playback: don't leak meta data to the OS if passcode lock is enabled since this voids the privacy added by the lock

NEWS

@@ -19,6 +19,8 @@ Interface:
     more precisely (iPad only)
 * Previously removed episodes and tracks no longer show up in the respective
   group listings (#9705)
+* Improved privacy by requesting the passcode 2 minutes after leaving the app
+  and by obfuscating playback metadata if passcode lock is enabled
 
 Cloud interaction:
 * Added support for downloads from Google Drive (#8690)

Sources/VLCMovieViewController.m

@@ -1149,10 +1149,17 @@
     }
     MLFile * currentFile = _mediaItem;
 
+    /* don't leak sensitive information to the OS, if passcode lock is enabled */
+    BOOL passcodeLockEnabled = [[[NSUserDefaults standardUserDefaults] objectForKey:kVLCSettingPasscodeOnKey] boolValue];
+
     /* we omit artwork for now since we had to read it from storage as we can't access
      * the artwork cache at the moment - FIXME? */
-    NSMutableDictionary *currentlyPlayingTrackInfo = [NSMutableDictionary dictionaryWithObjectsAndKeys: currentFile.title, MPMediaItemPropertyTitle, @(currentFile.duration.intValue / 1000.), MPMediaItemPropertyPlaybackDuration, @(_mediaPlayer.time.intValue / 1000.), MPNowPlayingInfoPropertyElapsedPlaybackTime, @(_mediaPlayer.rate), MPNowPlayingInfoPropertyPlaybackRate, nil];
-    if ([currentFile isAlbumTrack]) {
+    NSMutableDictionary *currentlyPlayingTrackInfo;
+    if (passcodeLockEnabled)
+        currentlyPlayingTrackInfo = [NSMutableDictionary dictionaryWithObjectsAndKeys:@(currentFile.duration.intValue / 1000.), MPMediaItemPropertyPlaybackDuration, @(_mediaPlayer.time.intValue / 1000.), MPNowPlayingInfoPropertyElapsedPlaybackTime, @(_mediaPlayer.rate), MPNowPlayingInfoPropertyPlaybackRate, nil];
+    else
+        currentlyPlayingTrackInfo = [NSMutableDictionary dictionaryWithObjectsAndKeys: currentFile.title, MPMediaItemPropertyTitle, @(currentFile.duration.intValue / 1000.), MPMediaItemPropertyPlaybackDuration, @(_mediaPlayer.time.intValue / 1000.), MPNowPlayingInfoPropertyElapsedPlaybackTime, @(_mediaPlayer.rate), MPNowPlayingInfoPropertyPlaybackRate, nil];
+    if ([currentFile isAlbumTrack] && !passcodeLockEnabled) {
         MLAlbumTrack *track = currentFile.albumTrack;
         if (track.artist.length > 0)
             [currentlyPlayingTrackInfo setObject:track.artist forKey:MPMediaItemPropertyArtist];