chore: auto download external UI when 'external-ui' is set and not empty

Author: Larvan2

component/updater/update_core.go

@@ -230,7 +230,7 @@ func clean() {
 
 // MaxPackageFileSize is a maximum package file length in bytes. The largest
 // package whose size is limited by this constant currently has the size of
-// approximately 9 MiB.
+// approximately 32 MiB.
 const MaxPackageFileSize = 32 * 1024 * 1024
 
 // Download package file and save it to disk

component/updater/update_ui.go

@@ -29,11 +29,6 @@ func UpdateUI() error {
 	xdMutex.Lock()
 	defer xdMutex.Unlock()
 
-	err := prepare_ui()
-	if err != nil {
-		return err
-	}
-
 	data, err := downloadForBytes(ExternalUIURL)
 	if err != nil {
 		return fmt.Errorf("can't download  file: %w", err)
@@ -64,7 +59,7 @@ func UpdateUI() error {
 	return nil
 }
 
-func prepare_ui() error {
+func PrepareUIPath() error {
 	if ExternalUIPath == "" || ExternalUIURL == "" {
 		return ErrIncompleteConf
 	}
@@ -79,7 +74,6 @@ func prepare_ui() error {
 	} else {
 		ExternalUIFolder = ExternalUIPath
 	}
-
 	return nil
 }
 

config/config.go

@@ -677,6 +677,11 @@ func parseGeneral(cfg *RawConfig) (*General, error) {
 		updater.ExternalUIURL = cfg.ExternalUIURL
 	}
 
+	err := updater.PrepareUIPath()
+	if err != nil {
+		log.Errorln("PrepareUIPath error: %s", err)
+	}
+
 	return &General{
 		Inbound: Inbound{
 			Port:              cfg.Port,

hub/executor/executor.go

@@ -23,6 +23,7 @@ import (
 	"github.com/metacubex/mihomo/component/resolver"
 	SNI "github.com/metacubex/mihomo/component/sniffer"
 	"github.com/metacubex/mihomo/component/trie"
+	"github.com/metacubex/mihomo/component/updater"
 	"github.com/metacubex/mihomo/config"
 	C "github.com/metacubex/mihomo/constant"
 	"github.com/metacubex/mihomo/constant/features"
@@ -113,6 +114,7 @@ func ApplyConfig(cfg *config.Config, force bool) {
 	runtime.GC()
 	tunnel.OnRunning()
 	hcCompatibleProvider(cfg.Providers)
+	initExternalUI()
 
 	log.SetLevel(cfg.General.LogLevel)
 }
@@ -385,6 +387,18 @@ func updateTunnels(tunnels []LC.Tunnel) {
 	listener.PatchTunnel(tunnels, tunnel.Tunnel)
 }
 
+func initExternalUI() {
+	if updater.ExternalUIFolder != "" {
+		dirEntries, _ := os.ReadDir(updater.ExternalUIFolder)
+		if len(dirEntries) > 0 {
+			log.Infoln("UI already exists")
+		} else {
+			log.Infoln("UI not exists, downloading")
+			updater.UpdateUI()
+		}
+	}
+}
+
 func updateGeneral(general *config.General) {
 	tunnel.SetMode(general.Mode)
 	tunnel.SetFindProcessMode(general.FindProcessMode)

hub/route/configs.go

@@ -402,15 +402,15 @@ func updateConfigs(w http.ResponseWriter, r *http.Request) {
 func updateGeoDatabases(w http.ResponseWriter, r *http.Request) {
 	err := updater.UpdateGeoDatabases()
 	if err != nil {
-		log.Errorln("[REST-API] update GEO databases failed: %v", err)
+		log.Errorln("[GEO] update GEO databases failed: %v", err)
 		render.Status(r, http.StatusInternalServerError)
 		render.JSON(w, r, newError(err.Error()))
 		return
 	}
 
 	cfg, err := executor.ParseWithPath(C.Path.Config())
 	if err != nil {
-		log.Errorln("[REST-API] update GEO databases failed: %v", err)
+		log.Errorln("[GEO] update GEO databases failed: %v", err)
 		render.Status(r, http.StatusInternalServerError)
 		render.JSON(w, r, newError("Error parsing configuration"))
 		return