Implement Native Apple Sign-In with Auth0 in React Native

This article guides developers on how to implement native Apple Sign-In in a React Native application. Implement Apple Native Sign-In directly using the @invertase/react-native-apple-authentication package and Auth0's Token Exchange flow via the react-native-auth0 SDK. This avoids using a web browser and keeps the authentication flow fully native. By using a native implementation, the sign-in flow remains seamless and browser-free, offering a more integrated user experience.

Acceptance Criteria:

• Apple Sign-In is integrated using the @invertase/react-native-apple-authentication package.
• Identity token from Apple is exchanged using auth0.auth.exchangeNativeSocial.
• Auth0 credentials are securely stored using auth0.credentialsManager.
• A fallback message is shown on unsupported platforms (e.g., Android or iOS < 13).
• Proper Auth0 configuration is verified and documented.

Dependencies to Install:

npm install react-native-auth0

npm install @invertase/react-native-apple-authentication

• React Native Apps

When integrating Apple Sign-In with Auth0, using a web-based login flow can lead to poor UX and potential platform limitations. A fully native implementation avoids these issues and meets Apple's guidelines more closely.

Implementation Steps: 

1. Install & Configure Dependencies

• • Install required packages listed above.
  • Configure Apple Sign-In in Xcode (entitlements, capabilities).
  • Ensure Apple Developer and Auth0 dashboard configurations are complete.

2. Check Apple Sign-In Support
   

   const isAppleSignInAvailable = Platform.OS === 'ios' && 
     appleAuth.isSupported && 
     parseInt(Platform.Version, 10) >= 13;

3. Sign-In Flow:

• • Use Apple’s SDK to get identityToken.
  • Exchange it with Auth0 using:
    

    auth0.auth.exchangeNativeSocial({
      subjectToken: identityToken,
      subjectTokenType: 'http://auth0.com/oauth/token-type/apple-id-token',
      scope: 'openid profile email',
      userProfile: JSON.stringify({
        name: { firstName, lastName },
        email
      }),
    });

4. Post-authentication:

• • Store credentials via auth0.credentialsManager.saveCredentials.
  • Update UI and user state accordingly.