Fix OAuth + fix OAuth documentation + undocument logout button

[Wauplin]

2 things in this PR:

1. Fix using gr.LogoutButton breaks app #7695. The snippet example in the OAuth docs is not complete, resulting in a runtime error when running it. I forgot from huggingface_hub import whoami and demo.launch(). This is now fixed and I've been able to run it both locally and in a Space. I also took the opportunity to remove mentions to gr.LogoutButton from the docs (deprecated in Single oauth button #7063).
2. There seem to be a major bug that broke all OAuth apps on the latest version of gradio. For some reason, now request.session is not a dictionary anymore but a Obj object that mimics it. The Obj class has been added 6 months ago but the bug is for sure much more recent. Can it be related to Allow mounted Gradio apps to work with external / arbitrary authentication providers #7557 cc @abidlabs? In any case, I've added a get method to Obj which solved the issue.

I think that once this PR is merged, we should make a follow-up release given that it affects all oauth apps running on the latest version of Gradio 😕

cc @pngwn who pinged me on this.

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Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/6ef5b2640fbdc37510fa11eed1b0f00875fdaf32/gradio-4.21.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@6ef5b2640fbdc37510fa11eed1b0f00875fdaf32#subdirectory=client/python"

[gradio-pr-bot]

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Fix OAuth + fix OAuth documentation + undocument logout button

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[abidlabs]

Thanks @Wauplin for this PR! Taking a look now

There seem to be a major bug that broke all OAuth apps on the latest version of gradio. For some reason, now request.session is not a dictionary anymore but a Obj object that mimics it. The Obj class has been added 6 months ago but the bug is for sure much more recent. Can it be related to #7557 cc @abidlabs? In any case, I've added a get method to Obj which solved the issue.

That's really strange. I don't think #7557 should have affected request.session in any way. As you said, the Obj class was introduced a long time ago and it should generally just operate like a dictionary. I'll see if I can trace the regression.

[abidlabs]

@Wauplin are you sure that OAuth was broken? I just tested here with the version on main and it seems to be working fine: https://huggingface.co/spaces/abidlabs/oauth_test3

[abidlabs]

Trying to understand if we need this? Where do we call .get() on the request object? Note that we already have a __getitem__ which should provide a basic way to let this class be used as a dictionary

[Wauplin]

(see #7697 (comment))

[abidlabs]

@Wauplin this PR looks good and I've confirmed that OAuth continues to work: https://huggingface.co/spaces/abidlabs/oauth_test4

That being said, I can't repro OAuth being broken in the first place. Would be good to clarify that before merging in.

[Wauplin]

@abidlabs here is an example running on Gradio 4.21.0: https://huggingface.co/spaces/Wauplin/tmp_test_oauth. I'm getting an error when Gradio internals try to get oauth information from request.session that is no longer a dict but an Obj:

Here is the traceback that helped me debug it:

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/gradio/queueing.py", line 501, in call_prediction
    output = await route_utils.call_process_api(
  File "/usr/local/lib/python3.10/site-packages/gradio/route_utils.py", line 253, in call_process_api
    output = await app.get_blocks().process_api(
  File "/usr/local/lib/python3.10/site-packages/gradio/blocks.py", line 1695, in process_api
    result = await self.call_function(
  File "/usr/local/lib/python3.10/site-packages/gradio/blocks.py", line 1221, in call_function
    processed_input, progress_index, _ = special_args(
  File "/usr/local/lib/python3.10/site-packages/gradio/helpers.py", line 792, in special_args
    oauth_info = session.get("oauth_info", None)
AttributeError: 'Obj' object has no attribute 'get'

By a quick git blame, it looks like this line has been updated here (in #7495, 3 weeks ago).
Adding get method in Obj solves the problem (sorry not mentioning it in the first place in this PR 😬)

[abidlabs]

Ah that explains it. We refactored this assuming that request.session is a dictionary. Nice catch @Wauplin and thanks for explaining. We'll get a release out soon.

[Wauplin]

I was also expecting it to be a dictionary 😁