🔀 Version 0.0.3 (#45)

Version 0.0.3

package.json

@@ -1,6 +1,6 @@
 {
   "name": "jellyfin-discord-music-bot",
-  "version": "0.0.1",
+  "version": "0.0.3",
   "description": "",
   "author": "manuel-rw",
   "private": true,
@@ -32,6 +32,7 @@
     "@nestjs/event-emitter": "^1.3.1",
     "@nestjs/platform-express": "^9.0.0",
     "@nestjs/schedule": "^2.1.0",
+    "@nestjs/terminus": "^9.1.4",
     "date-fns": "^2.29.3",
     "discord.js": "^14.7.1",
     "joi": "^17.7.0",
@@ -39,7 +40,8 @@
     "reflect-metadata": "^0.1.13",
     "rimraf": "^3.0.2",
     "rxjs": "^7.2.0",
-    "uuid": "^9.0.0"
+    "uuid": "^9.0.0",
+    "ws": "^8.11.0"
   },
   "devDependencies": {
     "@nestjs/cli": "^9.0.0",
@@ -48,7 +50,7 @@
     "@types/cron": "^2.0.0",
     "@types/express": "^4.17.13",
     "@types/jest": "28.1.8",
-    "@types/node": "^16.0.0",
+    "@types/node": "^18.0.0",
     "@types/supertest": "^2.0.11",
     "@typescript-eslint/eslint-plugin": "^5.0.0",
     "@typescript-eslint/parser": "^5.0.0",

src/app.module.ts

@@ -10,6 +10,7 @@ import { DiscordConfigService } from './clients/discord/discord.config.service';
 import { DiscordClientModule } from './clients/discord/discord.module';
 import { JellyfinClientModule } from './clients/jellyfin/jellyfin.module';
 import { CommandModule } from './commands/command.module';
+import { HealthModule } from './health/health.module';
 import { PlaybackModule } from './playback/playback.module';
 import { UpdatesModule } from './updates/updates.module';
 
@@ -36,6 +37,7 @@ import { UpdatesModule } from './updates/updates.module';
     JellyfinClientModule,
     PlaybackModule,
     UpdatesModule,
+    HealthModule,
   ],
   controllers: [],
   providers: [],

src/clients/discord/discord.module.ts

@@ -3,12 +3,13 @@ import { Module } from '@nestjs/common';
 import { OnModuleDestroy } from '@nestjs/common/interfaces/hooks';
 import { CommandExecutionError } from '../../middleware/command-execution-filter';
 import { PlaybackModule } from '../../playback/playback.module';
+import { JellyfinClientModule } from '../jellyfin/jellyfin.module';
 import { DiscordConfigService } from './discord.config.service';
 import { DiscordMessageService } from './discord.message.service';
 import { DiscordVoiceService } from './discord.voice.service';
 
 @Module({
-  imports: [PlaybackModule],
+  imports: [PlaybackModule, JellyfinClientModule],
   controllers: [],
   providers: [
     DiscordConfigService,

src/clients/discord/discord.voice.service.ts

@@ -11,11 +11,12 @@ import {
 } from '@discordjs/voice';
 import { Injectable } from '@nestjs/common';
 import { Logger } from '@nestjs/common/services';
-import { OnEvent } from '@nestjs/event-emitter';
+import { EventEmitter2, OnEvent } from '@nestjs/event-emitter';
 import { GuildMember } from 'discord.js';
 import { GenericTryHandler } from '../../models/generic-try-handler';
 import { PlaybackService } from '../../playback/playback.service';
 import { Track } from '../../types/track';
+import { JellyfinWebSocketService } from '../jellyfin/jellyfin.websocket.service';
 import { DiscordMessageService } from './discord.message.service';
 
 @Injectable()
@@ -27,6 +28,8 @@ export class DiscordVoiceService {
   constructor(
     private readonly discordMessageService: DiscordMessageService,
     private readonly playbackService: PlaybackService,
+    private readonly jellyfinWebSocketService: JellyfinWebSocketService,
+    private readonly eventEmitter: EventEmitter2,
   ) {}
 
   @OnEvent('playback.newTrack')
@@ -74,6 +77,8 @@ export class DiscordVoiceService {
       guildId: channel.guildId,
     });
 
+    this.jellyfinWebSocketService.initializeAndConnect();
+
     if (this.voiceConnection == undefined) {
       this.voiceConnection = getVoiceConnection(member.guild.id);
     }
@@ -91,15 +96,20 @@ export class DiscordVoiceService {
   /**
    * Pauses the current audio player
    */
+  @OnEvent('playback.control.pause')
   pause() {
     this.createAndReturnOrGetAudioPlayer().pause();
+    this.eventEmitter.emit('playback.state.pause', true);
   }
 
   /**
    * Stops the audio player
    */
+  @OnEvent('playback.control.stop')
   stop(force: boolean): boolean {
-    return this.createAndReturnOrGetAudioPlayer().stop(force);
+    const stopped = this.createAndReturnOrGetAudioPlayer().stop(force);
+    this.eventEmitter.emit('playback.state.stop');
+    return stopped;
   }
 
   /**
@@ -107,6 +117,7 @@ export class DiscordVoiceService {
    */
   unpause() {
     this.createAndReturnOrGetAudioPlayer().unpause();
+    this.eventEmitter.emit('playback.state.pause', false);
   }
 
   /**
@@ -132,6 +143,7 @@ export class DiscordVoiceService {
    * Checks if the current state is paused or not and toggles the states to the opposite.
    * @returns The new paused state - true: paused, false: unpaused
    */
+  @OnEvent('playback.control.togglePause')
   togglePaused(): boolean {
     if (this.isPaused()) {
       this.unpause();

src/clients/jellyfin/jellyfin.module.ts

@@ -2,14 +2,17 @@ import { Module, OnModuleDestroy, OnModuleInit } from '@nestjs/common';
 import { JellyfinSearchService } from './jellyfin.search.service';
 import { JellyfinService } from './jellyfin.service';
 import { JellyfinStreamBuilderService } from './jellyfin.stream.builder.service';
-import { JellyinWebsocketService } from './jellyfin.websocket.service';
+import { JellyinPlaystateService } from './jellyfin.playstate.service';
+import { JellyfinWebSocketService } from './jellyfin.websocket.service';
+import { PlaybackModule } from './../../playback/playback.module';
 
 @Module({
-  imports: [],
+  imports: [PlaybackModule],
   controllers: [],
   providers: [
     JellyfinService,
-    JellyinWebsocketService,
+    JellyinPlaystateService,
+    JellyfinWebSocketService,
     JellyfinSearchService,
     JellyfinStreamBuilderService,
   ],
@@ -17,6 +20,7 @@ import { JellyinWebsocketService } from './jellyfin.websocket.service';
     JellyfinService,
     JellyfinSearchService,
     JellyfinStreamBuilderService,
+    JellyfinWebSocketService,
   ],
 })
 export class JellyfinClientModule implements OnModuleInit, OnModuleDestroy {

src/clients/jellyfin/jellyfin.playstate.service.ts

@@ -0,0 +1,79 @@
+import { Injectable, Logger } from '@nestjs/common';
+
+import { Api } from '@jellyfin/sdk';
+import { PlaystateApi } from '@jellyfin/sdk/lib/generated-client/api/playstate-api';
+import { SessionApi } from '@jellyfin/sdk/lib/generated-client/api/session-api';
+import {
+  BaseItemKind,
+  GeneralCommandType,
+} from '@jellyfin/sdk/lib/generated-client/models';
+import { getPlaystateApi } from '@jellyfin/sdk/lib/utils/api/playstate-api';
+import { getSessionApi } from '@jellyfin/sdk/lib/utils/api/session-api';
+import { OnEvent } from '@nestjs/event-emitter';
+import { Track } from '../../types/track';
+import { PlaybackService } from '../../playback/playback.service';
+
+@Injectable()
+export class JellyinPlaystateService {
+  private playstateApi: PlaystateApi;
+  private sessionApi: SessionApi;
+
+  constructor(private readonly playbackService: PlaybackService) {}
+
+  private readonly logger = new Logger(JellyinPlaystateService.name);
+
+  async initializePlayState(api: Api) {
+    this.initializeApis(api);
+    await this.reportCapabilities();
+  }
+
+  private async initializeApis(api: Api) {
+    this.sessionApi = getSessionApi(api);
+    this.playstateApi = getPlaystateApi(api);
+  }
+
+  private async reportCapabilities() {
+    await this.sessionApi.postCapabilities({
+      playableMediaTypes: [BaseItemKind[BaseItemKind.Audio]],
+      supportsMediaControl: true,
+      supportedCommands: [
+        GeneralCommandType.Play,
+        GeneralCommandType.PlayState,
+      ],
+    });
+
+    this.logger.debug('Reported playback capabilities sucessfully');
+  }
+
+  @OnEvent('playback.newTrack')
+  private async onPlaybackNewTrack(track: Track) {
+    await this.playstateApi.reportPlaybackStart({
+      playbackStartInfo: {
+        ItemId: track.jellyfinId,
+      },
+    });
+  }
+
+  @OnEvent('playback.state.pause')
+  private async onPlaybackPaused(isPaused: boolean) {
+    const activeTrack = this.playbackService.getActiveTrack();
+
+    await this.playstateApi.reportPlaybackProgress({
+      playbackProgressInfo: {
+        ItemId: activeTrack.track.jellyfinId,
+        IsPaused: isPaused,
+      },
+    });
+  }
+
+  @OnEvent('playback.state.stop')
+  private async onPlaybackStopped() {
+    const activeTrack = this.playbackService.getActiveTrack();
+
+    await this.playstateApi.reportPlaybackStopped({
+      playbackStopInfo: {
+        ItemId: activeTrack.track.jellyfinId,
+      },
+    });
+  }
+}

src/clients/jellyfin/jellyfin.search.service.ts

@@ -95,6 +95,7 @@ export class JellyfinSearchService {
     const searchApi = getItemsApi(api);
     const { data } = await searchApi.getItems({
       ids: [id],
+      userId: this.jellyfinService.getUserId(),
     });
 
     if (data.Items.length !== 1) {

src/clients/jellyfin/jellyfin.service.ts

@@ -1,10 +1,11 @@
 import { Injectable, Logger } from '@nestjs/common';
 
 import { Api, Jellyfin } from '@jellyfin/sdk';
-import { Constants } from '../../utils/constants';
 import { SystemApi } from '@jellyfin/sdk/lib/generated-client/api/system-api';
 import { getSystemApi } from '@jellyfin/sdk/lib/utils/api/system-api';
 import { EventEmitter2 } from '@nestjs/event-emitter';
+import { Constants } from '../../utils/constants';
+import { JellyinPlaystateService } from './jellyfin.playstate.service';
 
 @Injectable()
 export class JellyfinService {
@@ -13,8 +14,12 @@ export class JellyfinService {
   private api: Api;
   private systemApi: SystemApi;
   private userId: string;
+  private connected = false;
 
-  constructor(private readonly eventEmitter: EventEmitter2) {}
+  constructor(
+    private eventEmitter: EventEmitter2,
+    private readonly jellyfinPlayState: JellyinPlaystateService,
+  ) {}
 
   init() {
     this.jellyfin = new Jellyfin({
@@ -38,7 +43,7 @@ export class JellyfinService {
         process.env.JELLYFIN_AUTHENTICATION_USERNAME,
         process.env.JELLYFIN_AUTHENTICATION_PASSWORD,
       )
-      .then((response) => {
+      .then(async (response) => {
         if (response.data.SessionInfo === undefined) {
           this.logger.error(
             `Failed to authenticate with response code ${response.status}: '${response.data}'`,
@@ -52,11 +57,13 @@ export class JellyfinService {
         this.userId = response.data.SessionInfo.UserId;
 
         this.systemApi = getSystemApi(this.api);
+        this.connected = true;
 
-        this.eventEmitter.emit('clients.jellyfin.ready');
+        await this.jellyfinPlayState.initializePlayState(this.api);
       })
       .catch((test) => {
         this.logger.error(test);
+        this.connected = false;
       });
   }
 
@@ -68,6 +75,7 @@ export class JellyfinService {
       return;
     }
     this.api.logout();
+    this.connected = false;
   }
 
   getApi() {
@@ -85,4 +93,8 @@ export class JellyfinService {
   getUserId() {
     return this.userId;
   }
+
+  isConnected() {
+    return this.connected;
+  }
 }

src/clients/jellyfin/jellyfin.websocket.service.ts

@@ -1,23 +1,216 @@
-import { Injectable } from '@nestjs/common';
+import { Injectable, Logger, OnModuleDestroy } from '@nestjs/common';
+import { Cron } from '@nestjs/schedule';
 import { JellyfinService } from './jellyfin.service';
 
-import { getPlaystateApi } from '@jellyfin/sdk/lib/utils/api/playstate-api';
-import { OnEvent } from '@nestjs/event-emitter';
+import {
+  PlaystateCommand,
+  SessionMessageType,
+} from '@jellyfin/sdk/lib/generated-client/models';
+import { WebSocket } from 'ws';
+import { PlaybackService } from '../../playback/playback.service';
+import { JellyfinSearchService } from './jellyfin.search.service';
+import { JellyfinStreamBuilderService } from './jellyfin.stream.builder.service';
+import { Track } from '../../types/track';
+import { PlayNowCommand, SessionApiSendPlaystateCommandRequest } from '../../types/websocket';
+import { EventEmitter2 } from '@nestjs/event-emitter';
 
 @Injectable()
-export class JellyinWebsocketService {
-  constructor(private readonly jellyfinClientManager: JellyfinService) {}
+export class JellyfinWebSocketService implements OnModuleDestroy {
+  private webSocket: WebSocket;
 
-  @OnEvent('clients.jellyfin.ready')
-  handleJellyfinBotReady() {
-    console.log('ready!');
+  private readonly logger = new Logger(JellyfinWebSocketService.name);
 
-    this.openSocket();
+  constructor(
+    private readonly jellyfinService: JellyfinService,
+    private readonly jellyfinSearchService: JellyfinSearchService,
+    private readonly playbackService: PlaybackService,
+    private readonly jellyfinStreamBuilderService: JellyfinStreamBuilderService,
+    private readonly eventEmitter: EventEmitter2,
+  ) {}
+
+  @Cron('*/30 * * * * *')
+  private handlePeriodicAliveMessage() {
+    if (
+      this.webSocket === undefined ||
+      this.webSocket.readyState !== WebSocket.OPEN
+    ) {
+      return;
     }
 
-  private async openSocket() {
-    const systemApi = getPlaystateApi(this.jellyfinClientManager.getApi());
+    this.sendMessage('KeepAlive');
+    this.logger.debug('Sent a KeepAlive package to the server');
+  }
 
-    // TODO: Write socket playstate api to report playback progress
+  initializeAndConnect() {
+    const deviceId = this.jellyfinService.getJellyfin().deviceInfo.id;
+    const url = this.buildSocketUrl(
+      this.jellyfinService.getApi().basePath,
+      this.jellyfinService.getApi().accessToken,
+      deviceId,
+    );
+
+    this.logger.debug(`Opening WebSocket with client id ${deviceId}...`);
+
+    this.webSocket = new WebSocket(url);
+    this.bindWebSocketEvents();
+  }
+
+  disconnect() {
+    if (!this.webSocket) {
+      this.logger.warn(
+        'Tried to disconnect but WebSocket was unexpectitly undefined',
+      );
+      return;
+    }
+
+    this.logger.debug('Closing WebSocket...');
+    this.webSocket.close();
+  }
+
+  sendMessage(type: string, data?: any) {
+    if (!this.webSocket || this.webSocket.readyState !== WebSocket.OPEN) {
+      throw new Error('Socket not open');
+    }
+
+    const obj: Record<string, any> = { MessageType: type };
+    if (data) obj.Data = data;
+
+    this.webSocket.send(JSON.stringify(obj));
+  }
+
+  getReadyState() {
+    return this.webSocket.readyState;
+  }
+
+  protected messageHandler(data: any) {
+    const msg: JellyMessage<unknown> = JSON.parse(data);
+
+    switch (msg.MessageType) {
+      case SessionMessageType[SessionMessageType.KeepAlive]:
+      case SessionMessageType[SessionMessageType.ForceKeepAlive]:
+        this.logger.debug(
+          `Received a ${msg.MessageType} package from the server`,
+        );
+        break;
+      case SessionMessageType[SessionMessageType.Play]:
+        const data = msg.Data as PlayNowCommand;
+        data.hasSelection = PlayNowCommand.prototype.hasSelection;
+        data.getSelection = PlayNowCommand.prototype.getSelection;
+        const ids = data.getSelection();
+
+        this.logger.debug(
+          `Adding ${ids.length} ids to the queue using controls from the websocket`,
+        );
+
+        ids.forEach((id, index) => {
+          this.jellyfinSearchService
+            .getById(id)
+            .then((response) => {
+              const track: Track = {
+                name: response.Name,
+                durationInMilliseconds: response.RunTimeTicks / 10000,
+                jellyfinId: response.Id,
+                streamUrl: this.jellyfinStreamBuilderService.buildStreamUrl(
+                  response.Id,
+                  96000,
+                ),
+                remoteImages: {
+                  Images: [],
+                  Providers: [],
+                  TotalRecordCount: 0,
+                },
+              };
+
+              const trackId = this.playbackService.enqueueTrack(track);
+
+              if (index !== 0) {
+                return;
+              }
+
+              this.playbackService.setActiveTrack(trackId);
+              this.playbackService.getActiveTrackAndEmitEvent();
+            })
+            .catch((err) => {
+              this.logger.error(err);
+            });
+        });
+        break;
+      case SessionMessageType[SessionMessageType.Playstate]:
+        const sendPlaystateCommandRequest =
+          msg.Data as SessionApiSendPlaystateCommandRequest;
+        this.handleSendPlaystateCommandRequest(sendPlaystateCommandRequest);
+        break;
+      default:
+        this.logger.warn(
+          `Received a package from the socket of unknown type: ${msg.MessageType}`,
+        );
+        break;
     }
   }
+
+  private async handleSendPlaystateCommandRequest(
+    request: SessionApiSendPlaystateCommandRequest,
+  ) {
+    switch (request.Command) {
+      case PlaystateCommand.PlayPause:
+        this.eventEmitter.emitAsync('playback.control.togglePause');
+        break;
+      case PlaystateCommand.Pause:
+        this.eventEmitter.emitAsync('playback.control.pause');
+        break;
+      case PlaystateCommand.Stop:
+        this.eventEmitter.emitAsync('playback.control.stop');
+        break;
+      default:
+        this.logger.warn(
+          `Unable to process incoming playstate command request: ${request.Command}`,
+        );
+        break;
+    }
+  }
+
+  private bindWebSocketEvents() {
+    this.webSocket.on('message', this.messageHandler.bind(this));
+  }
+
+  private buildSocketUrl(baseName: string, apiToken: string, device: string) {
+    const url = new URL(baseName);
+    url.pathname = '/socket';
+    url.protocol = url.protocol.replace('http', 'ws');
+    url.search = `?api_key=${apiToken}&deviceId=${device}`;
+    return url;
+  }
+
+  onModuleDestroy() {
+    this.disconnect();
+  }
+}
+
+export interface JellyMessage<T> {
+  MessageType: string;
+  MessageId?: string;
+  Data: T;
+}
+
+interface JellySockEvents {
+  connected: (s: JellySock, ws: WebSocket) => any;
+  message: (s: JellySock, msg: JellyMessage<any>) => any;
+  disconnected: () => any;
+}
+
+export declare interface JellySock {
+  on<U extends keyof JellySockEvents>(
+    event: U,
+    listener: JellySockEvents[U],
+  ): this;
+
+  once<U extends keyof JellySockEvents>(
+    event: U,
+    listener: JellySockEvents[U],
+  ): this;
+
+  emit<U extends keyof JellySockEvents>(
+    event: U,
+    ...args: Parameters<JellySockEvents[U]>
+  ): boolean;
+}

src/commands/summon.command.ts

@@ -36,6 +36,8 @@ export class SummonCommand implements DiscordCommand {
       embeds: [
         this.discordMessageService.buildMessage({
           title: 'Joined your voicehannel',
+          description:
+            "I'm ready to play media. Use ``Cast to device`` in Jellyfin or the ``/play`` command to get started.",
         }),
       ],
     };

src/health/health.controller.spec.ts

@@ -0,0 +1,18 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { HealthController } from './health.controller';
+
+describe('HealthController', () => {
+  let controller: HealthController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [HealthController],
+    }).compile();
+
+    controller = module.get<HealthController>(HealthController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});

src/health/health.controller.ts

@@ -0,0 +1,23 @@
+import { Controller, Get, Injectable } from '@nestjs/common';
+import { HealthCheck, HealthCheckService } from '@nestjs/terminus';
+import { DiscordHealthIndicator } from './indicators/discord.indicator';
+import { JellyfinHealthIndicator } from './indicators/jellyfin.indicator';
+
+@Injectable()
+@Controller('health')
+export class HealthController {
+  constructor(
+    private readonly health: HealthCheckService,
+    private readonly discordIndicator: DiscordHealthIndicator,
+    private readonly jellyfinHealthIndicator: JellyfinHealthIndicator,
+  ) {}
+
+  @Get()
+  @HealthCheck()
+  healthCheck() {
+    return this.health.check([
+      () => this.discordIndicator.isHealthy('discord'),
+      () => this.jellyfinHealthIndicator.isHealthy('jellyfin'),
+    ]);
+  }
+}

src/health/health.module.ts

@@ -0,0 +1,14 @@
+import { DiscordModule } from '@discord-nestjs/core';
+import { Module } from '@nestjs/common';
+import { TerminusModule } from '@nestjs/terminus';
+import { JellyfinClientModule } from '../clients/jellyfin/jellyfin.module';
+import { HealthController } from './health.controller';
+import { DiscordHealthIndicator } from './indicators/discord.indicator';
+import { JellyfinHealthIndicator } from './indicators/jellyfin.indicator';
+
+@Module({
+  imports: [TerminusModule, JellyfinClientModule, DiscordModule.forFeature()],
+  controllers: [HealthController],
+  providers: [JellyfinHealthIndicator, DiscordHealthIndicator],
+})
+export class HealthModule {}

src/health/indicators/discord.indicator.ts

@@ -0,0 +1,20 @@
+import { InjectDiscordClient } from '@discord-nestjs/core';
+import { Injectable } from '@nestjs/common';
+import { HealthIndicator, HealthIndicatorResult } from '@nestjs/terminus';
+import { Client, Status } from 'discord.js';
+
+@Injectable()
+export class DiscordHealthIndicator extends HealthIndicator {
+  constructor(@InjectDiscordClient() private readonly client: Client) {
+    super();
+  }
+
+  async isHealthy(key: string): Promise<HealthIndicatorResult> {
+    const status = this.client.ws.status;
+
+    return this.getStatus(key, status === Status.Ready, {
+      wsStatus: status,
+      pingInMilliseconds: this.client.ws.ping,
+    });
+  }
+}

src/health/indicators/jellyfin.indicator.ts

@@ -0,0 +1,16 @@
+import { Injectable } from '@nestjs/common';
+import { HealthIndicator, HealthIndicatorResult } from '@nestjs/terminus';
+import { JellyfinService } from '../../clients/jellyfin/jellyfin.service';
+
+@Injectable()
+export class JellyfinHealthIndicator extends HealthIndicator {
+  constructor(private readonly jellyfinService: JellyfinService) {
+    super();
+  }
+
+  async isHealthy(key: string): Promise<HealthIndicatorResult> {
+    const isConnected = this.jellyfinService.isConnected();
+
+    return this.getStatus(key, isConnected);
+  }
+}

src/playback/playback.service.ts

@@ -43,7 +43,7 @@ export class PlaybackService {
 
     const newKey = keys[index + 1];
     this.setActiveTrack(newKey);
-    this.controlAudioPlayer();
+    this.getActiveTrackAndEmitEvent();
     return true;
   }
 
@@ -60,7 +60,7 @@ export class PlaybackService {
     const keys = this.getTrackIds();
     const newKey = keys[index - 1];
     this.setActiveTrack(newKey);
-    this.controlAudioPlayer();
+    this.getActiveTrackAndEmitEvent();
     return true;
   }
 
@@ -80,10 +80,22 @@ export class PlaybackService {
 
     if (emptyBefore) {
       this.setActiveTrack(this.playlist.tracks.find((x) => x.id === uuid).id);
-      this.controlAudioPlayer();
+      this.getActiveTrackAndEmitEvent();
     }
 
-    return this.playlist.tracks.findIndex((x) => x.id === uuid);
+    return uuid;
+  }
+
+  enqueTrackAndInstantyPlay(track: Track) {
+    const uuid = uuidv4();
+
+    this.playlist.tracks.push({
+      id: uuid,
+      track: track,
+    });
+
+    this.setActiveTrack(uuid);
+    this.getActiveTrackAndEmitEvent();
   }
 
   set(tracks: Track[]) {
@@ -121,7 +133,7 @@ export class PlaybackService {
     return this.getTrackIds().indexOf(this.playlist.activeTrack);
   }
 
-  private controlAudioPlayer() {
+  getActiveTrackAndEmitEvent() {
     const activeTrack = this.getActiveTrack();
     this.logger.debug(
       `A new track (${activeTrack.id}) was requested and will be emmitted as an event`,

src/types/websocket.ts

@@ -0,0 +1,60 @@
+import { PlaystateCommand } from '@jellyfin/sdk/lib/generated-client/models';
+
+export class PlayNowCommand {
+  /**
+   * A list of all items available in the parent element.
+   * Usually, this is a list of all tracks in an album or playlist.
+   */
+  ItemIds: string[];
+
+  /**
+   * A nullable index, that references an item in the ItemIds array.
+   * If this index is present, the command sender wishes to play only this specific item.
+   * If there is no index present, the sender would like to play all items in the ItemIds array.
+   */
+  StartIndex?: number;
+
+  /**
+   * An enum of possible play modes.
+   * PlayNow: Play the selection immideatly
+   */
+  PlayCommand: 'PlayNow';
+
+  /**
+   * The user who has sent the command via web socket
+   */
+  ControllingUserId: string;
+
+  hasSelection() {
+    return this.StartIndex !== undefined;
+  }
+
+  getSelection(): string[] {
+    if (this.hasSelection()) {
+      return [this.ItemIds[this.StartIndex]];
+    }
+
+    return this.ItemIds;
+  }
+}
+
+export interface SessionApiSendPlaystateCommandRequest {
+  /**
+   * The MediaBrowser.Model.Session.PlaystateCommand.
+   * @type {PlaystateCommand}
+   * @memberof SessionApiSendPlaystateCommand
+   */
+  readonly Command: PlaystateCommand;
+  /**
+   * The optional position ticks.
+   * @type {number}
+   * @memberof SessionApiSendPlaystateCommand
+   */
+  readonly SeekPositionTicks?: number;
+  /**
+   * The optional controlling user id.
+   * @type {string}
+   * @memberof SessionApiSendPlaystateCommand
+   */
+  readonly ControllingUserId?: string;
+}

src/utils/constants.ts

@@ -3,7 +3,7 @@ export const Constants = {
     Version: {
       Major: 0,
       Minor: 0,
-      Patch: 2,
+      Patch: 3,
       All: () =>
         `${Constants.Metadata.Version.Major}.${Constants.Metadata.Version.Minor}.${Constants.Metadata.Version.Patch}`,
     },