Disable local authentication and enable OIDC auto-redirect

[Skillkiller]

Implementation of #897

Closes #897

[Skillkiller]

Hello @muety,
While developing this PR, I noticed that the CI is not running on my checked-out master. Can you take a look at the problem? The last CI runs on your repository were successful, so I don't understand the discrepancy.
To start the CI, I added an empty commit (38871eb) to the master branch.
master...skillkiller:wakapi:38871ebc80aff90e5295a1c8b3412f16fd83331a

Here are the logs from my CI execution:
https://github.com/Skillkiller/wakapi/actions/runs/20864698795

[muety]

CI is fixed 👍

[muety]

You may add a check to the PostSignup() view as well, probably right next to where AllowSignup is already being checked anyway.

Apart from that, your code looks good! 👍

Please add a view basic tests and let me know once this is ready for final review.

[Skillkiller]

Hi @muety,

I believe I have finished the implementation. Please take another look at the changes; I have also implemented your suggested code changes.

I've added unit tests for the following scenarios:

• Get Login Page: Local login only
• Get Login Page: Local auth and one OIDC provider
• Get Login Page: One OIDC provider (direct redirect)
• Get Login Page: Local auth and two OIDC providers
• Get Login Page: No auth method
• Post Login: Disabled local auth
• Post Signup: Disabled local auth

Could you please verify if the unit tests are implemented correctly, especially regarding the configuration changes within the tests? My understanding is that the configuration is reset for each test. If that is not the case, please let me know, and I will revise the tests accordingly.

To make testing this PR easier, I have put together a small Docker Compose setup with a simple OIDC provider, along with the corresponding Wakapi configuration:
2354c2c

Wakapi configuration:

security:
  disable_local_auth: true
#  [...]
  oidc:                                     # list of openid connect providers available for user signup and login, see https://github.com/muety/wakapi/wiki/OpenID-Connect-login-(SSO)
    - name: oidc
      display_name: OIDC
      client_id: wakapi
      client_secret: wakapi
      endpoint: http://localhost:5556/dex/

[muety]

Amazing contribution, thanks a lot! 🙌