Google sign in flutter web

main.dart

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:google_sign_in_web/google_sign_in_web.dart';
import 'package:google_sign_in_web/web_only.dart' as web;


void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a purple toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  GoogleSignInAccount? _currentUser;
  late final GoogleSignIn _googleSignIn;
  final List<String> scopes = const ['email'];

  final _configuration = GSIButtonConfiguration(
    type: GSIButtonType.standard,
    theme: GSIButtonTheme.outline,
    text: GSIButtonText.signin,
  );

  @override
  void initState() {
    super.initState();
    _googleSignIn = GoogleSignIn(
      clientId: '178013589715-d29rm65us1c1dc5g7tm7b2ugu8bf8k08.apps.googleusercontent.com',
      scopes: scopes,
    );


    _googleSignIn.onCurrentUserChanged.listen((GoogleSignInAccount? account) async {
      
      // How to get the idToken
      // https://stackoverflow.com/questions/52458968/did-anyone-manage-to-get-the-id-token-from-google-sign-in-flutter
      account?.authentication.then((googleKey) {
        print('Google Key: ${googleKey.idToken}');
      });

      setState(() {
        _currentUser = account;
      });
      if (account != null && kIsWeb) {
        final isAuthorized = await _googleSignIn.canAccessScopes(scopes);
        print('Is kIsWeb | authorized: $isAuthorized');
      }
    });
  }

  // void _handleSignIn() async {
  //   try {
  //     final GoogleSignInAccount? user = await _googleSignIn.signInSilently();
  //     print('User: $user');
  //     setState(() {
  //       _currentUser = user;
  //     });
  //   } catch (error) {
  //     print('Error signing in: $error');
  //   }
  // }

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }
  
  Future<void> _handleAuthorizeScopes() async {
    final bool isAuthorized = await _googleSignIn.requestScopes(scopes);
    print('Is authorized: $isAuthorized');
    
    // setState(() {
    //   _isAuthorized = isAuthorized;
    // });

  }


  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.


  
    return Scaffold(
      appBar: AppBar(
        // TRY THIS: Try changing the color here to a specific color (to
        // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
        // change color while the other colors stay the same.
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          //
          // TRY THIS: Invoke "debug painting" (choose the "Toggle Debug Paint"
          // action in the IDE, or press "p" in the console), to see the
          // wireframe for each widget.
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            
            const Text(
              'You have pushed the button this many times:',
            ),
            
            Text(
              'Current user: $_currentUser',
              style: Theme.of(context).textTheme.headlineMedium,
            ),

            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
            
            // ElevatedButton(
            //   onPressed: () {
            //     _handleSignIn();
            //   },
            //   child: const Text('Sign In'),
            // ),

            web.renderButton(
              configuration: _configuration,
            ),

            ElevatedButton(
              onPressed: _handleAuthorizeScopes,
              child: const Text('Authorize Scopes'),
            ),

          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}