Using an OAuth source that doesn't exactly follow the OAuth specification

[Telmo26]

Describe the bug
Hello, I want to use an external OAuth2 client as a source in Authentik, as this client doesn't provide the necessary scopes for other applications and I wanted to use Authentik's property bindings to solve this issue. However, I ran into the issue below while trying to import it : it seems as though the response token doesn't contain the "token_type" field.

To Reproduce
Unique to my case and my OAuth2 provider

Expected behavior
I would like to know if there's anything that I can do to make it work.

Logs

Stacktrace from authentik

Traceback (most recent call last):
  File "/ak-root/venv/lib/python3.12/site-packages/asgiref/sync.py", line 518, in thread_handler
    raise exc_info[1]
  File "/ak-root/venv/lib/python3.12/site-packages/django/core/handlers/base.py", line 253, in _get_response_async
    response = await wrapped_callback(
               ^^^^^^^^^^^^^^^^^^^^^^^
  File "/ak-root/venv/lib/python3.12/site-packages/asgiref/sync.py", line 468, in __call__
    ret = await asyncio.shield(exec_coro)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/ak-root/venv/lib/python3.12/site-packages/asgiref/current_thread_executor.py", line 40, in run
    result = self.fn(*self.args, **self.kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/ak-root/venv/lib/python3.12/site-packages/asgiref/sync.py", line 522, in thread_handler
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/ak-root/venv/lib/python3.12/site-packages/django/views/generic/base.py", line 104, in view
    return self.dispatch(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/ak-root/venv/lib/python3.12/site-packages/django/utils/decorators.py", line 48, in _wrapper
    return bound_method(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/ak-root/venv/lib/python3.12/site-packages/django/views/decorators/csrf.py", line 65, in _view_wrapper
    return view_func(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/authentik/sources/oauth/views/dispatcher.py", line 26, in dispatch
    return view.as_view()(*args, source_slug=source_slug, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/ak-root/venv/lib/python3.12/site-packages/django/views/generic/base.py", line 104, in view
    return self.dispatch(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/authentik/sources/oauth/views/callback.py", line 47, in dispatch
    raw_info = client.get_profile_info(self.token)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/authentik/sources/oauth/clients/oauth2.py", line 150, in get_profile_info
    headers={"Authorization": f"{token['token_type']} {token['access_token']}"},
                                 ~~~~~^^^^^^^^^^^^^^
builtins.KeyError: 'token_type'

Version and Deployment (please complete the following information):

• authentik version: 2024.4.2
• Deployment: docker-compose

Additional context
The OAuth2 provider is a student association and I already told them about the issue, but they have a reputation of not tackling even the small issues, and this is a big one so I don't expect a resolution on their side anytime soon.

[authentik-automation]

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