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Kordant/tasks/ios-production/08-oauth-social-login.md
2026-05-26 16:06:34 -04:00

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# 08. OAuth & Social Login Integration
meta:
id: ios-production-08
feature: ios-production
priority: P1
depends_on: []
tags: [auth, security, production]
objective:
- Implement OAuth and social login (Apple Sign-In, Google) to replace the stubbed auth client
deliverables:
- Apple Sign-In integration
- Google Sign-In integration
- Backend OAuth token exchange
- AuthService wired to real API client
steps:
1. Implement Apple Sign-In:
- Configure Sign in with Apple in Apple Developer portal
- Add com.apple.developer.applesignin.customauth entitlement
- Implement ASAuthorizationController in AuthService
- Handle authorization code and identity token
- Send Apple credentials to backend for verification
2. Implement Google Sign-In:
- Configure Google Sign-In in Firebase/Google Cloud Console
- Add URL scheme for Google callback
- Integrate GoogleSignIn SDK
- Handle ID token and send to backend
3. Update backend for OAuth:
- Add OAuth endpoints to tRPC user router
- Verify Apple ID token with Apple public keys
- Verify Google ID token with Google certs
- Create/link user accounts from OAuth providers
- Return session token after OAuth login
4. Replace StubAPIClient:
- Create real API client implementing AuthAPIClientProtocol
- Wire into AuthService initialization in KordantApp.swift
- Remove StubAPIClient from production builds
- Keep StubAPIClient for unit tests
5. Add token refresh:
- Implement refresh token rotation
- Silent token refresh on expiry
- Handle refresh failure (re-authenticate)
6. Add logout for OAuth:
- Revoke OAuth tokens where possible
- Clear all local auth state
- Notify backend of logout
tests:
- Unit: Test OAuth token parsing and validation
- Integration: Test Apple Sign-In flow end-to-end
- Integration: Test Google Sign-In flow end-to-end
- Security: Verify token validation rejects invalid tokens
acceptance_criteria:
- Apple Sign-In working on iOS 13+
- Google Sign-In working with Firebase
- OAuth tokens verified server-side
- User accounts created or linked correctly
- AuthService uses real API client in production
- Token refresh working silently
- Logout clears all auth state and revokes tokens
- Unit tests use mock client, production uses real client
- Error handling for cancelled sign-in attempts
validation:
- Tap Apple Sign-In → native sheet → authenticate → logged in
- Tap Google Sign-In → Google flow → authenticate → logged in
- Check backend → user created with correct provider
- Wait for token expiry → automatic refresh
- Logout → all tokens cleared, login screen shown
notes:
- Apple Sign-In is required if app uses other third-party sign-in
- Apple Sign-In must be primary button if multiple options
- Store Apple user ID for account linking
- Backend must verify Apple JWT with Apple's public key