payu_bharatkosh_encryption_wrapper 1.0.0-alpha.1

Flutter wrapper for BharatKosh encryption SDK that internally uses PayU CheckoutPro native SDKs for Android and iOS.

example/lib/main.dart

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

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'BharatKosh Encryption Wrapper Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(
          seedColor: const Color(0xFF00A86B),
          brightness: Brightness.light,
        ),
        useMaterial3: true,
        fontFamily: 'SF Pro Display',
      ),
      darkTheme: ThemeData(
        colorScheme: ColorScheme.fromSeed(
          seedColor: const Color(0xFF00A86B),
          brightness: Brightness.dark,
        ),
        useMaterial3: true,
      ),
      home: const PaymentPage(),
    );
  }
}

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

  @override
  State<PaymentPage> createState() => _PaymentPageState();
}

class _PaymentPageState extends State<PaymentPage> {
  // Default sample values from iOS sample app
  static const String _defaultEncryptedPayload = 
      "lxtLlNkazs3eF7p5ZvO2jpEuBB9T3UzD50t1S2xyQuY5FyGpmRXY0MEMfWEv2u7bfEhcWTQy9Cd4u7UowNanz60xenaIZAZoL0AsSKdWIK3WgE0yjvIzeWDJvJaOmhzF4/Jtu9OgMwU2Wn6ut+o0bvomrwv+Shpiz8DuuLK04aOk/kObh/0s0hWmVSMEs/PS0YtbxaMBQ56I0Gn2GGCd55NW+9bG4xmq3M1uFEmpvhavSn4vT/+GTc2iSilyQIRjz8Rzop8P3mdIP5Lh8CuIu0YstBe6VAMlQnCmg/Dn0chnLg7emLH+vithrlj3gnWTUh46CxP2k06r2lsx2T+A2ZBr3iDltAAs9sPxWpdU1/U=";
  
  static const String _defaultDigitalSignature = 
      "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";
  
  static const String _defaultMerchantId = "g9jmjm";

  final _encryptedPayloadController = TextEditingController(text: _defaultEncryptedPayload);
  final _digitalSignatureController = TextEditingController(text: _defaultDigitalSignature);
  final _merchantIdController = TextEditingController(text: _defaultMerchantId);
  
  bool _isProduction = false;
  bool _isLoading = false;
  String? _responseText;
  BharatkoshResultType? _resultType;

  final BharatkoshWrapper _wrapper = BharatkoshWrapper();

  @override
  void dispose() {
    _encryptedPayloadController.dispose();
    _digitalSignatureController.dispose();
    _merchantIdController.dispose();
    super.dispose();
  }

  Future<void> _startPaymentWithCallback() async {
    if (!_validateInputs()) return;

    setState(() {
      _isLoading = true;
      _responseText = null;
      _resultType = null;
    });

    _wrapper.startPayment(
      encRequestParameter: _encryptedPayloadController.text.trim(),
      reqDigitalSignature: _digitalSignatureController.text.trim(),
      merchIdVal: _merchantIdController.text.trim(),
      isProduction: _isProduction,
      callback: _PaymentCallback(
        onResult: (type, response) {
          if (mounted) {
            setState(() {
              _isLoading = false;
              _resultType = type;
              _responseText = response;
            });
            _showResultDialog(type, response);
          }
        },
      ),
    );
  }

  Future<void> _startPaymentAsync() async {
    if (!_validateInputs()) return;

    setState(() {
      _isLoading = true;
      _responseText = null;
      _resultType = null;
    });

    try {
      final result = await _wrapper.startPaymentAsync(
        encRequestParameter: _encryptedPayloadController.text.trim(),
        reqDigitalSignature: _digitalSignatureController.text.trim(),
        merchIdVal: _merchantIdController.text.trim(),
        isProduction: _isProduction,
      );

      if (mounted) {
        setState(() {
          _isLoading = false;
          _resultType = result.type;
          _responseText = result.encryptedResponse;
        });
        _showResultDialog(result.type, result.encryptedResponse);
      }
    } catch (e) {
      if (mounted) {
        setState(() {
          _isLoading = false;
          _resultType = BharatkoshResultType.error;
          _responseText = e.toString();
        });
        _showResultDialog(BharatkoshResultType.error, e.toString());
      }
    }
  }

  bool _validateInputs() {
    if (_encryptedPayloadController.text.trim().isEmpty) {
      _showSnackBar('Please enter encrypted payload');
      return false;
    }
    if (_digitalSignatureController.text.trim().isEmpty) {
      _showSnackBar('Please enter digital signature');
      return false;
    }
    if (_merchantIdController.text.trim().isEmpty) {
      _showSnackBar('Please enter merchant ID');
      return false;
    }
    return true;
  }

  void _showSnackBar(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text(message)),
    );
  }

  void _showResultDialog(BharatkoshResultType type, String response) {
    final color = _getResultColor(type);
    final icon = _getResultIcon(type);
    final title = _getResultTitle(type);

    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: Row(
          children: [
            Icon(icon, color: color),
            const SizedBox(width: 8),
            Text(title, style: TextStyle(color: color)),
          ],
        ),
        content: SingleChildScrollView(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            mainAxisSize: MainAxisSize.min,
            children: [
              const Text(
                'Encrypted Response:',
                style: TextStyle(fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 8),
              Container(
                padding: const EdgeInsets.all(12),
                decoration: BoxDecoration(
                  color: Colors.grey[100],
                  borderRadius: BorderRadius.circular(8),
                ),
                child: SelectableText(
                  response,
                  style: const TextStyle(
                    fontFamily: 'monospace',
                    fontSize: 12,
                  ),
                ),
              ),
            ],
          ),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('OK'),
          ),
        ],
      ),
    );
  }

  Color _getResultColor(BharatkoshResultType type) {
    switch (type) {
      case BharatkoshResultType.success:
        return Colors.green;
      case BharatkoshResultType.failure:
        return Colors.red;
      case BharatkoshResultType.cancel:
        return Colors.orange;
      case BharatkoshResultType.error:
        return Colors.red.shade800;
    }
  }

  IconData _getResultIcon(BharatkoshResultType type) {
    switch (type) {
      case BharatkoshResultType.success:
        return Icons.check_circle;
      case BharatkoshResultType.failure:
        return Icons.cancel;
      case BharatkoshResultType.cancel:
        return Icons.highlight_off;
      case BharatkoshResultType.error:
        return Icons.error;
    }
  }

  String _getResultTitle(BharatkoshResultType type) {
    switch (type) {
      case BharatkoshResultType.success:
        return 'Payment Success';
      case BharatkoshResultType.failure:
        return 'Payment Failed';
      case BharatkoshResultType.cancel:
        return 'Payment Cancelled';
      case BharatkoshResultType.error:
        return 'Error';
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('BharatKosh Payment'),
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // Header Card
            Card(
              child: Padding(
                padding: const EdgeInsets.all(16),
                child: Column(
                  children: [
                    Icon(
                      Icons.payment,
                      size: 48,
                      color: Theme.of(context).colorScheme.primary,
                    ),
                    const SizedBox(height: 8),
                    Text(
                      'BharatKosh Encryption Wrapper',
                      style: Theme.of(context).textTheme.titleLarge,
                    ),
                    const SizedBox(height: 4),
                    Text(
                      'Enter the encrypted payload from BharatKosh to start payment',
                      style: Theme.of(context).textTheme.bodySmall,
                      textAlign: TextAlign.center,
                    ),
                  ],
                ),
              ),
            ),
            const SizedBox(height: 16),

            // Input Fields
            TextField(
              controller: _encryptedPayloadController,
              decoration: const InputDecoration(
                labelText: 'Encrypted Payload',
                hintText: 'Enter encrypted request parameter',
                border: OutlineInputBorder(),
                prefixIcon: Icon(Icons.lock),
              ),
              maxLines: 3,
            ),
            const SizedBox(height: 16),

            TextField(
              controller: _digitalSignatureController,
              decoration: const InputDecoration(
                labelText: 'Digital Signature',
                hintText: 'Enter request digital signature',
                border: OutlineInputBorder(),
                prefixIcon: Icon(Icons.verified_user),
              ),
              maxLines: 2,
            ),
            const SizedBox(height: 16),

            TextField(
              controller: _merchantIdController,
              decoration: const InputDecoration(
                labelText: 'Merchant ID',
                hintText: 'Enter merchant ID value',
                border: OutlineInputBorder(),
                prefixIcon: Icon(Icons.business),
              ),
            ),
            const SizedBox(height: 16),

            // Environment Toggle
            Card(
              child: SwitchListTile(
                title: const Text('Production Environment'),
                subtitle: Text(
                  _isProduction
                      ? 'Using production servers'
                      : 'Using UAT/test servers',
                ),
                secondary: Icon(
                  _isProduction ? Icons.cloud : Icons.cloud_outlined,
                  color: _isProduction ? Colors.green : Colors.orange,
                ),
                value: _isProduction,
                onChanged: (value) {
                  setState(() {
                    _isProduction = value;
                  });
                },
              ),
            ),
            const SizedBox(height: 24),

            // Payment Buttons
            Row(
              children: [
                Expanded(
                  child: FilledButton.icon(
                    onPressed: _isLoading ? null : _startPaymentWithCallback,
                    icon: _isLoading
                        ? const SizedBox(
                            width: 20,
                            height: 20,
                            child: CircularProgressIndicator(strokeWidth: 2),
                          )
                        : const Icon(Icons.payment),
                    label: const Text('Pay (Callback)'),
                  ),
                ),
                const SizedBox(width: 8),
                Expanded(
                  child: FilledButton.tonal(
                    onPressed: _isLoading ? null : _startPaymentAsync,
                    child: const Text('Pay (Async)'),
                  ),
                ),
              ],
            ),
            const SizedBox(height: 24),

            // Result Display
            if (_resultType != null && _responseText != null)
              Card(
                color: _getResultColor(_resultType!).withOpacity(0.1),
                child: Padding(
                  padding: const EdgeInsets.all(16),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Row(
                        children: [
                          Icon(
                            _getResultIcon(_resultType!),
                            color: _getResultColor(_resultType!),
                          ),
                          const SizedBox(width: 8),
                          Text(
                            _getResultTitle(_resultType!),
                            style: TextStyle(
                              fontWeight: FontWeight.bold,
                              color: _getResultColor(_resultType!),
                            ),
                          ),
                        ],
                      ),
                      const SizedBox(height: 12),
                      const Text(
                        'Encrypted Response:',
                        style: TextStyle(fontWeight: FontWeight.w500),
                      ),
                      const SizedBox(height: 8),
                      Container(
                        padding: const EdgeInsets.all(12),
                        decoration: BoxDecoration(
                          color: Colors.white,
                          borderRadius: BorderRadius.circular(8),
                        ),
                        child: SelectableText(
                          _responseText!,
                          style: const TextStyle(
                            fontFamily: 'monospace',
                            fontSize: 11,
                          ),
                        ),
                      ),
                    ],
                  ),
                ),
              ),
          ],
        ),
      ),
    );
  }
}

/// Callback implementation for payment results.
class _PaymentCallback implements BharatkoshWrapperCallback {
  final void Function(BharatkoshResultType type, String response) onResult;

  _PaymentCallback({required this.onResult});

  @override
  void onSuccess(String encryptedResponse) {
    onResult(BharatkoshResultType.success, encryptedResponse);
  }

  @override
  void onFailure(String encryptedResponse) {
    onResult(BharatkoshResultType.failure, encryptedResponse);
  }

  @override
  void onCancel(String encryptedResponse) {
    onResult(BharatkoshResultType.cancel, encryptedResponse);
  }

  @override
  void onError(String encryptedResponse) {
    onResult(BharatkoshResultType.error, encryptedResponse);
  }
}