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import { decode, encode } from 'bencode'
import createTorrent from 'create-torrent'
import { createWriteStream, ensureDir, readFile, remove, writeFile } from 'fs-extra'
import magnetUtil from 'magnet-uri'
import parseTorrent from 'parse-torrent'
import { dirname, join } from 'path'
import { pipeline } from 'stream'
import WebTorrent, { Instance, TorrentFile } from 'webtorrent'
import { isArray } from '@server/helpers/custom-validators/misc'
import { WEBSERVER } from '@server/initializers/constants'
import { generateTorrentFileName } from '@server/lib/paths'
import { VideoPathManager } from '@server/lib/video-path-manager'
import { MVideo } from '@server/types/models/video/video'
import { MVideoFile, MVideoFileRedundanciesOpt } from '@server/types/models/video/video-file'
import { MStreamingPlaylistVideo } from '@server/types/models/video/video-streaming-playlist'
import { CONFIG } from '../initializers/config'
import { promisify2 } from './core-utils'
import { logger } from './logger'
import { generateVideoImportTmpPath } from './utils'
import { extractVideo } from './video'
const createTorrentPromise = promisify2<string, any, any>(createTorrent)
async function downloadWebTorrentVideo (target: { magnetUri: string, torrentName?: string }, timeout: number) {
const id = target.magnetUri || target.torrentName
let timer
const path = generateVideoImportTmpPath(id)
logger.info('Importing torrent video %s', id)
const directoryPath = join(CONFIG.STORAGE.TMP_DIR, 'webtorrent')
await ensureDir(directoryPath)
return new Promise<string>((res, rej) => {
const webtorrent = new WebTorrent()
let file: TorrentFile
const torrentId = target.magnetUri || join(CONFIG.STORAGE.TORRENTS_DIR, target.torrentName)
const options = { path: directoryPath }
const torrent = webtorrent.add(torrentId, options, torrent => {
if (torrent.files.length !== 1) {
if (timer) clearTimeout(timer)
for (const file of torrent.files) {
deleteDownloadedFile({ directoryPath, filepath: file.path })
}
return safeWebtorrentDestroy(webtorrent, torrentId, undefined, target.torrentName)
.then(() => rej(new Error('Cannot import torrent ' + torrentId + ': there are multiple files in it')))
}
logger.debug('Got torrent from webtorrent %s.', id, { infoHash: torrent.infoHash })
file = torrent.files[0]
// FIXME: avoid creating another stream when https://github.com/webtorrent/webtorrent/issues/1517 is fixed
const writeStream = createWriteStream(path)
writeStream.on('finish', () => {
if (timer) clearTimeout(timer)
safeWebtorrentDestroy(webtorrent, torrentId, { directoryPath, filepath: file.path }, target.torrentName)
.then(() => res(path))
.catch(err => logger.error('Cannot destroy webtorrent.', { err }))
})
pipeline(
file.createReadStream(),
writeStream,
err => {
if (err) rej(err)
}
)
})
torrent.on('error', err => rej(err))
timer = setTimeout(() => {
const err = new Error('Webtorrent download timeout.')
safeWebtorrentDestroy(webtorrent, torrentId, file ? { directoryPath, filepath: file.path } : undefined, target.torrentName)
.then(() => rej(err))
.catch(destroyErr => {
logger.error('Cannot destroy webtorrent.', { err: destroyErr })
rej(err)
})
}, timeout)
})
}
function createTorrentAndSetInfoHash (videoOrPlaylist: MVideo | MStreamingPlaylistVideo, videoFile: MVideoFile) {
const video = extractVideo(videoOrPlaylist)
const options = {
// Keep the extname, it's used by the client to stream the file inside a web browser
name: `${video.name} ${videoFile.resolution}p${videoFile.extname}`,
createdBy: 'PeerTube',
announceList: buildAnnounceList(),
urlList: buildUrlList(video, videoFile)
}
return VideoPathManager.Instance.makeAvailableVideoFile(videoOrPlaylist, videoFile, async videoPath => {
const torrentContent = await createTorrentPromise(videoPath, options)
const torrentFilename = generateTorrentFileName(videoOrPlaylist, videoFile.resolution)
const torrentPath = join(CONFIG.STORAGE.TORRENTS_DIR, torrentFilename)
logger.info('Creating torrent %s.', torrentPath)
await writeFile(torrentPath, torrentContent)
// Remove old torrent file if it existed
if (videoFile.hasTorrent()) {
await remove(join(CONFIG.STORAGE.TORRENTS_DIR, videoFile.torrentFilename))
}
const parsedTorrent = parseTorrent(torrentContent)
videoFile.infoHash = parsedTorrent.infoHash
videoFile.torrentFilename = torrentFilename
})
}
async function updateTorrentUrls (videoOrPlaylist: MVideo | MStreamingPlaylistVideo, videoFile: MVideoFile) {
const video = extractVideo(videoOrPlaylist)
const oldTorrentPath = join(CONFIG.STORAGE.TORRENTS_DIR, videoFile.torrentFilename)
const torrentContent = await readFile(oldTorrentPath)
const decoded = decode(torrentContent)
decoded['announce-list'] = buildAnnounceList()
decoded.announce = decoded['announce-list'][0][0]
decoded['url-list'] = buildUrlList(video, videoFile)
const newTorrentFilename = generateTorrentFileName(videoOrPlaylist, videoFile.resolution)
const newTorrentPath = join(CONFIG.STORAGE.TORRENTS_DIR, newTorrentFilename)
logger.info('Updating torrent URLs %s -> %s.', oldTorrentPath, newTorrentPath)
await writeFile(newTorrentPath, encode(decoded))
await remove(join(CONFIG.STORAGE.TORRENTS_DIR, videoFile.torrentFilename))
videoFile.torrentFilename = newTorrentFilename
}
function generateMagnetUri (
video: MVideo,
videoFile: MVideoFileRedundanciesOpt,
trackerUrls: string[]
) {
const xs = videoFile.getTorrentUrl()
const announce = trackerUrls
let urlList = [ videoFile.getFileUrl(video) ]
const redundancies = videoFile.RedundancyVideos
if (isArray(redundancies)) urlList = urlList.concat(redundancies.map(r => r.fileUrl))
const magnetHash = {
xs,
announce,
urlList,
infoHash: videoFile.infoHash,
name: video.name
}
return magnetUtil.encode(magnetHash)
}
// ---------------------------------------------------------------------------
export {
createTorrentPromise,
updateTorrentUrls,
createTorrentAndSetInfoHash,
generateMagnetUri,
downloadWebTorrentVideo
}
// ---------------------------------------------------------------------------
function safeWebtorrentDestroy (
webtorrent: Instance,
torrentId: string,
downloadedFile?: { directoryPath: string, filepath: string },
torrentName?: string
) {
return new Promise<void>(res => {
webtorrent.destroy(err => {
// Delete torrent file
if (torrentName) {
logger.debug('Removing %s torrent after webtorrent download.', torrentId)
remove(torrentId)
.catch(err => logger.error('Cannot remove torrent %s in webtorrent download.', torrentId, { err }))
}
// Delete downloaded file
if (downloadedFile) deleteDownloadedFile(downloadedFile)
if (err) logger.warn('Cannot destroy webtorrent in timeout.', { err })
return res()
})
})
}
function deleteDownloadedFile (downloadedFile: { directoryPath: string, filepath: string }) {
// We want to delete the base directory
let pathToDelete = dirname(downloadedFile.filepath)
if (pathToDelete === '.') pathToDelete = downloadedFile.filepath
const toRemovePath = join(downloadedFile.directoryPath, pathToDelete)
logger.debug('Removing %s after webtorrent download.', toRemovePath)
remove(toRemovePath)
.catch(err => logger.error('Cannot remove torrent file %s in webtorrent download.', toRemovePath, { err }))
}
function buildAnnounceList () {
return [
[ WEBSERVER.WS + '://' + WEBSERVER.HOSTNAME + ':' + WEBSERVER.PORT + '/tracker/socket' ],
[ WEBSERVER.URL + '/tracker/announce' ]
]
}
function buildUrlList (video: MVideo, videoFile: MVideoFile) {
return [ videoFile.getFileUrl(video) ]
}
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