Implemented the all powerful WebSocketAPI Controller

docs/PlaybackAPI_WebSocket.md

@@ -84,4 +84,18 @@ This channel is sent on average every 100 - 200 milliseconds.  You **will** rece
 
 ## Controlling the application
 
-### *Coming Soon*
+### All Powerful Controller
+
+You can use **ANY** method from the `gmusic-utils` library --> https://github.com/gmusic-utils/gmusic.js
+
+All you need to do is send a message to the websocket with a stringified JSON object in the form.
+
+```js
+{
+  "namespace": "playback",
+  "method": "setPlaybackTime",
+  "arguments": [10000]
+}
+```
+ Detailed object requirements
+| Attribute |

src/inject/GPMInject/playback/handler.js

@@ -39,4 +39,11 @@ window.wait(() => {
       lastScrobble = currentSong;
     }
   });
+
+  Emitter.on('execute:gmusic', (event, cmd) => {
+    if (window.GPM && GPM[cmd.namespace] && GPM[cmd.namespace][cmd.method]
+      && typeof GPM[cmd.namespace][cmd.method] === 'function') {
+      GPM[cmd.namespace][cmd.method].apply(GPM, cmd.args || []);
+    }
+  });
 });

src/main/features/core/websocketAPI.js

@@ -54,6 +54,28 @@ const enableAPI = () => {
         });
       };
 
+      ws.on('message', (data) => {
+        try {
+          const command = JSON.parse(data);
+          if (command.namespace && command.method) {
+            const args = command.arguments || [];
+            if (!Array.isArray(args)) {
+              throw Error('Bad arguments');
+            }
+            Emitter.sendToGooglePlayMusic('execute:gmusic', {
+              namespace: command.namespace,
+              method: command.method,
+              args,
+            });
+          } else {
+            throw Error('Bad command');
+          }
+        } catch (err) {
+          console.log('WebSocketAPI Error: Invalid message recieved'); // eslint-disable-line
+          console.log(data); // eslint-disable-line
+        }
+      });
+
       ws.channel('playState', PlaybackAPI.isPlaying());
       if (PlaybackAPI.currentSong()) {
         ws.channel('song', PlaybackAPI.currentSong());