beginning of work to save queue to server

backend/app.go

@@ -305,7 +305,7 @@ func (a *App) Shutdown() {
 	a.MPRISHandler.Shutdown()
 	a.PlaybackManager.DisableCallbacks()
 	if a.Config.Application.SavePlayQueue {
-		SavePlayQueue(a.ServerManager.ServerID.String(), a.PlaybackManager, configdir.LocalConfig(a.appName, savedQueueFile))
+		SavePlayQueue(a.ServerManager.ServerID.String(), a.PlaybackManager, configdir.LocalConfig(a.appName, savedQueueFile), false)
 	}
 	a.PlaybackManager.Stop() // will trigger scrobble check
 	a.Config.LocalPlayback.Volume = a.LocalPlayer.GetVolume()

backend/mediaprovider/mediaprovider.go

@@ -258,6 +258,11 @@ type SupportsSharing interface {
 	CanShareArtists() bool
 }
 
+type CanSavePlayQueue interface {
+	SavePlayQueue(trackIDs []string, currentTrackPos int, timeSeconds int) error
+	GetPlayQueue() (*SavedPlayQueue, error)
+}
+
 type LyricsProvider interface {
 	GetLyrics(track *Track) (*Lyrics, error)
 }

backend/mediaprovider/model.go

@@ -133,6 +133,12 @@ type LyricLine struct {
 	Start float64 // seconds
 }
 
+type SavedPlayQueue struct {
+	Tracks   []*Track
+	TrackPos int
+	TimePos  int // seconds
+}
+
 type ContentType int
 
 const (

backend/mediaprovider/subsonic/subsonicmediaprovider.go

@@ -379,6 +379,27 @@ func (s *subsonicMediaProvider) GetLyrics(track *mediaprovider.Track) (*mediapro
 	return mpLyrics, nil
 }
 
+// CanSavePlayQueue interface
+
+func (s *subsonicMediaProvider) SavePlayQueue(trackIDs []string, currentTrackPos int, timeSeconds int) error {
+	return s.client.SavePlayQueue(trackIDs, map[string]string{
+		"current":  trackIDs[currentTrackPos],
+		"position": strconv.Itoa(timeSeconds * 1000),
+	})
+}
+
+func (s *subsonicMediaProvider) GetPlayQueue() (*mediaprovider.SavedPlayQueue, error) {
+	pq, err := s.client.GetPlayQueue()
+	if err != nil {
+		return nil, err
+	}
+	savedQueue := &mediaprovider.SavedPlayQueue{}
+	savedQueue.Tracks = sharedutil.MapSlice(pq.Entries, toTrack)
+	savedQueue.TrackPos = pq.Current
+	savedQueue.TimePos = int(pq.Position)
+	return savedQueue, nil
+}
+
 func toTrack(ch *subsonic.Child) *mediaprovider.Track {
 	if ch == nil {
 		return nil

backend/savedplayqueue.go

@@ -22,7 +22,7 @@ type serializedSavedPlayQueue struct {
 }
 
 // SavePlayQueue saves the current play queue and playback position to a JSON file.
-func SavePlayQueue(serverID string, pm *PlaybackManager, filepath string) error {
+func SavePlayQueue(serverID string, pm *PlaybackManager, filepath string, saveToServer bool) error {
 	queue := pm.GetPlayQueue()
 	stats := pm.PlayerStatus()
 	trackIdx := pm.NowPlayingIndex()
@@ -38,12 +38,12 @@ func SavePlayQueue(serverID string, pm *PlaybackManager, filepath string) error
 		TrackIndex: trackIdx,
 		TimePos:    stats.TimePos,
 	}
-	b, err := json.Marshal(saved)
-	if err != nil {
-		return err
-	}
+	b, _ := json.Marshal(saved)
+	err := os.WriteFile(filepath, b, 0644)
 
-	return os.WriteFile(filepath, b, 0644)
+	if saveToServer {
+	}
+	return err
 }
 
 // Loads the saved play queue from the given filepath using the current server.