c7d5efb796
The Video Player XBlock will sometimes make API calls to /couses/yt_video_metadata, a REST API endpoint that in turn loads video metadata from YouTube using the configured settings.YOUTUBE_API_KEY. However, in the Blockstore-based XBlock runtime, we are running XBlocks in a secure sandbox, and the user's browser cannot pass session cookies when calling REST API endpoints. So currently, the video XBlock tries to request YouTube metadata from that API endpoint, but it fails if run within such a sandbox. The existing API also doesn't work for anonymous users (users who are allowed to see video XBlocks but who have not logged in to an LMS user account). This commit updates the Video XBlock so that it can use a handler to load the data from YouTube instead of a generic REST API. This works well in the new runtime, because it has code to support calling handlers within the sandbox, including by anonymous users. I also fixed a bug where on a default devstack, the endpoint will try calling YouTube using PUT_YOUR_API_KEY_HERE as an API key, and get a "bad request" error from YouTube. The code could be re-organized by moving things around, but I've left everything as-is for now to keep the diff as small as possible.
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