin.Context) {
 	c.Header("X-Checksum", checksum)
 	c.Header("X-Mime-Type", st.Mimetype)
 	c.Header("Content-Length", strconv.Itoa(int(st.Info.Size())))
-	c.Header("Content-Disposition", "attachment; filename="+s.Archiver.ArchiveName())
+	c.Header("Content-Disposition", "attachment; filename="+s.Archiver.Name())
 	c.Header("Content-Type", "application/octet-stream")
 
 	bufio.NewReader(file).WriteTo(c.Writer)
 }
 
 func postServerArchive(c *gin.Context) {
-	s := GetServer(c.Param("server"))
+	s := ExtractServer(c)
 
-	go func(server *server.Server) {
-		start := time.Now()
+	go func(s *server.Server) {
+		r := api.New()
+		l := log.WithField("server", s.Id())
 
-		if err := server.Archiver.Archive(); err != nil {
-			zap.S().Errorw("failed to get archive for server", zap.String("server", s.Uuid), zap.Error(err))
-			return
+		// This function automatically adds the Source Node prefix and Timestamp to the log
+		// output before sending it over the websocket.
+		sendTransferLog := func(data string) {
+			output := colorstring.Color(fmt.Sprintf("[yellow][bold]%s [Pterodactyl Transfer System] [Source Node]:[default] %s", time.Now().Format(time.RFC1123), data))
+			s.Events().Publish(server.TransferLogsEvent, output)
 		}
 
-		zap.S().Debugw(
-			"successfully created archive for server",
-			zap.String("server", server.Uuid),
-			zap.Duration("time", time.Now().Sub(start).Round(time.Microsecond)),
-		)
-
-		r := api.NewRequester()
-		rerr, err := r.SendArchiveStatus(server.Uuid, true)
-		if rerr != nil || err != nil {
-			if err != nil {
-				zap.S().Errorw("failed to notify panel with archive status", zap.String("server", server.Uuid), zap.Error(err))
-				return
-			}
-
-			zap.S().Errorw(
-				"panel returned an error when sending the archive status",
-				zap.String("server", server.Uuid),
-				zap.Error(errors.New(rerr.String())),
-			)
-			return
-		}
-
-		zap.S().Debugw("successfully notified panel about archive status", zap.String("server", server.Uuid))
-	}(s)
-
-	c.Status(http.StatusAccepted)
-}
-
-func postTransfer(c *gin.Context) {
-	zap.S().Debug("incoming transfer from panel")
-
-	buf := bytes.Buffer{}
-	buf.ReadFrom(c.Request.Body)
-
-	go func(data []byte) {
-		serverID, _ := jsonparser.GetString(data, "server_id")
-		url, _ := jsonparser.GetString(data, "url")
-		token, _ := jsonparser.GetString(data, "token")
-
-		// Create an http client with no timeout.
-		client := &http.Client{Timeout: 0}
+		s.Events().Publish(server.TransferStatusEvent, "starting")
+		sendTransferLog("Attempting to archive server...")
 
 		hasError := true
 		defer func() {
@@ -150,140 +129,342 @@ func postTransfer(c *gin.Context) {
 				return
 			}
 
-			zap.S().Errorw("server transfer has failed", zap.String("server", serverID))
-			rerr, err := api.NewRequester().SendTransferFailure(serverID)
-			if rerr != nil || err != nil {
-				if err != nil {
-					zap.S().Errorw("failed to notify panel with transfer failure", zap.String("server", serverID), zap.Error(err))
+			// Mark the server as not being transferred so it can actually be used.
+			s.SetTransferring(false)
+
+			s.Events().Publish(server.TransferStatusEvent, "failure")
+
+			sendTransferLog("Attempting to notify panel of archive failure..")
+			if err := r.SendArchiveStatus(s.Id(), false); err != nil {
+				if !api.IsRequestError(err) {
+					sendTransferLog("Failed to notify panel of archive failure: " + err.Error())
+					l.WithField("error", err).Error("failed to notify panel of failed archive status")
 					return
 				}
 
-				zap.S().Errorw("panel returned an error when notifying of a transfer failure", zap.String("server", serverID), zap.Error(errors.New(rerr.String())))
+				sendTransferLog("Panel returned an error while notifying it of a failed archive: " + err.Error())
+				l.WithField("error", err.Error()).Error("panel returned an error when notifying it of a failed archive status")
 				return
 			}
 
-			zap.S().Debugw("successfully notified panel about transfer failure", zap.String("server", serverID))
+			sendTransferLog("Successfully notified panel of failed archive status")
+			l.Info("successfully notified panel of failed archive status")
 		}()
 
-		// Make a new GET request to the URL the panel gave us.
-		req, err := http.NewRequest("GET", url, nil)
-		if err != nil {
-			zap.S().Errorw("failed to create http request", zap.Error(err))
+		// Mark the server as transferring to prevent problems.
+		s.SetTransferring(true)
+
+		// Ensure the server is offline. Sometimes a "No such container" error gets through
+		// which means the server is already stopped. We can ignore that.
+		if err := s.Environment.WaitForStop(60, false); err != nil && !strings.Contains(strings.ToLower(err.Error()), "no such container") {
+			sendTransferLog("Failed to stop server, aborting transfer..")
+			l.WithField("error", err).Error("failed to stop server")
 			return
 		}
 
-		// Add the authorization header.
-		req.Header.Set("Authorization", token)
+		// Attempt to get an archive of the server.
+		if err := s.Archiver.Archive(); err != nil {
+			sendTransferLog("An error occurred while archiving the server: " + err.Error())
+			l.WithField("error", err).Error("failed to get transfer archive for server")
+			return
+		}
 
-		// Execute the http request.
-		res, err := client.Do(req)
+		sendTransferLog("Successfully created archive, attempting to notify panel..")
+		l.Info("successfully created server transfer archive, notifying panel..")
+
+		if err := r.SendArchiveStatus(s.Id(), true); err != nil {
+			if !api.IsRequestError(err) {
+				sendTransferLog("Failed to notify panel of archive success: " + err.Error())
+				l.WithField("error", err).Error("failed to notify panel of successful archive status")
+				return
+			}
+
+			sendTransferLog("Panel returned an error while notifying it of a successful archive: " + err.Error())
+			l.WithField("error", err.Error()).Error("panel returned an error when notifying it of a successful archive status")
+			return
+		}
+
+		hasError = false
+
+		// This log may not be displayed by the client due to the status event being sent before or at the same time.
+		sendTransferLog("Successfully notified panel of successful archive status")
+
+		l.Info("successfully notified panel of successful transfer archive status")
+		s.Events().Publish(server.TransferStatusEvent, "archived")
+	}(s)
+
+	c.Status(http.StatusAccepted)
+}
+
+func (w *downloadProgress) Write(v []byte) (int, error) {
+	n := len(v)
+	atomic.AddInt64(&w.progress, int64(n))
+	return n, nil
+}
+
+// Log helper function to attach all errors and info output to a consistently formatted
+// log string for easier querying.
+func (str serverTransferRequest) log() *log.Entry {
+	return log.WithField("subsystem", "transfers").WithField("server_id", str.ServerID)
+}
+
+// Downloads an archive from the machine that the server currently lives on.
+func (str serverTransferRequest) downloadArchive() (*http.Response, error) {
+	client := http.Client{Timeout: 0}
+	req, err := http.NewRequest(http.MethodGet, str.URL, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Authorization", str.Token)
+	res, err := client.Do(req) // lgtm [go/request-forgery]
+	if err != nil {
+		return nil, err
+	}
+	return res, nil
+}
+
+// Returns the path to the local archive on the system.
+func (str serverTransferRequest) path() string {
+	return filepath.Join(config.Get().System.ArchiveDirectory, str.ServerID+".tar.gz")
+}
+
+// Creates the archive location on this machine by first checking that the required file
+// does not already exist. If it does exist, the file is deleted and then re-created as
+// an empty file.
+func (str serverTransferRequest) createArchiveFile() (*os.File, error) {
+	p := str.path()
+	if _, err := os.Stat(p); err != nil {
+		if !os.IsNotExist(err) {
+			return nil, err
+		}
+	} else if err := os.Remove(p); err != nil {
+		return nil, err
+	}
+	return os.Create(p)
+}
+
+// Deletes the archive from the local filesystem. This is executed as a deferred function.
+func (str serverTransferRequest) removeArchivePath() {
+	p := str.path()
+	str.log().Debug("deleting temporary transfer archive")
+	if err := os.Remove(p); err != nil && !os.IsNotExist(err) {
+		str.log().WithField("path", p).WithField("error", err).Error("failed to delete temporary transfer archive file")
+		return
+	}
+	str.log().Debug("deleted temporary transfer archive successfully")
+}
+
+// Verifies that the SHA-256 checksum of the file on the local filesystem matches the
+// expected value from the transfer request. The string value returned is the computed
+// checksum on the system.
+func (str serverTransferRequest) verifyChecksum(matches string) (bool, string, error) {
+	file, err := os.Open(str.path())
+	if err != nil {
+		return false, "", err
+	}
+	defer file.Close()
+	hash := sha256.New()
+	buf := make([]byte, 1024*4)
+	if _, err := io.CopyBuffer(hash, file, buf); err != nil {
+		return false, "", err
+	}
+	checksum := hex.EncodeToString(hash.Sum(nil))
+	return checksum == matches, checksum, nil
+}
+
+// Sends a notification to the Panel letting it know what the status of this transfer is.
+func (str serverTransferRequest) sendTransferStatus(successful bool) error {
+	lg := str.log().WithField("transfer_successful", successful)
+	lg.Info("notifying Panel of server transfer state")
+	if err := api.New().SendTransferStatus(str.ServerID, successful); err != nil {
+		lg.WithField("error", err).Error("error notifying panel of transfer state")
+		return err
+	}
+	lg.Debug("notified panel of transfer state")
+	return nil
+}
+
+// Initiates a transfer between two nodes for a server by downloading an archive from the
+// remote node and then applying the server details to this machine.
+func postTransfer(c *gin.Context) {
+	var data serverTransferRequest
+	if err := c.BindJSON(&data); err != nil {
+		return
+	}
+
+	u, err := uuid.Parse(data.ServerID)
+	if err != nil {
+		WithError(c, err)
+		return
+	}
+	// Force the server ID to be a valid UUID string at this point. If it is not an error
+	// is returned to the caller. This limits injection vulnerabilities that would cause
+	// the str.path() function to return a location not within the server archive directory.
+	data.ServerID = u.String()
+
+	data.log().Info("handling incoming server transfer request")
+	go func(data *serverTransferRequest) {
+		hasError := true
+
+		// Create a new server installer. This will only configure the environment and not
+		// run the installer scripts.
+		i, err := installer.New(data.Server)
 		if err != nil {
-			zap.S().Errorw("failed to send http request", zap.Error(err))
+			_ = data.sendTransferStatus(false)
+			data.log().WithField("error", err).Error("failed to validate received server data")
+			return
+		}
+
+		// This function automatically adds the Target Node prefix and Timestamp to the log output before sending it
+		// over the websocket.
+		sendTransferLog := func(data string) {
+			output := colorstring.Color(fmt.Sprintf("[yellow][bold]%s [Pterodactyl Transfer System] [Target Node]:[default] %s", time.Now().Format(time.RFC1123), data))
+			i.Server().Events().Publish(server.TransferLogsEvent, output)
+		}
+
+		// Mark the server as transferring to prevent problems later on during the process and
+		// then push the server into the global server collection for this instance.
+		i.Server().SetTransferring(true)
+		server.GetServers().Add(i.Server())
+		defer func(s *server.Server) {
+			// In the event that this transfer call fails, remove the server from the global
+			// server tracking so that we don't have a dangling instance.
+			if err := data.sendTransferStatus(!hasError); hasError || err != nil {
+				sendTransferLog("Server transfer failed, check Wings logs for additional information.")
+				s.Events().Publish(server.TransferStatusEvent, "failure")
+				server.GetServers().Remove(func(s2 *server.Server) bool {
+					return s.Id() == s2.Id()
+				})
+
+				// If the transfer status was successful but the request failed, act like the transfer failed.
+				if !hasError && err != nil {
+					// Delete all extracted files.
+					if err := os.RemoveAll(s.Filesystem().Path()); err != nil && !os.IsNotExist(err) {
+						data.log().WithField("error", err).Warn("failed to delete local server files directory")
+					}
+				}
+			} else {
+				s.SetTransferring(false)
+				s.Events().Publish(server.TransferStatusEvent, "success")
+				sendTransferLog("Transfer completed.")
+			}
+		}(i.Server())
+
+		data.log().Info("downloading server archive from current server node")
+		sendTransferLog("Received incoming transfer from Panel, attempting to download archive from source node...")
+		res, err := data.downloadArchive()
+		if err != nil {
+			sendTransferLog("Failed to retrieve server archive from remote node: " + err.Error())
+			data.log().WithField("error", err).Error("failed to download archive for server transfer")
 			return
 		}
 		defer res.Body.Close()
-
-		// Handle non-200 status codes.
 		if res.StatusCode != 200 {
-			body, err := ioutil.ReadAll(res.Body)
-			if err != nil {
-				zap.S().Errorw("failed to read response body", zap.Int("status", res.StatusCode), zap.Error(err))
-				return
-			}
-
-			zap.S().Errorw("failed to request server archive", zap.Int("status", res.StatusCode), zap.String("body", string(body)))
+			data.log().WithField("error", err).WithField("status", res.StatusCode).Error("unexpected error response from transfer endpoint")
 			return
 		}
 
-		// Get the path to the archive.
-		archivePath := filepath.Join(config.Get().System.ArchiveDirectory, serverID + ".tar.gz")
-
-		// Check if the archive already exists and delete it if it does.
-		_, err = os.Stat(archivePath)
-		if err != nil {
-			if !os.IsNotExist(err) {
-				zap.S().Errorw("failed to stat file", zap.Error(err))
-				return
-			}
-		} else {
-			if err := os.Remove(archivePath); err != nil {
-				zap.S().Errorw("failed to delete old file", zap.Error(err))
-				return
-			}
-		}
-
-		// Create the file.
-		file, err := os.Create(archivePath)
-		if err != nil {
-			zap.S().Errorw("failed to open file on disk", zap.Error(err))
+		size := res.ContentLength
+		if size == 0 {
+			data.log().WithField("error", err).Error("received an archive response with Content-Length of 0")
 			return
 		}
+		sendTransferLog("Got server archive response from remote node. (Content-Length: " + strconv.Itoa(int(size)) + ")")
+		sendTransferLog("Creating local archive file...")
+		file, err := data.createArchiveFile()
+		if err != nil {
+			data.log().WithField("error", err).Error("failed to create archive file on local filesystem")
+			return
+		}
+
+		sendTransferLog("Writing archive to disk...")
+		data.log().Info("writing transfer archive to disk...")
 
 		// Copy the file.
-		_, err = io.Copy(file, res.Body)
-		if err != nil {
-			zap.S().Errorw("failed to copy file to disk", zap.Error(err))
-			return
+		progress := &downloadProgress{size: size}
+		ticker := time.NewTicker(3 * time.Second)
+		go func(progress *downloadProgress, t *time.Ticker) {
+			for range ticker.C {
+				// p = 100 (Downloaded)
+				// size = 1000 (Content-Length)
+				// p / size = 0.1
+				// * 100 = 10% (Multiply by 100 to get a percentage of the download)
+				// 10% / tickPercentage = (10% / (100 / 25)) (Divide by tick percentage to get the number of ticks)
+				// 2.5 (Number of ticks as a float64)
+				// 2 (convert to an integer)
+				p := atomic.LoadInt64(&progress.progress)
+				// We have to cast these numbers to float in order to get a float result from the division.
+				width := ((float64(p) / float64(size)) * 100) / tickPercentage
+				bar := strings.Repeat("=", int(width)) + strings.Repeat(" ", ticks-int(width))
+				sendTransferLog("Downloading [" + bar + "] " + system.FormatBytes(p) + " / " + system.FormatBytes(progress.size))
+			}
+		}(progress, ticker)
+
+		var reader io.Reader
+		downloadLimit := float64(config.Get().System.Transfers.DownloadLimit) * 1024 * 1024
+		if downloadLimit > 0 {
+			// Wrap the body with a reader that is limited to the defined download limit speed.
+			reader = ratelimit.Reader(res.Body, ratelimit.NewBucketWithRate(downloadLimit, int64(downloadLimit)))
+		} else {
+			reader = res.Body
 		}
 
-		// Close the file so it can be opened to verify the checksum.
+		buf := make([]byte, 1024*4)
+		if _, err := io.CopyBuffer(file, io.TeeReader(reader, progress), buf); err != nil {
+			ticker.Stop()
+			_ = file.Close()
+
+			sendTransferLog("Failed while writing archive file to disk: " + err.Error())
+			data.log().WithField("error", err).Error("failed to copy archive file to disk")
+			return
+		}
+		ticker.Stop()
+
+		// Show 100% completion.
+		humanSize := system.FormatBytes(progress.size)
+		sendTransferLog("Downloading [" + strings.Repeat("=", ticks) + "] " + humanSize + " / " + humanSize)
+
 		if err := file.Close(); err != nil {
-			zap.S().Errorw("failed to close archive file", zap.Error(err))
+			data.log().WithField("error", err).Error("unable to close archive file on local filesystem")
 			return
 		}
-		zap.S().Debug("server archive has been downloaded, computing checksum..", zap.String("server", serverID))
+		data.log().Info("finished writing transfer archive to disk")
+		sendTransferLog("Successfully wrote archive to disk.")
 
-		// Open the archive file for computing a checksum.
-		file, err = os.Open(archivePath)
-		if err != nil {
-			zap.S().Errorw("failed to open file on disk", zap.Error(err))
+		// Whenever the transfer fails or succeeds, delete the temporary transfer archive that
+		// was created on the disk.
+		defer data.removeArchivePath()
+
+		sendTransferLog("Verifying checksum of downloaded archive...")
+		data.log().Info("computing checksum of downloaded archive file")
+		expected := res.Header.Get("X-Checksum")
+		if matches, computed, err := data.verifyChecksum(expected); err != nil {
+			data.log().WithField("error", err).Error("encountered an error while calculating local filesystem archive checksum")
+			return
+		} else if !matches {
+			sendTransferLog("@@@@@ CHECKSUM VERIFICATION FAILED @@@@@")
+			sendTransferLog("  -   Source Checksum: " + expected)
+			sendTransferLog("  - Computed Checksum: " + computed)
+			data.log().WithField("expected_sum", expected).WithField("computed_checksum", computed).Error("checksum mismatch when verifying integrity of local archive")
 			return
 		}
 
-		// Compute the sha256 checksum of the file.
-		hash := sha256.New()
-		if _, err := io.Copy(hash, file); err != nil {
-			zap.S().Errorw("failed to copy file for checksum verification", zap.Error(err))
+		// Create the server's environment.
+		sendTransferLog("Creating server environment, this could take a while..")
+		data.log().Info("creating server environment")
+		if err := i.Server().CreateEnvironment(); err != nil {
+			data.log().WithField("error", err).Error("failed to create server environment")
 			return
 		}
 
-		// Verify the two checksums.
-		if hex.EncodeToString(hash.Sum(nil)) != res.Header.Get("X-Checksum") {
-			zap.S().Errorw("checksum failed verification")
-			return
-		}
-
-		// Close the file.
-		if err := file.Close(); err != nil {
-			zap.S().Errorw("failed to close archive file", zap.Error(err))
-			return
-		}
-
-		zap.S().Infow("server archive transfer was successful", zap.String("server", serverID))
-
-		// Get the server data from the request.
-		serverData, t, _, _ := jsonparser.Get(data, "server")
-		if t != jsonparser.Object {
-			zap.S().Errorw("invalid server data passed in request")
-			return
-		}
-
-		// Create a new server installer (note this does not execute the install script)
-		i, err := installer.New(serverData)
-		if err != nil {
-			zap.S().Warnw("failed to validate the received server data", zap.Error(err))
-			return
-		}
-
-		// Add the server to the collection.
-		server.GetServers().Add(i.Server())
-
-		// Create the server's environment (note this does not execute the install script)
-		i.Execute()
-
-		// Un-archive the archive. That sounds weird..
-		if err := archiver.NewTarGz().Unarchive(archivePath, i.Server().Filesystem.Path()); err != nil {
-			zap.S().Errorw("failed to extract archive", zap.String("server", serverID), zap.Error(err))
+		sendTransferLog("Server environment has been created, extracting transfer archive..")
+		data.log().Info("server environment configured, extracting transfer archive")
+		if err := archiver.NewTarGz().Unarchive(data.path(), i.Server().Filesystem().Path()); err != nil {
+			// Un-archiving failed, delete the server's data directory.
+			if err := os.RemoveAll(i.Server().Filesystem().Path()); err != nil && !os.IsNotExist(err) {
+				data.log().WithField("error", err).Warn("failed to delete local server files directory")
+			}
+			data.log().WithField("error", err).Error("failed to extract server archive")
 			return
 		}
 
@@ -294,20 +475,9 @@ func postTransfer(c *gin.Context) {
 		// hiccup or the fix of whatever error causing the success request to fail.
 		hasError = false
 
-		// Notify the panel that the transfer succeeded.
-		rerr, err := api.NewRequester().SendTransferSuccess(serverID)
-		if rerr != nil || err != nil {
-			if err != nil {
-				zap.S().Errorw("failed to notify panel with transfer success", zap.String("server", serverID), zap.Error(err))
-				return
-			}
-
-			zap.S().Errorw("panel returned an error when notifying of a transfer success", zap.String("server", serverID), zap.Error(errors.New(rerr.String())))
-			return
-		}
-
-		zap.S().Debugw("successfully notified panel about transfer success", zap.String("server", serverID))
-	}(buf.Bytes())
+		data.log().Info("archive extracted successfully, notifying Panel of status")
+		sendTransferLog("Archive extracted successfully.")
+	}(&data)
 
 	c.Status(http.StatusAccepted)
 }

router/tokens/backup.go

@@ -6,6 +6,7 @@ import (
 
 type BackupPayload struct {
 	jwt.Payload
+
 	ServerUuid string `json:"server_uuid"`
 	BackupUuid string `json:"backup_uuid"`
 	UniqueId   string `json:"unique_id"`
@@ -22,4 +23,4 @@ func (p *BackupPayload) GetPayload() *jwt.Payload {
 // validates all of the request.
 func (p *BackupPayload) IsUniqueRequest() bool {
 	return getTokenStore().IsValidToken(p.UniqueId)
-}
+}

router/tokens/upload.go

@@ -0,0 +1,25 @@
+package tokens
+
+import (
+	"github.com/gbrlsnchs/jwt/v3"
+)
+
+type UploadPayload struct {
+	jwt.Payload
+
+	ServerUuid string `json:"server_uuid"`
+	UniqueId   string `json:"unique_id"`
+}
+
+// Returns the JWT payload.
+func (p *UploadPayload) GetPayload() *jwt.Payload {
+	return &p.Payload
+}
+
+// Determines if this JWT is valid for the given request cycle. If the
+// unique ID passed in the token has already been seen before this will
+// return false. This allows us to use this JWT as a one-time token that
+// validates all of the request.
+func (p *UploadPayload) IsUniqueRequest() bool {
+	return getTokenStore().IsValidToken(p.UniqueId)
+}

router/tokens/websocket.go

@@ -2,12 +2,44 @@ package tokens
 
 import (
 	"encoding/json"
+	"github.com/apex/log"
 	"github.com/gbrlsnchs/jwt/v3"
 	"strings"
+	"sync"
+	"time"
 )
 
+// The time at which Wings was booted. No JWT's created before this time are allowed to
+// connect to the socket since they may have been marked as denied already and therefore
+// could be invalid at this point.
+//
+// By doing this we make it so that a user who gets disconnected from Wings due to a Wings
+// reboot just needs to request a new token as if their old token had expired naturally.
+var wingsBootTime = time.Now()
+
+// A map that contains any JTI's that have been denied by the Panel and the time at which
+// they were marked as denied. Therefore any JWT with the same JTI and an IssuedTime that
+// is the same as or before this time should be considered invalid.
+//
+// This is used to allow the Panel to revoke tokens en-masse for a given user & server
+// combination since the JTI for tokens is just MD5(user.id + server.uuid). When a server
+// is booted this listing is fetched from the panel and the Websocket is dynamically updated.
+var denylist sync.Map
+
+// Adds a JTI to the denylist by marking any JWTs generated before the current time as
+// being invalid if they use the same JTI.
+func DenyJTI(jti string) {
+	log.WithField("jti", jti).Debugf("adding \"%s\" to JTI denylist", jti)
+
+	denylist.Store(jti, time.Now())
+}
+
+// A JWT payload for Websocket connections. This JWT is passed along to the Websocket after
+// it has been connected to by sending an "auth" event.
 type WebsocketPayload struct {
 	jwt.Payload
+	sync.RWMutex
+
 	UserID      json.Number `json:"user_id"`
 	ServerUUID  string      `json:"server_uuid"`
 	Permissions []string    `json:"permissions"`
@@ -15,16 +47,57 @@ type WebsocketPayload struct {
 
 // Returns the JWT payload.
 func (p *WebsocketPayload) GetPayload() *jwt.Payload {
+	p.RLock()
+	defer p.RUnlock()
+
 	return &p.Payload
 }
 
-// Checks if the given token payload has a permission string.
-func (p *WebsocketPayload) HasPermission(permission string) bool {
-	for _, k := range p.Permissions {
-		if k == permission || (!strings.HasPrefix(permission, "admin") && k == "*") {
+// Returns the UUID of the server associated with this JWT.
+func (p *WebsocketPayload) GetServerUuid() string {
+	p.RLock()
+	defer p.RUnlock()
+
+	return p.ServerUUID
+}
+
+// Check if the JWT has been marked as denied by the instance due to either being issued
+// before Wings was booted, or because we have denied all tokens with the same JTI
+// occurring before a set time.
+func (p *WebsocketPayload) Denylisted() bool {
+	// If there is no IssuedAt present for the token, we cannot validate the token so
+	// just immediately mark it as not valid.
+	if p.IssuedAt == nil {
+		return true
+	}
+
+	// If the time that the token was issued is before the time at which Wings was booted
+	// then the token is invalid for our purposes, even if the token "has permission".
+	if p.IssuedAt.Time.Before(wingsBootTime) {
+		return true
+	}
+
+	// Finally, if the token was issued before a time that is currently denied for this
+	// token instance, ignore the permissions response.
+	if t, ok := denylist.Load(p.JWTID); ok {
+		if p.IssuedAt.Time.Before(t.(time.Time)) {
 			return true
 		}
 	}
 
 	return false
 }
+
+// Checks if the given token payload has a permission string.
+func (p *WebsocketPayload) HasPermission(permission string) bool {
+	p.RLock()
+	defer p.RUnlock()
+
+	for _, k := range p.Permissions {
+		if k == permission || (!strings.HasPrefix(permission, "admin") && k == "*") {
+			return !p.Denylisted()
+		}
+	}
+
+	return false
+}

router/websocket/listeners.go

@@ -2,6 +2,7 @@ package websocket
 
 import (
 	"context"
+	"github.com/pterodactyl/wings/events"
 	"github.com/pterodactyl/wings/server"
 	"time"
 )
@@ -26,46 +27,51 @@ func (h *Handler) ListenForExpiration(ctx context.Context) {
 			jwt := h.GetJwt()
 			if jwt != nil {
 				if jwt.ExpirationTime.Unix()-time.Now().Unix() <= 0 {
-					h.SendJson(&Message{Event: TokenExpiredEvent})
-				} else if jwt.ExpirationTime.Unix()-time.Now().Unix() <= 180 {
-					h.SendJson(&Message{Event: TokenExpiringEvent})
+					_ = h.SendJson(&Message{Event: TokenExpiredEvent})
+				} else if jwt.ExpirationTime.Unix()-time.Now().Unix() <= 60 {
+					_ = h.SendJson(&Message{Event: TokenExpiringEvent})
 				}
 			}
 		}
 	}
 }
 
+var e = []string{
+	server.StatsEvent,
+	server.StatusEvent,
+	server.ConsoleOutputEvent,
+	server.InstallOutputEvent,
+	server.InstallStartedEvent,
+	server.InstallCompletedEvent,
+	server.DaemonMessageEvent,
+	server.BackupCompletedEvent,
+	server.TransferLogsEvent,
+	server.TransferStatusEvent,
+}
+
 // Listens for different events happening on a server and sends them along
 // to the connected websocket.
 func (h *Handler) ListenForServerEvents(ctx context.Context) {
-	events := []string{
-		server.StatsEvent,
-		server.StatusEvent,
-		server.ConsoleOutputEvent,
-		server.InstallOutputEvent,
-		server.DaemonMessageEvent,
-		server.BackupCompletedEvent,
-	}
-
-	eventChannel := make(chan server.Event)
-	for _, event := range events {
-		h.server.Events().Subscribe(event, eventChannel)
-	}
-
-	select {
-	case <-ctx.Done():
-		for _, event := range events {
-			h.server.Events().Unsubscribe(event, eventChannel)
-		}
-
-		close(eventChannel)
-	default:
-		// Listen for different events emitted by the server and respond to them appropriately.
-		for d := range eventChannel {
-			h.SendJson(&Message{
-				Event: d.Topic,
-				Args:  []string{d.Data},
-			})
+	h.server.Log().Debug("listening for server events over websocket")
+	callback := func(e events.Event) {
+		if err := h.SendJson(&Message{Event: e.Topic, Args: []string{e.Data}}); err != nil {
+			h.server.Log().WithField("error", err).Warn("error while sending server data over websocket")
 		}
 	}
+
+	// Subscribe to all of the events with the same callback that will push the data out over the
+	// websocket for the server.
+	for _, evt := range e {
+		h.server.Events().On(evt, &callback)
+	}
+
+	go func(ctx context.Context) {
+		select {
+		case <-ctx.Done():
+			// Once this context is stopped, de-register all of the listeners that have been registered.
+			for _, evt := range e {
+				h.server.Events().Off(evt, &callback)
+			}
+		}
+	}(ctx)
 }

router/websocket/message.go

@@ -8,16 +8,13 @@ const (
 	SetStateEvent              = "set state"
 	SendServerLogsEvent        = "send logs"
 	SendCommandEvent           = "send command"
+	SendStatsEvent             = "send stats"
 	ErrorEvent                 = "daemon error"
+	JwtErrorEvent              = "jwt error"
 )
 
 type Message struct {
-	// The event to perform. Should be one of the following that are supported:
-	//
-	// - status : Returns the server's power state.
-	// - logs : Returns the server log data at the time of the request.
-	// - power : Performs a power action aganist the server based the data.
-	// - command : Performs a command on a server using the data field.
+	// The event to perform.
 	Event string `json:"event"`
 
 	// The data to pass along, only used by power/command currently. Other requests

router/websocket/websocket.go

@@ -1,17 +1,20 @@
 package websocket
 
 import (
+	"context"
+	"emperror.dev/errors"
+	"encoding/json"
 	"fmt"
+	"github.com/apex/log"
 	"github.com/gbrlsnchs/jwt/v3"
 	"github.com/google/uuid"
 	"github.com/gorilla/websocket"
-	"github.com/pkg/errors"
 	"github.com/pterodactyl/wings/config"
+	"github.com/pterodactyl/wings/environment"
+	"github.com/pterodactyl/wings/environment/docker"
 	"github.com/pterodactyl/wings/router/tokens"
 	"github.com/pterodactyl/wings/server"
-	"go.uber.org/zap"
 	"net/http"
-	"os"
 	"strings"
 	"sync"
 	"time"
@@ -25,14 +28,31 @@ const (
 	PermissionSendPowerRestart = "control.restart"
 	PermissionReceiveErrors    = "admin.websocket.errors"
 	PermissionReceiveInstall   = "admin.websocket.install"
+	PermissionReceiveTransfer  = "admin.websocket.transfer"
 	PermissionReceiveBackups   = "backup.read"
 )
 
 type Handler struct {
-	sync.RWMutex
-	Connection *websocket.Conn
-	jwt        *tokens.WebsocketPayload `json:"-"`
-	server     *server.Server
+	sync.RWMutex `json:"-"`
+	Connection   *websocket.Conn `json:"-"`
+	jwt          *tokens.WebsocketPayload
+	server       *server.Server
+	uuid         uuid.UUID
+}
+
+var (
+	ErrJwtNotPresent    = errors.New("jwt: no jwt present")
+	ErrJwtNoConnectPerm = errors.New("jwt: missing connect permission")
+	ErrJwtUuidMismatch  = errors.New("jwt: server uuid mismatch")
+	ErrJwtOnDenylist    = errors.New("jwt: created too far in past (denylist)")
+)
+
+func IsJwtError(err error) bool {
+	return errors.Is(err, ErrJwtNotPresent) ||
+		errors.Is(err, ErrJwtNoConnectPerm) ||
+		errors.Is(err, ErrJwtUuidMismatch) ||
+		errors.Is(err, ErrJwtOnDenylist) ||
+		errors.Is(err, jwt.ErrExpValidation)
 }
 
 // Parses a JWT into a websocket token payload.
@@ -43,8 +63,12 @@ func NewTokenPayload(token []byte) (*tokens.WebsocketPayload, error) {
 		return nil, err
 	}
 
+	if payload.Denylisted() {
+		return nil, ErrJwtOnDenylist
+	}
+
 	if !payload.HasPermission(PermissionConnect) {
-		return nil, errors.New("not authorized to connect to this socket")
+		return nil, ErrJwtNoConnectPerm
 	}
 
 	return &payload, nil
@@ -56,7 +80,16 @@ func GetHandler(s *server.Server, w http.ResponseWriter, r *http.Request) (*Hand
 		// Ensure that the websocket request is originating from the Panel itself,
 		// and not some other location.
 		CheckOrigin: func(r *http.Request) bool {
-			return r.Header.Get("Origin") == config.Get().PanelLocation
+			o := r.Header.Get("Origin")
+			if o == config.Get().PanelLocation {
+				return true
+			}
+			for _, origin := range config.Get().AllowedOrigins {
+				if origin == "*" || origin == o {
+					return true
+				}
+			}
+			return false
 		},
 	}
 
@@ -65,17 +98,30 @@ func GetHandler(s *server.Server, w http.ResponseWriter, r *http.Request) (*Hand
 		return nil, err
 	}
 
+	u, err := uuid.NewRandom()
+	if err != nil {
+		return nil, err
+	}
+
 	return &Handler{
 		Connection: conn,
 		jwt:        nil,
 		server:     s,
+		uuid:       u,
 	}, nil
 }
 
+func (h *Handler) Uuid() uuid.UUID {
+	return h.uuid
+}
+
 func (h *Handler) SendJson(v *Message) error {
-	// Do not send JSON down the line if the JWT on the connection is not
-	// valid!
+	// Do not send JSON down the line if the JWT on the connection is not valid!
 	if err := h.TokenValid(); err != nil {
+		h.unsafeSendJson(Message{
+			Event: JwtErrorEvent,
+			Args:  []string{err.Error()},
+		})
 		return nil
 	}
 
@@ -84,7 +130,6 @@ func (h *Handler) SendJson(v *Message) error {
 		// If we're sending installation output but the user does not have the required
 		// permissions to see the output, don't send it down the line.
 		if v.Event == server.InstallOutputEvent {
-			zap.S().Debugf("%+v", v.Args)
 			if !j.HasPermission(PermissionReceiveInstall) {
 				return nil
 			}
@@ -97,9 +142,32 @@ func (h *Handler) SendJson(v *Message) error {
 				return nil
 			}
 		}
+
+		// If we are sending transfer output, only send it to the user if they have the required permissions.
+		if v.Event == server.TransferLogsEvent {
+			if !j.HasPermission(PermissionReceiveTransfer) {
+				return nil
+			}
+		}
 	}
 
-	return h.unsafeSendJson(v)
+	if err := h.unsafeSendJson(v); err != nil {
+		// Not entirely sure how this happens (likely just when there is a ton of console spam)
+		// but I don't care to fix it right now, so just mask the error and throw a warning into
+		// the logs for us to look into later.
+		if errors.Is(err, websocket.ErrCloseSent) {
+			if h.server != nil {
+				h.server.Log().WithField("subsystem", "websocket").
+					WithField("event", v.Event).
+					Warn("failed to send event to websocket: close already sent")
+			}
+			return nil
+		}
+
+		return err
+	}
+
+	return nil
 }
 
 // Sends JSON over the websocket connection, ignoring the authentication state of the
@@ -116,19 +184,23 @@ func (h *Handler) unsafeSendJson(v interface{}) error {
 func (h *Handler) TokenValid() error {
 	j := h.GetJwt()
 	if j == nil {
-		return errors.New("no jwt present")
+		return ErrJwtNotPresent
 	}
 
 	if err := jwt.ExpirationTimeValidator(time.Now())(&j.Payload); err != nil {
 		return err
 	}
 
-	if !j.HasPermission(PermissionConnect) {
-		return errors.New("jwt does not have connect permission")
+	if j.Denylisted() {
+		return ErrJwtOnDenylist
 	}
 
-	if h.server.Uuid != j.ServerUUID {
-		return errors.New("jwt server uuid mismatch")
+	if !j.HasPermission(PermissionConnect) {
+		return ErrJwtNoConnectPerm
+	}
+
+	if h.server.Id() != j.GetServerUuid() {
+		return ErrJwtUuidMismatch
 	}
 
 	return nil
@@ -137,32 +209,31 @@ func (h *Handler) TokenValid() error {
 // Sends an error back to the connected websocket instance by checking the permissions
 // of the token. If the user has the "receive-errors" grant we will send back the actual
 // error message, otherwise we just send back a standard error message.
-func (h *Handler) SendErrorJson(err error) error {
-	h.Lock()
-	defer h.Unlock()
-
+func (h *Handler) SendErrorJson(msg Message, err error, shouldLog ...bool) error {
 	j := h.GetJwt()
+	isJWTError := IsJwtError(err)
 
-	message := "an unexpected error was encountered while handling this request"
-	if server.IsSuspendedError(err) || (j != nil && j.HasPermission(PermissionReceiveErrors)) {
-		message = err.Error()
+	wsm := Message{
+		Event: ErrorEvent,
+		Args:  []string{"an unexpected error was encountered while handling this request"},
 	}
 
-	m, u := h.GetErrorMessage(message)
+	if isJWTError || (j != nil && j.HasPermission(PermissionReceiveErrors)) {
+		if isJWTError {
+			wsm.Event = JwtErrorEvent
+		}
+		wsm.Args = []string{err.Error()}
+	}
 
-	wsm := Message{Event: ErrorEvent}
+	m, u := h.GetErrorMessage(wsm.Args[0])
 	wsm.Args = []string{m}
 
-	if !server.IsSuspendedError(err) {
-		zap.S().Errorw(
-			"an error was encountered in the websocket process",
-			zap.String("server", h.server.Uuid),
-			zap.String("error_identifier", u.String()),
-			zap.Error(err),
-		)
+	if !isJWTError && (len(shouldLog) == 0 || (len(shouldLog) == 1 && shouldLog[0] == true)) {
+		h.server.Log().WithFields(log.Fields{"event": msg.Event, "error_identifier": u.String(), "error": err}).
+			Errorf("error processing websocket event \"%s\"", msg.Event)
 	}
 
-	return h.Connection.WriteJSON(wsm)
+	return h.unsafeSendJson(wsm)
 }
 
 // Converts an error message into a more readable representation and returns a UUID
@@ -193,13 +264,10 @@ func (h *Handler) GetJwt() *tokens.WebsocketPayload {
 func (h *Handler) HandleInbound(m Message) error {
 	if m.Event != AuthenticationEvent {
 		if err := h.TokenValid(); err != nil {
-			zap.S().Debugw("jwt token is no longer valid", zap.String("message", err.Error()))
-
 			h.unsafeSendJson(Message{
-				Event: ErrorEvent,
-				Args:  []string{"could not authenticate client: " + err.Error()},
+				Event: JwtErrorEvent,
+				Args:  []string{err.Error()},
 			})
-
 			return nil
 		}
 	}
@@ -219,51 +287,82 @@ func (h *Handler) HandleInbound(m Message) error {
 				return err
 			}
 
-			if token.HasPermission(PermissionConnect) {
-				h.setJwt(token)
-			}
+			// Check if the user has previously authenticated successfully.
+			newConnection := h.GetJwt() == nil
 
-			// On every authentication event, send the current server status back
-			// to the client. :)
-			h.server.Events().Publish(server.StatusEvent, h.server.GetState())
+			// Previously there was a HasPermission(PermissionConnect) check around this,
+			// however NewTokenPayload will return an error if it doesn't have the connect
+			// permission meaning that it was a redundant function call.
+			h.setJwt(token)
 
+			// Tell the client they authenticated successfully.
 			h.unsafeSendJson(Message{
 				Event: AuthenticationSuccessEvent,
 				Args:  []string{},
 			})
 
+			// Check if the client was refreshing their authentication token
+			// instead of authenticating for the first time.
+			if !newConnection {
+				// This prevents duplicate status messages as outlined in
+				// https://github.com/pterodactyl/panel/issues/2077
+				return nil
+			}
+
+			// On every authentication event, send the current server status back
+			// to the client. :)
+			state := h.server.Environment.State()
+			h.SendJson(&Message{
+				Event: server.StatusEvent,
+				Args:  []string{state},
+			})
+
+			// Only send the current disk usage if the server is offline, if docker container is running,
+			// Environment#EnableResourcePolling() will send this data to all clients.
+			if state == environment.ProcessOfflineState {
+				if !h.server.IsInstalling() && !h.server.IsTransferring() {
+					_ = h.server.Filesystem().HasSpaceAvailable(false)
+
+					b, _ := json.Marshal(h.server.Proc())
+					h.SendJson(&Message{
+						Event: server.StatsEvent,
+						Args:  []string{string(b)},
+					})
+				}
+			}
+
 			return nil
 		}
 	case SetStateEvent:
 		{
-			switch strings.Join(m.Args, "") {
-			case "start":
-				if h.GetJwt().HasPermission(PermissionSendPowerStart) {
-					return h.server.Environment.Start()
-				}
-				break
-			case "stop":
-				if h.GetJwt().HasPermission(PermissionSendPowerStop) {
-					return h.server.Environment.Stop()
-				}
-				break
-			case "restart":
-				if h.GetJwt().HasPermission(PermissionSendPowerRestart) {
-					if err := h.server.Environment.WaitForStop(60, false); err != nil {
-						return err
-					}
+			action := server.PowerAction(strings.Join(m.Args, ""))
 
-					return h.server.Environment.Start()
+			actions := make(map[server.PowerAction]string)
+			actions[server.PowerActionStart] = PermissionSendPowerStart
+			actions[server.PowerActionStop] = PermissionSendPowerStop
+			actions[server.PowerActionRestart] = PermissionSendPowerRestart
+			actions[server.PowerActionTerminate] = PermissionSendPowerStop
+
+			// Check that they have permission to perform this action if it is needed.
+			if permission, exists := actions[action]; exists {
+				if !h.GetJwt().HasPermission(permission) {
+					return nil
 				}
-				break
-			case "kill":
-				if h.GetJwt().HasPermission(PermissionSendPowerStop) {
-					return h.server.Environment.Terminate(os.Kill)
-				}
-				break
 			}
 
-			return nil
+			err := h.server.HandlePowerAction(action)
+			if errors.Is(err, context.DeadlineExceeded) {
+				m, _ := h.GetErrorMessage("another power action is currently being processed for this server, please try again later")
+
+				h.SendJson(&Message{
+					Event: ErrorEvent,
+					Args:  []string{m},
+				})
+
+				return nil
+			}
+
+			return err
 		}
 	case SendServerLogsEvent:
 		{
@@ -271,7 +370,7 @@ func (h *Handler) HandleInbound(m Message) error {
 				return nil
 			}
 
-			logs, err := h.server.Environment.Readlog(1024 * 16)
+			logs, err := h.server.Environment.Readlog(config.Get().System.WebsocketLogCount)
 			if err != nil {
 				return err
 			}
@@ -283,6 +382,16 @@ func (h *Handler) HandleInbound(m Message) error {
 				})
 			}
 
+			return nil
+		}
+	case SendStatsEvent:
+		{
+			b, _ := json.Marshal(h.server.Proc())
+			h.SendJson(&Message{
+				Event: server.StatsEvent,
+				Args:  []string{string(b)},
+			})
+
 			return nil
 		}
 	case SendCommandEvent:
@@ -291,10 +400,22 @@ func (h *Handler) HandleInbound(m Message) error {
 				return nil
 			}
 
-			if h.server.GetState() == server.ProcessOfflineState {
+			if h.server.Environment.State() == environment.ProcessOfflineState {
 				return nil
 			}
 
+			// TODO(dane): should probably add a new process state that is "booting environment" or something
+			//  so that we can better handle this and only set the environment to booted once we're attached.
+			//
+			//  Or maybe just an IsBooted function?
+			if h.server.Environment.State() == environment.ProcessStartingState {
+				if e, ok := h.server.Environment.(*docker.Environment); ok {
+					if !e.IsAttached() {
+						return nil
+					}
+				}
+			}
+
 			return h.server.Environment.SendCommand(strings.Join(m.Args, ""))
 		}
 	}

server/archiver.go

@@ -2,9 +2,11 @@ package server
 
 import (
 	"crypto/sha256"
+	"emperror.dev/errors"
 	"encoding/hex"
 	"github.com/mholt/archiver/v3"
 	"github.com/pterodactyl/wings/config"
+	"github.com/pterodactyl/wings/server/filesystem"
 	"io"
 	"io/ioutil"
 	"os"
@@ -16,19 +18,19 @@ type Archiver struct {
 	Server *Server
 }
 
-// ArchivePath returns the path to the server's archive.
-func (a *Archiver) ArchivePath() string {
-	return filepath.Join(config.Get().System.ArchiveDirectory, a.ArchiveName())
+// Path returns the path to the server's archive.
+func (a *Archiver) Path() string {
+	return filepath.Join(config.Get().System.ArchiveDirectory, a.Name())
 }
 
-// ArchiveName returns the name of the server's archive.
-func (a *Archiver) ArchiveName() string {
-	return a.Server.Uuid + ".tar.gz"
+// Name returns the name of the server's archive.
+func (a *Archiver) Name() string {
+	return a.Server.Id() + ".tar.gz"
 }
 
 // Exists returns a boolean based off if the archive exists.
 func (a *Archiver) Exists() bool {
-	if _, err := os.Stat(a.ArchivePath()); os.IsNotExist(err) {
+	if _, err := os.Stat(a.Path()); os.IsNotExist(err) {
 		return false
 	}
 
@@ -36,13 +38,21 @@ func (a *Archiver) Exists() bool {
 }
 
 // Stat stats the archive file.
-func (a *Archiver) Stat() (*Stat, error) {
-	return a.Server.Filesystem.unsafeStat(a.ArchivePath())
+func (a *Archiver) Stat() (*filesystem.Stat, error) {
+	s, err := os.Stat(a.Path())
+	if err != nil {
+		return nil, err
+	}
+
+	return &filesystem.Stat{
+		Info:     s,
+		Mimetype: "application/tar+gzip",
+	}, nil
 }
 
 // Archive creates an archive of the server and deletes the previous one.
 func (a *Archiver) Archive() error {
-	path := a.Server.Filesystem.Path()
+	path := a.Server.Filesystem().Path()
 
 	// Get the list of root files and directories to archive.
 	var files []string
@@ -52,51 +62,56 @@ func (a *Archiver) Archive() error {
 	}
 
 	for _, file := range fileInfo {
-		files = append(files, filepath.Join(path, file.Name()))
+		f := filepath.Join(path, file.Name())
+		// If the file is a symlink we cannot safely assume that the result of a filepath.Join() will be
+		// a safe destination. We need to check if the file is a symlink, and if so pass off to the SafePath
+		// function to resolve it to the final destination.
+		//
+		// ioutil.ReadDir() calls Lstat, so this will work correctly. If it did not call Lstat, but rather
+		// just did a normal Stat call, this would fail since that would be looking at the symlink destination
+		// and not the actual file in this listing.
+		if file.Mode()&os.ModeSymlink != 0 {
+			f, err = a.Server.Filesystem().SafePath(filepath.Join(path, file.Name()))
+			if err != nil {
+				return err
+			}
+		}
+
+		files = append(files, f)
 	}
 
-	stat, err := a.Stat()
-	if err != nil && !os.IsNotExist(err) {
+	if err := a.DeleteIfExists(); err != nil {
 		return err
 	}
 
-	// Check if the file exists.
-	if stat != nil {
-		if err := os.Remove(a.ArchivePath()); err != nil {
-			return err
-		}
-	}
-
-	return archiver.NewTarGz().Archive(files, a.ArchivePath())
+	return archiver.NewTarGz().Archive(files, a.Path())
 }
 
 // DeleteIfExists deletes the archive if it exists.
 func (a *Archiver) DeleteIfExists() error {
-	stat, err := a.Stat()
-	if err != nil && !os.IsNotExist(err) {
+	if _, err := a.Stat(); err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return nil
+		}
+
 		return err
 	}
 
-	// Check if the file exists.
-	if stat != nil {
-		if err := os.Remove(a.ArchivePath()); err != nil {
-			return err
-		}
-	}
-
-	return nil
+	return errors.WithMessage(os.Remove(a.Path()), "archiver: failed to delete archive from system")
 }
 
 // Checksum computes a SHA256 checksum of the server's archive.
 func (a *Archiver) Checksum() (string, error) {
-	file, err := os.Open(a.ArchivePath())
+	file, err := os.Open(a.Path())
 	if err != nil {
 		return "", err
 	}
 	defer file.Close()
 
 	hash := sha256.New()
-	if _, err := io.Copy(hash, file); err != nil {
+
+	buf := make([]byte, 1024*4)
+	if _, err := io.CopyBuffer(hash, file, buf); err != nil {
 		return "", err
 	}
 

server/backup.go

@@ -1,115 +1,109 @@
 package server
 
 import (
-	"bufio"
-	"github.com/pkg/errors"
+	"emperror.dev/errors"
+	"github.com/apex/log"
 	"github.com/pterodactyl/wings/api"
 	"github.com/pterodactyl/wings/server/backup"
-	"go.uber.org/zap"
+	"io/ioutil"
 	"os"
-	"path"
 )
 
 // Notifies the panel of a backup's state and returns an error if one is encountered
 // while performing this action.
 func (s *Server) notifyPanelOfBackup(uuid string, ad *backup.ArchiveDetails, successful bool) error {
-	r := api.NewRequester()
-	rerr, err := r.SendBackupStatus(uuid, ad.ToRequest(successful))
-	if rerr != nil || err != nil {
-		if err != nil {
-			zap.S().Errorw(
-				"failed to notify panel of backup status due to internal code error",
-				zap.String("backup", s.Uuid),
-				zap.Error(err),
-			)
+	if err := api.New().SendBackupStatus(uuid, ad.ToRequest(successful)); err != nil {
+		if !api.IsRequestError(err) {
+			s.Log().WithFields(log.Fields{
+				"backup": uuid,
+				"error":  err,
+			}).Error("failed to notify panel of backup status due to wings error")
 
 			return err
 		}
 
-		zap.S().Warnw(rerr.String(), zap.String("backup", uuid))
-
-		return errors.New(rerr.String())
+		return errors.New(err.Error())
 	}
 
 	return nil
 }
 
 // Get all of the ignored files for a server based on its .pteroignore file in the root.
-func (s *Server) getServerwideIgnoredFiles() ([]string, error) {
-	var ignored []string
-
-	f, err := os.Open(path.Join(s.Filesystem.Path(), ".pteroignore"))
+func (s *Server) getServerwideIgnoredFiles() (string, error) {
+	f, st, err := s.Filesystem().File(".pteroignore")
 	if err != nil {
-		if !os.IsNotExist(err) {
-			return nil, err
-		}
-	} else {
-		scanner := bufio.NewScanner(f)
-		for scanner.Scan() {
-			// Only include non-empty lines, for the sake of clarity...
-			if t := scanner.Text(); t != "" {
-				ignored = append(ignored, t)
-			}
-		}
-
-		if err := scanner.Err(); err != nil {
-			return nil, err
+		if errors.Is(err, os.ErrNotExist) {
+			return "", nil
 		}
+		return "", err
 	}
-
-	return ignored, nil
-}
-
-// Get the backup files to include when generating it.
-func (s *Server) GetIncludedBackupFiles(ignored []string) (*backup.IncludedFiles, error) {
-	// If no ignored files are present in the request, check for a .pteroignore file in the root
-	// of the server files directory, and use that to generate the backup.
-	if len(ignored) == 0 {
-		if i, err := s.getServerwideIgnoredFiles(); err != nil {
-			zap.S().Warnw("failed to retrieve server ignored files", zap.String("server", s.Uuid), zap.Error(err))
-		} else {
-			ignored = i
-		}
+	defer f.Close()
+	if st.Mode()&os.ModeSymlink != 0 || st.Size() > 32*1024 {
+		// Don't read a symlinked ignore file, or a file larger than 32KiB in size.
+		return "", nil
 	}
-
-	// Get the included files based on the root path and the ignored files provided.
-	return s.Filesystem.GetIncludedFiles(s.Filesystem.Path(), ignored)
+	b, err := ioutil.ReadAll(f)
+	if err != nil {
+		return "", err
+	}
+	return string(b), nil
 }
 
 // Performs a server backup and then emits the event over the server websocket. We
 // let the actual backup system handle notifying the panel of the status, but that
 // won't emit a websocket event.
 func (s *Server) Backup(b backup.BackupInterface) error {
-	// Get the included files based on the root path and the ignored files provided.
-	inc, err := s.GetIncludedBackupFiles(b.Ignored())
-	if err != nil {
-		return errors.WithStack(err)
+	ignored := b.Ignored()
+	if b.Ignored() == "" {
+		if i, err := s.getServerwideIgnoredFiles(); err != nil {
+			log.WithField("server", s.Id()).WithField("error", err).Warn("failed to get server-wide ignored files")
+		} else {
+			ignored = i
+		}
 	}
 
-	if err := b.Generate(inc, s.Filesystem.Path()); err != nil {
-		if notifyError := s.notifyPanelOfBackup(b.Identifier(), &backup.ArchiveDetails{}, false); notifyError != nil {
-			zap.S().Warnw("failed to notify panel of failed backup state", zap.String("backup", b.Identifier()), zap.Error(err))
+	ad, err := b.Generate(s.Filesystem().Path(), ignored)
+	if err != nil {
+		if err := s.notifyPanelOfBackup(b.Identifier(), &backup.ArchiveDetails{}, false); err != nil {
+			s.Log().WithFields(log.Fields{
+				"backup": b.Identifier(),
+				"error":  err,
+			}).Warn("failed to notify panel of failed backup state")
+		} else {
+			s.Log().WithField("backup", b.Identifier()).Info("notified panel of failed backup state")
 		}
 
-		return errors.WithStack(err)
+		_ = s.Events().PublishJson(BackupCompletedEvent+":"+b.Identifier(), map[string]interface{}{
+			"uuid":          b.Identifier(),
+			"is_successful": false,
+			"checksum":      "",
+			"checksum_type": "sha1",
+			"file_size":     0,
+		})
+
+		return errors.WrapIf(err, "backup: error while generating server backup")
 	}
 
 	// Try to notify the panel about the status of this backup. If for some reason this request
 	// fails, delete the archive from the daemon and return that error up the chain to the caller.
-	ad := b.Details()
 	if notifyError := s.notifyPanelOfBackup(b.Identifier(), ad, true); notifyError != nil {
-		b.Remove()
+		_ = b.Remove()
 
-		return notifyError
+		s.Log().WithField("error", notifyError).Info("failed to notify panel of successful backup state")
+		return err
+	} else {
+		s.Log().WithField("backup", b.Identifier()).Info("notified panel of successful backup state")
 	}
 
 	// Emit an event over the socket so we can update the backup in realtime on
 	// the frontend for the server.
-	s.Events().PublishJson(BackupCompletedEvent+":"+b.Identifier(), map[string]interface{}{
-		"uuid":        b.Identifier(),
-		"sha256_hash": ad.Checksum,
-		"file_size":   ad.Size,
+	_ = s.Events().PublishJson(BackupCompletedEvent+":"+b.Identifier(), map[string]interface{}{
+		"uuid":          b.Identifier(),
+		"is_successful": true,
+		"checksum":      ad.Checksum,
+		"checksum_type": "sha1",
+		"file_size":     ad.Size,
 	})
 
 	return nil
-}
+}

server/backup/archiver.go

@@ -1,111 +0,0 @@
-package backup
-
-import (
-	"archive/tar"
-	"context"
-	gzip "github.com/klauspost/pgzip"
-	"github.com/remeh/sizedwaitgroup"
-	"go.uber.org/zap"
-	"golang.org/x/sync/errgroup"
-	"io"
-	"os"
-	"strings"
-	"sync"
-)
-
-type Archive struct {
-	sync.Mutex
-
-	TrimPrefix string
-	Files      *IncludedFiles
-}
-
-// Creates an archive at dest with all of the files definied in the included files struct.
-func (a *Archive) Create(dest string, ctx context.Context) error {
-	f, err := os.OpenFile(dest, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-
-	gzw := gzip.NewWriter(f)
-	defer gzw.Close()
-
-	tw := tar.NewWriter(gzw)
-	defer tw.Close()
-
-	wg := sizedwaitgroup.New(10)
-	g, ctx := errgroup.WithContext(ctx)
-	// Iterate over all of the files to be included and put them into the archive. This is
-	// done as a concurrent goroutine to speed things along. If an error is encountered at
-	// any step, the entire process is aborted.
-	for p, s := range a.Files.All() {
-		if (*s).IsDir() {
-			continue
-		}
-
-		pa := p
-		st := s
-
-		g.Go(func() error {
-			wg.Add()
-			defer wg.Done()
-
-			select {
-			case <-ctx.Done():
-				return ctx.Err()
-			default:
-				return a.addToArchive(pa, st, tw)
-			}
-		})
-	}
-
-	// Block until the entire routine is completed.
-	if err := g.Wait(); err != nil {
-		f.Close()
-
-		// Attempt to remove the archive if there is an error, report that error to
-		// the logger if it fails.
-		if rerr := os.Remove(dest); rerr != nil && !os.IsNotExist(rerr) {
-			zap.S().Warnw("failed to delete corrupted backup archive", zap.String("location", dest))
-		}
-
-		return err
-	}
-
-	return nil
-}
-
-// Adds a single file to the existing tar archive writer.
-func (a *Archive) addToArchive(p string, s *os.FileInfo, w *tar.Writer) error {
-	f, err := os.Open(p)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-
-	st := *s
-	header := &tar.Header{
-		// Trim the long server path from the name of the file so that the resulting
-		// archive is exactly how the user would see it in the panel file manager.
-		Name:    strings.TrimPrefix(p, a.TrimPrefix),
-		Size:    st.Size(),
-		Mode:    int64(st.Mode()),
-		ModTime: st.ModTime(),
-	}
-
-	// These actions must occur sequentially, even if this function is called multiple
-	// in parallel. You'll get some nasty panic's otherwise.
-	a.Lock()
-	defer a.Unlock()
-
-	if err = w.WriteHeader(header); err != nil {
-		return err
-	}
-
-	if _, err := io.Copy(w, f); err != nil {
-		return err
-	}
-
-	return nil
-}

server/backup/backup.go

@@ -1,34 +1,37 @@
 package backup
 
 import (
-	"crypto/sha256"
+	"crypto/sha1"
 	"encoding/hex"
-	"github.com/pkg/errors"
+	"github.com/apex/log"
 	"github.com/pterodactyl/wings/api"
 	"github.com/pterodactyl/wings/config"
-	"go.uber.org/zap"
 	"io"
 	"os"
 	"path"
 	"sync"
 )
 
+type AdapterType string
+
 const (
-	LocalBackupAdapter = "wings"
-	S3BackupAdapter    = "s3"
+	LocalBackupAdapter AdapterType = "wings"
+	S3BackupAdapter    AdapterType = "s3"
 )
 
 type ArchiveDetails struct {
-	Checksum string `json:"checksum"`
-	Size     int64  `json:"size"`
+	Checksum     string `json:"checksum"`
+	ChecksumType string `json:"checksum_type"`
+	Size         int64  `json:"size"`
 }
 
 // Returns a request object.
 func (ad *ArchiveDetails) ToRequest(successful bool) api.BackupRequest {
 	return api.BackupRequest{
-		Checksum:   ad.Checksum,
-		Size:       ad.Size,
-		Successful: successful,
+		Checksum:     ad.Checksum,
+		ChecksumType: ad.ChecksumType,
+		Size:         ad.Size,
+		Successful:   successful,
 	}
 }
 
@@ -39,7 +42,10 @@ type Backup struct {
 
 	// An array of files to ignore when generating this backup. This should be
 	// compatible with a standard .gitignore structure.
-	IgnoredFiles []string `json:"ignored_files"`
+	Ignore string `json:"ignore"`
+
+	adapter    AdapterType
+	logContext map[string]interface{}
 }
 
 // noinspection GoNameStartsWithPackageName
@@ -47,14 +53,17 @@ type BackupInterface interface {
 	// Returns the UUID of this backup as tracked by the panel instance.
 	Identifier() string
 
+	// Attaches additional context to the log output for this backup.
+	WithLogContext(map[string]interface{})
+
 	// Generates a backup in whatever the configured source for the specific
 	// implementation is.
-	Generate(*IncludedFiles, string) error
+	Generate(string, string) (*ArchiveDetails, error)
 
 	// Returns the ignored files for this backup instance.
-	Ignored() []string
+	Ignored() string
 
-	// Returns a SHA256 checksum for the generated backup.
+	// Returns a SHA1 checksum for the generated backup.
 	Checksum() ([]byte, error)
 
 	// Returns the size of the generated backup.
@@ -85,7 +94,7 @@ func (b *Backup) Path() string {
 func (b *Backup) Size() (int64, error) {
 	st, err := os.Stat(b.Path())
 	if err != nil {
-		return 0, errors.WithStack(err)
+		return 0, err
 	}
 
 	return st.Size(), nil
@@ -93,16 +102,17 @@ func (b *Backup) Size() (int64, error) {
 
 // Returns the SHA256 checksum of a backup.
 func (b *Backup) Checksum() ([]byte, error) {
-	h := sha256.New()
+	h := sha1.New()
 
 	f, err := os.Open(b.Path())
 	if err != nil {
-		return []byte{}, errors.WithStack(err)
+		return nil, err
 	}
 	defer f.Close()
 
-	if _, err := io.Copy(h, f); err != nil {
-		return []byte{}, errors.WithStack(err)
+	buf := make([]byte, 1024*4)
+	if _, err := io.CopyBuffer(h, f, buf); err != nil {
+		return nil, err
 	}
 
 	return h.Sum(nil), nil
@@ -114,17 +124,25 @@ func (b *Backup) Details() *ArchiveDetails {
 	wg := sync.WaitGroup{}
 	wg.Add(2)
 
+	l := log.WithField("backup_id", b.Uuid)
+
 	var checksum string
 	// Calculate the checksum for the file.
 	go func() {
 		defer wg.Done()
 
+		l.Info("computing checksum for backup...")
 		resp, err := b.Checksum()
 		if err != nil {
-			zap.S().Errorw("failed to calculate checksum for backup", zap.String("backup", b.Uuid), zap.Error(err))
+			log.WithFields(log.Fields{
+				"backup": b.Identifier(),
+				"error":  err,
+			}).Error("failed to calculate checksum for backup")
+			return
 		}
 
 		checksum = hex.EncodeToString(resp)
+		l.WithField("checksum", checksum).Info("computed checksum for backup")
 	}()
 
 	var sz int64
@@ -141,11 +159,22 @@ func (b *Backup) Details() *ArchiveDetails {
 	wg.Wait()
 
 	return &ArchiveDetails{
-		Checksum: checksum,
-		Size:     sz,
+		Checksum:     checksum,
+		ChecksumType: "sha1",
+		Size:         sz,
 	}
 }
 
-func (b *Backup) Ignored() []string {
-	return b.IgnoredFiles
-}
+func (b *Backup) Ignored() string {
+	return b.Ignore
+}
+
+// Returns a logger instance for this backup with the additional context fields
+// assigned to the output.
+func (b *Backup) log() *log.Entry {
+	l := log.WithField("backup", b.Identifier()).WithField("adapter", b.adapter)
+	for k, v := range b.logContext {
+		l = l.WithField(k, v)
+	}
+	return l
+}

server/backup/backup_local.go

@@ -1,8 +1,8 @@
 package backup
 
 import (
-	"context"
-	"github.com/pkg/errors"
+	"errors"
+	"github.com/pterodactyl/wings/server/filesystem"
 	"os"
 )
 
@@ -17,8 +17,8 @@ var _ BackupInterface = (*LocalBackup)(nil)
 func LocateLocal(uuid string) (*LocalBackup, os.FileInfo, error) {
 	b := &LocalBackup{
 		Backup{
-			Uuid:         uuid,
-			IgnoredFiles: nil,
+			Uuid:   uuid,
+			Ignore: "",
 		},
 	}
 
@@ -28,7 +28,7 @@ func LocateLocal(uuid string) (*LocalBackup, os.FileInfo, error) {
 	}
 
 	if st.IsDir() {
-		return nil, nil, errors.New("invalid archive found; is directory")
+		return nil, nil, errors.New("invalid archive, is directory")
 	}
 
 	return b, st, nil
@@ -39,15 +39,24 @@ func (b *LocalBackup) Remove() error {
 	return os.Remove(b.Path())
 }
 
+// Attaches additional context to the log output for this backup.
+func (b *LocalBackup) WithLogContext(c map[string]interface{}) {
+	b.logContext = c
+}
+
 // Generates a backup of the selected files and pushes it to the defined location
 // for this instance.
-func (b *LocalBackup) Generate(included *IncludedFiles, prefix string) error {
-	a := &Archive{
-		TrimPrefix: prefix,
-		Files:      included,
+func (b *LocalBackup) Generate(basePath, ignore string) (*ArchiveDetails, error) {
+	a := &filesystem.Archive{
+		BasePath: basePath,
+		Ignore:   ignore,
 	}
 
-	err := a.Create(b.Path(), context.Background())
+	b.log().Info("creating backup for server...")
+	if err := a.Create(b.Path()); err != nil {
+		return nil, err
+	}
+	b.log().Info("created backup successfully")
 
-	return err
+	return b.Details(), nil
 }

server/backup/backup_request.go

@@ -1,15 +1,14 @@
 package backup
 
 import (
+	"errors"
 	"fmt"
-	"github.com/pkg/errors"
 )
 
 type Request struct {
-	Adapter      string   `json:"adapter"`
-	Uuid         string   `json:"uuid"`
-	IgnoredFiles []string `json:"ignored_files"`
-	PresignedUrl string   `json:"presigned_url"`
+	Adapter AdapterType `json:"adapter"`
+	Uuid    string      `json:"uuid"`
+	Ignore  string      `json:"ignore"`
 }
 
 // Generates a new local backup struct.
@@ -20,8 +19,9 @@ func (r *Request) NewLocalBackup() (*LocalBackup, error) {
 
 	return &LocalBackup{
 		Backup{
-			Uuid:         r.Uuid,
-			IgnoredFiles: r.IgnoredFiles,
+			Uuid:    r.Uuid,
+			Ignore:  r.Ignore,
+			adapter: LocalBackupAdapter,
 		},
 	}, nil
 }
@@ -32,15 +32,11 @@ func (r *Request) NewS3Backup() (*S3Backup, error) {
 		return nil, errors.New(fmt.Sprintf("cannot create s3 backup using [%s] adapter", r.Adapter))
 	}
 
-	if len(r.PresignedUrl) == 0 {
-		return nil, errors.New("a valid presigned S3 upload URL must be provided to use the [s3] adapter")
-	}
-
 	return &S3Backup{
 		Backup: Backup{
-			Uuid:         r.Uuid,
-			IgnoredFiles: r.IgnoredFiles,
+			Uuid:    r.Uuid,
+			Ignore:  r.Ignore,
+			adapter: S3BackupAdapter,
 		},
-		PresignedUrl: r.PresignedUrl,
 	}, nil
 }

server/backup/backup_s3.go

@@ -1,8 +1,9 @@
 package backup
 
 import (
-	"context"
 	"fmt"
+	"github.com/pterodactyl/wings/api"
+	"github.com/pterodactyl/wings/server/filesystem"
 	"io"
 	"net/http"
 	"os"
@@ -11,74 +12,130 @@ import (
 
 type S3Backup struct {
 	Backup
-
-	// The pre-signed upload endpoint for the generated backup. This must be
-	// provided otherwise this request will fail. This allows us to keep all
-	// of the keys off the daemon instances and the panel can handle generating
-	// the credentials for us.
-	PresignedUrl string
 }
 
 var _ BackupInterface = (*S3Backup)(nil)
 
-func (s *S3Backup) Generate(included *IncludedFiles, prefix string) error {
-	defer s.Remove()
-
-	a := &Archive{
-		TrimPrefix: prefix,
-		Files:      included,
-	}
-
-	if err := a.Create(s.Path(), context.Background()); err != nil {
-		return err
-	}
-
-	fmt.Println(s.PresignedUrl)
-
-	r, err := http.NewRequest(http.MethodPut, s.PresignedUrl, nil)
-	if err != nil {
-		return err
-	}
-
-	if sz, err := s.Size(); err != nil {
-		return err
-	} else {
-		r.ContentLength = sz
-		r.Header.Add("Content-Length", strconv.Itoa(int(sz)))
-		r.Header.Add("Content-Type", "application/x-gzip")
-	}
-
-	var rc io.ReadCloser
-	if f, err := os.Open(s.Path()); err != nil {
-		return err
-	} else {
-		rc = f
-	}
-	defer rc.Close()
-
-	r.Body = rc
-	resp, err := http.DefaultClient.Do(r)
-	if err != nil {
-		return err
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK {
-		io.Copy(os.Stdout, resp.Body)
-		return fmt.Errorf("failed to put S3 object, %d:%s", resp.StatusCode, resp.Status)
-	}
-
-	return nil
-}
-
 // Removes a backup from the system.
 func (s *S3Backup) Remove() error {
 	return os.Remove(s.Path())
 }
 
-func (s *S3Backup) Details() *ArchiveDetails {
-	return &ArchiveDetails{
-		Checksum: "checksum",
-		Size:     1024,
-	}
+// Attaches additional context to the log output for this backup.
+func (s *S3Backup) WithLogContext(c map[string]interface{}) {
+	s.logContext = c
+}
+
+// Generates a new backup on the disk, moves it into the S3 bucket via the provided
+// presigned URL, and then deletes the backup from the disk.
+func (s *S3Backup) Generate(basePath, ignore string) (*ArchiveDetails, error) {
+	defer s.Remove()
+
+	a := &filesystem.Archive{
+		BasePath: basePath,
+		Ignore:   ignore,
+	}
+
+	s.log().Info("creating backup for server...")
+	if err := a.Create(s.Path()); err != nil {
+		return nil, err
+	}
+	s.log().Info("created backup successfully")
+
+	rc, err := os.Open(s.Path())
+	if err != nil {
+		return nil, err
+	}
+	defer rc.Close()
+
+	if err := s.generateRemoteRequest(rc); err != nil {
+		return nil, err
+	}
+
+	return s.Details(), nil
+}
+
+// Reader provides a wrapper around an existing io.Reader
+// but implements io.Closer in order to satisfy an io.ReadCloser.
+type Reader struct {
+	io.Reader
+}
+
+func (Reader) Close() error {
+	return nil
+}
+
+// Generates the remote S3 request and begins the upload.
+func (s *S3Backup) generateRemoteRequest(rc io.ReadCloser) error {
+	defer rc.Close()
+
+	s.log().Debug("attempting to get size of backup...")
+	size, err := s.Backup.Size()
+	if err != nil {
+		return err
+	}
+	s.log().WithField("size", size).Debug("got size of backup")
+
+	s.log().Debug("attempting to get S3 upload urls from Panel...")
+	urls, err := api.New().GetBackupRemoteUploadURLs(s.Backup.Uuid, size)
+	if err != nil {
+		return err
+	}
+	s.log().Debug("got S3 upload urls from the Panel")
+	s.log().WithField("parts", len(urls.Parts)).Info("attempting to upload backup to s3 endpoint...")
+
+	handlePart := func(part string, size int64) (string, error) {
+		r, err := http.NewRequest(http.MethodPut, part, nil)
+		if err != nil {
+			return "", err
+		}
+
+		r.ContentLength = size
+		r.Header.Add("Content-Length", strconv.Itoa(int(size)))
+		r.Header.Add("Content-Type", "application/x-gzip")
+
+		// Limit the reader to the size of the part.
+		r.Body = Reader{Reader: io.LimitReader(rc, size)}
+
+		// This http request can block forever due to it not having a timeout,
+		// but we are uploading up to 5GB of data, so there is not really
+		// a good way to handle a timeout on this.
+		res, err := http.DefaultClient.Do(r)
+		if err != nil {
+			return "", err
+		}
+		defer res.Body.Close()
+
+		// Handle non-200 status codes.
+		if res.StatusCode != http.StatusOK {
+			return "", fmt.Errorf("failed to put S3 object part, %d:%s", res.StatusCode, res.Status)
+		}
+
+		// Get the ETag from the uploaded part, this should be sent with the CompleteMultipartUpload request.
+		return res.Header.Get("ETag"), nil
+	}
+
+	for i, part := range urls.Parts {
+		// Get the size for the current part.
+		var partSize int64
+		if i+1 < len(urls.Parts) {
+			partSize = urls.PartSize
+		} else {
+			// This is the remaining size for the last part,
+			// there is not a minimum size limit for the last part.
+			partSize = size - (int64(i) * urls.PartSize)
+		}
+
+		// Attempt to upload the part.
+		if _, err := handlePart(part, partSize); err != nil {
+			s.log().WithField("part_id", i+1).WithError(err).Warn("failed to upload part")
+			return err
+		}
+
+		s.log().WithField("part_id", i+1).Info("successfully uploaded backup part")
+	}
+
+	s.log().WithField("parts", len(urls.Parts)).Info("backup has been successfully uploaded")
+
+	return nil
 }

server/backup/included.go

@@ -1,31 +0,0 @@
-package backup
-
-import (
-	"os"
-	"sync"
-)
-
-type IncludedFiles struct {
-	sync.RWMutex
-	files map[string]*os.FileInfo
-}
-
-// Pushes an additional file or folder onto the struct.
-func (i *IncludedFiles) Push(info *os.FileInfo, p string) {
-	i.Lock()
-	defer i.Unlock()
-
-	if i.files == nil {
-		i.files = make(map[string]*os.FileInfo)
-	}
-
-	i.files[p] = info
-}
-
-// Returns all of the files that were marked as being included.
-func (i *IncludedFiles) All() map[string]*os.FileInfo {
-	i.RLock()
-	defer i.RUnlock()
-
-	return i.files
-}

server/collection.go

@@ -60,6 +60,8 @@ func (c *Collection) Find(filter func(*Server) bool) *Server {
 }
 
 // Removes all items from the collection that match the filter function.
+//
+// TODO: cancel the context?
 func (c *Collection) Remove(filter func(*Server) bool) {
 	c.Lock()
 	defer c.Unlock()

server/config_parser.go

@@ -1,34 +1,32 @@
 package server
 
 import (
-	"github.com/pterodactyl/wings/parser"
-	"go.uber.org/zap"
-	"sync"
+	"github.com/gammazero/workerpool"
+	"runtime"
 )
 
 // Parent function that will update all of the defined configuration files for a server
 // automatically to ensure that they always use the specified values.
 func (s *Server) UpdateConfigurationFiles() {
-	wg := new(sync.WaitGroup)
+	pool := workerpool.New(runtime.NumCPU())
 
-	for _, v := range s.processConfiguration.ConfigurationFiles {
-		wg.Add(1)
+	files := s.ProcessConfiguration().ConfigurationFiles
+	for _, cf := range files {
+		f := cf
 
-		go func(f parser.ConfigurationFile, server *Server) {
-			defer wg.Done()
-
-			p, err := s.Filesystem.SafePath(f.FileName)
+		pool.Submit(func() {
+			p, err := s.Filesystem().SafePath(f.FileName)
 			if err != nil {
-				zap.S().Errorw("failed to generate safe path for configuration file", zap.String("server", server.Uuid), zap.Error(err))
+				s.Log().WithField("error", err).Error("failed to generate safe path for configuration file")
 
 				return
 			}
 
 			if err := f.Parse(p, false); err != nil {
-				zap.S().Errorw("failed to parse and update server configuration file", zap.String("server", server.Uuid), zap.Error(err))
+				s.Log().WithField("error", err).Error("failed to parse and update server configuration file")
 			}
-		}(v, s)
+		})
 	}
 
-	wg.Wait()
-}
+	pool.StopWait()
+}

server/configuration.go

@@ -0,0 +1,76 @@
+package server
+
+import (
+	"github.com/pterodactyl/wings/environment"
+	"sync"
+)
+
+type Configuration struct {
+	mu sync.RWMutex
+
+	// The unique identifier for the server that should be used when referencing
+	// it against the Panel API (and internally). This will be used when naming
+	// docker containers as well as in log output.
+	Uuid string `json:"uuid"`
+
+	// Whether or not the server is in a suspended state. Suspended servers cannot
+	// be started or modified except in certain scenarios by an admin user.
+	Suspended bool `json:"suspended"`
+
+	// The command that should be used when booting up the server instance.
+	Invocation string `json:"invocation"`
+
+	// By default this is false, however if selected within the Panel while installing or re-installing a
+	// server, specific installation scripts will be skipped for the server process.
+	SkipEggScripts bool `default:"false" json:"skip_egg_scripts"`
+
+	// An array of environment variables that should be passed along to the running
+	// server process.
+	EnvVars environment.Variables `json:"environment"`
+
+	Allocations           environment.Allocations `json:"allocations"`
+	Build                 environment.Limits      `json:"build"`
+	CrashDetectionEnabled bool                    `default:"true" json:"enabled" yaml:"enabled"`
+	Mounts                []Mount                 `json:"mounts"`
+	Resources             ResourceUsage           `json:"resources"`
+
+	Container struct {
+		// Defines the Docker image that will be used for this server
+		Image string `json:"image,omitempty"`
+	} `json:"container,omitempty"`
+}
+
+func (s *Server) Config() *Configuration {
+	s.cfg.mu.RLock()
+	defer s.cfg.mu.RUnlock()
+
+	return &s.cfg
+}
+
+// Returns the amount of disk space available to a server in bytes.
+func (s *Server) DiskSpace() int64 {
+	s.cfg.mu.RLock()
+	defer s.cfg.mu.RUnlock()
+
+	return s.cfg.Build.DiskSpace * 1024.0 * 1024.0
+}
+
+func (s *Server) MemoryLimit() int64 {
+	s.cfg.mu.RLock()
+	defer s.cfg.mu.RUnlock()
+
+	return s.cfg.Build.MemoryLimit
+}
+
+func (c *Configuration) GetUuid() string {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
+	return c.Uuid
+}
+
+func (c *Configuration) SetSuspended(s bool) {
+	c.mu.Lock()
+	c.Suspended = s
+	c.mu.Unlock()
+}

server/console.go

@@ -1,27 +1,124 @@
 package server
 
 import (
+	"context"
+	"emperror.dev/errors"
 	"fmt"
 	"github.com/mitchellh/colorstring"
-	"io"
+	"github.com/pterodactyl/wings/config"
+	"github.com/pterodactyl/wings/system"
+	"sync"
+	"sync/atomic"
+	"time"
 )
 
-type Console struct {
-	Server      *Server
-	HandlerFunc *func(string)
+var ErrTooMuchConsoleData = errors.New("console is outputting too much data")
+
+type ConsoleThrottler struct {
+	mu sync.Mutex
+	config.ConsoleThrottles
+
+	// The total number of activations that have occurred thus far.
+	activations uint64
+
+	// The total number of lines that have been sent since the last reset timer period.
+	count uint64
+
+	// Wether or not the console output is being throttled. It is up to calling code to
+	// determine what to do if it is.
+	isThrottled *system.AtomicBool
+
+	// The total number of lines processed so far during the given time period.
+	timerCancel *context.CancelFunc
 }
 
-var _ io.Writer = Console{}
+// Resets the state of the throttler.
+func (ct *ConsoleThrottler) Reset() {
+	atomic.StoreUint64(&ct.count, 0)
+	atomic.StoreUint64(&ct.activations, 0)
+	ct.isThrottled.Store(false)
+}
 
-func (c Console) Write(b []byte) (int, error) {
-	if c.HandlerFunc != nil {
-		l := make([]byte, len(b))
-		copy(l, b)
+// Triggers an activation for a server. You can also decrement the number of activations
+// by passing a negative number.
+func (ct *ConsoleThrottler) markActivation(increment bool) uint64 {
+	if !increment {
+		if atomic.LoadUint64(&ct.activations) == 0 {
+			return 0
+		}
 
-		(*c.HandlerFunc)(string(l))
+		// This weird dohicky subtracts 1 from the activation count.
+		return atomic.AddUint64(&ct.activations, ^uint64(0))
 	}
 
-	return len(b), nil
+	return atomic.AddUint64(&ct.activations, 1)
+}
+
+// Determines if the console is currently being throttled. Calls to this function can be used to
+// determine if output should be funneled along to the websocket processes.
+func (ct *ConsoleThrottler) Throttled() bool {
+	return ct.isThrottled.Load()
+}
+
+// Starts a timer that runs in a seperate thread and will continually decrement the lines processed
+// and number of activations, regardless of the current console message volume. All of the timers
+// are canceled if the context passed through is canceled.
+func (ct *ConsoleThrottler) StartTimer(ctx context.Context) {
+	system.Every(ctx, time.Duration(int64(ct.LineResetInterval))*time.Millisecond, func(_ time.Time) {
+		ct.isThrottled.Store(false)
+		atomic.StoreUint64(&ct.count, 0)
+	})
+
+	system.Every(ctx, time.Duration(int64(ct.DecayInterval))*time.Millisecond, func(_ time.Time) {
+		ct.markActivation(false)
+	})
+}
+
+// Handles output from a server's console. This code ensures that a server is not outputting
+// an excessive amount of data to the console that could indicate a malicious or run-away process
+// and lead to performance issues for other users.
+//
+// This was much more of a problem for the NodeJS version of the daemon which struggled to handle
+// large volumes of output. However, this code is much more performant so I generally feel a lot
+// better about it's abilities.
+//
+// However, extreme output is still somewhat of a DoS attack vector against this software since we
+// are still logging it to the disk temporarily and will want to avoid dumping a huge amount of
+// data all at once. These values are all configurable via the wings configuration file, however the
+// defaults have been in the wild for almost two years at the time of this writing, so I feel quite
+// confident in them.
+//
+// This function returns an error if the server should be stopped due to violating throttle constraints
+// and a boolean value indicating if a throttle is being violated when it is checked.
+func (ct *ConsoleThrottler) Increment(onTrigger func()) error {
+	if !ct.Enabled {
+		return nil
+	}
+
+	// Increment the line count and if we have now output more lines than are allowed, trigger a throttle
+	// activation. Once the throttle is triggered and has passed the kill at value we will trigger a server
+	// stop automatically.
+	if atomic.AddUint64(&ct.count, 1) >= ct.Lines && !ct.Throttled() {
+		ct.isThrottled.Store(true)
+		if ct.markActivation(true) >= ct.MaximumTriggerCount {
+			return ErrTooMuchConsoleData
+		}
+
+		onTrigger()
+	}
+
+	return nil
+}
+
+// Returns the throttler instance for the server or creates a new one.
+func (s *Server) Throttler() *ConsoleThrottler {
+	s.throttleOnce.Do(func() {
+		s.throttler = &ConsoleThrottler{
+			isThrottled: system.NewAtomicBool(false),
+			ConsoleThrottles: config.Get().Throttles,
+		}
+	})
+	return s.throttler
 }
 
 // Sends output to the server console formatted to appear correctly as being sent

server/crash.go

@@ -2,42 +2,53 @@ package server
 
 import (
 	"fmt"
-	"github.com/pkg/errors"
 	"github.com/pterodactyl/wings/config"
-	"go.uber.org/zap"
+	"github.com/pterodactyl/wings/environment"
+	"strconv"
+	"sync"
 	"time"
 )
 
-type CrashDetection struct {
-	// If set to false, the system will not listen for crash detection events that
-	// can indicate that the server stopped unexpectedly.
-	Enabled bool `default:"true" json:"enabled" yaml:"enabled"`
+type CrashHandler struct {
+	mu sync.RWMutex
 
 	// Tracks the time of the last server crash event.
 	lastCrash time.Time
 }
 
+// Returns the time of the last crash for this server instance.
+func (cd *CrashHandler) LastCrashTime() time.Time {
+	cd.mu.RLock()
+	defer cd.mu.RUnlock()
+
+	return cd.lastCrash
+}
+
+// Sets the last crash time for a server.
+func (cd *CrashHandler) SetLastCrash(t time.Time) {
+	cd.mu.Lock()
+	cd.lastCrash = t
+	cd.mu.Unlock()
+}
+
 // Looks at the environment exit state to determine if the process exited cleanly or
 // if it was the result of an event that we should try to recover from.
 //
 // This function assumes it is called under circumstances where a crash is suspected
-// of occuring. It will not do anything to determine if it was actually a crash, just
+// of occurring. It will not do anything to determine if it was actually a crash, just
 // look at the exit state and check if it meets the criteria of being called a crash
 // by Wings.
 //
 // If the server is determined to have crashed, the process will be restarted and the
 // counter for the server will be incremented.
-//
-// @todo output event to server console
 func (s *Server) handleServerCrash() error {
 	// No point in doing anything here if the server isn't currently offline, there
 	// is no reason to do a crash detection event. If the server crash detection is
 	// disabled we want to skip anything after this as well.
-	if s.GetState() != ProcessOfflineState || !s.CrashDetection.Enabled {
-		if !s.CrashDetection.Enabled {
-			zap.S().Debugw("server triggered crash detection but handler is disabled for server process", zap.String("server", s.Uuid))
-
-			s.PublishConsoleOutputFromDaemon("Server detected as crashed; crash detection is disabled for this instance.")
+	if s.Environment.State() != environment.ProcessOfflineState || !s.Config().CrashDetectionEnabled {
+		if !s.Config().CrashDetectionEnabled {
+			s.Log().Debug("server triggered crash detection but handler is disabled for server process")
+			s.PublishConsoleOutputFromDaemon("Aborting automatic restart, crash detection is disabled for this instance.")
 		}
 
 		return nil
@@ -45,14 +56,13 @@ func (s *Server) handleServerCrash() error {
 
 	exitCode, oomKilled, err := s.Environment.ExitState()
 	if err != nil {
-		return errors.WithStack(err)
+		return err
 	}
 
 	// If the system is not configured to detect a clean exit code as a crash, and the
 	// crash is not the result of the program running out of memory, do nothing.
-	if exitCode == 0 && !oomKilled && !config.Get().System.DetectCleanExitAsCrash {
-		zap.S().Debugw("server exited with successful code; system configured to not detect as crash", zap.String("server", s.Uuid))
-
+	if exitCode == 0 && !oomKilled && !config.Get().System.CrashDetection.DetectCleanExitAsCrash {
+		s.Log().Debug("server exited with successful exit code; system is configured to not detect this as a crash")
 		return nil
 	}
 
@@ -60,16 +70,19 @@ func (s *Server) handleServerCrash() error {
 	s.PublishConsoleOutputFromDaemon(fmt.Sprintf("Exit code: %d", exitCode))
 	s.PublishConsoleOutputFromDaemon(fmt.Sprintf("Out of memory: %t", oomKilled))
 
-	c := s.CrashDetection.lastCrash
-	// If the last crash time was within the last 60 seconds we do not want to perform
-	// an automatic reboot of the process. Return an error that can be handled.
-	if !c.IsZero() && c.Add(time.Second * 60).After(time.Now()) {
-		s.PublishConsoleOutputFromDaemon("Aborting automatic reboot: last crash occurred less than 60 seconds ago.")
+	c := s.crasher.LastCrashTime()
+	timeout := config.Get().System.CrashDetection.Timeout
 
+	// If the last crash time was within the last `timeout` seconds we do not want to perform
+	// an automatic reboot of the process. Return an error that can be handled.
+	//
+	// If timeout is set to 0, always reboot the server (this is probably a terrible idea, but some people want it)
+	if timeout != 0 && !c.IsZero() && c.Add(time.Second*time.Duration(config.Get().System.CrashDetection.Timeout)).After(time.Now()) {
+		s.PublishConsoleOutputFromDaemon("Aborting automatic restart, last crash occurred less than " + strconv.Itoa(timeout) + " seconds ago.")
 		return &crashTooFrequent{}
 	}
 
-	s.CrashDetection.lastCrash = time.Now()
+	s.crasher.SetLastCrash(time.Now())
 
-	return s.Environment.Start()
-}
+	return s.HandlePowerAction(PowerActionStart)
+}

server/environment_docker.go

@@ -1,849 +0,0 @@
-package server
-
-import (
-	"bufio"
-	"bytes"
-	"context"
-	"encoding/json"
-	"fmt"
-	"github.com/docker/docker/api/types"
-	"github.com/docker/docker/api/types/container"
-	"github.com/docker/docker/api/types/mount"
-	"github.com/docker/docker/client"
-	"github.com/docker/docker/daemon/logger/jsonfilelog"
-	"github.com/docker/go-connections/nat"
-	"github.com/pkg/errors"
-	"github.com/pterodactyl/wings/api"
-	"github.com/pterodactyl/wings/config"
-	"go.uber.org/zap"
-	"io"
-	"math"
-	"os"
-	"strconv"
-	"strings"
-	"time"
-)
-
-// Defines the base environment for Docker instances running through Wings.
-type DockerEnvironment struct {
-	Server *Server
-
-	// The Docker client being used for this instance.
-	Client *client.Client
-
-	// Tracks if we are currently attached to the server container. This allows us to attach
-	// once and then just use that attachment to stream logs out of the server and also stream
-	// commands back into it without constantly attaching and detaching.
-	attached bool
-
-	// Controls the hijacked response stream which exists only when we're attached to
-	// the running container instance.
-	stream types.HijackedResponse
-
-	// Holds the stats stream used by the polling commands so that we can easily close
-	// it out.
-	stats io.ReadCloser
-}
-
-// Creates a new base Docker environment. A server must still be attached to it.
-func NewDockerEnvironment(server *Server) error {
-	cli, err := client.NewClientWithOpts(client.FromEnv)
-	if err != nil {
-		return err
-	}
-
-	server.Environment = &DockerEnvironment{
-		Server: server,
-		Client: cli,
-	}
-
-	return nil
-}
-
-// Ensure that the Docker environment is always implementing all of the methods
-// from the base environment interface.
-var _ Environment = (*DockerEnvironment)(nil)
-
-// Returns the name of the environment.
-func (d *DockerEnvironment) Type() string {
-	return "docker"
-}
-
-// Determines if the container exists in this environment.
-func (d *DockerEnvironment) Exists() (bool, error) {
-	_, err := d.Client.ContainerInspect(context.Background(), d.Server.Uuid)
-
-	if err != nil {
-		// If this error is because the container instance wasn't found via Docker we
-		// can safely ignore the error and just return false.
-		if client.IsErrNotFound(err) {
-			return false, nil
-		}
-
-		return false, err
-	}
-
-	return true, nil
-}
-
-// Determines if the server's docker container is currently running. If there is no container
-// present, an error will be raised (since this shouldn't be a case that ever happens under
-// correctly developed circumstances).
-//
-// You can confirm if the instance wasn't found by using client.IsErrNotFound from the Docker
-// API.
-//
-// @see docker/client/errors.go
-func (d *DockerEnvironment) IsRunning() (bool, error) {
-	ctx := context.Background()
-
-	c, err := d.Client.ContainerInspect(ctx, d.Server.Uuid)
-	if err != nil {
-		return false, err
-	}
-
-	return c.State.Running, nil
-}
-
-// Performs an in-place update of the Docker container's resource limits without actually
-// making any changes to the operational state of the container. This allows memory, cpu,
-// and IO limitations to be adjusted on the fly for individual instances.
-func (d *DockerEnvironment) InSituUpdate() error {
-	if _, err := d.Client.ContainerInspect(context.Background(), d.Server.Uuid); err != nil {
-		// If the container doesn't exist for some reason there really isn't anything
-		// we can do to fix that in this process (it doesn't make sense at least). In those
-		// cases just return without doing anything since we still want to save the configuration
-		// to the disk.
-		//
-		// We'll let a boot process make modifications to the container if needed at this point.
-		if client.IsErrNotFound(err) {
-			return nil
-		}
-
-		return errors.WithStack(err)
-	}
-
-	u := container.UpdateConfig{
-		Resources: d.getResourcesForServer(),
-	}
-
-	if _, err := d.Client.ContainerUpdate(context.Background(), d.Server.Uuid, u); err != nil {
-		return errors.WithStack(err)
-	}
-
-	return nil
-}
-
-// Run before the container starts and get the process configuration from the Panel.
-// This is important since we use this to check configuration files as well as ensure
-// we always have the latest version of an egg available for server processes.
-//
-// This process will also confirm that the server environment exists and is in a bootable
-// state. This ensures that unexpected container deletion while Wings is running does
-// not result in the server becoming unbootable.
-func (d *DockerEnvironment) OnBeforeStart() error {
-	zap.S().Infow("syncing server configuration with Panel", zap.String("server", d.Server.Uuid))
-	if err := d.Server.Sync(); err != nil {
-		return err
-	}
-
-	if !d.Server.Filesystem.HasSpaceAvailable() {
-		return errors.New("cannot start server, not enough disk space available")
-	}
-
-	// Always destroy and re-create the server container to ensure that synced data from
-	// the Panel is used.
-	if err := d.Client.ContainerRemove(context.Background(), d.Server.Uuid, types.ContainerRemoveOptions{RemoveVolumes: true}); err != nil {
-		if !client.IsErrNotFound(err) {
-			return err
-		}
-	}
-
-	// The Create() function will check if the container exists in the first place, and if
-	// so just silently return without an error. Otherwise, it will try to create the necessary
-	// container and data storage directory.
-	//
-	// This won't actually run an installation process however, it is just here to ensure the
-	// environment gets created properly if it is missing and the server is started. We're making
-	// an assumption that all of the files will still exist at this point.
-	if err := d.Create(); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-// Starts the server environment and begins piping output to the event listeners for the
-// console. If a container does not exist, or needs to be rebuilt that will happen in the
-// call to OnBeforeStart().
-func (d *DockerEnvironment) Start() error {
-	sawError := false
-	// If sawError is set to true there was an error somewhere in the pipeline that
-	// got passed up, but we also want to ensure we set the server to be offline at
-	// that point.
-	defer func() {
-		if sawError {
-			d.Server.SetState(ProcessOfflineState)
-		}
-	}()
-
-	// If the server is suspended the user shouldn't be able to boot it, in those cases
-	// return a suspension error and let the calling area handle the issue.
-	//
-	// Theoretically you'd have the Panel handle all of this logic, but we cannot do that
-	// because we allow the websocket to control the server power state as well, so we'll
-	// need to handle that action in here.
-	if d.Server.Suspended {
-		return &suspendedError{}
-	}
-
-	c, err := d.Client.ContainerInspect(context.Background(), d.Server.Uuid)
-	if err != nil && !client.IsErrNotFound(err) {
-		return errors.WithStack(err)
-	}
-
-	// No reason to try starting a container that is already running.
-	if c.State.Running {
-		d.Server.SetState(ProcessRunningState)
-
-		return d.Attach()
-	}
-
-	d.Server.SetState(ProcessStartingState)
-	// Set this to true for now, we will set it to false once we reach the
-	// end of this chain.
-	sawError = true
-
-	// Run the before start function and wait for it to finish. This will validate that the container
-	// exists on the system, and rebuild the container if that is required for server booting to
-	// occur.
-	if err := d.OnBeforeStart(); err != nil {
-		return errors.WithStack(err)
-	}
-
-	// Truncate the log file so we don't end up outputting a bunch of useless log information
-	// to the websocket and whatnot. Check first that the path and file exist before trying
-	// to truncate them.
-	if _, err := os.Stat(c.LogPath); err == nil {
-		if err := os.Truncate(c.LogPath, 0); err != nil {
-			return errors.WithStack(err)
-		}
-	}
-
-	// Update the configuration files defined for the server before beginning the boot process.
-	// This process executes a bunch of parallel updates, so we just block until that process
-	// is completed. Any errors as a result of this will just be bubbled out in the logger,
-	// we don't need to actively do anything about it at this point, worst comes to worst the
-	// server starts in a weird state and the user can manually adjust.
-	d.Server.UpdateConfigurationFiles()
-
-	// Reset the permissions on files for the server before actually trying
-	// to start it.
-	if err := d.Server.Filesystem.Chown("/"); err != nil {
-		return errors.WithStack(err)
-	}
-
-	opts := types.ContainerStartOptions{}
-	if err := d.Client.ContainerStart(context.Background(), d.Server.Uuid, opts); err != nil {
-		return errors.WithStack(err)
-	}
-
-	// No errors, good to continue through.
-	sawError = false
-
-	return d.Attach()
-}
-
-// Stops the container that the server is running in. This will allow up to 10
-// seconds to pass before a failure occurs.
-func (d *DockerEnvironment) Stop() error {
-	stop := d.Server.processConfiguration.Stop
-	if stop.Type == api.ProcessStopSignal {
-		return d.Terminate(os.Kill)
-	}
-
-	d.Server.SetState(ProcessStoppingState)
-	if stop.Type == api.ProcessStopCommand {
-		return d.SendCommand(stop.Value)
-	}
-
-	t := time.Second * 10
-
-	return d.Client.ContainerStop(context.Background(), d.Server.Uuid, &t)
-}
-
-// Attempts to gracefully stop a server using the defined stop command. If the server
-// does not stop after seconds have passed, an error will be returned, or the instance
-// will be terminated forcefully depending on the value of the second argument.
-func (d *DockerEnvironment) WaitForStop(seconds int, terminate bool) error {
-	if d.Server.GetState() == ProcessOfflineState {
-		return nil
-	}
-
-	if err := d.Stop(); err != nil {
-		return errors.WithStack(err)
-	}
-
-	ctx, cancel := context.WithTimeout(context.Background(), time.Duration(seconds)*time.Second)
-	defer cancel()
-
-	// Block the return of this function until the container as been marked as no
-	// longer running. If this wait does not end by the time seconds have passed,
-	// attempt to terminate the container, or return an error.
-	ok, errChan := d.Client.ContainerWait(ctx, d.Server.Uuid, container.WaitConditionNotRunning)
-	select {
-	case <-ctx.Done():
-		if ctxErr := ctx.Err(); ctxErr != nil {
-			if terminate {
-				return d.Terminate(os.Kill)
-			}
-
-			return errors.WithStack(ctxErr)
-		}
-	case err := <-errChan:
-		if err != nil {
-			return errors.WithStack(err)
-		}
-	case <-ok:
-	}
-
-	return nil
-}
-
-// Forcefully terminates the container using the signal passed through.
-func (d *DockerEnvironment) Terminate(signal os.Signal) error {
-	ctx := context.Background()
-
-	c, err := d.Client.ContainerInspect(ctx, d.Server.Uuid)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	if !c.State.Running {
-		return nil
-	}
-
-	d.Server.SetState(ProcessStoppingState)
-
-	return d.Client.ContainerKill(
-		ctx, d.Server.Uuid, strings.TrimSuffix(strings.TrimPrefix(signal.String(), "signal "), "ed"),
-	)
-}
-
-// Remove the Docker container from the machine. If the container is currently running
-// it will be forcibly stopped by Docker.
-func (d *DockerEnvironment) Destroy() error {
-	ctx := context.Background()
-
-	// Avoid crash detection firing off.
-	d.Server.SetState(ProcessStoppingState)
-
-	return d.Client.ContainerRemove(ctx, d.Server.Uuid, types.ContainerRemoveOptions{
-		RemoveVolumes: true,
-		RemoveLinks:   false,
-		Force:         true,
-	})
-}
-
-// Determine the container exit state and return the exit code and wether or not
-// the container was killed by the OOM killer.
-func (d *DockerEnvironment) ExitState() (uint32, bool, error) {
-	c, err := d.Client.ContainerInspect(context.Background(), d.Server.Uuid)
-	if err != nil {
-		return 0, false, errors.WithStack(err)
-	}
-
-	return uint32(c.State.ExitCode), c.State.OOMKilled, nil
-}
-
-// Attaches to the docker container itself and ensures that we can pipe data in and out
-// of the process stream. This should not be used for reading console data as you *will*
-// miss important output at the beginning because of the time delay with attaching to the
-// output.
-func (d *DockerEnvironment) Attach() error {
-	if d.attached {
-		return nil
-	}
-
-	if err := d.FollowConsoleOutput(); err != nil {
-		return errors.WithStack(err)
-	}
-
-	ctx := context.Background()
-
-	var err error
-	d.stream, err = d.Client.ContainerAttach(ctx, d.Server.Uuid, types.ContainerAttachOptions{
-		Stdin:  true,
-		Stdout: true,
-		Stderr: true,
-		Stream: true,
-	})
-
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	console := Console{
-		Server: d.Server,
-	}
-
-	d.attached = true
-	go func() {
-		if err := d.EnableResourcePolling(); err != nil {
-			zap.S().Warnw("failed to enabled resource polling on server", zap.String("server", d.Server.Uuid), zap.Error(errors.WithStack(err)))
-		}
-	}()
-
-	go func() {
-		defer d.stream.Close()
-		defer func() {
-			d.Server.SetState(ProcessOfflineState)
-			d.attached = false
-		}()
-
-		io.Copy(console, d.stream.Reader)
-	}()
-
-	return nil
-}
-
-// Attaches to the log for the container. This avoids us missing cruicial output that
-// happens in the split seconds before the code moves from 'Starting' to 'Attaching'
-// on the process.
-func (d *DockerEnvironment) FollowConsoleOutput() error {
-	if exists, err := d.Exists(); !exists {
-		if err != nil {
-			return errors.WithStack(err)
-		}
-
-		return errors.New(fmt.Sprintf("no such container: %s", d.Server.Uuid))
-	}
-
-	ctx := context.Background()
-	opts := types.ContainerLogsOptions{
-		ShowStderr: true,
-		ShowStdout: true,
-		Follow:     true,
-		Since:      time.Now().Format(time.RFC3339),
-	}
-
-	reader, err := d.Client.ContainerLogs(ctx, d.Server.Uuid, opts)
-
-	go func(r io.ReadCloser) {
-		defer r.Close()
-
-		s := bufio.NewScanner(r)
-		for s.Scan() {
-			d.Server.Events().Publish(ConsoleOutputEvent, s.Text())
-		}
-
-		if err := s.Err(); err != nil {
-			zap.S().Warnw("error processing scanner line in console output", zap.String("server", d.Server.Uuid), zap.Error(err))
-		}
-	}(reader)
-
-	return errors.WithStack(err)
-}
-
-// Enables resource polling on the docker instance. Except we aren't actually polling Docker for this
-// information, instead just sit there with an async process that lets Docker stream all of this data
-// to us automatically.
-func (d *DockerEnvironment) EnableResourcePolling() error {
-	if d.Server.GetState() == ProcessOfflineState {
-		return errors.New("cannot enable resource polling on a server that is not running")
-	}
-
-	ctx := context.Background()
-
-	stats, err := d.Client.ContainerStats(ctx, d.Server.Uuid, true)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	d.stats = stats.Body
-
-	dec := json.NewDecoder(d.stats)
-	go func(s *Server) {
-		for {
-			var v *types.StatsJSON
-
-			if err := dec.Decode(&v); err != nil {
-				if err != io.EOF {
-					zap.S().Warnw("encountered error processing server stats; stopping collection", zap.Error(err))
-				}
-
-				d.DisableResourcePolling()
-				return
-			}
-
-			// Disable collection if the server is in an offline state and this process is
-			// still running.
-			if s.GetState() == ProcessOfflineState {
-				d.DisableResourcePolling()
-				return
-			}
-
-			s.Resources.CpuAbsolute = s.Resources.CalculateAbsoluteCpu(&v.PreCPUStats, &v.CPUStats)
-			s.Resources.Memory = v.MemoryStats.Usage
-			s.Resources.MemoryLimit = v.MemoryStats.Limit
-
-			// Why you ask? This already has the logic for caching disk space in use and then
-			// also handles pushing that value to the resources object automatically.
-			s.Filesystem.HasSpaceAvailable()
-
-			for _, nw := range v.Networks {
-				s.Resources.Network.RxBytes += nw.RxBytes
-				s.Resources.Network.TxBytes += nw.TxBytes
-			}
-
-			b, _ := json.Marshal(s.Resources)
-			s.Events().Publish(StatsEvent, string(b))
-		}
-	}(d.Server)
-
-	return nil
-}
-
-// Closes the stats stream for a server process.
-func (d *DockerEnvironment) DisableResourcePolling() error {
-	if d.stats == nil {
-		return nil
-	}
-
-	err := d.stats.Close()
-
-	d.Server.Resources.CpuAbsolute = 0
-	d.Server.Resources.Memory = 0
-	d.Server.Resources.Network.TxBytes = 0
-	d.Server.Resources.Network.RxBytes = 0
-
-	return errors.WithStack(err)
-}
-
-// Pulls the image from Docker.
-//
-// @todo handle authorization & local images
-func (d *DockerEnvironment) ensureImageExists(c *client.Client) error {
-	out, err := c.ImagePull(context.Background(), d.Server.Container.Image, types.ImagePullOptions{All: false})
-	if err != nil {
-		return err
-	}
-	defer out.Close()
-
-	zap.S().Debugw("pulling docker image... this could take a bit of time", zap.String("image", d.Server.Container.Image))
-
-	// I'm not sure what the best approach here is, but this will block execution until the image
-	// is done being pulled, which is what we need.
-	scanner := bufio.NewScanner(out)
-	for scanner.Scan() {
-		continue
-	}
-
-	if err := scanner.Err(); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-// Creates a new container for the server using all of the data that is currently
-// available for it. If the container already exists it will be returned.
-//
-// @todo pull the image being requested if it doesn't exist currently.
-func (d *DockerEnvironment) Create() error {
-	ctx := context.Background()
-	cli, err := client.NewClientWithOpts(client.FromEnv)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	// Ensure the data directory exists before getting too far through this process.
-	if err := d.Server.Filesystem.EnsureDataDirectory(); err != nil {
-		return errors.WithStack(err)
-	}
-
-	// If the container already exists don't hit the user with an error, just return
-	// the current information about it which is what we would do when creating the
-	// container anyways.
-	if _, err := cli.ContainerInspect(ctx, d.Server.Uuid); err == nil {
-		return nil
-	} else if !client.IsErrNotFound(err) {
-		return errors.WithStack(err)
-	}
-
-	// Try to pull the requested image before creating the container.
-	if err := d.ensureImageExists(cli); err != nil {
-		return errors.WithStack(err)
-	}
-
-	conf := &container.Config{
-		Hostname:     "container",
-		User:         strconv.Itoa(config.Get().System.User.Uid),
-		AttachStdin:  true,
-		AttachStdout: true,
-		AttachStderr: true,
-		OpenStdin:    true,
-		Tty:          true,
-
-		ExposedPorts: d.exposedPorts(),
-
-		Image: d.Server.Container.Image,
-		Env:   d.environmentVariables(),
-
-		Labels: map[string]string{
-			"Service":       "Pterodactyl",
-			"ContainerType": "server_process",
-		},
-	}
-
-	hostConf := &container.HostConfig{
-		PortBindings: d.portBindings(),
-
-		// Configure the mounts for this container. First mount the server data directory
-		// into the container as a r/w bind.
-		Mounts: []mount.Mount{
-			{
-				Target:   "/home/container",
-				Source:   d.Server.Filesystem.Path(),
-				Type:     mount.TypeBind,
-				ReadOnly: false,
-			},
-		},
-
-		// Configure the /tmp folder mapping in containers. This is necessary for some
-		// games that need to make use of it for downloads and other installation processes.
-		Tmpfs: map[string]string{
-			"/tmp": "rw,exec,nosuid,size=50M",
-		},
-
-		// Define resource limits for the container based on the data passed through
-		// from the Panel.
-		Resources: d.getResourcesForServer(),
-
-		DNS: config.Get().Docker.Network.Dns,
-
-		// Configure logging for the container to make it easier on the Daemon to grab
-		// the server output. Ensure that we don't use too much space on the host machine
-		// since we only need it for the last few hundred lines of output and don't care
-		// about anything else in it.
-		LogConfig: container.LogConfig{
-			Type: jsonfilelog.Name,
-			Config: map[string]string{
-				"max-size": "5m",
-				"max-file": "1",
-			},
-		},
-
-		SecurityOpt:    []string{"no-new-privileges"},
-		ReadonlyRootfs: true,
-		CapDrop: []string{
-			"setpcap", "mknod", "audit_write", "net_raw", "dac_override",
-			"fowner", "fsetid", "net_bind_service", "sys_chroot", "setfcap",
-		},
-		NetworkMode: "pterodactyl_nw",
-	}
-
-	// Pretty sure TZ=X in the environment variables negates the need for this
-	// to happen. Leaving it until I can confirm that works for everything.
-	//
-	// if err := mountTimezoneData(hostConf); err != nil {
-	// 	if os.IsNotExist(err) {
-	// 		zap.S().Warnw("the timezone data path configured does not exist on the system", zap.Error(errors.WithStack(err)))
-	// 	} else {
-	// 		zap.S().Warnw("failed to mount timezone data into container", zap.Error(errors.WithStack(err)))
-	// 	}
-	// }
-
-	if _, err := cli.ContainerCreate(ctx, conf, hostConf, nil, d.Server.Uuid); err != nil {
-		return errors.WithStack(err)
-	}
-
-	return nil
-}
-
-// Sends the specified command to the stdin of the running container instance. There is no
-// confirmation that this data is sent successfully, only that it gets pushed into the stdin.
-func (d *DockerEnvironment) SendCommand(c string) error {
-	if !d.attached {
-		return errors.New("attempting to send command to non-attached instance")
-	}
-
-	_, err := d.stream.Conn.Write([]byte(c + "\n"))
-
-	return errors.WithStack(err)
-}
-
-// Reads the log file for the server. This does not care if the server is running or not, it will
-// simply try to read the last X bytes of the file and return them.
-func (d *DockerEnvironment) Readlog(len int64) ([]string, error) {
-	ctx := context.Background()
-
-	j, err := d.Client.ContainerInspect(ctx, d.Server.Uuid)
-	if err != nil {
-		return nil, err
-	}
-
-	if j.LogPath == "" {
-		return nil, errors.New("empty log path defined for server")
-	}
-
-	f, err := os.Open(j.LogPath)
-	if err != nil {
-		return nil, err
-	}
-	defer f.Close()
-
-	// Check if the length of the file is smaller than the amount of data that was requested
-	// for reading. If so, adjust the length to be the total length of the file. If this is not
-	// done an error is thrown since we're reading backwards, and not forwards.
-	if stat, err := os.Stat(j.LogPath); err != nil {
-		return nil, err
-	} else if stat.Size() < len {
-		len = stat.Size()
-	}
-
-	// Seed to the end of the file and then move backwards until the length is met to avoid
-	// reading the entirety of the file into memory.
-	if _, err := f.Seek(-len, io.SeekEnd); err != nil {
-		return nil, err
-	}
-
-	b := make([]byte, len)
-
-	if _, err := f.Read(b); err != nil && err != io.EOF {
-		return nil, err
-	}
-
-	return d.parseLogToStrings(b)
-}
-
-type dockerLogLine struct {
-	Log string `json:"log"`
-}
-
-// Docker stores the logs for server output in a JSON format. This function will iterate over the JSON
-// that was read from the log file and parse it into a more human readable format.
-func (d *DockerEnvironment) parseLogToStrings(b []byte) ([]string, error) {
-	var hasError = false
-	var out []string
-
-	scanner := bufio.NewScanner(bytes.NewReader(b))
-	for scanner.Scan() {
-		var l dockerLogLine
-		// Unmarshal the contents and allow up to a single error before bailing out of the process. We
-		// do this because if you're arbitrarily reading a length of the file you'll likely end up
-		// with the first line in the output being improperly formatted JSON. In those cases we want to
-		// just skip over it. However if we see another error we're going to bail out because that is an
-		// abnormal situation.
-		if err := json.Unmarshal([]byte(scanner.Text()), &l); err != nil {
-			if hasError {
-				return nil, err
-			}
-
-			hasError = true
-			continue
-		}
-
-		out = append(out, l.Log)
-	}
-
-	return out, nil
-}
-
-// Returns the environment variables for a server in KEY="VALUE" form.
-func (d *DockerEnvironment) environmentVariables() []string {
-	zone, _ := time.Now().In(time.Local).Zone()
-
-	var out = []string{
-		fmt.Sprintf("TZ=%s", zone),
-		fmt.Sprintf("STARTUP=%s", d.Server.Invocation),
-		fmt.Sprintf("SERVER_MEMORY=%d", d.Server.Build.MemoryLimit),
-		fmt.Sprintf("SERVER_IP=%s", d.Server.Allocations.DefaultMapping.Ip),
-		fmt.Sprintf("SERVER_PORT=%d", d.Server.Allocations.DefaultMapping.Port),
-	}
-
-eloop:
-	for k, v := range d.Server.EnvVars {
-		for _, e := range out {
-			if strings.HasPrefix(e, strings.ToUpper(k)) {
-				continue eloop
-			}
-		}
-
-		out = append(out, fmt.Sprintf("%s=\"%s\"", strings.ToUpper(k), v))
-	}
-
-	return out
-}
-
-func (d *DockerEnvironment) volumes() map[string]struct{} {
-	return nil
-}
-
-// Converts the server allocation mappings into a format that can be understood
-// by Docker.
-func (d *DockerEnvironment) portBindings() nat.PortMap {
-	var out = nat.PortMap{}
-
-	for ip, ports := range d.Server.Allocations.Mappings {
-		for _, port := range ports {
-			// Skip over invalid ports.
-			if port < 0 || port > 65535 {
-				continue
-			}
-
-			binding := []nat.PortBinding{
-				{
-					HostIP:   ip,
-					HostPort: strconv.Itoa(port),
-				},
-			}
-
-			out[nat.Port(fmt.Sprintf("%d/tcp", port))] = binding
-			out[nat.Port(fmt.Sprintf("%d/udp", port))] = binding
-		}
-	}
-
-	return out
-}
-
-// Converts the server allocation mappings into a PortSet that can be understood
-// by Docker. This formatting is slightly different than portBindings as it should
-// return an empty struct rather than a binding.
-//
-// To accomplish this, we'll just get the values from portBindings and then set them
-// to empty structs. Because why not.
-func (d *DockerEnvironment) exposedPorts() nat.PortSet {
-	var out = nat.PortSet{}
-
-	for port := range d.portBindings() {
-		out[port] = struct{}{}
-	}
-
-	return out
-}
-
-// Formats the resources available to a server instance in such as way that Docker will
-// generate a matching environment in the container.
-func (d *DockerEnvironment) getResourcesForServer() container.Resources {
-	overhead := 1.05
-	// Set the hard limit for memory usage to be 5% more than the amount of memory assigned to
-	// the server. If the memory limit for the server is < 4G, use 10%, if less than 2G use
-	// 15%. This avoids unexpected crashes from processes like Java which run over the limit.
-	if d.Server.Build.MemoryLimit <= 2048 {
-		overhead = 1.15
-	} else if d.Server.Build.MemoryLimit  <= 4096 {
-		overhead = 1.10;
-	}
-
-	return container.Resources{
-		Memory:            int64(math.Round(float64(d.Server.Build.MemoryLimit) * 1000000.0 * overhead)),
-		MemoryReservation: d.Server.Build.MemoryLimit * 1000000,
-		MemorySwap:        d.Server.Build.ConvertedSwap(),
-		CPUQuota:          d.Server.Build.ConvertedCpuLimit(),
-		CPUPeriod:         100000,
-		CPUShares:         1024,
-		BlkioWeight:       d.Server.Build.IoWeight,
-		OomKillDisable:    &d.Server.Container.OomDisabled,
-		CpusetCpus:        d.Server.Build.Threads,
-	}
-}

server/errors.go

@@ -1,17 +1,15 @@
 package server
 
-type suspendedError struct {
-}
+import (
+	"emperror.dev/errors"
+)
 
-func (e *suspendedError) Error() string {
-	return "server is currently in a suspended state"
-}
-
-func IsSuspendedError(err error) bool {
-	_, ok := err.(*suspendedError)
-
-	return ok
-}
+var (
+	ErrIsRunning            = errors.New("server is running")
+	ErrSuspended            = errors.New("server is currently in a suspended state")
+	ErrServerIsInstalling   = errors.New("server is currently installing")
+	ErrServerIsTransferring = errors.New("server is currently being transferred")
+)
 
 type crashTooFrequent struct {
 }
@@ -37,4 +35,4 @@ func IsServerDoesNotExistError(err error) bool {
 	_, ok := err.(*serverDoesNotExist)
 
 	return ok
-}
+}

server/events.go

@@ -1,120 +1,32 @@
 package server
 
 import (
-	"encoding/json"
-	"strings"
-	"sync"
+	"github.com/pterodactyl/wings/events"
 )
 
 // Defines all of the possible output events for a server.
 // noinspection GoNameStartsWithPackageName
 const (
-	DaemonMessageEvent   = "daemon message"
-	InstallOutputEvent   = "install output"
-	ConsoleOutputEvent   = "console output"
-	StatusEvent          = "status"
-	StatsEvent           = "stats"
-	BackupCompletedEvent = "backup completed"
+	DaemonMessageEvent    = "daemon message"
+	InstallOutputEvent    = "install output"
+	InstallStartedEvent   = "install started"
+	InstallCompletedEvent = "install completed"
+	ConsoleOutputEvent    = "console output"
+	StatusEvent           = "status"
+	StatsEvent            = "stats"
+	BackupCompletedEvent  = "backup completed"
+	TransferLogsEvent     = "transfer logs"
+	TransferStatusEvent   = "transfer status"
 )
 
-type Event struct {
-	Data  string
-	Topic string
-}
-
-type EventBus struct {
-	sync.RWMutex
-
-	subscribers map[string][]chan Event
-}
-
 // Returns the server's emitter instance.
-func (s *Server) Events() *EventBus {
+func (s *Server) Events() *events.EventBus {
+	s.emitterLock.Lock()
+	defer s.emitterLock.Unlock()
+
 	if s.emitter == nil {
-		s.emitter = &EventBus{
-			subscribers: map[string][]chan Event{},
-		}
+		s.emitter = events.New()
 	}
 
 	return s.emitter
 }
-
-// Publish data to a given topic.
-func (e *EventBus) Publish(topic string, data string) {
-	e.RLock()
-	defer e.RUnlock()
-
-	t := topic
-	// Some of our topics for the socket support passing a more specific namespace,
-	// such as "backup completed:1234" to indicate which specific backup was completed.
-	//
-	// In these cases, we still need to the send the event using the standard listener
-	// name of "backup completed".
-	if strings.Contains(topic, ":") {
-		parts := strings.SplitN(topic, ":", 2)
-
-		if len(parts) == 2 {
-			t = parts[0]
-		}
-	}
-
-	if ch, ok := e.subscribers[t]; ok {
-		go func(data Event, cs []chan Event) {
-			for _, channel := range cs {
-				channel <- data
-			}
-		}(Event{Data: data, Topic: topic}, ch)
-	}
-}
-
-func (e *EventBus) PublishJson(topic string, data interface{}) error {
-	b, err := json.Marshal(data)
-	if err != nil {
-		return err
-	}
-
-	e.Publish(topic, string(b))
-
-	return nil
-}
-
-// Subscribe to an emitter topic using a channel.
-func (e *EventBus) Subscribe(topic string, ch chan Event) {
-	e.Lock()
-	defer e.Unlock()
-
-	if p, ok := e.subscribers[topic]; ok {
-		e.subscribers[topic] = append(p, ch)
-	} else {
-		e.subscribers[topic] = append([]chan Event{}, ch)
-	}
-}
-
-// Unsubscribe a channel from a topic.
-func (e *EventBus) Unsubscribe(topic string, ch chan Event) {
-	e.Lock()
-	defer e.Unlock()
-
-	if _, ok := e.subscribers[topic]; ok {
-		for i := range e.subscribers[topic] {
-			if ch == e.subscribers[topic][i] {
-				e.subscribers[topic] = append(e.subscribers[topic][:i], e.subscribers[topic][i+1:]...)
-			}
-		}
-	}
-}
-
-// Removes all of the event listeners for the server. This is used when a server
-// is being deleted to avoid a bunch of de-reference errors cropping up. Obviously
-// should also check elsewhere and handle a server reference going nil, but this
-// won't hurt.
-func (e *EventBus) UnsubscribeAll() {
-	e.Lock()
-	defer e.Unlock()
-
-	// Loop over all of the subscribers and just remove all of the events
-	// for them.
-	for t := range e.subscribers {
-		e.subscribers[t] = make([]chan Event, 0)
-	}
-}

server/filesystem.go

@@ -1,605 +1,29 @@
 package server
 
 import (
-	"bufio"
-	"bytes"
-	"context"
-	"encoding/json"
-	"fmt"
-	"github.com/gabriel-vasile/mimetype"
-	"github.com/pkg/errors"
-	"github.com/pterodactyl/wings/config"
-	"github.com/pterodactyl/wings/server/backup"
-	ignore "github.com/sabhiram/go-gitignore"
-	"go.uber.org/zap"
-	"io"
-	"io/ioutil"
+	"github.com/pterodactyl/wings/server/filesystem"
 	"os"
-	"path"
-	"path/filepath"
-	"sort"
-	"strconv"
-	"strings"
-	"sync"
-	"sync/atomic"
-	"time"
 )
 
-// Error returned when there is a bad path provided to one of the FS calls.
-var InvalidPathResolution = errors.New("invalid path resolution")
-
-type Filesystem struct {
-	// The server object associated with this Filesystem.
-	Server *Server
-
-	Configuration *config.SystemConfiguration
-}
-
-// Returns the root path that contains all of a server's data.
-func (fs *Filesystem) Path() string {
-	return filepath.Join(fs.Configuration.Data, fs.Server.Uuid)
-}
-
-// Normalizes a directory being passed in to ensure the user is not able to escape
-// from their data directory. After normalization if the directory is still within their home
-// path it is returned. If they managed to "escape" an error will be returned.
-//
-// This logic is actually copied over from the SFTP server code. Ideally that eventually
-// either gets ported into this application, or is able to make use of this package.
-func (fs *Filesystem) SafePath(p string) (string, error) {
-	var nonExistentPathResolution string
-
-	// Calling filpath.Clean on the joined directory will resolve it to the absolute path,
-	// removing any ../ type of resolution arguments, and leaving us with a direct path link.
-	//
-	// This will also trim the existing root path off the beginning of the path passed to
-	// the function since that can get a bit messy.
-	r := filepath.Clean(filepath.Join(fs.Path(), strings.TrimPrefix(p, fs.Path())))
-
-	// At the same time, evaluate the symlink status and determine where this file or folder
-	// is truly pointing to.
-	p, err := filepath.EvalSymlinks(r)
-	if err != nil && !os.IsNotExist(err) {
-		return "", err
-	} else if os.IsNotExist(err) {
-		// The requested directory doesn't exist, so at this point we need to iterate up the
-		// path chain until we hit a directory that _does_ exist and can be validated.
-		parts := strings.Split(filepath.Dir(r), "/")
-
-		var try string
-		// Range over all of the path parts and form directory pathings from the end
-		// moving up until we have a valid resolution or we run out of paths to try.
-		for k := range parts {
-			try = strings.Join(parts[:(len(parts)-k)], "/")
-
-			if !strings.HasPrefix(try, fs.Path()) {
-				break
-			}
-
-			t, err := filepath.EvalSymlinks(try)
-			if err == nil {
-				nonExistentPathResolution = t
-				break
-			}
-		}
-	}
-
-	// If the new path doesn't start with their root directory there is clearly an escape
-	// attempt going on, and we should NOT resolve this path for them.
-	if nonExistentPathResolution != "" {
-		if !strings.HasPrefix(nonExistentPathResolution, fs.Path()) {
-			return "", InvalidPathResolution
-		}
-
-		// If the nonExistentPathResolution variable is not empty then the initial path requested
-		// did not exist and we looped through the pathway until we found a match. At this point
-		// we've confirmed the first matched pathway exists in the root server directory, so we
-		// can go ahead and just return the path that was requested initially.
-		return r, nil
-	}
-
-	// If the requested directory from EvalSymlinks begins with the server root directory go
-	// ahead and return it. If not we'll return an error which will block any further action
-	// on the file.
-	if strings.HasPrefix(p, fs.Path()) {
-		return p, nil
-	}
-
-	return "", InvalidPathResolution
-}
-
-// Determines if the directory a file is trying to be added to has enough space available
-// for the file to be written to.
-//
-// Because determining the amount of space being used by a server is a taxing operation we
-// will load it all up into a cache and pull from that as long as the key is not expired.
-func (fs *Filesystem) HasSpaceAvailable() bool {
-	var space = fs.Server.Build.DiskSpace
-
-	// If space is -1 or 0 just return true, means they're allowed unlimited.
-	if space <= 0 {
-		return true
-	}
-
-	// If we have a match in the cache, use that value in the return. No need to perform an expensive
-	// disk operation, even if this is an empty value.
-	if x, exists := fs.Server.Cache.Get("disk_used"); exists {
-		fs.Server.Resources.Disk = x.(int64)
-		return (x.(int64) / 1000.0 / 1000.0) <= space
-	}
-
-	// If there is no size its either because there is no data (in which case running this function
-	// will have effectively no impact), or there is nothing in the cache, in which case we need to
-	// grab the size of their data directory. This is a taxing operation, so we want to store it in
-	// the cache once we've gotten it.
-	size, err := fs.DirectorySize("/")
-	if err != nil {
-		zap.S().Warnw("failed to determine directory size", zap.String("server", fs.Server.Uuid), zap.Error(err))
-	}
-
-	// Always cache the size, even if there is an error. We want to always return that value
-	// so that we don't cause an endless loop of determining the disk size if there is a temporary
-	// error encountered.
-	fs.Server.Cache.Set("disk_used", size, time.Second*60)
-
-	// Determine if their folder size, in bytes, is smaller than the amount of space they've
-	// been allocated.
-	fs.Server.Resources.Disk = size
-
-	return (size / 1000.0 / 1000.0) <= space
-}
-
-// Determines the directory size of a given location by running parallel tasks to iterate
-// through all of the folders. Returns the size in bytes. This can be a fairly taxing operation
-// on locations with tons of files, so it is recommended that you cache the output.
-func (fs *Filesystem) DirectorySize(dir string) (int64, error) {
-	w := fs.NewWalker()
-	ctx := context.Background()
-
-	var size int64
-	err := w.Walk(dir, ctx, func(f os.FileInfo, _ string) bool {
-		// Only increment the size when we're dealing with a file specifically, otherwise
-		// just continue digging deeper until there are no more directories to iterate over.
-		if !f.IsDir() {
-			atomic.AddInt64(&size, f.Size())
-		}
-		return true
-	})
-
-	return size, err
-}
-
-// Reads a file on the system and returns it as a byte representation in a file
-// reader. This is not the most memory efficient usage since it will be reading the
-// entirety of the file into memory.
-func (fs *Filesystem) Readfile(p string) (io.Reader, error) {
-	cleaned, err := fs.SafePath(p)
-	if err != nil {
-		return nil, err
-	}
-
-	b, err := ioutil.ReadFile(cleaned)
-	if err != nil {
-		return nil, err
-	}
-
-	return bytes.NewReader(b), nil
-}
-
-// Writes a file to the system. If the file does not already exist one will be created.
-//
-// @todo should probably have a write lock here so we don't write twice at once.
-func (fs *Filesystem) Writefile(p string, r io.Reader) error {
-	cleaned, err := fs.SafePath(p)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	// If the file does not exist on the system already go ahead and create the pathway
-	// to it and an empty file. We'll then write to it later on after this completes.
-	if stat, err := os.Stat(cleaned); err != nil && os.IsNotExist(err) {
-		if err := os.MkdirAll(filepath.Dir(cleaned), 0755); err != nil {
-			return errors.WithStack(err)
-		}
-
-		if err := fs.Chown(filepath.Dir(cleaned)); err != nil {
-			return errors.WithStack(err)
-		}
-	} else if err != nil {
-		return errors.WithStack(err)
-	} else if stat.IsDir() {
-		return errors.New("cannot use a directory as a file for writing")
-	}
-
-	// This will either create the file if it does not already exist, or open and
-	// truncate the existing file.
-	file, err := os.OpenFile(cleaned, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	defer file.Close()
-
-	// Create a new buffered writer that will write to the file we just opened
-	// and stream in the contents from the reader.
-	w := bufio.NewWriter(file)
-
-	buf := make([]byte, 1024)
-	for {
-		n, err := r.Read(buf)
-		if err != nil && err != io.EOF {
-			return errors.WithStack(err)
-		}
-
-		if n == 0 {
-			break
-		}
-
-		if _, err := w.Write(buf[:n]); err != nil {
-			return errors.WithStack(err)
-		}
-	}
-
-	if err := w.Flush(); err != nil {
-		return errors.WithStack(err)
-	}
-
-	// Finally, chown the file to ensure the permissions don't end up out-of-whack
-	// if we had just created it.
-	return fs.Chown(p)
-}
-
-// Defines the stat struct object.
-type Stat struct {
-	Info     os.FileInfo
-	Mimetype string
-}
-
-func (s *Stat) MarshalJSON() ([]byte, error) {
-	return json.Marshal(struct {
-		Name      string `json:"name"`
-		Created   string `json:"created"`
-		Modified  string `json:"modified"`
-		Mode      string `json:"mode"`
-		Size      int64  `json:"size"`
-		Directory bool   `json:"directory"`
-		File      bool   `json:"file"`
-		Symlink   bool   `json:"symlink"`
-		Mime      string `json:"mime"`
-	}{
-		Name:      s.Info.Name(),
-		Created:   s.CTime().Format(time.RFC3339),
-		Modified:  s.Info.ModTime().Format(time.RFC3339),
-		Mode:      s.Info.Mode().String(),
-		Size:      s.Info.Size(),
-		Directory: s.Info.IsDir(),
-		File:      !s.Info.IsDir(),
-		Symlink:   s.Info.Mode().Perm()&os.ModeSymlink != 0,
-		Mime:      s.Mimetype,
-	})
-}
-
-// Stats a file or folder and returns the base stat object from go along with the
-// MIME data that can be used for editing files.
-func (fs *Filesystem) Stat(p string) (*Stat, error) {
-	cleaned, err := fs.SafePath(p)
-	if err != nil {
-		return nil, err
-	}
-
-	return fs.unsafeStat(cleaned)
-}
-
-func (fs *Filesystem) unsafeStat(p string) (*Stat, error) {
-	s, err := os.Stat(p)
-	if err != nil {
-		return nil, err
-	}
-
-	var m = "inode/directory"
-	if !s.IsDir() {
-		m, _, err = mimetype.DetectFile(p)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	st := &Stat{
-		Info:     s,
-		Mimetype: m,
-	}
-
-	return st, nil
-}
-
-// Creates a new directory (name) at a specificied path (p) for the server.
-func (fs *Filesystem) CreateDirectory(name string, p string) error {
-	cleaned, err := fs.SafePath(path.Join(p, name))
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	return os.MkdirAll(cleaned, 0755)
-}
-
-// Moves (or renames) a file or directory.
-func (fs *Filesystem) Rename(from string, to string) error {
-	cleanedFrom, err := fs.SafePath(from)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	cleanedTo, err := fs.SafePath(to)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	return os.Rename(cleanedFrom, cleanedTo)
-}
-
-// Recursively iterates over a directory and sets the permissions on all of the
-// underlying files.
-func (fs *Filesystem) Chown(path string) error {
-	cleaned, err := fs.SafePath(path)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	if s, err := os.Stat(cleaned); err != nil {
-		return errors.WithStack(err)
-	} else if !s.IsDir() {
-		return os.Chown(cleaned, fs.Configuration.User.Uid, fs.Configuration.User.Gid)
-	}
-
-	return fs.chownDirectory(cleaned)
-}
-
-// Iterate over all of the files and directories. If it is a file just go ahead and perform
-// the chown operation. Otherwise dig deeper into the directory until we've run out of
-// directories to dig into.
-func (fs *Filesystem) chownDirectory(path string) error {
-	var wg sync.WaitGroup
-
-	cleaned, err := fs.SafePath(path)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	// Chown the directory itself.
-	os.Chown(cleaned, config.Get().System.User.Uid, config.Get().System.User.Gid)
-
-	files, err := ioutil.ReadDir(cleaned)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	for _, f := range files {
-		if f.IsDir() {
-			wg.Add(1)
-
-			go func(p string) {
-				defer wg.Done()
-				fs.chownDirectory(p)
-			}(filepath.Join(cleaned, f.Name()))
-		} else {
-			// Chown the file.
-			os.Chown(filepath.Join(cleaned, f.Name()), fs.Configuration.User.Uid, fs.Configuration.User.Gid)
-		}
-	}
-
-	wg.Wait()
-
-	return nil
-}
-
-// Copies a given file to the same location and appends a suffix to the file to indicate that
-// it has been copied.
-//
-// @todo need to get an exclusive lock on the file.
-func (fs *Filesystem) Copy(p string) error {
-	cleaned, err := fs.SafePath(p)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	if s, err := os.Stat(cleaned); (err != nil && os.IsNotExist(err)) || s.IsDir() || !s.Mode().IsRegular() {
-		// For now I think I am okay just returning a nil response if the thing
-		// we're trying to copy doesn't exist. Probably will want to come back and
-		// re-evaluate if this is a smart decision (I'm guessing not).
-		return nil
-	} else if err != nil {
-		return errors.WithStack(err)
-	}
-
-	base := filepath.Base(cleaned)
-	relative := strings.TrimSuffix(strings.TrimPrefix(cleaned, fs.Path()), base)
-	extension := filepath.Ext(base)
-	name := strings.TrimSuffix(base, filepath.Ext(base))
-
-	// Begin looping up to 50 times to try and create a unique copy file name. This will take
-	// an input of "file.txt" and generate "file copy.txt". If that name is already taken, it will
-	// then try to write "file copy 2.txt" and so on, until reaching 50 loops. At that point we
-	// won't waste anymore time, just use the current timestamp and make that copy.
-	//
-	// Could probably make this more efficient by checking if there are any files matching the copy
-	// pattern, and trying to find the highest number and then incrementing it by one rather than
-	// looping endlessly.
-	var i int
-	copySuffix := " copy"
-	for i = 0; i < 51; i++ {
-		if i > 0 {
-			copySuffix = " copy " + strconv.Itoa(i)
-		}
-
-		tryName := fmt.Sprintf("%s%s%s", name, copySuffix, extension)
-		tryLocation, err := fs.SafePath(path.Join(relative, tryName))
-		if err != nil {
-			return errors.WithStack(err)
-		}
-
-		// If the file exists, continue to the next loop, otherwise we're good to start a copy.
-		if _, err := os.Stat(tryLocation); err != nil && !os.IsNotExist(err) {
-			return errors.WithStack(err)
-		} else if os.IsNotExist(err) {
-			break
-		}
-
-		if i == 50 {
-			copySuffix = "." + time.Now().Format(time.RFC3339)
-		}
-	}
-
-	finalPath, err := fs.SafePath(path.Join(relative, fmt.Sprintf("%s%s%s", name, copySuffix, extension)))
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	source, err := os.Open(cleaned)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	defer source.Close()
-
-	dest, err := os.Create(finalPath)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	defer dest.Close()
-
-	if _, err := io.Copy(dest, source); err != nil {
-		return errors.WithStack(err)
-	}
-
-	return nil
-}
-
-// Deletes a file or folder from the system. Prevents the user from accidentally
-// (or maliciously) removing their root server data directory.
-func (fs *Filesystem) Delete(p string) error {
-	cleaned, err := fs.SafePath(p)
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	// Block any whoopsies.
-	if cleaned == fs.Path() {
-		return errors.New("cannot delete root server directory")
-	}
-
-	return os.RemoveAll(cleaned)
-}
-
-// Lists the contents of a given directory and returns stat information about each
-// file and folder within it.
-func (fs *Filesystem) ListDirectory(p string) ([]*Stat, error) {
-	cleaned, err := fs.SafePath(p)
-	if err != nil {
-		return nil, err
-	}
-
-	files, err := ioutil.ReadDir(cleaned)
-	if err != nil {
-		return nil, err
-	}
-
-	var wg sync.WaitGroup
-
-	// You must initialize the output of this directory as a non-nil value otherwise
-	// when it is marshaled into a JSON object you'll just get 'null' back, which will
-	// break the panel badly.
-	out := make([]*Stat, len(files))
-
-	// Iterate over all of the files and directories returned and perform an async process
-	// to get the mime-type for them all.
-	for i, file := range files {
-		wg.Add(1)
-
-		go func(idx int, f os.FileInfo) {
-			defer wg.Done()
-
-			var m = "inode/directory"
-			if !f.IsDir() {
-				m, _, _ = mimetype.DetectFile(filepath.Join(cleaned, f.Name()))
-			}
-
-			out[idx] = &Stat{
-				Info:     f,
-				Mimetype: m,
-			}
-		}(i, file)
-	}
-
-	wg.Wait()
-
-	// Sort the output alphabetically to begin with since we've run the output
-	// through an asynchronous process and the order is gonna be very random.
-	sort.SliceStable(out, func(i, j int) bool {
-		if out[i].Info.Name() == out[j].Info.Name() || out[i].Info.Name() > out[j].Info.Name() {
-			return true
-		}
-
-		return false
-	})
-
-	// Then, sort it so that directories are listed first in the output. Everything
-	// will continue to be alphabetized at this point.
-	sort.SliceStable(out, func(i, j int) bool {
-		return out[i].Info.IsDir()
-	})
-
-	return out, nil
+func (s *Server) Filesystem() *filesystem.Filesystem {
+	return s.fs
 }
 
 // Ensures that the data directory for the server instance exists.
-func (fs *Filesystem) EnsureDataDirectory() error {
-	if _, err := os.Stat(fs.Path()); err != nil && !os.IsNotExist(err) {
-		return errors.WithStack(err)
+func (s *Server) EnsureDataDirectoryExists() error {
+	if _, err := os.Stat(s.fs.Path()); err != nil && !os.IsNotExist(err) {
+		return err
 	} else if err != nil {
 		// Create the server data directory because it does not currently exist
 		// on the system.
-		if err := os.MkdirAll(fs.Path(), 0700); err != nil {
-			return errors.WithStack(err)
+		if err := os.MkdirAll(s.fs.Path(), 0700); err != nil {
+			return err
+		}
+
+		if err := s.fs.Chown("/"); err != nil {
+			s.Log().WithField("error", err).Warn("failed to chown server data directory")
 		}
 	}
 
 	return nil
 }
-
-// Given a directory, iterate through all of the files and folders within it and determine
-// if they should be included in the output based on an array of ignored matches. This uses
-// standard .gitignore formatting to make that determination.
-//
-// If no ignored files are passed through you'll get the entire directory listing.
-func (fs *Filesystem) GetIncludedFiles(dir string, ignored []string) (*backup.IncludedFiles, error) {
-	cleaned, err := fs.SafePath(dir)
-	if err != nil {
-		return nil, err
-	}
-
-	w := fs.NewWalker()
-	ctx := context.Background()
-
-	i, err := ignore.CompileIgnoreLines(ignored...)
-	if err != nil {
-		return nil, err
-	}
-
-	// Walk through all of the files and directories on a server. This callback only returns
-	// files found, and will keep walking deeper and deeper into directories.
-	inc := new(backup.IncludedFiles)
-	if err := w.Walk(cleaned, ctx, func(f os.FileInfo, p string) bool {
-		// Avoid unnecessary parsing if there are no ignored files, nothing will match anyways
-		// so no reason to call the function.
-		if len(ignored) == 0 || !i.MatchesPath(strings.TrimPrefix(p, fs.Path() + "/")) {
-			inc.Push(&f, p)
-		}
-
-		// We can't just abort if the path is technically ignored. It is possible there is a nested
-		// file or folder that should not be excluded, so in this case we need to just keep going
-		// until we get to a final state.
-		return true
-	}); err != nil {
-		return nil, err
-	}
-
-	return inc, nil
-}

server/filesystem/archive.go

@@ -0,0 +1,224 @@
+package filesystem
+
+import (
+	"archive/tar"
+	"emperror.dev/errors"
+	"github.com/apex/log"
+	"github.com/juju/ratelimit"
+	"github.com/karrick/godirwalk"
+	"github.com/klauspost/pgzip"
+	"github.com/pterodactyl/wings/config"
+	"github.com/sabhiram/go-gitignore"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+)
+
+const memory = 4 * 1024
+
+var pool = sync.Pool{
+	New: func() interface{} {
+		b := make([]byte, memory)
+		return b
+	},
+}
+
+type Archive struct {
+	// BasePath is the absolute path to create the archive from where Files and Ignore are
+	// relative to.
+	BasePath string
+
+	// Ignore is a gitignore string (most likely read from a file) of files to ignore
+	// from the archive.
+	Ignore string
+
+	// Files specifies the files to archive, this takes priority over the Ignore option, if
+	// unspecified, all files in the BasePath will be archived unless Ignore is set.
+	Files []string
+}
+
+// Creates an archive at dst with all of the files defined in the included files struct.
+func (a *Archive) Create(dst string) error {
+	f, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	// Select a writer based off of the WriteLimit configuration option. If there is no
+	// write limit, use the file as the writer.
+	var writer io.Writer
+	if writeLimit := int64(config.Get().System.Backups.WriteLimit * 1024 * 1024); writeLimit > 0 {
+		// Token bucket with a capacity of "writeLimit" MiB, adding "writeLimit" MiB/s
+		// and then wrap the file writer with the token bucket limiter.
+		writer = ratelimit.Writer(f, ratelimit.NewBucketWithRate(float64(writeLimit), writeLimit))
+	} else {
+		writer = f
+	}
+
+	// Create a new gzip writer around the file.
+	gw, _ := pgzip.NewWriterLevel(writer, pgzip.BestSpeed)
+	_ = gw.SetConcurrency(1<<20, 1)
+	defer gw.Close()
+
+	// Create a new tar writer around the gzip writer.
+	tw := tar.NewWriter(gw)
+	defer tw.Close()
+
+	// Configure godirwalk.
+	options := &godirwalk.Options{
+		FollowSymbolicLinks: false,
+		Unsorted:            true,
+		Callback:            a.callback(tw),
+	}
+
+	// If we're specifically looking for only certain files, or have requested
+	// that certain files be ignored we'll update the callback function to reflect
+	// that request.
+	if len(a.Files) == 0 && len(a.Ignore) > 0 {
+		i := ignore.CompileIgnoreLines(strings.Split(a.Ignore, "\n")...)
+
+		options.Callback = a.callback(tw, func(_ string, rp string) error {
+			if i.MatchesPath(rp) {
+				return godirwalk.SkipThis
+			}
+
+			return nil
+		})
+	} else if len(a.Files) > 0 {
+		options.Callback = a.withFilesCallback(tw)
+	}
+
+	// Recursively walk the path we are archiving.
+	return godirwalk.Walk(a.BasePath, options)
+}
+
+// Callback function used to determine if a given file should be included in the archive
+// being generated.
+func (a *Archive) callback(tw *tar.Writer, opts ...func(path string, relative string) error) func(path string, de *godirwalk.Dirent) error {
+	return func(path string, de *godirwalk.Dirent) error {
+		// Skip directories because we walking them recursively.
+		if de.IsDir() {
+			return nil
+		}
+
+		relative := filepath.ToSlash(strings.TrimPrefix(path, a.BasePath+string(filepath.Separator)))
+
+		// Call the additional options passed to this callback function. If any of them return
+		// a non-nil error we will exit immediately.
+		for _, opt := range opts {
+			if err := opt(path, relative); err != nil {
+				return err
+			}
+		}
+
+		// Add the file to the archive, if it is nested in a directory,
+		// the directory will be automatically "created" in the archive.
+		return a.addToArchive(path, relative, tw)
+	}
+}
+
+// Pushes only files defined in the Files key to the final archive.
+func (a *Archive) withFilesCallback(tw *tar.Writer) func(path string, de *godirwalk.Dirent) error {
+	return a.callback(tw, func(p string, rp string) error {
+		for _, f := range a.Files {
+			// If the given doesn't match, or doesn't have the same prefix continue
+			// to the next item in the loop.
+			if p != f && !strings.HasPrefix(p, f) {
+				continue
+			}
+
+			// Once we have a match return a nil value here so that the loop stops and the
+			// call to this function will correctly include the file in the archive. If there
+			// are no matches we'll never make it to this line, and the final error returned
+			// will be the godirwalk.SkipThis error.
+			return nil
+		}
+
+		return godirwalk.SkipThis
+	})
+}
+
+// Adds a given file path to the final archive being created.
+func (a *Archive) addToArchive(p string, rp string, w *tar.Writer) error {
+	// Lstat the file, this will give us the same information as Stat except that it will not
+	// follow a symlink to it's target automatically. This is important to avoid including
+	// files that exist outside the server root unintentionally in the backup.
+	s, err := os.Lstat(p)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
+		return errors.WrapIff(err, "failed executing os.Lstat on '%s'", rp)
+	}
+
+	// Resolve the symlink target if the file is a symlink.
+	var target string
+	if s.Mode()&os.ModeSymlink != 0 {
+		// Read the target of the symlink. If there are any errors we will dump them out to
+		// the logs, but we're not going to stop the backup. There are far too many cases of
+		// symlinks causing all sorts of unnecessary pain in this process. Sucks to suck if
+		// it doesn't work.
+		target, err = os.Readlink(s.Name())
+		if err != nil {
+			// Ignore the not exist errors specifically, since theres nothing important about that.
+			if !os.IsNotExist(err) {
+				log.WithField("path", rp).WithField("readlink_err", err.Error()).Warn("failed reading symlink for target path; skipping...")
+			}
+			return nil
+		}
+	}
+
+	// Get the tar FileInfoHeader in order to add the file to the archive.
+	header, err := tar.FileInfoHeader(s, filepath.ToSlash(target))
+	if err != nil {
+		return errors.WrapIff(err, "failed to get tar#FileInfoHeader for '%s'", rp)
+	}
+
+	// Fix the header name if the file is not a symlink.
+	if s.Mode()&os.ModeSymlink == 0 {
+		header.Name = rp
+	}
+
+	// Write the tar FileInfoHeader to the archive.
+	if err := w.WriteHeader(header); err != nil {
+		return errors.WrapIff(err, "failed to write tar#FileInfoHeader for '%s'", rp)
+	}
+
+	// If the size of the file is less than 1 (most likely for symlinks), skip writing the file.
+	if header.Size < 1 {
+		return nil
+	}
+
+	// If the buffer size is larger than the file size, create a smaller buffer to hold the file.
+	var buf []byte
+	if header.Size < memory {
+		buf = make([]byte, header.Size)
+	} else {
+		// Get a fixed-size buffer from the pool to save on allocations.
+		buf = pool.Get().([]byte)
+		defer func() {
+			buf = make([]byte, memory)
+			pool.Put(buf)
+		}()
+	}
+
+	// Open the file.
+	f, err := os.Open(p)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
+		return errors.WrapIff(err, "failed to open '%s' for copying", header.Name)
+	}
+	defer f.Close()
+
+	// Copy the file's contents to the archive using our buffer.
+	if _, err := io.CopyBuffer(w, io.LimitReader(f, header.Size), buf); err != nil {
+		return errors.WrapIff(err, "failed to copy '%s' to archive", header.Name)
+	}
+
+	return nil
+}

server/filesystem/compress.go

@@ -0,0 +1,59 @@
+package filesystem
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+// Compresses all of the files matching the given paths in the specified directory. This function
+// also supports passing nested paths to only compress certain files and folders when working in
+// a larger directory. This effectively creates a local backup, but rather than ignoring specific
+// files and folders, it takes an allow-list of files and folders.
+//
+// All paths are relative to the dir that is passed in as the first argument, and the compressed
+// file will be placed at that location named `archive-{date}.tar.gz`.
+func (fs *Filesystem) CompressFiles(dir string, paths []string) (os.FileInfo, error) {
+	cleanedRootDir, err := fs.SafePath(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	// Take all of the paths passed in and merge them together with the root directory we've gotten.
+	for i, p := range paths {
+		paths[i] = filepath.Join(cleanedRootDir, p)
+	}
+
+	cleaned, err := fs.ParallelSafePath(paths)
+	if err != nil {
+		return nil, err
+	}
+
+	a := &Archive{BasePath: cleanedRootDir, Files: cleaned}
+	d := path.Join(
+		cleanedRootDir,
+		fmt.Sprintf("archive-%s.tar.gz", strings.ReplaceAll(time.Now().Format(time.RFC3339), ":", "")),
+	)
+
+	if err := a.Create(d); err != nil {
+		return nil, err
+	}
+
+	f, err := os.Stat(d)
+	if err != nil {
+		_ = os.Remove(d)
+		return nil, err
+	}
+
+	if err := fs.HasSpaceFor(f.Size()); err != nil {
+		_ = os.Remove(d)
+		return nil, err
+	}
+
+	fs.addDisk(f.Size())
+
+	return f, nil
+}

server/filesystem/decompress.go

@@ -0,0 +1,110 @@
+package filesystem
+
+import (
+	"archive/tar"
+	"archive/zip"
+	"compress/gzip"
+	"emperror.dev/errors"
+	"fmt"
+	"github.com/mholt/archiver/v3"
+	"os"
+	"path/filepath"
+	"reflect"
+	"strings"
+	"sync/atomic"
+)
+
+// Look through a given archive and determine if decompressing it would put the server over
+// its allocated disk space limit.
+func (fs *Filesystem) SpaceAvailableForDecompression(dir string, file string) (bool, error) {
+	// Don't waste time trying to determine this if we know the server will have the space for
+	// it since there is no limit.
+	if fs.MaxDisk() <= 0 {
+		return true, nil
+	}
+
+	source, err := fs.SafePath(filepath.Join(dir, file))
+	if err != nil {
+		return false, err
+	}
+
+	// Get the cached size in a parallel process so that if it is not cached we are not
+	// waiting an unnecessary amount of time on this call.
+	dirSize, err := fs.DiskUsage(false)
+
+	var size int64
+	// Walk over the archive and figure out just how large the final output would be from unarchiving it.
+	err = archiver.Walk(source, func(f archiver.File) error {
+		if atomic.AddInt64(&size, f.Size())+dirSize > fs.MaxDisk() {
+			return &Error{code: ErrCodeDiskSpace}
+		}
+
+		return nil
+	})
+
+	if err != nil {
+		if strings.HasPrefix(err.Error(), "format ") {
+			return false, &Error{code: ErrCodeUnknownArchive}
+		}
+
+		return false, err
+	}
+
+	return true, err
+}
+
+// Decompress a file in a given directory by using the archiver tool to infer the file
+// type and go from there. This will walk over all of the files within the given archive
+// and ensure that there is not a zip-slip attack being attempted by validating that the
+// final path is within the server data directory.
+func (fs *Filesystem) DecompressFile(dir string, file string) error {
+	source, err := fs.SafePath(filepath.Join(dir, file))
+	if err != nil {
+		return err
+	}
+
+	// Make sure the file exists basically.
+	if _, err := os.Stat(source); err != nil {
+		return err
+	}
+
+	// Walk over all of the files spinning up an additional go-routine for each file we've encountered
+	// and then extract that file from the archive and write it to the disk. If any part of this process
+	// encounters an error the entire process will be stopped.
+	err = archiver.Walk(source, func(f archiver.File) error {
+		// Don't waste time with directories, we don't need to create them if they have no contents, and
+		// we will ensure the directory exists when opening the file for writing anyways.
+		if f.IsDir() {
+			return nil
+		}
+
+		var name string
+
+		switch s := f.Sys().(type) {
+		case *tar.Header:
+			name = s.Name
+		case *gzip.Header:
+			name = s.Name
+		case *zip.FileHeader:
+			name = s.Name
+		default:
+			return errors.New(fmt.Sprintf("could not parse underlying data source with type %s", reflect.TypeOf(s).String()))
+		}
+
+		p, err := fs.SafePath(filepath.Join(dir, name))
+		if err != nil {
+			return errors.WithMessage(err, "failed to generate a safe path to server file")
+		}
+
+		return errors.WithMessage(fs.Writefile(p, f), "could not extract file from archive")
+	})
+	if err != nil {
+		if strings.HasPrefix(err.Error(), "format ") {
+			return &Error{code: ErrCodeUnknownArchive}
+		}
+
+		return err
+	}
+
+	return nil
+}

server/filesystem/disk_space.go

@@ -0,0 +1,237 @@
+package filesystem
+
+import (
+	"github.com/apex/log"
+	"github.com/karrick/godirwalk"
+	"sync"
+	"sync/atomic"
+	"syscall"
+	"time"
+)
+
+type SpaceCheckingOpts struct {
+	AllowStaleResponse bool
+}
+
+type usageLookupTime struct {
+	sync.RWMutex
+	value time.Time
+}
+
+// Update the last time that a disk space lookup was performed.
+func (ult *usageLookupTime) Set(t time.Time) {
+	ult.Lock()
+	ult.value = t
+	ult.Unlock()
+}
+
+// Get the last time that we performed a disk space usage lookup.
+func (ult *usageLookupTime) Get() time.Time {
+	ult.RLock()
+	defer ult.RUnlock()
+
+	return ult.value
+}
+
+// Returns the maximum amount of disk space that this Filesystem instance is allowed to use.
+func (fs *Filesystem) MaxDisk() int64 {
+	return atomic.LoadInt64(&fs.diskLimit)
+}
+
+// Sets the disk space limit for this Filesystem instance.
+func (fs *Filesystem) SetDiskLimit(i int64) {
+	atomic.SwapInt64(&fs.diskLimit, i)
+}
+
+// The same concept as HasSpaceAvailable however this will return an error if there is
+// no space, rather than a boolean value.
+func (fs *Filesystem) HasSpaceErr(allowStaleValue bool) error {
+	if !fs.HasSpaceAvailable(allowStaleValue) {
+		return &Error{code: ErrCodeDiskSpace}
+	}
+	return nil
+}
+
+// Determines if the directory a file is trying to be added to has enough space available
+// for the file to be written to.
+//
+// Because determining the amount of space being used by a server is a taxing operation we
+// will load it all up into a cache and pull from that as long as the key is not expired.
+//
+// This operation will potentially block unless allowStaleValue is set to true. See the
+// documentation on DiskUsage for how this affects the call.
+func (fs *Filesystem) HasSpaceAvailable(allowStaleValue bool) bool {
+	size, err := fs.DiskUsage(allowStaleValue)
+	if err != nil {
+		log.WithField("root", fs.root).WithField("error", err).Warn("failed to determine root fs directory size")
+	}
+
+	// If space is -1 or 0 just return true, means they're allowed unlimited.
+	//
+	// Technically we could skip disk space calculation because we don't need to check if the
+	// server exceeds it's limit but because this method caches the disk usage it would be best
+	// to calculate the disk usage and always return true.
+	if fs.MaxDisk() == 0 {
+		return true
+	}
+
+	return size <= fs.MaxDisk()
+}
+
+// Returns the cached value for the amount of disk space used by the filesystem. Do not rely on this
+// function for critical logical checks. It should only be used in areas where the actual disk usage
+// does not need to be perfect, e.g. API responses for server resource usage.
+func (fs *Filesystem) CachedUsage() int64 {
+	return atomic.LoadInt64(&fs.diskUsed)
+}
+
+// Internal helper function to allow other parts of the codebase to check the total used disk space
+// as needed without overly taxing the system. This will prioritize the value from the cache to avoid
+// excessive IO usage. We will only walk the filesystem and determine the size of the directory if there
+// is no longer a cached value.
+//
+// If "allowStaleValue" is set to true, a stale value MAY be returned to the caller if there is an
+// expired cache value AND there is currently another lookup in progress. If there is no cached value but
+// no other lookup is in progress, a fresh disk space response will be returned to the caller.
+//
+// This is primarily to avoid a bunch of I/O operations from piling up on the server, especially on servers
+// with a large amount of files.
+func (fs *Filesystem) DiskUsage(allowStaleValue bool) (int64, error) {
+	// A disk check interval of 0 means this functionality is completely disabled.
+	if fs.diskCheckInterval == 0 {
+		return 0, nil
+	}
+
+	if !fs.lastLookupTime.Get().After(time.Now().Add(time.Second * fs.diskCheckInterval * -1)) {
+		// If we are now allowing a stale response go ahead  and perform the lookup and return the fresh
+		// value. This is a blocking operation to the calling process.
+		if !allowStaleValue {
+			return fs.updateCachedDiskUsage()
+		} else if !fs.lookupInProgress.Load() {
+			// Otherwise, if we allow a stale value and there isn't a valid item in the cache and we aren't
+			// currently performing a lookup, just do the disk usage calculation in the background.
+			go func(fs *Filesystem) {
+				if _, err := fs.updateCachedDiskUsage(); err != nil {
+					log.WithField("root", fs.root).WithField("error", err).Warn("failed to update fs disk usage from within routine")
+				}
+			}(fs)
+		}
+	}
+
+	// Return the currently cached value back to the calling function.
+	return atomic.LoadInt64(&fs.diskUsed), nil
+}
+
+// Updates the currently used disk space for a server.
+func (fs *Filesystem) updateCachedDiskUsage() (int64, error) {
+	// Obtain an exclusive lock on this process so that we don't unintentionally run it at the same
+	// time as another running process. Once the lock is available it'll read from the cache for the
+	// second call rather than hitting the disk in parallel.
+	fs.mu.Lock()
+	defer fs.mu.Unlock()
+
+	// Signal that we're currently updating the disk size so that other calls to the disk checking
+	// functions can determine if they should queue up additional calls to this function. Ensure that
+	// we always set this back to "false" when this process is done executing.
+	fs.lookupInProgress.Store(true)
+	defer fs.lookupInProgress.Store(false)
+
+	// If there is no size its either because there is no data (in which case running this function
+	// will have effectively no impact), or there is nothing in the cache, in which case we need to
+	// grab the size of their data directory. This is a taxing operation, so we want to store it in
+	// the cache once we've gotten it.
+	size, err := fs.DirectorySize("/")
+
+	// Always cache the size, even if there is an error. We want to always return that value
+	// so that we don't cause an endless loop of determining the disk size if there is a temporary
+	// error encountered.
+	fs.lastLookupTime.Set(time.Now())
+
+	atomic.StoreInt64(&fs.diskUsed, size)
+
+	return size, err
+}
+
+// Determines the directory size of a given location by running parallel tasks to iterate
+// through all of the folders. Returns the size in bytes. This can be a fairly taxing operation
+// on locations with tons of files, so it is recommended that you cache the output.
+func (fs *Filesystem) DirectorySize(dir string) (int64, error) {
+	d, err := fs.SafePath(dir)
+	if err != nil {
+		return 0, err
+	}
+
+	var size int64
+	var st syscall.Stat_t
+
+	err = godirwalk.Walk(d, &godirwalk.Options{
+		Unsorted: true,
+		Callback: func(p string, e *godirwalk.Dirent) error {
+			// If this is a symlink then resolve the final destination of it before trying to continue walking
+			// over its contents. If it resolves outside the server data directory just skip everything else for
+			// it. Otherwise, allow it to continue.
+			if e.IsSymlink() {
+				if _, err := fs.SafePath(p); err != nil {
+					if IsErrorCode(err, ErrCodePathResolution) {
+						return godirwalk.SkipThis
+					}
+
+					return err
+				}
+			}
+
+			if !e.IsDir() {
+				syscall.Lstat(p, &st)
+				atomic.AddInt64(&size, st.Size)
+			}
+
+			return nil
+		},
+	})
+
+	return size, err
+}
+
+// Helper function to determine if a server has space available for a file of a given size.
+// If space is available, no error will be returned, otherwise an ErrNotEnoughSpace error
+// will be raised.
+func (fs *Filesystem) HasSpaceFor(size int64) error {
+	if fs.MaxDisk() == 0 {
+		return nil
+	}
+
+	s, err := fs.DiskUsage(true)
+	if err != nil {
+		return err
+	}
+
+	if (s + size) > fs.MaxDisk() {
+		return &Error{code: ErrCodeDiskSpace}
+	}
+
+	return nil
+}
+
+// Updates the disk usage for the Filesystem instance.
+func (fs *Filesystem) addDisk(i int64) int64 {
+	size := atomic.LoadInt64(&fs.diskUsed)
+
+	// Sorry go gods. This is ugly but the best approach I can come up with for right
+	// now without completely re-evaluating the logic we use for determining disk space.
+	//
+	// Normally I would just be using the atomic load right below, but I'm not sure about
+	// the scenarios where it is 0 because nothing has run that would trigger a disk size
+	// calculation?
+	//
+	// Perhaps that isn't even a concern for the sake of this?
+	if !fs.isTest {
+		size, _ = fs.DiskUsage(true)
+	}
+
+	// If we're dropping below 0 somehow just cap it to 0.
+	if (size + i) < 0 {
+		return atomic.SwapInt64(&fs.diskUsed, 0)
+	}
+
+	return atomic.AddInt64(&fs.diskUsed, i)
+}

server/filesystem/errors.go

@@ -0,0 +1,95 @@
+package filesystem
+
+import (
+	"emperror.dev/errors"
+	"fmt"
+	"github.com/apex/log"
+	"os"
+	"path/filepath"
+)
+
+type ErrorCode string
+
+const (
+	ErrCodeIsDirectory    ErrorCode = "E_ISDIR"
+	ErrCodeDiskSpace      ErrorCode = "E_NODISK"
+	ErrCodeUnknownArchive ErrorCode = "E_UNKNFMT"
+	ErrCodePathResolution ErrorCode = "E_BADPATH"
+)
+
+type Error struct {
+	code     ErrorCode
+	path     string
+	resolved string
+}
+
+// Returns a human-readable error string to identify the Error by.
+func (e *Error) Error() string {
+	switch e.code {
+	case ErrCodeIsDirectory:
+		return "filesystem: is a directory"
+	case ErrCodeDiskSpace:
+		return "filesystem: not enough disk space"
+	case ErrCodeUnknownArchive:
+		return "filesystem: unknown archive format"
+	case ErrCodePathResolution:
+		r := e.resolved
+		if r == "" {
+			r = "<empty>"
+		}
+		return fmt.Sprintf("filesystem: server path [%s] resolves to a location outside the server root: %s", e.path, r)
+	}
+	return "filesystem: unhandled error type"
+}
+
+// Returns the ErrorCode for this specific error instance.
+func (e *Error) Code() ErrorCode {
+	return e.code
+}
+
+// Checks if the given error is one of the Filesystem errors.
+func IsFilesystemError(err error) (*Error, bool) {
+	if e := errors.Unwrap(err); e != nil {
+		err = e
+	}
+	if fserr, ok := err.(*Error); ok {
+		return fserr, true
+	}
+	return nil, false
+}
+
+// Checks if "err" is a filesystem Error type. If so, it will then drop in and check
+// that the error code is the same as the provided ErrorCode passed in "code".
+func IsErrorCode(err error, code ErrorCode) bool {
+	if e, ok := IsFilesystemError(err); ok {
+		return e.code == code
+	}
+	return false
+}
+
+// Returns a new BadPathResolution error.
+func NewBadPathResolution(path string, resolved string) *Error {
+	return &Error{code: ErrCodePathResolution, path: path, resolved: resolved}
+}
+
+// Generates an error logger instance with some basic information.
+func (fs *Filesystem) error(err error) *log.Entry {
+	return log.WithField("subsystem", "filesystem").WithField("root", fs.root).WithField("error", err)
+}
+
+// Handle errors encountered when walking through directories.
+//
+// If there is a path resolution error just skip the item entirely. Only return this for a
+// directory, otherwise return nil. Returning this error for a file will stop the walking
+// for the remainder of the directory. This is assuming an os.FileInfo struct was even returned.
+func (fs *Filesystem) handleWalkerError(err error, f os.FileInfo) error {
+	if !IsErrorCode(err, ErrCodePathResolution) {
+		return err
+	}
+
+	if f != nil && f.IsDir() {
+		return filepath.SkipDir
+	}
+
+	return nil
+}

server/filesystem/errors_test.go

@@ -0,0 +1,24 @@
+package filesystem
+
+import (
+	. "github.com/franela/goblin"
+	"testing"
+)
+
+func TestFilesystem_PathResolutionError(t *testing.T) {
+	g := Goblin(t)
+
+	g.Describe("NewBadPathResolutionError", func() {
+		g.It("is can detect itself as an error correctly", func() {
+			err := NewBadPathResolution("foo", "bar")
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+			g.Assert(err.Error()).Equal("filesystem: server path [foo] resolves to a location outside the server root: bar")
+			g.Assert(IsErrorCode(&Error{code: ErrCodeIsDirectory}, ErrCodePathResolution)).IsFalse()
+		})
+
+		g.It("returns <empty> if no destination path is provided", func() {
+			err := NewBadPathResolution("foo", "")
+			g.Assert(err.Error()).Equal("filesystem: server path [foo] resolves to a location outside the server root: <empty>")
+		})
+	})
+}

server/filesystem/filesystem.go

@@ -0,0 +1,491 @@
+package filesystem
+
+import (
+	"bufio"
+	"emperror.dev/errors"
+	"github.com/gabriel-vasile/mimetype"
+	"github.com/karrick/godirwalk"
+	"github.com/pterodactyl/wings/config"
+	"github.com/pterodactyl/wings/system"
+	"io"
+	"io/ioutil"
+	"os"
+	"path"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+)
+
+type Filesystem struct {
+	mu                sync.RWMutex
+	lastLookupTime    *usageLookupTime
+	lookupInProgress  *system.AtomicBool
+	diskUsed          int64
+	diskCheckInterval time.Duration
+
+	// The maximum amount of disk space (in bytes) that this Filesystem instance can use.
+	diskLimit int64
+
+	// The root data directory path for this Filesystem instance.
+	root string
+
+	isTest bool
+}
+
+// Creates a new Filesystem instance for a given server.
+func New(root string, size int64) *Filesystem {
+	return &Filesystem{
+		root:              root,
+		diskLimit:         size,
+		diskCheckInterval: time.Duration(config.Get().System.DiskCheckInterval),
+		lastLookupTime:    &usageLookupTime{},
+		lookupInProgress:  system.NewAtomicBool(false),
+	}
+}
+
+// Returns the root path for the Filesystem instance.
+func (fs *Filesystem) Path() string {
+	return fs.root
+}
+
+// Returns a reader for a file instance.
+func (fs *Filesystem) File(p string) (*os.File, os.FileInfo, error) {
+	cleaned, err := fs.SafePath(p)
+	if err != nil {
+		return nil, nil, err
+	}
+	st, err := os.Stat(cleaned)
+	if err != nil {
+		return nil, nil, err
+	}
+	if st.IsDir() {
+		return nil, nil, &Error{code: ErrCodeIsDirectory}
+	}
+	f, err := os.Open(cleaned)
+	if err != nil {
+		return nil, nil, err
+	}
+	return f, st, nil
+}
+
+// Reads a file on the system and returns it as a byte representation in a file
+// reader. This is not the most memory efficient usage since it will be reading the
+// entirety of the file into memory.
+func (fs *Filesystem) Readfile(p string, w io.Writer) error {
+	file, _, err := fs.File(p)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+	_, err = bufio.NewReader(file).WriteTo(w)
+	return err
+}
+
+// Writes a file to the system. If the file does not already exist one will be created.
+func (fs *Filesystem) Writefile(p string, r io.Reader) error {
+	cleaned, err := fs.SafePath(p)
+	if err != nil {
+		return err
+	}
+
+	var currentSize int64
+	// If the file does not exist on the system already go ahead and create the pathway
+	// to it and an empty file. We'll then write to it later on after this completes.
+	stat, err := os.Stat(cleaned)
+	if err != nil && !os.IsNotExist(err) {
+		return err
+	} else if err == nil {
+		if stat.IsDir() {
+			return &Error{code: ErrCodeIsDirectory}
+		}
+		currentSize = stat.Size()
+	}
+
+	br := bufio.NewReader(r)
+	// Check that the new size we're writing to the disk can fit. If there is currently
+	// a file we'll subtract that current file size from the size of the buffer to determine
+	// the amount of new data we're writing (or amount we're removing if smaller).
+	if err := fs.HasSpaceFor(int64(br.Size()) - currentSize); err != nil {
+		return err
+	}
+
+	// If we were unable to stat the location because it did not exist, go ahead and create
+	// it now. We do this after checking the disk space so that we do not just create empty
+	// directories at random.
+	if err != nil {
+		if err := os.MkdirAll(filepath.Dir(cleaned), 0755); err != nil {
+			return err
+		}
+		if err := fs.Chown(filepath.Dir(cleaned)); err != nil {
+			return err
+		}
+	}
+
+	o := &fileOpener{}
+	// This will either create the file if it does not already exist, or open and
+	// truncate the existing file.
+	file, err := o.open(cleaned, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	buf := make([]byte, 1024*4)
+	sz, err := io.CopyBuffer(file, r, buf)
+
+	// Adjust the disk usage to account for the old size and the new size of the file.
+	fs.addDisk(sz - currentSize)
+
+	// Finally, chown the file to ensure the permissions don't end up out-of-whack
+	// if we had just created it.
+	return fs.Chown(cleaned)
+}
+
+// Creates a new directory (name) at a specified path (p) for the server.
+func (fs *Filesystem) CreateDirectory(name string, p string) error {
+	cleaned, err := fs.SafePath(path.Join(p, name))
+	if err != nil {
+		return err
+	}
+
+	return os.MkdirAll(cleaned, 0755)
+}
+
+// Moves (or renames) a file or directory.
+func (fs *Filesystem) Rename(from string, to string) error {
+	cleanedFrom, err := fs.SafePath(from)
+	if err != nil {
+		return err
+	}
+
+	cleanedTo, err := fs.SafePath(to)
+	if err != nil {
+		return err
+	}
+
+	// If the target file or directory already exists the rename function will fail, so just
+	// bail out now.
+	if _, err := os.Stat(cleanedTo); err == nil {
+		return os.ErrExist
+	}
+
+	if cleanedTo == fs.Path() {
+		return errors.New("attempting to rename into an invalid directory space")
+	}
+
+	d := strings.TrimSuffix(cleanedTo, path.Base(cleanedTo))
+	// Ensure that the directory we're moving into exists correctly on the system. Only do this if
+	// we're not at the root directory level.
+	if d != fs.Path() {
+		if mkerr := os.MkdirAll(d, 0755); mkerr != nil {
+			return errors.WithMessage(mkerr, "failed to create directory structure for file rename")
+		}
+	}
+
+	return os.Rename(cleanedFrom, cleanedTo)
+}
+
+// Recursively iterates over a file or directory and sets the permissions on all of the
+// underlying files. Iterate over all of the files and directories. If it is a file just
+// go ahead and perform the chown operation. Otherwise dig deeper into the directory until
+// we've run out of directories to dig into.
+func (fs *Filesystem) Chown(path string) error {
+	cleaned, err := fs.SafePath(path)
+	if err != nil {
+		return err
+	}
+
+	if fs.isTest {
+		return nil
+	}
+
+	uid := config.Get().System.User.Uid
+	gid := config.Get().System.User.Gid
+
+	// Start by just chowning the initial path that we received.
+	if err := os.Chown(cleaned, uid, gid); err != nil {
+		return err
+	}
+
+	// If this is not a directory we can now return from the function, there is nothing
+	// left that we need to do.
+	if st, _ := os.Stat(cleaned); !st.IsDir() {
+		return nil
+	}
+
+	// If this was a directory, begin walking over its contents recursively and ensure that all
+	// of the subfiles and directories get their permissions updated as well.
+	return godirwalk.Walk(cleaned, &godirwalk.Options{
+		Unsorted: true,
+		Callback: func(p string, e *godirwalk.Dirent) error {
+			// Do not attempt to chmod a symlink. Go's os.Chown function will affect the symlink
+			// so if it points to a location outside the data directory the user would be able to
+			// (un)intentionally modify that files permissions.
+			if e.IsSymlink() {
+				if e.IsDir() {
+					return godirwalk.SkipThis
+				}
+
+				return nil
+			}
+
+			return os.Chown(p, uid, gid)
+		},
+	})
+}
+
+func (fs *Filesystem) Chmod(path string, mode os.FileMode) error {
+	cleaned, err := fs.SafePath(path)
+	if err != nil {
+		return err
+	}
+
+	if fs.isTest {
+		return nil
+	}
+
+	if err := os.Chmod(cleaned, mode); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Begin looping up to 50 times to try and create a unique copy file name. This will take
+// an input of "file.txt" and generate "file copy.txt". If that name is already taken, it will
+// then try to write "file copy 2.txt" and so on, until reaching 50 loops. At that point we
+// won't waste anymore time, just use the current timestamp and make that copy.
+//
+// Could probably make this more efficient by checking if there are any files matching the copy
+// pattern, and trying to find the highest number and then incrementing it by one rather than
+// looping endlessly.
+func (fs *Filesystem) findCopySuffix(dir string, name string, extension string) (string, error) {
+	var i int
+	suffix := " copy"
+
+	for i = 0; i < 51; i++ {
+		if i > 0 {
+			suffix = " copy " + strconv.Itoa(i)
+		}
+
+		n := name + suffix + extension
+		// If we stat the file and it does not exist that means we're good to create the copy. If it
+		// does exist, we'll just continue to the next loop and try again.
+		if _, err := fs.Stat(path.Join(dir, n)); err != nil {
+			if !errors.Is(err, os.ErrNotExist) {
+				return "", err
+			}
+
+			break
+		}
+
+		if i == 50 {
+			suffix = "copy." + time.Now().Format(time.RFC3339)
+		}
+	}
+
+	return name + suffix + extension, nil
+}
+
+// Copies a given file to the same location and appends a suffix to the file to indicate that
+// it has been copied.
+func (fs *Filesystem) Copy(p string) error {
+	cleaned, err := fs.SafePath(p)
+	if err != nil {
+		return err
+	}
+
+	s, err := os.Stat(cleaned)
+	if err != nil {
+		return err
+	} else if s.IsDir() || !s.Mode().IsRegular() {
+		// If this is a directory or not a regular file, just throw a not-exist error
+		// since anything calling this function should understand what that means.
+		return os.ErrNotExist
+	}
+
+	// Check that copying this file wouldn't put the server over its limit.
+	if err := fs.HasSpaceFor(s.Size()); err != nil {
+		return err
+	}
+
+	base := filepath.Base(cleaned)
+	relative := strings.TrimSuffix(strings.TrimPrefix(cleaned, fs.Path()), base)
+	extension := filepath.Ext(base)
+	name := strings.TrimSuffix(base, extension)
+
+	// Ensure that ".tar" is also counted as apart of the file extension.
+	// There might be a better way to handle this for other double file extensions,
+	// but this is a good workaround for now.
+	if strings.HasSuffix(name, ".tar") {
+		extension = ".tar" + extension
+		name = strings.TrimSuffix(name, ".tar")
+	}
+
+	source, err := os.Open(cleaned)
+	if err != nil {
+		return err
+	}
+	defer source.Close()
+
+	n, err := fs.findCopySuffix(relative, name, extension)
+	if err != nil {
+		return err
+	}
+
+	return fs.Writefile(path.Join(relative, n), source)
+}
+
+// Deletes a file or folder from the system. Prevents the user from accidentally
+// (or maliciously) removing their root server data directory.
+func (fs *Filesystem) Delete(p string) error {
+	wg := sync.WaitGroup{}
+	// This is one of the few (only?) places in the codebase where we're explicitly not using
+	// the SafePath functionality when working with user provided input. If we did, you would
+	// not be able to delete a file that is a symlink pointing to a location outside of the data
+	// directory.
+	//
+	// We also want to avoid resolving a symlink that points _within_ the data directory and thus
+	// deleting the actual source file for the symlink rather than the symlink itself. For these
+	// purposes just resolve the actual file path using filepath.Join() and confirm that the path
+	// exists within the data directory.
+	resolved := fs.unsafeFilePath(p)
+	if !fs.unsafeIsInDataDirectory(resolved) {
+		return NewBadPathResolution(p, resolved)
+	}
+
+	// Block any whoopsies.
+	if resolved == fs.Path() {
+		return errors.New("cannot delete root server directory")
+	}
+
+	if st, err := os.Lstat(resolved); err != nil {
+		if !os.IsNotExist(err) {
+			fs.error(err).Warn("error while attempting to stat file before deletion")
+		}
+	} else {
+		if !st.IsDir() {
+			fs.addDisk(-st.Size())
+		} else {
+			wg.Add(1)
+			go func(wg *sync.WaitGroup, st os.FileInfo, resolved string) {
+				defer wg.Done()
+				if s, err := fs.DirectorySize(resolved); err == nil {
+					fs.addDisk(-s)
+				}
+			}(&wg, st, resolved)
+		}
+	}
+
+	wg.Wait()
+
+	return os.RemoveAll(resolved)
+}
+
+type fileOpener struct {
+	busy uint
+}
+
+// Attempts to open a given file up to "attempts" number of times, using a backoff. If the file
+// cannot be opened because of a "text file busy" error, we will attempt until the number of attempts
+// has been exhaused, at which point we will abort with an error.
+func (fo *fileOpener) open(path string, flags int, perm os.FileMode) (*os.File, error) {
+	for {
+		f, err := os.OpenFile(path, flags, perm)
+
+		// If there is an error because the text file is busy, go ahead and sleep for a few
+		// hundred milliseconds and then try again up to three times before just returning the
+		// error back to the caller.
+		//
+		// Based on code from: https://github.com/golang/go/issues/22220#issuecomment-336458122
+		if err != nil && fo.busy < 3 && strings.Contains(err.Error(), "text file busy") {
+			time.Sleep(100 * time.Millisecond << fo.busy)
+			fo.busy++
+			continue
+		}
+
+		return f, err
+	}
+}
+
+// Lists the contents of a given directory and returns stat information about each
+// file and folder within it.
+func (fs *Filesystem) ListDirectory(p string) ([]*Stat, error) {
+	cleaned, err := fs.SafePath(p)
+	if err != nil {
+		return nil, err
+	}
+
+	files, err := ioutil.ReadDir(cleaned)
+	if err != nil {
+		return nil, err
+	}
+
+	var wg sync.WaitGroup
+
+	// You must initialize the output of this directory as a non-nil value otherwise
+	// when it is marshaled into a JSON object you'll just get 'null' back, which will
+	// break the panel badly.
+	out := make([]*Stat, len(files))
+
+	// Iterate over all of the files and directories returned and perform an async process
+	// to get the mime-type for them all.
+	for i, file := range files {
+		wg.Add(1)
+
+		go func(idx int, f os.FileInfo) {
+			defer wg.Done()
+
+			var m *mimetype.MIME
+			var d = "inode/directory"
+			if !f.IsDir() {
+				cleanedp := filepath.Join(cleaned, f.Name())
+				if f.Mode()&os.ModeSymlink != 0 {
+					cleanedp, _ = fs.SafePath(filepath.Join(cleaned, f.Name()))
+				}
+
+				if cleanedp != "" {
+					m, _ = mimetype.DetectFile(filepath.Join(cleaned, f.Name()))
+				} else {
+					// Just pass this for an unknown type because the file could not safely be resolved within
+					// the server data path.
+					d = "application/octet-stream"
+				}
+			}
+
+			st := &Stat{
+				Info:     f,
+				Mimetype: d,
+			}
+
+			if m != nil {
+				st.Mimetype = m.String()
+			}
+
+			out[idx] = st
+		}(i, file)
+	}
+
+	wg.Wait()
+
+	// Sort the output alphabetically to begin with since we've run the output
+	// through an asynchronous process and the order is gonna be very random.
+	sort.SliceStable(out, func(i, j int) bool {
+		if out[i].Info.Name() == out[j].Info.Name() || out[i].Info.Name() > out[j].Info.Name() {
+			return true
+		}
+
+		return false
+	})
+
+	// Then, sort it so that directories are listed first in the output. Everything
+	// will continue to be alphabetized at this point.
+	sort.SliceStable(out, func(i, j int) bool {
+		return out[i].Info.IsDir()
+	})
+
+	return out, nil
+}

server/filesystem/filesystem_test.go

@@ -0,0 +1,570 @@
+package filesystem
+
+import (
+	"bytes"
+	"errors"
+	. "github.com/franela/goblin"
+	"github.com/pterodactyl/wings/config"
+	"io/ioutil"
+	"math/rand"
+	"os"
+	"path/filepath"
+	"sync/atomic"
+	"testing"
+	"unicode/utf8"
+)
+
+func NewFs() (*Filesystem, *rootFs) {
+	config.Set(&config.Configuration{
+		AuthenticationToken: "abc",
+		System: config.SystemConfiguration{
+			RootDirectory:     "/server",
+			DiskCheckInterval: 150,
+		},
+	})
+
+	tmpDir, err := ioutil.TempDir(os.TempDir(), "pterodactyl")
+	if err != nil {
+		panic(err)
+	}
+	// defer os.RemoveAll(tmpDir)
+
+	rfs := rootFs{root: tmpDir}
+
+	rfs.reset()
+
+	fs := New(filepath.Join(tmpDir, "/server"), 0)
+	fs.isTest = true
+
+	return fs, &rfs
+}
+
+type rootFs struct {
+	root string
+}
+
+func (rfs *rootFs) CreateServerFile(p string, c string) error {
+	f, err := os.Create(filepath.Join(rfs.root, "/server", p))
+
+	if err == nil {
+		f.Write([]byte(c))
+		f.Close()
+	}
+
+	return err
+}
+
+func (rfs *rootFs) StatServerFile(p string) (os.FileInfo, error) {
+	return os.Stat(filepath.Join(rfs.root, "/server", p))
+}
+
+func (rfs *rootFs) reset() {
+	if err := os.RemoveAll(filepath.Join(rfs.root, "/server")); err != nil {
+		if !os.IsNotExist(err) {
+			panic(err)
+		}
+	}
+
+	if err := os.Mkdir(filepath.Join(rfs.root, "/server"), 0755); err != nil {
+		panic(err)
+	}
+}
+
+func TestFilesystem_Readfile(t *testing.T) {
+	g := Goblin(t)
+	fs, rfs := NewFs()
+
+	g.Describe("Readfile", func() {
+		buf := &bytes.Buffer{}
+
+		g.It("opens a file if it exists on the system", func() {
+			err := rfs.CreateServerFile("test.txt", "testing")
+			g.Assert(err).IsNil()
+
+			err = fs.Readfile("test.txt", buf)
+			g.Assert(err).IsNil()
+			g.Assert(buf.String()).Equal("testing")
+		})
+
+		g.It("returns an error if the file does not exist", func() {
+			err := fs.Readfile("test.txt", buf)
+			g.Assert(err).IsNotNil()
+			g.Assert(errors.Is(err, os.ErrNotExist)).IsTrue()
+		})
+
+		g.It("returns an error if the \"file\" is a directory", func() {
+			err := os.Mkdir(filepath.Join(rfs.root, "/server/test.txt"), 0755)
+			g.Assert(err).IsNil()
+
+			err = fs.Readfile("test.txt", buf)
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodeIsDirectory)).IsTrue()
+		})
+
+		g.It("cannot open a file outside the root directory", func() {
+			err := rfs.CreateServerFile("/../test.txt", "testing")
+			g.Assert(err).IsNil()
+
+			err = fs.Readfile("/../test.txt", buf)
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.AfterEach(func() {
+			buf.Truncate(0)
+			atomic.StoreInt64(&fs.diskUsed, 0)
+			rfs.reset()
+		})
+	})
+}
+
+func TestFilesystem_Writefile(t *testing.T) {
+	g := Goblin(t)
+	fs, rfs := NewFs()
+
+	g.Describe("Open and WriteFile", func() {
+		buf := &bytes.Buffer{}
+
+		// Test that a file can be written to the disk and that the disk space used as a result
+		// is updated correctly in the end.
+		g.It("can create a new file", func() {
+			r := bytes.NewReader([]byte("test file content"))
+
+			g.Assert(atomic.LoadInt64(&fs.diskUsed)).Equal(int64(0))
+
+			err := fs.Writefile("test.txt", r)
+			g.Assert(err).IsNil()
+
+			err = fs.Readfile("test.txt", buf)
+			g.Assert(err).IsNil()
+			g.Assert(buf.String()).Equal("test file content")
+			g.Assert(atomic.LoadInt64(&fs.diskUsed)).Equal(r.Size())
+		})
+
+		g.It("can create a new file inside a nested directory with leading slash", func() {
+			r := bytes.NewReader([]byte("test file content"))
+
+			err := fs.Writefile("/some/nested/test.txt", r)
+			g.Assert(err).IsNil()
+
+			err = fs.Readfile("/some/nested/test.txt", buf)
+			g.Assert(err).IsNil()
+			g.Assert(buf.String()).Equal("test file content")
+		})
+
+		g.It("can create a new file inside a nested directory without a trailing slash", func() {
+			r := bytes.NewReader([]byte("test file content"))
+
+			err := fs.Writefile("some/../foo/bar/test.txt", r)
+			g.Assert(err).IsNil()
+
+			err = fs.Readfile("foo/bar/test.txt", buf)
+			g.Assert(err).IsNil()
+			g.Assert(buf.String()).Equal("test file content")
+		})
+
+		g.It("cannot create a file outside the root directory", func() {
+			r := bytes.NewReader([]byte("test file content"))
+
+			err := fs.Writefile("/some/../foo/../../test.txt", r)
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("cannot write a file that exceeds the disk limits", func() {
+			atomic.StoreInt64(&fs.diskLimit, 1024)
+
+			b := make([]byte, 1025)
+			_, err := rand.Read(b)
+			g.Assert(err).IsNil()
+			g.Assert(len(b)).Equal(1025)
+
+			r := bytes.NewReader(b)
+			err = fs.Writefile("test.txt", r)
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodeDiskSpace)).IsTrue()
+		})
+
+		/*g.It("updates the total space used when a file is appended to", func() {
+			atomic.StoreInt64(&fs.diskUsed, 100)
+
+			b := make([]byte, 100)
+			_, _ = rand.Read(b)
+
+			r := bytes.NewReader(b)
+			err := fs.Writefile("test.txt", r)
+			g.Assert(err).IsNil()
+			g.Assert(atomic.LoadInt64(&fs.diskUsed)).Equal(int64(200))
+
+			// If we write less data than already exists, we should expect the total
+			// disk used to be decremented.
+			b = make([]byte, 50)
+			_, _ = rand.Read(b)
+
+			r = bytes.NewReader(b)
+			err = fs.Writefile("test.txt", r)
+			g.Assert(err).IsNil()
+			g.Assert(atomic.LoadInt64(&fs.diskUsed)).Equal(int64(150))
+		})*/
+
+		g.It("truncates the file when writing new contents", func() {
+			r := bytes.NewReader([]byte("original data"))
+			err := fs.Writefile("test.txt", r)
+			g.Assert(err).IsNil()
+
+			r = bytes.NewReader([]byte("new data"))
+			err = fs.Writefile("test.txt", r)
+			g.Assert(err).IsNil()
+
+			err = fs.Readfile("test.txt", buf)
+			g.Assert(err).IsNil()
+			g.Assert(buf.String()).Equal("new data")
+		})
+
+		g.AfterEach(func() {
+			buf.Truncate(0)
+			rfs.reset()
+
+			atomic.StoreInt64(&fs.diskUsed, 0)
+			atomic.StoreInt64(&fs.diskLimit, 0)
+		})
+	})
+}
+
+func TestFilesystem_CreateDirectory(t *testing.T) {
+	g := Goblin(t)
+	fs, rfs := NewFs()
+
+	g.Describe("CreateDirectory", func() {
+		g.It("should create missing directories automatically", func() {
+			err := fs.CreateDirectory("test", "foo/bar/baz")
+			g.Assert(err).IsNil()
+
+			st, err := rfs.StatServerFile("foo/bar/baz/test")
+			g.Assert(err).IsNil()
+			g.Assert(st.IsDir()).IsTrue()
+			g.Assert(st.Name()).Equal("test")
+		})
+
+		g.It("should work with leading and trailing slashes", func() {
+			err := fs.CreateDirectory("test", "/foozie/barzie/bazzy/")
+			g.Assert(err).IsNil()
+
+			st, err := rfs.StatServerFile("foozie/barzie/bazzy/test")
+			g.Assert(err).IsNil()
+			g.Assert(st.IsDir()).IsTrue()
+			g.Assert(st.Name()).Equal("test")
+		})
+
+		g.It("should not allow the creation of directories outside the root", func() {
+			err := fs.CreateDirectory("test", "e/../../something")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("should not increment the disk usage", func() {
+			err := fs.CreateDirectory("test", "/")
+			g.Assert(err).IsNil()
+			g.Assert(atomic.LoadInt64(&fs.diskUsed)).Equal(int64(0))
+		})
+
+		g.AfterEach(func() {
+			rfs.reset()
+		})
+	})
+}
+
+func TestFilesystem_Rename(t *testing.T) {
+	g := Goblin(t)
+	fs, rfs := NewFs()
+
+	g.Describe("Rename", func() {
+		g.BeforeEach(func() {
+			if err := rfs.CreateServerFile("source.txt", "text content"); err != nil {
+				panic(err)
+			}
+		})
+
+		g.It("returns an error if the target already exists", func() {
+			err := rfs.CreateServerFile("target.txt", "taget content")
+			g.Assert(err).IsNil()
+
+			err = fs.Rename("source.txt", "target.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(errors.Is(err, os.ErrExist)).IsTrue()
+		})
+
+		g.It("returns an error if the final destination is the root directory", func() {
+			err := fs.Rename("source.txt", "/")
+			g.Assert(err).IsNotNil()
+			g.Assert(errors.Is(err, os.ErrExist)).IsTrue()
+		})
+
+		g.It("returns an error if the source destination is the root directory", func() {
+			err := fs.Rename("source.txt", "/")
+			g.Assert(err).IsNotNil()
+			g.Assert(errors.Is(err, os.ErrExist)).IsTrue()
+		})
+
+		g.It("does not allow renaming to a location outside the root", func() {
+			err := fs.Rename("source.txt", "../target.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("does not allow renaming from a location outside the root", func() {
+			err := rfs.CreateServerFile("/../ext-source.txt", "taget content")
+
+			err = fs.Rename("/../ext-source.txt", "target.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("allows a file to be renamed", func() {
+			err := fs.Rename("source.txt", "target.txt")
+			g.Assert(err).IsNil()
+
+			_, err = rfs.StatServerFile("source.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(errors.Is(err, os.ErrNotExist)).IsTrue()
+
+			st, err := rfs.StatServerFile("target.txt")
+			g.Assert(err).IsNil()
+			g.Assert(st.Name()).Equal("target.txt")
+			g.Assert(st.Size()).IsNotZero()
+		})
+
+		g.It("allows a folder to be renamed", func() {
+			err := os.Mkdir(filepath.Join(rfs.root, "/server/source_dir"), 0755)
+			g.Assert(err).IsNil()
+
+			err = fs.Rename("source_dir", "target_dir")
+			g.Assert(err).IsNil()
+
+			_, err = rfs.StatServerFile("source_dir")
+			g.Assert(err).IsNotNil()
+			g.Assert(errors.Is(err, os.ErrNotExist)).IsTrue()
+
+			st, err := rfs.StatServerFile("target_dir")
+			g.Assert(err).IsNil()
+			g.Assert(st.IsDir()).IsTrue()
+		})
+
+		g.It("returns an error if the source does not exist", func() {
+			err := fs.Rename("missing.txt", "target.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(errors.Is(err, os.ErrNotExist)).IsTrue()
+		})
+
+		g.It("creates directories if they are missing", func() {
+			err := fs.Rename("source.txt", "nested/folder/target.txt")
+			g.Assert(err).IsNil()
+
+			st, err := rfs.StatServerFile("nested/folder/target.txt")
+			g.Assert(err).IsNil()
+			g.Assert(st.Name()).Equal("target.txt")
+		})
+
+		g.AfterEach(func() {
+			rfs.reset()
+		})
+	})
+}
+
+func TestFilesystem_Copy(t *testing.T) {
+	g := Goblin(t)
+	fs, rfs := NewFs()
+
+	g.Describe("Copy", func() {
+		g.BeforeEach(func() {
+			if err := rfs.CreateServerFile("source.txt", "text content"); err != nil {
+				panic(err)
+			}
+
+			atomic.StoreInt64(&fs.diskUsed, int64(utf8.RuneCountInString("test content")))
+		})
+
+		g.It("should return an error if the source does not exist", func() {
+			err := fs.Copy("foo.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(errors.Is(err, os.ErrNotExist)).IsTrue()
+		})
+
+		g.It("should return an error if the source is outside the root", func() {
+			err := rfs.CreateServerFile("/../ext-source.txt", "text content")
+
+			err = fs.Copy("../ext-source.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("should return an error if the source directory is outside the root", func() {
+			err := os.MkdirAll(filepath.Join(rfs.root, "/nested/in/dir"), 0755)
+			g.Assert(err).IsNil()
+
+			err = rfs.CreateServerFile("/../nested/in/dir/ext-source.txt", "external content")
+			g.Assert(err).IsNil()
+
+			err = fs.Copy("../nested/in/dir/ext-source.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+
+			err = fs.Copy("nested/in/../../../nested/in/dir/ext-source.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("should return an error if the source is a directory", func() {
+			err := os.Mkdir(filepath.Join(rfs.root, "/server/dir"), 0755)
+			g.Assert(err).IsNil()
+
+			err = fs.Copy("dir")
+			g.Assert(err).IsNotNil()
+			g.Assert(errors.Is(err, os.ErrNotExist)).IsTrue()
+		})
+
+		g.It("should return an error if there is not space to copy the file", func() {
+			atomic.StoreInt64(&fs.diskLimit, 2)
+
+			err := fs.Copy("source.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodeDiskSpace)).IsTrue()
+		})
+
+		g.It("should create a copy of the file and increment the disk used", func() {
+			err := fs.Copy("source.txt")
+			g.Assert(err).IsNil()
+
+			_, err = rfs.StatServerFile("source.txt")
+			g.Assert(err).IsNil()
+
+			_, err = rfs.StatServerFile("source copy.txt")
+			g.Assert(err).IsNil()
+		})
+
+		g.It("should create a copy of the file with a suffix if a copy already exists", func() {
+			err := fs.Copy("source.txt")
+			g.Assert(err).IsNil()
+
+			err = fs.Copy("source.txt")
+			g.Assert(err).IsNil()
+
+			r := []string{"source.txt", "source copy.txt", "source copy 1.txt"}
+
+			for _, name := range r {
+				_, err = rfs.StatServerFile(name)
+				g.Assert(err).IsNil()
+			}
+
+			g.Assert(atomic.LoadInt64(&fs.diskUsed)).Equal(int64(utf8.RuneCountInString("test content")) * 3)
+		})
+
+		g.It("should create a copy inside of a directory", func() {
+			err := os.MkdirAll(filepath.Join(rfs.root, "/server/nested/in/dir"), 0755)
+			g.Assert(err).IsNil()
+
+			err = rfs.CreateServerFile("nested/in/dir/source.txt", "test content")
+			g.Assert(err).IsNil()
+
+			err = fs.Copy("nested/in/dir/source.txt")
+			g.Assert(err).IsNil()
+
+			_, err = rfs.StatServerFile("nested/in/dir/source.txt")
+			g.Assert(err).IsNil()
+
+			_, err = rfs.StatServerFile("nested/in/dir/source copy.txt")
+			g.Assert(err).IsNil()
+		})
+
+		g.AfterEach(func() {
+			rfs.reset()
+
+			atomic.StoreInt64(&fs.diskUsed, 0)
+			atomic.StoreInt64(&fs.diskLimit, 0)
+		})
+	})
+}
+
+func TestFilesystem_Delete(t *testing.T) {
+	g := Goblin(t)
+	fs, rfs := NewFs()
+
+	g.Describe("Delete", func() {
+		g.BeforeEach(func() {
+			if err := rfs.CreateServerFile("source.txt", "test content"); err != nil {
+				panic(err)
+			}
+
+			atomic.StoreInt64(&fs.diskUsed, int64(utf8.RuneCountInString("test content")))
+		})
+
+		g.It("does not delete files outside the root directory", func() {
+			err := rfs.CreateServerFile("/../ext-source.txt", "external content")
+
+			err = fs.Delete("../ext-source.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("does not allow the deletion of the root directory", func() {
+			err := fs.Delete("/")
+			g.Assert(err).IsNotNil()
+			g.Assert(err.Error()).Equal("cannot delete root server directory")
+		})
+
+		g.It("does not return an error if the target does not exist", func() {
+			err := fs.Delete("missing.txt")
+			g.Assert(err).IsNil()
+
+			st, err := rfs.StatServerFile("source.txt")
+			g.Assert(err).IsNil()
+			g.Assert(st.Name()).Equal("source.txt")
+		})
+
+		g.It("deletes files and subtracts their size from the disk usage", func() {
+			err := fs.Delete("source.txt")
+			g.Assert(err).IsNil()
+
+			_, err = rfs.StatServerFile("source.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(errors.Is(err, os.ErrNotExist)).IsTrue()
+
+			g.Assert(atomic.LoadInt64(&fs.diskUsed)).Equal(int64(0))
+		})
+
+		g.It("deletes all items inside a directory if the directory is deleted", func() {
+			sources := []string{
+				"foo/source.txt",
+				"foo/bar/source.txt",
+				"foo/bar/baz/source.txt",
+			}
+
+			err := os.MkdirAll(filepath.Join(rfs.root, "/server/foo/bar/baz"), 0755)
+			g.Assert(err).IsNil()
+
+			for _, s := range sources {
+				err = rfs.CreateServerFile(s, "test content")
+				g.Assert(err).IsNil()
+			}
+
+			atomic.StoreInt64(&fs.diskUsed, int64(utf8.RuneCountInString("test content")*3))
+
+			err = fs.Delete("foo")
+			g.Assert(err).IsNil()
+			g.Assert(atomic.LoadInt64(&fs.diskUsed)).Equal(int64(0))
+
+			for _, s := range sources {
+				_, err = rfs.StatServerFile(s)
+				g.Assert(err).IsNotNil()
+				g.Assert(errors.Is(err, os.ErrNotExist)).IsTrue()
+			}
+		})
+
+		g.AfterEach(func() {
+			rfs.reset()
+
+			atomic.StoreInt64(&fs.diskUsed, 0)
+			atomic.StoreInt64(&fs.diskLimit, 0)
+		})
+	})
+}

server/filesystem/path.go

@@ -0,0 +1,141 @@
+package filesystem
+
+import (
+	"context"
+	"golang.org/x/sync/errgroup"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+)
+
+// Normalizes a directory being passed in to ensure the user is not able to escape
+// from their data directory. After normalization if the directory is still within their home
+// path it is returned. If they managed to "escape" an error will be returned.
+//
+// This logic is actually copied over from the SFTP server code. Ideally that eventually
+// either gets ported into this application, or is able to make use of this package.
+func (fs *Filesystem) SafePath(p string) (string, error) {
+	var nonExistentPathResolution string
+
+	// Start with a cleaned up path before checking the more complex bits.
+	r := fs.unsafeFilePath(p)
+
+	// At the same time, evaluate the symlink status and determine where this file or folder
+	// is truly pointing to.
+	ep, err := filepath.EvalSymlinks(r)
+	if err != nil && !os.IsNotExist(err) {
+		return "", err
+	} else if os.IsNotExist(err) {
+		// The requested directory doesn't exist, so at this point we need to iterate up the
+		// path chain until we hit a directory that _does_ exist and can be validated.
+		parts := strings.Split(filepath.Dir(r), "/")
+
+		var try string
+		// Range over all of the path parts and form directory pathings from the end
+		// moving up until we have a valid resolution or we run out of paths to try.
+		for k := range parts {
+			try = strings.Join(parts[:(len(parts)-k)], "/")
+
+			if !fs.unsafeIsInDataDirectory(try) {
+				break
+			}
+
+			t, err := filepath.EvalSymlinks(try)
+			if err == nil {
+				nonExistentPathResolution = t
+				break
+			}
+		}
+	}
+
+	// If the new path doesn't start with their root directory there is clearly an escape
+	// attempt going on, and we should NOT resolve this path for them.
+	if nonExistentPathResolution != "" {
+		if !fs.unsafeIsInDataDirectory(nonExistentPathResolution) {
+			return "", NewBadPathResolution(p, nonExistentPathResolution)
+		}
+
+		// If the nonExistentPathResolution variable is not empty then the initial path requested
+		// did not exist and we looped through the pathway until we found a match. At this point
+		// we've confirmed the first matched pathway exists in the root server directory, so we
+		// can go ahead and just return the path that was requested initially.
+		return r, nil
+	}
+
+	// If the requested directory from EvalSymlinks begins with the server root directory go
+	// ahead and return it. If not we'll return an error which will block any further action
+	// on the file.
+	if fs.unsafeIsInDataDirectory(ep) {
+		return ep, nil
+	}
+
+	return "", NewBadPathResolution(p, r)
+}
+
+// Generate a path to the file by cleaning it up and appending the root server path to it. This
+// DOES NOT guarantee that the file resolves within the server data directory. You'll want to use
+// the fs.unsafeIsInDataDirectory(p) function to confirm.
+func (fs *Filesystem) unsafeFilePath(p string) string {
+	// Calling filepath.Clean on the joined directory will resolve it to the absolute path,
+	// removing any ../ type of resolution arguments, and leaving us with a direct path link.
+	//
+	// This will also trim the existing root path off the beginning of the path passed to
+	// the function since that can get a bit messy.
+	return filepath.Clean(filepath.Join(fs.Path(), strings.TrimPrefix(p, fs.Path())))
+}
+
+// Check that that path string starts with the server data directory path. This function DOES NOT
+// validate that the rest of the path does not end up resolving out of this directory, or that the
+// targeted file or folder is not a symlink doing the same thing.
+func (fs *Filesystem) unsafeIsInDataDirectory(p string) bool {
+	return strings.HasPrefix(strings.TrimSuffix(p, "/")+"/", strings.TrimSuffix(fs.Path(), "/")+"/")
+}
+
+// Executes the fs.SafePath function in parallel against an array of paths. If any of the calls
+// fails an error will be returned.
+func (fs *Filesystem) ParallelSafePath(paths []string) ([]string, error) {
+	var cleaned []string
+
+	// Simple locker function to avoid racy appends to the array of cleaned paths.
+	var m = new(sync.Mutex)
+	var push = func(c string) {
+		m.Lock()
+		cleaned = append(cleaned, c)
+		m.Unlock()
+	}
+
+	// Create an error group that we can use to run processes in parallel while retaining
+	// the ability to cancel the entire process immediately should any of it fail.
+	g, ctx := errgroup.WithContext(context.Background())
+
+	// Iterate over all of the paths and generate a cleaned path, if there is an error for any
+	// of the files, abort the process.
+	for _, p := range paths {
+		// Create copy so we can use it within the goroutine correctly.
+		pi := p
+
+		// Recursively call this function to continue digging through the directory tree within
+		// a separate goroutine. If the context is canceled abort this process.
+		g.Go(func() error {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			default:
+				// If the callback returns true, go ahead and keep walking deeper. This allows
+				// us to programmatically continue deeper into directories, or stop digging
+				// if that pathway knows it needs nothing else.
+				if c, err := fs.SafePath(pi); err != nil {
+					return err
+				} else {
+					push(c)
+				}
+
+				return nil
+			}
+		})
+	}
+
+	// Block until all of the routines finish and have returned a value.
+	return cleaned, g.Wait()
+}

server/filesystem/path_test.go

@@ -0,0 +1,228 @@
+package filesystem
+
+import (
+	"bytes"
+	"emperror.dev/errors"
+	. "github.com/franela/goblin"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestFilesystem_Path(t *testing.T) {
+	g := Goblin(t)
+	fs, rfs := NewFs()
+
+	g.Describe("Path", func() {
+		g.It("returns the root path for the instance", func() {
+			g.Assert(fs.Path()).Equal(filepath.Join(rfs.root, "/server"))
+		})
+	})
+}
+
+func TestFilesystem_SafePath(t *testing.T) {
+	g := Goblin(t)
+	fs, rfs := NewFs()
+	prefix := filepath.Join(rfs.root, "/server")
+
+	g.Describe("SafePath", func() {
+		g.It("returns a cleaned path to a given file", func() {
+			p, err := fs.SafePath("test.txt")
+			g.Assert(err).IsNil()
+			g.Assert(p).Equal(prefix + "/test.txt")
+
+			p, err = fs.SafePath("/test.txt")
+			g.Assert(err).IsNil()
+			g.Assert(p).Equal(prefix + "/test.txt")
+
+			p, err = fs.SafePath("./test.txt")
+			g.Assert(err).IsNil()
+			g.Assert(p).Equal(prefix + "/test.txt")
+
+			p, err = fs.SafePath("/foo/../test.txt")
+			g.Assert(err).IsNil()
+			g.Assert(p).Equal(prefix + "/test.txt")
+
+			p, err = fs.SafePath("/foo/bar")
+			g.Assert(err).IsNil()
+			g.Assert(p).Equal(prefix + "/foo/bar")
+		})
+
+		g.It("handles root directory access", func() {
+			p, err := fs.SafePath("/")
+			g.Assert(err).IsNil()
+			g.Assert(p).Equal(prefix)
+
+			p, err = fs.SafePath("")
+			g.Assert(err).IsNil()
+			g.Assert(p).Equal(prefix)
+		})
+
+		g.It("removes trailing slashes from paths", func() {
+			p, err := fs.SafePath("/foo/bar/")
+			g.Assert(err).IsNil()
+			g.Assert(p).Equal(prefix + "/foo/bar")
+		})
+
+		g.It("handles deeply nested directories that do not exist", func() {
+			p, err := fs.SafePath("/foo/bar/baz/quaz/../../ducks/testing.txt")
+			g.Assert(err).IsNil()
+			g.Assert(p).Equal(prefix + "/foo/bar/ducks/testing.txt")
+		})
+
+		g.It("blocks access to files outside the root directory", func() {
+			p, err := fs.SafePath("../test.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+			g.Assert(p).Equal("")
+
+			p, err = fs.SafePath("/../test.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+			g.Assert(p).Equal("")
+
+			p, err = fs.SafePath("./foo/../../test.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+			g.Assert(p).Equal("")
+
+			p, err = fs.SafePath("..")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+			g.Assert(p).Equal("")
+		})
+	})
+}
+
+// We test against accessing files outside the root directory in the tests, however it
+// is still possible for someone to mess up and not properly use this safe path call. In
+// order to truly confirm this, we'll try to pass in a symlinked malicious file to all of
+// the calls and ensure they all fail with the same reason.
+func TestFilesystem_Blocks_Symlinks(t *testing.T) {
+	g := Goblin(t)
+	fs, rfs := NewFs()
+
+	if err := rfs.CreateServerFile("/../malicious.txt", "external content"); err != nil {
+		panic(err)
+	}
+
+	if err := os.Mkdir(filepath.Join(rfs.root, "/malicious_dir"), 0777); err != nil {
+		panic(err)
+	}
+
+	if err := os.Symlink(filepath.Join(rfs.root, "malicious.txt"), filepath.Join(rfs.root, "/server/symlinked.txt")); err != nil {
+		panic(err)
+	}
+
+	if err := os.Symlink(filepath.Join(rfs.root, "/malicious_dir"), filepath.Join(rfs.root, "/server/external_dir")); err != nil {
+		panic(err)
+	}
+
+	g.Describe("Readfile", func() {
+		g.It("cannot read a file symlinked outside the root", func() {
+			b := bytes.Buffer{}
+
+			err := fs.Readfile("symlinked.txt", &b)
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+	})
+
+	g.Describe("Writefile", func() {
+		g.It("cannot write to a file symlinked outside the root", func() {
+			r := bytes.NewReader([]byte("testing"))
+
+			err := fs.Writefile("symlinked.txt", r)
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("cannot write a file to a directory symlinked outside the root", func() {
+			r := bytes.NewReader([]byte("testing"))
+
+			err := fs.Writefile("external_dir/foo.txt", r)
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+	})
+
+	g.Describe("CreateDirectory", func() {
+		g.It("cannot create a directory outside the root", func() {
+			err := fs.CreateDirectory("my_dir", "external_dir")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("cannot create a nested directory outside the root", func() {
+			err := fs.CreateDirectory("my/nested/dir", "external_dir/foo/bar")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("cannot create a nested directory outside the root", func() {
+			err := fs.CreateDirectory("my/nested/dir", "external_dir/server")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+	})
+
+	g.Describe("Rename", func() {
+		g.It("cannot rename a file symlinked outside the directory root", func() {
+			err := fs.Rename("symlinked.txt", "foo.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("cannot rename a symlinked directory outside the root", func() {
+			err := fs.Rename("external_dir", "foo")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("cannot rename a file to a location outside the directory root", func() {
+			rfs.CreateServerFile("my_file.txt", "internal content")
+
+			err := fs.Rename("my_file.txt", "external_dir/my_file.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+	})
+
+	g.Describe("Chown", func() {
+		g.It("cannot chown a file symlinked outside the directory root", func() {
+			err := fs.Chown("symlinked.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("cannot chown a directory symlinked outside the directory root", func() {
+			err := fs.Chown("external_dir")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+	})
+
+	g.Describe("Copy", func() {
+		g.It("cannot copy a file symlinked outside the directory root", func() {
+			err := fs.Copy("symlinked.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+	})
+
+	g.Describe("Delete", func() {
+		g.It("deletes the symlinked file but leaves the source", func() {
+			err := fs.Delete("symlinked.txt")
+			g.Assert(err).IsNil()
+
+			_, err = os.Stat(filepath.Join(rfs.root, "malicious.txt"))
+			g.Assert(err).IsNil()
+
+			_, err = rfs.StatServerFile("symlinked.txt")
+			g.Assert(err).IsNotNil()
+			g.Assert(errors.Is(err, os.ErrNotExist)).IsTrue()
+		})
+	})
+
+	rfs.reset()
+}

server/filesystem/stat.go

@@ -0,0 +1,78 @@
+package filesystem
+
+import (
+	"encoding/json"
+	"github.com/gabriel-vasile/mimetype"
+	"os"
+	"strconv"
+	"time"
+)
+
+type Stat struct {
+	Info     os.FileInfo
+	Mimetype string
+}
+
+func (s *Stat) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Name      string `json:"name"`
+		Created   string `json:"created"`
+		Modified  string `json:"modified"`
+		Mode      string `json:"mode"`
+		ModeBits  string `json:"mode_bits"`
+		Size      int64  `json:"size"`
+		Directory bool   `json:"directory"`
+		File      bool   `json:"file"`
+		Symlink   bool   `json:"symlink"`
+		Mime      string `json:"mime"`
+	}{
+		Name:     s.Info.Name(),
+		Created:  s.CTime().Format(time.RFC3339),
+		Modified: s.Info.ModTime().Format(time.RFC3339),
+		Mode:     s.Info.Mode().String(),
+		// Using `&os.ModePerm` on the file's mode will cause the mode to only have the permission values, and nothing else.
+		ModeBits:  strconv.FormatUint(uint64(s.Info.Mode()&os.ModePerm), 8),
+		Size:      s.Info.Size(),
+		Directory: s.Info.IsDir(),
+		File:      !s.Info.IsDir(),
+		Symlink:   s.Info.Mode().Perm()&os.ModeSymlink != 0,
+		Mime:      s.Mimetype,
+	})
+}
+
+// Stats a file or folder and returns the base stat object from go along with the
+// MIME data that can be used for editing files.
+func (fs *Filesystem) Stat(p string) (*Stat, error) {
+	cleaned, err := fs.SafePath(p)
+	if err != nil {
+		return nil, err
+	}
+
+	return fs.unsafeStat(cleaned)
+}
+
+func (fs *Filesystem) unsafeStat(p string) (*Stat, error) {
+	s, err := os.Stat(p)
+	if err != nil {
+		return nil, err
+	}
+
+	var m *mimetype.MIME
+	if !s.IsDir() {
+		m, err = mimetype.DetectFile(p)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	st := &Stat{
+		Info:     s,
+		Mimetype: "inode/directory",
+	}
+
+	if m != nil {
+		st.Mimetype = m.String()
+	}
+
+	return st, nil
+}

server/filesystem/stat_darwin.go

@@ -1,4 +1,4 @@
-package server
+package filesystem
 
 import (
 	"syscall"
@@ -9,5 +9,5 @@ import (
 func (s *Stat) CTime() time.Time {
 	st := s.Info.Sys().(*syscall.Stat_t)
 
-	return time.Unix(int64(st.Ctim.Sec), int64(st.Ctim.Nsec))
-}
+	return time.Unix(st.Ctimespec.Sec, st.Ctimespec.Nsec)
+}

server/filesystem/stat_linux.go

@@ -0,0 +1,14 @@
+package filesystem
+
+import (
+	"syscall"
+	"time"
+)
+
+// Returns the time that the file/folder was created.
+func (s *Stat) CTime() time.Time {
+	st := s.Info.Sys().(*syscall.Stat_t)
+
+	// Do not remove these "redundant" type-casts, they are required for 32-bit builds to work.
+	return time.Unix(int64(st.Ctim.Sec), int64(st.Ctim.Nsec))
+}

server/filesystem/stat_windows.go

@@ -1,4 +1,4 @@
-package server
+package filesystem
 
 import (
 	"time"
@@ -9,4 +9,4 @@ import (
 // for right now.
 func (s *Stat) CTime() time.Time {
 	return s.Info.ModTime()
-}
+}

server/filesystem_darwin.go

@@ -1,13 +0,0 @@
-package server
-
-import (
-	"syscall"
-	"time"
-)
-
-// Returns the time that the file/folder was created.
-func (s *Stat) CTime() time.Time {
-	st := s.Info.Sys().(*syscall.Stat_t)
-
-	return time.Unix(int64(st.Ctimespec.Sec), int64(st.Ctimespec.Nsec))
-}

server/filesystem_walker.go

@@ -1,70 +0,0 @@
-package server
-
-import (
-	"context"
-	"golang.org/x/sync/errgroup"
-	"io/ioutil"
-	"os"
-	"path/filepath"
-)
-
-type FileWalker struct {
-	*Filesystem
-}
-
-// Returns a new walker instance.
-func (fs *Filesystem) NewWalker() *FileWalker {
-	return &FileWalker{fs}
-}
-
-// Iterate over all of the files and directories within a given directory. When a file is
-// found the callback will be called with the file information. If a directory is encountered
-// it will be recursively passed back through to this function.
-func (fw *FileWalker) Walk(dir string, ctx context.Context, callback func (os.FileInfo, string) bool) error {
-	cleaned, err := fw.SafePath(dir)
-	if err != nil {
-		return err
-	}
-
-	// Get all of the files from this directory.
-	files, err := ioutil.ReadDir(cleaned)
-	if err != nil {
-		return err
-	}
-
-	// Create an error group that we can use to run processes in parallel while retaining
-	// the ability to cancel the entire process immediately should any of it fail.
-	g, ctx := errgroup.WithContext(ctx)
-
-	for _, f := range files {
-		if f.IsDir() {
-			fi := f
-			p := filepath.Join(cleaned, f.Name())
-			// Recursively call this function to continue digging through the directory tree within
-			// a seperate goroutine. If the context is canceled abort this process.
-			g.Go(func() error {
-				select {
-				case <-ctx.Done():
-					return ctx.Err()
-				default:
-					// If the callback returns true, go ahead and keep walking deeper. This allows
-					// us to programatically continue deeper into directories, or stop digging
-					// if that pathway knows it needs nothing else.
-					if callback(fi, p) {
-						return fw.Walk(p, ctx, callback)
-					}
-
-					return nil
-				}
-			})
-		} else {
-			// If this isn't a directory, go ahead and pass the file information into the
-			// callback. We don't care about the response since we won't be stepping into
-			// anything from here.
-			callback(f, filepath.Join(cleaned, f.Name()))
-		}
-	}
-
-	// Block until all of the routines finish and have returned a value.
-	return g.Wait()
-}

server/install.go

@@ -4,77 +4,109 @@ import (
 	"bufio"
 	"bytes"
 	"context"
+	"emperror.dev/errors"
+	"github.com/apex/log"
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/mount"
 	"github.com/docker/docker/client"
-	"github.com/pkg/errors"
 	"github.com/pterodactyl/wings/api"
 	"github.com/pterodactyl/wings/config"
-	"go.uber.org/zap"
+	"github.com/pterodactyl/wings/environment"
+	"github.com/pterodactyl/wings/system"
+	"html/template"
 	"io"
-	"io/ioutil"
 	"os"
-	"path"
 	"path/filepath"
-	"sync"
+	"strconv"
+	"strings"
 )
 
 // Executes the installation stack for a server process. Bubbles any errors up to the calling
 // function which should handle contacting the panel to notify it of the server state.
-func (s *Server) Install() error {
-	err := s.internalInstall()
-
-	zap.S().Debugw("notifying panel of server install state", zap.String("server", s.Uuid))
-	if serr := s.SyncInstallState(err == nil); serr != nil {
-		zap.S().Warnw(
-			"failed to notify panel of server install state",
-			zap.String("server", s.Uuid),
-			zap.Bool("was_successful", err == nil),
-			zap.Error(serr),
-		)
+//
+// Pass true as the first argument in order to execute a server sync before the process to
+// ensure the latest information is used.
+func (s *Server) Install(sync bool) error {
+	if sync {
+		s.Log().Info("syncing server state with remote source before executing installation process")
+		if err := s.Sync(); err != nil {
+			return err
+		}
 	}
 
+	var err error
+	if !s.Config().SkipEggScripts {
+		// Send the start event so the Panel can automatically update. We don't send this unless the process
+		// is actually going to run, otherwise all sorts of weird rapid UI behavior happens since there isn't
+		// an actual install process being executed.
+		s.Events().Publish(InstallStartedEvent, "")
+
+		err = s.internalInstall()
+	} else {
+		s.Log().Info("server configured to skip running installation scripts for this egg, not executing process")
+	}
+
+	s.Log().Debug("notifying panel of server install state")
+	if serr := s.SyncInstallState(err == nil); serr != nil {
+		l := s.Log().WithField("was_successful", err == nil)
+
+		// If the request was successful but there was an error with this request, attach the
+		// error to this log entry. Otherwise ignore it in this log since whatever is calling
+		// this function should handle the error and will end up logging the same one.
+		if err == nil {
+			l.WithField("error", serr)
+		}
+
+		l.Warn("failed to notify panel of server install state")
+	}
+
+	// Ensure that the server is marked as offline at this point, otherwise you end up
+	// with a blank value which is a bit confusing.
+	s.Environment.SetState(environment.ProcessOfflineState)
+
+	// Push an event to the websocket so we can auto-refresh the information in the panel once
+	// the install is completed.
+	s.Events().Publish(InstallCompletedEvent, "")
+
 	return err
 }
 
 // Reinstalls a server's software by utilizing the install script for the server egg. This
 // does not touch any existing files for the server, other than what the script modifies.
 func (s *Server) Reinstall() error {
-	if s.GetState() != ProcessOfflineState {
-		zap.S().Debugw("waiting for server instance to enter a stopped state", zap.String("server", s.Uuid))
+	if s.Environment.State() != environment.ProcessOfflineState {
+		s.Log().Debug("waiting for server instance to enter a stopped state")
 		if err := s.Environment.WaitForStop(10, true); err != nil {
 			return err
 		}
 	}
 
-	return s.Install()
+	return s.Install(true)
 }
 
 // Internal installation function used to simplify reporting back to the Panel.
 func (s *Server) internalInstall() error {
-	script, rerr, err := api.NewRequester().GetInstallationScript(s.Uuid)
-	if err != nil || rerr != nil {
-		if err != nil {
+	script, err := api.New().GetInstallationScript(s.Id())
+	if err != nil {
+		if !api.IsRequestError(err) {
 			return err
 		}
 
-		return errors.New(rerr.String())
+		return errors.New(err.Error())
 	}
 
 	p, err := NewInstallationProcess(s, &script)
 	if err != nil {
-		return errors.WithStack(err)
+		return err
 	}
 
-	zap.S().Infow("beginning installation process for server", zap.String("server", s.Uuid))
-
+	s.Log().Info("beginning installation process for server")
 	if err := p.Run(); err != nil {
 		return err
 	}
 
-	zap.S().Infow("completed installation process for server", zap.String("server", s.Uuid))
-
+	s.Log().Info("completed installation process for server")
 	return nil
 }
 
@@ -82,8 +114,8 @@ type InstallationProcess struct {
 	Server *Server
 	Script *api.InstallationScript
 
-	client *client.Client
-	mutex  *sync.Mutex
+	client  *client.Client
+	context context.Context
 }
 
 // Generates a new installation process struct that will be used to create containers,
@@ -92,60 +124,99 @@ func NewInstallationProcess(s *Server, script *api.InstallationScript) (*Install
 	proc := &InstallationProcess{
 		Script: script,
 		Server: s,
-		mutex:  &sync.Mutex{},
 	}
 
-	if c, err := client.NewClientWithOpts(client.FromEnv); err != nil {
-		return nil, errors.WithStack(err)
+	if c, err := environment.DockerClient(); err != nil {
+		return nil, err
 	} else {
 		proc.client = c
+		proc.context = s.Context()
 	}
 
 	return proc, nil
 }
 
-// Runs the installation process, this is done as a backgrounded thread. This will configure
+// Determines if the server is actively running the installation process by checking the status
+// of the installer lock.
+func (s *Server) IsInstalling() bool {
+	return s.installing.Load()
+}
+
+func (s *Server) IsTransferring() bool {
+	return s.transferring.Load()
+}
+
+func (s *Server) SetTransferring(state bool) {
+	s.transferring.Store(state)
+}
+
+// Removes the installer container for the server.
+func (ip *InstallationProcess) RemoveContainer() error {
+	err := ip.client.ContainerRemove(ip.context, ip.Server.Id()+"_installer", types.ContainerRemoveOptions{
+		RemoveVolumes: true,
+		Force:         true,
+	})
+	if err != nil && !client.IsErrNotFound(err) {
+		return err
+	}
+	return nil
+}
+
+// Runs the installation process, this is done as in a background thread. This will configure
 // the required environment, and then spin up the installation container.
 //
 // Once the container finishes installing the results will be stored in an installation
 // log in the server's configuration directory.
 func (ip *InstallationProcess) Run() error {
-	installPath, err := ip.BeforeExecute()
-	if err != nil {
+	ip.Server.Log().Debug("acquiring installation process lock")
+	if !ip.Server.installing.SwapIf(true) {
+		return errors.New("install: cannot obtain installation lock")
+	}
+
+	// We now have an exclusive lock on this installation process. Ensure that whenever this
+	// process is finished that the semaphore is released so that other processes and be executed
+	// without encountering a wait timeout.
+	defer func() {
+		ip.Server.Log().Debug("releasing installation process lock")
+		ip.Server.installing.Store(false)
+	}()
+
+	if err := ip.BeforeExecute(); err != nil {
 		return err
 	}
 
-	cid, err := ip.Execute(installPath)
+	cid, err := ip.Execute()
 	if err != nil {
+		ip.RemoveContainer()
 		return err
 	}
 
 	// If this step fails, log a warning but don't exit out of the process. This is completely
 	// internal to the daemon's functionality, and does not affect the status of the server itself.
 	if err := ip.AfterExecute(cid); err != nil {
-		zap.S().Warnw("failed to complete after-execute step of installation process", zap.String("server", ip.Server.Uuid), zap.Error(err))
+		ip.Server.Log().WithField("error", err).Warn("failed to complete after-execute step of installation process")
 	}
 
 	return nil
 }
 
+// Returns the location of the temporary data for the installation process.
+func (ip *InstallationProcess) tempDir() string {
+	return filepath.Join(os.TempDir(), "pterodactyl/", ip.Server.Id())
+}
+
 // Writes the installation script to a temporary file on the host machine so that it
 // can be properly mounted into the installation container and then executed.
-func (ip *InstallationProcess) writeScriptToDisk() (string, error) {
+func (ip *InstallationProcess) writeScriptToDisk() error {
 	// Make sure the temp directory root exists before trying to make a directory within it. The
 	// ioutil.TempDir call expects this base to exist, it won't create it for you.
-	if err := os.MkdirAll(path.Join(os.TempDir(), "pterodactyl/"), 0700); err != nil {
-		return "", errors.WithStack(err)
+	if err := os.MkdirAll(ip.tempDir(), 0700); err != nil {
+		return errors.WithMessage(err, "could not create temporary directory for install process")
 	}
 
-	d, err := ioutil.TempDir("", "pterodactyl/")
+	f, err := os.OpenFile(filepath.Join(ip.tempDir(), "install.sh"), os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
 	if err != nil {
-		return "", errors.WithStack(err)
-	}
-
-	f, err := os.OpenFile(filepath.Join(d, "install.sh"), os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
-	if err != nil {
-		return "", errors.WithStack(err)
+		return errors.WithMessage(err, "failed to write server installation script to disk before mount")
 	}
 	defer f.Close()
 
@@ -157,29 +228,80 @@ func (ip *InstallationProcess) writeScriptToDisk() (string, error) {
 	}
 
 	if err := scanner.Err(); err != nil {
-		return "", errors.WithStack(err)
+		return err
 	}
 
 	w.Flush()
 
-	return d, nil
+	return nil
 }
 
 // Pulls the docker image to be used for the installation container.
 func (ip *InstallationProcess) pullInstallationImage() error {
-	r, err := ip.client.ImagePull(context.Background(), ip.Script.ContainerImage, types.ImagePullOptions{})
-	if err != nil {
-		return errors.WithStack(err)
+	// Get a registry auth configuration from the config.
+	var registryAuth *config.RegistryConfiguration
+	for registry, c := range config.Get().Docker.Registries {
+		if !strings.HasPrefix(ip.Script.ContainerImage, registry) {
+			continue
+		}
+
+		log.WithField("registry", registry).Debug("using authentication for registry")
+		registryAuth = &c
+		break
 	}
 
+	// Get the ImagePullOptions.
+	imagePullOptions := types.ImagePullOptions{All: false}
+	if registryAuth != nil {
+		b64, err := registryAuth.Base64()
+		if err != nil {
+			log.WithError(err).Error("failed to get registry auth credentials")
+		}
+
+		// b64 is a string so if there is an error it will just be empty, not nil.
+		imagePullOptions.RegistryAuth = b64
+	}
+
+	r, err := ip.client.ImagePull(context.Background(), ip.Script.ContainerImage, imagePullOptions)
+	if err != nil {
+		images, ierr := ip.client.ImageList(context.Background(), types.ImageListOptions{})
+		if ierr != nil {
+			// Well damn, something has gone really wrong here, just go ahead and abort there
+			// isn't much anything we can do to try and self-recover from this.
+			return ierr
+		}
+
+		for _, img := range images {
+			for _, t := range img.RepoTags {
+				if t != ip.Script.ContainerImage {
+					continue
+				}
+
+				log.WithFields(log.Fields{
+					"image": ip.Script.ContainerImage,
+					"err":   err.Error(),
+				}).Warn("unable to pull requested image from remote source, however the image exists locally")
+
+				// Okay, we found a matching container image, in that case just go ahead and return
+				// from this function, since there is nothing else we need to do here.
+				return nil
+			}
+		}
+
+		return err
+	}
+	defer r.Close()
+
+	log.WithField("image", ip.Script.ContainerImage).Debug("pulling docker image... this could take a bit of time")
+
 	// Block continuation until the image has been pulled successfully.
 	scanner := bufio.NewScanner(r)
 	for scanner.Scan() {
-		zap.S().Debugw(scanner.Text())
+		log.Debug(scanner.Text())
 	}
 
 	if err := scanner.Err(); err != nil {
-		return errors.WithStack(err)
+		return err
 	}
 
 	return nil
@@ -188,114 +310,93 @@ func (ip *InstallationProcess) pullInstallationImage() error {
 // Runs before the container is executed. This pulls down the required docker container image
 // as well as writes the installation script to the disk. This process is executed in an async
 // manner, if either one fails the error is returned.
-func (ip *InstallationProcess) BeforeExecute() (string, error) {
-	wg := sync.WaitGroup{}
-	wg.Add(3)
-
-	var e []error
-	var fileName string
-
-	go func() {
-		defer wg.Done()
-		name, err := ip.writeScriptToDisk()
-		if err != nil {
-			e = append(e, err)
-			return
-		}
-
-		fileName = name
-	}()
-
-	go func() {
-		defer wg.Done()
-		if err := ip.pullInstallationImage(); err != nil {
-			e = append(e, err)
-		}
-	}()
-
-	go func() {
-		defer wg.Done()
-
-		opts := types.ContainerRemoveOptions{
-			RemoveVolumes: true,
-			Force:         true,
-		}
-
-		if err := ip.client.ContainerRemove(context.Background(), ip.Server.Uuid+"_installer", opts); err != nil {
-			if !client.IsErrNotFound(err) {
-				e = append(e, err)
-			}
-		}
-	}()
-
-	wg.Wait()
-
-	// Maybe a better way to handle this, but if there is at least one error
-	// just bail out of the process now.
-	if len(e) > 0 {
-		return "", errors.WithStack(e[0])
+func (ip *InstallationProcess) BeforeExecute() error {
+	if err := ip.writeScriptToDisk(); err != nil {
+		return errors.WithMessage(err, "failed to write installation script to disk")
 	}
-
-	return fileName, nil
+	if err := ip.pullInstallationImage(); err != nil {
+		return errors.WithMessage(err, "failed to pull updated installation container image for server")
+	}
+	if err := ip.RemoveContainer(); err != nil {
+		return errors.WithMessage(err, "failed to remove existing install container for server")
+	}
+	return nil
 }
 
 // Returns the log path for the installation process.
 func (ip *InstallationProcess) GetLogPath() string {
-	return filepath.Join(config.Get().System.GetInstallLogPath(), ip.Server.Uuid+".log")
+	return filepath.Join(config.Get().System.GetInstallLogPath(), ip.Server.Id()+".log")
 }
 
 // Cleans up after the execution of the installation process. This grabs the logs from the
 // process to store in the server configuration directory, and then destroys the associated
 // installation container.
 func (ip *InstallationProcess) AfterExecute(containerId string) error {
-	ctx := context.Background()
+	defer ip.RemoveContainer()
 
-	zap.S().Debugw("pulling installation logs for server", zap.String("server", ip.Server.Uuid), zap.String("container_id", containerId))
-	reader, err := ip.client.ContainerLogs(ctx, containerId, types.ContainerLogsOptions{
+	ip.Server.Log().WithField("container_id", containerId).Debug("pulling installation logs for server")
+	reader, err := ip.client.ContainerLogs(ip.context, containerId, types.ContainerLogsOptions{
 		ShowStdout: true,
 		ShowStderr: true,
 		Follow:     false,
 	})
 
 	if err != nil && !client.IsErrNotFound(err) {
-		return errors.WithStack(err)
+		return err
 	}
 
 	f, err := os.OpenFile(ip.GetLogPath(), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
 	if err != nil {
-		return errors.WithStack(err)
+		return err
 	}
 	defer f.Close()
 
 	// We write the contents of the container output to a more "permanent" file so that they
-	// can be referenced after this container is deleted.
-	if _, err := io.Copy(f, reader); err != nil {
-		return errors.WithStack(err)
+	// can be referenced after this container is deleted. We'll also include the environment
+	// variables passed into the container to make debugging things a little easier.
+	ip.Server.Log().WithField("path", ip.GetLogPath()).Debug("writing most recent installation logs to disk")
+
+	tmpl, err := template.New("header").Parse(`Pterodactyl Server Installation Log
+
+|
+| Details
+| ------------------------------
+  Server UUID:          {{.Server.Id}}
+  Container Image:      {{.Script.ContainerImage}}
+  Container Entrypoint: {{.Script.Entrypoint}}
+
+|
+| Environment Variables
+| ------------------------------
+{{ range $key, $value := .Server.GetEnvironmentVariables }}  {{ $value }}
+{{ end }}
+
+|
+| Script Output
+| ------------------------------
+`)
+	if err != nil {
+		return err
 	}
 
-	zap.S().Debugw("removing server installation container", zap.String("server", ip.Server.Uuid), zap.String("container_id", containerId))
-	rErr := ip.client.ContainerRemove(ctx, containerId, types.ContainerRemoveOptions{
-		RemoveVolumes: true,
-		RemoveLinks:   false,
-		Force:         true,
-	})
+	if err := tmpl.Execute(f, ip); err != nil {
+		return err
+	}
 
-	if rErr != nil && !client.IsErrNotFound(rErr) {
-		return errors.WithStack(rErr)
+	if _, err := io.Copy(f, reader); err != nil {
+		return err
 	}
 
 	return nil
 }
 
 // Executes the installation process inside a specially created docker container.
-func (ip *InstallationProcess) Execute(installPath string) (string, error) {
-	ctx := context.Background()
-
-	zap.S().Debugw(
-		"creating server installer container",
-		zap.String("server", ip.Server.Uuid),
-		zap.String("script_path", installPath+"/install.sh"),
-	)
+func (ip *InstallationProcess) Execute() (string, error) {
+	// Create a child context that is canceled once this function is done running. This
+	// will also be canceled if the parent context (from the Server struct) is canceled
+	// which occurs if the server is deleted.
+	ctx, cancel := context.WithCancel(ip.context)
+	defer cancel()
 
 	conf := &container.Config{
 		Hostname:     "installer",
@@ -304,7 +405,7 @@ func (ip *InstallationProcess) Execute(installPath string) (string, error) {
 		AttachStdin:  true,
 		OpenStdin:    true,
 		Tty:          true,
-		Cmd:          []string{ip.Script.Entrypoint, "./mnt/install/install.sh"},
+		Cmd:          []string{ip.Script.Entrypoint, "/mnt/install/install.sh"},
 		Image:        ip.Script.ContainerImage,
 		Env:          ip.Server.GetEnvironmentVariables(),
 		Labels: map[string]string{
@@ -313,25 +414,26 @@ func (ip *InstallationProcess) Execute(installPath string) (string, error) {
 		},
 	}
 
+	tmpfsSize := strconv.Itoa(int(config.Get().Docker.TmpfsSize))
 	hostConf := &container.HostConfig{
 		Mounts: []mount.Mount{
 			{
 				Target:   "/mnt/server",
-				Source:   ip.Server.Filesystem.Path(),
+				Source:   ip.Server.Filesystem().Path(),
 				Type:     mount.TypeBind,
 				ReadOnly: false,
 			},
 			{
 				Target:   "/mnt/install",
-				Source:   installPath,
+				Source:   ip.tempDir(),
 				Type:     mount.TypeBind,
 				ReadOnly: false,
 			},
 		},
 		Tmpfs: map[string]string{
-			"/tmp": "rw,exec,nosuid,size=50M",
+			"/tmp": "rw,exec,nosuid,size=" + tmpfsSize + "M",
 		},
-		DNS: []string{"1.1.1.1", "8.8.8.8"},
+		DNS: config.Get().Docker.Network.Dns,
 		LogConfig: container.LogConfig{
 			Type: "local",
 			Config: map[string]string{
@@ -341,43 +443,51 @@ func (ip *InstallationProcess) Execute(installPath string) (string, error) {
 			},
 		},
 		Privileged:  true,
-		NetworkMode: "pterodactyl_nw",
+		NetworkMode: container.NetworkMode(config.Get().Docker.Network.Mode),
 	}
 
-	zap.S().Infow("creating installer container for server process", zap.String("server", ip.Server.Uuid))
-	r, err := ip.client.ContainerCreate(ctx, conf, hostConf, nil, ip.Server.Uuid+"_installer")
+	ip.Server.Log().WithField("install_script", ip.tempDir()+"/install.sh").Info("creating install container for server process")
+	// Remove the temporary directory when the installation process finishes for this server container.
+	defer func() {
+		if err := os.RemoveAll(ip.tempDir()); err != nil {
+			if !os.IsNotExist(err) {
+				ip.Server.Log().WithField("error", err).Warn("failed to remove temporary data directory after install process")
+			}
+		}
+	}()
+
+	r, err := ip.client.ContainerCreate(ctx, conf, hostConf, nil, nil, ip.Server.Id()+"_installer")
 	if err != nil {
-		return "", errors.WithStack(err)
+		return "", err
 	}
 
-	zap.S().Infow(
-		"running installation script for server in container",
-		zap.String("server", ip.Server.Uuid),
-		zap.String("container_id", r.ID),
-	)
+	ip.Server.Log().WithField("container_id", r.ID).Info("running installation script for server in container")
 	if err := ip.client.ContainerStart(ctx, r.ID, types.ContainerStartOptions{}); err != nil {
 		return "", err
 	}
 
+	// Process the install event in the background by listening to the stream output until the
+	// container has stopped, at which point we'll disconnect from it.
+	//
+	// If there is an error during the streaming output just report it and do nothing else, the
+	// install can still run, the console just won't have any output.
 	go func(id string) {
 		ip.Server.Events().Publish(DaemonMessageEvent, "Starting installation process, this could take a few minutes...")
-		if err := ip.StreamOutput(id); err != nil {
-			zap.S().Errorw(
-				"error handling streaming output for server install process",
-				zap.String("container_id", id),
-				zap.Error(err),
-			)
+		if err := ip.StreamOutput(ctx, id); err != nil {
+			ip.Server.Log().WithField("error", err).Warn("error connecting to server install stream output")
 		}
-		ip.Server.Events().Publish(DaemonMessageEvent, "Installation process completed.")
 	}(r.ID)
 
-	sChann, eChann := ip.client.ContainerWait(ctx, r.ID, container.WaitConditionNotRunning)
+	sChan, eChan := ip.client.ContainerWait(ctx, r.ID, container.WaitConditionNotRunning)
 	select {
-	case err := <-eChann:
-		if err != nil {
-			return "", errors.WithStack(err)
+	case err := <-eChan:
+		// Once the container has stopped running we can mark the install process as being completed.
+		if err == nil {
+			ip.Server.Events().Publish(DaemonMessageEvent, "Installation process completed.")
+		} else {
+			return "", err
 		}
-	case <-sChann:
+	case <-sChan:
 	}
 
 	return r.ID, nil
@@ -386,33 +496,25 @@ func (ip *InstallationProcess) Execute(installPath string) (string, error) {
 // Streams the output of the installation process to a log file in the server configuration
 // directory, as well as to a websocket listener so that the process can be viewed in
 // the panel by administrators.
-func (ip *InstallationProcess) StreamOutput(id string) error {
-	reader, err := ip.client.ContainerLogs(context.Background(), id, types.ContainerLogsOptions{
+func (ip *InstallationProcess) StreamOutput(ctx context.Context, id string) error {
+	reader, err := ip.client.ContainerLogs(ctx, id, types.ContainerLogsOptions{
 		ShowStdout: true,
 		ShowStderr: true,
 		Follow:     true,
 	})
 
 	if err != nil {
-		return errors.WithStack(err)
+		return err
 	}
-
 	defer reader.Close()
 
-	s := bufio.NewScanner(reader)
-	for s.Scan() {
-		ip.Server.Events().Publish(InstallOutputEvent, s.Text())
+	evts := ip.Server.Events()
+	err = system.ScanReader(reader, func(line string) {
+		evts.Publish(InstallOutputEvent, line)
+	})
+	if err != nil {
+		ip.Server.Log().WithFields(log.Fields{"container_id": id, "error": err}).Warn("error processing install output lines")
 	}
-
-	if err := s.Err(); err != nil {
-		zap.S().Warnw(
-			"error processing scanner line in installation output for server",
-			zap.String("server", ip.Server.Uuid),
-			zap.String("container_id", id),
-			zap.Error(errors.WithStack(err)),
-		)
-	}
-
 	return nil
 }
 
@@ -421,15 +523,13 @@ func (ip *InstallationProcess) StreamOutput(id string) error {
 // value of "true" means everything was successful, "false" means something went
 // wrong and the server must be deleted and re-created.
 func (s *Server) SyncInstallState(successful bool) error {
-	r := api.NewRequester()
-
-	rerr, err := r.SendInstallationStatus(s.Uuid, successful)
-	if rerr != nil || err != nil {
-		if err != nil {
-			return errors.WithStack(err)
+	err := api.New().SendInstallationStatus(s.Id(), successful)
+	if err != nil {
+		if !api.IsRequestError(err) {
+			return err
 		}
 
-		return errors.New(rerr.String())
+		return errors.New(err.Error())
 	}
 
 	return nil