1 files changed, 53 insertions, 0 deletions

diff --git a/server/lib/files-cache/videos-caption-cache.ts b/server/lib/files-cache/videos-caption-cache.ts
new file mode 100644
index 000000000..fe5b441af
--- /dev/null
+++ b/server/lib/files-cache/videos-caption-cache.ts
@@ -0,0 +1,53 @@
+import { join } from 'path'
+import { FILES_CACHE, CONFIG } from '../../initializers'
+import { VideoModel } from '../../models/video/video'
+import { VideoCaptionModel } from '../../models/video/video-caption'
+import { AbstractVideoStaticFileCache } from './abstract-video-static-file-cache'
+
+type GetPathParam = { videoId: string, language: string }
+
+class VideosCaptionCache extends AbstractVideoStaticFileCache <GetPathParam> {
+
+  private static readonly KEY_DELIMITER = '%'
+  private static instance: VideosCaptionCache
+
+  private constructor () {
+    super()
+  }
+
+  static get Instance () {
+    return this.instance || (this.instance = new this())
+  }
+
+  async getFilePath (params: GetPathParam) {
+    const videoCaption = await VideoCaptionModel.loadByVideoIdAndLanguage(params.videoId, params.language)
+    if (!videoCaption) return undefined
+
+    if (videoCaption.isOwned()) return join(CONFIG.STORAGE.CAPTIONS_DIR, videoCaption.getCaptionName())
+
+    const key = params.videoId + VideosCaptionCache.KEY_DELIMITER + params.language
+    return this.loadFromLRU(key)
+  }
+
+  protected async loadRemoteFile (key: string) {
+    const [ videoId, language ] = key.split(VideosCaptionCache.KEY_DELIMITER)
+
+    const videoCaption = await VideoCaptionModel.loadByVideoIdAndLanguage(videoId, language)
+    if (!videoCaption) return undefined
+
+    if (videoCaption.isOwned()) throw new Error('Cannot load remote caption of owned video.')
+
+    // Used to fetch the path
+    const video = await VideoModel.loadAndPopulateAccountAndServerAndTags(videoId)
+    if (!video) return undefined
+
+    const remoteStaticPath = videoCaption.getCaptionStaticPath()
+    const destPath = join(FILES_CACHE.VIDEO_CAPTIONS.DIRECTORY, videoCaption.getCaptionName())
+
+    return this.saveRemoteVideoFileAndReturnPath(video, remoteStaticPath, destPath)
+  }
+}
+
+export {
+  VideosCaptionCache
+}