Fix TypeError at /o/token/

[aibaq]

Fixes #

Description of the Change

Django User's last_login field is nullable, so /o/token/ endpoint raises TypeError when last_login is null when using oidc

This fix sets timezone.now() as a default value for auth_time

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• [o] documentation updated (not needed)
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
oauth2_provider/oauth2_validators.py	66.66%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

[dopry]

@aibaq this is a great start. to help me understand the issue a bit more, in what scenario did you encounter this issue? I would expect that a user would have logged in at least once by the time get_id_token_dictionary was called. I'd like to understand how this was occurring to both correct my expectations and ensure there isn't a bug somewhere else that is allow a token to be generated for a user that isn't authenticated. It also looks like there is a code path that is uncovered that will need to be tested.

[Copilot]

Pull Request Overview

This pull request fixes a TypeError that occurs at the /o/token/ endpoint when using OIDC and the Django User's last_login field is null. The fix adds a null check for last_login and provides a fallback value using the current timestamp.

• Added null safety check for request.user.last_login before accessing it
• Set timezone.now().timestamp() as fallback when last_login is null
• Added test case to verify the fix works with null last_login values

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
oauth2_provider/oauth2_validators.py	Added null check for last_login and fallback to current timestamp
tests/test_oauth2_validators.py	Added test setup to simulate user with null last_login
CHANGELOG.md	Added entry for the TypeError fix
AUTHORS	Added contributor name

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