client/src/app/+videos/+video-watch/video-watch.component.ts

   1 import { Hotkey, HotkeysService } from 'angular2-hotkeys'
   2 import { forkJoin, Subscription } from 'rxjs'
   3 import { isP2PEnabled } from 'src/assets/player/utils'
   4 import { PlatformLocation } from '@angular/common'
   5 import { Component, ElementRef, Inject, LOCALE_ID, NgZone, OnDestroy, OnInit, ViewChild } from '@angular/core'
   6 import { ActivatedRoute, Router } from '@angular/router'
   7 import {
   8   AuthService,
   9   AuthUser,
  10   ConfirmService,
  11   MetaService,
  12   Notifier,
  13   PeerTubeSocket,
  14   PluginService,
  15   RestExtractor,
  16   ScreenService,
  17   ServerService,
  18   User,
  19   UserService
  20 } from '@app/core'
  21 import { HooksService } from '@app/core/plugins/hooks.service'
  22 import { isXPercentInViewport, scrollToTop } from '@app/helpers'
  23 import { Video, VideoCaptionService, VideoDetails, VideoService } from '@app/shared/shared-main'
  24 import { SubscribeButtonComponent } from '@app/shared/shared-user-subscription'
  25 import { VideoPlaylist, VideoPlaylistService } from '@app/shared/shared-video-playlist'
  26 import { timeToInt } from '@shared/core-utils'
  27 import {
  28   HTMLServerConfig,
  29   HttpStatusCode,
  30   PeerTubeProblemDocument,
  31   ServerErrorCode,
  32   VideoCaption,
  33   VideoPrivacy,
  34   VideoState
  35 } from '@shared/models'
  36 import { cleanupVideoWatch, getStoredTheater, getStoredVideoWatchHistory } from '../../../assets/player/peertube-player-local-storage'
  37 import {
  38   CustomizationOptions,
  39   P2PMediaLoaderOptions,
  40   PeertubePlayerManager,
  41   PeertubePlayerManagerOptions,
  42   PlayerMode,
  43   videojs
  44 } from '../../../assets/player/peertube-player-manager'
  45 import { environment } from '../../../environments/environment'
  46 import { VideoWatchPlaylistComponent } from './shared'
  47
  48 type URLOptions = CustomizationOptions & { playerMode: PlayerMode }
  49
  50 @Component({
  51   selector: 'my-video-watch',
  52   templateUrl: './video-watch.component.html',
  53   styleUrls: [ './video-watch.component.scss' ]
  54 })
  55 export class VideoWatchComponent implements OnInit, OnDestroy {
  56   @ViewChild('videoWatchPlaylist', { static: true }) videoWatchPlaylist: VideoWatchPlaylistComponent
  57   @ViewChild('subscribeButton') subscribeButton: SubscribeButtonComponent
  58
  59   player: any
  60   playerElement: HTMLVideoElement
  61   playerPlaceholderImgSrc: string
  62   theaterEnabled = false
  63
  64   video: VideoDetails = null
  65   videoCaptions: VideoCaption[] = []
  66
  67   playlistPosition: number
  68   playlist: VideoPlaylist = null
  69
  70   remoteServerDown = false
  71
  72   private nextVideoUUID = ''
  73   private nextVideoTitle = ''
  74
  75   private currentTime: number
  76
  77   private paramsSub: Subscription
  78   private queryParamsSub: Subscription
  79   private configSub: Subscription
  80   private liveVideosSub: Subscription
  81
  82   private serverConfig: HTMLServerConfig
  83
  84   private hotkeys: Hotkey[] = []
  85
  86   constructor (
  87     private elementRef: ElementRef,
  88     private route: ActivatedRoute,
  89     private router: Router,
  90     private videoService: VideoService,
  91     private playlistService: VideoPlaylistService,
  92     private confirmService: ConfirmService,
  93     private metaService: MetaService,
  94     private authService: AuthService,
  95     private userService: UserService,
  96     private serverService: ServerService,
  97     private restExtractor: RestExtractor,
  98     private notifier: Notifier,
  99     private zone: NgZone,
 100     private videoCaptionService: VideoCaptionService,
 101     private hotkeysService: HotkeysService,
 102     private hooks: HooksService,
 103     private pluginService: PluginService,
 104     private peertubeSocket: PeerTubeSocket,
 105     private screenService: ScreenService,
 106     private location: PlatformLocation,
 107     @Inject(LOCALE_ID) private localeId: string
 108   ) { }
 109
 110   get user () {
 111     return this.authService.getUser()
 112   }
 113
 114   get anonymousUser () {
 115     return this.userService.getAnonymousUser()
 116   }
 117
 118   ngOnInit () {
 119     this.serverConfig = this.serverService.getHTMLConfig()
 120
 121     PeertubePlayerManager.initState()
 122
 123     this.loadRouteParams()
 124     this.loadRouteQuery()
 125
 126     this.initHotkeys()
 127
 128     this.theaterEnabled = getStoredTheater()
 129
 130     this.hooks.runAction('action:video-watch.init', 'video-watch')
 131
 132     setTimeout(cleanupVideoWatch, 1500) // Run in timeout to ensure we're not blocking the UI
 133   }
 134
 135   ngOnDestroy () {
 136     this.flushPlayer()
 137
 138     // Unsubscribe subscriptions
 139     if (this.paramsSub) this.paramsSub.unsubscribe()
 140     if (this.queryParamsSub) this.queryParamsSub.unsubscribe()
 141     if (this.configSub) this.configSub.unsubscribe()
 142     if (this.liveVideosSub) this.liveVideosSub.unsubscribe()
 143
 144     // Unbind hotkeys
 145     this.hotkeysService.remove(this.hotkeys)
 146   }
 147
 148   getCurrentTime () {
 149     return this.currentTime
 150   }
 151
 152   getCurrentPlaylistPosition () {
 153     return this.videoWatchPlaylist.currentPlaylistPosition
 154   }
 155
 156   onRecommendations (videos: Video[]) {
 157     if (videos.length === 0) return
 158
 159     // The recommended videos's first element should be the next video
 160     const video = videos[0]
 161     this.nextVideoUUID = video.uuid
 162     this.nextVideoTitle = video.name
 163   }
 164
 165   handleTimestampClicked (timestamp: number) {
 166     if (!this.player || this.video.isLive) return
 167
 168     this.player.currentTime(timestamp)
 169     scrollToTop()
 170   }
 171
 172   onPlaylistVideoFound (videoId: string) {
 173     this.loadVideo(videoId)
 174   }
 175
 176   isUserLoggedIn () {
 177     return this.authService.isLoggedIn()
 178   }
 179
 180   isVideoBlur (video: Video) {
 181     return video.isVideoNSFWForUser(this.user, this.serverConfig)
 182   }
 183
 184   isChannelDisplayNameGeneric () {
 185     const genericChannelDisplayName = [
 186       `Main ${this.video.channel.ownerAccount.name} channel`,
 187       `Default ${this.video.channel.ownerAccount.name} channel`
 188     ]
 189
 190     return genericChannelDisplayName.includes(this.video.channel.displayName)
 191   }
 192
 193   displayOtherVideosAsRow () {
 194     // Use the same value as in the SASS file
 195     return this.screenService.getWindowInnerWidth() <= 1100
 196   }
 197
 198   private loadRouteParams () {
 199     this.paramsSub = this.route.params.subscribe(routeParams => {
 200       const videoId = routeParams['videoId']
 201       if (videoId) return this.loadVideo(videoId)
 202
 203       const playlistId = routeParams['playlistId']
 204       if (playlistId) return this.loadPlaylist(playlistId)
 205     })
 206   }
 207
 208   private loadRouteQuery () {
 209     this.queryParamsSub = this.route.queryParams.subscribe(queryParams => {
 210       // Handle the ?playlistPosition
 211       const positionParam = queryParams['playlistPosition'] ?? 1
 212
 213       this.playlistPosition = positionParam === 'last'
 214         ? -1 // Handle the "last" index
 215         : parseInt(positionParam + '', 10)
 216
 217       if (isNaN(this.playlistPosition)) {
 218         console.error(`playlistPosition query param '${positionParam}' was parsed as NaN, defaulting to 1.`)
 219         this.playlistPosition = 1
 220       }
 221
 222       this.videoWatchPlaylist.updatePlaylistIndex(this.playlistPosition)
 223
 224       const start = queryParams['start']
 225       if (this.player && start) this.player.currentTime(parseInt(start, 10))
 226     })
 227   }
 228
 229   private loadVideo (videoId: string) {
 230     if (this.isSameElement(this.video, videoId)) return
 231
 232     if (this.player) this.player.pause()
 233
 234     const videoObs = this.hooks.wrapObsFun(
 235       this.videoService.getVideo.bind(this.videoService),
 236       { videoId },
 237       'video-watch',
 238       'filter:api.video-watch.video.get.params',
 239       'filter:api.video-watch.video.get.result'
 240     )
 241
 242     forkJoin([
 243       videoObs,
 244       this.videoCaptionService.listCaptions(videoId),
 245       this.userService.getAnonymousOrLoggedUser()
 246     ]).subscribe({
 247       next: ([ video, captionsResult, loggedInOrAnonymousUser ]) => {
 248         const queryParams = this.route.snapshot.queryParams
 249
 250         const urlOptions = {
 251           resume: queryParams.resume,
 252
 253           startTime: queryParams.start,
 254           stopTime: queryParams.stop,
 255
 256           muted: queryParams.muted,
 257           loop: queryParams.loop,
 258           subtitle: queryParams.subtitle,
 259
 260           playerMode: queryParams.mode,
 261           peertubeLink: false
 262         }
 263
 264         this.onVideoFetched({ video, videoCaptions: captionsResult.data, loggedInOrAnonymousUser, urlOptions })
 265             .catch(err => this.handleGlobalError(err))
 266       },
 267
 268       error: err => this.handleRequestError(err)
 269     })
 270   }
 271
 272   private loadPlaylist (playlistId: string) {
 273     if (this.isSameElement(this.playlist, playlistId)) return
 274
 275     this.playlistService.getVideoPlaylist(playlistId)
 276       .subscribe({
 277         next: playlist => {
 278           this.playlist = playlist
 279
 280           this.videoWatchPlaylist.loadPlaylistElements(playlist, !this.playlistPosition, this.playlistPosition)
 281         },
 282
 283         error: err => this.handleRequestError(err)
 284       })
 285   }
 286
 287   private isSameElement (element: VideoDetails | VideoPlaylist, newId: string) {
 288     if (!element) return false
 289
 290     return (element.id + '') === newId || element.uuid === newId || element.shortUUID === newId
 291   }
 292
 293   private async handleRequestError (err: any) {
 294     const errorBody = err.body as PeerTubeProblemDocument
 295
 296     if (errorBody?.code === ServerErrorCode.DOES_NOT_RESPECT_FOLLOW_CONSTRAINTS && errorBody.originUrl) {
 297       const originUrl = errorBody.originUrl + (window.location.search ?? '')
 298
 299       const res = await this.confirmService.confirm(
 300         // eslint-disable-next-line max-len
 301         $localize`This video is not available on this instance. Do you want to be redirected on the origin instance: <a href="${originUrl}">${originUrl}</a>?`,
 302         $localize`Redirection`
 303       )
 304
 305       if (res === true) return window.location.href = originUrl
 306     }
 307
 308     // If 400, 403 or 404, the video is private or blocked so redirect to 404
 309     return this.restExtractor.redirectTo404IfNotFound(err, 'video', [
 310       HttpStatusCode.BAD_REQUEST_400,
 311       HttpStatusCode.FORBIDDEN_403,
 312       HttpStatusCode.NOT_FOUND_404
 313     ])
 314   }
 315
 316   private handleGlobalError (err: any) {
 317     const errorMessage: string = typeof err === 'string' ? err : err.message
 318     if (!errorMessage) return
 319
 320     // Display a message in the video player instead of a notification
 321     if (errorMessage.includes('from xs param')) {
 322       this.flushPlayer()
 323       this.remoteServerDown = true
 324
 325       return
 326     }
 327
 328     this.notifier.error(errorMessage)
 329   }
 330
 331   private async onVideoFetched (options: {
 332     video: VideoDetails
 333     videoCaptions: VideoCaption[]
 334     urlOptions: URLOptions
 335     loggedInOrAnonymousUser: User
 336   }) {
 337     const { video, videoCaptions, urlOptions, loggedInOrAnonymousUser } = options
 338
 339     this.subscribeToLiveEventsIfNeeded(this.video, video)
 340
 341     this.video = video
 342     this.videoCaptions = videoCaptions
 343
 344     // Re init attributes
 345     this.playerPlaceholderImgSrc = undefined
 346     this.remoteServerDown = false
 347     this.currentTime = undefined
 348
 349     if (this.isVideoBlur(this.video)) {
 350       const res = await this.confirmService.confirm(
 351         $localize`This video contains mature or explicit content. Are you sure you want to watch it?`,
 352         $localize`Mature or explicit content`
 353       )
 354       if (res === false) return this.location.back()
 355     }
 356
 357     this.buildPlayer(urlOptions, loggedInOrAnonymousUser)
 358       .catch(err => console.error('Cannot build the player', err))
 359
 360     this.setOpenGraphTags()
 361
 362     const hookOptions = {
 363       videojs,
 364       video: this.video,
 365       playlist: this.playlist
 366     }
 367     this.hooks.runAction('action:video-watch.video.loaded', 'video-watch', hookOptions)
 368   }
 369
 370   private async buildPlayer (urlOptions: URLOptions, loggedInOrAnonymousUser: User) {
 371     // Flush old player if needed
 372     this.flushPlayer()
 373
 374     const videoState = this.video.state.id
 375     if (videoState === VideoState.LIVE_ENDED || videoState === VideoState.WAITING_FOR_LIVE) {
 376       this.playerPlaceholderImgSrc = this.video.previewPath
 377       return
 378     }
 379
 380     // Build video element, because videojs removes it on dispose
 381     const playerElementWrapper = this.elementRef.nativeElement.querySelector('#videojs-wrapper')
 382     this.playerElement = document.createElement('video')
 383     this.playerElement.className = 'video-js vjs-peertube-skin'
 384     this.playerElement.setAttribute('playsinline', 'true')
 385     playerElementWrapper.appendChild(this.playerElement)
 386
 387     const params = {
 388       video: this.video,
 389       videoCaptions: this.videoCaptions,
 390       urlOptions,
 391       loggedInOrAnonymousUser,
 392       user: this.user
 393     }
 394     const { playerMode, playerOptions } = await this.hooks.wrapFun(
 395       this.buildPlayerManagerOptions.bind(this),
 396       params,
 397       'video-watch',
 398       'filter:internal.video-watch.player.build-options.params',
 399       'filter:internal.video-watch.player.build-options.result'
 400     )
 401
 402     this.zone.runOutsideAngular(async () => {
 403       this.player = await PeertubePlayerManager.initialize(playerMode, playerOptions, player => this.player = player)
 404
 405       this.player.on('customError', ({ err }: { err: any }) => {
 406         this.zone.run(() => this.handleGlobalError(err))
 407       })
 408
 409       this.player.on('timeupdate', () => {
 410         // Don't need to trigger angular change for this variable, that is sent to children components on click
 411         this.currentTime = Math.floor(this.player.currentTime())
 412       })
 413
 414       /**
 415        * condition: true to make the upnext functionality trigger, false to disable the upnext functionality
 416        *            go to the next video in 'condition()' if you don't want of the timer.
 417        * next: function triggered at the end of the timer.
 418        * suspended: function used at each click of the timer checking if we need to reset progress
 419        *            and wait until suspended becomes truthy again.
 420        */
 421       this.player.upnext({
 422         timeout: 5000, // 5s
 423
 424         headText: $localize`Up Next`,
 425         cancelText: $localize`Cancel`,
 426         suspendedText: $localize`Autoplay is suspended`,
 427
 428         getTitle: () => this.nextVideoTitle,
 429
 430         next: () => this.zone.run(() => this.playNextVideoInAngularZone()),
 431         condition: () => {
 432           if (!this.playlist) return this.isAutoPlayNext()
 433
 434           // Don't wait timeout to play the next playlist video
 435           if (this.isPlaylistAutoPlayNext()) {
 436             this.playNextVideoInAngularZone()
 437             return undefined
 438           }
 439
 440           return false
 441         },
 442
 443         suspended: () => {
 444           return (
 445             !isXPercentInViewport(this.player.el(), 80) ||
 446             !document.getElementById('content').contains(document.activeElement)
 447           )
 448         }
 449       })
 450
 451       this.player.one('stopped', () => {
 452         if (this.playlist && this.isPlaylistAutoPlayNext()) {
 453           this.playNextVideoInAngularZone()
 454         }
 455       })
 456
 457       this.player.one('ended', () => {
 458         if (this.video.isLive) {
 459           this.zone.run(() => this.video.state.id = VideoState.LIVE_ENDED)
 460         }
 461       })
 462
 463       this.player.on('theaterChange', (_: any, enabled: boolean) => {
 464         this.zone.run(() => this.theaterEnabled = enabled)
 465       })
 466
 467       this.hooks.runAction('action:video-watch.player.loaded', 'video-watch', {
 468         player: this.player,
 469         playlist: this.playlist,
 470         playlistPosition: this.playlistPosition,
 471         videojs,
 472         video: this.video
 473       })
 474     })
 475   }
 476
 477   private playNextVideoInAngularZone () {
 478     if (this.playlist) {
 479       this.zone.run(() => this.videoWatchPlaylist.navigateToNextPlaylistVideo())
 480       return
 481     }
 482
 483     if (this.nextVideoUUID) {
 484       this.router.navigate([ '/w', this.nextVideoUUID ])
 485     }
 486   }
 487
 488   private isAutoplay () {
 489     // We'll jump to the thread id, so do not play the video
 490     if (this.route.snapshot.params['threadId']) return false
 491
 492     // Otherwise true by default
 493     if (!this.user) return true
 494
 495     // Be sure the autoPlay is set to false
 496     return this.user.autoPlayVideo !== false
 497   }
 498
 499   private isAutoPlayNext () {
 500     return (
 501       (this.user?.autoPlayNextVideo) ||
 502       this.anonymousUser.autoPlayNextVideo
 503     )
 504   }
 505
 506   private isPlaylistAutoPlayNext () {
 507     return (
 508       (this.user?.autoPlayNextVideoPlaylist) ||
 509       this.anonymousUser.autoPlayNextVideoPlaylist
 510     )
 511   }
 512
 513   private flushPlayer () {
 514     // Remove player if it exists
 515     if (!this.player) return
 516
 517     try {
 518       this.player.dispose()
 519       this.player = undefined
 520     } catch (err) {
 521       console.error('Cannot dispose player.', err)
 522     }
 523   }
 524
 525   private buildPlayerManagerOptions (params: {
 526     video: VideoDetails
 527     videoCaptions: VideoCaption[]
 528     urlOptions: CustomizationOptions & { playerMode: PlayerMode }
 529     loggedInOrAnonymousUser: User
 530     user?: AuthUser
 531   }) {
 532     const { video, videoCaptions, urlOptions, loggedInOrAnonymousUser, user } = params
 533
 534     const getStartTime = () => {
 535       const byUrl = urlOptions.startTime !== undefined
 536       const byHistory = video.userHistory && (!this.playlist || urlOptions.resume !== undefined)
 537       const byLocalStorage = getStoredVideoWatchHistory(video.uuid)
 538
 539       if (byUrl) return timeToInt(urlOptions.startTime)
 540       if (byHistory) return video.userHistory.currentTime
 541       if (byLocalStorage) return byLocalStorage.duration
 542
 543       return 0
 544     }
 545
 546     let startTime = getStartTime()
 547
 548     // If we are at the end of the video, reset the timer
 549     if (video.duration - startTime <= 1) startTime = 0
 550
 551     const playerCaptions = videoCaptions.map(c => ({
 552       label: c.language.label,
 553       language: c.language.id,
 554       src: environment.apiUrl + c.captionPath
 555     }))
 556
 557     const options: PeertubePlayerManagerOptions = {
 558       common: {
 559         autoplay: this.isAutoplay(),
 560         p2pEnabled: isP2PEnabled(video, this.serverConfig, loggedInOrAnonymousUser.p2pEnabled),
 561
 562         nextVideo: () => this.playNextVideoInAngularZone(),
 563
 564         playerElement: this.playerElement,
 565         onPlayerElementChange: (element: HTMLVideoElement) => this.playerElement = element,
 566
 567         videoDuration: video.duration,
 568         enableHotkeys: true,
 569         inactivityTimeout: 2500,
 570         poster: video.previewUrl,
 571
 572         startTime,
 573         stopTime: urlOptions.stopTime,
 574         controls: urlOptions.controls,
 575         muted: urlOptions.muted,
 576         loop: urlOptions.loop,
 577         subtitle: urlOptions.subtitle,
 578
 579         peertubeLink: urlOptions.peertubeLink,
 580
 581         theaterButton: true,
 582         captions: videoCaptions.length !== 0,
 583
 584         videoViewUrl: video.privacy.id !== VideoPrivacy.PRIVATE
 585           ? this.videoService.getVideoViewUrl(video.uuid)
 586           : null,
 587         embedUrl: video.embedUrl,
 588         embedTitle: video.name,
 589
 590         isLive: video.isLive,
 591
 592         language: this.localeId,
 593
 594         userWatching: user && user.videosHistoryEnabled === true
 595           ? {
 596             url: this.videoService.getUserWatchingVideoUrl(video.uuid),
 597             authorizationHeader: this.authService.getRequestHeaderValue()
 598           }
 599           : undefined,
 600
 601         serverUrl: environment.apiUrl,
 602
 603         videoCaptions: playerCaptions,
 604
 605         videoShortUUID: video.shortUUID,
 606         videoUUID: video.uuid
 607       },
 608
 609       webtorrent: {
 610         videoFiles: video.files
 611       },
 612
 613       pluginsManager: this.pluginService.getPluginsManager()
 614     }
 615
 616     // Only set this if we're in a playlist
 617     if (this.playlist) {
 618       options.common.previousVideo = () => {
 619         this.zone.run(() => this.videoWatchPlaylist.navigateToPreviousPlaylistVideo())
 620       }
 621     }
 622
 623     let mode: PlayerMode
 624
 625     if (urlOptions.playerMode) {
 626       if (urlOptions.playerMode === 'p2p-media-loader') mode = 'p2p-media-loader'
 627       else mode = 'webtorrent'
 628     } else {
 629       if (video.hasHlsPlaylist()) mode = 'p2p-media-loader'
 630       else mode = 'webtorrent'
 631     }
 632
 633     // p2p-media-loader needs TextEncoder, fallback on WebTorrent if not available
 634     if (typeof TextEncoder === 'undefined') {
 635       mode = 'webtorrent'
 636     }
 637
 638     if (mode === 'p2p-media-loader') {
 639       const hlsPlaylist = video.getHlsPlaylist()
 640
 641       const p2pMediaLoader = {
 642         playlistUrl: hlsPlaylist.playlistUrl,
 643         segmentsSha256Url: hlsPlaylist.segmentsSha256Url,
 644         redundancyBaseUrls: hlsPlaylist.redundancies.map(r => r.baseUrl),
 645         trackerAnnounce: video.trackerUrls,
 646         videoFiles: hlsPlaylist.files
 647       } as P2PMediaLoaderOptions
 648
 649       Object.assign(options, { p2pMediaLoader })
 650     }
 651
 652     return { playerMode: mode, playerOptions: options }
 653   }
 654
 655   private async subscribeToLiveEventsIfNeeded (oldVideo: VideoDetails, newVideo: VideoDetails) {
 656     if (!this.liveVideosSub) {
 657       this.liveVideosSub = this.buildLiveEventsSubscription()
 658     }
 659
 660     if (oldVideo && oldVideo.id !== newVideo.id) {
 661       this.peertubeSocket.unsubscribeLiveVideos(oldVideo.id)
 662     }
 663
 664     if (!newVideo.isLive) return
 665
 666     await this.peertubeSocket.subscribeToLiveVideosSocket(newVideo.id)
 667   }
 668
 669   private buildLiveEventsSubscription () {
 670     return this.peertubeSocket.getLiveVideosObservable()
 671       .subscribe(({ type, payload }) => {
 672         if (type === 'state-change') return this.handleLiveStateChange(payload.state)
 673         if (type === 'views-change') return this.handleLiveViewsChange(payload.viewers)
 674       })
 675   }
 676
 677   private handleLiveStateChange (newState: VideoState) {
 678     if (newState !== VideoState.PUBLISHED) return
 679
 680     const videoState = this.video.state.id
 681     if (videoState !== VideoState.WAITING_FOR_LIVE && videoState !== VideoState.LIVE_ENDED) return
 682
 683     console.log('Loading video after live update.')
 684
 685     const videoUUID = this.video.uuid
 686
 687     // Reset to force refresh the video
 688     this.video = undefined
 689     this.loadVideo(videoUUID)
 690   }
 691
 692   private handleLiveViewsChange (newViewers: number) {
 693     if (!this.video) {
 694       console.error('Cannot update video live views because video is no defined.')
 695       return
 696     }
 697
 698     console.log('Updating live views.')
 699
 700     this.video.viewers = newViewers
 701   }
 702
 703   private initHotkeys () {
 704     this.hotkeys = [
 705       // These hotkeys are managed by the player
 706       new Hotkey('f', e => e, undefined, $localize`Enter/exit fullscreen (requires player focus)`),
 707       new Hotkey('space', e => e, undefined, $localize`Play/Pause the video (requires player focus)`),
 708       new Hotkey('m', e => e, undefined, $localize`Mute/unmute the video (requires player focus)`),
 709
 710       new Hotkey('0-9', e => e, undefined, $localize`Skip to a percentage of the video: 0 is 0% and 9 is 90% (requires player focus)`),
 711
 712       new Hotkey('up', e => e, undefined, $localize`Increase the volume (requires player focus)`),
 713       new Hotkey('down', e => e, undefined, $localize`Decrease the volume (requires player focus)`),
 714
 715       new Hotkey('right', e => e, undefined, $localize`Seek the video forward (requires player focus)`),
 716       new Hotkey('left', e => e, undefined, $localize`Seek the video backward (requires player focus)`),
 717
 718       new Hotkey('>', e => e, undefined, $localize`Increase playback rate (requires player focus)`),
 719       new Hotkey('<', e => e, undefined, $localize`Decrease playback rate (requires player focus)`),
 720
 721       new Hotkey('.', e => e, undefined, $localize`Navigate in the video frame by frame (requires player focus)`)
 722     ]
 723
 724     if (this.isUserLoggedIn()) {
 725       this.hotkeys = this.hotkeys.concat([
 726         new Hotkey('shift+s', () => {
 727           if (this.subscribeButton.isSubscribedToAll()) this.subscribeButton.unsubscribe()
 728           else this.subscribeButton.subscribe()
 729
 730           return false
 731         }, undefined, $localize`Subscribe to the account`)
 732       ])
 733     }
 734
 735     this.hotkeysService.add(this.hotkeys)
 736   }
 737
 738   private setOpenGraphTags () {
 739     this.metaService.setTitle(this.video.name)
 740
 741     this.metaService.setTag('og:type', 'video')
 742
 743     this.metaService.setTag('og:title', this.video.name)
 744     this.metaService.setTag('name', this.video.name)
 745
 746     this.metaService.setTag('og:description', this.video.description)
 747     this.metaService.setTag('description', this.video.description)
 748
 749     this.metaService.setTag('og:image', this.video.previewPath)
 750
 751     this.metaService.setTag('og:duration', this.video.duration.toString())
 752
 753     this.metaService.setTag('og:site_name', 'PeerTube')
 754
 755     this.metaService.setTag('og:url', window.location.href)
 756     this.metaService.setTag('url', window.location.href)
 757   }
 758 }