server: add updateTags message to update db

lib/player.js

@@ -51,6 +51,13 @@ var DB_FILE_PROPS = [
   'composerName', 'performerName', 'lastQueueDate',
 ];
 
+var EDITABLE_PROPS = [
+  'name', 'artistName', 'albumArtistName',
+  'albumName', 'compilation', 'track', 'trackCount',
+  'disc', 'discCount', 'year', 'genre',
+  'composerName', 'performerName'
+];
+
 // how many GrooveFiles to keep open, ready to be decoded
 var OPEN_FILE_COUNT = 8;
 var PREV_FILE_COUNT = Math.floor(OPEN_FILE_COUNT / 2);
@@ -860,6 +867,22 @@ Player.prototype.addToLibrary = function(args, cb) {
   });
 };
 
+Player.prototype.updateTags = function(obj) {
+  for (var key in obj) {
+    var track = this.libraryIndex.trackTable[key];
+    if (!track) continue;
+    var props = obj[key];
+    if (!props || typeof props !== 'object') continue;
+    for (var i = 0; i < EDITABLE_PROPS.length; i += 1) {
+      var prop = EDITABLE_PROPS[i];
+      if (! (prop in props)) continue;
+      track[prop] = props[prop];
+    }
+    this.persist(track);
+    this.emit('updateDbTrack', track);
+  }
+};
+
 Player.prototype.insertTracks = function(index, keys, tagAsRandom) {
   if (keys.length === 0) return;
   if (index < 0) index = 0;

lib/player_server.js

@@ -113,6 +113,13 @@ PlayerServer.actions = {
       }
     },
   },
+  'updateTags': {
+    permission: 'admin',
+    args: 'object',
+    fn: function(self, client, obj) {
+      self.player.updateTags(obj);
+    },
+  },
   'unsubscribe': {
     permission: 'read',
     args: 'string',