This is unlikely to be part of this project, but anyone looking for ideas or a small project is welcome to contribute an implementation.

I found UnTube¹ which was a playlist manager, so it likely has most of what this would need already coded.

Requires

• access to a YouTube account

Provides

• a suitable cookies file for yt-dlp to use
• a listing of available playlists in the YouTube account
• the playlist ID, title, last modified timestamp, and creator ID for every playlist that is available
• the ID, description, title, availability and timestamp for every media in a playlist
• a listing of subscriptions from the account including the channel ID

Based on this comment:

It would be great if TubeSync could implement the YouTube API and call the /subscriptions method to "sync" the user's subscriptions periodically (like once an hour or something)

Originally posted by @derekantrican in #245

More resources:

• https://developers.google.com/youtube/v3/guides/auth/server-side-web-apps
• https://developers.google.com/youtube/v3/docs/subscriptions/list?apix_params=%7B%22part%22%3A%5B%22contentDetails%22%5D%2C%22mine%22%3Atrue%7D