no function clause matching in :lists.usort/2

[maennchen]

Discussed in #279

^{Originally posted by DnOberon October 17, 2023}
Hello it's me again!

Trying to create redirect URL gives me this error - using the config gleaned from this (if you can reach it https://identity-preview.inl.gov/.well-known/openid-configuration)

[error] GenServer #PID<0.528.0> terminating
** (FunctionClauseError) no function clause matching in :lists.usort/2
    (stdlib 5.0.2) lists.erl:1259: :lists.usort(#Function<1.25876173/2 in :oidcc_authorization.deprioritize_none_alg/1>, :undefined)
    (oidcc 3.0.1) src/oidcc_authorization.erl:233: :oidcc_authorization.attempt_request_object/2
    (oidcc 3.0.1) src/oidcc_authorization.erl:83: :oidcc_authorization.create_redirect_url/2

I've verified my context is being pulled in correctly, and can give the  dbg output of that on request. 

    {:ok, context} =
      Oidcc.ClientContext.from_configuration_worker(
        Ingest.Application.OneID,
        config[:client_id],
        config[:client_secret]
      )

    dbg(
      Oidcc.Authorization.create_redirect_url(context, %{
        redirect_uri: "http://localhost:4000/users/log_in"
      })
    )

On the latest version.

[maennchen]

This is an internal bug. Values are read from the metadata. It crashes if they’re not defined even though they’re optional.