path: root/client/src/assets/player/peertube-player-manager.ts

import { VideoFile } from '../../../../shared/models/videos'
// @ts-ignore
import * as videojs from 'video.js'
import 'videojs-hotkeys'
import 'videojs-dock'
import 'videojs-contextmenu-ui'
import 'videojs-contrib-quality-levels'
import './peertube-plugin'
import './videojs-components/peertube-link-button'
import './videojs-components/resolution-menu-button'
import './videojs-components/settings-menu-button'
import './videojs-components/p2p-info-button'
import './videojs-components/peertube-load-progress-bar'
import './videojs-components/theater-button'
import { P2PMediaLoaderPluginOptions, UserWatching, VideoJSCaption, VideoJSPluginOptions, videojsUntyped } from './peertube-videojs-typings'
import { buildVideoEmbed, buildVideoLink, copyToClipboard, getRtcConfig } from './utils'
import { getCompleteLocale, getShortLocale, is18nLocale, isDefaultLocale } from '../../../../shared/models/i18n/i18n'
import { segmentValidatorFactory } from './p2p-media-loader/segment-validator'
import { segmentUrlBuilderFactory } from './p2p-media-loader/segment-url-builder'

// Change 'Playback Rate' to 'Speed' (smaller for our settings menu)
videojsUntyped.getComponent('PlaybackRateMenuButton').prototype.controlText_ = 'Speed'
// Change Captions to Subtitles/CC
videojsUntyped.getComponent('CaptionsButton').prototype.controlText_ = 'Subtitles/CC'
// We just want to display 'Off' instead of 'captions off', keep a space so the variable == true (hacky I know)
videojsUntyped.getComponent('CaptionsButton').prototype.label_ = ' '

export type PlayerMode = 'webtorrent' | 'p2p-media-loader'

export type WebtorrentOptions = {
  videoFiles: VideoFile[]
}

export type P2PMediaLoaderOptions = {
  playlistUrl: string
  segmentsSha256Url: string
  trackerAnnounce: string[]
  redundancyBaseUrls: string[]
  videoFiles: VideoFile[]
}

export type CommonOptions = {
  playerElement: HTMLVideoElement
  onPlayerElementChange: (element: HTMLVideoElement) => void

  autoplay: boolean
  videoDuration: number
  enableHotkeys: boolean
  inactivityTimeout: number
  poster: string
  startTime: number | string
  stopTime: number | string

  theaterMode: boolean
  captions: boolean
  peertubeLink: boolean

  videoViewUrl: string
  embedUrl: string

  language?: string
  controls?: boolean
  muted?: boolean
  loop?: boolean
  subtitle?: string

  videoCaptions: VideoJSCaption[]

  userWatching?: UserWatching

  serverUrl: string
}

export type PeertubePlayerManagerOptions = {
  common: CommonOptions,
  webtorrent: WebtorrentOptions,
  p2pMediaLoader?: P2PMediaLoaderOptions
}

export class PeertubePlayerManager {

  private static videojsLocaleCache: { [ path: string ]: any } = {}
  private static playerElementClassName: string

  static getServerTranslations (serverUrl: string, locale: string) {
    const path = PeertubePlayerManager.getLocalePath(serverUrl, locale)
    // It is the default locale, nothing to translate
    if (!path) return Promise.resolve(undefined)

    return fetch(path + '/server.json')
      .then(res => res.json())
      .catch(err => {
        console.error('Cannot get server translations', err)
        return undefined
      })
  }

  static async initialize (mode: PlayerMode, options: PeertubePlayerManagerOptions) {
    let p2pMediaLoader: any

    this.playerElementClassName = options.common.playerElement.className

    if (mode === 'webtorrent') await import('./webtorrent/webtorrent-plugin')
    if (mode === 'p2p-media-loader') {
      [ p2pMediaLoader ] = await Promise.all([
        import('p2p-media-loader-hlsjs'),
        import('./p2p-media-loader/p2p-media-loader-plugin')
      ])
    }

    const videojsOptions = this.getVideojsOptions(mode, options, p2pMediaLoader)

    await this.loadLocaleInVideoJS(options.common.serverUrl, options.common.language)

    const self = this
    return new Promise(res => {
      videojs(options.common.playerElement, videojsOptions, function (this: any) {
        const player = this

        let alreadyFallback = false

        player.tech_.one('error', () => {
          if (!alreadyFallback) self.maybeFallbackToWebTorrent(mode, player, options)
          alreadyFallback = true
        })

        player.one('error', () => {
          if (!alreadyFallback) self.maybeFallbackToWebTorrent(mode, player, options)
          alreadyFallback = true
        })

        self.addContextMenu(mode, player, options.common.embedUrl)

        return res(player)
      })
    })
  }

  private static async maybeFallbackToWebTorrent (currentMode: PlayerMode, player: any, options: PeertubePlayerManagerOptions) {
    if (currentMode === 'webtorrent') return

    console.log('Fallback to webtorrent.')

    const newVideoElement = document.createElement('video')
    newVideoElement.className = this.playerElementClassName

    // VideoJS wraps our video element inside a div
    let currentParentPlayerElement = options.common.playerElement.parentNode
    // Fix on IOS, don't ask me why
    if (!currentParentPlayerElement) currentParentPlayerElement = document.getElementById(options.common.playerElement.id).parentNode

    currentParentPlayerElement.parentNode.insertBefore(newVideoElement, currentParentPlayerElement)

    options.common.playerElement = newVideoElement
    options.common.onPlayerElementChange(newVideoElement)

    player.dispose()

    await import('./webtorrent/webtorrent-plugin')

    const mode = 'webtorrent'
    const videojsOptions = this.getVideojsOptions(mode, options)

    const self = this
    videojs(newVideoElement, videojsOptions, function (this: any) {
      const player = this

      self.addContextMenu(mode, player, options.common.embedUrl)
    })
  }

  private static loadLocaleInVideoJS (serverUrl: string, locale: string) {
    const path = PeertubePlayerManager.getLocalePath(serverUrl, locale)
    // It is the default locale, nothing to translate
    if (!path) return Promise.resolve(undefined)

    let p: Promise<any>

    if (PeertubePlayerManager.videojsLocaleCache[path]) {
      p = Promise.resolve(PeertubePlayerManager.videojsLocaleCache[path])
    } else {
      p = fetch(path + '/player.json')
        .then(res => res.json())
        .then(json => {
          PeertubePlayerManager.videojsLocaleCache[path] = json
          return json
        })
        .catch(err => {
          console.error('Cannot get player translations', err)
          return undefined
        })
    }

    const completeLocale = getCompleteLocale(locale)
    return p.then(json => videojs.addLanguage(getShortLocale(completeLocale), json))
  }

  private static getVideojsOptions (mode: PlayerMode, options: PeertubePlayerManagerOptions, p2pMediaLoaderModule?: any) {
    const commonOptions = options.common
    const webtorrentOptions = options.webtorrent
    const p2pMediaLoaderOptions = options.p2pMediaLoader

    let autoplay = options.common.autoplay
    let html5 = {}

    const plugins: VideoJSPluginOptions = {
      peertube: {
        mode,
        autoplay, // Use peertube plugin autoplay because we get the file by webtorrent
        videoViewUrl: commonOptions.videoViewUrl,
        videoDuration: commonOptions.videoDuration,
        userWatching: commonOptions.userWatching,
        subtitle: commonOptions.subtitle,
        videoCaptions: commonOptions.videoCaptions,
        stopTime: commonOptions.stopTime
      }
    }

    if (mode === 'p2p-media-loader') {
      const p2pMediaLoader: P2PMediaLoaderPluginOptions = {
        redundancyBaseUrls: options.p2pMediaLoader.redundancyBaseUrls,
        type: 'application/x-mpegURL',
        startTime: commonOptions.startTime,
        src: p2pMediaLoaderOptions.playlistUrl
      }

      const trackerAnnounce = p2pMediaLoaderOptions.trackerAnnounce
        .filter(t => t.startsWith('ws'))

      const p2pMediaLoaderConfig = {
        loader: {
          trackerAnnounce,
          segmentValidator: segmentValidatorFactory(options.p2pMediaLoader.segmentsSha256Url),
          rtcConfig: getRtcConfig(),
          requiredSegmentsPriority: 5,
          segmentUrlBuilder: segmentUrlBuilderFactory(options.p2pMediaLoader.redundancyBaseUrls)
        },
        segments: {
          swarmId: p2pMediaLoaderOptions.playlistUrl
        }
      }
      const streamrootHls = {
        levelLabelHandler: (level: { height: number, width: number }) => {
          const file = p2pMediaLoaderOptions.videoFiles.find(f => f.resolution.id === level.height)

          let label = file.resolution.label
          if (file.fps >= 50) label += file.fps

          return label
        },
        html5: {
          hlsjsConfig: {
            liveSyncDurationCount: 7,
            loader: new p2pMediaLoaderModule.Engine(p2pMediaLoaderConfig).createLoaderClass()
          }
        }
      }

      Object.assign(plugins, { p2pMediaLoader, streamrootHls })
      html5 = streamrootHls.html5
    }

    if (mode === 'webtorrent') {
      const webtorrent = {
        autoplay,
        videoDuration: commonOptions.videoDuration,
        playerElement: commonOptions.playerElement,
        videoFiles: webtorrentOptions.videoFiles,
        startTime: commonOptions.startTime
      }
      Object.assign(plugins, { webtorrent })

      // WebTorrent plugin handles autoplay, because we do some hackish stuff in there
      autoplay = false
    }

    const videojsOptions = {
      html5,

      // We don't use text track settings for now
      textTrackSettings: false,
      controls: commonOptions.controls !== undefined ? commonOptions.controls : true,
      loop: commonOptions.loop !== undefined ? commonOptions.loop : false,

      muted: commonOptions.muted !== undefined
        ? commonOptions.muted
        : undefined, // Undefined so the player knows it has to check the local storage

      poster: commonOptions.poster,
      autoplay: autoplay === true ? 'any' : autoplay, // Use 'any' instead of true to get notifier by videojs if autoplay fails
      inactivityTimeout: commonOptions.inactivityTimeout,
      playbackRates: [ 0.5, 0.75, 1, 1.25, 1.5, 2 ],
      plugins,
      controlBar: {
        children: this.getControlBarChildren(mode, {
          captions: commonOptions.captions,
          peertubeLink: commonOptions.peertubeLink,
          theaterMode: commonOptions.theaterMode
        })
      }
    }

    if (commonOptions.enableHotkeys === true) {
      Object.assign(videojsOptions.plugins, {
        hotkeys: {
          enableVolumeScroll: false,
          enableModifiersForNumbers: false,

          fullscreenKey: function (event: KeyboardEvent) {
            // fullscreen with the f key or Ctrl+Enter
            return event.key === 'f' || (event.ctrlKey && event.key === 'Enter')
          },

          seekStep: function (event: KeyboardEvent) {
            // mimic VLC seek behavior, and default to 5 (original value is 5).
            if (event.ctrlKey && event.altKey) {
              return 5 * 60
            } else if (event.ctrlKey) {
              return 60
            } else if (event.altKey) {
              return 10
            } else {
              return 5
            }
          },

          customKeys: {
            increasePlaybackRateKey: {
              key: function (event: KeyboardEvent) {
                return event.key === '>'
              },
              handler: function (player: videojs.Player) {
                player.playbackRate((player.playbackRate() + 0.1).toFixed(2))
              }
            },
            decreasePlaybackRateKey: {
              key: function (event: KeyboardEvent) {
                return event.key === '<'
              },
              handler: function (player: videojs.Player) {
                player.playbackRate((player.playbackRate() - 0.1).toFixed(2))
              }
            },
            frameByFrame: {
              key: function (event: KeyboardEvent) {
                return event.key === '.'
              },
              handler: function (player: videojs.Player) {
                player.pause()
                // Calculate movement distance (assuming 30 fps)
                const dist = 1 / 30
                player.currentTime(player.currentTime() + dist)
              }
            }
          }
        }
      })
    }

    if (commonOptions.language && !isDefaultLocale(commonOptions.language)) {
      Object.assign(videojsOptions, { language: commonOptions.language })
    }

    return videojsOptions
  }

  private static getControlBarChildren (mode: PlayerMode, options: {
    peertubeLink: boolean
    theaterMode: boolean,
    captions: boolean
  }) {
    const settingEntries = []
    const loadProgressBar = mode === 'webtorrent' ? 'peerTubeLoadProgressBar' : 'loadProgressBar'

    // Keep an order
    settingEntries.push('playbackRateMenuButton')
    if (options.captions === true) settingEntries.push('captionsButton')
    settingEntries.push('resolutionMenuButton')

    const children = {
      'playToggle': {},
      'currentTimeDisplay': {},
      'timeDivider': {},
      'durationDisplay': {},
      'liveDisplay': {},

      'flexibleWidthSpacer': {},
      'progressControl': {
        children: {
          'seekBar': {
            children: {
              [loadProgressBar]: {},
              'mouseTimeDisplay': {},
              'playProgressBar': {}
            }
          }
        }
      },

      'p2PInfoButton': {},

      'muteToggle': {},
      'volumeControl': {},

      'settingsButton': {
        setup: {
          maxHeightOffset: 40
        },
        entries: settingEntries
      }
    }

    if (options.peertubeLink === true) {
      Object.assign(children, {
        'peerTubeLinkButton': {}
      })
    }

    if (options.theaterMode === true) {
      Object.assign(children, {
        'theaterButton': {}
      })
    }

    Object.assign(children, {
      'fullscreenToggle': {}
    })

    return children
  }

  private static addContextMenu (mode: PlayerMode, player: any, videoEmbedUrl: string) {
    const content = [
      {
        label: player.localize('Copy the video URL'),
        listener: function () {
          copyToClipboard(buildVideoLink())
        }
      },
      {
        label: player.localize('Copy the video URL at the current time'),
        listener: function () {
          const player = this as videojs.Player
          copyToClipboard(buildVideoLink(player.currentTime()))
        }
      },
      {
        label: player.localize('Copy embed code'),
        listener: () => {
          copyToClipboard(buildVideoEmbed(videoEmbedUrl))
        }
      }
    ]

    if (mode === 'webtorrent') {
      content.push({
        label: player.localize('Copy magnet URI'),
        listener: function () {
          const player = this as videojs.Player
          copyToClipboard(player.webtorrent().getCurrentVideoFile().magnetUri)
        }
      })
    }

    player.contextmenuUI({ content })
  }

  private static getLocalePath (serverUrl: string, locale: string) {
    const completeLocale = getCompleteLocale(locale)

    if (!is18nLocale(completeLocale) || isDefaultLocale(completeLocale)) return undefined

    return serverUrl + '/client/locales/' + completeLocale
  }
}

// ############################################################################

export {
  videojs
}