Implement an OIDC-based backend for uc-cdis/fence

[VJalili]

Fence repo: https://github.com/uc-cdis/fence

TODOs:

• [ ] Fence does not support nonce (see https://github.com/uc-cdis/fence/issues/600 )---a required claim by psa (and oidc specifications)---that results in AuthTokenError exception:

  https://github.com/python-social-auth/social-core/blob/000f8e5c8b505f2215e25deebf670b708a0578f4/social_core/backends/open_id_connect.py#L134-L143

  Hence, either psa should make nonce optional (https://github.com/python-social-auth/social-core/issues/315) or Fence implement it. IMHO, based on OIDC-specs (see the following quote), the latter is preferred.

  If present in the Authentication Request, Authorization Servers MUST include a nonce Claim in the ID Token with the Claim Value being the nonce value sent in the Authentication Request. (Ref)

[stale[bot]]

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