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 { YoutubeDlUpdateScheduler } from '../lib/schedulers/youtube-dl-update-scheduler'
   6
   7 export type YoutubeDLInfo = {
   8   name?: string
   9   description?: string
  10   category?: number
  11   licence?: number
  12   nsfw?: boolean
  13   tags?: string[]
  14   thumbnailUrl?: string
  15 }
  16
  17 function getYoutubeDLInfo (url: string): Promise<YoutubeDLInfo> {
  18   return new Promise<YoutubeDLInfo>(async (res, rej) => {
  19     const options = [ '-j', '--flat-playlist' ]
  20
  21     const youtubeDL = await safeGetYoutubeDL()
  22     youtubeDL.getInfo(url, options, (err, info) => {
  23       if (err) return rej(err)
  24       if (info.is_live === true) return rej(new Error('Cannot download a live streaming.'))
  25
  26       const obj = buildVideoInfo(normalizeObject(info))
  27       if (obj.name && obj.name.length < CONSTRAINTS_FIELDS.VIDEOS.NAME.min) obj.name += ' video'
  28
  29       return res(obj)
  30     })
  31   })
  32 }
  33
  34 function downloadYoutubeDLVideo (url: string) {
  35   const path = generateVideoTmpPath(url)
  36
  37   logger.info('Importing youtubeDL video %s', url)
  38
  39   const options = [ '-f', 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best', '-o', path ]
  40
  41   return new Promise<string>(async (res, rej) => {
  42     const youtubeDL = await safeGetYoutubeDL()
  43     youtubeDL.exec(url, options, async (err, output) => {
  44       if (err) return rej(err)
  45
  46       return res(path)
  47     })
  48   })
  49 }
  50
  51 // ---------------------------------------------------------------------------
  52
  53 export {
  54   downloadYoutubeDLVideo,
  55   getYoutubeDLInfo
  56 }
  57
  58 // ---------------------------------------------------------------------------
  59
  60 async function safeGetYoutubeDL () {
  61   let youtubeDL
  62
  63   try {
  64     youtubeDL = require('youtube-dl')
  65   } catch (e) {
  66     // Download binary
  67     await YoutubeDlUpdateScheduler.Instance.execute()
  68     youtubeDL = require('youtube-dl')
  69   }
  70
  71   return youtubeDL
  72 }
  73
  74 function normalizeObject (obj: any) {
  75   const newObj: any = {}
  76
  77   for (const key of Object.keys(obj)) {
  78     // Deprecated key
  79     if (key === 'resolution') continue
  80
  81     const value = obj[key]
  82
  83     if (typeof value === 'string') {
  84       newObj[key] = value.normalize()
  85     } else {
  86       newObj[key] = value
  87     }
  88   }
  89
  90   return newObj
  91 }
  92
  93 function buildVideoInfo (obj: any) {
  94   return {
  95     name: titleTruncation(obj.title),
  96     description: descriptionTruncation(obj.description),
  97     category: getCategory(obj.categories),
  98     licence: getLicence(obj.license),
  99     nsfw: isNSFW(obj),
 100     tags: getTags(obj.tags),
 101     thumbnailUrl: obj.thumbnail || undefined
 102   }
 103 }
 104
 105 function titleTruncation (title: string) {
 106   return truncate(title, {
 107     'length': CONSTRAINTS_FIELDS.VIDEOS.NAME.max,
 108     'separator': /,? +/,
 109     'omission': ' […]'
 110   })
 111 }
 112
 113 function descriptionTruncation (description: string) {
 114   if (!description || description.length < CONSTRAINTS_FIELDS.VIDEOS.DESCRIPTION.min) return undefined
 115
 116   return truncate(description, {
 117     'length': CONSTRAINTS_FIELDS.VIDEOS.DESCRIPTION.max,
 118     'separator': /,? +/,
 119     'omission': ' […]'
 120   })
 121 }
 122
 123 function isNSFW (info: any) {
 124   return info.age_limit && info.age_limit >= 16
 125 }
 126
 127 function getTags (tags: any) {
 128   if (Array.isArray(tags) === false) return []
 129
 130   return tags
 131     .filter(t => t.length < CONSTRAINTS_FIELDS.VIDEOS.TAG.max && t.length > CONSTRAINTS_FIELDS.VIDEOS.TAG.min)
 132     .map(t => t.normalize())
 133     .slice(0, 5)
 134 }
 135
 136 function getLicence (licence: string) {
 137   if (!licence) return undefined
 138
 139   if (licence.indexOf('Creative Commons Attribution') !== -1) return 1
 140
 141   return undefined
 142 }
 143
 144 function getCategory (categories: string[]) {
 145   if (!categories) return undefined
 146
 147   const categoryString = categories[0]
 148   if (!categoryString || typeof categoryString !== 'string') return undefined
 149
 150   if (categoryString === 'News & Politics') return 11
 151
 152   for (const key of Object.keys(VIDEO_CATEGORIES)) {
 153     const category = VIDEO_CATEGORIES[key]
 154     if (categoryString.toLowerCase() === category.toLowerCase()) return parseInt(key, 10)
 155   }
 156
 157   return undefined
 158 }