server/helpers/youtube-dl.ts

   1 import { truncate } from 'lodash'
   2 import { CONSTRAINTS_FIELDS, VIDEO_CATEGORIES } from '../initializers'
   3 import { logger } from './logger'
   4 import { generateVideoTmpPath } from './utils'
   5 import { join } from 'path'
   6 import { root } from './core-utils'
   7 import { ensureDir, writeFile, remove } from 'fs-extra'
   8 import * as request from 'request'
   9 import { createWriteStream } from 'fs'
  10
  11 export type YoutubeDLInfo = {
  12   name?: string
  13   description?: string
  14   category?: number
  15   licence?: number
  16   nsfw?: boolean
  17   tags?: string[]
  18   thumbnailUrl?: string
  19 }
  20
  21 const processOptions = {
  22   maxBuffer: 1024 * 1024 * 10 // 10MB
  23 }
  24
  25 function getYoutubeDLInfo (url: string, opts?: string[]): Promise<YoutubeDLInfo> {
  26   return new Promise<YoutubeDLInfo>(async (res, rej) => {
  27     const args = opts || [ '-j', '--flat-playlist' ]
  28
  29     const youtubeDL = await safeGetYoutubeDL()
  30     youtubeDL.getInfo(url, args, processOptions, (err, info) => {
  31       if (err) return rej(err)
  32       if (info.is_live === true) return rej(new Error('Cannot download a live streaming.'))
  33
  34       const obj = buildVideoInfo(normalizeObject(info))
  35       if (obj.name && obj.name.length < CONSTRAINTS_FIELDS.VIDEOS.NAME.min) obj.name += ' video'
  36
  37       return res(obj)
  38     })
  39   })
  40 }
  41
  42 function downloadYoutubeDLVideo (url: string, timeout: number) {
  43   const path = generateVideoTmpPath(url)
  44   let timer
  45
  46   logger.info('Importing youtubeDL video %s', url)
  47
  48   const options = [ '-f', 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best', '-o', path ]
  49
  50   return new Promise<string>(async (res, rej) => {
  51     const youtubeDL = await safeGetYoutubeDL()
  52     youtubeDL.exec(url, options, processOptions, err => {
  53       clearTimeout(timer)
  54
  55       if (err) {
  56         remove(path)
  57           .catch(err => logger.error('Cannot delete path on YoutubeDL error.', { err }))
  58
  59         return rej(err)
  60       }
  61
  62       return res(path)
  63     })
  64
  65     timer = setTimeout(async () => {
  66       await remove(path)
  67
  68       return rej(new Error('YoutubeDL download timeout.'))
  69     }, timeout)
  70   })
  71 }
  72
  73 // Thanks: https://github.com/przemyslawpluta/node-youtube-dl/blob/master/lib/downloader.js
  74 // We rewrote it to avoid sync calls
  75 async function updateYoutubeDLBinary () {
  76   logger.info('Updating youtubeDL binary.')
  77
  78   const binDirectory = join(root(), 'node_modules', 'youtube-dl', 'bin')
  79   const bin = join(binDirectory, 'youtube-dl')
  80   const detailsPath = join(binDirectory, 'details')
  81   const url = 'https://yt-dl.org/downloads/latest/youtube-dl'
  82
  83   await ensureDir(binDirectory)
  84
  85   return new Promise(res => {
  86     request.get(url, { followRedirect: false }, (err, result) => {
  87       if (err) {
  88         logger.error('Cannot update youtube-dl.', { err })
  89         return res()
  90       }
  91
  92       if (result.statusCode !== 302) {
  93         logger.error('youtube-dl update error: did not get redirect for the latest version link. Status %d', result.statusCode)
  94         return res()
  95       }
  96
  97       const url = result.headers.location
  98       const downloadFile = request.get(url)
  99       const newVersion = /yt-dl\.org\/downloads\/(\d{4}\.\d\d\.\d\d(\.\d)?)\/youtube-dl/.exec(url)[ 1 ]
 100
 101       downloadFile.on('response', result => {
 102         if (result.statusCode !== 200) {
 103           logger.error('Cannot update youtube-dl: new version response is not 200, it\'s %d.', result.statusCode)
 104           return res()
 105         }
 106
 107         downloadFile.pipe(createWriteStream(bin, { mode: 493 }))
 108       })
 109
 110       downloadFile.on('error', err => {
 111         logger.error('youtube-dl update error.', { err })
 112         return res()
 113       })
 114
 115       downloadFile.on('end', () => {
 116         const details = JSON.stringify({ version: newVersion, path: bin, exec: 'youtube-dl' })
 117         writeFile(detailsPath, details, { encoding: 'utf8' }, err => {
 118           if (err) {
 119             logger.error('youtube-dl update error: cannot write details.', { err })
 120             return res()
 121           }
 122
 123           logger.info('youtube-dl updated to version %s.', newVersion)
 124           return res()
 125         })
 126       })
 127     })
 128   })
 129 }
 130
 131 async function safeGetYoutubeDL () {
 132   let youtubeDL
 133
 134   try {
 135     youtubeDL = require('youtube-dl')
 136   } catch (e) {
 137     // Download binary
 138     await updateYoutubeDLBinary()
 139     youtubeDL = require('youtube-dl')
 140   }
 141
 142   return youtubeDL
 143 }
 144
 145 // ---------------------------------------------------------------------------
 146
 147 export {
 148   updateYoutubeDLBinary,
 149   downloadYoutubeDLVideo,
 150   getYoutubeDLInfo,
 151   safeGetYoutubeDL
 152 }
 153
 154 // ---------------------------------------------------------------------------
 155
 156 function normalizeObject (obj: any) {
 157   const newObj: any = {}
 158
 159   for (const key of Object.keys(obj)) {
 160     // Deprecated key
 161     if (key === 'resolution') continue
 162
 163     const value = obj[key]
 164
 165     if (typeof value === 'string') {
 166       newObj[key] = value.normalize()
 167     } else {
 168       newObj[key] = value
 169     }
 170   }
 171
 172   return newObj
 173 }
 174
 175 function buildVideoInfo (obj: any) {
 176   return {
 177     name: titleTruncation(obj.title),
 178     description: descriptionTruncation(obj.description),
 179     category: getCategory(obj.categories),
 180     licence: getLicence(obj.license),
 181     nsfw: isNSFW(obj),
 182     tags: getTags(obj.tags),
 183     thumbnailUrl: obj.thumbnail || undefined
 184   }
 185 }
 186
 187 function titleTruncation (title: string) {
 188   return truncate(title, {
 189     'length': CONSTRAINTS_FIELDS.VIDEOS.NAME.max,
 190     'separator': /,? +/,
 191     'omission': ' […]'
 192   })
 193 }
 194
 195 function descriptionTruncation (description: string) {
 196   if (!description || description.length < CONSTRAINTS_FIELDS.VIDEOS.DESCRIPTION.min) return undefined
 197
 198   return truncate(description, {
 199     'length': CONSTRAINTS_FIELDS.VIDEOS.DESCRIPTION.max,
 200     'separator': /,? +/,
 201     'omission': ' […]'
 202   })
 203 }
 204
 205 function isNSFW (info: any) {
 206   return info.age_limit && info.age_limit >= 16
 207 }
 208
 209 function getTags (tags: any) {
 210   if (Array.isArray(tags) === false) return []
 211
 212   return tags
 213     .filter(t => t.length < CONSTRAINTS_FIELDS.VIDEOS.TAG.max && t.length > CONSTRAINTS_FIELDS.VIDEOS.TAG.min)
 214     .map(t => t.normalize())
 215     .slice(0, 5)
 216 }
 217
 218 function getLicence (licence: string) {
 219   if (!licence) return undefined
 220
 221   if (licence.indexOf('Creative Commons Attribution') !== -1) return 1
 222
 223   return undefined
 224 }
 225
 226 function getCategory (categories: string[]) {
 227   if (!categories) return undefined
 228
 229   const categoryString = categories[0]
 230   if (!categoryString || typeof categoryString !== 'string') return undefined
 231
 232   if (categoryString === 'News & Politics') return 11
 233
 234   for (const key of Object.keys(VIDEO_CATEGORIES)) {
 235     const category = VIDEO_CATEGORIES[key]
 236     if (categoryString.toLowerCase() === category.toLowerCase()) return parseInt(key, 10)
 237   }
 238
 239   return undefined
 240 }