1 files changed, 164 insertions, 0 deletions

diff --git a/server/lib/hls.ts b/server/lib/hls.ts
new file mode 100644
index 000000000..3575981f4
--- /dev/null
+++ b/server/lib/hls.ts
@@ -0,0 +1,164 @@
+import { VideoModel } from '../models/video/video'
+import { basename, join, dirname } from 'path'
+import { CONFIG, HLS_PLAYLIST_DIRECTORY } from '../initializers'
+import { close, ensureDir, move, open, outputJSON, pathExists, read, readFile, remove, writeFile } from 'fs-extra'
+import { getVideoFileSize } from '../helpers/ffmpeg-utils'
+import { sha256 } from '../helpers/core-utils'
+import { VideoStreamingPlaylistModel } from '../models/video/video-streaming-playlist'
+import { logger } from '../helpers/logger'
+import { doRequest, doRequestAndSaveToFile } from '../helpers/requests'
+import { generateRandomString } from '../helpers/utils'
+import { flatten, uniq } from 'lodash'
+
+async function updateMasterHLSPlaylist (video: VideoModel) {
+  const directory = join(HLS_PLAYLIST_DIRECTORY, video.uuid)
+  const masterPlaylists: string[] = [ '#EXTM3U', '#EXT-X-VERSION:3' ]
+  const masterPlaylistPath = join(directory, VideoStreamingPlaylistModel.getMasterHlsPlaylistFilename())
+
+  for (const file of video.VideoFiles) {
+    // If we did not generated a playlist for this resolution, skip
+    const filePlaylistPath = join(directory, VideoStreamingPlaylistModel.getHlsPlaylistFilename(file.resolution))
+    if (await pathExists(filePlaylistPath) === false) continue
+
+    const videoFilePath = video.getVideoFilePath(file)
+
+    const size = await getVideoFileSize(videoFilePath)
+
+    const bandwidth = 'BANDWIDTH=' + video.getBandwidthBits(file)
+    const resolution = `RESOLUTION=${size.width}x${size.height}`
+
+    let line = `#EXT-X-STREAM-INF:${bandwidth},${resolution}`
+    if (file.fps) line += ',FRAME-RATE=' + file.fps
+
+    masterPlaylists.push(line)
+    masterPlaylists.push(VideoStreamingPlaylistModel.getHlsPlaylistFilename(file.resolution))
+  }
+
+  await writeFile(masterPlaylistPath, masterPlaylists.join('\n') + '\n')
+}
+
+async function updateSha256Segments (video: VideoModel) {
+  const json: { [filename: string]: { [range: string]: string } } = {}
+
+  const playlistDirectory = join(HLS_PLAYLIST_DIRECTORY, video.uuid)
+
+  // For all the resolutions available for this video
+  for (const file of video.VideoFiles) {
+    const rangeHashes: { [range: string]: string } = {}
+
+    const videoPath = join(playlistDirectory, VideoStreamingPlaylistModel.getHlsVideoName(video.uuid, file.resolution))
+    const playlistPath = join(playlistDirectory, VideoStreamingPlaylistModel.getHlsPlaylistFilename(file.resolution))
+
+    // Maybe the playlist is not generated for this resolution yet
+    if (!await pathExists(playlistPath)) continue
+
+    const playlistContent = await readFile(playlistPath)
+    const ranges = getRangesFromPlaylist(playlistContent.toString())
+
+    const fd = await open(videoPath, 'r')
+    for (const range of ranges) {
+      const buf = Buffer.alloc(range.length)
+      await read(fd, buf, 0, range.length, range.offset)
+
+      rangeHashes[`${range.offset}-${range.offset + range.length - 1}`] = sha256(buf)
+    }
+    await close(fd)
+
+    const videoFilename = VideoStreamingPlaylistModel.getHlsVideoName(video.uuid, file.resolution)
+    json[videoFilename] = rangeHashes
+  }
+
+  const outputPath = join(playlistDirectory, VideoStreamingPlaylistModel.getHlsSha256SegmentsFilename())
+  await outputJSON(outputPath, json)
+}
+
+function getRangesFromPlaylist (playlistContent: string) {
+  const ranges: { offset: number, length: number }[] = []
+  const lines = playlistContent.split('\n')
+  const regex = /^#EXT-X-BYTERANGE:(\d+)@(\d+)$/
+
+  for (const line of lines) {
+    const captured = regex.exec(line)
+
+    if (captured) {
+      ranges.push({ length: parseInt(captured[1], 10), offset: parseInt(captured[2], 10) })
+    }
+  }
+
+  return ranges
+}
+
+function downloadPlaylistSegments (playlistUrl: string, destinationDir: string, timeout: number) {
+  let timer
+
+  logger.info('Importing HLS playlist %s', playlistUrl)
+
+  return new Promise<string>(async (res, rej) => {
+    const tmpDirectory = join(CONFIG.STORAGE.TMP_DIR, await generateRandomString(10))
+
+    await ensureDir(tmpDirectory)
+
+    timer = setTimeout(() => {
+      deleteTmpDirectory(tmpDirectory)
+
+      return rej(new Error('HLS download timeout.'))
+    }, timeout)
+
+    try {
+      // Fetch master playlist
+      const subPlaylistUrls = await fetchUniqUrls(playlistUrl)
+
+      const subRequests = subPlaylistUrls.map(u => fetchUniqUrls(u))
+      const fileUrls = uniq(flatten(await Promise.all(subRequests)))
+
+      logger.debug('Will download %d HLS files.', fileUrls.length, { fileUrls })
+
+      for (const fileUrl of fileUrls) {
+        const destPath = join(tmpDirectory, basename(fileUrl))
+
+        await doRequestAndSaveToFile({ uri: fileUrl }, destPath)
+      }
+
+      clearTimeout(timer)
+
+      await move(tmpDirectory, destinationDir, { overwrite: true })
+
+      return res()
+    } catch (err) {
+      deleteTmpDirectory(tmpDirectory)
+
+      return rej(err)
+    }
+  })
+
+  function deleteTmpDirectory (directory: string) {
+    remove(directory)
+      .catch(err => logger.error('Cannot delete path on HLS download error.', { err }))
+  }
+
+  async function fetchUniqUrls (playlistUrl: string) {
+    const { body } = await doRequest<string>({ uri: playlistUrl })
+
+    if (!body) return []
+
+    const urls = body.split('\n')
+      .filter(line => line.endsWith('.m3u8') || line.endsWith('.mp4'))
+      .map(url => {
+        if (url.startsWith('http://') || url.startsWith('https://')) return url
+
+        return `${dirname(playlistUrl)}/${url}`
+      })
+
+    return uniq(urls)
+  }
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  updateMasterHLSPlaylist,
+  updateSha256Segments,
+  downloadPlaylistSegments
+}
+
+// ---------------------------------------------------------------------------