If you’re an avid developer working with Amplify Flutter, you might have stumbled upon the frustrating “handleWebUISignInResponse is not supported” error after successfully integrating Google Sign In into your app. Don’t worry, you’re not alone! This article is here to guide you through the solution, providing clear and direct instructions to get you back on track.
Understanding the Error
Before we dive into the solution, it’s essential to understand what’s causing this error in the first place. The “handleWebUISignInResponse is not supported” error occurs when the Amplify Flutter plugin tries to handle the Google Sign In response in a web UI, which is not supported by default.
This error typically arises when you’re using the `amplify_auth_cognito` plugin to authenticate users with Google Sign In, and you haven’t properly configured the plugin to handle the response correctly.
Step-by-Step Solution
Fear not, dear developer! We’ll walk you through the step-by-step solution to resolve this error and get your app up and running smoothly.
Step 1: Add the necessary dependencies
First, ensure you have the following dependencies in your `pubspec.yaml` file:
dependencies: amplify_auth_cognito: ^4.0.1 amplify_flutter: ^4.0.1 google_sign_in: ^5.0.4
Don’t forget to run `flutter pub get` in your terminal to update your dependencies.
Step 2: Configure the Amplify Auth Plugin
In your `main()` function, configure the Amplify Auth plugin to use the `GoogleSignIn` plugin:
import 'package:amplify_auth_cognito/amplify_auth_cognito.dart'; import 'package:google_sign_in/google_sign_in.dart'; Future main() async { WidgetsFlutterBinding.ensureInitialized(); // Initialize Amplify Amplify.configure(amplifyconfig); // Configure Amplify Auth to use Google Sign In await Amplify.addPlugin(AmplifyAuthCognito( googleSignIn: GoogleSignIn( scopes: [ 'email', 'profile', ], ), )); runApp(MyApp()); }
Step 3: Handle the Google Sign In Response
Now, create a function to handle the Google Sign In response manually:
Future _handleGoogleSignInResponse() async { try { final GoogleSignInAccount googleUser = await GoogleSignIn().signIn(); final GoogleSignInAuthentication googleAuth = await googleUser.authentication; // Use the received auth code to authenticate with Cognito final authCode = googleAuth.accessToken; final credentials = await Amplify.Auth.fetchAuthSession( options: CognitoAuthSessionOptions( authCode, CognitoUserPoolInfo( 'YOUR_POOL_ID', 'YOUR_CLIENT_ID', ), ), ); // Get the authenticated user final user = await Amplify.Auth.getCurrentUser(); print('Authenticated user: $user'); } catch (e) { print('Error signing in with Google: $e'); } }
Replace `YOUR_POOL_ID` and `YOUR_CLIENT_ID` with your actual Cognito User Pool ID and Client ID.
Step 4: Update your UI to Call the _handleGoogleSignInResponse Function
Finally, update your UI to call the `_handleGoogleSignInResponse` function when the user taps the Google Sign In button:
ElevatedButton( onPressed: _handleGoogleSignInResponse, child: Text('Sign in with Google'), )
Troubleshooting Common Issues
If you’re still facing issues, check the following common problems:
-
Invalid Cognito User Pool ID or Client ID
Double-check that you’ve replaced `YOUR_POOL_ID` and `YOUR_CLIENT_ID` with your actual Cognito User Pool ID and Client ID.
-
Google Sign In Configuration Issues
Verify that you’ve correctly configured the Google Sign In plugin in your Android and iOS projects.
-
Amplify Auth Plugin Not Initialized
Ensure you’ve initialized the Amplify Auth plugin in your `main()` function before attempting to sign in with Google.
Conclusion
Voilà! With these steps, you should now be able to resolve the “handleWebUISignInResponse is not supported” error in Amplify Flutter after integrating Google Sign In. Remember to adapt the solution to your specific use case, and don’t hesitate to reach out if you encounter any further issues.
Happy coding, and may your app be sign-in-error-free!
Plugin | Version |
---|---|
amplify_auth_cognito | ^4.0.1 |
amplify_flutter | ^4.0.1 |
google_sign_in | ^5.0.4 |
Note: The versions mentioned above are subject to change, and you should always check the latest versions available.
- Amplify Flutter Authentication with Google
- Google Sign In Plugin for Flutter
- Amplify Flutter Authentication Quickstart
Frequently Asked Question
Struggling with the “handleWebUISignInResponse is not supported” error after Google Sign In with Amplify Flutter? Don’t worry, we’ve got you covered! Check out these frequently asked questions to get back on track.
What causes the “handleWebUISignInResponse is not supported” error in Amplify Flutter?
The error usually occurs when Amplify Flutter can’t handle the response from the Google Sign In web UI. This can happen if you’re using an outdated version of the Amplify Flutter package or if there’s an issue with the configuration of the Google Sign In plugin.
How do I update the Amplify Flutter package to resolve the error?
To update the Amplify Flutter package, run the command `flutter pub upgrade amplify_flutter` in your terminal. This will ensure you have the latest version of the package. Then, re-run your app to see if the error is resolved.
What if updating the package doesn’t resolve the error?
If updating the package doesn’t work, try initializing the Amplify Flutter instance with the correct configuration for Google Sign In. Make sure you’ve added the `Amplify.addPlugin(amplify_auth_cognito()` line in your `main()` function, and that you’ve configured the `GoogleSignInPlugin` correctly.
Can I use a custom Google Sign In implementation to avoid the error?
Yes, you can use a custom Google Sign In implementation, but it’s not recommended. Amplify Flutter provides a built-in Google Sign In plugin that handles the sign-in flow and token exchange for you. Using a custom implementation can lead to additional complexity and potential security issues.
Where can I find more resources to troubleshoot the error?
Check out the official Amplify Flutter documentation and GitHub issues page for more information on troubleshooting the “handleWebUISignInResponse is not supported” error. You can also reach out to the Amplify Flutter community on forums or social media for additional support.