Allow using payload instead of userinfo to map claims for users

[stevenbal]

Currently, claims can only be mapped with the userinfo, but it would be nice if there was an option to use the payload / id_token.

The get_userinfo function from mozilla-django-oidc can be overridden to make this possible: https://github.com/mozilla/mozilla-django-oidc/blob/main/mozilla_django_oidc/auth.py#L235.

This could also be a difference between OIDC v1 and v2, so that should probably be looked into first

• https://devblogs.microsoft.com/premier-developer/azure-ad-endpoint-v1-vs-v2/