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I noticed that the library was missing the ability to use any refresh token issued by the provider.
It can be used in place of a silent user re-authentication (which does not work for the provider I was working with).
Information can be found here.
Now, while the implementation in this pull request works, it misses a proper provider response validation as described in the OpenID Specs.
That would require a serious refactoring in order to store extra information from the original response in a safer place than the user session, like the database, which currently isn't involved at all.
Plus, the validation should be factored out from the OIDCAuthenticationBackend to be re-used wherever needed.
Is there any interest in such contribution?