google_auth

Simple google authentication plugin for flutter.

Configuration

Android

No configuration required.

iOS

In info.plist add the following:

<key>CFBundleURLTypes</key>
<array>
    <dict>
        <key>CFBundleURLSchemes</key>
        <array>
            <string>$(DEFINE_GOOGLE_CLIENT_ID_IOS)</string>
        </array>
    </dict>
</array>

with $(DEFINE_GOOGLE_CLIENT_ID_IOS) being the client id of your app.

Usage

• Add the plugin to pubspec.yaml: flutter pub add google_auth.
• Import the plugin in your dart code: import 'package:google_auth/google_auth.dart';.
• To authenticate user: GoogleAuth().signIn(clientId) with clientId: string being the client id. This function returns a Future object resolving a string of the id token.
  • For iOS, use the client id setup for iOS app.
  • For Android, use the client id setup for Web app. Note: if you use the client id setup for Android app, you will get an error saying that the developer console is not setup correctly.
• To logout user: GoogleAuth().signOut(): Future<void>.
• Possible error code: check the error code with

try {
  return {'idToken': await GoogleAuth().signIn(clientId)};
} on PlatformException catch (e) {
  if (e.code == 'API_CANCELED' || e.code == 'GSI_SIGN_IN_CANCELLED') {
    throw AppError('User has cancelled');
  }
  rethrow;
}

• For iOS: see https://github.com/tranvansang/flutter_google_auth/tree/master/ios/Classes/GoogleAuthDelegate.swift#L4
• For Android: see https://github.com/tranvansang/flutter_google_auth/tree/master/android/src/main/kotlin/me/transang/plugins/google_auth/GoogleAuthDelegate.kt#L20

SDK versions

• Android

    implementation 'com.google.android.gms:play-services-auth:20.5.0'

• iOS

  s.dependency 'GoogleSignIn', '~> 7.0'