Configure post-logout redirect URI for OAuth2/OIDC

[DanielStuempel]

• Breaking change? (if so, please describe the impact and migration path for existing application instances)

What changes did you make? (Give an overview)
Added a post logout redirect URI so the auth provider redirects back to Kafka UI after logout.
According to documentation: https://docs.spring.io/spring-security/reference/reactive/oauth2/login/logout.html#oauth2login-advanced-oidc-logout

Is there anything you'd like reviewers to focus on?
No.

How Has This Been Tested? (put an "x" (case-sensitive!) next to an item)

• No need to
• Manually: compiled locally, deployed to Kubernetes, verified redirect with Keycloak OIDC
• Unit checks
• Integration checks
• Covered by existing automation

Checklist (put an "x" (case-sensitive!) next to all the items, otherwise the build will fail)

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (e.g. ENVIRONMENT VARIABLES)
• My changes generate no new warnings (e.g. Sonar is happy)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged

Check out Contributing and Code of Conduct

Summary by CodeRabbit

• Bug Fixes
  • Improved OpenID Connect logout behavior by redirecting users to the application’s base URL after logout.

[kapybro]

AI Summary

Kafka UI currently lacks a configured redirect URI after user logout, preventing the auth provider from returning to the application. This change adds a post-logout redirect URI to the OIDC configuration, ensuring the user is properly redirected back to Kafka UI following a session termination.

[github-actions]

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 34b8b707-dc29-442e-80f2-38b7f71cc667

📥 Commits

Reviewing files that changed from the base of the PR and between 07c4351 and fe06bb0.

📒 Files selected for processing (1)

• api/src/main/java/io/kafbat/ui/config/auth/OAuthSecurityConfig.java

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📝 Walkthrough

Walkthrough

The default OIDC logout handler now sets {baseUrl} as the post-logout redirect URI before returning the handler.

Changes

OAuth logout flow

Layer / File(s)	Summary
Configure OIDC logout redirect api/src/main/java/io/kafbat/ui/config/auth/OAuthSecurityConfig.java	The handler now configures {baseUrl} as the post-logout redirect URI before returning.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Mergeability Score: ⚪ Minimal · up to fe06b

This localized authentication configuration change adds the post-logout redirect behavior; no actionable merge-blocking risk remains after normal checks and review.

Suggested reviewers: alexeyzavyalov

Poem

A rabbit logs out with a hop and a cheer,
{baseUrl} guides the return path clear.
The handler is set, then sent on its way,
For a tidy goodbye at the end of the day.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: configuring a post-logout redirect URI for OAuth2/OIDC.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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