Feature request: Spotify song playback/sync support?

[Avamander]

It would be nice if Cytube supported playing Spotify song links, I've seen other sites embed Spotify so it should be doable to some extent. I'm not sure about syncing however.

[Xaekai]

Their Widget:

Premium or Free
For users who are not logged in on their Spotify account, the Spotify Play button plays a 30-second long audio preview, and then the users are prompted to either login or to sign up.

Their APIs:
This already looks like a mine field of pain.

[Avamander]

I guess login makes sense, they are forced to protect the songs with DRM and stuff.

Not sure about the minefield of pain though, if I remember correctly the open-source ListenBrainz did it and it wasn't too hard.

[calzoneman]

It looks like their playback in-browser requires EME (encrypted media extensions; a form of DRM). My web browser is compiled without support for EME, so this wouldn't be something I could develop/test myself.

If someone wants to do it and submit a pull request, I'm willing to consider it if appropriate messaging/warnings are added to make the limitations and login requirements clear for users who opt-in.