1 files changed, 72 insertions, 0 deletions

diff --git a/client/src/standalone/videos/shared/playlist-fetcher.ts b/client/src/standalone/videos/shared/playlist-fetcher.ts
new file mode 100644
index 000000000..a7e72c177
--- /dev/null
+++ b/client/src/standalone/videos/shared/playlist-fetcher.ts
@@ -0,0 +1,72 @@
+import { HttpStatusCode, ResultList, VideoPlaylistElement } from '../../../../../shared/models'
+import { AuthHTTP } from './auth-http'
+
+export class PlaylistFetcher {
+
+  constructor (private readonly http: AuthHTTP) {
+
+  }
+
+  async loadPlaylist (playlistId: string) {
+    const playlistPromise = this.loadPlaylistInfo(playlistId)
+    const playlistElementsPromise = this.loadPlaylistElements(playlistId)
+
+    let playlistResponse: Response
+    let isResponseOk: boolean
+
+    try {
+      playlistResponse = await playlistPromise
+      isResponseOk = playlistResponse.status === HttpStatusCode.OK_200
+    } catch (err) {
+      console.error(err)
+      isResponseOk = false
+    }
+
+    if (!isResponseOk) {
+      if (playlistResponse?.status === HttpStatusCode.NOT_FOUND_404) {
+        throw new Error('This playlist does not exist.')
+      }
+
+      throw new Error('We cannot fetch the playlist. Please try again later.')
+    }
+
+    return { playlistResponse, videosResponse: await playlistElementsPromise }
+  }
+
+  async loadAllPlaylistVideos (playlistId: string, baseResult: ResultList<VideoPlaylistElement>) {
+    let elements = baseResult.data
+    let total = baseResult.total
+    let i = 0
+
+    while (total > elements.length && i < 10) {
+      const result = await this.loadPlaylistElements(playlistId, elements.length)
+
+      const json = await result.json()
+      total = json.total
+
+      elements = elements.concat(json.data)
+      i++
+    }
+
+    if (i === 10) {
+      console.error('Cannot fetch all playlists elements, there are too many!')
+    }
+
+    return elements
+  }
+
+  private loadPlaylistInfo (playlistId: string): Promise<Response> {
+    return this.http.fetch(this.getPlaylistUrl(playlistId), { optionalAuth: true })
+  }
+
+  private loadPlaylistElements (playlistId: string, start = 0): Promise<Response> {
+    const url = new URL(this.getPlaylistUrl(playlistId) + '/videos')
+    url.search = new URLSearchParams({ start: '' + start, count: '100' }).toString()
+
+    return this.http.fetch(url.toString(), { optionalAuth: true })
+  }
+
+  private getPlaylistUrl (id: string) {
+    return window.location.origin + '/api/v1/video-playlists/' + id
+  }
+}