fix: prevent double login in Capacitor by waiting for auth state before navigating

[yogeshchoudhary147]

Summary

• Fixes a double login issue in Capacitor/Ionic apps (Double login redirect on ionic + angular workflow #668)
• In Capacitor, the app is already initialized when handleRedirectCallback is called manually, so isLoading is false. The previous code called refresh() and navigated immediately without waiting for the async auth state update, causing AuthGuard to read the stale cached false value and trigger a second login.
• Fix: change tap to switchMap in handleRedirectCallback and wait for isAuthenticated$ to become true before navigating, only in the !isLoading (Capacitor) path. The SPA path is unchanged.

Test plan

• All existing unit tests pass
• Manually test Capacitor login flow — user should not be redirected to login a second time after a successful callback

Closes #668

Summary by CodeRabbit

• Bug Fixes
  • Improved redirect handling after authentication to ensure navigation occurs only after the authenticated state is confirmed.
  • Preserved app state and connected-account information during redirect processing.
  • Improved consistency when handling redirects with or without an initial application state.

[coderabbitai]

📝 Walkthrough

Walkthrough

handleRedirectCallback now waits for refreshed authentication state before navigating when the application is not loading. Redirect callback tests mock successful authentication for the affected scenarios.

Changes

Redirect state synchronization

Layer / File(s)	Summary
Callback refresh and navigation flow projects/auth0-angular/src/lib/auth.service.ts	handleRedirectCallback refreshes authentication state, waits for isAuthenticated$ to emit true, then navigates and returns the result. Loading paths navigate immediately.
Callback behavior test updates projects/auth0-angular/src/lib/auth.service.spec.ts	Affected redirect callback tests mock isAuthenticated to resolve to true.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested reviewers: frederikprijck

Sequence Diagram(s)

sequenceDiagram
  participant AuthService
  participant AuthState
  participant AuthGuard
  participant Router
  AuthService->>AuthState: refresh authentication state
  AuthState-->>AuthService: isAuthenticated$ emits true
  AuthService->>Router: navigate to target URL
  Router->>AuthGuard: evaluate protected route
  AuthGuard-->>Router: use refreshed authenticated state

Loading

Merge Risk: 🟡 Moderate · up to 102f9

Some callbacks can still navigate using stale authentication state, leaving affected Capacitor users vulnerable to another login or an incorrect redirect.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes address [#668]. In AuthService.handleRedirectCallback, the !isLoading path calls authState.refresh(), waits for isAuthenticated$ to emit true with filter and take(1), and nav…
Out of Scope Changes check	✅ Passed	The reviewed changes are limited to handleRedirectCallback and its related unit-test setup. The changes support the double-login fix in [#668]. No unrelated product behavior or files are identified.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main fix: preventing duplicate login in Capacitor by waiting for authentication state before navigation.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

📝 Generate docstrings

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/capacitor-double-login

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Actionable comments posted: 1

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Inline comments:
In `@projects/auth0-angular/src/lib/auth.service.ts`:
- Around line 426-436: Update the isLoading-false branch in the authState
refresh flow to ignore the replayed isAuthenticated$ value and wait for the
emission triggered by refresh() before applying filter/take(1) and calling
navigator.navigateByUrl(target). Preserve returning result after navigation.

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ℹ️ Review info

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Run ID: 3de552ae-4a92-42d7-a4b2-0e4a5509a24f

📥 Commits

Reviewing files that changed from the base of the PR and between d3886a9 and 22b57d8.

📒 Files selected for processing (2)

• projects/auth0-angular/src/lib/auth.service.spec.ts
• projects/auth0-angular/src/lib/auth.service.ts

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