Use a class for youtube-dl

1 files changed, 275 insertions, 278 deletions

diff --git a/server/helpers/youtube-dl.ts b/server/helpers/youtube-dl.ts
index fac3da6ba..d003ea3cf 100644
--- a/server/helpers/youtube-dl.ts
+++ b/server/helpers/youtube-dl.ts
@@ -6,7 +6,6 @@ import { CONFIG } from '@server/initializers/config'
 import { HttpStatusCode } from '../../shared/core-utils/miscs/http-error-codes'
 import { VideoResolution } from '../../shared/models/videos'
 import { CONSTRAINTS_FIELDS, VIDEO_CATEGORIES, VIDEO_LANGUAGES, VIDEO_LICENCES } from '../initializers/constants'
-import { getEnabledResolutions } from '../lib/video-transcoding'
 import { peertubeTruncate, pipelinePromise, root } from './core-utils'
 import { isVideoFileExtnameValid } from './custom-validators/videos'
 import { logger } from './logger'
@@ -35,361 +34,359 @@ const processOptions = {
   maxBuffer: 1024 * 1024 * 10 // 10MB
 }
 
-function getYoutubeDLInfo (url: string, opts?: string[]): Promise<YoutubeDLInfo> {
-  return new Promise<YoutubeDLInfo>((res, rej) => {
-    let args = opts || [ '-j', '--flat-playlist' ]
+class YoutubeDL {
 
-    if (CONFIG.IMPORT.VIDEOS.HTTP.FORCE_IPV4) {
-      args.push('--force-ipv4')
-    }
+  constructor (private readonly url: string = '', private readonly enabledResolutions: number[] = []) {
 
-    args = wrapWithProxyOptions(args)
-    args = [ '-f', getYoutubeDLVideoFormat() ].concat(args)
+  }
 
-    safeGetYoutubeDL()
-      .then(youtubeDL => {
-        youtubeDL.getInfo(url, args, processOptions, (err, info) => {
-          if (err) return rej(err)
-          if (info.is_live === true) return rej(new Error('Cannot download a live streaming.'))
+  getYoutubeDLInfo (opts?: string[]): Promise<YoutubeDLInfo> {
+    return new Promise<YoutubeDLInfo>((res, rej) => {
+      let args = opts || [ '-j', '--flat-playlist' ]
 
-          const obj = buildVideoInfo(normalizeObject(info))
-          if (obj.name && obj.name.length < CONSTRAINTS_FIELDS.VIDEOS.NAME.min) obj.name += ' video'
+      if (CONFIG.IMPORT.VIDEOS.HTTP.FORCE_IPV4) {
+        args.push('--force-ipv4')
+      }
 
-          return res(obj)
-        })
-      })
-      .catch(err => rej(err))
-  })
-}
+      args = this.wrapWithProxyOptions(args)
+      args = [ '-f', this.getYoutubeDLVideoFormat() ].concat(args)
 
-function getYoutubeDLSubs (url: string, opts?: object): Promise<YoutubeDLSubs> {
-  return new Promise<YoutubeDLSubs>((res, rej) => {
-    const cwd = CONFIG.STORAGE.TMP_DIR
-    const options = opts || { all: true, format: 'vtt', cwd }
-
-    safeGetYoutubeDL()
-      .then(youtubeDL => {
-        youtubeDL.getSubs(url, options, (err, files) => {
-          if (err) return rej(err)
-          if (!files) return []
-
-          logger.debug('Get subtitles from youtube dl.', { url, files })
-
-          const subtitles = files.reduce((acc, filename) => {
-            const matched = filename.match(/\.([a-z]{2})(-[a-z]+)?\.(vtt|ttml)/i)
-            if (!matched || !matched[1]) return acc
-
-            return [
-              ...acc,
-              {
-                language: matched[1],
-                path: join(cwd, filename),
-                filename
-              }
-            ]
-          }, [])
+      YoutubeDL.safeGetYoutubeDL()
+        .then(youtubeDL => {
+          youtubeDL.getInfo(this.url, args, processOptions, (err, info) => {
+            if (err) return rej(err)
+            if (info.is_live === true) return rej(new Error('Cannot download a live streaming.'))
 
-          return res(subtitles)
+            const obj = this.buildVideoInfo(this.normalizeObject(info))
+            if (obj.name && obj.name.length < CONSTRAINTS_FIELDS.VIDEOS.NAME.min) obj.name += ' video'
+
+            return res(obj)
+          })
         })
-      })
-      .catch(err => rej(err))
-  })
-}
+        .catch(err => rej(err))
+    })
+  }
 
-function getYoutubeDLVideoFormat () {
-  /**
-   * list of format selectors in order or preference
-   * see https://github.com/ytdl-org/youtube-dl#format-selection
-   *
-   * case #1 asks for a mp4 using h264 (avc1) and the exact resolution in the hope
-   * of being able to do a "quick-transcode"
-   * case #2 is the first fallback. No "quick-transcode" means we can get anything else (like vp9)
-   * case #3 is the resolution-degraded equivalent of #1, and already a pretty safe fallback
-   *
-   * in any case we avoid AV1, see https://github.com/Chocobozzz/PeerTube/issues/3499
-   **/
-  const enabledResolutions = getEnabledResolutions('vod')
-  const resolution = enabledResolutions.length === 0
-    ? VideoResolution.H_720P
-    : Math.max(...enabledResolutions)
-
-  return [
-    `bestvideo[vcodec^=avc1][height=${resolution}]+bestaudio[ext=m4a]`, // case #1
-    `bestvideo[vcodec!*=av01][vcodec!*=vp9.2][height=${resolution}]+bestaudio`, // case #2
-    `bestvideo[vcodec^=avc1][height<=${resolution}]+bestaudio[ext=m4a]`, // case #3
-    `bestvideo[vcodec!*=av01][vcodec!*=vp9.2]+bestaudio`,
-    'best[vcodec!*=av01][vcodec!*=vp9.2]', // case fallback for known formats
-    'best' // Ultimate fallback
-  ].join('/')
-}
+  getYoutubeDLSubs (opts?: object): Promise<YoutubeDLSubs> {
+    return new Promise<YoutubeDLSubs>((res, rej) => {
+      const cwd = CONFIG.STORAGE.TMP_DIR
+      const options = opts || { all: true, format: 'vtt', cwd }
+
+      YoutubeDL.safeGetYoutubeDL()
+        .then(youtubeDL => {
+          youtubeDL.getSubs(this.url, options, (err, files) => {
+            if (err) return rej(err)
+            if (!files) return []
+
+            logger.debug('Get subtitles from youtube dl.', { url: this.url, files })
+
+            const subtitles = files.reduce((acc, filename) => {
+              const matched = filename.match(/\.([a-z]{2})(-[a-z]+)?\.(vtt|ttml)/i)
+              if (!matched || !matched[1]) return acc
+
+              return [
+                ...acc,
+                {
+                  language: matched[1],
+                  path: join(cwd, filename),
+                  filename
+                }
+              ]
+            }, [])
+
+            return res(subtitles)
+          })
+        })
+        .catch(err => rej(err))
+    })
+  }
 
-function downloadYoutubeDLVideo (url: string, fileExt: string, timeout: number) {
-  // Leave empty the extension, youtube-dl will add it
-  const pathWithoutExtension = generateVideoImportTmpPath(url, '')
+  getYoutubeDLVideoFormat () {
+    /**
+     * list of format selectors in order or preference
+     * see https://github.com/ytdl-org/youtube-dl#format-selection
+     *
+     * case #1 asks for a mp4 using h264 (avc1) and the exact resolution in the hope
+     * of being able to do a "quick-transcode"
+     * case #2 is the first fallback. No "quick-transcode" means we can get anything else (like vp9)
+     * case #3 is the resolution-degraded equivalent of #1, and already a pretty safe fallback
+     *
+     * in any case we avoid AV1, see https://github.com/Chocobozzz/PeerTube/issues/3499
+     **/
+    const resolution = this.enabledResolutions.length === 0
+      ? VideoResolution.H_720P
+      : Math.max(...this.enabledResolutions)
+
+    return [
+      `bestvideo[vcodec^=avc1][height=${resolution}]+bestaudio[ext=m4a]`, // case #1
+      `bestvideo[vcodec!*=av01][vcodec!*=vp9.2][height=${resolution}]+bestaudio`, // case #2
+      `bestvideo[vcodec^=avc1][height<=${resolution}]+bestaudio[ext=m4a]`, // case #3
+      `bestvideo[vcodec!*=av01][vcodec!*=vp9.2]+bestaudio`,
+      'best[vcodec!*=av01][vcodec!*=vp9.2]', // case fallback for known formats
+      'best' // Ultimate fallback
+    ].join('/')
+  }
 
-  let timer
+  downloadYoutubeDLVideo (fileExt: string, timeout: number) {
+    // Leave empty the extension, youtube-dl will add it
+    const pathWithoutExtension = generateVideoImportTmpPath(this.url, '')
 
-  logger.info('Importing youtubeDL video %s to %s', url, pathWithoutExtension)
+    let timer
 
-  let options = [ '-f', getYoutubeDLVideoFormat(), '-o', pathWithoutExtension ]
-  options = wrapWithProxyOptions(options)
+    logger.info('Importing youtubeDL video %s to %s', this.url, pathWithoutExtension)
 
-  if (process.env.FFMPEG_PATH) {
-    options = options.concat([ '--ffmpeg-location', process.env.FFMPEG_PATH ])
-  }
+    let options = [ '-f', this.getYoutubeDLVideoFormat(), '-o', pathWithoutExtension ]
+    options = this.wrapWithProxyOptions(options)
 
-  logger.debug('YoutubeDL options for %s.', url, { options })
+    if (process.env.FFMPEG_PATH) {
+      options = options.concat([ '--ffmpeg-location', process.env.FFMPEG_PATH ])
+    }
 
-  return new Promise<string>((res, rej) => {
-    safeGetYoutubeDL()
-      .then(youtubeDL => {
-        youtubeDL.exec(url, options, processOptions, async err => {
-          clearTimeout(timer)
+    logger.debug('YoutubeDL options for %s.', this.url, { options })
 
-          try {
-            // If youtube-dl did not guess an extension for our file, just use .mp4 as default
-            if (await pathExists(pathWithoutExtension)) {
-              await move(pathWithoutExtension, pathWithoutExtension + '.mp4')
-            }
+    return new Promise<string>((res, rej) => {
+      YoutubeDL.safeGetYoutubeDL()
+        .then(youtubeDL => {
+          youtubeDL.exec(this.url, options, processOptions, async err => {
+            clearTimeout(timer)
+
+            try {
+              // If youtube-dl did not guess an extension for our file, just use .mp4 as default
+              if (await pathExists(pathWithoutExtension)) {
+                await move(pathWithoutExtension, pathWithoutExtension + '.mp4')
+              }
 
-            const path = await guessVideoPathWithExtension(pathWithoutExtension, fileExt)
+              const path = await this.guessVideoPathWithExtension(pathWithoutExtension, fileExt)
 
-            if (err) {
-              remove(path)
-                .catch(err => logger.error('Cannot delete path on YoutubeDL error.', { err }))
+              if (err) {
+                remove(path)
+                  .catch(err => logger.error('Cannot delete path on YoutubeDL error.', { err }))
 
+                return rej(err)
+              }
+
+              return res(path)
+            } catch (err) {
               return rej(err)
             }
-
-            return res(path)
-          } catch (err) {
-            return rej(err)
-          }
+          })
+
+          timer = setTimeout(() => {
+            const err = new Error('YoutubeDL download timeout.')
+
+            this.guessVideoPathWithExtension(pathWithoutExtension, fileExt)
+              .then(path => remove(path))
+              .finally(() => rej(err))
+              .catch(err => {
+                logger.error('Cannot remove file in youtubeDL timeout.', { err })
+                return rej(err)
+              })
+          }, timeout)
         })
+        .catch(err => rej(err))
+    })
+  }
 
-        timer = setTimeout(() => {
-          const err = new Error('YoutubeDL download timeout.')
+  buildOriginallyPublishedAt (obj: any) {
+    let originallyPublishedAt: Date = null
 
-          guessVideoPathWithExtension(pathWithoutExtension, fileExt)
-            .then(path => remove(path))
-            .finally(() => rej(err))
-            .catch(err => {
-              logger.error('Cannot remove file in youtubeDL timeout.', { err })
-              return rej(err)
-            })
-        }, timeout)
-      })
-      .catch(err => rej(err))
-  })
-}
-
-// Thanks: https://github.com/przemyslawpluta/node-youtube-dl/blob/master/lib/downloader.js
-// We rewrote it to avoid sync calls
-async function updateYoutubeDLBinary () {
-  logger.info('Updating youtubeDL binary.')
+    const uploadDateMatcher = /^(\d{4})(\d{2})(\d{2})$/.exec(obj.upload_date)
+    if (uploadDateMatcher) {
+      originallyPublishedAt = new Date()
+      originallyPublishedAt.setHours(0, 0, 0, 0)
 
-  const binDirectory = join(root(), 'node_modules', 'youtube-dl', 'bin')
-  const bin = join(binDirectory, 'youtube-dl')
-  const detailsPath = join(binDirectory, 'details')
-  const url = process.env.YOUTUBE_DL_DOWNLOAD_HOST || 'https://yt-dl.org/downloads/latest/youtube-dl'
+      const year = parseInt(uploadDateMatcher[1], 10)
+      // Month starts from 0
+      const month = parseInt(uploadDateMatcher[2], 10) - 1
+      const day = parseInt(uploadDateMatcher[3], 10)
 
-  await ensureDir(binDirectory)
+      originallyPublishedAt.setFullYear(year, month, day)
+    }
 
-  try {
-    const result = await got(url, { followRedirect: false })
+    return originallyPublishedAt
+  }
 
-    if (result.statusCode !== HttpStatusCode.FOUND_302) {
-      logger.error('youtube-dl update error: did not get redirect for the latest version link. Status %d', result.statusCode)
-      return
+  private async guessVideoPathWithExtension (tmpPath: string, sourceExt: string) {
+    if (!isVideoFileExtnameValid(sourceExt)) {
+      throw new Error('Invalid video extension ' + sourceExt)
     }
 
-    const newUrl = result.headers.location
-    const newVersion = /yt-dl\.org\/downloads\/(\d{4}\.\d\d\.\d\d(\.\d)?)\/youtube-dl/.exec(newUrl)[1]
+    const extensions = [ sourceExt, '.mp4', '.mkv', '.webm' ]
 
-    const downloadFileStream = got.stream(newUrl)
-    const writeStream = createWriteStream(bin, { mode: 493 })
+    for (const extension of extensions) {
+      const path = tmpPath + extension
 
-    await pipelinePromise(
-      downloadFileStream,
-      writeStream
-    )
-
-    const details = JSON.stringify({ version: newVersion, path: bin, exec: 'youtube-dl' })
-    await writeFile(detailsPath, details, { encoding: 'utf8' })
+      if (await pathExists(path)) return path
+    }
 
-    logger.info('youtube-dl updated to version %s.', newVersion)
-  } catch (err) {
-    logger.error('Cannot update youtube-dl.', { err })
+    throw new Error('Cannot guess path of ' + tmpPath)
   }
-}
 
-async function safeGetYoutubeDL () {
-  let youtubeDL
+  private normalizeObject (obj: any) {
+    const newObj: any = {}
 
-  try {
-    youtubeDL = require('youtube-dl')
-  } catch (e) {
-    // Download binary
-    await updateYoutubeDLBinary()
-    youtubeDL = require('youtube-dl')
-  }
+    for (const key of Object.keys(obj)) {
+      // Deprecated key
+      if (key === 'resolution') continue
 
-  return youtubeDL
-}
+      const value = obj[key]
 
-function buildOriginallyPublishedAt (obj: any) {
-  let originallyPublishedAt: Date = null
+      if (typeof value === 'string') {
+        newObj[key] = value.normalize()
+      } else {
+        newObj[key] = value
+      }
+    }
 
-  const uploadDateMatcher = /^(\d{4})(\d{2})(\d{2})$/.exec(obj.upload_date)
-  if (uploadDateMatcher) {
-    originallyPublishedAt = new Date()
-    originallyPublishedAt.setHours(0, 0, 0, 0)
+    return newObj
+  }
 
-    const year = parseInt(uploadDateMatcher[1], 10)
-    // Month starts from 0
-    const month = parseInt(uploadDateMatcher[2], 10) - 1
-    const day = parseInt(uploadDateMatcher[3], 10)
+  private buildVideoInfo (obj: any): YoutubeDLInfo {
+    return {
+      name: this.titleTruncation(obj.title),
+      description: this.descriptionTruncation(obj.description),
+      category: this.getCategory(obj.categories),
+      licence: this.getLicence(obj.license),
+      language: this.getLanguage(obj.language),
+      nsfw: this.isNSFW(obj),
+      tags: this.getTags(obj.tags),
+      thumbnailUrl: obj.thumbnail || undefined,
+      originallyPublishedAt: this.buildOriginallyPublishedAt(obj),
+      ext: obj.ext
+    }
+  }
 
-    originallyPublishedAt.setFullYear(year, month, day)
+  private titleTruncation (title: string) {
+    return peertubeTruncate(title, {
+      length: CONSTRAINTS_FIELDS.VIDEOS.NAME.max,
+      separator: /,? +/,
+      omission: ' […]'
+    })
   }
 
-  return originallyPublishedAt
-}
+  private descriptionTruncation (description: string) {
+    if (!description || description.length < CONSTRAINTS_FIELDS.VIDEOS.DESCRIPTION.min) return undefined
 
-// ---------------------------------------------------------------------------
+    return peertubeTruncate(description, {
+      length: CONSTRAINTS_FIELDS.VIDEOS.DESCRIPTION.max,
+      separator: /,? +/,
+      omission: ' […]'
+    })
+  }
 
-export {
-  updateYoutubeDLBinary,
-  getYoutubeDLVideoFormat,
-  downloadYoutubeDLVideo,
-  getYoutubeDLSubs,
-  getYoutubeDLInfo,
-  safeGetYoutubeDL,
-  buildOriginallyPublishedAt
-}
+  private isNSFW (info: any) {
+    return info.age_limit && info.age_limit >= 16
+  }
 
-// ---------------------------------------------------------------------------
+  private getTags (tags: any) {
+    if (Array.isArray(tags) === false) return []
 
-async function guessVideoPathWithExtension (tmpPath: string, sourceExt: string) {
-  if (!isVideoFileExtnameValid(sourceExt)) {
-    throw new Error('Invalid video extension ' + sourceExt)
+    return tags
+      .filter(t => t.length < CONSTRAINTS_FIELDS.VIDEOS.TAG.max && t.length > CONSTRAINTS_FIELDS.VIDEOS.TAG.min)
+      .map(t => t.normalize())
+      .slice(0, 5)
   }
 
-  const extensions = [ sourceExt, '.mp4', '.mkv', '.webm' ]
+  private getLicence (licence: string) {
+    if (!licence) return undefined
 
-  for (const extension of extensions) {
-    const path = tmpPath + extension
+    if (licence.includes('Creative Commons Attribution')) return 1
 
-    if (await pathExists(path)) return path
-  }
+    for (const key of Object.keys(VIDEO_LICENCES)) {
+      const peertubeLicence = VIDEO_LICENCES[key]
+      if (peertubeLicence.toLowerCase() === licence.toLowerCase()) return parseInt(key, 10)
+    }
 
-  throw new Error('Cannot guess path of ' + tmpPath)
-}
+    return undefined
+  }
 
-function normalizeObject (obj: any) {
-  const newObj: any = {}
+  private getCategory (categories: string[]) {
+    if (!categories) return undefined
 
-  for (const key of Object.keys(obj)) {
-    // Deprecated key
-    if (key === 'resolution') continue
+    const categoryString = categories[0]
+    if (!categoryString || typeof categoryString !== 'string') return undefined
 
-    const value = obj[key]
+    if (categoryString === 'News & Politics') return 11
 
-    if (typeof value === 'string') {
-      newObj[key] = value.normalize()
-    } else {
-      newObj[key] = value
+    for (const key of Object.keys(VIDEO_CATEGORIES)) {
+      const category = VIDEO_CATEGORIES[key]
+      if (categoryString.toLowerCase() === category.toLowerCase()) return parseInt(key, 10)
     }
-  }
 
-  return newObj
-}
-
-function buildVideoInfo (obj: any): YoutubeDLInfo {
-  return {
-    name: titleTruncation(obj.title),
-    description: descriptionTruncation(obj.description),
-    category: getCategory(obj.categories),
-    licence: getLicence(obj.license),
-    language: getLanguage(obj.language),
-    nsfw: isNSFW(obj),
-    tags: getTags(obj.tags),
-    thumbnailUrl: obj.thumbnail || undefined,
-    originallyPublishedAt: buildOriginallyPublishedAt(obj),
-    ext: obj.ext
+    return undefined
   }
-}
 
-function titleTruncation (title: string) {
-  return peertubeTruncate(title, {
-    length: CONSTRAINTS_FIELDS.VIDEOS.NAME.max,
-    separator: /,? +/,
-    omission: ' […]'
-  })
-}
+  private getLanguage (language: string) {
+    return VIDEO_LANGUAGES[language] ? language : undefined
+  }
 
-function descriptionTruncation (description: string) {
-  if (!description || description.length < CONSTRAINTS_FIELDS.VIDEOS.DESCRIPTION.min) return undefined
+  private wrapWithProxyOptions (options: string[]) {
+    if (CONFIG.IMPORT.VIDEOS.HTTP.PROXY.ENABLED) {
+      logger.debug('Using proxy for YoutubeDL')
 
-  return peertubeTruncate(description, {
-    length: CONSTRAINTS_FIELDS.VIDEOS.DESCRIPTION.max,
-    separator: /,? +/,
-    omission: ' […]'
-  })
-}
+      return [ '--proxy', CONFIG.IMPORT.VIDEOS.HTTP.PROXY.URL ].concat(options)
+    }
 
-function isNSFW (info: any) {
-  return info.age_limit && info.age_limit >= 16
-}
+    return options
+  }
 
-function getTags (tags: any) {
-  if (Array.isArray(tags) === false) return []
+  // Thanks: https://github.com/przemyslawpluta/node-youtube-dl/blob/master/lib/downloader.js
+  // We rewrote it to avoid sync calls
+  static async updateYoutubeDLBinary () {
+    logger.info('Updating youtubeDL binary.')
 
-  return tags
-    .filter(t => t.length < CONSTRAINTS_FIELDS.VIDEOS.TAG.max && t.length > CONSTRAINTS_FIELDS.VIDEOS.TAG.min)
-    .map(t => t.normalize())
-    .slice(0, 5)
-}
+    const binDirectory = join(root(), 'node_modules', 'youtube-dl', 'bin')
+    const bin = join(binDirectory, 'youtube-dl')
+    const detailsPath = join(binDirectory, 'details')
+    const url = process.env.YOUTUBE_DL_DOWNLOAD_HOST || 'https://yt-dl.org/downloads/latest/youtube-dl'
 
-function getLicence (licence: string) {
-  if (!licence) return undefined
+    await ensureDir(binDirectory)
 
-  if (licence.includes('Creative Commons Attribution')) return 1
+    try {
+      const result = await got(url, { followRedirect: false })
 
-  for (const key of Object.keys(VIDEO_LICENCES)) {
-    const peertubeLicence = VIDEO_LICENCES[key]
-    if (peertubeLicence.toLowerCase() === licence.toLowerCase()) return parseInt(key, 10)
-  }
+      if (result.statusCode !== HttpStatusCode.FOUND_302) {
+        logger.error('youtube-dl update error: did not get redirect for the latest version link. Status %d', result.statusCode)
+        return
+      }
 
-  return undefined
-}
+      const newUrl = result.headers.location
+      const newVersion = /yt-dl\.org\/downloads\/(\d{4}\.\d\d\.\d\d(\.\d)?)\/youtube-dl/.exec(newUrl)[1]
 
-function getCategory (categories: string[]) {
-  if (!categories) return undefined
+      const downloadFileStream = got.stream(newUrl)
+      const writeStream = createWriteStream(bin, { mode: 493 })
 
-  const categoryString = categories[0]
-  if (!categoryString || typeof categoryString !== 'string') return undefined
+      await pipelinePromise(
+        downloadFileStream,
+        writeStream
+      )
 
-  if (categoryString === 'News & Politics') return 11
+      const details = JSON.stringify({ version: newVersion, path: bin, exec: 'youtube-dl' })
+      await writeFile(detailsPath, details, { encoding: 'utf8' })
 
-  for (const key of Object.keys(VIDEO_CATEGORIES)) {
-    const category = VIDEO_CATEGORIES[key]
-    if (categoryString.toLowerCase() === category.toLowerCase()) return parseInt(key, 10)
+      logger.info('youtube-dl updated to version %s.', newVersion)
+    } catch (err) {
+      logger.error('Cannot update youtube-dl.', { err })
+    }
   }
 
-  return undefined
-}
-
-function getLanguage (language: string) {
-  return VIDEO_LANGUAGES[language] ? language : undefined
-}
+  static async safeGetYoutubeDL () {
+    let youtubeDL
 
-function wrapWithProxyOptions (options: string[]) {
-  if (CONFIG.IMPORT.VIDEOS.HTTP.PROXY.ENABLED) {
-    logger.debug('Using proxy for YoutubeDL')
+    try {
+      youtubeDL = require('youtube-dl')
+    } catch (e) {
+      // Download binary
+      await this.updateYoutubeDLBinary()
+      youtubeDL = require('youtube-dl')
+    }
 
-    return [ '--proxy', CONFIG.IMPORT.VIDEOS.HTTP.PROXY.URL ].concat(options)
+    return youtubeDL
   }
+}
+
+// ---------------------------------------------------------------------------
 
-  return options
+export {
+  YoutubeDL
 }