flutter_next_auth 1.2.1

A Flutter package for NextERP (Frappe/ERPNext) authentication with secure session management.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter_next_auth/flutter_next_auth.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  // Initialize with your NextERP server URL
  await flutternext.initialize(
    baseUrl: 'https://demo.erpnext.com', // Replace with your server URL
  );
  
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Next Auth Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        useMaterial3: true,
      ),
      home: const SplashScreen(),
    );
  }
}

class SplashScreen extends StatefulWidget {
  const SplashScreen({super.key});

  @override
  State<SplashScreen> createState() => _SplashScreenState();
}

class _SplashScreenState extends State<SplashScreen> {
  @override
  void initState() {
    super.initState();
    _checkSession();
  }

  Future<void> _checkSession() async {
    // Wait a bit for splash effect
    await Future.delayed(const Duration(seconds: 1));
    
    // Try to restore session
    final result = await flutternext.relogin();
    
    if (mounted) {
      if (result.success) {
        // Navigate to home
        Navigator.of(context).pushReplacement(
          MaterialPageRoute(builder: (_) => const HomeScreen()),
        );
      } else {
        // Navigate to login
        Navigator.of(context).pushReplacement(
          MaterialPageRoute(builder: (_) => const LoginScreen()),
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return const Scaffold(
      body: Center(
        child: CircularProgressIndicator(),
      ),
    );
  }
}

class LoginScreen extends StatefulWidget {
  const LoginScreen({super.key});

  @override
  State<LoginScreen> createState() => _LoginScreenState();
}

class _LoginScreenState extends State<LoginScreen> {
  final _formKey = GlobalKey<FormState>();
  final _usernameController = TextEditingController();
  final _passwordController = TextEditingController();
  bool _isLoading = false;
  bool _obscurePassword = true;

  @override
  void dispose() {
    _usernameController.dispose();
    _passwordController.dispose();
    super.dispose();
  }

  Future<void> _handleLogin() async {
    if (!_formKey.currentState!.validate()) return;

    setState(() => _isLoading = true);

    final result = await flutternext.login(
      usr: _usernameController.text.trim(),
      pwd: _passwordController.text,
    );

    if (mounted) {
      setState(() => _isLoading = false);

      if (result.success) {
        Navigator.of(context).pushReplacement(
          MaterialPageRoute(builder: (_) => const HomeScreen()),
        );
      } else {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text(result.message ?? 'Login failed'),
            backgroundColor: Colors.red,
          ),
        );
      }
    }
  }

  void _navigateToForgotPassword() {
    Navigator.of(context).push(
      MaterialPageRoute(builder: (_) => const ForgotPasswordScreen()),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Login'),
      ),
      body: SafeArea(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(24.0),
          child: Form(
            key: _formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                const SizedBox(height: 48),
                const Icon(
                  Icons.lock_outline,
                  size: 80,
                  color: Colors.blue,
                ),
                const SizedBox(height: 48),
                TextFormField(
                  controller: _usernameController,
                  keyboardType: TextInputType.emailAddress,
                  decoration: const InputDecoration(
                    labelText: 'Username / Email',
                    border: OutlineInputBorder(),
                    prefixIcon: Icon(Icons.person),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Please enter your username';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 16),
                TextFormField(
                  controller: _passwordController,
                  obscureText: _obscurePassword,
                  decoration: InputDecoration(
                    labelText: 'Password',
                    border: const OutlineInputBorder(),
                    prefixIcon: const Icon(Icons.lock),
                    suffixIcon: IconButton(
                      icon: Icon(
                        _obscurePassword ? Icons.visibility : Icons.visibility_off,
                      ),
                      onPressed: () {
                        setState(() => _obscurePassword = !_obscurePassword);
                      },
                    ),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Please enter your password';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 24),
                ElevatedButton(
                  onPressed: _isLoading ? null : _handleLogin,
                  style: ElevatedButton.styleFrom(
                    padding: const EdgeInsets.symmetric(vertical: 16),
                  ),
                  child: _isLoading
                      ? const SizedBox(
                          height: 20,
                          width: 20,
                          child: CircularProgressIndicator(strokeWidth: 2),
                        )
                      : const Text('Login', style: TextStyle(fontSize: 16)),
                ),
                const SizedBox(height: 16),
                TextButton(
                  onPressed: _navigateToForgotPassword,
                  child: const Text('Forgot Password?'),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

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

  Future<void> _handleLogout(BuildContext context) async {
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('Logout'),
        content: const Text('Are you sure you want to logout?'),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context, false),
            child: const Text('Cancel'),
          ),
          TextButton(
            onPressed: () => Navigator.pop(context, true),
            child: const Text('Logout'),
          ),
        ],
      ),
    );

    if (confirmed != true) return;
    if (!context.mounted) return;

    await flutternext.logout();
    if (!context.mounted) return;
    
    Navigator.of(context).pushReplacement(
      MaterialPageRoute(builder: (_) => const LoginScreen()),
    );
  }

  void _navigateToChangePassword(BuildContext context) {
    Navigator.of(context).push(
      MaterialPageRoute(builder: (_) => const ChangePasswordScreen()),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Home'),
        actions: [
          IconButton(
            icon: const Icon(Icons.logout),
            onPressed: () => _handleLogout(context),
          ),
        ],
      ),
      body: FutureBuilder<UserProfile?>(
        future: flutternext.getUserProfile(),
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return const Center(child: CircularProgressIndicator());
          }

          if (snapshot.hasError) {
            return Center(
              child: Text('Error: ${snapshot.error}'),
            );
          }

          final user = snapshot.data;
          if (user == null) {
            return const Center(
              child: Text('No user data available'),
            );
          }

          return ListView(
            padding: const EdgeInsets.all(16),
            children: [
              Card(
                child: Padding(
                  padding: const EdgeInsets.all(16),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      const Text(
                        'Profile Information',
                        style: TextStyle(
                          fontSize: 20,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                      const SizedBox(height: 16),
                      _buildInfoRow('Username', user.username),
                      _buildInfoRow('Full Name', user.fullName ?? 'N/A'),
                      _buildInfoRow('Email', user.email ?? 'N/A'),
                    ],
                  ),
                ),
              ),
              const SizedBox(height: 16),
              ElevatedButton.icon(
                onPressed: () => _navigateToChangePassword(context),
                icon: const Icon(Icons.password),
                label: const Text('Change Password'),
              ),
            ],
          );
        },
      ),
    );
  }

  Widget _buildInfoRow(String label, String value) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 8),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 100,
            child: Text(
              '$label:',
              style: const TextStyle(fontWeight: FontWeight.bold),
            ),
          ),
          Expanded(
            child: Text(value),
          ),
        ],
      ),
    );
  }
}

class ForgotPasswordScreen extends StatefulWidget {
  const ForgotPasswordScreen({super.key});

  @override
  State<ForgotPasswordScreen> createState() => _ForgotPasswordScreenState();
}

class _ForgotPasswordScreenState extends State<ForgotPasswordScreen> {
  final _formKey = GlobalKey<FormState>();
  final _emailController = TextEditingController();
  bool _isLoading = false;

  @override
  void dispose() {
    _emailController.dispose();
    super.dispose();
  }

  Future<void> _handleResetPassword() async {
    if (!_formKey.currentState!.validate()) return;

    setState(() => _isLoading = true);

    final result = await flutternext.resetPassword(
      user: _emailController.text.trim(),
    );

    if (mounted) {
      setState(() => _isLoading = false);

      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(result.message ?? 'Request sent'),
          backgroundColor: result.success ? Colors.green : Colors.red,
        ),
      );

      if (result.success) {
        Navigator.pop(context);
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Forgot Password'),
      ),
      body: SafeArea(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(24.0),
          child: Form(
            key: _formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                const SizedBox(height: 48),
                const Icon(
                  Icons.email_outlined,
                  size: 80,
                  color: Colors.blue,
                ),
                const SizedBox(height: 24),
                const Text(
                  'Enter your email address and we\'ll send you instructions to reset your password.',
                  textAlign: TextAlign.center,
                ),
                const SizedBox(height: 48),
                TextFormField(
                  controller: _emailController,
                  keyboardType: TextInputType.emailAddress,
                  decoration: const InputDecoration(
                    labelText: 'Email',
                    border: OutlineInputBorder(),
                    prefixIcon: Icon(Icons.email),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Please enter your email';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 24),
                ElevatedButton(
                  onPressed: _isLoading ? null : _handleResetPassword,
                  style: ElevatedButton.styleFrom(
                    padding: const EdgeInsets.symmetric(vertical: 16),
                  ),
                  child: _isLoading
                      ? const SizedBox(
                          height: 20,
                          width: 20,
                          child: CircularProgressIndicator(strokeWidth: 2),
                        )
                      : const Text('Send Reset Link', style: TextStyle(fontSize: 16)),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

class ChangePasswordScreen extends StatefulWidget {
  const ChangePasswordScreen({super.key});

  @override
  State<ChangePasswordScreen> createState() => _ChangePasswordScreenState();
}

class _ChangePasswordScreenState extends State<ChangePasswordScreen> {
  final _formKey = GlobalKey<FormState>();
  final _oldPasswordController = TextEditingController();
  final _newPasswordController = TextEditingController();
  final _confirmPasswordController = TextEditingController();
  bool _isLoading = false;
  bool _obscureOld = true;
  bool _obscureNew = true;
  bool _obscureConfirm = true;

  @override
  void dispose() {
    _oldPasswordController.dispose();
    _newPasswordController.dispose();
    _confirmPasswordController.dispose();
    super.dispose();
  }

  Future<void> _handleChangePassword() async {
    if (!_formKey.currentState!.validate()) return;

    setState(() => _isLoading = true);

    final result = await flutternext.changePassword(
      oldPassword: _oldPasswordController.text,
      newPassword: _newPasswordController.text,
    );

    if (mounted) {
      setState(() => _isLoading = false);

      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(result.message ?? 'Password changed'),
          backgroundColor: result.success ? Colors.green : Colors.red,
        ),
      );

      if (result.success) {
        Navigator.pop(context);
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Change Password'),
      ),
      body: SafeArea(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(24.0),
          child: Form(
            key: _formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                const SizedBox(height: 24),
                TextFormField(
                  controller: _oldPasswordController,
                  obscureText: _obscureOld,
                  decoration: InputDecoration(
                    labelText: 'Current Password',
                    border: const OutlineInputBorder(),
                    prefixIcon: const Icon(Icons.lock),
                    suffixIcon: IconButton(
                      icon: Icon(_obscureOld ? Icons.visibility : Icons.visibility_off),
                      onPressed: () => setState(() => _obscureOld = !_obscureOld),
                    ),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Please enter your current password';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 16),
                TextFormField(
                  controller: _newPasswordController,
                  obscureText: _obscureNew,
                  decoration: InputDecoration(
                    labelText: 'New Password',
                    border: const OutlineInputBorder(),
                    prefixIcon: const Icon(Icons.lock_outline),
                    suffixIcon: IconButton(
                      icon: Icon(_obscureNew ? Icons.visibility : Icons.visibility_off),
                      onPressed: () => setState(() => _obscureNew = !_obscureNew),
                    ),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Please enter a new password';
                    }
                    if (value.length < 6) {
                      return 'Password must be at least 6 characters';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 16),
                TextFormField(
                  controller: _confirmPasswordController,
                  obscureText: _obscureConfirm,
                  decoration: InputDecoration(
                    labelText: 'Confirm New Password',
                    border: const OutlineInputBorder(),
                    prefixIcon: const Icon(Icons.lock_outline),
                    suffixIcon: IconButton(
                      icon: Icon(_obscureConfirm ? Icons.visibility : Icons.visibility_off),
                      onPressed: () => setState(() => _obscureConfirm = !_obscureConfirm),
                    ),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Please confirm your new password';
                    }
                    if (value != _newPasswordController.text) {
                      return 'Passwords do not match';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 24),
                ElevatedButton(
                  onPressed: _isLoading ? null : _handleChangePassword,
                  style: ElevatedButton.styleFrom(
                    padding: const EdgeInsets.symmetric(vertical: 16),
                  ),
                  child: _isLoading
                      ? const SizedBox(
                          height: 20,
                          width: 20,
                          child: CircularProgressIndicator(strokeWidth: 2),
                        )
                      : const Text('Change Password', style: TextStyle(fontSize: 16)),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}