✨ Add report capabilities and session api (#40)

package.json

@@ -39,7 +39,8 @@
     "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",

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

@@ -16,6 +16,7 @@ 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 +28,7 @@ export class DiscordVoiceService {
   constructor(
     private readonly discordMessageService: DiscordMessageService,
     private readonly playbackService: PlaybackService,
+    private readonly jellyfinWebSocketService: JellyfinWebSocketService,
   ) {}
 
   @OnEvent('playback.newTrack')
@@ -74,6 +76,8 @@ export class DiscordVoiceService {
       guildId: channel.guildId,
     });
 
+    this.jellyfinWebSocketService.initializeAndConnect();
+
     if (this.voiceConnection == undefined) {
       this.voiceConnection = getVoiceConnection(member.guild.id);
     }

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 +1,43 @@
+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';
+
+@Injectable()
+export class JellyinPlaystateService {
+  private playstateApi: PlaystateApi;
+  private sessionApi: SessionApi;
+
+  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.SetRepeatMode,
+        GeneralCommandType.Play,
+        GeneralCommandType.PlayState,
+      ],
+    });
+
+    this.logger.debug('Reported playback capabilities sucessfully');
+  }
+}

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 {
@@ -14,7 +15,10 @@ export class JellyfinService {
   private systemApi: SystemApi;
   private userId: string;
 
-  constructor(private readonly eventEmitter: EventEmitter2) {}
+  constructor(
+    private eventEmitter: EventEmitter2,
+    private readonly jellyfinPlayState: JellyinPlaystateService,
+  ) {}
 
   init() {
     this.jellyfin = new Jellyfin({
@@ -38,7 +42,7 @@ 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}'`,
@@ -53,7 +57,7 @@ export class JellyfinService {
 
         this.systemApi = getSystemApi(this.api);
 
-        this.eventEmitter.emit('clients.jellyfin.ready');
+        await this.jellyfinPlayState.initializePlayState(this.api);
       })
       .catch((test) => {
         this.logger.error(test);

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

@@ -1,23 +1,165 @@
-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 { SessionMessageType } from '@jellyfin/sdk/lib/generated-client/models';
-import { OnEvent } from '@nestjs/event-emitter';
+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';
 
 @Injectable()
-export class JellyinWebsocketService {
+export class JellyfinWebSocketService implements OnModuleDestroy {
-  constructor(private readonly jellyfinClientManager: JellyfinService) {}
+  private webSocket: WebSocket;
 
-  @OnEvent('clients.jellyfin.ready')
+  private readonly logger = new Logger(JellyfinWebSocketService.name);
-  handleJellyfinBotReady() {
-    console.log('ready!');
 
-    this.openSocket();
+  constructor(
+    private readonly jellyfinService: JellyfinService,
+    private readonly jellyfinSearchService: JellyfinSearchService,
+    private readonly playbackService: PlaybackService,
+    private readonly jellyfinStreamBuilderService: JellyfinStreamBuilderService,
+  ) {}
+
+  @Cron('*/30 * * * * *')
+  private handlePeriodicAliveMessage() {
+    if (
+      this.webSocket === undefined ||
+      this.webSocket.readyState !== WebSocket.OPEN
+    ) {
+      return;
+    }
+
+    this.sendMessage('KeepAlive');
+    this.logger.debug('Sent a KeepAlive package to the server');
   }
 
-  private async openSocket() {
+  initializeAndConnect() {
-    const systemApi = getPlaystateApi(this.jellyfinClientManager.getApi());
+    const deviceId = this.jellyfinService.getJellyfin().deviceInfo.id;
+    const url = this.buildSocketUrl(
+      this.jellyfinService.getApi().basePath,
+      this.jellyfinService.getApi().accessToken,
+      deviceId,
+    );
 
-    // TODO: Write socket playstate api to report playback progress
+    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 { ItemIds: string[]; StartIndex: number };
+        const ids = data.ItemIds;
+
+        this.jellyfinSearchService
+          .getById(ids[data.StartIndex])
+          .then((response) => {
+            const track: Track = {
+              name: response.Name,
+              durationInMilliseconds: response.RunTimeTicks / 1000,
+              jellyfinId: response.Id,
+              streamUrl: this.jellyfinStreamBuilderService.buildStreamUrl(
+                response.Id,
+                96000,
+              ),
+              remoteImages: {
+                Images: [],
+                Providers: [],
+                TotalRecordCount: 0,
+              },
+            };
+            this.playbackService.enqueTrackAndInstantyPlay(track);
+          });
+        break;
+      default:
+        this.logger.warn(
+          `Received a package from the socket of unknown type: ${msg.MessageType}`,
+        );
+        break;
+    }
+  }
+
+  private bindWebSocketEvents() {
+    this.webSocket.on('message', this.messageHandler.bind(this));
+  }
+
+  private buildSocketUrl(baseName: string, apiToken: string, device: string) {
+    const url = new URL(baseName);
+    url.pathname = '/socket';
+    url.protocol = url.protocol.replace('http', 'ws');
+    url.search = `?api_key=${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/playback/playback.service.ts

@@ -86,6 +86,18 @@ export class PlaybackService {
     return this.playlist.tracks.findIndex((x) => x.id === uuid);
   }
 
+  enqueTrackAndInstantyPlay(track: Track) {
+    const uuid = uuidv4();
+
+    this.playlist.tracks.push({
+      id: uuid,
+      track: track,
+    });
+
+    this.setActiveTrack(uuid);
+    this.controlAudioPlayer();
+  }
+
   set(tracks: Track[]) {
     this.playlist.tracks = tracks.map((t) => ({
       id: uuidv4(),