Security Implementation Example

Complete Security Implementation Example

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:alphyn_sdk/alphyn_sdk.dart';

class SecureApp extends StatefulWidget {
  @override
  _SecureAppState createState() => _SecureAppState();
}

class _SecureAppState extends State<SecureApp> {
  SecurityLevel _securityLevel = SecurityLevel.unknown;
  List<String> _threats = [];
  bool _isMonitoring = false;

  @override
  void initState() {
    super.initState();
    _initializeSecurity();
  }

  Future<void> _initializeSecurity() async {
    try {
      // Check if SDK is initialized
      final isInitialized = await AlphynSdk.isInitialized();

      if (isInitialized != true) {
        setState(() {
          _securityLevel = SecurityLevel.initializationError;
        });
        return;
      }

      // Perform initial security check
      await _performSecurityCheck();

      // Start continuous monitoring
      _startContinuousMonitoring();
    } catch (e) {
      print('Security initialization error: $e');
      setState(() {
        _securityLevel = SecurityLevel.initializationError;
      });
    }
  }

  Future<void> _performSecurityCheck() async {
    try {
      // getRejectReasons() returns a newline-separated string; split it into a list
      final rejectReasonsRaw = await AlphynSdk.getRejectReasons();
      final rejectReasons = rejectReasonsRaw.split('\n').where((line) => line.trim().isNotEmpty).toList();
      final result = await AlphynSdk.getScanResult();

      setState(() {
        _threats = rejectReasons;
        _securityLevel = _determineSecurityLevel(rejectReasons, result);
      });

      _applySecurityPolicy(_securityLevel);
    } catch (e) {
      print('Security check error: $e');
    }
  }

  SecurityLevel _determineSecurityLevel(List<String> threats, String? result) {
    // Device is trusted if no threats detected
    if (threats.isEmpty) {
      return SecurityLevel.trusted;
    } else if (threats.length < 3) {
      return SecurityLevel.flagged;
    } else {
      return SecurityLevel.untrusted;
    }
  }

  void _applySecurityPolicy(SecurityLevel level) {
    switch (level) {
      case SecurityLevel.trusted:
        print('✅ Security Policy: Full Access');
        break;
      case SecurityLevel.flagged:
        print('⚠️ Security Policy: Restricted Access');
        _showSecurityWarning();
        break;
      case SecurityLevel.untrusted:
        print('🚨 Security Policy: Critical Restriction');
        _showCriticalAlert();
        break;
      case SecurityLevel.unknown:
      case SecurityLevel.initializationError:
        print('❓ Security Policy: Unable to determine');
        break;
    }
  }

  void _startContinuousMonitoring() {
    if (_isMonitoring) return;

    _isMonitoring = true;
    Timer.periodic(const Duration(minutes: 5), (timer) {
      if (!mounted) {
        timer.cancel();
        return;
      }
      _performSecurityCheck();
    });
  }

  void _showSecurityWarning() {
    if (!mounted) return;

    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Row(
          children: [
            Icon(Icons.warning_amber, color: Colors.orange),
            SizedBox(width: 8),
            Text('Security Notice'),
          ],
        ),
        content: Text(
          'Security concerns detected:\n\n${_threats.join('\n')}',
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('Acknowledge'),
          ),
        ],
      ),
    );
  }

  void _showCriticalAlert() {
    if (!mounted) return;

    showDialog(
      context: context,
      barrierDismissible: false,
      builder: (context) => AlertDialog(
        title: const Row(
          children: [
            Icon(Icons.error, color: Colors.red),
            SizedBox(width: 8),
            Text('Critical Security Alert'),
          ],
        ),
        content: Text(
          'Critical security violations detected:\n\n${_threats.join('\n')}\n\n'
          'Sensitive features have been disabled for your protection.',
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('I Understand'),
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Secure Application'),
        backgroundColor: _getSecurityColor(),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(
              _getSecurityIcon(),
              size: 64,
              color: _getSecurityColor(),
            ),
            const SizedBox(height: 16),
            Text(
              _securityLevel.displayName,
              style: Theme.of(context).textTheme.headlineMedium,
            ),
            if (_threats.isNotEmpty) ...[
              const SizedBox(height: 24),
              Text(
                'Threats detected: ${_threats.length}',
                style: Theme.of(context).textTheme.bodyLarge,
              ),
            ],
          ],
        ),
      ),
    );
  }

  Color _getSecurityColor() {
    switch (_securityLevel) {
      case SecurityLevel.trusted:
        return Colors.green;
      case SecurityLevel.flagged:
        return Colors.orange;
      case SecurityLevel.untrusted:
        return Colors.red;
      default:
        return Colors.grey;
    }
  }

  IconData _getSecurityIcon() {
    switch (_securityLevel) {
      case SecurityLevel.trusted:
        return Icons.verified_user;
      case SecurityLevel.flagged:
        return Icons.warning;
      case SecurityLevel.untrusted:
        return Icons.dangerous;
      default:
        return Icons.help;
    }
  }
}

enum SecurityLevel {
  trusted,
  flagged,
  untrusted,
  unknown,
  initializationError;

  String get displayName {
    switch (this) {
      case SecurityLevel.trusted:
        return 'Trusted';
      case SecurityLevel.flagged:
        return 'Flagged';
      case SecurityLevel.untrusted:
        return 'Untrusted';
      case SecurityLevel.unknown:
        return 'Unknown';
      case SecurityLevel.initializationError:
        return 'Initialization Error';
    }
  }
}