[client] Add Auth.Stop() to cancel an in-progress interactive login

[pappz]

The iOS PKCE login runs in the main-app process, decoupled from the network extension (the extension's client context is torn down on login-required, which would otherwise kill the WaitToken goroutine before the OAuth callback arrives). Because it is decoupled, nothing aborted the flow when the user dismissed the browser without logging in: WaitToken kept its loopback HTTP server bound to the redirect port until the flow expired, so the next connect stalled trying to bind the same port.

Make the Auth context cancellable and add Auth.Stop(), which cancels it. Cancelling unblocks WaitToken, whose deferred server.Shutdown frees the port immediately. This mirrors how Android's stopEngine() aborts login via the engine context.

NewAuthWithConfig now also derives a cancellable context; its only iOS caller uses LoginSync (no interactive server), so behaviour is unchanged there.

Describe your changes

Issue ticket number and link

Stack

Checklist

• Is it a bug fix
• Is a typo/documentation fix
• Is a feature enhancement
• It is a refactor
• Created tests that fail without the change (if possible)
• This change does not modify the public API, gRPC protocols, functionality behavior, CLI / service flags, or introduce a new feature — OR I have discussed it with the NetBird team beforehand (link the issue / Slack thread in the description). See CONTRIBUTING.md.

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Documentation

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• I added/updated documentation for this change
• Documentation is not needed for this change (explain why)

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Paste the PR link from https://github.com/netbirdio/docs here:

https://github.com/netbirdio/docs/pull/__

Summary by CodeRabbit

• New Features
  • Added the ability to cancel in-progress authentication flows. Users can now abort interactive login operations on-demand for improved control over the authentication process.

[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

Run ID: 8068e076-7755-4a71-a9b5-abb086165ff7

📥 Commits

Reviewing files that changed from the base of the PR and between 58c79f5 and ef0601b.

📒 Files selected for processing (1)

• client/ios/NetBirdSDK/login.go

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📝 Walkthrough

Walkthrough

The Auth struct in client/ios/NetBirdSDK/login.go gains a cancel context.CancelFunc field. NewAuth and NewAuthWithConfig now create cancellable contexts via context.WithCancel and store the resulting cancel function. A new exported Stop() method invokes that cancel function to abort an in-progress interactive login.

Changes

iOS SDK Auth Cancellation

Layer / File(s)	Summary
Auth cancel field, constructor updates, and Stop() method client/ios/NetBirdSDK/login.go	Auth struct adds cancel context.CancelFunc; NewAuth and NewAuthWithConfig derive cancellable contexts and store the cancel func; new Stop() method calls the stored cancel func when set.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~5 minutes

Poem

🐇 Hippity-hop, the login shall stop,
A cancel func tucked in a cozy struct slot.
When auth runs long and the user says "nay,"
Just call Stop() and whisk it away!
The context is cancelled, the goroutine freed—
A graceful abort is all that we need. ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding Auth.Stop() to cancel interactive login flows, which is the primary objective of this PR.
Description check	✅ Passed	The description comprehensively explains the problem, solution, and implementation details, and properly completes the required template sections including bug fix classification and documentation decision.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
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.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ios-auth-stop-cancel

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

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