Various updates to backend.

Implementation of MPRIS in TS.
LastFM now interacts with store object passed directly into class.
Experimental decorators enabled and utilised in MPRIS.

src/main/plugins/mpris.ts

@@ -0,0 +1,196 @@
+// @ts-ignore
+import * as Player from 'mpris-service';
+
+export default class MPRIS {
+    /**
+     * Private variables for interaction in plugins
+     */
+    private _win: any;
+    private _app: any;
+
+    /**
+     * Base Plugin Details (Eventually implemented into a GUI in settings)
+     */
+    public name: string = 'MPRIS Service';
+    public description: string = 'Handles MPRIS service calls for Linux systems.';
+    public version: string = '1.0.0';
+    public author: string = 'Core';
+
+    /**
+     * MPRIS Service
+     */
+    private mpris: any;
+    private mprisEvents: Object = {
+        "playpause": "pausePlay",
+        "play": "pausePlay",
+        "pause": "pausePlay",
+        "next": "nextTrack",
+        "previous": "previousTrack",
+    }
+
+    /*******************************************************************************************
+     * Private Methods
+     * ****************************************************************************************/
+
+    /**
+     * Runs a media event
+     * @param type - pausePlay, nextTrack, PreviousTrack
+     * @private
+     */
+    private runMediaEvent(type: string) {
+        if (this._win) {
+            this._win.webContents.executeJavaScript(`MusicKitInterop.${type}()`).catch(console.error)
+        }
+    }
+
+    /**
+     * Blocks non-linux systems from running this plugin
+     * @private
+     */
+    private static linuxOnly(_target: any, _propertyKey: string, descriptor: PropertyDescriptor) {
+        if (process.platform !== 'linux') {
+            descriptor.value = function () {
+                return
+            }
+        }
+
+    }
+
+
+    /**
+     * Connects to MPRIS Service
+     */
+    @MPRIS.linuxOnly
+    private connect() {
+        this.mpris = Player({
+            name: 'Cider',
+            identity: 'Cider',
+            supportedUriSchemes: [],
+            supportedMimeTypes: [],
+            supportedInterfaces: ['player']
+        });
+        this.mpris = Object.assign(this.mpris, {
+            canQuit: true,
+            canControl: true,
+            canPause: true,
+            canPlay: true,
+            canGoNext: true,
+            active: true
+        })
+
+
+        const pos_atr = {durationInMillis: 0};
+        this.mpris.getPosition = function () {
+            const durationInMicro = pos_atr.durationInMillis * 1000;
+            const percentage = parseFloat("0") || 0;
+            return durationInMicro * percentage;
+        }
+
+        for (const [key, value] of Object.entries(this.mprisEvents)) {
+            this.mpris.on(key, () => {
+                this.runMediaEvent(value)
+            });
+        }
+    }
+
+    /**
+     * Update MPRIS Player Attributes
+     */
+    @MPRIS.linuxOnly
+    private updatePlayer(attributes: any) {
+
+        const MetaData = {
+            'mpris:trackid': this.mpris.objectPath(`track/${attributes.playParams.id.replace(/[.]+/g, "")}`),
+            'mpris:length': attributes.durationInMillis * 1000, // In microseconds
+            'mpris:artUrl': (attributes.artwork.url.replace('/{w}x{h}bb', '/512x512bb')).replace('/2000x2000bb', '/35x35bb'),
+            'xesam:title': `${attributes.name}`,
+            'xesam:album': `${attributes.albumName}`,
+            'xesam:artist': [`${attributes.artistName}`,],
+            'xesam:genre': attributes.genreNames
+        }
+
+        if (this.mpris.metadata["mpris:trackid"] === MetaData["mpris:trackid"]) {
+            return
+        }
+
+        this.mpris.metadata = MetaData
+
+    }
+
+    /**
+     * Update MPRIS Player State
+     * @private
+     * @param attributes
+     */
+    @MPRIS.linuxOnly
+    private updatePlayerState(attributes: any) {
+
+        let status = 'Stopped';
+        if (attributes.status) {
+            status = 'Playing';
+        } else if (attributes.status === false) {
+            status = 'Paused';
+        }
+
+        if (this.mpris.playbackStatus === status) {
+            return
+        }
+        this.mpris.playbackStatus = status;
+    }
+
+    /**
+     * Clear state
+     * @private
+     */
+    private clearState() {
+        this.mpris.metadata = {'mpris:trackid': '/org/mpris/MediaPlayer2/TrackList/NoTrack'}
+        this.mpris.playbackStatus = 'Stopped';
+    }
+
+
+    /*******************************************************************************************
+     * Public Methods
+     * ****************************************************************************************/
+
+    /**
+     * Runs on plugin load (Currently run on application start)
+     */
+    constructor(app: any, _store: any) {
+        this._app = app;
+        console.log(`[${this.name}] plugin loaded`);
+    }
+
+    /**
+     * Runs on app ready
+     */
+    onReady(win: any): void {
+        this._win = win;
+        console.log(`[${this.name}] plugin ready`);
+        this.connect()
+    }
+
+    /**
+     * Runs on app stop
+     */
+    onBeforeQuit(): void {
+        console.log(`[${this.name}] plugin stopped`);
+        this.clearState()
+    }
+
+    /**
+     * Runs on playback State Change
+     * @param attributes Music Attributes (attributes.state = current state)
+     */
+    onPlaybackStateDidChange(attributes: object): void {
+        this.updatePlayerState(attributes)
+    }
+
+    /**
+     * Runs on song change
+     * @param attributes Music Attributes
+     */
+    onNowPlayingItemDidChange(attributes: object): void {
+        this.updatePlayer(attributes);
+    }
+
+}