1 files changed, 198 insertions, 0 deletions

diff --git a/server/helpers/youtube-dl/youtube-dl-cli.ts b/server/helpers/youtube-dl/youtube-dl-cli.ts
new file mode 100644
index 000000000..440869205
--- /dev/null
+++ b/server/helpers/youtube-dl/youtube-dl-cli.ts
@@ -0,0 +1,198 @@
+import execa from 'execa'
+import { pathExists, writeFile } from 'fs-extra'
+import { join } from 'path'
+import { CONFIG } from '@server/initializers/config'
+import { VideoResolution } from '@shared/models'
+import { logger, loggerTagsFactory } from '../logger'
+import { getProxy, isProxyEnabled } from '../proxy'
+import { isBinaryResponse, peertubeGot } from '../requests'
+
+const lTags = loggerTagsFactory('youtube-dl')
+
+const youtubeDLBinaryPath = join(CONFIG.STORAGE.BIN_DIR, CONFIG.IMPORT.VIDEOS.HTTP.YOUTUBE_DL_RELEASE.NAME)
+
+export class YoutubeDLCLI {
+
+  static async safeGet () {
+    if (!await pathExists(youtubeDLBinaryPath)) {
+      await this.updateYoutubeDLBinary()
+    }
+
+    return new YoutubeDLCLI()
+  }
+
+  static async updateYoutubeDLBinary () {
+    const url = CONFIG.IMPORT.VIDEOS.HTTP.YOUTUBE_DL_RELEASE.URL
+
+    logger.info('Updating youtubeDL binary from %s.', url, lTags())
+
+    const gotOptions = { context: { bodyKBLimit: 20_000 }, responseType: 'buffer' as 'buffer' }
+
+    try {
+      let gotResult = await peertubeGot(url, gotOptions)
+
+      if (!isBinaryResponse(gotResult)) {
+        const json = JSON.parse(gotResult.body.toString())
+        const latest = json.filter(release => release.prerelease === false)[0]
+        if (!latest) throw new Error('Cannot find latest release')
+
+        const releaseName = CONFIG.IMPORT.VIDEOS.HTTP.YOUTUBE_DL_RELEASE.NAME
+        const releaseAsset = latest.assets.find(a => a.name === releaseName)
+        if (!releaseAsset) throw new Error(`Cannot find appropriate release with name ${releaseName} in release assets`)
+
+        gotResult = await peertubeGot(releaseAsset.browser_download_url, gotOptions)
+      }
+
+      if (!isBinaryResponse(gotResult)) {
+        throw new Error('Not a binary response')
+      }
+
+      await writeFile(youtubeDLBinaryPath, gotResult.body)
+
+      logger.info('youtube-dl updated %s.', youtubeDLBinaryPath, lTags())
+    } catch (err) {
+      logger.error('Cannot update youtube-dl from %s.', url, { err, ...lTags() })
+    }
+  }
+
+  static getYoutubeDLVideoFormat (enabledResolutions: VideoResolution[]) {
+    /**
+     * list of format selectors in order or preference
+     * see https://github.com/ytdl-org/youtube-dl#format-selection
+     *
+     * case #1 asks for a mp4 using h264 (avc1) and the exact resolution in the hope
+     * of being able to do a "quick-transcode"
+     * case #2 is the first fallback. No "quick-transcode" means we can get anything else (like vp9)
+     * case #3 is the resolution-degraded equivalent of #1, and already a pretty safe fallback
+     *
+     * in any case we avoid AV1, see https://github.com/Chocobozzz/PeerTube/issues/3499
+     **/
+    const resolution = enabledResolutions.length === 0
+      ? VideoResolution.H_720P
+      : Math.max(...enabledResolutions)
+
+    return [
+      `bestvideo[vcodec^=avc1][height=${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('/')
+  }
+
+  private constructor () {
+
+  }
+
+  download (options: {
+    url: string
+    format: string
+    output: string
+    processOptions: execa.NodeOptions
+    additionalYoutubeDLArgs?: string[]
+  }) {
+    return this.run({
+      url: options.url,
+      processOptions: options.processOptions,
+      args: (options.additionalYoutubeDLArgs || []).concat([ '-f', options.format, '-o', options.output ])
+    })
+  }
+
+  async getInfo (options: {
+    url: string
+    format: string
+    processOptions: execa.NodeOptions
+    additionalYoutubeDLArgs?: string[]
+  }) {
+    const { url, format, additionalYoutubeDLArgs = [], processOptions } = options
+
+    const completeArgs = additionalYoutubeDLArgs.concat([ '--dump-json', '-f', format ])
+
+    const data = await this.run({ url, args: completeArgs, processOptions })
+    const info = data.map(this.parseInfo)
+
+    return info.length === 1
+      ? info[0]
+      : info
+  }
+
+  async getSubs (options: {
+    url: string
+    format: 'vtt'
+    processOptions: execa.NodeOptions
+  }) {
+    const { url, format, processOptions } = options
+
+    const args = [ '--skip-download', '--all-subs', `--sub-format=${format}` ]
+
+    const data = await this.run({ url, args, processOptions })
+    const files: string[] = []
+
+    const skipString = '[info] Writing video subtitles to: '
+
+    for (let i = 0, len = data.length; i < len; i++) {
+      const line = data[i]
+
+      if (line.indexOf(skipString) === 0) {
+        files.push(line.slice(skipString.length))
+      }
+    }
+
+    return files
+  }
+
+  private async run (options: {
+    url: string
+    args: string[]
+    processOptions: execa.NodeOptions
+  }) {
+    const { url, args, processOptions } = options
+
+    let completeArgs = this.wrapWithProxyOptions(args)
+    completeArgs = this.wrapWithIPOptions(completeArgs)
+    completeArgs = this.wrapWithFFmpegOptions(completeArgs)
+
+    const output = await execa('python', [ youtubeDLBinaryPath, ...completeArgs, url ], processOptions)
+
+    logger.debug('Runned youtube-dl command.', { command: output.command, stdout: output.stdout, ...lTags() })
+
+    return output.stdout
+      ? output.stdout.trim().split(/\r?\n/)
+      : undefined
+  }
+
+  private wrapWithProxyOptions (args: string[]) {
+    if (isProxyEnabled()) {
+      logger.debug('Using proxy %s for YoutubeDL', getProxy(), lTags())
+
+      return [ '--proxy', getProxy() ].concat(args)
+    }
+
+    return args
+  }
+
+  private wrapWithIPOptions (args: string[]) {
+    if (CONFIG.IMPORT.VIDEOS.HTTP.FORCE_IPV4) {
+      logger.debug('Force ipv4 for YoutubeDL')
+
+      return [ '--force-ipv4' ].concat(args)
+    }
+
+    return args
+  }
+
+  private wrapWithFFmpegOptions (args: string[]) {
+    if (process.env.FFMPEG_PATH) {
+      logger.debug('Using ffmpeg location %s for YoutubeDL', process.env.FFMPEG_PATH, lTags())
+
+      return [ '--ffmpeg-location', process.env.FFMPEG_PATH ].concat(args)
+    }
+
+    return args
+  }
+
+  private parseInfo (data: string) {
+    return JSON.parse(data)
+  }
+}