Merge branch 'develop' into cli-wrapper

diff --cc client/src/sass/application.scss
Simple merge

diff --cc package.json
index cc4f6be5ceb484f682b40ca00f6475cc000f1104,53e07a72bbdae5bcbede7481b5192ec9a285d1fc..d5cf95b83c3350ebdfc766b520e9df0fea3aae8e
--- 1/package.json
--- 2/package.json
+++ b/package.json
@@@ -116,9 -111,9 +116,10 @@@
      "jsonld-signatures": "https://github.com/Chocobozzz/jsonld-signatures#rsa2017",
      "lodash": "^4.17.10",
      "magnet-uri": "^5.1.4",
+     "memoizee": "^0.4.14",
      "morgan": "^1.5.3",
      "multer": "^1.1.0",
 +    "netrc-parser": "^3.1.6",
      "nodemailer": "^4.4.2",
      "parse-torrent": "^6.0.0",
      "password-generator": "^2.0.2",

diff --cc server/helpers/youtube-dl.ts
index 8b2bc17824f511866ffc1509dc7fa8afc71b7b43,db2bddf78cc3af8acd1beae2d016b858b8c06163..25e719cc3654d65e01ceedbfef03b96f3fd7e239
--- 1/server/helpers/youtube-dl.ts
--- 2/server/helpers/youtube-dl.ts
+++ b/server/helpers/youtube-dl.ts
@@@ -48,6 -52,74 +52,64 @@@ function downloadYoutubeDLVideo (url: s
    })
  }
  
 -// ---------------------------------------------------------------------------
 -
 -export {
 -  updateYoutubeDLBinary,
 -  downloadYoutubeDLVideo,
 -  getYoutubeDLInfo
 -}
 -
 -// ---------------------------------------------------------------------------
 -
+ // 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 binDirectory = join(root(), 'node_modules', 'youtube-dl', 'bin')
+   const bin = join(binDirectory, 'youtube-dl')
+   const detailsPath = join(binDirectory, 'details')
+   const url = 'https://yt-dl.org/downloads/latest/youtube-dl'
+ 
+   await ensureDir(binDirectory)
+ 
+   return new Promise(res => {
+     request.get(url, { followRedirect: false }, (err, result) => {
+       if (err) {
+         logger.error('Cannot update youtube-dl.', { err })
+         return res()
+       }
+ 
+       if (result.statusCode !== 302) {
+         logger.error('youtube-dl update error: did not get redirect for the latest version link. Status %d', result.statusCode)
+         return res()
+       }
+ 
+       const url = result.headers.location
+       const downloadFile = request.get(url)
+       const newVersion = /yt-dl\.org\/downloads\/(\d{4}\.\d\d\.\d\d(\.\d)?)\/youtube-dl/.exec(url)[ 1 ]
+ 
+       downloadFile.on('response', result => {
+         if (result.statusCode !== 200) {
+           logger.error('Cannot update youtube-dl: new version response is not 200, it\'s %d.', result.statusCode)
+           return res()
+         }
+ 
+         downloadFile.pipe(createWriteStream(bin, { mode: 493 }))
+       })
+ 
+       downloadFile.on('error', err => {
+         logger.error('youtube-dl update error.', { err })
+         return res()
+       })
+ 
+       downloadFile.on('end', () => {
+         const details = JSON.stringify({ version: newVersion, path: bin, exec: 'youtube-dl' })
+         writeFile(detailsPath, details, { encoding: 'utf8' }, err => {
+           if (err) {
+             logger.error('youtube-dl update error: cannot write details.', { err })
+             return res()
+           }
+ 
+           logger.info('youtube-dl updated to version %s.', newVersion)
+           return res()
+         })
+       })
+     })
+   })
+ }
+ 
  async function safeGetYoutubeDL () {
    let youtubeDL
  
@@@ -62,16 -134,6 +124,17 @@@
    return youtubeDL
  }
  
 +// ---------------------------------------------------------------------------
 +
 +export {
++  updateYoutubeDLBinary,
 +  downloadYoutubeDLVideo,
 +  getYoutubeDLInfo,
 +  safeGetYoutubeDL
 +}
 +
 +// ---------------------------------------------------------------------------
 +
  function normalizeObject (obj: any) {
    const newObj: any = {}