Bump version to v0.6.0

Signed-off-by: Sumner Evans <sumner@beeper.com>

.github/workflows/go.yml

@@ -5,17 +5,13 @@ on: [push, pull_request]
 jobs:
   lint:
     runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        go-version: [1.19]
     steps:
       - uses: actions/checkout@v3
 
-      - name: Set up Go ${{ matrix.go-version }}
+      - name: Set up Go
         uses: actions/setup-go@v3
         with:
-          go-version: ${{ matrix.go-version }}
+          go-version: "1.20"
 
       - name: Install libolm
         run: sudo apt-get install libolm-dev libolm3

.gitignore

@@ -1,5 +1,6 @@
-config.yaml
-discord
-logs/
-registration.yaml
+*.yaml
+!example-config.yaml
+!.pre-commit-config.yaml
+
 *.db*
+*.log*

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.1.0
+    rev: v4.4.0
     hooks:
       - id: trailing-whitespace
         exclude_types: [markdown]
@@ -9,7 +9,7 @@ repos:
       - id: check-added-large-files
 
   - repo: https://github.com/tekwizely/pre-commit-golang
-    rev: v1.0.0-beta.5
+    rev: v1.0.0-rc.1
     hooks:
       - id: go-imports-repo
       - id: go-vet-repo-mod

CHANGELOG.md

@@ -1,3 +1,100 @@
+# v0.6.0 (2023-07-16)
+
+* Added initial support for backfilling threads.
+* Exposed `Application` flag to displayname template.
+* Changed `m.emote` bridging to use italics on Discord.
+* Updated Docker image to Alpine 3.18.
+* Added limit to parallel media transfers to avoid high memory usage if lots
+  of messages are received at the same time.
+* Fixed guilds being unbridged if Discord has server issues and temporarily
+  marks a guild as unavailable.
+* Fixed using `guilds bridge` command without `--entire` flag.
+* Fixed panic if lottieconverter isn't installed.
+* Fixed relay webhook secret being leaked in network error messages.
+
+# v0.5.0 (2023-06-16)
+
+* Added support for intentional mentions in Matrix (MSC3952).
+* Added `GlobalName` variable to displayname templates and updated the default
+  template to prefer it over usernames.
+* Added `Webhook` variable to displayname templates to allow determining if a
+  ghost user is a webhook.
+* Added guild profiles and webhook profiles as a custom field in Matrix
+  message events.
+* Added support for bulk message delete from Discord.
+* Added support for appservice websockets.
+* Enabled parsing headers (`#`) in Discord markdown.
+* Messages that consist of a single image link are now bridged as images to
+  closer match Discord.
+* Stopped bridging incoming typing notifications from users who are logged into
+  the bridge to prevent echoes.
+
+# v0.4.0 (2023-05-16)
+
+* Added bridging of friend nicks into DM room names.
+* Added option to bypass homeserver for Discord media.
+  See [docs](https://docs.mau.fi/bridges/go/discord/direct-media.html) for more info.
+* Added conversion of replies to embeds when sending messages via webhook.
+* Added option to disable caching reuploaded media. This may be necessary when
+  using a media repo that doesn't create a unique mxc URI for each upload.
+* Added option to disable uploading files directly to the Discord CDN
+  (and send as form parts in the message send request instead).
+* Improved formatting of error messages returned by Discord.
+* Enabled discordgo info logs by default.
+* Fixed limited backfill always stopping after 50 messages
+  (thanks to [@odrling] in [#81]).
+* Fixed startup sync to sync most recent private channels first.
+* Fixed syncing group DM participants when they change.
+* Fixed bridging animated emojis in messages.
+* Stopped handling all message edits from relay webhook to prevent incorrect
+  edits.
+* Possibly fixed inviting to portal rooms when multiple Matrix users use the
+  bridge.
+
+[@odrling]: https://github.com/odrling
+[#81]: https://github.com/mautrix/discord/pull/81
+
+# v0.3.0 (2023-04-16)
+
+* Added support for backfilling on room creation and missed messages on startup.
+* Added options to automatically ratchet/delete megolm sessions to minimize
+  access to old messages.
+* Added basic support for incoming voice messages.
+
+# v0.2.0 (2023-03-16)
+
+* Switched to zerolog for logging.
+  * The basic log config will be migrated automatically, but you may want to
+    tweak it as the options are different.
+* Added support for logging in with a bot account.
+  The [Authentication docs](https://docs.mau.fi/bridges/go/discord/authentication.html)
+  have been updated with instructions for creating a bot.
+* Added support for relaying messages for unauthenticated users using a webhook.
+  See [docs](https://docs.mau.fi/bridges/go/discord/relay.html) for instructions.
+* Added commands to bridge and unbridge channels manually.
+* Added `ping` command.
+* Added support for gif stickers from Discord.
+* Changed mention bridging so mentions for users logged into the bridge use the
+  Matrix user's MXID even if double puppeting is not enabled.
+* Actually fixed ghost user info not being synced when receiving reactions.
+* Fixed uncommon bug with sending messages that only occurred after login
+  before restarting the bridge.
+* Fixed guild name not being synced immediately after joining a new guild.
+* Fixed variation selectors when bridging emojis to Discord.
+
+# v0.1.1 (2023-02-16)
+
+* Started automatically subscribing to bridged guilds. This fixes two problems:
+  * Typing notifications should now work automatically in guilds.
+  * Huge guilds now actually get messages bridged.
+* Added support for converting animated lottie stickers to raster formats using
+  [lottieconverter](https://github.com/sot-tech/LottieConverter).
+* Added basic bridging for call start and guild join messages.
+* Improved markdown parsing to disable more features that don't exist on Discord.
+* Removed width from inline images (e.g. in the `guilds status` output) to
+  handle non-square images properly.
+* Fixed ghost user info not being synced when receiving reactions.
+
 # v0.1.0 (2023-01-29)
 
 Initial release.

Dockerfile

@@ -1,4 +1,6 @@
-FROM golang:1-alpine3.17 AS builder
+FROM dock.mau.dev/tulir/lottieconverter:alpine-3.18 AS lottie
+
+FROM golang:1-alpine3.18 AS builder
 
 RUN apk add --no-cache git ca-certificates build-base su-exec olm-dev
 
@@ -6,13 +8,16 @@ COPY . /build
 WORKDIR /build
 RUN go build -o /usr/bin/mautrix-discord
 
-FROM alpine:3.17
+FROM alpine:3.18
 
 ENV UID=1337 \
     GID=1337
 
-RUN apk add --no-cache ffmpeg su-exec ca-certificates olm bash jq yq curl
+RUN apk add --no-cache ffmpeg su-exec ca-certificates olm bash jq yq curl \
+    zlib libpng giflib libstdc++ libgcc
 
+COPY --from=lottie /usr/lib/librlottie.so* /usr/lib/
+COPY --from=lottie /usr/local/bin/lottieconverter /usr/local/bin/lottieconverter
 COPY --from=builder /usr/bin/mautrix-discord /usr/bin/mautrix-discord
 COPY --from=builder /build/example-config.yaml /opt/mautrix-discord/example-config.yaml
 COPY --from=builder /build/docker-run.sh /docker-run.sh

Dockerfile.ci

@@ -1,10 +1,15 @@
-FROM alpine:3.17
+FROM dock.mau.dev/tulir/lottieconverter:alpine-3.18 AS lottie
+
+FROM alpine:3.18
 
 ENV UID=1337 \
     GID=1337
 
-RUN apk add --no-cache ffmpeg su-exec ca-certificates bash jq curl yq
+RUN apk add --no-cache ffmpeg su-exec ca-certificates bash jq curl yq \
+    zlib libpng giflib libstdc++ libgcc
 
+COPY --from=lottie /usr/lib/librlottie.so* /usr/lib/
+COPY --from=lottie /usr/local/bin/lottieconverter /usr/local/bin/lottieconverter
 ARG EXECUTABLE=./mautrix-discord
 COPY $EXECUTABLE /usr/bin/mautrix-discord
 COPY ./example-config.yaml /opt/mautrix-discord/example-config.yaml

Dockerfile.dev

@@ -1,7 +1,12 @@
-FROM golang:1-alpine3.17 AS builder
+FROM dock.mau.dev/tulir/lottieconverter:alpine-3.18 AS lottie
 
-RUN apk add --no-cache git ca-certificates build-base su-exec olm-dev bash jq yq curl
+FROM golang:1-alpine3.18 AS builder
 
+RUN apk add --no-cache git ca-certificates build-base su-exec olm-dev bash jq yq curl \
+    zlib libpng giflib libstdc++ libgcc
+
+COPY --from=lottie /usr/lib/librlottie.so* /usr/lib/
+COPY --from=lottie /usr/local/bin/lottieconverter /usr/local/bin/lottieconverter
 COPY . /build
 WORKDIR /build
 RUN go build -o /usr/bin/mautrix-discord

README.md

@@ -8,7 +8,8 @@ All setup and usage instructions are located on [docs.mau.fi]. Some quick links:
 
 * [Bridge setup](https://docs.mau.fi/bridges/go/setup.html?bridge=discord)
   (or [with Docker](https://docs.mau.fi/bridges/general/docker-setup.html?bridge=discord))
-* Basic usage: [Authentication](https://docs.mau.fi/bridges/go/discord/authentication.html)
+* Basic usage: [Authentication](https://docs.mau.fi/bridges/go/discord/authentication.html),
+  [Relaying with webhooks](https://docs.mau.fi/bridges/go/discord/relay.html)
 
 ### Features & Roadmap
 [ROADMAP.md](https://github.com/mautrix/discord/blob/main/ROADMAP.md)

attachments.go

@@ -2,11 +2,18 @@ package main
 
 import (
 	"bytes"
+	"context"
+	"errors"
 	"fmt"
 	"image"
 	"io"
 	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strconv"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/bwmarrin/discordgo"
@@ -16,11 +23,14 @@ import (
 	"maunium.net/go/mautrix/appservice"
 	"maunium.net/go/mautrix/crypto/attachment"
 	"maunium.net/go/mautrix/event"
+	"maunium.net/go/mautrix/id"
+	"maunium.net/go/mautrix/util"
+	"maunium.net/go/mautrix/util/ffmpeg"
 
 	"go.mau.fi/mautrix-discord/database"
 )
 
-func downloadDiscordAttachment(url string) ([]byte, error) {
+func downloadDiscordAttachment(url string, maxSize int64) ([]byte, error) {
 	req, err := http.NewRequest(http.MethodGet, url, nil)
 	if err != nil {
 		return nil, err
@@ -36,9 +46,24 @@ func downloadDiscordAttachment(url string) ([]byte, error) {
 	defer resp.Body.Close()
 	if resp.StatusCode > 300 {
 		data, _ := io.ReadAll(resp.Body)
-		return nil, fmt.Errorf("unexpected status %d: %s", resp.StatusCode, data)
+		return nil, fmt.Errorf("unexpected status %d downloading %s: %s", resp.StatusCode, url, data)
+	}
+	if resp.Header.Get("Content-Length") != "" {
+		length, err := strconv.ParseInt(resp.Header.Get("Content-Length"), 10, 64)
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse content length: %w", err)
+		} else if length > maxSize {
+			return nil, fmt.Errorf("attachment too large (%d > %d)", length, maxSize)
+		}
+		return io.ReadAll(resp.Body)
+	} else {
+		var mbe *http.MaxBytesError
+		data, err := io.ReadAll(http.MaxBytesReader(nil, resp.Body, maxSize))
+		if err != nil && errors.As(err, &mbe) {
+			return nil, fmt.Errorf("attachment too large (over %d)", maxSize)
+		}
+		return data, err
 	}
-	return io.ReadAll(resp.Body)
 }
 
 func uploadDiscordAttachment(url string, data []byte) error {
@@ -62,7 +87,7 @@ func uploadDiscordAttachment(url string, data []byte) error {
 	return nil
 }
 
-func (portal *Portal) downloadMatrixAttachment(content *event.MessageEventContent) ([]byte, error) {
+func downloadMatrixAttachment(intent *appservice.IntentAPI, content *event.MessageEventContent) ([]byte, error) {
 	var file *event.EncryptedFileInfo
 	rawMXC := content.URL
 
@@ -76,7 +101,7 @@ func (portal *Portal) downloadMatrixAttachment(content *event.MessageEventConten
 		return nil, err
 	}
 
-	data, err := portal.MainIntent().DownloadBytes(mxc)
+	data, err := intent.DownloadBytes(mxc)
 	if err != nil {
 		return nil, err
 	}
@@ -91,23 +116,24 @@ func (portal *Portal) downloadMatrixAttachment(content *event.MessageEventConten
 	return data, nil
 }
 
-func (br *DiscordBridge) uploadMatrixAttachment(intent *appservice.IntentAPI, data []byte, url string, encrypt bool, attachmentID, mime string) (*database.File, error) {
+func (br *DiscordBridge) uploadMatrixAttachment(intent *appservice.IntentAPI, data []byte, url string, encrypt bool, meta AttachmentMeta, semaWg *sync.WaitGroup) (*database.File, error) {
 	dbFile := br.DB.File.New()
 	dbFile.Timestamp = time.Now()
 	dbFile.URL = url
-	dbFile.ID = attachmentID
+	dbFile.ID = meta.AttachmentID
+	dbFile.EmojiName = meta.EmojiName
 	dbFile.Size = len(data)
 	dbFile.MimeType = mimetype.Detect(data).String()
-	if mime == "" {
-		mime = dbFile.MimeType
+	if meta.MimeType == "" {
+		meta.MimeType = dbFile.MimeType
 	}
-	if strings.HasPrefix(mime, "image/") {
+	if strings.HasPrefix(meta.MimeType, "image/") {
 		cfg, _, _ := image.DecodeConfig(bytes.NewReader(data))
 		dbFile.Width = cfg.Width
 		dbFile.Height = cfg.Height
 	}
 
-	uploadMime := mime
+	uploadMime := meta.MimeType
 	if encrypt {
 		dbFile.Encrypted = true
 		dbFile.DecryptionInfo = attachment.NewEncryptedFile()
@@ -119,17 +145,19 @@ func (br *DiscordBridge) uploadMatrixAttachment(intent *appservice.IntentAPI, da
 		ContentType:  uploadMime,
 	}
 	if br.Config.Homeserver.AsyncMedia {
-		resp, err := intent.UnstableCreateMXC()
+		resp, err := intent.CreateMXC()
 		if err != nil {
 			return nil, err
 		}
 		dbFile.MXC = resp.ContentURI
-		req.UnstableMXC = resp.ContentURI
-		req.UploadURL = resp.UploadURL
+		req.MXC = resp.ContentURI
+		req.UnstableUploadURL = resp.UnstableUploadURL
+		semaWg.Add(1)
 		go func() {
+			defer semaWg.Done()
 			_, err = intent.UploadMedia(req)
 			if err != nil {
-				br.Log.Errorfln("Failed to upload %s: %v", req.UnstableMXC, err)
+				br.Log.Errorfln("Failed to upload %s: %v", req.MXC, err)
 				dbFile.Delete()
 			}
 		}()
@@ -140,22 +168,184 @@ func (br *DiscordBridge) uploadMatrixAttachment(intent *appservice.IntentAPI, da
 		}
 		dbFile.MXC = uploaded.ContentURI
 	}
-	dbFile.Insert(nil)
 	return dbFile, nil
 }
 
-func (br *DiscordBridge) copyAttachmentToMatrix(intent *appservice.IntentAPI, url string, encrypt bool, attachmentID, mime string) (*database.File, error) {
-	dbFile := br.DB.File.Get(url, encrypt)
-	if dbFile == nil {
-		data, err := downloadDiscordAttachment(url)
-		if err != nil {
-			return nil, err
-		}
+type AttachmentMeta struct {
+	AttachmentID  string
+	MimeType      string
+	EmojiName     string
+	CopyIfMissing bool
+	Converter     func([]byte) ([]byte, string, error)
+}
 
-		dbFile, err = br.uploadMatrixAttachment(intent, data, url, encrypt, attachmentID, mime)
-		if err != nil {
-			return nil, err
-		}
+var NoMeta = AttachmentMeta{}
+
+type attachmentKey struct {
+	URL     string
+	Encrypt bool
+}
+
+func (br *DiscordBridge) convertLottie(data []byte) ([]byte, string, error) {
+	fps := br.Config.Bridge.AnimatedSticker.Args.FPS
+	width := br.Config.Bridge.AnimatedSticker.Args.Width
+	height := br.Config.Bridge.AnimatedSticker.Args.Height
+	target := br.Config.Bridge.AnimatedSticker.Target
+	var lottieTarget, outputMime string
+	switch target {
+	case "png":
+		lottieTarget = "png"
+		outputMime = "image/png"
+		fps = 1
+	case "gif":
+		lottieTarget = "gif"
+		outputMime = "image/gif"
+	case "webm":
+		lottieTarget = "pngs"
+		outputMime = "video/webm"
+	case "webp":
+		lottieTarget = "pngs"
+		outputMime = "image/webp"
+	case "disable":
+		return data, "application/json", nil
+	default:
+		return nil, "", fmt.Errorf("invalid animated sticker target %q in bridge config", br.Config.Bridge.AnimatedSticker.Target)
 	}
-	return dbFile, nil
+
+	ctx := context.Background()
+	tempdir, err := os.MkdirTemp("", "mautrix_discord_lottie_")
+	if err != nil {
+		return nil, "", fmt.Errorf("failed to create temp dir: %w", err)
+	}
+	defer func() {
+		removErr := os.RemoveAll(tempdir)
+		if removErr != nil {
+			br.Log.Warnfln("Failed to delete lottie conversion temp dir: %v", removErr)
+		}
+	}()
+
+	lottieOutput := filepath.Join(tempdir, "out_")
+	if lottieTarget != "pngs" {
+		lottieOutput = filepath.Join(tempdir, "output."+lottieTarget)
+	}
+	cmd := exec.CommandContext(ctx, "lottieconverter", "-", lottieOutput, lottieTarget, fmt.Sprintf("%dx%d", width, height), strconv.Itoa(fps))
+	cmd.Stdin = bytes.NewReader(data)
+	err = cmd.Run()
+	if err != nil {
+		return nil, "", fmt.Errorf("failed to run lottieconverter: %w", err)
+	}
+	var path string
+	if lottieTarget == "pngs" {
+		var videoCodec string
+		outputExtension := "." + target
+		if target == "webm" {
+			videoCodec = "libvpx-vp9"
+		} else if target == "webp" {
+			videoCodec = "libwebp_anim"
+		} else {
+			panic(fmt.Errorf("impossible case: unknown target %q", target))
+		}
+		path, err = ffmpeg.ConvertPath(
+			ctx, lottieOutput+"*.png", outputExtension,
+			[]string{"-framerate", strconv.Itoa(fps), "-pattern_type", "glob"},
+			[]string{"-c:v", videoCodec, "-pix_fmt", "yuva420p", "-f", target},
+			false,
+		)
+		if err != nil {
+			return nil, "", fmt.Errorf("failed to run ffmpeg: %w", err)
+		}
+	} else {
+		path = lottieOutput
+	}
+	data, err = os.ReadFile(path)
+	if err != nil {
+		return nil, "", fmt.Errorf("failed to read converted file: %w", err)
+	}
+	return data, outputMime, nil
+}
+
+func (br *DiscordBridge) copyAttachmentToMatrix(intent *appservice.IntentAPI, url string, encrypt bool, meta AttachmentMeta) (returnDBFile *database.File, returnErr error) {
+	isCacheable := br.Config.Bridge.CacheMedia != "never" && (br.Config.Bridge.CacheMedia == "always" || !encrypt)
+	returnDBFile = br.DB.File.Get(url, encrypt)
+	if returnDBFile == nil {
+		transferKey := attachmentKey{url, encrypt}
+		once, _ := br.attachmentTransfers.GetOrSet(transferKey, &util.ReturnableOnce[*database.File]{})
+		returnDBFile, returnErr = once.Do(func() (onceDBFile *database.File, onceErr error) {
+			if isCacheable {
+				onceDBFile = br.DB.File.Get(url, encrypt)
+				if onceDBFile != nil {
+					return
+				}
+			}
+
+			const attachmentSizeVal = 1
+			ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+			onceErr = br.parallelAttachmentSemaphore.Acquire(ctx, attachmentSizeVal)
+			cancel()
+			if onceErr != nil {
+				br.ZLog.Warn().Err(onceErr).Msg("Failed to acquire semaphore")
+				onceErr = fmt.Errorf("reuploading timed out")
+				return
+			}
+			var semaWg sync.WaitGroup
+			semaWg.Add(1)
+			defer semaWg.Done()
+			go func() {
+				semaWg.Wait()
+				br.parallelAttachmentSemaphore.Release(attachmentSizeVal)
+			}()
+
+			var data []byte
+			data, onceErr = downloadDiscordAttachment(url, br.MediaConfig.UploadSize)
+			if onceErr != nil {
+				return
+			}
+
+			if meta.Converter != nil {
+				data, meta.MimeType, onceErr = meta.Converter(data)
+				if onceErr != nil {
+					onceErr = fmt.Errorf("failed to convert attachment: %w", onceErr)
+					return
+				}
+			}
+
+			onceDBFile, onceErr = br.uploadMatrixAttachment(intent, data, url, encrypt, meta, &semaWg)
+			if onceErr != nil {
+				return
+			}
+			if isCacheable {
+				onceDBFile.Insert(nil)
+			}
+			br.attachmentTransfers.Delete(transferKey)
+			return
+		})
+	}
+	return
+}
+
+func (portal *Portal) getEmojiMXCByDiscordID(emojiID, name string, animated bool) id.ContentURI {
+	var url, mimeType, ext string
+	if animated {
+		url = discordgo.EndpointEmojiAnimated(emojiID)
+		mimeType = "image/gif"
+		ext = "gif"
+	} else {
+		url = discordgo.EndpointEmoji(emojiID)
+		mimeType = "image/png"
+		ext = "png"
+	}
+	mxc := portal.bridge.Config.Bridge.MediaPatterns.Emoji(emojiID, ext)
+	if !mxc.IsEmpty() {
+		return mxc
+	}
+	dbFile, err := portal.bridge.copyAttachmentToMatrix(portal.MainIntent(), url, false, AttachmentMeta{
+		AttachmentID: emojiID,
+		MimeType:     mimeType,
+		EmojiName:    name,
+	})
+	if err != nil {
+		portal.log.Warn().Err(err).Str("emoji_id", emojiID).Msg("Failed to copy emoji to Matrix")
+		return id.ContentURI{}
+	}
+	return dbFile.MXC
 }

avatar.go

@@ -1,40 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"io"
-	"net/http"
-
-	"maunium.net/go/mautrix/appservice"
-	"maunium.net/go/mautrix/id"
-
-	"github.com/bwmarrin/discordgo"
-)
-
-func uploadAvatar(intent *appservice.IntentAPI, url string) (id.ContentURI, error) {
-	req, err := http.NewRequest(http.MethodGet, url, nil)
-	if err != nil {
-		return id.ContentURI{}, fmt.Errorf("failed to prepare request: %w", err)
-	}
-	for key, value := range discordgo.DroidImageHeaders {
-		req.Header.Set(key, value)
-	}
-	getResp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return id.ContentURI{}, fmt.Errorf("failed to download avatar: %w", err)
-	}
-
-	data, err := io.ReadAll(getResp.Body)
-	_ = getResp.Body.Close()
-	if err != nil {
-		return id.ContentURI{}, fmt.Errorf("failed to read avatar data: %w", err)
-	}
-
-	mime := http.DetectContentType(data)
-	resp, err := intent.UploadBytes(data, mime)
-	if err != nil {
-		return id.ContentURI{}, fmt.Errorf("failed to upload avatar to Matrix: %w", err)
-	}
-
-	return resp.ContentURI, nil
-}

backfill.go

@@ -0,0 +1,380 @@
+package main
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+	"sort"
+
+	"github.com/bwmarrin/discordgo"
+	"github.com/rs/zerolog"
+	"maunium.net/go/mautrix"
+	"maunium.net/go/mautrix/event"
+	"maunium.net/go/mautrix/id"
+
+	"go.mau.fi/mautrix-discord/database"
+)
+
+func (portal *Portal) forwardBackfillInitial(source *User, thread *Thread) {
+	log := portal.log
+	defer func() {
+		log.Debug().Msg("Forward backfill finished, unlocking lock")
+		portal.forwardBackfillLock.Unlock()
+	}()
+	// This should only be called from CreateMatrixRoom which locks forwardBackfillLock before creating the room.
+	if portal.forwardBackfillLock.TryLock() {
+		panic("forwardBackfillInitial() called without locking forwardBackfillLock")
+	}
+
+	limit := portal.bridge.Config.Bridge.Backfill.Limits.Initial.Channel
+	if portal.GuildID == "" {
+		limit = portal.bridge.Config.Bridge.Backfill.Limits.Initial.DM
+		if thread != nil {
+			limit = portal.bridge.Config.Bridge.Backfill.Limits.Initial.Thread
+			thread.initialBackfillAttempted = true
+		}
+	}
+	if limit == 0 {
+		return
+	}
+
+	with := log.With().
+		Str("action", "initial backfill").
+		Str("room_id", portal.MXID.String()).
+		Int("limit", limit)
+	if thread != nil {
+		with = with.Str("thread_id", thread.ID)
+	}
+	log = with.Logger()
+
+	portal.backfillLimited(log, source, limit, "", thread)
+}
+
+func (portal *Portal) ForwardBackfillMissed(source *User, serverLastMessageID string, thread *Thread) {
+	if portal.MXID == "" {
+		return
+	}
+
+	limit := portal.bridge.Config.Bridge.Backfill.Limits.Missed.Channel
+	if portal.GuildID == "" {
+		limit = portal.bridge.Config.Bridge.Backfill.Limits.Missed.DM
+		if thread != nil {
+			limit = portal.bridge.Config.Bridge.Backfill.Limits.Missed.Thread
+		}
+	}
+	if limit == 0 {
+		return
+	}
+	with := portal.log.With().
+		Str("action", "missed event backfill").
+		Str("room_id", portal.MXID.String()).
+		Int("limit", limit)
+	if thread != nil {
+		with = with.Str("thread_id", thread.ID)
+	}
+	log := with.Logger()
+
+	portal.forwardBackfillLock.Lock()
+	defer portal.forwardBackfillLock.Unlock()
+
+	var lastMessage *database.Message
+	if thread != nil {
+		lastMessage = portal.bridge.DB.Message.GetLastInThread(portal.Key, thread.ID)
+	} else {
+		lastMessage = portal.bridge.DB.Message.GetLast(portal.Key)
+	}
+	if lastMessage == nil || serverLastMessageID == "" {
+		log.Debug().Msg("Not backfilling, no last message in database or no last message in metadata")
+		return
+	} else if !shouldBackfill(lastMessage.DiscordID, serverLastMessageID) {
+		log.Debug().
+			Str("last_bridged_message", lastMessage.DiscordID).
+			Str("last_server_message", serverLastMessageID).
+			Msg("Not backfilling, last message in database is newer than last message in metadata")
+		return
+	}
+	log.Debug().
+		Str("last_bridged_message", lastMessage.DiscordID).
+		Str("last_server_message", serverLastMessageID).
+		Msg("Backfilling missed messages")
+	if limit < 0 {
+		portal.backfillUnlimitedMissed(log, source, lastMessage.DiscordID, thread)
+	} else {
+		portal.backfillLimited(log, source, limit, lastMessage.DiscordID, thread)
+	}
+}
+
+const messageFetchChunkSize = 50
+
+func (portal *Portal) collectBackfillMessages(log zerolog.Logger, source *User, limit int, until string, thread *Thread) ([]*discordgo.Message, bool, error) {
+	var messages []*discordgo.Message
+	var before string
+	var foundAll bool
+	protoChannelID := portal.Key.ChannelID
+	if thread != nil {
+		protoChannelID = thread.ID
+	}
+	for {
+		log.Debug().Str("before_id", before).Msg("Fetching messages for backfill")
+		newMessages, err := source.Session.ChannelMessages(protoChannelID, messageFetchChunkSize, before, "", "")
+		if err != nil {
+			return nil, false, err
+		}
+		if until != "" {
+			for i, msg := range newMessages {
+				if compareMessageIDs(msg.ID, until) <= 0 {
+					log.Debug().
+						Str("message_id", msg.ID).
+						Str("until_id", until).
+						Msg("Found message that was already bridged")
+					newMessages = newMessages[:i]
+					foundAll = true
+					break
+				}
+			}
+		}
+		messages = append(messages, newMessages...)
+		log.Debug().Int("count", len(newMessages)).Msg("Added messages to backfill collection")
+		if len(newMessages) < messageFetchChunkSize || len(messages) >= limit {
+			break
+		}
+		before = newMessages[len(newMessages)-1].ID
+	}
+	if len(messages) > limit {
+		foundAll = false
+		messages = messages[:limit]
+	}
+	return messages, foundAll, nil
+}
+
+func (portal *Portal) backfillLimited(log zerolog.Logger, source *User, limit int, after string, thread *Thread) {
+	messages, foundAll, err := portal.collectBackfillMessages(log, source, limit, after, thread)
+	if err != nil {
+		log.Err(err).Msg("Error collecting messages to forward backfill")
+		return
+	}
+	log.Info().
+		Int("count", len(messages)).
+		Bool("found_all", foundAll).
+		Msg("Collected messages to backfill")
+	sort.Sort(MessageSlice(messages))
+	if !foundAll && after != "" {
+		_, err = portal.sendMatrixMessage(portal.MainIntent(), event.EventMessage, &event.MessageEventContent{
+			MsgType: event.MsgNotice,
+			Body:    "Some messages may have been missed here while the bridge was offline.",
+		}, nil, 0)
+		if err != nil {
+			log.Warn().Err(err).Msg("Failed to send missed message warning")
+		} else {
+			log.Debug().Msg("Sent warning about possibly missed messages")
+		}
+	}
+	portal.sendBackfillBatch(log, source, messages, thread)
+}
+
+func (portal *Portal) backfillUnlimitedMissed(log zerolog.Logger, source *User, after string, thread *Thread) {
+	protoChannelID := portal.Key.ChannelID
+	if thread != nil {
+		protoChannelID = thread.ID
+	}
+	for {
+		log.Debug().Str("after_id", after).Msg("Fetching chunk of messages to backfill")
+		messages, err := source.Session.ChannelMessages(protoChannelID, messageFetchChunkSize, "", after, "")
+		if err != nil {
+			log.Err(err).Msg("Error fetching chunk of messages to forward backfill")
+			return
+		}
+		log.Debug().Int("count", len(messages)).Msg("Fetched chunk of messages to backfill")
+		sort.Sort(MessageSlice(messages))
+
+		portal.sendBackfillBatch(log, source, messages, thread)
+
+		if len(messages) < messageFetchChunkSize {
+			// Assume that was all the missing messages
+			log.Debug().Msg("Chunk had less than 50 messages, stopping backfill")
+			return
+		}
+		after = messages[len(messages)-1].ID
+	}
+}
+
+func (portal *Portal) sendBackfillBatch(log zerolog.Logger, source *User, messages []*discordgo.Message, thread *Thread) {
+	if portal.bridge.SpecVersions.Supports(mautrix.BeeperFeatureBatchSending) {
+		log.Debug().Msg("Using hungryserv, sending messages with batch send endpoint")
+		portal.forwardBatchSend(log, source, messages, thread)
+	} else {
+		log.Debug().Msg("Not using hungryserv, sending messages one by one")
+		for _, msg := range messages {
+			portal.handleDiscordMessageCreate(source, msg, thread)
+		}
+	}
+}
+
+func (portal *Portal) forwardBatchSend(log zerolog.Logger, source *User, messages []*discordgo.Message, thread *Thread) {
+	evts, metas, dbMessages := portal.convertMessageBatch(log, source, messages, thread)
+	if len(evts) == 0 {
+		log.Warn().Msg("Didn't get any events to backfill")
+		return
+	}
+	log.Info().Int("events", len(evts)).Msg("Converted messages to backfill")
+	resp, err := portal.MainIntent().BeeperBatchSend(portal.MXID, &mautrix.ReqBeeperBatchSend{
+		Forward: true,
+		Events:  evts,
+	})
+	if err != nil {
+		log.Err(err).Msg("Error sending backfill batch")
+		return
+	}
+	for i, evtID := range resp.EventIDs {
+		dbMessages[i].MXID = evtID
+		if metas[i] != nil && metas[i].Flags == discordgo.MessageFlagsHasThread {
+			// TODO proper context
+			ctx := log.WithContext(context.Background())
+			portal.bridge.threadFound(ctx, source, &dbMessages[i], metas[i].ID, metas[i].Thread)
+		}
+	}
+	portal.bridge.DB.Message.MassInsert(portal.Key, dbMessages)
+}
+
+func (portal *Portal) convertMessageBatch(log zerolog.Logger, source *User, messages []*discordgo.Message, thread *Thread) ([]*event.Event, []*discordgo.Message, []database.Message) {
+	var discordThreadID string
+	var threadRootEvent, lastThreadEvent id.EventID
+	if thread != nil {
+		discordThreadID = thread.ID
+		threadRootEvent = thread.RootMXID
+		lastThreadEvent = threadRootEvent
+		lastInThread := portal.bridge.DB.Message.GetLastInThread(portal.Key, thread.ID)
+		if lastInThread != nil {
+			lastThreadEvent = lastInThread.MXID
+		}
+	}
+
+	evts := make([]*event.Event, 0, len(messages))
+	dbMessages := make([]database.Message, 0, len(messages))
+	metas := make([]*discordgo.Message, 0, len(messages))
+	ctx := context.Background()
+	for _, msg := range messages {
+		for _, mention := range msg.Mentions {
+			puppet := portal.bridge.GetPuppetByID(mention.ID)
+			puppet.UpdateInfo(nil, mention, nil)
+		}
+
+		puppet := portal.bridge.GetPuppetByID(msg.Author.ID)
+		puppet.UpdateInfo(source, msg.Author, msg)
+		intent := puppet.IntentFor(portal)
+		replyTo := portal.getReplyTarget(source, discordThreadID, msg.MessageReference, msg.Embeds, true)
+		mentions := portal.convertDiscordMentions(msg, false)
+
+		ts, _ := discordgo.SnowflakeTimestamp(msg.ID)
+		log := log.With().
+			Str("message_id", msg.ID).
+			Int("message_type", int(msg.Type)).
+			Str("author_id", msg.Author.ID).
+			Logger()
+		parts := portal.convertDiscordMessage(log.WithContext(ctx), puppet, intent, msg)
+		for i, part := range parts {
+			if (replyTo != nil || threadRootEvent != "") && part.Content.RelatesTo == nil {
+				part.Content.RelatesTo = &event.RelatesTo{}
+			}
+			if threadRootEvent != "" {
+				part.Content.RelatesTo.SetThread(threadRootEvent, lastThreadEvent)
+			}
+			if replyTo != nil {
+				part.Content.RelatesTo.SetReplyTo(replyTo.EventID)
+				// Only set reply for first event
+				replyTo = nil
+			}
+
+			part.Content.Mentions = mentions
+			// Only set mentions for first event, but keep empty object for rest
+			mentions = &event.Mentions{}
+
+			partName := part.AttachmentID
+			// Always use blank part name for first part so that replies and other things
+			// can reference it without knowing about attachments.
+			if i == 0 {
+				partName = ""
+			}
+			evt := &event.Event{
+				ID:        portal.deterministicEventID(msg.ID, partName),
+				Type:      part.Type,
+				Sender:    intent.UserID,
+				Timestamp: ts.UnixMilli(),
+				Content: event.Content{
+					Parsed: part.Content,
+					Raw:    part.Extra,
+				},
+			}
+			var err error
+			evt.Type, err = portal.encrypt(intent, &evt.Content, evt.Type)
+			if err != nil {
+				log.Err(err).Msg("Failed to encrypt event")
+				continue
+			}
+			intent.AddDoublePuppetValue(&evt.Content)
+			evts = append(evts, evt)
+			dbMessages = append(dbMessages, database.Message{
+				Channel:      portal.Key,
+				DiscordID:    msg.ID,
+				SenderID:     msg.Author.ID,
+				Timestamp:    ts,
+				AttachmentID: part.AttachmentID,
+				SenderMXID:   intent.UserID,
+			})
+			if i == 0 {
+				metas = append(metas, msg)
+			} else {
+				metas = append(metas, nil)
+			}
+			lastThreadEvent = evt.ID
+		}
+	}
+	return evts, metas, dbMessages
+}
+
+func (portal *Portal) deterministicEventID(messageID, partName string) id.EventID {
+	data := fmt.Sprintf("%s/discord/%s/%s", portal.MXID, messageID, partName)
+	sum := sha256.Sum256([]byte(data))
+	return id.EventID(fmt.Sprintf("$%s:discord.com", base64.RawURLEncoding.EncodeToString(sum[:])))
+}
+
+// compareMessageIDs compares two Discord message IDs.
+//
+// If the first ID is lower, -1 is returned.
+// If the second ID is lower, 1 is returned.
+// If the IDs are equal, 0 is returned.
+func compareMessageIDs(id1, id2 string) int {
+	if id1 == id2 {
+		return 0
+	}
+	if len(id1) < len(id2) {
+		return -1
+	} else if len(id2) < len(id1) {
+		return 1
+	}
+	if id1 < id2 {
+		return -1
+	}
+	return 1
+}
+
+func shouldBackfill(latestBridgedIDStr, latestIDFromServerStr string) bool {
+	return compareMessageIDs(latestBridgedIDStr, latestIDFromServerStr) == -1
+}
+
+type MessageSlice []*discordgo.Message
+
+var _ sort.Interface = (MessageSlice)(nil)
+
+func (a MessageSlice) Len() int {
+	return len(a)
+}
+
+func (a MessageSlice) Swap(i, j int) {
+	a[i], a[j] = a[j], a[i]
+}
+
+func (a MessageSlice) Less(i, j int) bool {
+	return compareMessageIDs(a[i].ID, a[j].ID) == -1
+}

commands.go

@@ -19,6 +19,7 @@ package main
 import (
 	"bytes"
 	"context"
+	"encoding/base64"
 	"errors"
 	"fmt"
 	"html"
@@ -30,10 +31,13 @@ import (
 	"github.com/skip2/go-qrcode"
 
 	"maunium.net/go/mautrix"
+	"maunium.net/go/mautrix/appservice"
+	"maunium.net/go/mautrix/bridge/bridgeconfig"
 	"maunium.net/go/mautrix/bridge/commands"
 	"maunium.net/go/mautrix/event"
 	"maunium.net/go/mautrix/id"
 
+	"go.mau.fi/mautrix-discord/database"
 	"go.mau.fi/mautrix-discord/remoteauth"
 )
 
@@ -44,14 +48,22 @@ type WrappedCommandEvent struct {
 	Portal *Portal
 }
 
+var HelpSectionPortalManagement = commands.HelpSection{Name: "Portal management", Order: 20}
+
 func (br *DiscordBridge) RegisterCommands() {
 	proc := br.CommandProcessor.(*commands.Processor)
 	proc.AddHandlers(
 		cmdLoginToken,
 		cmdLoginQR,
 		cmdLogout,
+		cmdPing,
 		cmdReconnect,
 		cmdDisconnect,
+		cmdBridge,
+		cmdUnbridge,
+		cmdDeletePortal,
+		cmdSetRelay,
+		cmdUnsetRelay,
 		cmdGuilds,
 		cmdRejoinSpace,
 		cmdDeleteAllPortals,
@@ -78,12 +90,45 @@ var cmdLoginToken = &commands.FullHandler{
 	Help: commands.HelpMeta{
 		Section:     commands.HelpSectionAuth,
 		Description: "Link the bridge to your Discord account by extracting the access token manually.",
+		Args:        "<user/bot/oauth> <_token_>",
 	},
 }
 
+const discordTokenEpoch = 1293840000
+
+func decodeToken(token string) (userID int64, err error) {
+	parts := strings.Split(token, ".")
+	if len(parts) != 3 {
+		err = fmt.Errorf("invalid number of parts in token")
+		return
+	}
+	var userIDStr []byte
+	userIDStr, err = base64.RawURLEncoding.DecodeString(parts[0])
+	if err != nil {
+		err = fmt.Errorf("invalid base64 in user ID part: %w", err)
+		return
+	}
+	_, err = base64.RawURLEncoding.DecodeString(parts[1])
+	if err != nil {
+		err = fmt.Errorf("invalid base64 in random part: %w", err)
+		return
+	}
+	_, err = base64.RawURLEncoding.DecodeString(parts[2])
+	if err != nil {
+		err = fmt.Errorf("invalid base64 in checksum part: %w", err)
+		return
+	}
+	userID, err = strconv.ParseInt(string(userIDStr), 10, 64)
+	if err != nil {
+		err = fmt.Errorf("invalid number in decoded user ID part: %w", err)
+		return
+	}
+	return
+}
+
 func fnLoginToken(ce *WrappedCommandEvent) {
-	if len(ce.Args) == 0 {
-		ce.Reply("**Usage**: `$cmdprefix login-token <token>`")
+	if len(ce.Args) != 2 {
+		ce.Reply("**Usage**: `$cmdprefix login-token <user/bot/oauth> <token>`")
 		return
 	}
 	ce.MarkRead()
@@ -92,7 +137,25 @@ func fnLoginToken(ce *WrappedCommandEvent) {
 		ce.Reply("You're already logged in")
 		return
 	}
-	if err := ce.User.Login(ce.Args[0]); err != nil {
+	token := ce.Args[1]
+	userID, err := decodeToken(token)
+	if err != nil {
+		ce.Reply("Invalid token")
+		return
+	}
+	switch strings.ToLower(ce.Args[0]) {
+	case "user":
+		// Token is used as-is
+	case "bot":
+		token = "Bot " + token
+	case "oauth":
+		token = "Bearer " + token
+	default:
+		ce.Reply("Token type must be `user`, `bot` or `oauth`")
+		return
+	}
+	ce.Reply("Connecting to Discord as user ID %d", userID)
+	if err = ce.User.Login(token); err != nil {
 		ce.Reply("Error connecting to Discord: %v", err)
 		return
 	}
@@ -218,7 +281,7 @@ var cmdLogout = &commands.FullHandler{
 
 func fnLogout(ce *WrappedCommandEvent) {
 	wasLoggedIn := ce.User.DiscordID != ""
-	ce.User.Logout()
+	ce.User.Logout(false)
 	if wasLoggedIn {
 		ce.Reply("Logged out successfully.")
 	} else {
@@ -226,6 +289,29 @@ func fnLogout(ce *WrappedCommandEvent) {
 	}
 }
 
+var cmdPing = &commands.FullHandler{
+	Func: wrapCommand(fnPing),
+	Name: "ping",
+	Help: commands.HelpMeta{
+		Section:     commands.HelpSectionAuth,
+		Description: "Check your connection to Discord",
+	},
+}
+
+func fnPing(ce *WrappedCommandEvent) {
+	if ce.User.Session == nil {
+		if ce.User.DiscordToken == "" {
+			ce.Reply("You're not logged in")
+		} else {
+			ce.Reply("You have a Discord token stored, but are not connected for some reason 🤔")
+		}
+	} else if ce.User.wasDisconnected {
+		ce.Reply("You're logged in, but the Discord connection seems to be dead 💥")
+	} else {
+		ce.Reply("You're logged in as %s#%s (`%s`)", ce.User.Session.State.User.Username, ce.User.Session.State.User.Discriminator, ce.User.DiscordID)
+	}
+}
+
 var cmdDisconnect = &commands.FullHandler{
 	Func: wrapCommand(fnDisconnect),
 	Name: "disconnect",
@@ -271,7 +357,7 @@ var cmdRejoinSpace = &commands.FullHandler{
 	Func: wrapCommand(fnRejoinSpace),
 	Name: "rejoin-space",
 	Help: commands.HelpMeta{
-		Section:     commands.HelpSectionUnclassified,
+		Section:     HelpSectionPortalManagement,
 		Description: "Ask the bridge for an invite to a space you left",
 		Args:        "<_guild ID_/main/dms>",
 	},
@@ -285,10 +371,10 @@ func fnRejoinSpace(ce *WrappedCommandEvent) {
 	}
 	user := ce.User
 	if ce.Args[0] == "main" {
-		user.ensureInvited(nil, user.GetSpaceRoom(), false)
+		user.ensureInvited(nil, user.GetSpaceRoom(), false, true)
 		ce.Reply("Invited you to your main space ([link](%s))", user.GetSpaceRoom().URI(ce.Bridge.AS.HomeserverDomain).MatrixToURL())
 	} else if ce.Args[0] == "dms" {
-		user.ensureInvited(nil, user.GetDMSpaceRoom(), false)
+		user.ensureInvited(nil, user.GetDMSpaceRoom(), false, true)
 		ce.Reply("Invited you to your DM space ([link](%s))", user.GetDMSpaceRoom().URI(ce.Bridge.AS.HomeserverDomain).MatrixToURL())
 	} else if _, err := strconv.Atoi(ce.Args[0]); err == nil {
 		ce.Reply("Rejoining guild spaces is not yet implemented")
@@ -298,25 +384,182 @@ func fnRejoinSpace(ce *WrappedCommandEvent) {
 	}
 }
 
+var roomModerator = event.Type{Type: "fi.mau.discord.admin", Class: event.StateEventType}
+
+var cmdSetRelay = &commands.FullHandler{
+	Func: wrapCommand(fnSetRelay),
+	Name: "set-relay",
+	Help: commands.HelpMeta{
+		Section:     HelpSectionPortalManagement,
+		Description: "Create or set a relay webhook for a portal",
+		Args:        "[room ID] <​--url URL> OR <​--create [name]>",
+	},
+	RequiresLogin:      true,
+	RequiresEventLevel: roomModerator,
+}
+
+const webhookURLFormat = "https://discord.com/api/webhooks/%d/%s"
+
+const selectRelayHelp = "Usage: `$cmdprefix [room ID] <​--url URL> OR <​--create [name]>`"
+
+func fnSetRelay(ce *WrappedCommandEvent) {
+	portal := ce.Portal
+	if len(ce.Args) > 0 && strings.HasPrefix(ce.Args[0], "!") {
+		portal = ce.Bridge.GetPortalByMXID(id.RoomID(ce.Args[0]))
+		if portal == nil {
+			ce.Reply("Portal with room ID %s not found", ce.Args[0])
+			return
+		}
+		if ce.User.PermissionLevel < bridgeconfig.PermissionLevelAdmin {
+			levels, err := portal.MainIntent().PowerLevels(ce.RoomID)
+			if err != nil {
+				ce.ZLog.Warn().Err(err).Msg("Failed to check room power levels")
+				ce.Reply("Failed to get room power levels to see if you're allowed to use that command")
+				return
+			} else if levels.GetUserLevel(ce.User.GetMXID()) < levels.GetEventLevel(roomModerator) {
+				ce.Reply("You don't have admin rights in that room")
+				return
+			}
+		}
+		ce.Args = ce.Args[1:]
+	} else if portal == nil {
+		ce.Reply("You must either run the command in a portal, or specify an internal room ID as the first parameter")
+		return
+	}
+	log := ce.ZLog.With().Str("channel_id", portal.Key.ChannelID).Logger()
+	if portal.GuildID == "" {
+		ce.Reply("Only guild channels can have relays")
+		return
+	} else if portal.RelayWebhookID != "" {
+		webhookMeta, err := relayClient.WebhookWithToken(portal.RelayWebhookID, portal.RelayWebhookSecret)
+		if err != nil {
+			log.Warn().Err(err).Msg("Failed to get existing webhook info")
+			ce.Reply("This channel has a relay webhook set, but getting its info failed: %v", err)
+			return
+		}
+		ce.Reply("This channel already has a relay webhook %s (%s)", webhookMeta.Name, webhookMeta.ID)
+		return
+	} else if len(ce.Args) == 0 {
+		ce.Reply(selectRelayHelp)
+		return
+	}
+	createType := strings.ToLower(strings.TrimLeft(ce.Args[0], "-"))
+	var webhookMeta *discordgo.Webhook
+	switch createType {
+	case "url":
+		if len(ce.Args) < 2 {
+			ce.Reply("Usage: `$cmdprefix [room ID] --url <URL>")
+			return
+		}
+		ce.Redact()
+		var webhookID int64
+		var webhookSecret string
+		_, err := fmt.Sscanf(ce.Args[1], webhookURLFormat, &webhookID, &webhookSecret)
+		if err != nil {
+			log.Warn().Str("webhook_url", ce.Args[1]).Err(err).Msg("Failed to parse provided webhook URL")
+			ce.Reply("Invalid webhook URL")
+			return
+		}
+		webhookMeta, err = relayClient.WebhookWithToken(strconv.FormatInt(webhookID, 10), webhookSecret)
+		if err != nil {
+			log.Warn().Err(err).Msg("Failed to get webhook info")
+			ce.Reply("Failed to get webhook info: %v", err)
+			return
+		}
+	case "create":
+		perms, err := ce.User.Session.UserChannelPermissions(ce.User.DiscordID, portal.Key.ChannelID)
+		if err != nil {
+			log.Warn().Err(err).Msg("Failed to check user permissions")
+			ce.Reply("Failed to check if you have permission to create webhooks")
+			return
+		} else if perms&discordgo.PermissionManageWebhooks == 0 {
+			log.Debug().Int64("perms", perms).Msg("User doesn't have permissions to manage webhooks in channel")
+			ce.Reply("You don't have permission to manage webhooks in that channel")
+			return
+		}
+		name := "mautrix"
+		if len(ce.Args) > 1 {
+			name = strings.Join(ce.Args[1:], " ")
+		}
+		log.Debug().Str("webhook_name", name).Msg("Creating webhook")
+		webhookMeta, err = ce.User.Session.WebhookCreate(portal.Key.ChannelID, name, "")
+		if err != nil {
+			log.Warn().Err(err).Msg("Failed to create webhook")
+			ce.Reply("Failed to create webhook: %v", err)
+			return
+		}
+	default:
+		ce.Reply(selectRelayHelp)
+		return
+	}
+	if portal.Key.ChannelID != webhookMeta.ChannelID {
+		log.Debug().
+			Str("portal_channel_id", portal.Key.ChannelID).
+			Str("webhook_channel_id", webhookMeta.ChannelID).
+			Msg("Provided webhook is for wrong channel")
+		ce.Reply("That webhook is not for the right channel (expected %s, webhook is for %s)", portal.Key.ChannelID, webhookMeta.ChannelID)
+		return
+	}
+	log.Debug().Str("webhook_id", webhookMeta.ID).Msg("Setting portal relay webhook")
+	portal.RelayWebhookID = webhookMeta.ID
+	portal.RelayWebhookSecret = webhookMeta.Token
+	portal.Update()
+	ce.Reply("Saved webhook %s (%s) as portal relay webhook", webhookMeta.Name, portal.RelayWebhookID)
+}
+
+var cmdUnsetRelay = &commands.FullHandler{
+	Func: wrapCommand(fnUnsetRelay),
+	Name: "unset-relay",
+	Help: commands.HelpMeta{
+		Section:     HelpSectionPortalManagement,
+		Description: "Disable the relay webhook and optionally delete it on Discord",
+		Args:        "[--delete]",
+	},
+	RequiresPortal:     true,
+	RequiresEventLevel: roomModerator,
+}
+
+func fnUnsetRelay(ce *WrappedCommandEvent) {
+	if ce.Portal.RelayWebhookID == "" {
+		ce.Reply("This portal doesn't have a relay webhook")
+		return
+	}
+	if len(ce.Args) > 0 && ce.Args[0] == "--delete" {
+		err := relayClient.WebhookDeleteWithToken(ce.Portal.RelayWebhookID, ce.Portal.RelayWebhookSecret)
+		if err != nil {
+			ce.Reply("Failed to delete webhook: %v", err)
+			return
+		} else {
+			ce.Reply("Successfully deleted webhook")
+		}
+	} else {
+		ce.Reply("Relay webhook disabled")
+	}
+	ce.Portal.RelayWebhookID = ""
+	ce.Portal.RelayWebhookSecret = ""
+	ce.Portal.Update()
+}
+
 var cmdGuilds = &commands.FullHandler{
 	Func:    wrapCommand(fnGuilds),
 	Name:    "guilds",
 	Aliases: []string{"servers", "guild", "server"},
 	Help: commands.HelpMeta{
-		Section:     commands.HelpSectionUnclassified,
+		Section:     HelpSectionPortalManagement,
 		Description: "Guild bridging management",
-		Args:        "<status/bridge/unbridge> [_guild ID_] [--entire]",
+		Args:        "<status/bridge/unbridge/bridging-mode> [_guild ID_] [...]",
 	},
 	RequiresLogin: true,
 }
 
-const smallGuildsHelp = "**Usage**: `$cmdprefix guilds <help/status/bridge/unbridge> [guild ID] [--entire]`"
+const smallGuildsHelp = "**Usage**: `$cmdprefix guilds <help/status/bridge/unbridge> [guild ID] [...]`"
 
 const fullGuildsHelp = smallGuildsHelp + `
 
 * **help** - View this help message.
 * **status** - View the list of guilds and their bridging status.
 * **bridge <_guild ID_> [--entire]** - Enable bridging for a guild. The --entire flag auto-creates portals for all channels.
+* **bridging-mode <_guild ID_> <_mode_>** - Set the mode for bridging messages and new channels in a guild.
 * **unbridge <_guild ID_>** - Unbridge a guild and delete all channel portal rooms.`
 
 func fnGuilds(ce *WrappedCommandEvent) {
@@ -333,6 +576,8 @@ func fnGuilds(ce *WrappedCommandEvent) {
 		fnBridgeGuild(ce)
 	case "unbridge", "delete":
 		fnUnbridgeGuild(ce)
+	case "bridging-mode", "mode":
+		fnGuildBridgingMode(ce)
 	case "help":
 		ce.Reply(fullGuildsHelp)
 	default:
@@ -347,15 +592,11 @@ func fnListGuilds(ce *WrappedCommandEvent) {
 		if guild == nil {
 			continue
 		}
-		status := "not bridged"
-		if guild.MXID != "" {
-			status = "bridged"
-		}
 		var avatarHTML string
 		if !guild.AvatarURL.IsEmpty() {
-			avatarHTML = fmt.Sprintf(`<img data-mx-emoticon height="24" width="24" src="%s" alt="" title="Guild avatar"> `, guild.AvatarURL.String())
+			avatarHTML = fmt.Sprintf(`<img data-mx-emoticon height="24" src="%s" alt="" title="Guild avatar"> `, guild.AvatarURL.String())
 		}
-		items = append(items, fmt.Sprintf("<li>%s%s (<code>%s</code>) - %s</li>", avatarHTML, html.EscapeString(guild.Name), guild.ID, status))
+		items = append(items, fmt.Sprintf("<li>%s%s (<code>%s</code>) - %s</li>", avatarHTML, html.EscapeString(guild.Name), guild.ID, guild.BridgingMode.Description()))
 	}
 	if len(items) == 0 {
 		ce.Reply("No guilds found")
@@ -384,11 +625,190 @@ func fnUnbridgeGuild(ce *WrappedCommandEvent) {
 	}
 }
 
+const availableModes = "Available modes:\n" +
+	"* `nothing` to never bridge any messages (default when unbridged)\n" +
+	"* `if-portal-exists` to bridge messages in existing portals, but drop messages in unbridged channels\n" +
+	"* `create-on-message` to bridge all messages and create portals if necessary on incoming messages (default after bridging)\n" +
+	"* `everything` to bridge all messages and create portals proactively on bridge startup (default if bridged with `--entire`)\n"
+
+func fnGuildBridgingMode(ce *WrappedCommandEvent) {
+	if len(ce.Args) == 0 || len(ce.Args) > 2 {
+		ce.Reply("**Usage**: `$cmdprefix guilds bridging-mode <guild ID> [mode]`\n\n" + availableModes)
+		return
+	}
+	guild := ce.Bridge.GetGuildByID(ce.Args[0], false)
+	if guild == nil {
+		ce.Reply("Guild not found")
+		return
+	}
+	if len(ce.Args) == 1 {
+		ce.Reply("%s (%s) is currently set to %s (`%s`)\n\n%s", guild.PlainName, guild.ID, guild.BridgingMode.Description(), guild.BridgingMode.String(), availableModes)
+		return
+	}
+	mode := database.ParseGuildBridgingMode(ce.Args[1])
+	if mode == database.GuildBridgeInvalid {
+		ce.Reply("Invalid guild bridging mode `%s`", ce.Args[1])
+		return
+	}
+	guild.BridgingMode = mode
+	guild.Update()
+	ce.Reply("Set guild bridging mode to %s", mode.Description())
+}
+
+var cmdBridge = &commands.FullHandler{
+	Func: wrapCommand(fnBridge),
+	Name: "bridge",
+	Help: commands.HelpMeta{
+		Section:     HelpSectionPortalManagement,
+		Description: "Bridge this room to a specific Discord channel",
+		Args:        "[--replace[=delete]] <_channel ID_>",
+	},
+	RequiresEventLevel: roomModerator,
+}
+
+func isNumber(str string) bool {
+	for _, chr := range str {
+		if chr < '0' || chr > '9' {
+			return false
+		}
+	}
+	return true
+}
+
+func fnBridge(ce *WrappedCommandEvent) {
+	if ce.Portal != nil {
+		ce.Reply("This is already a portal room. Unbridge with `$cmdprefix unbridge` first if you want to link it to a different channel.")
+		return
+	}
+	var channelID string
+	var unbridgeOld, deleteOld bool
+	fail := true
+	for _, arg := range ce.Args {
+		arg = strings.ToLower(arg)
+		if arg == "--replace" {
+			unbridgeOld = true
+		} else if arg == "--replace=delete" {
+			unbridgeOld = true
+			deleteOld = true
+		} else if channelID == "" && isNumber(arg) {
+			channelID = arg
+			fail = false
+		} else {
+			fail = true
+			break
+		}
+	}
+	if fail {
+		ce.Reply("**Usage**: `$cmdprefix bridge [--replace[=delete]] <channel ID>`")
+		return
+	}
+	portal := ce.User.GetExistingPortalByID(channelID)
+	if portal == nil {
+		ce.Reply("Channel not found")
+		return
+	}
+	portal.roomCreateLock.Lock()
+	defer portal.roomCreateLock.Unlock()
+	if portal.MXID != "" {
+		hasUnbridgePermission := ce.User.PermissionLevel >= bridgeconfig.PermissionLevelAdmin
+		if !hasUnbridgePermission {
+			levels, err := portal.MainIntent().PowerLevels(portal.MXID)
+			if errors.Is(err, mautrix.MNotFound) {
+				ce.ZLog.Debug().Err(err).Msg("Got M_NOT_FOUND trying to get power levels to check if user can unbridge it, assuming the room is gone")
+				hasUnbridgePermission = true
+			} else if err != nil {
+				ce.ZLog.Warn().Err(err).Msg("Failed to check room power levels")
+				ce.Reply("Failed to get power levels in old room to see if you're allowed to unbridge it")
+				return
+			} else {
+				hasUnbridgePermission = levels.GetUserLevel(ce.User.GetMXID()) >= levels.GetEventLevel(roomModerator)
+			}
+		}
+		if !unbridgeOld || !hasUnbridgePermission {
+			extraHelp := "Rerun the command with `--replace` or `--replace=delete` to unbridge the old room."
+			if !hasUnbridgePermission {
+				extraHelp = "Additionally, you do not have the permissions to unbridge the old room."
+			}
+			ce.Reply("That channel is already bridged to [%s](https://matrix.to/#/%s). %s", portal.Name, portal.MXID, extraHelp)
+			return
+		}
+		ce.ZLog.Debug().
+			Str("old_room_id", portal.MXID.String()).
+			Bool("delete", deleteOld).
+			Msg("Unbridging old room")
+		portal.removeFromSpace()
+		portal.cleanup(!deleteOld)
+		portal.RemoveMXID()
+		ce.ZLog.Info().
+			Str("old_room_id", portal.MXID.String()).
+			Bool("delete", deleteOld).
+			Msg("Unbridged old room to make space for new bridge")
+	}
+	if portal.Guild != nil && portal.Guild.BridgingMode < database.GuildBridgeIfPortalExists {
+		ce.ZLog.Debug().Str("guild_id", portal.Guild.ID).Msg("Bumping bridging mode of portal guild to if-portal-exists")
+		portal.Guild.BridgingMode = database.GuildBridgeIfPortalExists
+		portal.Guild.Update()
+	}
+	ce.ZLog.Debug().Str("channel_id", portal.Key.ChannelID).Msg("Bridging room")
+	portal.MXID = ce.RoomID
+	portal.bridge.portalsLock.Lock()
+	portal.bridge.portalsByMXID[portal.MXID] = portal
+	portal.bridge.portalsLock.Unlock()
+	portal.updateRoomName()
+	portal.updateRoomAvatar()
+	portal.updateRoomTopic()
+	portal.updateSpace()
+	portal.UpdateBridgeInfo()
+	state, err := portal.MainIntent().State(portal.MXID)
+	if err != nil {
+		ce.ZLog.Error().Err(err).Msg("Failed to update state cache for room")
+	} else {
+		encryptionEvent, isEncrypted := state[event.StateEncryption][""]
+		portal.Encrypted = isEncrypted && encryptionEvent.Content.AsEncryption().Algorithm == id.AlgorithmMegolmV1
+	}
+	portal.Update()
+	ce.Reply("Room successfully bridged")
+	ce.ZLog.Info().
+		Str("channel_id", portal.Key.ChannelID).
+		Bool("encrypted", portal.Encrypted).
+		Msg("Manual bridging complete")
+}
+
+var cmdUnbridge = &commands.FullHandler{
+	Func: wrapCommand(fnUnbridge),
+	Name: "unbridge",
+	Help: commands.HelpMeta{
+		Section:     HelpSectionPortalManagement,
+		Description: "Unbridge this room from the linked Discord channel",
+	},
+	RequiresPortal:     true,
+	RequiresEventLevel: roomModerator,
+}
+
+var cmdDeletePortal = &commands.FullHandler{
+	Func: wrapCommand(fnUnbridge),
+	Name: "delete-portal",
+	Help: commands.HelpMeta{
+		Section:     HelpSectionPortalManagement,
+		Description: "Unbridge this room and kick all Matrix users",
+	},
+	RequiresPortal:     true,
+	RequiresEventLevel: roomModerator,
+}
+
+func fnUnbridge(ce *WrappedCommandEvent) {
+	ce.Portal.roomCreateLock.Lock()
+	defer ce.Portal.roomCreateLock.Unlock()
+	ce.Portal.removeFromSpace()
+	ce.Portal.cleanup(ce.Command == "unbridge")
+	ce.Portal.RemoveMXID()
+}
+
 var cmdDeleteAllPortals = &commands.FullHandler{
 	Func: wrapCommand(fnDeleteAllPortals),
 	Name: "delete-all-portals",
 	Help: commands.HelpMeta{
-		Section:     commands.HelpSectionUnclassified,
+		Section:     commands.HelpSectionAdmin,
 		Description: "Delete all portals.",
 	},
 	RequiresAdmin: true,
@@ -396,14 +816,15 @@ var cmdDeleteAllPortals = &commands.FullHandler{
 
 func fnDeleteAllPortals(ce *WrappedCommandEvent) {
 	portals := ce.Bridge.GetAllPortals()
-	if len(portals) == 0 {
+	guilds := ce.Bridge.GetAllGuilds()
+	if len(portals) == 0 && len(guilds) == 0 {
 		ce.Reply("Didn't find any portals")
 		return
 	}
 
-	leave := func(portal *Portal) {
-		if len(portal.MXID) > 0 {
-			_, _ = portal.MainIntent().KickUser(portal.MXID, &mautrix.ReqKickUser{
+	leave := func(mxid id.RoomID, intent *appservice.IntentAPI) {
+		if len(mxid) > 0 {
+			_, _ = intent.KickUser(mxid, &mautrix.ReqKickUser{
 				Reason: "Deleting portal",
 				UserID: ce.User.MXID,
 			})
@@ -412,19 +833,23 @@ func fnDeleteAllPortals(ce *WrappedCommandEvent) {
 	customPuppet := ce.Bridge.GetPuppetByCustomMXID(ce.User.MXID)
 	if customPuppet != nil && customPuppet.CustomIntent() != nil {
 		intent := customPuppet.CustomIntent()
-		leave = func(portal *Portal) {
-			if len(portal.MXID) > 0 {
-				_, _ = intent.LeaveRoom(portal.MXID)
-				_, _ = intent.ForgetRoom(portal.MXID)
+		leave = func(mxid id.RoomID, _ *appservice.IntentAPI) {
+			if len(mxid) > 0 {
+				_, _ = intent.LeaveRoom(mxid)
+				_, _ = intent.ForgetRoom(mxid)
 			}
 		}
 	}
-	ce.Reply("Found %d portals, deleting...", len(portals))
+	ce.Reply("Found %d channel portals and %d guild portals, deleting...", len(portals), len(guilds))
 	for _, portal := range portals {
 		portal.Delete()
-		leave(portal)
+		leave(portal.MXID, portal.MainIntent())
 	}
-	ce.Reply("Finished deleting portal info. Now cleaning up rooms in background.")
+	for _, guild := range guilds {
+		guild.Delete()
+		leave(guild.MXID, ce.Bot)
+	}
+	ce.Reply("Finished deleting portal info. Now cleaning up rooms in background. You'll have to restart the bridge or relogin before rooms can be bridged again.")
 
 	go func() {
 		for _, portal := range portals {

commands_botinteraction.go

@@ -28,12 +28,14 @@ import (
 	"maunium.net/go/mautrix/bridge/commands"
 )
 
+var HelpSectionDiscordBots = commands.HelpSection{Name: "Discord bot interaction", Order: 30}
+
 var cmdCommands = &commands.FullHandler{
 	Func:    wrapCommand(fnCommands),
 	Name:    "commands",
 	Aliases: []string{"cmds", "cs"},
 	Help: commands.HelpMeta{
-		Section:     commands.HelpSectionUnclassified,
+		Section:     HelpSectionDiscordBots,
 		Description: "View parameters of bot interaction commands on Discord",
 		Args:        "search <_query_> OR help <_command_>",
 	},
@@ -46,7 +48,7 @@ var cmdExec = &commands.FullHandler{
 	Name:    "exec",
 	Aliases: []string{"command", "cmd", "c", "exec", "e"},
 	Help: commands.HelpMeta{
-		Section:     commands.HelpSectionUnclassified,
+		Section:     HelpSectionDiscordBots,
 		Description: "Run bot interaction commands on Discord",
 		Args:        "<_command_> [_arg=value ..._]",
 	},

config/bridge.go

@@ -25,6 +25,7 @@ import (
 	"github.com/bwmarrin/discordgo"
 
 	"maunium.net/go/mautrix/bridge/bridgeconfig"
+	"maunium.net/go/mautrix/id"
 )
 
 type BridgeConfig struct {
@@ -32,7 +33,7 @@ type BridgeConfig struct {
 	DisplaynameTemplate       string `yaml:"displayname_template"`
 	ChannelNameTemplate       string `yaml:"channel_name_template"`
 	GuildNameTemplate         string `yaml:"guild_name_template"`
-	PrivateChatPortalMeta     bool   `yaml:"private_chat_portal_meta"`
+	PrivateChatPortalMeta     string `yaml:"private_chat_portal_meta"`
 	PrivateChannelCreateLimit int    `yaml:"startup_private_channel_create_limit"`
 
 	PortalMessageBuffer int `yaml:"portal_message_buffer"`
@@ -50,6 +51,21 @@ type BridgeConfig struct {
 	DeletePortalOnChannelDelete bool `yaml:"delete_portal_on_channel_delete"`
 	DeleteGuildOnLeave          bool `yaml:"delete_guild_on_leave"`
 	FederateRooms               bool `yaml:"federate_rooms"`
+	PrefixWebhookMessages       bool `yaml:"prefix_webhook_messages"`
+	EnableWebhookAvatars        bool `yaml:"enable_webhook_avatars"`
+	UseDiscordCDNUpload         bool `yaml:"use_discord_cdn_upload"`
+
+	CacheMedia    string        `yaml:"cache_media"`
+	MediaPatterns MediaPatterns `yaml:"media_patterns"`
+
+	AnimatedSticker struct {
+		Target string `yaml:"target"`
+		Args   struct {
+			Width  int `yaml:"width"`
+			Height int `yaml:"height"`
+			FPS    int `yaml:"fps"`
+		} `yaml:"args"`
+	} `yaml:"animated_sticker"`
 
 	DoublePuppetServerMap      map[string]string `yaml:"double_puppet_server_map"`
 	DoublePuppetAllowDiscovery bool              `yaml:"double_puppet_allow_discovery"`
@@ -58,6 +74,14 @@ type BridgeConfig struct {
 	CommandPrefix      string                           `yaml:"command_prefix"`
 	ManagementRoomText bridgeconfig.ManagementRoomTexts `yaml:"management_room_text"`
 
+	Backfill struct {
+		Limits struct {
+			Initial BackfillLimitPart `yaml:"initial"`
+			Missed  BackfillLimitPart `yaml:"missed"`
+		} `yaml:"forward_limits"`
+		MaxGuildMembers int `yaml:"max_guild_members"`
+	} `yaml:"backfill"`
+
 	Encryption bridgeconfig.EncryptionConfig `yaml:"encryption"`
 
 	Provisioning struct {
@@ -73,6 +97,119 @@ type BridgeConfig struct {
 	guildNameTemplate   *template.Template `yaml:"-"`
 }
 
+type MediaPatterns struct {
+	Enabled        bool   `yaml:"enabled"`
+	TplAttachments string `yaml:"attachments"`
+	TplEmojis      string `yaml:"emojis"`
+	TplStickers    string `yaml:"stickers"`
+	TplAvatars     string `yaml:"avatars"`
+
+	attachments *template.Template `yaml:"-"`
+	emojis      *template.Template `yaml:"-"`
+	stickers    *template.Template `yaml:"-"`
+	avatars     *template.Template `yaml:"-"`
+}
+
+type umMediaPatterns MediaPatterns
+
+func (mp *MediaPatterns) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	err := unmarshal((*umMediaPatterns)(mp))
+	if err != nil {
+		return err
+	}
+	tpl := template.New("media_patterns")
+
+	pairs := []struct {
+		ptr      **template.Template
+		name     string
+		template string
+	}{
+		{&mp.attachments, "attachments", mp.TplAttachments},
+		{&mp.emojis, "emojis", mp.TplEmojis},
+		{&mp.stickers, "stickers", mp.TplStickers},
+		{&mp.avatars, "avatars", mp.TplAvatars},
+	}
+	for _, pair := range pairs {
+		if pair.template == "" {
+			continue
+		}
+		*pair.ptr, err = tpl.New(pair.name).Parse(pair.template)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+type attachmentParams struct {
+	ChannelID    string
+	AttachmentID string
+	FileName     string
+}
+
+type emojiStickerParams struct {
+	ID  string
+	Ext string
+}
+
+type avatarParams struct {
+	UserID   string
+	AvatarID string
+	Ext      string
+}
+
+func (mp *MediaPatterns) execute(tpl *template.Template, params any) id.ContentURI {
+	if tpl == nil || !mp.Enabled {
+		return id.ContentURI{}
+	}
+	var out strings.Builder
+	err := tpl.Execute(&out, params)
+	if err != nil {
+		panic(err)
+	}
+	uri, err := id.ParseContentURI(out.String())
+	if err != nil {
+		panic(err)
+	}
+	return uri
+}
+
+func (mp *MediaPatterns) Attachment(channelID, attachmentID, filename string) id.ContentURI {
+	return mp.execute(mp.attachments, attachmentParams{
+		ChannelID:    channelID,
+		AttachmentID: attachmentID,
+		FileName:     filename,
+	})
+}
+
+func (mp *MediaPatterns) Emoji(emojiID, ext string) id.ContentURI {
+	return mp.execute(mp.emojis, emojiStickerParams{
+		ID:  emojiID,
+		Ext: ext,
+	})
+}
+
+func (mp *MediaPatterns) Sticker(stickerID, ext string) id.ContentURI {
+	return mp.execute(mp.stickers, emojiStickerParams{
+		ID:  stickerID,
+		Ext: ext,
+	})
+}
+
+func (mp *MediaPatterns) Avatar(userID, avatarID, ext string) id.ContentURI {
+	return mp.execute(mp.avatars, avatarParams{
+		UserID:   userID,
+		AvatarID: avatarID,
+		Ext:      ext,
+	})
+}
+
+type BackfillLimitPart struct {
+	DM      int `yaml:"dm"`
+	Channel int `yaml:"channel"`
+	Thread  int `yaml:"thread"`
+}
+
 func (bc *BridgeConfig) GetResendBridgeInfo() bool {
 	return bc.ResendBridgeInfo
 }
@@ -153,9 +290,19 @@ func (bc BridgeConfig) FormatUsername(userID string) string {
 	return buffer.String()
 }
 
-func (bc BridgeConfig) FormatDisplayname(user *discordgo.User) string {
+type DisplaynameParams struct {
+	*discordgo.User
+	Webhook     bool
+	Application bool
+}
+
+func (bc BridgeConfig) FormatDisplayname(user *discordgo.User, webhook, application bool) string {
 	var buffer strings.Builder
-	_ = bc.displaynameTemplate.Execute(&buffer, user)
+	_ = bc.displaynameTemplate.Execute(&buffer, &DisplaynameParams{
+		User:        user,
+		Webhook:     webhook,
+		Application: application,
+	})
 	return buffer.String()
 }
 

config/upgrade.go

@@ -1,5 +1,5 @@
 // mautrix-discord - A Matrix-Discord puppeting bridge.
-// Copyright (C) 2022 Tulir Asokan
+// Copyright (C) 2023 Tulir Asokan
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU Affero General Public License as published by
@@ -25,11 +25,21 @@ import (
 func DoUpgrade(helper *up.Helper) {
 	bridgeconfig.Upgrader.DoUpgrade(helper)
 
+	helper.Copy(up.Str|up.Null, "homeserver", "public_address")
+
 	helper.Copy(up.Str, "bridge", "username_template")
 	helper.Copy(up.Str, "bridge", "displayname_template")
 	helper.Copy(up.Str, "bridge", "channel_name_template")
 	helper.Copy(up.Str, "bridge", "guild_name_template")
-	helper.Copy(up.Bool, "bridge", "private_chat_portal_meta")
+	if legacyPrivateChatPortalMeta, ok := helper.Get(up.Bool, "bridge", "private_chat_portal_meta"); ok {
+		updatedPrivateChatPortalMeta := "default"
+		if legacyPrivateChatPortalMeta == "true" {
+			updatedPrivateChatPortalMeta = "always"
+		}
+		helper.Set(up.Str, updatedPrivateChatPortalMeta, "bridge", "private_chat_portal_meta")
+	} else {
+		helper.Copy(up.Str, "bridge", "private_chat_portal_meta")
+	}
 	helper.Copy(up.Int, "bridge", "startup_private_channel_create_limit")
 	helper.Copy(up.Int, "bridge", "portal_message_buffer")
 	helper.Copy(up.Bool, "bridge", "delivery_receipts")
@@ -45,6 +55,19 @@ func DoUpgrade(helper *up.Helper) {
 	helper.Copy(up.Bool, "bridge", "delete_portal_on_channel_delete")
 	helper.Copy(up.Bool, "bridge", "delete_guild_on_leave")
 	helper.Copy(up.Bool, "bridge", "federate_rooms")
+	helper.Copy(up.Bool, "bridge", "prefix_webhook_messages")
+	helper.Copy(up.Bool, "bridge", "enable_webhook_avatars")
+	helper.Copy(up.Bool, "bridge", "use_discord_cdn_upload")
+	helper.Copy(up.Bool, "bridge", "media_patterns", "enabled")
+	helper.Copy(up.Str, "bridge", "cache_media")
+	helper.Copy(up.Str|up.Null, "bridge", "media_patterns", "attachments")
+	helper.Copy(up.Str|up.Null, "bridge", "media_patterns", "emojis")
+	helper.Copy(up.Str|up.Null, "bridge", "media_patterns", "stickers")
+	helper.Copy(up.Str|up.Null, "bridge", "media_patterns", "avatars")
+	helper.Copy(up.Str, "bridge", "animated_sticker", "target")
+	helper.Copy(up.Int, "bridge", "animated_sticker", "args", "width")
+	helper.Copy(up.Int, "bridge", "animated_sticker", "args", "height")
+	helper.Copy(up.Int, "bridge", "animated_sticker", "args", "fps")
 	helper.Copy(up.Map, "bridge", "double_puppet_server_map")
 	helper.Copy(up.Bool, "bridge", "double_puppet_allow_discovery")
 	helper.Copy(up.Map, "bridge", "login_shared_secret_map")
@@ -53,17 +76,35 @@ func DoUpgrade(helper *up.Helper) {
 	helper.Copy(up.Str, "bridge", "management_room_text", "welcome_connected")
 	helper.Copy(up.Str, "bridge", "management_room_text", "welcome_unconnected")
 	helper.Copy(up.Str|up.Null, "bridge", "management_room_text", "additional_help")
+	helper.Copy(up.Bool, "bridge", "backfill", "enabled")
+	helper.Copy(up.Int, "bridge", "backfill", "forward_limits", "initial", "dm")
+	helper.Copy(up.Int, "bridge", "backfill", "forward_limits", "initial", "channel")
+	helper.Copy(up.Int, "bridge", "backfill", "forward_limits", "initial", "thread")
+	helper.Copy(up.Int, "bridge", "backfill", "forward_limits", "missed", "dm")
+	helper.Copy(up.Int, "bridge", "backfill", "forward_limits", "missed", "channel")
+	helper.Copy(up.Int, "bridge", "backfill", "forward_limits", "missed", "thread")
+	helper.Copy(up.Int, "bridge", "backfill", "max_guild_members")
 	helper.Copy(up.Bool, "bridge", "encryption", "allow")
 	helper.Copy(up.Bool, "bridge", "encryption", "default")
 	helper.Copy(up.Bool, "bridge", "encryption", "require")
 	helper.Copy(up.Bool, "bridge", "encryption", "appservice")
 	helper.Copy(up.Bool, "bridge", "encryption", "allow_key_sharing")
+	helper.Copy(up.Bool, "bridge", "encryption", "plaintext_mentions")
+	helper.Copy(up.Bool, "bridge", "encryption", "delete_keys", "delete_outbound_on_ack")
+	helper.Copy(up.Bool, "bridge", "encryption", "delete_keys", "dont_store_outbound")
+	helper.Copy(up.Bool, "bridge", "encryption", "delete_keys", "ratchet_on_decrypt")
+	helper.Copy(up.Bool, "bridge", "encryption", "delete_keys", "delete_fully_used_on_decrypt")
+	helper.Copy(up.Bool, "bridge", "encryption", "delete_keys", "delete_prev_on_new_session")
+	helper.Copy(up.Bool, "bridge", "encryption", "delete_keys", "delete_on_device_delete")
+	helper.Copy(up.Bool, "bridge", "encryption", "delete_keys", "periodically_delete_expired")
+	helper.Copy(up.Bool, "bridge", "encryption", "delete_keys", "delete_outdated_inbound")
 	helper.Copy(up.Str, "bridge", "encryption", "verification_levels", "receive")
 	helper.Copy(up.Str, "bridge", "encryption", "verification_levels", "send")
 	helper.Copy(up.Str, "bridge", "encryption", "verification_levels", "share")
 	helper.Copy(up.Bool, "bridge", "encryption", "rotation", "enable_custom")
 	helper.Copy(up.Int, "bridge", "encryption", "rotation", "milliseconds")
 	helper.Copy(up.Int, "bridge", "encryption", "rotation", "messages")
+	helper.Copy(up.Bool, "bridge", "encryption", "rotation", "disable_device_change_key_rotation")
 
 	helper.Copy(up.Str, "bridge", "provisioning", "prefix")
 	if secret, ok := helper.Get(up.Str, "bridge", "provisioning", "shared_secret"); !ok || secret == "generate" {

custompuppet.go

@@ -26,7 +26,7 @@ func (br *DiscordBridge) newDoublePuppetClient(mxid id.UserID, accessToken strin
 	homeserverURL, found := br.Config.Bridge.DoublePuppetServerMap[homeserver]
 	if !found {
 		if homeserver == br.AS.HomeserverDomain {
-			homeserverURL = br.AS.HomeserverURL
+			homeserverURL = ""
 		} else if br.Config.Bridge.DoublePuppetAllowDiscovery {
 			resp, err := mautrix.DiscoverClientAPI(homeserver)
 			if err != nil {
@@ -40,16 +40,7 @@ func (br *DiscordBridge) newDoublePuppetClient(mxid id.UserID, accessToken strin
 		}
 	}
 
-	client, err := mautrix.NewClient(homeserverURL, mxid, accessToken)
-	if err != nil {
-		return nil, err
-	}
-
-	client.Logger = br.AS.Log.Sub(mxid.String())
-	client.Client = br.AS.HTTPClient
-	client.DefaultHTTPRetries = br.AS.DefaultHTTPRetries
-
-	return client, nil
+	return br.AS.NewExternalMautrixClient(mxid, accessToken, homeserverURL)
 }
 
 func (puppet *Puppet) clearCustomMXID() {
@@ -111,13 +102,17 @@ func (puppet *Puppet) tryRelogin(cause error, action string) bool {
 	if !puppet.bridge.Config.CanAutoDoublePuppet(puppet.CustomMXID) {
 		return false
 	}
-	puppet.log.Debugfln("Trying to relogin after '%v' while %s", cause, action)
+	log := puppet.log.With().
+		AnErr("cause_error", cause).
+		Str("while_action", action).
+		Logger()
+	log.Debug().Msg("Trying to relogin")
 	accessToken, err := puppet.loginWithSharedSecret(puppet.CustomMXID)
 	if err != nil {
-		puppet.log.Errorfln("Failed to relogin after '%v' while %s: %v", cause, action, err)
+		log.Error().Err(err).Msg("Failed to relogin")
 		return false
 	}
-	puppet.log.Infofln("Successfully relogined after '%v' while %s", cause, action)
+	log.Info().Msg("Successfully relogined")
 	puppet.AccessToken = accessToken
 	puppet.Update()
 	return true
@@ -125,7 +120,7 @@ func (puppet *Puppet) tryRelogin(cause error, action string) bool {
 
 func (puppet *Puppet) loginWithSharedSecret(mxid id.UserID) (string, error) {
 	_, homeserver, _ := mxid.Parse()
-	puppet.log.Debugfln("Logging into %s with shared secret", mxid)
+	puppet.log.Debug().Str("user_id", mxid.String()).Msg("Logging into double puppet target with shared secret")
 	loginSecret := puppet.bridge.Config.Bridge.LoginSharedSecretMap[homeserver]
 	client, err := puppet.bridge.newDoublePuppetClient(mxid, "")
 	if err != nil {

database/database.go

@@ -21,7 +21,6 @@ type Database struct {
 	Message  *MessageQuery
 	Thread   *ThreadQuery
 	Reaction *ReactionQuery
-	Emoji    *EmojiQuery
 	Guild    *GuildQuery
 	Role     *RoleQuery
 	File     *FileQuery
@@ -54,10 +53,6 @@ func New(baseDB *dbutil.Database, log maulogger.Logger) *Database {
 		db:  db,
 		log: log.Sub("Reaction"),
 	}
-	db.Emoji = &EmojiQuery{
-		db:  db,
-		log: log.Sub("Emoji"),
-	}
 	db.Guild = &GuildQuery{
 		db:  db,
 		log: log.Sub("Guild"),
@@ -73,9 +68,10 @@ func New(baseDB *dbutil.Database, log maulogger.Logger) *Database {
 	return db
 }
 
-func strPtr(val string) *string {
+func strPtr[T ~string](val T) *string {
 	if val == "" {
 		return nil
 	}
-	return &val
+	valStr := string(val)
+	return &valStr
 }

database/emoji.go

@@ -1,99 +0,0 @@
-package database
-
-import (
-	"database/sql"
-	"errors"
-
-	log "maunium.net/go/maulogger/v2"
-
-	"maunium.net/go/mautrix/id"
-	"maunium.net/go/mautrix/util/dbutil"
-)
-
-type EmojiQuery struct {
-	db  *Database
-	log log.Logger
-}
-
-const (
-	emojiSelect = "SELECT discord_id, discord_name, matrix_url FROM emoji"
-)
-
-func (eq *EmojiQuery) New() *Emoji {
-	return &Emoji{
-		db:  eq.db,
-		log: eq.log,
-	}
-}
-
-func (eq *EmojiQuery) GetByDiscordID(discordID string) *Emoji {
-	query := emojiSelect + " WHERE discord_id=$1"
-	return eq.get(query, discordID)
-}
-
-func (eq *EmojiQuery) GetByMatrixURL(matrixURL id.ContentURI) *Emoji {
-	query := emojiSelect + " WHERE matrix_url=$1"
-	return eq.get(query, matrixURL.String())
-}
-
-func (eq *EmojiQuery) get(query string, args ...interface{}) *Emoji {
-	return eq.New().Scan(eq.db.QueryRow(query, args...))
-}
-
-type Emoji struct {
-	db  *Database
-	log log.Logger
-
-	DiscordID   string
-	DiscordName string
-
-	MatrixURL id.ContentURI
-}
-
-func (e *Emoji) Scan(row dbutil.Scannable) *Emoji {
-	var matrixURL sql.NullString
-
-	err := row.Scan(&e.DiscordID, &e.DiscordName, &matrixURL)
-	if err != nil {
-		if !errors.Is(err, sql.ErrNoRows) {
-			e.log.Errorln("Database scan failed:", err)
-			panic(err)
-		}
-		return nil
-	}
-
-	e.MatrixURL, _ = id.ParseContentURI(matrixURL.String)
-	return e
-}
-
-func (e *Emoji) Insert() {
-	query := "INSERT INTO emoji" +
-		" (discord_id, discord_name, matrix_url)" +
-		" VALUES ($1, $2, $3);"
-
-	_, err := e.db.Exec(query, e.DiscordID, e.DiscordName, e.MatrixURL.String())
-
-	if err != nil {
-		e.log.Warnfln("Failed to insert emoji %s: %v", e.DiscordID, err)
-		panic(err)
-	}
-}
-
-func (e *Emoji) Delete() {
-	query := "DELETE FROM emoji WHERE discord_id=$1"
-
-	_, err := e.db.Exec(query, e.DiscordID)
-	if err != nil {
-		e.log.Warnfln("Failed to delete emoji %s: %v", e.DiscordID, err)
-		panic(err)
-	}
-}
-
-func (e *Emoji) APIName() string {
-	if e.DiscordID != "" && e.DiscordName != "" {
-		return e.DiscordName + ":" + e.DiscordID
-	} else if e.DiscordName != "" {
-		return e.DiscordName
-	}
-	return e.DiscordID
-}

database/file.go

@@ -20,10 +20,10 @@ type FileQuery struct {
 
 // language=postgresql
 const (
-	fileSelect = "SELECT url, encrypted, id, mxc, size, width, height, mime_type, decryption_info, timestamp FROM discord_file"
+	fileSelect = "SELECT url, encrypted, mxc, id, emoji_name, size, width, height, mime_type, decryption_info, timestamp FROM discord_file"
 	fileInsert = `
-		INSERT INTO discord_file (url, encrypted, id, mxc, size, width, height, mime_type, decryption_info, timestamp)
-		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)
+		INSERT INTO discord_file (url, encrypted, mxc, id, emoji_name, size, width, height, mime_type, decryption_info, timestamp)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11)
 	`
 )
 
@@ -39,15 +39,21 @@ func (fq *FileQuery) Get(url string, encrypted bool) *File {
 	return fq.New().Scan(fq.db.QueryRow(query, url, encrypted))
 }
 
+func (fq *FileQuery) GetEmojiByMXC(mxc id.ContentURI) *File {
+	query := fileSelect + " WHERE mxc=$1 AND emoji_name<>'' LIMIT 1"
+	return fq.New().Scan(fq.db.QueryRow(query, mxc.String()))
+}
+
 type File struct {
 	db  *Database
 	log log.Logger
 
 	URL       string
 	Encrypted bool
+	MXC       id.ContentURI
 
-	ID  string
-	MXC id.ContentURI
+	ID        string
+	EmojiName string
 
 	Size     int
 	Width    int
@@ -55,16 +61,15 @@ type File struct {
 	MimeType string
 
 	DecryptionInfo *attachment.EncryptedFile
-
-	Timestamp time.Time
+	Timestamp      time.Time
 }
 
 func (f *File) Scan(row dbutil.Scannable) *File {
-	var fileID, decryptionInfo sql.NullString
+	var fileID, emojiName, decryptionInfo sql.NullString
 	var width, height sql.NullInt32
 	var timestamp int64
 	var mxc string
-	err := row.Scan(&f.URL, &f.Encrypted, &fileID, &mxc, &f.Size, &width, &height, &f.MimeType, &decryptionInfo, &timestamp)
+	err := row.Scan(&f.URL, &f.Encrypted, &mxc, &fileID, &emojiName, &f.Size, &width, &height, &f.MimeType, &decryptionInfo, &timestamp)
 	if err != nil {
 		if !errors.Is(err, sql.ErrNoRows) {
 			f.log.Errorln("Database scan failed:", err)
@@ -73,7 +78,8 @@ func (f *File) Scan(row dbutil.Scannable) *File {
 		return nil
 	}
 	f.ID = fileID.String
-	f.Timestamp = time.UnixMilli(timestamp)
+	f.EmojiName = emojiName.String
+	f.Timestamp = time.UnixMilli(timestamp).UTC()
 	f.Width = int(width.Int32)
 	f.Height = int(height.Int32)
 	f.MXC, err = id.ParseContentURI(mxc)
@@ -114,7 +120,7 @@ func (f *File) Insert(txn dbutil.Execable) {
 		decryptionInfoStr.String = string(decryptionInfo)
 	}
 	_, err := txn.Exec(fileInsert,
-		f.URL, f.Encrypted, strPtr(f.ID), f.MXC.String(), f.Size,
+		f.URL, f.Encrypted, f.MXC.String(), strPtr(f.ID), strPtr(f.EmojiName), f.Size,
 		positiveIntToNullInt32(f.Width), positiveIntToNullInt32(f.Height), f.MimeType,
 		decryptionInfoStr, f.Timestamp.UnixMilli(),
 	)

database/guild.go

@@ -3,6 +3,8 @@ package database
 import (
 	"database/sql"
 	"errors"
+	"fmt"
+	"strings"
 
 	log "maunium.net/go/maulogger/v2"
 	"maunium.net/go/mautrix/id"
@@ -10,13 +12,76 @@ import (
 	"maunium.net/go/mautrix/util/dbutil"
 )
 
+type GuildBridgingMode int
+
+const (
+	// GuildBridgeNothing tells the bridge to never bridge messages, not even checking if a portal exists.
+	GuildBridgeNothing GuildBridgingMode = iota
+	// GuildBridgeIfPortalExists tells the bridge to bridge messages in channels that already have portals.
+	GuildBridgeIfPortalExists
+	// GuildBridgeCreateOnMessage tells the bridge to create portals as soon as a message is received.
+	GuildBridgeCreateOnMessage
+	// GuildBridgeEverything tells the bridge to proactively create portals on startup and when receiving channel create notifications.
+	GuildBridgeEverything
+
+	GuildBridgeInvalid GuildBridgingMode = -1
+)
+
+func ParseGuildBridgingMode(str string) GuildBridgingMode {
+	str = strings.ToLower(str)
+	str = strings.ReplaceAll(str, "-", "")
+	str = strings.ReplaceAll(str, "_", "")
+	switch str {
+	case "nothing", "0":
+		return GuildBridgeNothing
+	case "ifportalexists", "1":
+		return GuildBridgeIfPortalExists
+	case "createonmessage", "2":
+		return GuildBridgeCreateOnMessage
+	case "everything", "3":
+		return GuildBridgeEverything
+	default:
+		return GuildBridgeInvalid
+	}
+}
+
+func (gbm GuildBridgingMode) String() string {
+	switch gbm {
+	case GuildBridgeNothing:
+		return "nothing"
+	case GuildBridgeIfPortalExists:
+		return "if-portal-exists"
+	case GuildBridgeCreateOnMessage:
+		return "create-on-message"
+	case GuildBridgeEverything:
+		return "everything"
+	default:
+		return ""
+	}
+}
+
+func (gbm GuildBridgingMode) Description() string {
+	switch gbm {
+	case GuildBridgeNothing:
+		return "never bridge messages"
+	case GuildBridgeIfPortalExists:
+		return "bridge messages in existing portals"
+	case GuildBridgeCreateOnMessage:
+		return "bridge all messages and create portals on first message"
+	case GuildBridgeEverything:
+		return "bridge all messages and create portals proactively"
+	default:
+		return ""
+	}
+}
+
 type GuildQuery struct {
 	db  *Database
 	log log.Logger
 }
 
 const (
-	guildSelect = "SELECT dcid, mxid, plain_name, name, name_set, avatar, avatar_url, avatar_set, auto_bridge_channels FROM guild"
+	guildSelect = "SELECT dcid, mxid, plain_name, name, name_set, avatar, avatar_url, avatar_set, bridging_mode FROM guild"
 )
 
 func (gq *GuildQuery) New() *Guild {
@@ -67,13 +132,13 @@ type Guild struct {
 	AvatarURL id.ContentURI
 	AvatarSet bool
 
-	AutoBridgeChannels bool
+	BridgingMode GuildBridgingMode
 }
 
 func (g *Guild) Scan(row dbutil.Scannable) *Guild {
 	var mxid sql.NullString
 	var avatarURL string
-	err := row.Scan(&g.ID, &mxid, &g.PlainName, &g.Name, &g.NameSet, &g.Avatar, &avatarURL, &g.AvatarSet, &g.AutoBridgeChannels)
+	err := row.Scan(&g.ID, &mxid, &g.PlainName, &g.Name, &g.NameSet, &g.Avatar, &avatarURL, &g.AvatarSet, &g.BridgingMode)
 	if err != nil {
 		if !errors.Is(err, sql.ErrNoRows) {
 			g.log.Errorln("Database scan failed:", err)
@@ -82,6 +147,9 @@ func (g *Guild) Scan(row dbutil.Scannable) *Guild {
 
 		return nil
 	}
+	if g.BridgingMode < GuildBridgeNothing || g.BridgingMode > GuildBridgeEverything {
+		panic(fmt.Errorf("invalid guild bridging mode %d in guild %s", g.BridgingMode, g.ID))
+	}
 	g.MXID = id.RoomID(mxid.String)
 	g.AvatarURL, _ = id.ParseContentURI(avatarURL)
 	return g
@@ -96,10 +164,10 @@ func (g *Guild) mxidPtr() *id.RoomID {
 
 func (g *Guild) Insert() {
 	query := `
-		INSERT INTO guild (dcid, mxid, plain_name, name, name_set, avatar, avatar_url, avatar_set, auto_bridge_channels)
+		INSERT INTO guild (dcid, mxid, plain_name, name, name_set, avatar, avatar_url, avatar_set, bridging_mode)
 		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
 	`
-	_, err := g.db.Exec(query, g.ID, g.mxidPtr(), g.PlainName, g.Name, g.NameSet, g.Avatar, g.AvatarURL.String(), g.AvatarSet, g.AutoBridgeChannels)
+	_, err := g.db.Exec(query, g.ID, g.mxidPtr(), g.PlainName, g.Name, g.NameSet, g.Avatar, g.AvatarURL.String(), g.AvatarSet, g.BridgingMode)
 	if err != nil {
 		g.log.Warnfln("Failed to insert %s: %v", g.ID, err)
 		panic(err)
@@ -108,10 +176,10 @@ func (g *Guild) Insert() {
 
 func (g *Guild) Update() {
 	query := `
-		UPDATE guild SET mxid=$1, plain_name=$2, name=$3, name_set=$4, avatar=$5, avatar_url=$6, avatar_set=$7, auto_bridge_channels=$8
+		UPDATE guild SET mxid=$1, plain_name=$2, name=$3, name_set=$4, avatar=$5, avatar_url=$6, avatar_set=$7, bridging_mode=$8
 		WHERE dcid=$9
 	`
-	_, err := g.db.Exec(query, g.mxidPtr(), g.PlainName, g.Name, g.NameSet, g.Avatar, g.AvatarURL.String(), g.AvatarSet, g.AutoBridgeChannels, g.ID)
+	_, err := g.db.Exec(query, g.mxidPtr(), g.PlainName, g.Name, g.NameSet, g.Avatar, g.AvatarURL.String(), g.AvatarSet, g.BridgingMode, g.ID)
 	if err != nil {
 		g.log.Warnfln("Failed to update %s: %v", g.ID, err)
 		panic(err)

database/message.go

@@ -19,7 +19,7 @@ type MessageQuery struct {
 }
 
 const (
-	messageSelect = "SELECT dcid, dc_attachment_id, dc_edit_index, dc_chan_id, dc_chan_receiver, dc_sender, timestamp, dc_thread_id, mxid FROM message"
+	messageSelect = "SELECT dcid, dc_attachment_id, dc_chan_id, dc_chan_receiver, dc_sender, timestamp, dc_edit_timestamp, dc_thread_id, mxid, sender_mxid FROM message"
 )
 
 func (mq *MessageQuery) New() *Message {
@@ -46,17 +46,17 @@ func (mq *MessageQuery) scanAll(rows dbutil.Rows, err error) []*Message {
 }
 
 func (mq *MessageQuery) GetByDiscordID(key PortalKey, discordID string) []*Message {
-	query := messageSelect + " WHERE dc_chan_id=$1 AND dc_chan_receiver=$2 AND dcid=$3 AND dc_edit_index=0 ORDER BY dc_attachment_id ASC"
+	query := messageSelect + " WHERE dc_chan_id=$1 AND dc_chan_receiver=$2 AND dcid=$3 ORDER BY dc_attachment_id ASC"
 	return mq.scanAll(mq.db.Query(query, key.ChannelID, key.Receiver, discordID))
 }
 
 func (mq *MessageQuery) GetFirstByDiscordID(key PortalKey, discordID string) *Message {
-	query := messageSelect + " WHERE dc_chan_id=$1 AND dc_chan_receiver=$2 AND dcid=$3 AND dc_edit_index=0 ORDER BY dc_attachment_id ASC LIMIT 1"
+	query := messageSelect + " WHERE dc_chan_id=$1 AND dc_chan_receiver=$2 AND dcid=$3 ORDER BY dc_attachment_id ASC LIMIT 1"
 	return mq.New().Scan(mq.db.QueryRow(query, key.ChannelID, key.Receiver, discordID))
 }
 
 func (mq *MessageQuery) GetLastByDiscordID(key PortalKey, discordID string) *Message {
-	query := messageSelect + " WHERE dc_chan_id=$1 AND dc_chan_receiver=$2 AND dcid=$3 AND dc_edit_index=0 ORDER BY dc_attachment_id DESC LIMIT 1"
+	query := messageSelect + " WHERE dc_chan_id=$1 AND dc_chan_receiver=$2 AND dcid=$3 ORDER BY dc_attachment_id DESC LIMIT 1"
 	return mq.New().Scan(mq.db.QueryRow(query, key.ChannelID, key.Receiver, discordID))
 }
 
@@ -66,10 +66,15 @@ func (mq *MessageQuery) GetClosestBefore(key PortalKey, threadID string, ts time
 }
 
 func (mq *MessageQuery) GetLastInThread(key PortalKey, threadID string) *Message {
-	query := messageSelect + " WHERE dc_chan_id=$1 AND dc_chan_receiver=$2 AND dc_thread_id=$3 AND dc_edit_index=0 ORDER BY timestamp DESC, dc_attachment_id DESC LIMIT 1"
+	query := messageSelect + " WHERE dc_chan_id=$1 AND dc_chan_receiver=$2 AND dc_thread_id=$3 ORDER BY timestamp DESC, dc_attachment_id DESC LIMIT 1"
 	return mq.New().Scan(mq.db.QueryRow(query, key.ChannelID, key.Receiver, threadID))
 }
 
+func (mq *MessageQuery) GetLast(key PortalKey) *Message {
+	query := messageSelect + " WHERE dc_chan_id=$1 AND dc_chan_receiver=$2 ORDER BY timestamp DESC LIMIT 1"
+	return mq.New().Scan(mq.db.QueryRow(query, key.ChannelID, key.Receiver))
+}
+
 func (mq *MessageQuery) DeleteAll(key PortalKey) {
 	query := "DELETE FROM message WHERE dc_chan_id=$1 AND dc_chan_receiver=$2"
 	_, err := mq.db.Exec(query, key.ChannelID, key.Receiver)
@@ -90,19 +95,51 @@ func (mq *MessageQuery) GetByMXID(key PortalKey, mxid id.EventID) *Message {
 	return mq.New().Scan(row)
 }
 
+func (mq *MessageQuery) MassInsert(key PortalKey, msgs []Message) {
+	if len(msgs) == 0 {
+		return
+	}
+	valueStringFormat := "($%d, $%d, $1, $2, $%d, $%d, $%d, $%d, $%d, $%d)"
+	if mq.db.Dialect == dbutil.SQLite {
+		valueStringFormat = strings.ReplaceAll(valueStringFormat, "$", "?")
+	}
+	params := make([]interface{}, 2+len(msgs)*8)
+	placeholders := make([]string, len(msgs))
+	params[0] = key.ChannelID
+	params[1] = key.Receiver
+	for i, msg := range msgs {
+		baseIndex := 2 + i*7
+		params[baseIndex] = msg.DiscordID
+		params[baseIndex+1] = msg.AttachmentID
+		params[baseIndex+2] = msg.SenderID
+		params[baseIndex+3] = msg.Timestamp.UnixMilli()
+		params[baseIndex+4] = msg.editTimestampVal()
+		params[baseIndex+5] = msg.ThreadID
+		params[baseIndex+6] = msg.MXID
+		params[baseIndex+7] = msg.SenderMXID.String()
+		placeholders[i] = fmt.Sprintf(valueStringFormat, baseIndex+1, baseIndex+2, baseIndex+3, baseIndex+4, baseIndex+5, baseIndex+6, baseIndex+7, baseIndex+8)
+	}
+	_, err := mq.db.Exec(fmt.Sprintf(messageMassInsertTemplate, strings.Join(placeholders, ", ")), params...)
+	if err != nil {
+		mq.log.Warnfln("Failed to insert %d messages: %v", len(msgs), err)
+		panic(err)
+	}
+}
+
 type Message struct {
 	db  *Database
 	log log.Logger
 
-	DiscordID    string
-	AttachmentID string
-	EditIndex    int
-	Channel      PortalKey
-	SenderID     string
-	Timestamp    time.Time
-	ThreadID     string
+	DiscordID     string
+	AttachmentID  string
+	Channel       PortalKey
+	SenderID      string
+	Timestamp     time.Time
+	EditTimestamp time.Time
+	ThreadID      string
 
-	MXID id.EventID
+	MXID       id.EventID
+	SenderMXID id.UserID
 }
 
 func (m *Message) DiscordProtoChannelID() string {
@@ -114,9 +151,9 @@ func (m *Message) DiscordProtoChannelID() string {
 }
 
 func (m *Message) Scan(row dbutil.Scannable) *Message {
-	var ts int64
+	var ts, editTS int64
 
-	err := row.Scan(&m.DiscordID, &m.AttachmentID, &m.EditIndex, &m.Channel.ChannelID, &m.Channel.Receiver, &m.SenderID, &ts, &m.ThreadID, &m.MXID)
+	err := row.Scan(&m.DiscordID, &m.AttachmentID, &m.Channel.ChannelID, &m.Channel.Receiver, &m.SenderID, &ts, &editTS, &m.ThreadID, &m.MXID, &m.SenderMXID)
 	if err != nil {
 		if !errors.Is(err, sql.ErrNoRows) {
 			m.log.Errorln("Database scan failed:", err)
@@ -127,7 +164,10 @@ func (m *Message) Scan(row dbutil.Scannable) *Message {
 	}
 
 	if ts != 0 {
-		m.Timestamp = time.UnixMilli(ts)
+		m.Timestamp = time.UnixMilli(ts).UTC()
+	}
+	if editTS != 0 {
+		m.EditTimestamp = time.Unix(0, editTS).UTC()
 	}
 
 	return m
@@ -135,39 +175,47 @@ func (m *Message) Scan(row dbutil.Scannable) *Message {
 
 const messageInsertQuery = `
 	INSERT INTO message (
-		dcid, dc_attachment_id, dc_edit_index, dc_chan_id, dc_chan_receiver, dc_sender, timestamp, dc_thread_id, mxid
+		dcid, dc_attachment_id, dc_chan_id, dc_chan_receiver, dc_sender, timestamp, dc_edit_timestamp, dc_thread_id, mxid, sender_mxid
 	)
-	VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
+	VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)
 `
 
-var messageMassInsertTemplate = strings.Replace(messageInsertQuery, "($1, $2, $3, $4, $5, $6, $7, $8, $9)", "%s", 1)
+var messageMassInsertTemplate = strings.Replace(messageInsertQuery, "($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)", "%s", 1)
 
 type MessagePart struct {
 	AttachmentID string
 	MXID         id.EventID
 }
 
-func (m *Message) MassInsert(msgs []MessagePart) {
+func (m *Message) editTimestampVal() int64 {
+	if m.EditTimestamp.IsZero() {
+		return 0
+	}
+	return m.EditTimestamp.UnixNano()
+}
+
+func (m *Message) MassInsertParts(msgs []MessagePart) {
 	if len(msgs) == 0 {
 		return
 	}
-	valueStringFormat := "($1, $%d, $2, $3, $4, $5, $6, $7, $%d)"
+	valueStringFormat := "($1, $%d, $2, $3, $4, $5, $6, $7, $%d, $8)"
 	if m.db.Dialect == dbutil.SQLite {
 		valueStringFormat = strings.ReplaceAll(valueStringFormat, "$", "?")
 	}
-	params := make([]interface{}, 7+len(msgs)*2)
+	params := make([]interface{}, 8+len(msgs)*2)
 	placeholders := make([]string, len(msgs))
 	params[0] = m.DiscordID
-	params[1] = m.EditIndex
-	params[2] = m.Channel.ChannelID
-	params[3] = m.Channel.Receiver
-	params[4] = m.SenderID
-	params[5] = m.Timestamp.UnixMilli()
+	params[1] = m.Channel.ChannelID
+	params[2] = m.Channel.Receiver
+	params[3] = m.SenderID
+	params[4] = m.Timestamp.UnixMilli()
+	params[5] = m.editTimestampVal()
 	params[6] = m.ThreadID
+	params[7] = m.SenderMXID.String()
 	for i, msg := range msgs {
-		params[7+i*2] = msg.AttachmentID
-		params[7+i*2+1] = msg.MXID
-		placeholders[i] = fmt.Sprintf(valueStringFormat, 7+i*2+1, 7+i*2+2)
+		params[8+i*2] = msg.AttachmentID
+		params[8+i*2+1] = msg.MXID
+		placeholders[i] = fmt.Sprintf(valueStringFormat, 8+i*2+1, 8+i*2+2)
 	}
 	_, err := m.db.Exec(fmt.Sprintf(messageMassInsertTemplate, strings.Join(placeholders, ", ")), params...)
 	if err != nil {
@@ -178,8 +226,8 @@ func (m *Message) MassInsert(msgs []MessagePart) {
 
 func (m *Message) Insert() {
 	_, err := m.db.Exec(messageInsertQuery,
-		m.DiscordID, m.AttachmentID, m.EditIndex, m.Channel.ChannelID, m.Channel.Receiver, m.SenderID,
-		m.Timestamp.UnixMilli(), m.ThreadID, m.MXID)
+		m.DiscordID, m.AttachmentID, m.Channel.ChannelID, m.Channel.Receiver, m.SenderID,
+		m.Timestamp.UnixMilli(), m.editTimestampVal(), m.ThreadID, m.MXID, m.SenderMXID.String())
 
 	if err != nil {
 		m.log.Warnfln("Failed to insert %s@%s: %v", m.DiscordID, m.Channel, err)
@@ -187,6 +235,20 @@ func (m *Message) Insert() {
 	}
 }
 
+const editUpdateQuery = `
+	UPDATE message
+	SET dc_edit_timestamp=$1
+	WHERE dcid=$2 AND dc_attachment_id=$3 AND dc_chan_id=$4 AND dc_chan_receiver=$5 AND dc_edit_timestamp<$1
+`
+
+func (m *Message) UpdateEditTimestamp(ts time.Time) {
+	_, err := m.db.Exec(editUpdateQuery, ts.UnixNano(), m.DiscordID, m.AttachmentID, m.Channel.ChannelID, m.Channel.Receiver)
+	if err != nil {
+		m.log.Warnfln("Failed to update edit timestamp of %s@%s: %v", m.DiscordID, m.Channel, err)
+		panic(err)
+	}
+}
+
 func (m *Message) Delete() {
 	query := "DELETE FROM message WHERE dcid=$1 AND dc_chan_id=$2 AND dc_chan_receiver=$3 AND dc_attachment_id=$4"
 	_, err := m.db.Exec(query, m.DiscordID, m.Channel.ChannelID, m.Channel.Receiver, m.AttachmentID)

database/portal.go

@@ -15,8 +15,8 @@ import (
 const (
 	portalSelect = `
 		SELECT dcid, receiver, type, other_user_id, dc_guild_id, dc_parent_id, mxid,
-		       plain_name, name, name_set, topic, topic_set, avatar, avatar_url, avatar_set,
-		       encrypted, in_space, first_event_id
+		       plain_name, name, name_set, friend_nick, topic, topic_set, avatar, avatar_url, avatar_set,
+		       encrypted, in_space, first_event_id, relay_webhook_id, relay_webhook_secret
 		FROM portal
 	`
 )
@@ -68,6 +68,10 @@ func (pq *PortalQuery) GetByMXID(mxid id.RoomID) *Portal {
 	return pq.get(portalSelect+" WHERE mxid=$1", mxid)
 }
 
+func (pq *PortalQuery) FindPrivateChatBetween(id, receiver string) *Portal {
+	return pq.get(portalSelect+" WHERE other_user_id=$1 AND receiver=$2 AND type=$3", id, receiver, discordgo.ChannelTypeDM)
+}
+
 func (pq *PortalQuery) FindPrivateChatsWith(id string) []*Portal {
 	return pq.getAll(portalSelect+" WHERE other_user_id=$1 AND type=$2", id, discordgo.ChannelTypeDM)
 }
@@ -109,28 +113,32 @@ type Portal struct {
 
 	MXID id.RoomID
 
-	PlainName string
-	Name      string
-	NameSet   bool
-	Topic     string
-	TopicSet  bool
-	Avatar    string
-	AvatarURL id.ContentURI
-	AvatarSet bool
-	Encrypted bool
-	InSpace   id.RoomID
+	PlainName  string
+	Name       string
+	NameSet    bool
+	FriendNick bool
+	Topic      string
+	TopicSet   bool
+	Avatar     string
+	AvatarURL  id.ContentURI
+	AvatarSet  bool
+	Encrypted  bool
+	InSpace    id.RoomID
 
 	FirstEventID id.EventID
+
+	RelayWebhookID     string
+	RelayWebhookSecret string
 }
 
 func (p *Portal) Scan(row dbutil.Scannable) *Portal {
-	var otherUserID, guildID, parentID, mxid, firstEventID sql.NullString
+	var otherUserID, guildID, parentID, mxid, firstEventID, relayWebhookID, relayWebhookSecret sql.NullString
 	var chanType int32
 	var avatarURL string
 
 	err := row.Scan(&p.Key.ChannelID, &p.Key.Receiver, &chanType, &otherUserID, &guildID, &parentID,
-		&mxid, &p.PlainName, &p.Name, &p.NameSet, &p.Topic, &p.TopicSet, &p.Avatar, &avatarURL, &p.AvatarSet,
-		&p.Encrypted, &p.InSpace, &firstEventID)
+		&mxid, &p.PlainName, &p.Name, &p.NameSet, &p.FriendNick, &p.Topic, &p.TopicSet, &p.Avatar, &avatarURL, &p.AvatarSet,
+		&p.Encrypted, &p.InSpace, &firstEventID, &relayWebhookID, &relayWebhookSecret)
 
 	if err != nil {
 		if err != sql.ErrNoRows {
@@ -148,6 +156,8 @@ func (p *Portal) Scan(row dbutil.Scannable) *Portal {
 	p.Type = discordgo.ChannelType(chanType)
 	p.FirstEventID = id.EventID(firstEventID.String)
 	p.AvatarURL, _ = id.ParseContentURI(avatarURL)
+	p.RelayWebhookID = relayWebhookID.String
+	p.RelayWebhookSecret = relayWebhookSecret.String
 
 	return p
 }
@@ -155,14 +165,14 @@ func (p *Portal) Scan(row dbutil.Scannable) *Portal {
 func (p *Portal) Insert() {
 	query := `
 		INSERT INTO portal (dcid, receiver, type, other_user_id, dc_guild_id, dc_parent_id, mxid,
-		                    plain_name, name, name_set, topic, topic_set, avatar, avatar_url, avatar_set,
-		                    encrypted, in_space, first_event_id)
-		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18)
+		                    plain_name, name, name_set, friend_nick, topic, topic_set, avatar, avatar_url, avatar_set,
+		                    encrypted, in_space, first_event_id, relay_webhook_id, relay_webhook_secret)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20, $21)
 	`
 	_, err := p.db.Exec(query, p.Key.ChannelID, p.Key.Receiver, p.Type,
 		strPtr(p.OtherUserID), strPtr(p.GuildID), strPtr(p.ParentID), strPtr(string(p.MXID)),
-		p.PlainName, p.Name, p.NameSet, p.Topic, p.TopicSet, p.Avatar, p.AvatarURL.String(), p.AvatarSet,
-		p.Encrypted, p.InSpace, p.FirstEventID.String())
+		p.PlainName, p.Name, p.NameSet, p.FriendNick, p.Topic, p.TopicSet, p.Avatar, p.AvatarURL.String(), p.AvatarSet,
+		p.Encrypted, p.InSpace, p.FirstEventID.String(), strPtr(p.RelayWebhookID), strPtr(p.RelayWebhookSecret))
 
 	if err != nil {
 		p.log.Warnfln("Failed to insert %s: %v", p.Key, err)
@@ -174,14 +184,16 @@ func (p *Portal) Update() {
 	query := `
 		UPDATE portal
 		SET type=$1, other_user_id=$2, dc_guild_id=$3, dc_parent_id=$4, mxid=$5,
-			plain_name=$6, name=$7, name_set=$8, topic=$9, topic_set=$10, avatar=$11, avatar_url=$12, avatar_set=$13,
-			encrypted=$14, in_space=$15, first_event_id=$16
-		WHERE dcid=$17 AND receiver=$18
+			plain_name=$6, name=$7, name_set=$8, friend_nick=$9, topic=$10, topic_set=$11,
+			avatar=$12, avatar_url=$13, avatar_set=$14, encrypted=$15, in_space=$16, first_event_id=$17,
+			relay_webhook_id=$18, relay_webhook_secret=$19
+		WHERE dcid=$20 AND receiver=$21
 	`
 	_, err := p.db.Exec(query,
 		p.Type, strPtr(p.OtherUserID), strPtr(p.GuildID), strPtr(p.ParentID), strPtr(string(p.MXID)),
-		p.PlainName, p.Name, p.NameSet, p.Topic, p.TopicSet, p.Avatar, p.AvatarURL.String(), p.AvatarSet,
-		p.Encrypted, p.InSpace, p.FirstEventID.String(),
+		p.PlainName, p.Name, p.NameSet, p.FriendNick, p.Topic, p.TopicSet,
+		p.Avatar, p.AvatarURL.String(), p.AvatarSet, p.Encrypted, p.InSpace, p.FirstEventID.String(),
+		strPtr(p.RelayWebhookID), strPtr(p.RelayWebhookSecret),
 		p.Key.ChannelID, p.Key.Receiver)
 
 	if err != nil {

database/puppet.go

@@ -11,7 +11,7 @@ import (
 
 const (
 	puppetSelect = "SELECT id, name, name_set, avatar, avatar_url, avatar_set," +
-		" custom_mxid, access_token, next_batch" +
+		" contact_info_set, global_name, username, discriminator, is_bot, is_webhook, is_application, custom_mxid, access_token, next_batch" +
 		" FROM puppet "
 )
 
@@ -73,6 +73,15 @@ type Puppet struct {
 	AvatarURL id.ContentURI
 	AvatarSet bool
 
+	ContactInfoSet bool
+
+	GlobalName    string
+	Username      string
+	Discriminator string
+	IsBot         bool
+	IsWebhook     bool
+	IsApplication bool
+
 	CustomMXID  id.UserID
 	AccessToken string
 	NextBatch   string
@@ -82,8 +91,8 @@ func (p *Puppet) Scan(row dbutil.Scannable) *Puppet {
 	var avatarURL string
 	var customMXID, accessToken, nextBatch sql.NullString
 
-	err := row.Scan(&p.ID, &p.Name, &p.NameSet, &p.Avatar, &avatarURL, &p.AvatarSet,
-		&customMXID, &accessToken, &nextBatch)
+	err := row.Scan(&p.ID, &p.Name, &p.NameSet, &p.Avatar, &avatarURL, &p.AvatarSet, &p.ContactInfoSet,
+		&p.GlobalName, &p.Username, &p.Discriminator, &p.IsBot, &p.IsWebhook, &p.IsApplication, &customMXID, &accessToken, &nextBatch)
 
 	if err != nil {
 		if err != sql.ErrNoRows {
@@ -104,11 +113,16 @@ func (p *Puppet) Scan(row dbutil.Scannable) *Puppet {
 
 func (p *Puppet) Insert() {
 	query := `
-		INSERT INTO puppet (id, name, name_set, avatar, avatar_url, avatar_set, custom_mxid, access_token, next_batch)
-		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
+		INSERT INTO puppet (
+			id, name, name_set, avatar, avatar_url, avatar_set, contact_info_set,
+			global_name, username, discriminator, is_bot, is_webhook, is_application,
+			custom_mxid, access_token, next_batch
+		)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16)
 	`
-	_, err := p.db.Exec(query, p.ID, p.Name, p.NameSet, p.Avatar, p.AvatarURL.String(), p.AvatarSet,
-		strPtr(string(p.CustomMXID)), strPtr(p.AccessToken), strPtr(p.NextBatch))
+	_, err := p.db.Exec(query, p.ID, p.Name, p.NameSet, p.Avatar, p.AvatarURL.String(), p.AvatarSet, p.ContactInfoSet,
+		p.GlobalName, p.Username, p.Discriminator, p.IsBot, p.IsWebhook, p.IsApplication,
+		strPtr(p.CustomMXID), strPtr(p.AccessToken), strPtr(p.NextBatch))
 
 	if err != nil {
 		p.log.Warnfln("Failed to insert %s: %v", p.ID, err)
@@ -118,13 +132,18 @@ func (p *Puppet) Insert() {
 
 func (p *Puppet) Update() {
 	query := `
-		UPDATE puppet SET name=$1, name_set=$2, avatar=$3, avatar_url=$4, avatar_set=$5,
-		                  custom_mxid=$6, access_token=$7, next_batch=$8
-		WHERE id=$9
+		UPDATE puppet SET name=$1, name_set=$2, avatar=$3, avatar_url=$4, avatar_set=$5, contact_info_set=$6,
+		                  global_name=$7, username=$8, discriminator=$9, is_bot=$10, is_webhook=$11, is_application=$12,
+		                  custom_mxid=$13, access_token=$14, next_batch=$15
+		WHERE id=$16
 	`
-	_, err := p.db.Exec(query, p.Name, p.NameSet, p.Avatar, p.AvatarURL.String(), p.AvatarSet,
-		strPtr(string(p.CustomMXID)), strPtr(p.AccessToken), strPtr(p.NextBatch),
-		p.ID)
+	_, err := p.db.Exec(
+		query,
+		p.Name, p.NameSet, p.Avatar, p.AvatarURL.String(), p.AvatarSet, p.ContactInfoSet,
+		p.GlobalName, p.Username, p.Discriminator, p.IsBot, p.IsWebhook, p.IsApplication,
+		strPtr(p.CustomMXID), strPtr(p.AccessToken), strPtr(p.NextBatch),
+		p.ID,
+	)
 
 	if err != nil {
 		p.log.Warnfln("Failed to update %s: %v", p.ID, err)

database/upgrades/00-latest-revision.sql

@@ -1,4 +1,4 @@
--- v0 -> v12: Latest revision
+-- v0 -> v23 (compatible with v19+): Latest revision
 
 CREATE TABLE guild (
     dcid       TEXT PRIMARY KEY,
@@ -10,7 +10,7 @@ CREATE TABLE guild (
     avatar_url TEXT NOT NULL,
     avatar_set BOOLEAN NOT NULL,
 
-    auto_bridge_channels BOOLEAN NOT NULL
+    bridging_mode INTEGER NOT NULL
 );
 
 CREATE TABLE portal (
@@ -29,6 +29,7 @@ CREATE TABLE portal (
     plain_name TEXT NOT NULL,
     name       TEXT NOT NULL,
     name_set   BOOLEAN NOT NULL,
+    friend_nick BOOLEAN NOT NULL,
     topic      TEXT NOT NULL,
     topic_set  BOOLEAN NOT NULL,
     avatar     TEXT NOT NULL,
@@ -39,6 +40,9 @@ CREATE TABLE portal (
 
     first_event_id TEXT NOT NULL,
 
+    relay_webhook_id     TEXT,
+    relay_webhook_secret TEXT,
+
     PRIMARY KEY (dcid, receiver),
     CONSTRAINT portal_parent_fkey FOREIGN KEY (dc_parent_id, dc_parent_receiver) REFERENCES portal (dcid, receiver) ON DELETE CASCADE,
     CONSTRAINT portal_guild_fkey  FOREIGN KEY (dc_guild_id) REFERENCES guild(dcid) ON DELETE CASCADE
@@ -59,11 +63,20 @@ CREATE TABLE thread (
 CREATE TABLE puppet (
     id TEXT PRIMARY KEY,
 
-    name       TEXT NOT NULL,
-    name_set   BOOLEAN NOT NULL,
-    avatar     TEXT NOT NULL,
-    avatar_url TEXT NOT NULL,
-    avatar_set BOOLEAN NOT NULL,
+    name             TEXT NOT NULL,
+    name_set         BOOLEAN NOT NULL DEFAULT false,
+    avatar           TEXT NOT NULL,
+    avatar_url       TEXT NOT NULL,
+    avatar_set       BOOLEAN NOT NULL DEFAULT false,
+
+    contact_info_set BOOLEAN NOT NULL DEFAULT false,
+
+    global_name    TEXT NOT NULL DEFAULT '',
+    username       TEXT NOT NULL DEFAULT '',
+    discriminator  TEXT NOT NULL DEFAULT '',
+    is_bot         BOOLEAN NOT NULL DEFAULT false,
+    is_webhook     BOOLEAN NOT NULL DEFAULT false,
+    is_application BOOLEAN NOT NULL DEFAULT false,
 
     custom_mxid  TEXT,
     access_token TEXT,
@@ -94,18 +107,19 @@ CREATE TABLE user_portal (
 );
 
 CREATE TABLE message (
-    dcid             TEXT,
-    dc_attachment_id TEXT,
-    dc_edit_index    INTEGER,
-    dc_chan_id       TEXT,
-    dc_chan_receiver TEXT,
-    dc_sender        TEXT   NOT NULL,
-    timestamp        BIGINT NOT NULL,
-    dc_thread_id     TEXT   NOT NULL,
+    dcid              TEXT,
+    dc_attachment_id  TEXT,
+    dc_chan_id        TEXT,
+    dc_chan_receiver  TEXT,
+    dc_sender         TEXT   NOT NULL,
+    timestamp         BIGINT NOT NULL,
+    dc_edit_timestamp BIGINT NOT NULL,
+    dc_thread_id      TEXT   NOT NULL,
 
-    mxid TEXT NOT NULL UNIQUE,
+    mxid        TEXT NOT NULL UNIQUE,
+    sender_mxid TEXT NOT NULL DEFAULT '',
 
-    PRIMARY KEY (dcid, dc_attachment_id, dc_edit_index, dc_chan_id, dc_chan_receiver),
+    PRIMARY KEY (dcid, dc_attachment_id, dc_chan_id, dc_chan_receiver),
     CONSTRAINT message_portal_fkey FOREIGN KEY (dc_chan_id, dc_chan_receiver) REFERENCES portal (dcid, receiver) ON DELETE CASCADE
 );
 
@@ -117,19 +131,12 @@ CREATE TABLE reaction (
     dc_emoji_name    TEXT,
     dc_thread_id     TEXT NOT NULL,
 
-    dc_first_attachment_id TEXT    NOT NULL,
-    _dc_first_edit_index   INTEGER NOT NULL DEFAULT 0,
+    dc_first_attachment_id TEXT NOT NULL,
 
     mxid TEXT NOT NULL UNIQUE,
 
     PRIMARY KEY (dc_chan_id, dc_chan_receiver, dc_msg_id, dc_sender, dc_emoji_name),
-    CONSTRAINT reaction_message_fkey FOREIGN KEY (dc_msg_id, dc_first_attachment_id, _dc_first_edit_index, dc_chan_id, dc_chan_receiver) REFERENCES message (dcid, dc_attachment_id, dc_edit_index, dc_chan_id, dc_chan_receiver) ON DELETE CASCADE
-);
-
-CREATE TABLE emoji (
-    discord_id   TEXT PRIMARY KEY,
-    discord_name TEXT,
-    matrix_url   TEXT
+    CONSTRAINT reaction_message_fkey FOREIGN KEY (dc_msg_id, dc_first_attachment_id, dc_chan_id, dc_chan_receiver) REFERENCES message (dcid, dc_attachment_id, dc_chan_id, dc_chan_receiver) ON DELETE CASCADE
 );
 
 CREATE TABLE role (
@@ -154,18 +161,19 @@ CREATE TABLE role (
 CREATE TABLE discord_file (
     url       TEXT,
     encrypted BOOLEAN,
+    mxc       TEXT NOT NULL,
 
-    id  TEXT,
-    mxc TEXT NOT NULL,
-
-    size      BIGINT NOT NULL,
-    width     INTEGER,
-    height    INTEGER,
-    mime_type TEXT NOT NULL,
+    id         TEXT,
+    emoji_name TEXT,
 
+    size            BIGINT NOT NULL,
+    width           INTEGER,
+    height          INTEGER,
+    mime_type       TEXT NOT NULL,
     decryption_info jsonb,
-
-    timestamp BIGINT NOT NULL,
+    timestamp       BIGINT NOT NULL,
 
     PRIMARY KEY (url, encrypted)
 );
+
+CREATE INDEX discord_file_mxc_idx ON discord_file (mxc);

database/upgrades/13-merge-emoji-and-file.postgres.sql

@@ -0,0 +1,4 @@
+-- v13: Merge tables used for cached custom emojis and attachments
+ALTER TABLE discord_file ADD CONSTRAINT mxc_unique UNIQUE (mxc);
+ALTER TABLE discord_file ADD COLUMN emoji_name TEXT;
+DROP TABLE emoji;

database/upgrades/13-merge-emoji-and-file.sqlite.sql

@@ -0,0 +1,24 @@
+-- v13: Merge tables used for cached custom emojis and attachments
+CREATE TABLE new_discord_file (
+    url       TEXT,
+    encrypted BOOLEAN,
+    mxc       TEXT NOT NULL UNIQUE,
+
+    id         TEXT,
+    emoji_name TEXT,
+
+    size            BIGINT NOT NULL,
+    width           INTEGER,
+    height          INTEGER,
+    mime_type       TEXT NOT NULL,
+    decryption_info jsonb,
+    timestamp       BIGINT NOT NULL,
+
+    PRIMARY KEY (url, encrypted)
+);
+
+INSERT INTO new_discord_file (url, encrypted, id, mxc, size, width, height, mime_type, decryption_info, timestamp)
+SELECT url, encrypted, id, mxc, size, width, height, mime_type, decryption_info, timestamp FROM discord_file;
+
+DROP TABLE discord_file;
+ALTER TABLE new_discord_file RENAME TO discord_file;

database/upgrades/14-guild-bridging-mode.sql

@@ -0,0 +1,7 @@
+-- v14: Add more modes of bridging guilds
+ALTER TABLE guild ADD COLUMN bridging_mode INTEGER NOT NULL DEFAULT 0;
+UPDATE guild SET bridging_mode=2 WHERE mxid<>'';
+UPDATE guild SET bridging_mode=3 WHERE auto_bridge_channels=true;
+ALTER TABLE guild DROP COLUMN auto_bridge_channels;
+-- only: postgres
+ALTER TABLE guild ALTER COLUMN bridging_mode DROP DEFAULT;

database/upgrades/15-portal-relay-webhook.sql

@@ -0,0 +1,3 @@
+-- v15: Store relay webhook URL for portals
+ALTER TABLE portal ADD COLUMN relay_webhook_id TEXT;
+ALTER TABLE portal ADD COLUMN relay_webhook_secret TEXT;

database/upgrades/16-add-contact-info.sql

@@ -0,0 +1,3 @@
+-- v16: Store whether custom contact info has been set for the puppet
+
+ALTER TABLE puppet ADD COLUMN contact_info_set BOOLEAN NOT NULL DEFAULT false;

database/upgrades/17-dm-portal-friend-nick.sql

@@ -0,0 +1,2 @@
+-- v17: Store whether DM portal name is a friend nickname
+ALTER TABLE portal ADD COLUMN friend_nick BOOLEAN NOT NULL DEFAULT false;

database/upgrades/18-extra-ghost-metadata.sql

@@ -0,0 +1,4 @@
+-- v18 (compatible with v15+): Store additional metadata for ghosts
+ALTER TABLE puppet ADD COLUMN username TEXT NOT NULL DEFAULT '';
+ALTER TABLE puppet ADD COLUMN discriminator TEXT NOT NULL DEFAULT '';
+ALTER TABLE puppet ADD COLUMN is_bot BOOLEAN NOT NULL DEFAULT false;

database/upgrades/19-message-edit-ts.postgres.sql

@@ -0,0 +1,15 @@
+-- v19: Replace dc_edit_index with dc_edit_timestamp
+-- transaction: off
+BEGIN;
+
+ALTER TABLE reaction DROP CONSTRAINT reaction_message_fkey;
+ALTER TABLE message DROP CONSTRAINT message_pkey;
+ALTER TABLE message DROP COLUMN dc_edit_index;
+ALTER TABLE reaction DROP COLUMN _dc_first_edit_index;
+ALTER TABLE message ADD PRIMARY KEY (dcid, dc_attachment_id, dc_chan_id, dc_chan_receiver);
+ALTER TABLE reaction ADD CONSTRAINT reaction_message_fkey FOREIGN KEY (dc_msg_id, dc_first_attachment_id, dc_chan_id, dc_chan_receiver) REFERENCES message (dcid, dc_attachment_id, dc_chan_id, dc_chan_receiver) ON DELETE CASCADE;
+
+ALTER TABLE message ADD COLUMN dc_edit_timestamp BIGINT NOT NULL DEFAULT 0;
+ALTER TABLE message ALTER COLUMN dc_edit_timestamp DROP DEFAULT;
+
+COMMIT;

database/upgrades/19-message-edit-ts.sqlite.sql

@@ -0,0 +1,48 @@
+-- v19: Replace dc_edit_index with dc_edit_timestamp
+-- transaction: off
+PRAGMA foreign_keys = OFF;
+BEGIN;
+
+CREATE TABLE message_new (
+    dcid              TEXT,
+    dc_attachment_id  TEXT,
+    dc_chan_id        TEXT,
+    dc_chan_receiver  TEXT,
+    dc_sender         TEXT   NOT NULL,
+    timestamp         BIGINT NOT NULL,
+    dc_edit_timestamp BIGINT NOT NULL,
+    dc_thread_id      TEXT   NOT NULL,
+
+    mxid TEXT NOT NULL UNIQUE,
+
+    PRIMARY KEY (dcid, dc_attachment_id, dc_chan_id, dc_chan_receiver),
+    CONSTRAINT message_portal_fkey FOREIGN KEY (dc_chan_id, dc_chan_receiver) REFERENCES portal (dcid, receiver) ON DELETE CASCADE
+);
+INSERT INTO message_new (dcid, dc_attachment_id, dc_chan_id, dc_chan_receiver, dc_sender, timestamp, dc_edit_timestamp, dc_thread_id, mxid)
+    SELECT dcid, dc_attachment_id, dc_chan_id, dc_chan_receiver, dc_sender, timestamp, 0, dc_thread_id, mxid FROM message;
+DROP TABLE message;
+ALTER TABLE message_new RENAME TO message;
+
+CREATE TABLE reaction_new (
+    dc_chan_id       TEXT,
+    dc_chan_receiver TEXT,
+    dc_msg_id        TEXT,
+    dc_sender        TEXT,
+    dc_emoji_name    TEXT,
+    dc_thread_id     TEXT NOT NULL,
+
+    dc_first_attachment_id TEXT NOT NULL,
+
+    mxid TEXT NOT NULL UNIQUE,
+
+    PRIMARY KEY (dc_chan_id, dc_chan_receiver, dc_msg_id, dc_sender, dc_emoji_name),
+    CONSTRAINT reaction_message_fkey FOREIGN KEY (dc_msg_id, dc_first_attachment_id, dc_chan_id, dc_chan_receiver) REFERENCES message (dcid, dc_attachment_id, dc_chan_id, dc_chan_receiver) ON DELETE CASCADE
+);
+INSERT INTO reaction_new (dc_chan_id, dc_chan_receiver, dc_msg_id, dc_sender, dc_emoji_name, dc_thread_id, dc_first_attachment_id, mxid)
+    SELECT dc_chan_id, dc_chan_receiver, dc_msg_id, dc_sender, dc_emoji_name, COALESCE(dc_thread_id, ''), dc_first_attachment_id, mxid FROM reaction;
+DROP TABLE reaction;
+ALTER TABLE reaction_new RENAME TO reaction;
+
+PRAGMA foreign_key_check;
+COMMIT;
+PRAGMA foreign_keys = ON;

database/upgrades/20-message-sender-mxid.sql

@@ -0,0 +1,2 @@
+-- v20 (compatible with v19+): Store message sender Matrix user ID
+ALTER TABLE message ADD COLUMN sender_mxid TEXT NOT NULL DEFAULT '';

database/upgrades/21-more-puppet-info.sql

@@ -0,0 +1,3 @@
+-- v21 (compatible with v19+): Store global displayname and is webhook status for puppets
+ALTER TABLE puppet ADD COLUMN global_name TEXT NOT NULL DEFAULT '';
+ALTER TABLE puppet ADD COLUMN is_webhook BOOLEAN NOT NULL DEFAULT false;

database/upgrades/22-file-cache-duplicate-mxc.sql

@@ -0,0 +1,26 @@
+-- v22 (compatible with v19+): Allow non-unique mxc URIs in file cache
+CREATE TABLE new_discord_file (
+    url       TEXT,
+    encrypted BOOLEAN,
+    mxc       TEXT NOT NULL,
+
+    id         TEXT,
+    emoji_name TEXT,
+
+    size            BIGINT NOT NULL,
+    width           INTEGER,
+    height          INTEGER,
+    mime_type       TEXT NOT NULL,
+    decryption_info jsonb,
+    timestamp       BIGINT NOT NULL,
+
+    PRIMARY KEY (url, encrypted)
+);
+
+INSERT INTO new_discord_file (url, encrypted, mxc, id, emoji_name, size, width, height, mime_type, decryption_info, timestamp)
+SELECT url, encrypted, mxc, id, emoji_name, size, width, height, mime_type, decryption_info, timestamp FROM discord_file;
+
+DROP TABLE discord_file;
+ALTER TABLE new_discord_file RENAME TO discord_file;
+
+CREATE INDEX discord_file_mxc_idx ON discord_file (mxc);

database/upgrades/23-puppet-is-application.sql

@@ -0,0 +1,2 @@
+-- v23 (compatible with v19+): Store is application status for puppets
+ALTER TABLE puppet ADD COLUMN is_application BOOLEAN NOT NULL DEFAULT false;

database/userportal.go

@@ -29,7 +29,7 @@ func (up UserPortal) Scan(l log.Logger, row dbutil.Scannable) *UserPortal {
 		l.Errorln("Error scanning user portal:", err)
 		panic(err)
 	}
-	up.Timestamp = time.UnixMilli(ts)
+	up.Timestamp = time.UnixMilli(ts).UTC()
 	return &up
 }
 

discord.go

@@ -18,30 +18,35 @@ func (user *User) channelIsBridgeable(channel *discordgo.Channel) bool {
 		return false
 	}
 
+	log := user.log.With().Str("guild_id", channel.GuildID).Str("channel_id", channel.ID).Logger()
+
 	member, err := user.Session.State.Member(channel.GuildID, user.DiscordID)
 	if errors.Is(err, discordgo.ErrStateNotFound) {
-		user.log.Debugfln("Fetching own membership in %s to check own roles", channel.GuildID)
+		log.Debug().Msg("Fetching own membership in guild to check roles")
 		member, err = user.Session.GuildMember(channel.GuildID, user.DiscordID)
 		if err != nil {
-			user.log.Warnfln("Failed to get own membership in %s from server to determine own roles for bridging %s: %v", channel.GuildID, channel.ID, err)
+			log.Warn().Err(err).Msg("Failed to get own membership in guild from server")
 		} else {
 			err = user.Session.State.MemberAdd(member)
 			if err != nil {
-				user.log.Warnfln("Failed to add own membership in %s to cache: %v", channel.GuildID, err)
+				log.Warn().Err(err).Msg("Failed to add own membership in guild to cache")
 			}
 		}
 	} else if err != nil {
-		user.log.Warnfln("Failed to get own membership in %s from cache to determine own roles for bridging %s: %v", channel.GuildID, channel.ID, err)
+		log.Warn().Err(err).Msg("Failed to get own membership in guild from cache")
 	}
 	err = user.Session.State.ChannelAdd(channel)
 	if err != nil {
-		user.log.Warnfln("Failed to add channel %s/%s to cache: %v", channel.GuildID, channel.ID, err)
+		log.Warn().Err(err).Msg("Failed to add channel to cache")
 	}
 	perms, err := user.Session.State.UserChannelPermissions(user.DiscordID, channel.ID)
 	if err != nil {
-		user.log.Warnfln("Failed to get permissions in %s/%s to determine if it's bridgeable: %v", channel.GuildID, channel.ID, err)
+		log.Warn().Err(err).Msg("Failed to get permissions in channel to determine if it's bridgeable")
 		return true
 	}
-	user.log.Debugfln("Computed permissions in %s/%s: %d (view channel: %t)", channel.GuildID, channel.ID, perms, perms&discordgo.PermissionViewChannel > 0)
+	log.Debug().
+		Int64("permissions", perms).
+		Bool("view_channel", perms&discordgo.PermissionViewChannel > 0).
+		Msg("Computed permissions in channel")
 	return perms&discordgo.PermissionViewChannel > 0
 }

emoji.go

@@ -1,79 +0,0 @@
-package main
-
-import (
-	"io/ioutil"
-	"net/http"
-
-	"github.com/bwmarrin/discordgo"
-
-	"maunium.net/go/mautrix/appservice"
-	"maunium.net/go/mautrix/id"
-)
-
-func (portal *Portal) getEmojiMXCByDiscordID(emojiID, name string, animated bool) id.ContentURI {
-	dbEmoji := portal.bridge.DB.Emoji.GetByDiscordID(emojiID)
-
-	if dbEmoji == nil {
-		data, mimeType, err := portal.downloadDiscordEmoji(emojiID, animated)
-		if err != nil {
-			portal.log.Warnfln("Failed to download emoji %s from discord: %v", emojiID, err)
-			return id.ContentURI{}
-		}
-
-		uri, err := portal.uploadMatrixEmoji(portal.MainIntent(), data, mimeType)
-		if err != nil {
-			portal.log.Warnfln("Failed to upload discord emoji %s to homeserver: %v", emojiID, err)
-			return id.ContentURI{}
-		}
-
-		dbEmoji = portal.bridge.DB.Emoji.New()
-		dbEmoji.DiscordID = emojiID
-		dbEmoji.DiscordName = name
-		dbEmoji.MatrixURL = uri
-		dbEmoji.Insert()
-	}
-
-	return dbEmoji.MatrixURL
-}
-
-func (portal *Portal) downloadDiscordEmoji(id string, animated bool) ([]byte, string, error) {
-	var url string
-	var mimeType string
-
-	if animated {
-		// This url requests a gif, so that's what we set the mimetype to.
-		url = discordgo.EndpointEmojiAnimated(id)
-		mimeType = "image/gif"
-	} else {
-		// This url requests a png, so that's what we set the mimetype to.
-		url = discordgo.EndpointEmoji(id)
-		mimeType = "image/png"
-	}
-
-	req, err := http.NewRequest(http.MethodGet, url, nil)
-	if err != nil {
-		return nil, mimeType, err
-	}
-
-	req.Header.Set("User-Agent", discordgo.DroidBrowserUserAgent)
-
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return nil, mimeType, err
-	}
-
-	defer resp.Body.Close()
-
-	data, err := ioutil.ReadAll(resp.Body)
-
-	return data, mimeType, err
-}
-
-func (portal *Portal) uploadMatrixEmoji(intent *appservice.IntentAPI, data []byte, mimeType string) (id.ContentURI, error) {
-	uploaded, err := intent.UploadBytes(data, mimeType)
-	if err != nil {
-		return id.ContentURI{}, err
-	}
-
-	return uploaded.ContentURI, nil
-}

example-config.yaml

@@ -2,6 +2,9 @@
 homeserver:
     # The address that this appservice can use to connect to the homeserver.
     address: https://matrix.example.com
+    # Publicly accessible base URL for media, used for avatars in relay mode.
+    # If not set, the connection address above will be used.
+    public_address: null
     # The domain of the homeserver (also known as server_name, used for MXIDs, etc).
     domain: example.com
 
@@ -17,6 +20,13 @@ homeserver:
     # Does the homeserver support https://github.com/matrix-org/matrix-spec-proposals/pull/2246?
     async_media: false
 
+    # Should the bridge use a websocket for connecting to the homeserver?
+    # The server side is currently not documented anywhere and is only implemented by mautrix-wsproxy,
+    # mautrix-asmux (deprecated), and hungryserv (proprietary).
+    websocket: false
+    # How often should the websocket be pinged? Pinging will be disabled if this is zero.
+    ping_interval_seconds: 0
+
 # Application service host/registration related details.
 # Changing these values requires regeneration of the registration.
 appservice:
@@ -77,11 +87,14 @@ bridge:
     # Displayname template for Discord users. This is also used as the room name in DMs if private_chat_portal_meta is enabled.
     # Available variables:
     #   .ID - Internal user ID
-    #   .Username - User's displayname on Discord
+    #   .Username - Legacy display/username on Discord
+    #   .GlobalName - New displayname on Discord
     #   .Discriminator - The 4 numbers after the name on Discord
     #   .Bot - Whether the user is a bot
     #   .System - Whether the user is an official system user
-    displayname_template: '{{.Username}}#{{.Discriminator}}{{if .Bot}} (bot){{end}}'
+    #   .Webhook - Whether the user is a webhook and is not an application
+    #   .Application - Whether the user is an application
+    displayname_template: '{{or .GlobalName .Username}}{{if .Bot}} (bot){{end}}'
     # Displayname template for Discord channels (bridged as rooms, or spaces when type=4).
     # Available variables:
     #   .Name - Channel name, or user displayname (pre-formatted with displayname_template) in DMs.
@@ -94,9 +107,11 @@ bridge:
     # Available variables:
     #   .Name - Guild name
     guild_name_template: '{{.Name}}'
-    # Should the bridge explicitly set the avatar and room name for DM portal rooms?
-    # This is implicitly enabled in encrypted rooms.
-    private_chat_portal_meta: false
+    # Whether to explicitly set the avatar and room name for private chat portal rooms.
+    # If set to `default`, this will be enabled in encrypted rooms and disabled in unencrypted rooms.
+    # If set to `always`, all DM rooms will have explicit names and avatars set.
+    # If set to `never`, DM rooms will never have names and avatars set.
+    private_chat_portal_meta: default
 
     portal_message_buffer: 128
 
@@ -140,6 +155,47 @@ bridge:
     # Whether or not created rooms should have federation enabled.
     # If false, created portal rooms will never be federated.
     federate_rooms: true
+    # Prefix messages from webhooks with the profile info? This can be used along with a custom displayname_template
+    # to better handle webhooks that change their name all the time (like ones used by bridges).
+    prefix_webhook_messages: false
+    # Bridge webhook avatars?
+    enable_webhook_avatars: true
+    # Should the bridge upload media to the Discord CDN directly before sending the message when using a user token,
+    # like the official client does? The other option is sending the media in the message send request as a form part
+    # (which is always used by bots and webhooks).
+    use_discord_cdn_upload: true
+    # Should mxc uris copied from Discord be cached?
+    # This can be `never` to never cache, `unencrypted` to only cache unencrypted mxc uris, or `always` to cache everything.
+    # If you have a media repo that generates non-unique mxc uris, you should set this to never.
+    cache_media: unencrypted
+    # Patterns for converting Discord media to custom mxc:// URIs instead of reuploading.
+    # Each of the patterns can be set to null to disable custom URIs for that type of media.
+    # More details can be found at https://docs.mau.fi/bridges/go/discord/direct-media.html
+    media_patterns:
+        # Should custom mxc:// URIs be used instead of reuploading media?
+        enabled: false
+        # Pattern for normal message attachments.
+        attachments: mxc://discord-media.mau.dev/attachments|{{.ChannelID}}|{{.AttachmentID}}|{{.FileName}}
+        # Pattern for custom emojis.
+        emojis: mxc://discord-media.mau.dev/emojis|{{.ID}}.{{.Ext}}
+        # Pattern for stickers. Note that animated lottie stickers will not be converted if this is enabled.
+        stickers: mxc://discord-media.mau.dev/stickers|{{.ID}}.{{.Ext}}
+        # Pattern for static user avatars.
+        avatars: mxc://discord-media.mau.dev/avatars|{{.UserID}}|{{.AvatarID}}.{{.Ext}}
+    # Settings for converting animated stickers.
+    animated_sticker:
+        # Format to which animated stickers should be converted.
+        # disable - No conversion, send as-is (lottie JSON)
+        # png - converts to non-animated png (fastest)
+        # gif - converts to animated gif
+        # webm - converts to webm video, requires ffmpeg executable with vp9 codec and webm container support
+        # webp - converts to animated webp, requires ffmpeg executable with webp codec/container support
+        target: webp
+        # Arguments for converter. All converters take width and height.
+        args:
+            width: 320
+            height: 320
+            fps: 25 # only for webm, webp and gif (2, 5, 10, 20 or 25 recommended)
     # Servers to always allow double puppeting from
     double_puppet_server_map:
         example.com: https://example.com
@@ -167,6 +223,30 @@ bridge:
         # Optional extra text sent when joining a management room.
         additional_help: ""
 
+    # Settings for backfilling messages.
+    backfill:
+        # Limits for forward backfilling.
+        forward_limits:
+            # Initial backfill (when creating portal). 0 means backfill is disabled.
+            # A special unlimited value is not supported, you must set a limit. Initial backfill will
+            # fetch all messages first before backfilling anything, so high limits can take a lot of time.
+            initial:
+                dm: 0
+                channel: 0
+                thread: 0
+            # Missed message backfill (on startup).
+            # 0 means backfill is disabled, -1 means fetch all messages since last bridged message.
+            # When using unlimited backfill (-1), messages are backfilled as they are fetched.
+            # With limits, all messages up to the limit are fetched first and backfilled afterwards.
+            missed:
+                dm: 0
+                channel: 0
+                thread: 0
+        # Maximum members in a guild to enable backfilling. Set to -1 to disable limit.
+        # This can be used as a rough heuristic to disable backfilling in channels that are too active.
+        # Currently only applies to missed message backfill.
+        max_guild_members: -1
+
     # End-to-bridge encryption support options.
     #
     # See https://docs.mau.fi/bridges/general/end-to-bridge-encryption.html for more info.
@@ -183,6 +263,29 @@ bridge:
         # Enable key sharing? If enabled, key requests for rooms where users are in will be fulfilled.
         # You must use a client that supports requesting keys from other users to use this feature.
         allow_key_sharing: false
+        # Should users mentions be in the event wire content to enable the server to send push notifications?
+        plaintext_mentions: false
+        # Options for deleting megolm sessions from the bridge.
+        delete_keys:
+            # Beeper-specific: delete outbound sessions when hungryserv confirms
+            # that the user has uploaded the key to key backup.
+            delete_outbound_on_ack: false
+            # Don't store outbound sessions in the inbound table.
+            dont_store_outbound: false
+            # Ratchet megolm sessions forward after decrypting messages.
+            ratchet_on_decrypt: false
+            # Delete fully used keys (index >= max_messages) after decrypting messages.
+            delete_fully_used_on_decrypt: false
+            # Delete previous megolm sessions from same device when receiving a new one.
+            delete_prev_on_new_session: false
+            # Delete megolm sessions received from a device when the device is deleted.
+            delete_on_device_delete: false
+            # Periodically delete megolm sessions when 2x max_age has passed since receiving the session.
+            periodically_delete_expired: false
+            # Delete inbound megolm sessions that don't have the received_at field used for
+            # automatic ratcheting and expired session deletion. This is meant as a migration
+            # to delete old keys prior to the bridge update.
+            delete_outdated_inbound: false
         # What level of device verification should be required from users?
         #
         # Valid levels:
@@ -218,6 +321,10 @@ bridge:
             # default.
             messages: 100
 
+            # Disable rotating keys when a user's devices change?
+            # You should not enable this option unless you understand all the implications.
+            disable_device_change_key_rotation: false
+
     # Settings for provisioning API
     provisioning:
         # Prefix for the provisioning API paths.
@@ -240,12 +347,15 @@ bridge:
         "example.com": user
         "@admin:example.com": admin
 
+# Logging config. See https://github.com/tulir/zeroconfig for details.
 logging:
-  directory: ./logs
-  file_name_format: '{{.Date}}-{{.Index}}.log'
-  file_date_format: "2006-01-02"
-  file_mode: 384
-  timestamp_format: Jan _2, 2006 15:04:05
-  print_level: debug
-  print_json: false
-  file_json: false
+    min_level: debug
+    writers:
+    - type: stdout
+      format: pretty-colored
+    - type: file
+      format: json
+      filename: ./logs/mautrix-discord.log
+      max_size: 100
+      max_backups: 10
+      compress: true

formatter.go

@@ -1,5 +1,5 @@
 // mautrix-discord - A Matrix-Discord puppeting bridge.
-// Copyright (C) 2022 Tulir Asokan
+// Copyright (C) 2023 Tulir Asokan
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU Affero General Public License as published by
@@ -21,8 +21,12 @@ import (
 	"regexp"
 	"strings"
 
+	"github.com/bwmarrin/discordgo"
 	"github.com/yuin/goldmark"
+	"github.com/yuin/goldmark/extension"
 	"github.com/yuin/goldmark/parser"
+	"github.com/yuin/goldmark/util"
+	"golang.org/x/exp/slices"
 
 	"maunium.net/go/mautrix/event"
 	"maunium.net/go/mautrix/format"
@@ -31,47 +35,89 @@ import (
 	"maunium.net/go/mautrix/util/variationselector"
 )
 
-var discordExtensions = goldmark.WithExtensions(mdext.SimpleSpoiler, mdext.DiscordUnderline, &DiscordEveryone{})
+// escapeFixer is a hacky partial fix for the difference in escaping markdown, used with escapeReplacement
+//
+// Discord allows escaping with just one backslash, e.g. \__a__,
+// but standard markdown requires both to be escaped (\_\_a__)
 var escapeFixer = regexp.MustCompile(`\\(__[^_]|\*\*[^*])`)
 
-func (portal *Portal) renderDiscordMarkdownOnlyHTML(text string) string {
-	text = escapeFixer.ReplaceAllStringFunc(text, func(s string) string {
-		return s[:2] + `\` + s[2:]
-	})
+func escapeReplacement(s string) string {
+	return s[:2] + `\` + s[2:]
+}
 
-	mdRenderer := goldmark.New(
-		goldmark.WithParser(mdext.ParserWithoutFeatures(
-			parser.NewListParser(), parser.NewListItemParser(), parser.NewHTMLBlockParser(), parser.NewRawHTMLParser(),
-		)),
-		format.Extensions, format.HTMLOptions, discordExtensions,
-		goldmark.WithExtensions(&DiscordTag{portal}),
-	)
+// indentableParagraphParser is the default paragraph parser with CanAcceptIndentedLine.
+// Used when disabling CodeBlockParser (as disabling it without a replacement will make indented blocks disappear).
+type indentableParagraphParser struct {
+	parser.BlockParser
+}
+
+var defaultIndentableParagraphParser = &indentableParagraphParser{BlockParser: parser.NewParagraphParser()}
+
+func (b *indentableParagraphParser) CanAcceptIndentedLine() bool {
+	return true
+}
+
+var removeFeaturesExceptLinks = []any{
+	parser.NewListParser(), parser.NewListItemParser(), parser.NewHTMLBlockParser(), parser.NewRawHTMLParser(),
+	parser.NewSetextHeadingParser(), parser.NewThematicBreakParser(),
+	parser.NewCodeBlockParser(),
+}
+var removeFeaturesAndLinks = append(removeFeaturesExceptLinks, parser.NewLinkParser())
+var fixIndentedParagraphs = goldmark.WithParserOptions(parser.WithBlockParsers(util.Prioritized(defaultIndentableParagraphParser, 500)))
+var discordExtensions = goldmark.WithExtensions(extension.Strikethrough, mdext.SimpleSpoiler, mdext.DiscordUnderline, ExtDiscordEveryone, ExtDiscordTag)
+
+var discordRenderer = goldmark.New(
+	goldmark.WithParser(mdext.ParserWithoutFeatures(removeFeaturesAndLinks...)),
+	fixIndentedParagraphs, format.HTMLOptions, discordExtensions,
+)
+var discordRendererWithInlineLinks = goldmark.New(
+	goldmark.WithParser(mdext.ParserWithoutFeatures(removeFeaturesExceptLinks...)),
+	fixIndentedParagraphs, format.HTMLOptions, discordExtensions,
+)
+
+func (portal *Portal) renderDiscordMarkdownOnlyHTML(text string, allowInlineLinks bool) string {
+	text = escapeFixer.ReplaceAllStringFunc(text, escapeReplacement)
 
 	var buf strings.Builder
-	err := mdRenderer.Convert([]byte(text), &buf)
+	ctx := parser.NewContext()
+	ctx.Set(parserContextPortal, portal)
+	renderer := discordRenderer
+	if allowInlineLinks {
+		renderer = discordRendererWithInlineLinks
+	}
+	err := renderer.Convert([]byte(text), &buf, parser.WithContext(ctx))
 	if err != nil {
 		panic(fmt.Errorf("markdown parser errored: %w", err))
 	}
 	return format.UnwrapSingleParagraph(buf.String())
 }
 
-const formatterContextUserKey = "fi.mau.discord.user"
 const formatterContextPortalKey = "fi.mau.discord.portal"
+const formatterContextAllowedMentionsKey = "fi.mau.discord.allowed_mentions"
+const formatterContextInputAllowedMentionsKey = "fi.mau.discord.input_allowed_mentions"
 
-func pillConverter(displayname, mxid, eventID string, ctx format.Context) string {
+func appendIfNotContains(arr []string, newItem string) []string {
+	for _, item := range arr {
+		if item == newItem {
+			return arr
+		}
+	}
+	return append(arr, newItem)
+}
+
+func (br *DiscordBridge) pillConverter(displayname, mxid, eventID string, ctx format.Context) string {
 	if len(mxid) == 0 {
 		return displayname
 	}
-	user := ctx.ReturnData[formatterContextUserKey].(*User)
 	if mxid[0] == '#' {
-		alias, err := user.bridge.Bot.ResolveAlias(id.RoomAlias(mxid))
+		alias, err := br.Bot.ResolveAlias(id.RoomAlias(mxid))
 		if err != nil {
 			return displayname
 		}
 		mxid = alias.RoomID.String()
 	}
 	if mxid[0] == '!' {
-		portal := user.bridge.GetPortalByMXID(id.RoomID(mxid))
+		portal := br.GetPortalByMXID(id.RoomID(mxid))
 		if portal != nil {
 			if eventID == "" {
 				//currentPortal := ctx[formatterContextPortalKey].(*Portal)
@@ -82,7 +128,7 @@ func pillConverter(displayname, mxid, eventID string, ctx format.Context) string
 				//} else {
 				//	// TODO is mentioning private channels possible at all?
 				//}
-			} else if msg := user.bridge.DB.Message.GetByMXID(portal.Key, id.EventID(eventID)); msg != nil {
+			} else if msg := br.DB.Message.GetByMXID(portal.Key, id.EventID(eventID)); msg != nil {
 				guildID := portal.GuildID
 				if guildID == "" {
 					guildID = "@me"
@@ -91,12 +137,19 @@ func pillConverter(displayname, mxid, eventID string, ctx format.Context) string
 			}
 		}
 	} else if mxid[0] == '@' {
-		parsedID, ok := user.bridge.ParsePuppetMXID(id.UserID(mxid))
+		allowedMentions, _ := ctx.ReturnData[formatterContextInputAllowedMentionsKey].([]id.UserID)
+		if allowedMentions != nil && !slices.Contains(allowedMentions, id.UserID(mxid)) {
+			return displayname
+		}
+		mentions := ctx.ReturnData[formatterContextAllowedMentionsKey].(*discordgo.MessageAllowedMentions)
+		parsedID, ok := br.ParsePuppetMXID(id.UserID(mxid))
 		if ok {
+			mentions.Users = appendIfNotContains(mentions.Users, parsedID)
 			return fmt.Sprintf("<@%s>", parsedID)
 		}
-		mentionedUser := user.bridge.GetUserByMXID(id.UserID(mxid))
+		mentionedUser := br.GetUserByMXID(id.UserID(mxid))
 		if mentionedUser != nil && mentionedUser.DiscordID != "" {
+			mentions.Users = appendIfNotContains(mentions.Users, mentionedUser.DiscordID)
 			return fmt.Sprintf("<@%s>", mentionedUser.DiscordID)
 		}
 	}
@@ -117,6 +170,7 @@ var discordMarkdownEscaper = strings.NewReplacer(
 	"`", "\\`",
 	`|`, `\|`,
 	`<`, `\<`,
+	`#`, `\#`,
 )
 
 func escapeDiscordMarkdown(s string) string {
@@ -162,17 +216,21 @@ var matrixHTMLParser = &format.HTMLParser{
 	},
 }
 
-func init() {
-	matrixHTMLParser.PillConverter = pillConverter
-}
-
-func (portal *Portal) parseMatrixHTML(user *User, content *event.MessageEventContent) string {
+func (portal *Portal) parseMatrixHTML(content *event.MessageEventContent) (string, *discordgo.MessageAllowedMentions) {
+	allowedMentions := &discordgo.MessageAllowedMentions{
+		Parse:       []discordgo.AllowedMentionType{},
+		Users:       []string{},
+		RepliedUser: true,
+	}
 	if content.Format == event.FormatHTML && len(content.FormattedBody) > 0 {
 		ctx := format.NewContext()
-		ctx.ReturnData[formatterContextUserKey] = user
 		ctx.ReturnData[formatterContextPortalKey] = portal
-		return variationselector.Remove(matrixHTMLParser.Parse(content.FormattedBody, ctx))
+		ctx.ReturnData[formatterContextAllowedMentionsKey] = allowedMentions
+		if content.Mentions != nil {
+			ctx.ReturnData[formatterContextInputAllowedMentionsKey] = content.Mentions.UserIDs
+		}
+		return variationselector.FullyQualify(matrixHTMLParser.Parse(content.FormattedBody, ctx)), allowedMentions
 	} else {
-		return variationselector.Remove(escapeDiscordMarkdown(content.Body))
+		return variationselector.FullyQualify(escapeDiscordMarkdown(content.Body)), allowedMentions
 	}
 }

formatter_everyone.go

@@ -96,9 +96,11 @@ func (r *discordEveryoneHTMLRenderer) renderDiscordEveryone(w util.BufWriter, so
 	return
 }
 
-type DiscordEveryone struct{}
+type discordEveryone struct{}
 
-func (e *DiscordEveryone) Extend(m goldmark.Markdown) {
+var ExtDiscordEveryone = &discordEveryone{}
+
+func (e *discordEveryone) Extend(m goldmark.Markdown) {
 	m.Parser().AddOptions(parser.WithInlineParsers(
 		util.Prioritized(defaultDiscordEveryoneParser, 600),
 	))

formatter_tag.go

@@ -30,14 +30,14 @@ import (
 	"github.com/yuin/goldmark/renderer"
 	"github.com/yuin/goldmark/text"
 	"github.com/yuin/goldmark/util"
-	"maunium.net/go/mautrix"
 
 	"go.mau.fi/mautrix-discord/database"
 )
 
 type astDiscordTag struct {
 	ast.BaseInline
-	id int64
+	portal *Portal
+	id     int64
 }
 
 var _ ast.Node = (*astDiscordTag)(nil)
@@ -143,7 +143,10 @@ func (s *discordTagParser) Trigger() []byte {
 	return []byte{'<'}
 }
 
+var parserContextPortal = parser.NewContextKey()
+
 func (s *discordTagParser) Parse(parent ast.Node, block text.Reader, pc parser.Context) ast.Node {
+	portal := pc.Get(parserContextPortal).(*Portal)
 	//before := block.PrecendingCharacter()
 	line, _ := block.PeekLine()
 	match := discordTagRegex.FindSubmatch(line)
@@ -157,7 +160,7 @@ func (s *discordTagParser) Parse(parent ast.Node, block text.Reader, pc parser.C
 	if err != nil {
 		return nil
 	}
-	tag := astDiscordTag{id: id}
+	tag := astDiscordTag{id: id, portal: portal}
 	tagName := string(match[1])
 	switch {
 	case tagName == "@":
@@ -189,7 +192,7 @@ func (s *discordTagParser) Parse(parent ast.Node, block text.Reader, pc parser.C
 	case strings.HasPrefix(tagName, ":"):
 		return &astDiscordCustomEmoji{name: tagName, astDiscordTag: tag}
 	case strings.HasPrefix(tagName, "a:"):
-		return &astDiscordCustomEmoji{name: tagName[1:], astDiscordTag: tag}
+		return &astDiscordCustomEmoji{name: tagName[1:], astDiscordTag: tag, animated: true}
 	default:
 		return nil
 	}
@@ -199,9 +202,9 @@ func (s *discordTagParser) CloseBlock(parent ast.Node, pc parser.Context) {
 	// nothing to do
 }
 
-type discordTagHTMLRenderer struct {
-	portal *Portal
-}
+type discordTagHTMLRenderer struct{}
+
+var defaultDiscordTagHTMLRenderer = &discordTagHTMLRenderer{}
 
 func (r *discordTagHTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
 	reg.Register(astKindDiscordTag, r.renderDiscordMention)
@@ -259,32 +262,39 @@ func (r *discordTagHTMLRenderer) renderDiscordMention(w util.BufWriter, source [
 	}
 	switch node := n.(type) {
 	case *astDiscordUserMention:
-		puppet := r.portal.bridge.GetPuppetByID(strconv.FormatInt(node.id, 10))
-		_, _ = fmt.Fprintf(w, `<a href="https://matrix.to/#/%s">%s</a>`, puppet.MXID, puppet.Name)
+		if user := node.portal.bridge.GetUserByID(strconv.FormatInt(node.id, 10)); user != nil {
+			_, _ = fmt.Fprintf(w, `<a href="%s">%s</a>`, user.MXID.URI().MatrixToURL(), user.MXID)
+		} else if puppet := node.portal.bridge.GetPuppetByID(strconv.FormatInt(node.id, 10)); puppet != nil {
+			_, _ = fmt.Fprintf(w, `<a href="%s">%s</a>`, puppet.MXID.URI().MatrixToURL(), puppet.Name)
+		}
 		return
 	case *astDiscordRoleMention:
-		role := r.portal.bridge.DB.Role.GetByID(r.portal.GuildID, strconv.FormatInt(node.id, 10))
+		role := node.portal.bridge.DB.Role.GetByID(node.portal.GuildID, strconv.FormatInt(node.id, 10))
 		if role != nil {
 			_, _ = fmt.Fprintf(w, `<font color="#%06x"><strong>@%s</strong></font>`, role.Color, role.Name)
 			return
 		}
 	case *astDiscordChannelMention:
-		portal := r.portal.bridge.GetExistingPortalByID(database.PortalKey{
+		portal := node.portal.bridge.GetExistingPortalByID(database.PortalKey{
 			ChannelID: strconv.FormatInt(node.id, 10),
 			Receiver:  "",
 		})
 		if portal != nil {
 			if portal.MXID != "" {
-				_, _ = fmt.Fprintf(w, `<a href="https://matrix.to/#/%s?via=%s">%s</a>`, portal.MXID, portal.bridge.AS.HomeserverDomain, portal.Name)
+				_, _ = fmt.Fprintf(w, `<a href="%s">%s</a>`, portal.MXID.URI(portal.bridge.AS.HomeserverDomain).MatrixToURL(), portal.Name)
 			} else {
 				_, _ = w.WriteString(portal.Name)
 			}
 			return
 		}
 	case *astDiscordCustomEmoji:
-		reactionMXC := r.portal.getEmojiMXCByDiscordID(strconv.FormatInt(node.id, 10), node.name, node.animated)
+		reactionMXC := node.portal.getEmojiMXCByDiscordID(strconv.FormatInt(node.id, 10), node.name, node.animated)
 		if !reactionMXC.IsEmpty() {
-			_, _ = fmt.Fprintf(w, `<img data-mx-emoticon src="%[1]s" alt="%[2]s" title="%[2]s" height="32"/>`, reactionMXC.String(), node.name)
+			attrs := "data-mx-emoticon"
+			if node.animated {
+				attrs += " data-mau-animated-emoji"
+			}
+			_, _ = fmt.Fprintf(w, `<img %[3]s src="%[1]s" alt="%[2]s" title="%[2]s" height="32"/>`, reactionMXC.String(), node.name, attrs)
 			return
 		}
 	case *astDiscordTimestamp:
@@ -299,9 +309,9 @@ func (r *discordTagHTMLRenderer) renderDiscordMention(w util.BufWriter, source [
 		const fullDatetimeFormat = "2006-01-02T15:04:05.000-0700"
 		fullRFC := ts.Format(fullDatetimeFormat)
 		fullHumanReadable := ts.Format(discordTimestampStyle('F').Format())
-		_, _ = fmt.Fprintf(w, `<time title="%s" datetime="%s"><strong>%s</strong></time>`, fullHumanReadable, fullRFC, formatted)
+		_, _ = fmt.Fprintf(w, `<time title="%s" datetime="%s" data-discord-style="%c"><strong>%s</strong></time>`, fullHumanReadable, fullRFC, node.style, formatted)
 	}
-	stringifiable, ok := n.(mautrix.Stringifiable)
+	stringifiable, ok := n.(fmt.Stringer)
 	if ok {
 		_, _ = w.WriteString(stringifiable.String())
 	} else {
@@ -310,15 +320,15 @@ func (r *discordTagHTMLRenderer) renderDiscordMention(w util.BufWriter, source [
 	return
 }
 
-type DiscordTag struct {
-	Portal *Portal
-}
+type discordTag struct{}
 
-func (e *DiscordTag) Extend(m goldmark.Markdown) {
+var ExtDiscordTag = &discordTag{}
+
+func (e *discordTag) Extend(m goldmark.Markdown) {
 	m.Parser().AddOptions(parser.WithInlineParsers(
 		util.Prioritized(defaultDiscordTagParser, 600),
 	))
 	m.Renderer().AddOptions(renderer.WithNodeRenderers(
-		util.Prioritized(&discordTagHTMLRenderer{e.Portal}, 600),
+		util.Prioritized(defaultDiscordTagHTMLRenderer, 600),
 	))
 }

go.mod

@@ -1,37 +1,42 @@
 module go.mau.fi/mautrix-discord
 
-go 1.18
+go 1.19
 
 require (
-	github.com/bwmarrin/discordgo v0.26.1
-	github.com/gabriel-vasile/mimetype v1.4.1
+	github.com/bwmarrin/discordgo v0.27.0
+	github.com/gabriel-vasile/mimetype v1.4.2
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
 	github.com/gorilla/mux v1.8.0
 	github.com/gorilla/websocket v1.5.0
-	github.com/lib/pq v1.10.7
-	github.com/mattn/go-sqlite3 v1.14.16
+	github.com/lib/pq v1.10.9
+	github.com/mattn/go-sqlite3 v1.14.17
+	github.com/rs/zerolog v1.29.1
 	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
-	github.com/stretchr/testify v1.8.1
-	github.com/yuin/goldmark v1.5.3
-	maunium.net/go/maulogger/v2 v2.3.2
-	maunium.net/go/mautrix v0.13.1-0.20230129131014-888cfabd8a52
+	github.com/stretchr/testify v1.8.4
+	github.com/yuin/goldmark v1.5.4
+	golang.org/x/exp v0.0.0-20230713183714-613f0c0eb8a1
+	golang.org/x/sync v0.3.0
+	maunium.net/go/maulogger/v2 v2.4.1
+	maunium.net/go/mautrix v0.15.4
 )
 
 require (
+	github.com/coreos/go-systemd/v22 v22.5.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/mattn/go-colorable v0.1.12 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/rs/zerolog v1.28.0 // indirect
 	github.com/tidwall/gjson v1.14.4 // indirect
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.0 // indirect
 	github.com/tidwall/sjson v1.2.5 // indirect
-	golang.org/x/crypto v0.5.0 // indirect
-	golang.org/x/net v0.5.0 // indirect
-	golang.org/x/sys v0.4.0 // indirect
+	go.mau.fi/zeroconfig v0.1.2 // indirect
+	golang.org/x/crypto v0.11.0 // indirect
+	golang.org/x/net v0.12.0 // indirect
+	golang.org/x/sys v0.10.0 // indirect
+	gopkg.in/natefinch/lumberjack.v2 v2.2.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	maunium.net/go/mauflag v1.0.0 // indirect
 )
 
-replace github.com/bwmarrin/discordgo => github.com/beeper/discordgo v0.0.0-20230129125832-37978ff8e399
+replace github.com/bwmarrin/discordgo => github.com/beeper/discordgo v0.0.0-20230620222529-2cb9d9280e37

go.sum

@@ -1,43 +1,37 @@
 github.com/DATA-DOG/go-sqlmock v1.5.0 h1:Shsta01QNfFxHCfpW6YH2STWB0MudeXXEWMr20OEh60=
-github.com/beeper/discordgo v0.0.0-20230129125832-37978ff8e399 h1:3GZhhiyeXo/r40NmaQddBpCfosSSIrSrqZBLXJWrtYc=
-github.com/beeper/discordgo v0.0.0-20230129125832-37978ff8e399/go.mod h1:NJZpH+1AfhIcyQsPeuBKsUtYrRnjkyu0kIVMCHkZtRY=
-github.com/coreos/go-systemd/v22 v22.3.3-0.20220203105225-a9a7ef127534/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/beeper/discordgo v0.0.0-20230620222529-2cb9d9280e37 h1:N0c/439VcoHGc+gL1lb3vUjr6vUbXz+vor7SLnBOhJU=
+github.com/beeper/discordgo v0.0.0-20230620222529-2cb9d9280e37/go.mod h1:59+AOzzjmL6onAh62nuLXmn7dJCaC/owDLWbGtjTcFA=
+github.com/coreos/go-systemd/v22 v22.5.0 h1:RrqgGjYQKalulkV8NGVIfkXQf6YYmOyiJKk8iXXhfZs=
+github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/gabriel-vasile/mimetype v1.4.1 h1:TRWk7se+TOjCYgRth7+1/OYLNiRNIotknkFtf/dnN7Q=
-github.com/gabriel-vasile/mimetype v1.4.1/go.mod h1:05Vi0w3Y9c/lNvJOdmIwvrrAhX3rYhfQQCaf9VJcv7M=
+github.com/gabriel-vasile/mimetype v1.4.2 h1:w5qFW6JKBz9Y393Y4q372O9A7cUSequkh1Q7OhCmWKU=
+github.com/gabriel-vasile/mimetype v1.4.2/go.mod h1:zApsH/mKG4w07erKIaJPFiX0Tsq9BFQgN3qGY5GnNgA=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 h1:El6M4kTTCOh6aBiKaUGG7oYTSPP8MxqL4YI3kZKwcP4=
 github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510/go.mod h1:pupxD2MaaD3pAXIBCelhxNneeOaAeabZDe5s4K6zSpQ=
 github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
 github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
-github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
 github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
-github.com/lib/pq v1.10.7 h1:p7ZhMD+KsSRozJr34udlUrhboJwWAgCg34+/ZZNvZZw=
-github.com/lib/pq v1.10.7/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
+github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
+github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/mattn/go-colorable v0.1.12 h1:jF+Du6AlPIjs2BiUiQlKOX0rt3SujHxPnksPKZbaA40=
 github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
 github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
 github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
-github.com/mattn/go-sqlite3 v1.14.16 h1:yOQRA0RpS5PFz/oikGwBEqvAWhWg5ufRz4ETLjwpU1Y=
-github.com/mattn/go-sqlite3 v1.14.16/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
+github.com/mattn/go-sqlite3 v1.14.17 h1:mCRHCLDUBXgpKAqIKsaAaAsrAlbkeomtRFKXh2L6YIM=
+github.com/mattn/go-sqlite3 v1.14.17/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rs/xid v1.4.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
-github.com/rs/zerolog v1.28.0 h1:MirSo27VyNi7RJYP3078AA1+Cyzd2GB66qy3aUHvsWY=
-github.com/rs/zerolog v1.28.0/go.mod h1:NILgTygv/Uej1ra5XxGf82ZFSLk58MFGAUS2o6usyD0=
+github.com/rs/zerolog v1.29.1 h1:cO+d60CHkknCbvzEWxP0S9K6KqyTjrCNUy1LdQLCGPc=
+github.com/rs/zerolog v1.29.1/go.mod h1:Le6ESbR7hc+DP6Lt1THiV8CQSdkkNrd3R0XbEgp3ZBU=
 github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e h1:MRM5ITcdelLK2j1vwZ3Je0FKVCfqOLp5zO6trqMLYs0=
 github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e/go.mod h1:XV66xRDqSt+GTGFMVlhk3ULuV0y9ZmzeVGR4mloJI3M=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
-github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
-github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
-github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
-github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/tidwall/gjson v1.14.2/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
 github.com/tidwall/gjson v1.14.4 h1:uo0p8EbA09J7RQaflQ1aBRffTR7xedD2bcIVSYxLnkM=
 github.com/tidwall/gjson v1.14.4/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
@@ -47,35 +41,31 @@ github.com/tidwall/pretty v1.2.0 h1:RWIZEg2iJ8/g6fDDYzMpobmaoGh5OLl4AXtGUGPcqCs=
 github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
 github.com/tidwall/sjson v1.2.5 h1:kLy8mja+1c9jlljvWTlSazM7cKDRfJuR/bOJhcY5NcY=
 github.com/tidwall/sjson v1.2.5/go.mod h1:Fvgq9kS/6ociJEDnK0Fk1cpYF4FIW6ZF7LAe+6jwd28=
-github.com/yuin/goldmark v1.5.3 h1:3HUJmBFbQW9fhQOzMgseU134xfi6hU+mjWywx5Ty+/M=
-github.com/yuin/goldmark v1.5.3/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
-golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
-golang.org/x/crypto v0.5.0 h1:U/0M97KRkSFvyD/3FSmdP5W5swImpNgle/EHFhOsQPE=
-golang.org/x/crypto v0.5.0/go.mod h1:NK/OQwhpMQP3MwtdjgLlYHnH9ebylxKWv3e0fK+mkQU=
-golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/net v0.0.0-20220624214902-1bab6f366d9e/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
-golang.org/x/net v0.5.0 h1:GyT4nK/YDHSqa1c4753ouYCDajOYKTja9Xb/OHtgvSw=
-golang.org/x/net v0.5.0/go.mod h1:DivGGAXEgPSlEBzxGzZI+ZLohi+xUj054jfeKui00ws=
-golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+github.com/yuin/goldmark v1.5.4 h1:2uY/xC0roWy8IBEGLgB1ywIoEJFGmRrX21YQcvGZzjU=
+github.com/yuin/goldmark v1.5.4/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+go.mau.fi/zeroconfig v0.1.2 h1:DKOydWnhPMn65GbXZOafgkPm11BvFashZWLct0dGFto=
+go.mau.fi/zeroconfig v0.1.2/go.mod h1:NcSJkf180JT+1IId76PcMuLTNa1CzsFFZ0nBygIQM70=
+golang.org/x/crypto v0.11.0 h1:6Ewdq3tDic1mg5xRO4milcWCfMVQhI4NkqWWvqejpuA=
+golang.org/x/crypto v0.11.0/go.mod h1:xgJhtzW8F9jGdVFWZESrid1U1bjeNy4zgy5cRr/CIio=
+golang.org/x/exp v0.0.0-20230713183714-613f0c0eb8a1 h1:MGwJjxBy0HJshjDNfLsYO8xppfqWlA5ZT9OhtUUhTNw=
+golang.org/x/exp v0.0.0-20230713183714-613f0c0eb8a1/go.mod h1:FXUEEKJgO7OQYeo8N01OfiKP8RXMtf6e8aTskBGqWdc=
+golang.org/x/net v0.12.0 h1:cfawfvKITfUsFCeJIHJrbSxpeu/E81khclypR0GVT50=
+golang.org/x/net v0.12.0/go.mod h1:zEVYFnQC7m/vmpQFELhcD1EWkZlX69l4oqgmer6hfKA=
+golang.org/x/sync v0.3.0 h1:ftCYgMx6zT/asHUrPw8BLLscYtGznsLAnjq5RH9P66E=
+golang.org/x/sync v0.3.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
 golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.4.0 h1:Zr2JFtRQNX3BCZ8YtxRE9hNJYC8J6I1MVbMg6owUp18=
-golang.org/x/sys v0.4.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
-golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/sys v0.10.0 h1:SqMFp9UcQJZa+pmYuAKjd9xq1f0j5rLcDIk0mj4qAsA=
+golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/natefinch/lumberjack.v2 v2.2.1 h1:bBRl1b0OH9s/DuPhuXpNl+VtCaJXFZ5/uEFST95x9zc=
+gopkg.in/natefinch/lumberjack.v2 v2.2.1/go.mod h1:YD8tP3GAjkrDg1eZH7EGmyESg/lsYskCTPBJVb9jqSc=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 maunium.net/go/mauflag v1.0.0 h1:YiaRc0tEI3toYtJMRIfjP+jklH45uDHtT80nUamyD4M=
 maunium.net/go/mauflag v1.0.0/go.mod h1:nLivPOpTpHnpzEh8jEdSL9UqO9+/KBJFmNRlwKfkPeA=
-maunium.net/go/maulogger/v2 v2.3.2 h1:1XmIYmMd3PoQfp9J+PaHhpt80zpfmMqaShzUTC7FwY0=
-maunium.net/go/maulogger/v2 v2.3.2/go.mod h1:TYWy7wKwz/tIXTpsx8G3mZseIRiC5DoMxSZazOHy68A=
-maunium.net/go/mautrix v0.13.1-0.20230129131014-888cfabd8a52 h1:7KoJL/7eozYlu4GW2jADHO+Qhm8WL45Afcm7A45BivM=
-maunium.net/go/mautrix v0.13.1-0.20230129131014-888cfabd8a52/go.mod h1:gYMQPsZ9lQpyKlVp+DGwOuc9LIcE/c8GZW2CvKHISgM=
+maunium.net/go/maulogger/v2 v2.4.1 h1:N7zSdd0mZkB2m2JtFUsiGTQQAdP0YeFWT7YMc80yAL8=
+maunium.net/go/maulogger/v2 v2.4.1/go.mod h1:omPuYwYBILeVQobz8uO3XC8DIRuEb5rXYlQSuqrbCho=
+maunium.net/go/mautrix v0.15.4 h1:Ug3n2Mo+9Yb94AjZTWJQSNHmShaksEzZi85EPl3S3P0=
+maunium.net/go/mautrix v0.15.4/go.mod h1:dBaDmsnOOBM4a+gKcgefXH73pHGXm+MCJzCs1dXFgrw=

guildportal.go

@@ -22,6 +22,7 @@ import (
 	"sync"
 
 	log "maunium.net/go/maulogger/v2"
+	"maunium.net/go/maulogger/v2/maulogadapt"
 
 	"maunium.net/go/mautrix"
 	"maunium.net/go/mautrix/event"
@@ -219,13 +220,14 @@ func (guild *Guild) CreateMatrixRoom(user *User, meta *discordgo.Guild) error {
 	guild.bridge.guildsLock.Unlock()
 	guild.log.Infoln("Matrix room created:", guild.MXID)
 
-	user.ensureInvited(nil, guild.MXID, false)
+	user.ensureInvited(nil, guild.MXID, false, true)
 
 	return nil
 }
 
 func (guild *Guild) UpdateInfo(source *User, meta *discordgo.Guild) *discordgo.Guild {
 	if meta.Unavailable {
+		guild.log.Debugfln("Ignoring unavailable guild update")
 		return meta
 	}
 	changed := false
@@ -235,6 +237,7 @@ func (guild *Guild) UpdateInfo(source *User, meta *discordgo.Guild) *discordgo.G
 		guild.UpdateBridgeInfo()
 		guild.Update()
 	}
+	source.ensureInvited(nil, guild.MXID, false, false)
 	return meta
 }
 
@@ -269,12 +272,15 @@ func (guild *Guild) UpdateAvatar(iconID string) bool {
 	guild.Avatar = iconID
 	guild.AvatarURL = id.ContentURI{}
 	if guild.Avatar != "" {
-		var err error
-		guild.AvatarURL, err = uploadAvatar(guild.bridge.Bot, discordgo.EndpointGuildIcon(guild.ID, iconID))
+		// TODO direct media support
+		copied, err := guild.bridge.copyAttachmentToMatrix(guild.bridge.Bot, discordgo.EndpointGuildIcon(guild.ID, iconID), false, AttachmentMeta{
+			AttachmentID: fmt.Sprintf("guild_avatar/%s/%s", guild.ID, iconID),
+		})
 		if err != nil {
-			guild.log.Warnfln("Failed to reupload guild avatar %s: %v", guild.Avatar, err)
+			guild.log.Warnfln("Failed to reupload guild avatar %s: %v", iconID, err)
 			return true
 		}
+		guild.AvatarURL = copied.MXC
 	}
 	if guild.MXID != "" {
 		_, err := guild.bridge.Bot.SetRoomAvatar(guild.MXID, guild.AvatarURL)
@@ -292,14 +298,14 @@ func (guild *Guild) cleanup() {
 		return
 	}
 	intent := guild.bridge.Bot
-	if guild.bridge.SpecVersions.UnstableFeatures["com.beeper.room_yeeting"] {
+	if guild.bridge.SpecVersions.Supports(mautrix.BeeperFeatureRoomYeeting) {
 		err := intent.BeeperDeleteRoom(guild.MXID)
-		if err == nil || errors.Is(err, mautrix.MNotFound) {
-			return
+		if err != nil && !errors.Is(err, mautrix.MNotFound) {
+			guild.log.Errorfln("Failed to delete %s using hungryserv yeet endpoint: %v", guild.MXID, err)
 		}
-		guild.log.Warnfln("Failed to delete %s using hungryserv yeet endpoint, falling back to normal behavior: %v", guild.MXID, err)
+		return
 	}
-	guild.bridge.cleanupRoom(intent, guild.MXID, false, guild.log)
+	guild.bridge.cleanupRoom(intent, guild.MXID, false, *maulogadapt.MauAsZero(guild.log))
 }
 
 func (guild *Guild) RemoveMXID() {
@@ -312,6 +318,17 @@ func (guild *Guild) RemoveMXID() {
 	guild.MXID = ""
 	guild.AvatarSet = false
 	guild.NameSet = false
-	guild.AutoBridgeChannels = false
+	guild.BridgingMode = database.GuildBridgeNothing
 	guild.Update()
 }
+
+func (guild *Guild) Delete() {
+	guild.Guild.Delete()
+	guild.bridge.guildsLock.Lock()
+	delete(guild.bridge.guildsByID, guild.ID)
+	if guild.MXID != "" {
+		delete(guild.bridge.guildsByMXID, guild.MXID)
+	}
+	guild.bridge.guildsLock.Unlock()
+
+}

main.go

@@ -20,9 +20,11 @@ import (
 	_ "embed"
 	"sync"
 
+	"golang.org/x/sync/semaphore"
 	"maunium.net/go/mautrix/bridge"
 	"maunium.net/go/mautrix/bridge/commands"
 	"maunium.net/go/mautrix/id"
+	"maunium.net/go/mautrix/util"
 	"maunium.net/go/mautrix/util/configupgrade"
 
 	"go.mau.fi/mautrix-discord/config"
@@ -71,6 +73,9 @@ type DiscordBridge struct {
 	puppets             map[string]*Puppet
 	puppetsByCustomMXID map[id.UserID]*Puppet
 	puppetsLock         sync.Mutex
+
+	attachmentTransfers         *util.SyncMap[attachmentKey, *util.ReturnableOnce[*database.File]]
+	parallelAttachmentSemaphore *semaphore.Weighted
 }
 
 func (br *DiscordBridge) GetExampleConfig() string {
@@ -89,14 +94,17 @@ func (br *DiscordBridge) Init() {
 	br.CommandProcessor = commands.NewProcessor(&br.Bridge)
 	br.RegisterCommands()
 
+	matrixHTMLParser.PillConverter = br.pillConverter
+
 	br.DB = database.New(br.Bridge.DB, br.Log.Sub("Database"))
-	discordLog = br.Log.Sub("Discord")
+	discordLog = br.ZLog.With().Str("component", "discordgo").Logger()
 }
 
 func (br *DiscordBridge) Start() {
 	if br.Config.Bridge.Provisioning.SharedSecret != "disable" {
 		br.provisioning = newProvisioningAPI(br)
 	}
+	br.WaitWebsocketConnected()
 	go br.startUsers()
 }
 
@@ -163,13 +171,18 @@ func main() {
 
 		puppets:             make(map[string]*Puppet),
 		puppetsByCustomMXID: make(map[id.UserID]*Puppet),
+
+		attachmentTransfers:         util.NewSyncMap[attachmentKey, *util.ReturnableOnce[*database.File]](),
+		parallelAttachmentSemaphore: semaphore.NewWeighted(3),
 	}
 	br.Bridge = bridge.Bridge{
-		Name:         "mautrix-discord",
-		URL:          "https://github.com/mautrix/discord",
-		Description:  "A Matrix-Discord puppeting bridge.",
-		Version:      "0.1.0",
-		ProtocolName: "Discord",
+		Name:              "mautrix-discord",
+		URL:               "https://github.com/mautrix/discord",
+		Description:       "A Matrix-Discord puppeting bridge.",
+		Version:           "0.6.0",
+		ProtocolName:      "Discord",
+		BeeperServiceName: "discordgo",
+		BeeperNetworkName: "discord",
 
 		CryptoPickleKey: "maunium.net/go/mautrix-whatsapp",
 

portal_convert.go

@@ -0,0 +1,721 @@
+// mautrix-discord - A Matrix-Discord puppeting bridge.
+// Copyright (C) 2023 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"context"
+	"fmt"
+	"html"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/bwmarrin/discordgo"
+	"github.com/rs/zerolog"
+	"golang.org/x/exp/slices"
+	"maunium.net/go/mautrix/id"
+
+	"maunium.net/go/mautrix"
+	"maunium.net/go/mautrix/appservice"
+	"maunium.net/go/mautrix/event"
+	"maunium.net/go/mautrix/format"
+)
+
+type ConvertedMessage struct {
+	AttachmentID string
+
+	Type    event.Type
+	Content *event.MessageEventContent
+	Extra   map[string]any
+}
+
+func (portal *Portal) createMediaFailedMessage(bridgeErr error) *event.MessageEventContent {
+	return &event.MessageEventContent{
+		Body:    fmt.Sprintf("Failed to bridge media: %v", bridgeErr),
+		MsgType: event.MsgNotice,
+	}
+}
+
+const DiscordStickerSize = 160
+
+func (portal *Portal) convertDiscordFile(ctx context.Context, typeName string, intent *appservice.IntentAPI, id, url string, content *event.MessageEventContent) *event.MessageEventContent {
+	meta := AttachmentMeta{AttachmentID: id, MimeType: content.Info.MimeType}
+	if typeName == "sticker" && content.Info.MimeType == "application/json" {
+		meta.Converter = portal.bridge.convertLottie
+	}
+	dbFile, err := portal.bridge.copyAttachmentToMatrix(intent, url, portal.Encrypted, meta)
+	if err != nil {
+		zerolog.Ctx(ctx).Err(err).Msg("Failed to copy attachment to Matrix")
+		return portal.createMediaFailedMessage(err)
+	}
+	if typeName == "sticker" && content.Info.MimeType == "application/json" {
+		content.Info.MimeType = dbFile.MimeType
+	}
+	content.Info.Size = dbFile.Size
+	if content.Info.Width == 0 && content.Info.Height == 0 {
+		content.Info.Width = dbFile.Width
+		content.Info.Height = dbFile.Height
+	}
+	if dbFile.DecryptionInfo != nil {
+		content.File = &event.EncryptedFileInfo{
+			EncryptedFile: *dbFile.DecryptionInfo,
+			URL:           dbFile.MXC.CUString(),
+		}
+	} else {
+		content.URL = dbFile.MXC.CUString()
+	}
+	return content
+}
+
+func (portal *Portal) cleanupConvertedStickerInfo(content *event.MessageEventContent) {
+	if content.Info == nil {
+		return
+	}
+	if content.Info.Width == 0 && content.Info.Height == 0 {
+		content.Info.Width = DiscordStickerSize
+		content.Info.Height = DiscordStickerSize
+	} else if content.Info.Width > DiscordStickerSize || content.Info.Height > DiscordStickerSize {
+		if content.Info.Width > content.Info.Height {
+			content.Info.Height /= content.Info.Width / DiscordStickerSize
+			content.Info.Width = DiscordStickerSize
+		} else if content.Info.Width < content.Info.Height {
+			content.Info.Width /= content.Info.Height / DiscordStickerSize
+			content.Info.Height = DiscordStickerSize
+		} else {
+			content.Info.Width = DiscordStickerSize
+			content.Info.Height = DiscordStickerSize
+		}
+	}
+}
+
+func (portal *Portal) convertDiscordSticker(ctx context.Context, intent *appservice.IntentAPI, sticker *discordgo.Sticker) *ConvertedMessage {
+	var mime, ext string
+	switch sticker.FormatType {
+	case discordgo.StickerFormatTypePNG:
+		mime = "image/png"
+		ext = "png"
+	case discordgo.StickerFormatTypeAPNG:
+		mime = "image/apng"
+		ext = "png"
+	case discordgo.StickerFormatTypeLottie:
+		mime = "application/json"
+		ext = "json"
+	case discordgo.StickerFormatTypeGIF:
+		mime = "image/gif"
+		ext = "gif"
+	default:
+		zerolog.Ctx(ctx).Warn().
+			Int("sticker_format", int(sticker.FormatType)).
+			Str("sticker_id", sticker.ID).
+			Msg("Unknown sticker format")
+	}
+	content := &event.MessageEventContent{
+		Body: sticker.Name, // TODO find description from somewhere?
+		Info: &event.FileInfo{
+			MimeType: mime,
+		},
+	}
+
+	mxc := portal.bridge.Config.Bridge.MediaPatterns.Sticker(sticker.ID, ext)
+	if mxc.IsEmpty() {
+		content = portal.convertDiscordFile(ctx, "sticker", intent, sticker.ID, sticker.URL(), content)
+	} else {
+		content.URL = mxc.CUString()
+	}
+	portal.cleanupConvertedStickerInfo(content)
+	return &ConvertedMessage{
+		AttachmentID: sticker.ID,
+		Type:         event.EventSticker,
+		Content:      content,
+	}
+}
+
+func (portal *Portal) convertDiscordAttachment(ctx context.Context, intent *appservice.IntentAPI, att *discordgo.MessageAttachment) *ConvertedMessage {
+	content := &event.MessageEventContent{
+		Body: att.Filename,
+		Info: &event.FileInfo{
+			Height:   att.Height,
+			MimeType: att.ContentType,
+			Width:    att.Width,
+
+			// This gets overwritten later after the file is uploaded to the homeserver
+			Size: att.Size,
+		},
+	}
+	if att.Description != "" {
+		content.Body = att.Description
+		content.FileName = att.Filename
+	}
+
+	var extra map[string]any
+
+	switch strings.ToLower(strings.Split(att.ContentType, "/")[0]) {
+	case "audio":
+		content.MsgType = event.MsgAudio
+		if att.Waveform != nil {
+			// TODO convert waveform
+			extra = map[string]any{
+				"org.matrix.1767.audio": map[string]any{
+					"duration": int(att.DurationSeconds * 1000),
+				},
+				"org.matrix.msc3245.voice": map[string]any{},
+			}
+		}
+	case "image":
+		content.MsgType = event.MsgImage
+	case "video":
+		content.MsgType = event.MsgVideo
+	default:
+		content.MsgType = event.MsgFile
+	}
+	mxc := portal.bridge.Config.Bridge.MediaPatterns.Attachment(portal.Key.ChannelID, att.ID, att.Filename)
+	if mxc.IsEmpty() {
+		content = portal.convertDiscordFile(ctx, "attachment", intent, att.ID, att.URL, content)
+	} else {
+		content.URL = mxc.CUString()
+	}
+	return &ConvertedMessage{
+		AttachmentID: att.ID,
+		Type:         event.EventMessage,
+		Content:      content,
+		Extra:        extra,
+	}
+}
+
+func (portal *Portal) convertDiscordVideoEmbed(ctx context.Context, intent *appservice.IntentAPI, embed *discordgo.MessageEmbed) *ConvertedMessage {
+	attachmentID := fmt.Sprintf("video_%s", embed.URL)
+	var proxyURL string
+	if embed.Video != nil {
+		proxyURL = embed.Video.ProxyURL
+	} else {
+		proxyURL = embed.Thumbnail.ProxyURL
+	}
+	dbFile, err := portal.bridge.copyAttachmentToMatrix(intent, proxyURL, portal.Encrypted, NoMeta)
+	if err != nil {
+		zerolog.Ctx(ctx).Err(err).Msg("Failed to copy video embed to Matrix")
+		return &ConvertedMessage{
+			AttachmentID: attachmentID,
+			Type:         event.EventMessage,
+			Content:      portal.createMediaFailedMessage(err),
+		}
+	}
+
+	content := &event.MessageEventContent{
+		Body: embed.URL,
+		Info: &event.FileInfo{
+			MimeType: dbFile.MimeType,
+			Size:     dbFile.Size,
+		},
+	}
+	if embed.Video != nil {
+		content.MsgType = event.MsgVideo
+		content.Info.Width = embed.Video.Width
+		content.Info.Height = embed.Video.Height
+	} else {
+		content.MsgType = event.MsgImage
+		content.Info.Width = embed.Thumbnail.Width
+		content.Info.Height = embed.Thumbnail.Height
+	}
+	if content.Info.Width == 0 && content.Info.Height == 0 {
+		content.Info.Width = dbFile.Width
+		content.Info.Height = dbFile.Height
+	}
+	if dbFile.DecryptionInfo != nil {
+		content.File = &event.EncryptedFileInfo{
+			EncryptedFile: *dbFile.DecryptionInfo,
+			URL:           dbFile.MXC.CUString(),
+		}
+	} else {
+		content.URL = dbFile.MXC.CUString()
+	}
+	extra := map[string]any{}
+	if content.MsgType == event.MsgVideo && embed.Type == discordgo.EmbedTypeGifv {
+		extra["info"] = map[string]any{
+			"fi.mau.discord.gifv":  true,
+			"fi.mau.loop":          true,
+			"fi.mau.autoplay":      true,
+			"fi.mau.hide_controls": true,
+			"fi.mau.no_audio":      true,
+		}
+	}
+	return &ConvertedMessage{
+		AttachmentID: attachmentID,
+		Type:         event.EventMessage,
+		Content:      content,
+		Extra:        extra,
+	}
+}
+
+func (portal *Portal) convertDiscordMessage(ctx context.Context, puppet *Puppet, intent *appservice.IntentAPI, msg *discordgo.Message) []*ConvertedMessage {
+	predictedLength := len(msg.Attachments) + len(msg.StickerItems)
+	if msg.Content != "" {
+		predictedLength++
+	}
+	parts := make([]*ConvertedMessage, 0, predictedLength)
+	if textPart := portal.convertDiscordTextMessage(ctx, intent, msg); textPart != nil {
+		parts = append(parts, textPart)
+	}
+	log := zerolog.Ctx(ctx)
+	handledIDs := make(map[string]struct{})
+	for _, att := range msg.Attachments {
+		if _, handled := handledIDs[att.ID]; handled {
+			continue
+		}
+		handledIDs[att.ID] = struct{}{}
+		log := log.With().Str("attachment_id", att.ID).Logger()
+		if part := portal.convertDiscordAttachment(log.WithContext(ctx), intent, att); part != nil {
+			parts = append(parts, part)
+		}
+	}
+	for _, sticker := range msg.StickerItems {
+		if _, handled := handledIDs[sticker.ID]; handled {
+			continue
+		}
+		handledIDs[sticker.ID] = struct{}{}
+		log := log.With().Str("sticker_id", sticker.ID).Logger()
+		if part := portal.convertDiscordSticker(log.WithContext(ctx), intent, sticker); part != nil {
+			parts = append(parts, part)
+		}
+	}
+	for i, embed := range msg.Embeds {
+		// Ignore non-video embeds, they're handled in convertDiscordTextMessage
+		if getEmbedType(msg, embed) != EmbedVideo {
+			continue
+		}
+		// Discord deduplicates embeds by URL. It makes things easier for us too.
+		if _, handled := handledIDs[embed.URL]; handled {
+			continue
+		}
+		handledIDs[embed.URL] = struct{}{}
+		log := log.With().
+			Str("computed_embed_type", "video").
+			Str("embed_type", string(embed.Type)).
+			Int("embed_index", i).
+			Logger()
+		part := portal.convertDiscordVideoEmbed(log.WithContext(ctx), intent, embed)
+		if part != nil {
+			parts = append(parts, part)
+		}
+	}
+	if len(parts) == 0 && msg.Thread != nil {
+		parts = append(parts, &ConvertedMessage{Type: event.EventMessage, Content: &event.MessageEventContent{
+			MsgType: event.MsgText,
+			Body:    fmt.Sprintf("Created a thread: %s", msg.Thread.Name),
+		}})
+	}
+	for _, part := range parts {
+		puppet.addWebhookMeta(part, msg)
+		puppet.addMemberMeta(part, msg)
+	}
+	return parts
+}
+
+func (puppet *Puppet) addMemberMeta(part *ConvertedMessage, msg *discordgo.Message) {
+	if msg.Member == nil {
+		return
+	}
+	if part.Extra == nil {
+		part.Extra = make(map[string]any)
+	}
+	var avatarURL id.ContentURI
+	var discordAvatarURL string
+	if msg.Member.Avatar != "" {
+		var err error
+		avatarURL, discordAvatarURL, err = puppet.bridge.reuploadUserAvatar(puppet.DefaultIntent(), msg.GuildID, msg.Author.ID, msg.Author.Avatar)
+		if err != nil {
+			puppet.log.Warn().Err(err).
+				Str("avatar_id", msg.Author.Avatar).
+				Msg("Failed to reupload guild user avatar")
+		}
+	}
+	part.Extra["fi.mau.discord.guild_member_metadata"] = map[string]any{
+		"nick":       msg.Member.Nick,
+		"avatar_id":  msg.Member.Avatar,
+		"avatar_url": discordAvatarURL,
+		"avatar_mxc": avatarURL.String(),
+	}
+	if msg.Member.Nick != "" || !avatarURL.IsEmpty() {
+		perMessageProfile := map[string]any{
+			"is_multiple_users": false,
+
+			"displayname": msg.Member.Nick,
+			"avatar_url":  avatarURL.String(),
+		}
+		if msg.Member.Nick == "" {
+			perMessageProfile["displayname"] = puppet.Name
+		}
+		if avatarURL.IsEmpty() {
+			perMessageProfile["avatar_url"] = puppet.AvatarURL.String()
+		}
+		part.Extra["com.beeper.per_message_profile"] = perMessageProfile
+	}
+}
+
+func (puppet *Puppet) addWebhookMeta(part *ConvertedMessage, msg *discordgo.Message) {
+	if msg.WebhookID == "" {
+		return
+	}
+	if part.Extra == nil {
+		part.Extra = make(map[string]any)
+	}
+	var avatarURL id.ContentURI
+	if msg.Author.Avatar != "" {
+		var err error
+		avatarURL, _, err = puppet.bridge.reuploadUserAvatar(puppet.DefaultIntent(), "", msg.Author.ID, msg.Author.Avatar)
+		if err != nil {
+			puppet.log.Warn().Err(err).
+				Str("avatar_id", msg.Author.Avatar).
+				Msg("Failed to reupload webhook avatar")
+		}
+	}
+	part.Extra["fi.mau.discord.webhook_metadata"] = map[string]any{
+		"id":         msg.WebhookID,
+		"name":       msg.Author.Username,
+		"avatar_id":  msg.Author.Avatar,
+		"avatar_url": msg.Author.AvatarURL(""),
+		"avatar_mxc": avatarURL.String(),
+	}
+	part.Extra["com.beeper.per_message_profile"] = map[string]any{
+		"is_multiple_users": true,
+
+		"avatar_url":  avatarURL.String(),
+		"displayname": msg.Author.Username,
+	}
+}
+
+const (
+	embedHTMLWrapper         = `<blockquote class="discord-embed">%s</blockquote>`
+	embedHTMLWrapperColor    = `<blockquote class="discord-embed" background-color="#%06X">%s</blockquote>`
+	embedHTMLAuthorWithImage = `<p class="discord-embed-author"><img data-mx-emoticon height="24" src="%s" title="Author icon" alt="">&nbsp;<span>%s</span></p>`
+	embedHTMLAuthorPlain     = `<p class="discord-embed-author"><span>%s</span></p>`
+	embedHTMLAuthorLink      = `<a href="%s">%s</a>`
+	embedHTMLTitleWithLink   = `<p class="discord-embed-title"><a href="%s"><strong>%s</strong></a></p>`
+	embedHTMLTitlePlain      = `<p class="discord-embed-title"><strong>%s</strong></p>`
+	embedHTMLDescription     = `<p class="discord-embed-description">%s</p>`
+	embedHTMLFieldName       = `<th>%s</th>`
+	embedHTMLFieldValue      = `<td>%s</td>`
+	embedHTMLFields          = `<table class="discord-embed-fields"><tr>%s</tr><tr>%s</tr></table>`
+	embedHTMLLinearField     = `<p class="discord-embed-field" x-inline="%s"><strong>%s</strong><br><span>%s</span></p>`
+	embedHTMLImage           = `<p class="discord-embed-image"><img src="%s" alt="" title="Embed image"></p>`
+	embedHTMLFooterWithImage = `<p class="discord-embed-footer"><sub><img data-mx-emoticon height="20" src="%s" title="Footer icon" alt="">&nbsp;<span>%s</span>%s</sub></p>`
+	embedHTMLFooterPlain     = `<p class="discord-embed-footer"><sub><span>%s</span>%s</sub></p>`
+	embedHTMLFooterOnlyDate  = `<p class="discord-embed-footer"><sub>%s</sub></p>`
+	embedHTMLDate            = `<time datetime="%s">%s</time>`
+	embedFooterDateSeparator = ` • `
+)
+
+func (portal *Portal) convertDiscordRichEmbed(ctx context.Context, intent *appservice.IntentAPI, embed *discordgo.MessageEmbed, msgID string, index int) string {
+	log := zerolog.Ctx(ctx)
+	var htmlParts []string
+	if embed.Author != nil {
+		var authorHTML string
+		authorNameHTML := html.EscapeString(embed.Author.Name)
+		if embed.Author.URL != "" {
+			authorNameHTML = fmt.Sprintf(embedHTMLAuthorLink, embed.Author.URL, authorNameHTML)
+		}
+		authorHTML = fmt.Sprintf(embedHTMLAuthorPlain, authorNameHTML)
+		if embed.Author.ProxyIconURL != "" {
+			dbFile, err := portal.bridge.copyAttachmentToMatrix(intent, embed.Author.ProxyIconURL, false, NoMeta)
+			if err != nil {
+				log.Warn().Err(err).Msg("Failed to reupload author icon in embed")
+			} else {
+				authorHTML = fmt.Sprintf(embedHTMLAuthorWithImage, dbFile.MXC, authorNameHTML)
+			}
+		}
+		htmlParts = append(htmlParts, authorHTML)
+	}
+	if embed.Title != "" {
+		var titleHTML string
+		baseTitleHTML := portal.renderDiscordMarkdownOnlyHTML(embed.Title, false)
+		if embed.URL != "" {
+			titleHTML = fmt.Sprintf(embedHTMLTitleWithLink, html.EscapeString(embed.URL), baseTitleHTML)
+		} else {
+			titleHTML = fmt.Sprintf(embedHTMLTitlePlain, baseTitleHTML)
+		}
+		htmlParts = append(htmlParts, titleHTML)
+	}
+	if embed.Description != "" {
+		htmlParts = append(htmlParts, fmt.Sprintf(embedHTMLDescription, portal.renderDiscordMarkdownOnlyHTML(embed.Description, true)))
+	}
+	for i := 0; i < len(embed.Fields); i++ {
+		item := embed.Fields[i]
+		if portal.bridge.Config.Bridge.EmbedFieldsAsTables {
+			splitItems := []*discordgo.MessageEmbedField{item}
+			if item.Inline && len(embed.Fields) > i+1 && embed.Fields[i+1].Inline {
+				splitItems = append(splitItems, embed.Fields[i+1])
+				i++
+				if len(embed.Fields) > i+1 && embed.Fields[i+1].Inline {
+					splitItems = append(splitItems, embed.Fields[i+1])
+					i++
+				}
+			}
+			headerParts := make([]string, len(splitItems))
+			contentParts := make([]string, len(splitItems))
+			for j, splitItem := range splitItems {
+				headerParts[j] = fmt.Sprintf(embedHTMLFieldName, portal.renderDiscordMarkdownOnlyHTML(splitItem.Name, false))
+				contentParts[j] = fmt.Sprintf(embedHTMLFieldValue, portal.renderDiscordMarkdownOnlyHTML(splitItem.Value, true))
+			}
+			htmlParts = append(htmlParts, fmt.Sprintf(embedHTMLFields, strings.Join(headerParts, ""), strings.Join(contentParts, "")))
+		} else {
+			htmlParts = append(htmlParts, fmt.Sprintf(embedHTMLLinearField,
+				strconv.FormatBool(item.Inline),
+				portal.renderDiscordMarkdownOnlyHTML(item.Name, false),
+				portal.renderDiscordMarkdownOnlyHTML(item.Value, true),
+			))
+		}
+	}
+	if embed.Image != nil {
+		dbFile, err := portal.bridge.copyAttachmentToMatrix(intent, embed.Image.ProxyURL, false, NoMeta)
+		if err != nil {
+			log.Warn().Err(err).Msg("Failed to reupload image in embed")
+		} else {
+			htmlParts = append(htmlParts, fmt.Sprintf(embedHTMLImage, dbFile.MXC))
+		}
+	}
+	var embedDateHTML string
+	if embed.Timestamp != "" {
+		formattedTime := embed.Timestamp
+		parsedTS, err := time.Parse(time.RFC3339, embed.Timestamp)
+		if err != nil {
+			log.Warn().Err(err).Msg("Failed to parse timestamp in embed")
+		} else {
+			formattedTime = parsedTS.Format(discordTimestampStyle('F').Format())
+		}
+		embedDateHTML = fmt.Sprintf(embedHTMLDate, embed.Timestamp, formattedTime)
+	}
+	if embed.Footer != nil {
+		var footerHTML string
+		var datePart string
+		if embedDateHTML != "" {
+			datePart = embedFooterDateSeparator + embedDateHTML
+		}
+		footerHTML = fmt.Sprintf(embedHTMLFooterPlain, html.EscapeString(embed.Footer.Text), datePart)
+		if embed.Footer.ProxyIconURL != "" {
+			dbFile, err := portal.bridge.copyAttachmentToMatrix(intent, embed.Footer.ProxyIconURL, false, NoMeta)
+			if err != nil {
+				log.Warn().Err(err).Msg("Failed to reupload footer icon in embed")
+			} else {
+				footerHTML = fmt.Sprintf(embedHTMLFooterWithImage, dbFile.MXC, html.EscapeString(embed.Footer.Text), datePart)
+			}
+		}
+		htmlParts = append(htmlParts, footerHTML)
+	} else if embed.Timestamp != "" {
+		htmlParts = append(htmlParts, fmt.Sprintf(embedHTMLFooterOnlyDate, embedDateHTML))
+	}
+
+	if len(htmlParts) == 0 {
+		return ""
+	}
+
+	compiledHTML := strings.Join(htmlParts, "")
+	if embed.Color != 0 {
+		compiledHTML = fmt.Sprintf(embedHTMLWrapperColor, embed.Color, compiledHTML)
+	} else {
+		compiledHTML = fmt.Sprintf(embedHTMLWrapper, compiledHTML)
+	}
+	return compiledHTML
+}
+
+type BeeperLinkPreview struct {
+	mautrix.RespPreviewURL
+	MatchedURL      string                   `json:"matched_url"`
+	ImageEncryption *event.EncryptedFileInfo `json:"beeper:image:encryption,omitempty"`
+}
+
+func (portal *Portal) convertDiscordLinkEmbedImage(ctx context.Context, intent *appservice.IntentAPI, url string, width, height int, preview *BeeperLinkPreview) {
+	dbFile, err := portal.bridge.copyAttachmentToMatrix(intent, url, portal.Encrypted, NoMeta)
+	if err != nil {
+		zerolog.Ctx(ctx).Warn().Err(err).Msg("Failed to reupload image in URL preview")
+		return
+	}
+	if width != 0 || height != 0 {
+		preview.ImageWidth = width
+		preview.ImageHeight = height
+	} else {
+		preview.ImageWidth = dbFile.Width
+		preview.ImageHeight = dbFile.Height
+	}
+	preview.ImageSize = dbFile.Size
+	preview.ImageType = dbFile.MimeType
+	if dbFile.Encrypted {
+		preview.ImageEncryption = &event.EncryptedFileInfo{
+			EncryptedFile: *dbFile.DecryptionInfo,
+			URL:           dbFile.MXC.CUString(),
+		}
+	} else {
+		preview.ImageURL = dbFile.MXC.CUString()
+	}
+}
+
+func (portal *Portal) convertDiscordLinkEmbedToBeeper(ctx context.Context, intent *appservice.IntentAPI, embed *discordgo.MessageEmbed) *BeeperLinkPreview {
+	var preview BeeperLinkPreview
+	preview.MatchedURL = embed.URL
+	preview.Title = embed.Title
+	preview.Description = embed.Description
+	if embed.Image != nil {
+		portal.convertDiscordLinkEmbedImage(ctx, intent, embed.Image.ProxyURL, embed.Image.Width, embed.Image.Height, &preview)
+	} else if embed.Thumbnail != nil {
+		portal.convertDiscordLinkEmbedImage(ctx, intent, embed.Thumbnail.ProxyURL, embed.Thumbnail.Width, embed.Thumbnail.Height, &preview)
+	}
+	return &preview
+}
+
+const msgInteractionTemplateHTML = `<blockquote>
+<a href="https://matrix.to/#/%s">%s</a> used <font color="#3771bb">/%s</font>
+</blockquote>`
+
+const msgComponentTemplateHTML = `<p>This message contains interactive elements. Use the Discord app to interact with the message.</p>`
+
+type BridgeEmbedType int
+
+const (
+	EmbedUnknown BridgeEmbedType = iota
+	EmbedRich
+	EmbedLinkPreview
+	EmbedVideo
+)
+
+func isActuallyLinkPreview(embed *discordgo.MessageEmbed) bool {
+	// Sending YouTube links creates a video embed, but we want to bridge it as a URL preview,
+	// so this is a hacky way to detect those.
+	return embed.Video != nil && embed.Video.ProxyURL == ""
+}
+
+func getEmbedType(msg *discordgo.Message, embed *discordgo.MessageEmbed) BridgeEmbedType {
+	switch embed.Type {
+	case discordgo.EmbedTypeLink, discordgo.EmbedTypeArticle:
+		return EmbedLinkPreview
+	case discordgo.EmbedTypeVideo:
+		if isActuallyLinkPreview(embed) {
+			return EmbedLinkPreview
+		}
+		return EmbedVideo
+	case discordgo.EmbedTypeGifv:
+		return EmbedVideo
+	case discordgo.EmbedTypeImage:
+		if msg != nil && isPlainGifMessage(msg) {
+			return EmbedVideo
+		} else if embed.Image == nil && embed.Thumbnail != nil {
+			return EmbedLinkPreview
+		}
+		return EmbedRich
+	case discordgo.EmbedTypeRich:
+		return EmbedRich
+	default:
+		return EmbedUnknown
+	}
+}
+
+func isPlainGifMessage(msg *discordgo.Message) bool {
+	return len(msg.Embeds) == 1 && msg.Embeds[0].URL == msg.Content &&
+		((msg.Embeds[0].Type == discordgo.EmbedTypeGifv && msg.Embeds[0].Video != nil) ||
+			(msg.Embeds[0].Type == discordgo.EmbedTypeImage && msg.Embeds[0].Image == nil && msg.Embeds[0].Thumbnail != nil))
+}
+
+func (portal *Portal) convertDiscordMentions(msg *discordgo.Message, syncGhosts bool) *event.Mentions {
+	var matrixMentions event.Mentions
+	for _, mention := range msg.Mentions {
+		puppet := portal.bridge.GetPuppetByID(mention.ID)
+		if syncGhosts {
+			puppet.UpdateInfo(nil, mention, nil)
+		}
+		user := portal.bridge.GetUserByID(mention.ID)
+		if user != nil {
+			matrixMentions.UserIDs = append(matrixMentions.UserIDs, user.MXID)
+		} else {
+			matrixMentions.UserIDs = append(matrixMentions.UserIDs, puppet.MXID)
+		}
+	}
+	slices.Sort(matrixMentions.UserIDs)
+	matrixMentions.UserIDs = slices.Compact(matrixMentions.UserIDs)
+	if msg.MentionEveryone {
+		matrixMentions.Room = true
+	}
+	return &matrixMentions
+}
+
+func (portal *Portal) convertDiscordTextMessage(ctx context.Context, intent *appservice.IntentAPI, msg *discordgo.Message) *ConvertedMessage {
+	log := zerolog.Ctx(ctx)
+	if msg.Type == discordgo.MessageTypeCall {
+		return &ConvertedMessage{Type: event.EventMessage, Content: &event.MessageEventContent{
+			MsgType: event.MsgEmote,
+			Body:    "started a call",
+		}}
+	} else if msg.Type == discordgo.MessageTypeGuildMemberJoin {
+		return &ConvertedMessage{Type: event.EventMessage, Content: &event.MessageEventContent{
+			MsgType: event.MsgEmote,
+			Body:    "joined the server",
+		}}
+	}
+	var htmlParts []string
+	if msg.Interaction != nil {
+		puppet := portal.bridge.GetPuppetByID(msg.Interaction.User.ID)
+		puppet.UpdateInfo(nil, msg.Interaction.User, nil)
+		htmlParts = append(htmlParts, fmt.Sprintf(msgInteractionTemplateHTML, puppet.MXID, puppet.Name, msg.Interaction.Name))
+	}
+	if msg.Content != "" && !isPlainGifMessage(msg) {
+		htmlParts = append(htmlParts, portal.renderDiscordMarkdownOnlyHTML(msg.Content, false))
+	}
+	previews := make([]*BeeperLinkPreview, 0)
+	for i, embed := range msg.Embeds {
+		if i == 0 && msg.MessageReference == nil && isReplyEmbed(embed) {
+			continue
+		}
+		with := log.With().
+			Str("embed_type", string(embed.Type)).
+			Int("embed_index", i)
+		switch getEmbedType(msg, embed) {
+		case EmbedRich:
+			log := with.Str("computed_embed_type", "rich").Logger()
+			htmlParts = append(htmlParts, portal.convertDiscordRichEmbed(log.WithContext(ctx), intent, embed, msg.ID, i))
+		case EmbedLinkPreview:
+			log := with.Str("computed_embed_type", "link preview").Logger()
+			previews = append(previews, portal.convertDiscordLinkEmbedToBeeper(log.WithContext(ctx), intent, embed))
+		case EmbedVideo:
+			// Ignore video embeds, they're handled as separate messages
+		default:
+			log := with.Logger()
+			log.Warn().Msg("Unknown embed type in message")
+		}
+	}
+
+	if len(msg.Components) > 0 {
+		htmlParts = append(htmlParts, msgComponentTemplateHTML)
+	}
+
+	if len(htmlParts) == 0 {
+		return nil
+	}
+
+	fullHTML := strings.Join(htmlParts, "\n")
+	if !msg.MentionEveryone {
+		fullHTML = strings.ReplaceAll(fullHTML, "@room", "@\u2063ro\u2063om")
+	}
+
+	content := format.HTMLToContent(fullHTML)
+	extraContent := map[string]any{
+		"com.beeper.linkpreviews": previews,
+	}
+
+	if msg.WebhookID != "" && msg.ApplicationID == "" && portal.bridge.Config.Bridge.PrefixWebhookMessages {
+		content.EnsureHasHTML()
+		content.Body = fmt.Sprintf("%s: %s", msg.Author.Username, content.Body)
+		content.FormattedBody = fmt.Sprintf("<strong>%s</strong>: %s", html.EscapeString(msg.Author.Username), content.FormattedBody)
+	}
+
+	return &ConvertedMessage{Type: event.EventMessage, Content: &content, Extra: extraContent}
+}

provisioning.go

@@ -18,6 +18,7 @@ import (
 	"maunium.net/go/mautrix/bridge/bridgeconfig"
 	"maunium.net/go/mautrix/id"
 
+	"go.mau.fi/mautrix-discord/database"
 	"go.mau.fi/mautrix-discord/remoteauth"
 )
 
@@ -226,7 +227,7 @@ func (p *ProvisioningAPI) logout(w http.ResponseWriter, r *http.Request) {
 	} else {
 		msg = "User wasn't logged in."
 	}
-	user.Logout()
+	user.Logout(false)
 	jsonResponse(w, http.StatusOK, Response{true, msg})
 }
 
@@ -327,8 +328,6 @@ func (p *ProvisioningAPI) qrLogin(w http.ResponseWriter, r *http.Request) {
 			}
 
 			log.Infofln("Logged in as %s#%s (%s)", discordUser.Username, discordUser.Discriminator, discordUser.UserID)
-			user.DiscordID = discordUser.UserID
-			user.Update()
 
 			if err = user.Login(discordUser.Token); err != nil {
 				log.Errorln("Failed to connect after logging in:", err)
@@ -429,11 +428,12 @@ func (p *ProvisioningAPI) reconnect(w http.ResponseWriter, r *http.Request) {
 }
 
 type guildEntry struct {
-	ID         string        `json:"id"`
-	Name       string        `json:"name"`
-	AvatarURL  id.ContentURI `json:"avatar_url"`
-	MXID       id.RoomID     `json:"mxid"`
-	AutoBridge bool          `json:"auto_bridge_channels"`
+	ID           string        `json:"id"`
+	Name         string        `json:"name"`
+	AvatarURL    id.ContentURI `json:"avatar_url"`
+	MXID         id.RoomID     `json:"mxid"`
+	AutoBridge   bool          `json:"auto_bridge_channels"`
+	BridgingMode string        `json:"bridging_mode"`
 }
 
 type respGuildsList struct {
@@ -451,11 +451,12 @@ func (p *ProvisioningAPI) guildsList(w http.ResponseWriter, r *http.Request) {
 			continue
 		}
 		resp.Guilds = append(resp.Guilds, guildEntry{
-			ID:         guild.ID,
-			Name:       guild.PlainName,
-			AvatarURL:  guild.AvatarURL,
-			MXID:       guild.MXID,
-			AutoBridge: guild.AutoBridgeChannels,
+			ID:           guild.ID,
+			Name:         guild.PlainName,
+			AvatarURL:    guild.AvatarURL,
+			MXID:         guild.MXID,
+			AutoBridge:   guild.BridgingMode == database.GuildBridgeEverything,
+			BridgingMode: guild.BridgingMode.String(),
 		})
 	}
 
@@ -526,7 +527,7 @@ func (p *ProvisioningAPI) guildsUnbridge(w http.ResponseWriter, r *http.Request)
 			Error:   "Guild not found",
 			ErrCode: mautrix.MNotFound.ErrCode,
 		})
-	} else if !guild.AutoBridgeChannels && guild.MXID == "" {
+	} else if guild.BridgingMode == database.GuildBridgeNothing && guild.MXID == "" {
 		jsonResponse(w, http.StatusNotFound, Error{
 			Error:   "That guild is not bridged",
 			ErrCode: ErrCodeGuildNotBridged,

puppet.go

@@ -3,12 +3,13 @@ package main
 import (
 	"fmt"
 	"regexp"
+	"strings"
 	"sync"
 
-	log "maunium.net/go/maulogger/v2"
-
 	"github.com/bwmarrin/discordgo"
+	"github.com/rs/zerolog"
 
+	"maunium.net/go/mautrix"
 	"maunium.net/go/mautrix/appservice"
 	"maunium.net/go/mautrix/bridge"
 	"maunium.net/go/mautrix/id"
@@ -20,7 +21,7 @@ type Puppet struct {
 	*database.Puppet
 
 	bridge *DiscordBridge
-	log    log.Logger
+	log    zerolog.Logger
 
 	MXID id.UserID
 
@@ -43,7 +44,7 @@ func (br *DiscordBridge) NewPuppet(dbPuppet *database.Puppet) *Puppet {
 	return &Puppet{
 		Puppet: dbPuppet,
 		bridge: br,
-		log:    br.Log.Sub(fmt.Sprintf("Puppet/%s", dbPuppet.ID)),
+		log:    br.ZLog.With().Str("discord_user_id", dbPuppet.ID).Logger(),
 
 		MXID: br.FormatPuppetMXID(dbPuppet.ID),
 	}
@@ -194,7 +195,7 @@ func (puppet *Puppet) updatePortalMeta(meta func(portal *Portal)) {
 }
 
 func (puppet *Puppet) UpdateName(info *discordgo.User) bool {
-	newName := puppet.bridge.Config.Bridge.FormatDisplayname(info)
+	newName := puppet.bridge.Config.Bridge.FormatDisplayname(info, puppet.IsWebhook, puppet.IsApplication)
 	if puppet.Name == newName && puppet.NameSet {
 		return false
 	}
@@ -202,10 +203,10 @@ func (puppet *Puppet) UpdateName(info *discordgo.User) bool {
 	puppet.NameSet = false
 	err := puppet.DefaultIntent().SetDisplayName(newName)
 	if err != nil {
-		puppet.log.Warnln("Failed to update displayname:", err)
+		puppet.log.Warn().Err(err).Msg("Failed to update displayname")
 	} else {
 		go puppet.updatePortalMeta(func(portal *Portal) {
-			if portal.UpdateNameDirect(puppet.Name) {
+			if portal.UpdateNameDirect(puppet.Name, false) {
 				portal.Update()
 				portal.UpdateBridgeInfo()
 			}
@@ -215,20 +216,55 @@ func (puppet *Puppet) UpdateName(info *discordgo.User) bool {
 	return true
 }
 
+func (br *DiscordBridge) reuploadUserAvatar(intent *appservice.IntentAPI, guildID, userID, avatarID string) (id.ContentURI, string, error) {
+	var downloadURL, ext string
+	if guildID == "" {
+		downloadURL = discordgo.EndpointUserAvatar(userID, avatarID)
+		ext = "png"
+		if strings.HasPrefix(avatarID, "a_") {
+			downloadURL = discordgo.EndpointUserAvatarAnimated(userID, avatarID)
+			ext = "gif"
+		}
+	} else {
+		downloadURL = discordgo.EndpointGuildMemberAvatar(guildID, userID, avatarID)
+		ext = "png"
+		if strings.HasPrefix(avatarID, "a_") {
+			downloadURL = discordgo.EndpointGuildMemberAvatarAnimated(guildID, userID, avatarID)
+			ext = "gif"
+		}
+	}
+	if guildID == "" {
+		url := br.Config.Bridge.MediaPatterns.Avatar(userID, avatarID, ext)
+		if !url.IsEmpty() {
+			return url, downloadURL, nil
+		}
+	}
+	copied, err := br.copyAttachmentToMatrix(intent, downloadURL, false, AttachmentMeta{
+		AttachmentID: fmt.Sprintf("avatar/%s/%s/%s", guildID, userID, avatarID),
+	})
+	if err != nil {
+		return id.ContentURI{}, downloadURL, err
+	}
+	return copied.MXC, downloadURL, nil
+}
+
 func (puppet *Puppet) UpdateAvatar(info *discordgo.User) bool {
-	if puppet.Avatar == info.Avatar && puppet.AvatarSet {
+	avatarID := info.Avatar
+	if puppet.IsWebhook && !puppet.bridge.Config.Bridge.EnableWebhookAvatars {
+		avatarID = ""
+	}
+	if puppet.Avatar == avatarID && puppet.AvatarSet {
 		return false
 	}
-	avatarChanged := info.Avatar != puppet.Avatar
-	puppet.Avatar = info.Avatar
+	avatarChanged := avatarID != puppet.Avatar
+	puppet.Avatar = avatarID
 	puppet.AvatarSet = false
 	puppet.AvatarURL = id.ContentURI{}
 
-	// TODO should we just use discord's default avatars for users with no avatar?
 	if puppet.Avatar != "" && (puppet.AvatarURL.IsEmpty() || avatarChanged) {
-		url, err := uploadAvatar(puppet.DefaultIntent(), info.AvatarURL(""))
+		url, _, err := puppet.bridge.reuploadUserAvatar(puppet.DefaultIntent(), "", info.ID, puppet.Avatar)
 		if err != nil {
-			puppet.log.Warnfln("Failed to reupload user avatar %s: %v", puppet.Avatar, err)
+			puppet.log.Warn().Err(err).Str("avatar_id", puppet.Avatar).Msg("Failed to reupload user avatar")
 			return true
 		}
 		puppet.AvatarURL = url
@@ -236,7 +272,7 @@ func (puppet *Puppet) UpdateAvatar(info *discordgo.User) bool {
 
 	err := puppet.DefaultIntent().SetAvatarURL(puppet.AvatarURL)
 	if err != nil {
-		puppet.log.Warnln("Failed to update avatar:", err)
+		puppet.log.Warn().Err(err).Msg("Failed to update avatar")
 	} else {
 		go puppet.updatePortalMeta(func(portal *Portal) {
 			if portal.UpdateAvatarFromPuppet(puppet) {
@@ -249,7 +285,7 @@ func (puppet *Puppet) UpdateAvatar(info *discordgo.User) bool {
 	return true
 }
 
-func (puppet *Puppet) UpdateInfo(source *User, info *discordgo.User) {
+func (puppet *Puppet) UpdateInfo(source *User, info *discordgo.User, message *discordgo.Message) {
 	puppet.syncLock.Lock()
 	defer puppet.syncLock.Unlock()
 
@@ -258,23 +294,97 @@ func (puppet *Puppet) UpdateInfo(source *User, info *discordgo.User) {
 			return
 		}
 		var err error
-		puppet.log.Debugfln("Fetching info through %s to update", source.DiscordID)
+		puppet.log.Debug().Str("source_user", source.DiscordID).Msg("Fetching info through user to update puppet")
 		info, err = source.Session.User(puppet.ID)
 		if err != nil {
-			puppet.log.Errorfln("Failed to fetch info through %s: %v", source.DiscordID, err)
+			puppet.log.Error().Err(err).Str("source_user", source.DiscordID).Msg("Failed to fetch info through user")
 			return
 		}
 	}
 
 	err := puppet.DefaultIntent().EnsureRegistered()
 	if err != nil {
-		puppet.log.Errorln("Failed to ensure registered:", err)
+		puppet.log.Error().Err(err).Msg("Failed to ensure registered")
 	}
 
 	changed := false
+	if message != nil {
+		if message.WebhookID != "" && message.ApplicationID == "" && !puppet.IsWebhook {
+			puppet.log.Debug().
+				Str("message_id", message.ID).
+				Str("webhook_id", message.WebhookID).
+				Msg("Found webhook ID in message, marking ghost as a webhook")
+			puppet.IsWebhook = true
+			changed = true
+		}
+		if message.ApplicationID != "" && !puppet.IsApplication {
+			puppet.log.Debug().
+				Str("message_id", message.ID).
+				Str("application_id", message.ApplicationID).
+				Msg("Found application ID in message, marking ghost as an application")
+			puppet.IsApplication = true
+			puppet.IsWebhook = false
+			changed = true
+		}
+	}
+	changed = puppet.UpdateContactInfo(info) || changed
 	changed = puppet.UpdateName(info) || changed
 	changed = puppet.UpdateAvatar(info) || changed
 	if changed {
 		puppet.Update()
 	}
 }
+
+func (puppet *Puppet) UpdateContactInfo(info *discordgo.User) bool {
+	changed := false
+	if puppet.Username != info.Username {
+		puppet.Username = info.Username
+		changed = true
+	}
+	if puppet.GlobalName != info.GlobalName {
+		puppet.GlobalName = info.GlobalName
+		changed = true
+	}
+	if puppet.Discriminator != info.Discriminator {
+		puppet.Discriminator = info.Discriminator
+		changed = true
+	}
+	if puppet.IsBot != info.Bot {
+		puppet.IsBot = info.Bot
+		changed = true
+	}
+	if (changed && !puppet.IsWebhook) || !puppet.ContactInfoSet {
+		puppet.ContactInfoSet = false
+		puppet.ResendContactInfo()
+		return true
+	}
+	return false
+}
+
+func (puppet *Puppet) ResendContactInfo() {
+	if !puppet.bridge.SpecVersions.Supports(mautrix.BeeperFeatureArbitraryProfileMeta) || puppet.ContactInfoSet {
+		return
+	}
+	discordUsername := puppet.Username
+	if puppet.Discriminator != "0" {
+		discordUsername += "#" + puppet.Discriminator
+	}
+	contactInfo := map[string]any{
+		"com.beeper.bridge.identifiers": []string{
+			fmt.Sprintf("discord:%s", discordUsername),
+		},
+		"com.beeper.bridge.remote_id":      puppet.ID,
+		"com.beeper.bridge.service":        puppet.bridge.BeeperServiceName,
+		"com.beeper.bridge.network":        puppet.bridge.BeeperNetworkName,
+		"com.beeper.bridge.is_network_bot": puppet.IsBot,
+	}
+	if puppet.IsWebhook {
+		contactInfo["com.beeper.bridge.identifiers"] = []string{}
+	}
+	err := puppet.DefaultIntent().BeeperUpdateProfile(contactInfo)
+	if err != nil {
+		puppet.log.Warn().Err(err).Msg("Failed to store custom contact info in profile")
+	} else {
+		puppet.ContactInfoSet = true
+	}
+}

thread.go

@@ -1,10 +1,13 @@
 package main
 
 import (
+	"context"
 	"sync"
 	"time"
 
 	"github.com/bwmarrin/discordgo"
+	"github.com/rs/zerolog"
+	"golang.org/x/exp/slices"
 	"maunium.net/go/mautrix/id"
 
 	"go.mau.fi/mautrix-discord/database"
@@ -14,7 +17,8 @@ type Thread struct {
 	*database.Thread
 	Parent *Portal
 
-	creationNoticeLock sync.Mutex
+	creationNoticeLock       sync.Mutex
+	initialBackfillAttempted bool
 }
 
 func (br *DiscordBridge) GetThreadByID(id string, root *database.Message) *Thread {
@@ -74,19 +78,80 @@ func (br *DiscordBridge) loadThread(dbThread *database.Thread, id string, root *
 	return thread
 }
 
+func (br *DiscordBridge) threadFound(ctx context.Context, source *User, rootMessage *database.Message, id string, metadata *discordgo.Channel) {
+	thread := br.GetThreadByID(id, rootMessage)
+	log := zerolog.Ctx(ctx)
+	log.Debug().Msg("Marked message as thread root")
+	if thread.CreationNoticeMXID == "" {
+		thread.Parent.sendThreadCreationNotice(ctx, thread)
+	}
+	// TODO member_ids_preview is probably not guaranteed to contain the source user
+	if source != nil && metadata != nil && slices.Contains(metadata.MemberIDsPreview, source.DiscordID) && !source.IsInPortal(thread.ID) {
+		source.MarkInPortal(database.UserPortal{
+			DiscordID: thread.ID,
+			Type:      database.UserPortalTypeThread,
+			Timestamp: time.Now(),
+		})
+		if metadata.MessageCount > 0 {
+			go thread.maybeInitialBackfill(source)
+		} else {
+			thread.initialBackfillAttempted = true
+		}
+	}
+}
+
+func (thread *Thread) maybeInitialBackfill(source *User) {
+	if thread.initialBackfillAttempted || thread.Parent.bridge.Config.Bridge.Backfill.Limits.Initial.Thread == 0 {
+		return
+	}
+	thread.Parent.forwardBackfillLock.Lock()
+	if thread.Parent.bridge.DB.Message.GetLastInThread(thread.Parent.Key, thread.ID) != nil {
+		thread.Parent.forwardBackfillLock.Unlock()
+		return
+	}
+	thread.Parent.forwardBackfillInitial(source, thread)
+}
+
 func (thread *Thread) Join(user *User) {
 	if user.IsInPortal(thread.ID) {
 		return
 	}
-	user.log.Debugfln("Joining thread %s@%s", thread.ID, thread.ParentID)
-	err := user.Session.ThreadJoinWithLocation(thread.ID, discordgo.ThreadJoinLocationContextMenu)
+	log := user.log.With().Str("thread_id", thread.ID).Str("channel_id", thread.ParentID).Logger()
+	log.Debug().Msg("Joining thread")
+
+	var doBackfill, backfillStarted bool
+	if !thread.initialBackfillAttempted && thread.Parent.bridge.Config.Bridge.Backfill.Limits.Initial.Thread > 0 {
+		thread.Parent.forwardBackfillLock.Lock()
+		lastMessage := thread.Parent.bridge.DB.Message.GetLastInThread(thread.Parent.Key, thread.ID)
+		if lastMessage != nil {
+			thread.Parent.forwardBackfillLock.Unlock()
+		} else {
+			doBackfill = true
+			defer func() {
+				if !backfillStarted {
+					thread.Parent.forwardBackfillLock.Unlock()
+				}
+			}()
+		}
+	}
+
+	var err error
+	if user.Session.IsUser {
+		err = user.Session.ThreadJoinWithLocation(thread.ID, discordgo.ThreadJoinLocationContextMenu)
+	} else {
+		err = user.Session.ThreadJoin(thread.ID)
+	}
 	if err != nil {
-		user.log.Errorfln("Error joining thread %s@%s: %v", thread.ID, thread.ParentID, err)
+		log.Error().Err(err).Msg("Error joining thread")
 	} else {
 		user.MarkInPortal(database.UserPortal{
 			DiscordID: thread.ID,
 			Type:      database.UserPortalTypeThread,
 			Timestamp: time.Now(),
 		})
+		if doBackfill {
+			go thread.Parent.forwardBackfillInitial(user, thread)
+			backfillStarted = true
+		}
 	}
 }