refactor!: use plugin-based system for sources

web/src/ts/player/musickit/index.ts

@@ -1,35 +0,0 @@
-export const useMusicKit = ( storefront: string = 'ch' ) => {
-    const init = async () => {
-        const res = await fetch( import.meta.env.VITE_BACKEND_URL + '/', {
-            'credentials': 'include'
-        } );
-
-        if ( res.status === 200 ) {
-            const token = await res.text();
-
-            await window.MusicKit.configure( {
-                'developerToken': token,
-                'app': {
-                    'name': 'MusicPlayer',
-                    'build': '4',
-                    'icon': 'https://music.janishutz.com/logo.jpg'
-                },
-                'storefront': storefront.toUpperCase()
-            } );
-        }
-
-        isInit = true;
-    };
-
-    let isInit = false;
-
-    if ( !window.MusicKit ) {
-        document.addEventListener( 'musickitloaded', () => {
-            init();
-        } );
-    } else {
-        init();
-    }
-
-    return {};
-};

web/src/ts/player/musickit/playback.ts

@@ -1,9 +0,0 @@
-export const play = () => {};
-
-export const pause = () => {};
-
-export const skip10 = () => {};
-
-export const back10 = () => {};
-
-export const playSong = ( id: string ) => {};

web/src/ts/player/musickit/user.ts

@@ -1,3 +0,0 @@
-export const login = async () => {
-
-};

web/src/ts/player/plugins/interface.d.ts

@@ -0,0 +1,66 @@
+import type {
+    Song
+} from '@/ts/dtype/playlist';
+
+// TODO: Add search interface elements to plugin's args (such as a search interface)
+export type PlayerSourcePluginInitializer = () => Promise<PlayerSourcePlugin>;
+
+export interface PlayerSourcePlugin {
+    /**
+     * The name of the source that is displayed in the UI
+     */
+    'name': string;
+
+    /**
+     * The identifier used in the playlist files
+     */
+    'id': string;
+
+    /**
+     * Implement any login flow here. Optional
+     */
+    'login'?: () => Promise<boolean>;
+
+    /**
+     * Play a song by its ID
+     */
+    'playSong': ( id: string ) => Promise<void>;
+
+    /**
+     * Continue playing the song
+     */
+    'play': () => void;
+
+    /**
+     * Pause the currently playing song
+     */
+    'pause': () => void;
+
+    /**
+     * Stop / unload the current song. This indicates that either the playlist was cleared
+     * or a next song is about to be loaded (possibly from another plugin)
+     */
+    'stop': () => void;
+
+    /**
+     * Seek to a specific point in the song.
+     * @param pos is always given as a percentage (pos \in [0, 1])
+     */
+    'seekTo': ( pos: number ) => void;
+
+    /**
+     * Return the playback position as a percentage of the duration. (return value \in [0, 1])
+     */
+    'getPlaybackPos': () => number;
+
+    /**
+     * Return the song duration in seconds.
+     */
+    'getDuration': () => number;
+
+    /**
+     * Called when user adds another song to the playlist via this source.
+     * You may use the provided interface elements (search bar and popups) to e.g. ask if user wants to use a playlist, album, etc
+     */
+    'addSongsFromThisSource': () => Promise<Song[]>;
+}

web/src/ts/player/plugins/local/index.ts

@@ -0,0 +1,27 @@
+import type {
+    PlayerSourcePlugin,
+    PlayerSourcePluginInitializer
+} from '../interface';
+
+export const useLocalPlayer: PlayerSourcePluginInitializer = async (): Promise<PlayerSourcePlugin> => {
+    const player = document.createElement( 'audio' );
+
+    const playSong = async ( id: string ) => {
+        player.src = id;
+        player.play();
+    };
+
+    return {
+        'id': 'local',
+        'name': 'Local Disk',
+        'play': player.play,
+        'getPlaybackPos': () => player.currentTime / player.duration,
+        'getDuration': () => player.duration,
+        playSong,
+        'seekTo': pos => player.currentTime = pos,
+        'pause': player.pause,
+        'stop': () => player.src = '',
+        // TODO: Implement
+        'addSongsFromThisSource': async () => []
+    };
+};

web/src/ts/player/plugins/musickit/index.ts

@@ -0,0 +1,71 @@
+import 'musickitjs-v3-types';
+import type {
+    PlayerSourcePlugin,
+    PlayerSourcePluginInitializer
+} from '../interface';
+import {
+    musicKitPlayback
+} from './playback';
+
+export const useMusicKit: PlayerSourcePluginInitializer = ( storefront: string = 'ch' ): Promise<PlayerSourcePlugin> => {
+    return new Promise( ( resolve, reject ) => {
+        const init = async ( storefront: string ): Promise<PlayerSourcePlugin> => {
+            const res = await fetch( import.meta.env.VITE_BACKEND_URL + '/', {
+                'credentials': 'include'
+            } );
+
+            if ( res.status === 200 ) {
+                const token = await res.text();
+                const instance = await window.MusicKit.configure( {
+                    'developerToken': token,
+                    'app': {
+                        'name': 'MusicPlayer',
+                        'build': '4',
+                        'icon': 'https://music.janishutz.com/logo.jpg'
+                    },
+                    'storefrontId': storefront.toUpperCase()
+                } );
+                const controls = musicKitPlayback( instance );
+
+                const login = async (): Promise<boolean> => {
+                    try {
+                        await instance.authorize();
+
+                        return true;
+                    } catch {
+                        return false;
+                    }
+                };
+
+                return {
+                    'play': controls.play,
+                    'pause': controls.pause,
+                    'stop': controls.stop,
+                    'playSong': controls.playSong,
+                    'getDuration': controls.getDuration,
+                    'getPlaybackPos': controls.getPlaybackPos,
+                    'id': 'applemusic',
+                    'name': 'Apple Music',
+                    'seekTo': controls.seekTo,
+                    'login': login,
+                    // TODO: Implement
+                    'addSongsFromThisSource': async () => []
+                };
+            } else {
+                throw new Error( 'ERR_AUTH' );
+            }
+        };
+
+        if ( !window.MusicKit ) {
+            document.addEventListener( 'musickitloaded', () => {
+                init( storefront )
+                    .then( resolve )
+                    .catch( reject );
+            } );
+        } else {
+            init( storefront )
+                .then( resolve )
+                .catch( reject );
+        }
+    } );
+};

web/src/ts/player/plugins/musickit/playback.ts

@@ -0,0 +1,46 @@
+import type {
+    MusicKitInstance
+} from 'musickitjs-v3-types/MusicKitInstance';
+
+export const musicKitPlayback = ( musickitInstance: MusicKitInstance ) => {
+    const play = () => {
+        musickitInstance.play();
+    };
+
+    const pause = () => {
+        musickitInstance.pause();
+    };
+
+    const seekTo = ( pos: number ) => {
+        musickitInstance.seekToTime( pos * musickitInstance.currentPlaybackDuration );
+    };
+
+    const playSong = async ( id: string ) => {
+        await musickitInstance.setQueue( {
+            'song': id
+        } );
+        musickitInstance.play();
+    };
+
+    const stop = () => {
+        musickitInstance.stop();
+    };
+
+    const getPlaybackPos = (): number => {
+        return musickitInstance.currentPlaybackProgress;
+    };
+
+    const getDuration = (): number => {
+        return musickitInstance.currentPlaybackDuration;
+    };
+
+    return {
+        play,
+        pause,
+        seekTo,
+        playSong,
+        stop,
+        getPlaybackPos,
+        getDuration
+    };
+};