如何在flutter web中使用cognito登录？

import 'package:flutter_cognito_plugin/flutter_cognito_plugin.dart';

void main() {
  CognitoConfiguration configuration = CognitoConfiguration(
    userPoolId: 'your_user_pool_id',
    clientId: 'your_client_id',
    region: 'your_region',
  );
  
  Cognito.initialize(configuration);
  runApp(MyApp());
}

import 'package:flutter_cognito_plugin/flutter_cognito_plugin.dart';

class LoginPage extends StatelessWidget {
  final TextEditingController _usernameController = TextEditingController();
  final TextEditingController _passwordController = TextEditingController();
  
  void _login() async {
    String username = _usernameController.text;
    String password = _passwordController.text;
    
    try {
      await Cognito.signIn(username, password);
      // 登录成功，跳转到主页或其他页面
    } catch (e) {
      // 处理登录失败的情况
    }
  }
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Login')),
      body: Column(
        children: [
          TextField(controller: _usernameController),
          TextField(controller: _passwordController),
          ElevatedButton(
            onPressed: _login,
            child: Text('Login'),
          ),
        ],
      ),
    );
  }
}