fix(#75): add biometric authentication#521
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- src/services/auth/biometricService.ts:
- Lazy-loads expo-local-authentication so app never crashes if the
native module is not yet linked
- isAvailable(): checks hardware + enrollment
- getSupportedTypes(): fingerprint / facial / iris
- authenticate(): wraps authenticateAsync with PIN fallback option
- authenticateIfEnabled(): reads settings and skips prompt when
biometrics are disabled
- getSettings() / saveSettings(): persists { enabled, fallbackToPIN }
to AsyncStorage
- src/hooks/useBiometricAuth.ts:
- Loads availability, supported types, and settings on mount
- authenticate() triggers prompt and tracks loading/error/cancelled
- saveSettings() persists user preference changes
- src/components/BiometricGate.tsx:
- Lock screen shown on launch when biometrics are enabled
- Auto-prompts on mount and on foreground (AppState listener)
- Shows biometric icon (Face ID / fingerprint / iris / lock)
- Error card with retry button on failure
- Passes through immediately when biometrics disabled or unavailable
Requires: npx expo install expo-local-authentication
- Wrap AppNavigator with BiometricGate inside ErrorBoundary - Import BiometricGate from src/components/BiometricGate - Gate renders lock screen on launch when biometrics are enabled; passes through immediately when disabled or unavailable
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Summary
Closes #75
Adds Face ID / Touch ID / fingerprint authentication with PIN fallback, an optional setting, and a lock screen that prompts on launch and on foreground.
Files
src/services/auth/biometricService.ts(new)expo-local-authentication— app never crashes if module not linkedisAvailable()— checks hardware + enrollmentgetSupportedTypes()— fingerprint / facial / irisauthenticate(reason, fallbackToPIN)— wrapsauthenticateAsyncwith PIN fallbackauthenticateIfEnabled()— skips prompt when user has disabled biometricsgetSettings()/saveSettings()— persists{ enabled, fallbackToPIN }to AsyncStoragesrc/hooks/useBiometricAuth.ts(new)authenticate()tracks loading / error / cancelled statesaveSettings()persists preference changessrc/components/BiometricGate.tsx(new)AppStatelistener — re-locks on background)App.tsxAppNavigatorwithBiometricGateinsideErrorBoundarySetup
Acceptance Criteria
biometricService.saveSettings({ enabled }))