Detect and properly error on DRM protected videos

[absidue]

Detect and properly error on DRM protected videos

Pull Request Type

• Bugfix

Related issue

• closes [Bug]: YouTube Movies cannot be played #6346

Description

DRM protected videos cannot be played in FreeTube as that requires the proprietary, closed source Widevine CDM and a VMP signed build of Electron, both things which are understandably not included in the standard open source Electron builds. This pull request adds support for FreeTube to detect such videos and show a user friendly message (instead of it attempting and failing to play the DRM protected content).

Unfortunately the movie trailers are unlisted videos, so we can't just find the trailer some other way if it isn't included in the API response like they are for movies that are not free with ads.

Screenshots

Testing

1. Find a free with ads movie (e.g. https://youtu.be/3fE5uTeBGUM in the US, provided in the linked issue)
2. Visit the page on the local API, you should see the same message as in the screenshot

Desktop

• OS: Windows
• OS Version: 10
• FreeTube version: c7c6dfd

[kommunarr]

thought (non-blocking, future): I'd like it if there were click-to-copy and/or open-in-browser links that appeared for these types of error popups where the appropriate action is often to open first-party.