Set UA and limit simultaneous downloads

router/downloader/downloader.go

@@ -4,8 +4,10 @@ import (
 	"context"
 	"emperror.dev/errors"
 	"encoding/json"
+	"fmt"
 	"github.com/google/uuid"
 	"github.com/pterodactyl/wings/server"
+	"github.com/pterodactyl/wings/system"
 	"io"
 	"net/http"
 	"net/url"
@@ -109,6 +111,7 @@ func (dl *Download) Execute() error {
 	defer dl.Cancel()
 
 	req, _ := http.NewRequestWithContext(ctx, http.MethodGet, dl.req.URL.String(), nil)
+	req.Header.Set("User-Agent", fmt.Sprintf("Pterodactyl Panel (Wings v%s) (https://pterodactyl.io)", system.Version))
 	res, err := client.Do(req)
 	if err != nil {
 		return errors.New("downloader: failed opening request to download file")

router/router_server_files.go

@@ -271,6 +271,13 @@ func postServerPullRemoteFile(c *gin.Context) {
 		WithError(c, err)
 		return
 	}
+	// Do not allow more than three simultaneous remote file downloads at one time.
+	if len(downloader.ByServer(s.Id())) >= 3 {
+		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
+			"error": "This server has reached its limit of 3 simultaneous remote file downloads at once. Please wait for one to complete before trying again.",
+		})
+		return
+	}
 
 	dl := downloader.New(s, downloader.DownloadRequest{
 		URL:       u,