The url used by the GoogleOpenId backend seems to be deprecated

[JoseKilo]

The url used by the GoogleOpenId backend seems to be deprecated:
https://github.com/python-social-auth/social-core/blob/master/social_core/backends/google.py#L176

If you try to access https://www.google.com/accounts/o8/id a 404 is returned.

Expected behaviour

Probably GoogleOpenId needs to be removed and the docs updated.

Actual behaviour

An error is returned when this backend is used.

What are the steps to reproduce this issue?

1. Configure a project with:

AUTHENTICATION_BACKENDS = (
    ...
    'social_core.backends.google.GoogleOpenId',
    ...
)

2. Try to access http://127.0.0.1:8000/auth/login/google/
3. A 500 response is returned.

Any logs, error output, etc?

The stack trace of the error:

Traceback (most recent call last):
  File "/home/jose/workspace/project/.venv/lib/python3.8/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/jose/workspace/project/.venv/lib/python3.8/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/jose/workspace/project/.venv/lib/python3.8/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/jose/workspace/project/.venv/lib/python3.8/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/home/jose/workspace/project/.venv/lib/python3.8/site-packages/social_django/utils.py", line 49, in wrapper
    return func(request, backend, *args, **kwargs)
  File "/home/jose/workspace/project/.venv/lib/python3.8/site-packages/social_django/views.py", line 23, in auth
    return do_auth(request.backend, redirect_name=REDIRECT_FIELD_NAME)
  File "/home/jose/workspace/project/.venv/lib/python3.8/site-packages/social_core/actions.py", line 29, in do_auth
    return backend.start()
  File "/home/jose/workspace/project/.venv/lib/python3.8/site-packages/social_core/backends/base.py", line 34, in start
    if self.uses_redirect():
  File "/home/jose/workspace/project/.venv/lib/python3.8/site-packages/social_core/backends/open_id.py", line 242, in uses_redirect
    return self.openid_request().shouldSendRedirect()
  File "/home/jose/workspace/project/.venv/lib/python3.8/site-packages/social_core/backends/open_id.py", line 249, in openid_request
    return self.consumer().begin(url_add_parameters(self.openid_url(),
social_core.exceptions.AuthException: OpenID discovery error: HTTP Response status from identity URL host is not 200. Got status 404
[04/Jun/2020 14:18:14] "GET /auth/login/google/ HTTP/1.1" 500 123261

Any other comments?

It looks like the recommended approach is to use "OpenID Connect" instead of the old endpoint, which is what social_core.backends.google_openidconnect.GoogleOpenIdConnect does.

Related open issue in the docs repo: python-social-auth/social-docs#65

[stale]

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