1 files changed, 135 insertions, 0 deletions

diff --git a/server/helpers/youtube-dl/youtube-dl-wrapper.ts b/server/helpers/youtube-dl/youtube-dl-wrapper.ts
new file mode 100644
index 000000000..6960fbae4
--- /dev/null
+++ b/server/helpers/youtube-dl/youtube-dl-wrapper.ts
@@ -0,0 +1,135 @@
+import { move, pathExists, readdir, remove } from 'fs-extra'
+import { dirname, join } from 'path'
+import { CONFIG } from '@server/initializers/config'
+import { isVideoFileExtnameValid } from '../custom-validators/videos'
+import { logger, loggerTagsFactory } from '../logger'
+import { generateVideoImportTmpPath } from '../utils'
+import { YoutubeDLCLI } from './youtube-dl-cli'
+import { YoutubeDLInfo, YoutubeDLInfoBuilder } from './youtube-dl-info-builder'
+
+const lTags = loggerTagsFactory('youtube-dl')
+
+export type YoutubeDLSubs = {
+  language: string
+  filename: string
+  path: string
+}[]
+
+const processOptions = {
+  maxBuffer: 1024 * 1024 * 10 // 10MB
+}
+
+class YoutubeDLWrapper {
+
+  constructor (private readonly url: string = '', private readonly enabledResolutions: number[] = []) {
+
+  }
+
+  async getInfoForDownload (youtubeDLArgs: string[] = []): Promise<YoutubeDLInfo> {
+    const youtubeDL = await YoutubeDLCLI.safeGet()
+
+    const info = await youtubeDL.getInfo({
+      url: this.url,
+      format: YoutubeDLCLI.getYoutubeDLVideoFormat(this.enabledResolutions),
+      additionalYoutubeDLArgs: youtubeDLArgs,
+      processOptions
+    })
+
+    if (info.is_live === true) throw new Error('Cannot download a live streaming.')
+
+    const infoBuilder = new YoutubeDLInfoBuilder(info)
+
+    return infoBuilder.getInfo()
+  }
+
+  async getSubtitles (): Promise<YoutubeDLSubs> {
+    const cwd = CONFIG.STORAGE.TMP_DIR
+
+    const youtubeDL = await YoutubeDLCLI.safeGet()
+
+    const files = await youtubeDL.getSubs({ url: this.url, format: 'vtt', processOptions: { cwd } })
+    if (!files) return []
+
+    logger.debug('Get subtitles from youtube dl.', { url: this.url, files, ...lTags() })
+
+    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 subtitles
+  }
+
+  async downloadVideo (fileExt: string, timeout: number): Promise<string> {
+    // Leave empty the extension, youtube-dl will add it
+    const pathWithoutExtension = generateVideoImportTmpPath(this.url, '')
+
+    let timer: NodeJS.Timeout
+
+    logger.info('Importing youtubeDL video %s to %s', this.url, pathWithoutExtension, lTags())
+
+    const youtubeDL = await YoutubeDLCLI.safeGet()
+
+    const timeoutPromise = new Promise<string>((_, rej) => {
+      timer = setTimeout(() => rej(new Error('YoutubeDL download timeout.')), timeout)
+    })
+
+    const downloadPromise = youtubeDL.download({
+      url: this.url,
+      format: YoutubeDLCLI.getYoutubeDLVideoFormat(this.enabledResolutions),
+      output: pathWithoutExtension,
+      processOptions
+    }).then(() => clearTimeout(timer))
+      .then(async () => {
+        // 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 this.guessVideoPathWithExtension(pathWithoutExtension, fileExt)
+      })
+
+    return Promise.race([ downloadPromise, timeoutPromise ])
+      .catch(async err => {
+        const path = await this.guessVideoPathWithExtension(pathWithoutExtension, fileExt)
+
+        remove(path)
+          .catch(err => logger.error('Cannot remove file in youtubeDL timeout.', { err, ...lTags() }))
+
+        throw err
+      })
+  }
+
+  private async guessVideoPathWithExtension (tmpPath: string, sourceExt: string) {
+    if (!isVideoFileExtnameValid(sourceExt)) {
+      throw new Error('Invalid video extension ' + sourceExt)
+    }
+
+    const extensions = [ sourceExt, '.mp4', '.mkv', '.webm' ]
+
+    for (const extension of extensions) {
+      const path = tmpPath + extension
+
+      if (await pathExists(path)) return path
+    }
+
+    const directoryContent = await readdir(dirname(tmpPath))
+
+    throw new Error(`Cannot guess path of ${tmpPath}. Directory content: ${directoryContent.join(', ')}`)
+  }
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  YoutubeDLWrapper
+}