Authentication is broken

[ibcht]

Hi,

I encountered the issue below :

ERROR [SoundCloudBackend-9] mopidy_soundcloud.soundcloud Invalid "auth_token" used for SoundCloud authentication!

After several attempts to reissue a token from the dedicated page https://mopidy.com/ext/soundcloud, I was still unable to process to the authentication step.

It looks like there has been some changes this year (around july apparently) on the authentication process to the SoundCloud API : https://developers.soundcloud.com/blog/security-updates-api. The Authorization Code flow with a direct token requested during the authorization step is now deprecated :

Changes in Authorization Code Flow

For an authorization_code grant type, we’ll only support one response type: code. Token and code_and_token are deprecated and will be considered invalid.

Altought such tokens can still be issued, it looks like they are now unusable on the API unfortunately ...

Version tested : 3.0.1.

[kingosticks]

Duplicate of #123