Support lazy download thumbnails

server/lib/files-cache/video-storyboards-simple-file-cache.ts

@@ -0,0 +1,53 @@
+import { join } from 'path'
+import { logger } from '@server/helpers/logger'
+import { doRequestAndSaveToFile } from '@server/helpers/requests'
+import { StoryboardModel } from '@server/models/video/storyboard'
+import { FILES_CACHE } from '../../initializers/constants'
+import { AbstractSimpleFileCache } from './shared/abstract-simple-file-cache'
+
+class VideoStoryboardsSimpleFileCache extends AbstractSimpleFileCache <string> {
+
+  private static instance: VideoStoryboardsSimpleFileCache
+
+  private constructor () {
+    super()
+  }
+
+  static get Instance () {
+    return this.instance || (this.instance = new this())
+  }
+
+  async getFilePathImpl (filename: string) {
+    const storyboard = await StoryboardModel.loadWithVideoByFilename(filename)
+    if (!storyboard) return undefined
+
+    if (storyboard.Video.isOwned()) return { isOwned: true, path: storyboard.getPath() }
+
+    return this.loadRemoteFile(storyboard.filename)
+  }
+
+  // Key is the storyboard filename
+  protected async loadRemoteFile (key: string) {
+    const storyboard = await StoryboardModel.loadWithVideoByFilename(key)
+    if (!storyboard) return undefined
+
+    const destPath = join(FILES_CACHE.STORYBOARDS.DIRECTORY, storyboard.filename)
+    const remoteUrl = storyboard.getOriginFileUrl(storyboard.Video)
+
+    try {
+      await doRequestAndSaveToFile(remoteUrl, destPath)
+
+      logger.debug('Fetched remote storyboard %s to %s.', remoteUrl, destPath)
+
+      return { isOwned: false, path: destPath }
+    } catch (err) {
+      logger.info('Cannot fetch remote storyboard file %s.', remoteUrl, { err })
+
+      return undefined
+    }
+  }
+}
+
+export {
+  VideoStoryboardsSimpleFileCache
+}