feat: allow OIDC cookies when in-cluster is false via flag

[beep-boopp]

Summary

Adds the --oidc-use-cookie flag to allow OIDC authentication configuration when Headlamp is running in a local or development environment (non–in-cluster mode).

Related Issue

Fixes #4481

Changes

• pkg/config/config.go

  • Added the OidcUseCookie flag.
  • Updated Validate() logic to permit OIDC settings when this flag is enabled.

• pkg/config/config_test.go

  • Added test cases to TestParseBasic to verify the success path.
  • Added test cases to TestParseErrors to ensure proper error messaging when the flag is missing.

• cmd/server.go

  • Wired OidcUseCookie from the config parser into the internal server configuration.

• Error messaging

  • Improved validation errors to clearly indicate the requirement for either in-cluster mode or the --oidc-use-cookie flag.

Steps to Test

1. Build the backend:

   go build ./cmd/headlamp

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[illume]

Can you please have a look at fixing the merge conflict?

We use linux kernel style git commit messages. Please see the contributing guide and the section in there about git commit messages.

Also, please remove Signed-off-by, as that is not needed in this repo. Thanks!

[Copilot]

Pull request overview

Adds support for enabling OIDC token cookies when Headlamp is not running in in-cluster mode, via a new --oidc-use-cookie config/flag, intended to unblock local/dev usage with OIDC-based kubeconfigs.

Changes:

• Add oidc-use-cookie flag/config field and relax OIDC validation rules when it is enabled.
• Extend internal HeadlampCFG to carry the new setting.
• Allow Helm release routes to pull auth tokens from cookies when in-cluster or oidc-use-cookie is enabled.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
backend/pkg/headlampconfig/headlampConfig.go	Adds OidcUseCookie to internal backend config struct.
backend/pkg/config/config.go	Adds OidcUseCookie config + flag; updates Validate() gating logic and error message.
backend/pkg/config/config_test.go	Updates expected validation error substring for non-in-cluster OIDC flags.
backend/cmd/headlamp.go	Enables cookie-token behavior for Helm release handler when in-cluster or flag-enabled; initializes oidcUseCookie from HeadlampCFG.

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[beep-boopp]

Can you please have a look at fixing the merge conflict?

We use linux kernel style git commit messages. Please see the contributing guide and the section in there about git commit messages.

Also, please remove Signed-off-by, as that is not needed in this repo. Thanks!

Thanks for the review. I'll go over the requested changes, fix the merge conflicts, and update the commit message style (including removing the sign-off).

[beep-boopp]

Hey! I've updated the PR to address the feedback. I've switched the commit message to the requested style , cleaned up that multiline error string, and added a success case to the unit tests as suggested. If you spot any other adjustments needed, just let me know.

[beep-boopp]

Hey, sorry for the extra push, the linter caught a formatting issue and a long line I missed. All fixed now

[mudit06mah]

@beep-boopp Please address the review from copilot

[beep-boopp]

@beep-boopp Please address the review from copilot

All good, I've already pushed the fixes and addressed those Copilot points. Resolving the threads now.

[mudit06mah]

All good, I've already pushed the fixes and addressed those Copilot points. Resolving the threads now.

Why has it not reflected in your Files Changed then?

Please look at other suggestions as well

[beep-boopp]

All good, I've already pushed the fixes and addressed those Copilot points. Resolving the threads now.

Why has it not reflected in your Files Changed then?

Please look at other suggestions as well

@mudit06mah The fix is already in server.go (as shown in my latest commit). I manually mapped conf.OidcUseCookie to the internal config struct, which is why GitHub says the suggestion can't be applied ,the code has already been updated to handle the wiring. I have made all the changes requested

[mudit06mah]

@beep-boopp You have indeed made the wiring changes, it was that copilot messages did not have the outdated tag that got me confused.
Your changes LGTM,
Please change your commit message to something like:

backend: cmd: pkg: Allow OIDC cookies when in-cluster is false via flag

(First letter of commit message is capitalized)
Also change your PR Title to match your commit message and update the PR body for the new changes as well :)

[beep-boopp]

@beep-boopp You have indeed made the wiring changes, it was that copilot messages did not have the outdated tag that got me confused. Your changes LGTM, Please change your commit message to something like:

backend: cmd: pkg: Allow OIDC cookies when in-cluster is false via flag

(First letter of commit message is capitalized) Also change your PR Title to match your commit message and update the PR body for the new changes as well :)

@mudit06mah No worries, I've updated the commit message to follow the repo's area-prefix style and refreshed the PR body with the full summary and test steps. GitHub isn't letting me edit the PR title itself (probably a permission thing), so that's all set on my end.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

---

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[illume]

Thanks.

Can you please see the open review notes?

[beep-boopp]

Thanks.

Can you please see the open review notes?

Thanks for the review!
I’ve removed the redundant OidcUseCookie assignment , good catch.
For test coverage, I added TestOidcUseCookieLogic to specifically verify the new behavior (promoting the token from the auth cookie to the Authorization header when the flag is enabled). I chose a focused unit test to validate the logic directly, rather than adding a handler level test that would require substantial mocking of the store, Kubernetes client, and router.
If you feel coverage at the handler level is necessary for this change, I’m happy to add it.

[mudit06mah]

@beep-boopp Could you also add this flag to values.yaml and deployment.yaml for the helm charts? Update the documentation as well.

[beep-boopp]

@mudit06mah Thanks for the review! I've updated the PR to include the full Helm chart configuration (values.yaml, deployment.yaml) and the documentation in README.md to ensure this feature is deployable out-of-the-box.
@illume The PR is now feature-complete with backend logic, unit tests, and full Helm support. Ready for your final look.

[illume]

Thanks for doing those changes.

There’s a github check failing.

Please run the linter locally to see:
npm run backend:lint

[beep-boopp]

@illume All checks are passing now. Ready for your review. Thanks for your patience!

[illume]

🎉 thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: beep-boopp, illume

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[illume]

@beep-boopp I’ll wait a little while before merging this to give folks a chance to have a look and provide feedback. Are you able to ask in the headlamp channel on the kubernetes slack for someone to review?

I asked the original issue reporter for feedback, maybe they will have time to respond too.

thanks again!!

[beep-boopp]

@beep-boopp I’ll wait a little while before merging this to give folks a chance to have a look and provide feedback. Are you able to ask in the headlamp channel on the kubernetes slack for someone to review?

I asked the original issue reporter for feedback, maybe they will have time to respond too.

thanks again!!

Thanks for the approval!
I just posted a note in the #headlamp channel on Kubernetes Slack to ask for community feedback. I'll keep an eye out for any comments there

[beep-boopp]

@illume Just a heads up, I’ve rebased onto the latest main to resolve the conflicts caused by the recent backend refactor .