🛡️ LogGuard #

A high-performance Flutter plugin that automatically sanitizes sensitive data in logs using Rust FFI with regex-based pattern matching.

⚡ Features #

• Automatic Sanitization: Intercepts print() and debugPrint() calls
• High Performance: Rust FFI implementation with optimized regex patterns
• Zero Config: Works out of the box with sensible defaults
• UTF-8 Support: Handles international characters correctly
• Streaming Support: Efficiently processes large log messages

🔒 What Gets Sanitized? #

LogGuard automatically masks the following sensitive patterns:

📦 Installation #

Add to your pubspec.yaml:

dependencies:
  logguard: ^0.1.0

Then run:

flutter pub get

🚀 Quick Start #

Protect Your Entire App #

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

void main() {
  LogGuard.runApp(
    enable: true, // enable / disable sanitize
    MaterialApp(
      home: MyHomePage(),
    ),
  );
}

That's it! All print() and debugPrint() calls are now automatically sanitized.

Protect Specific Code Blocks #

void main() async {
  await LogGuard.runGuarded(() {
    // Your code here
    print('User password: secret123'); // Automatically sanitized
    runApp(MyApp());
  });
}

Manual Sanitization #

import 'package:logguard/logguard.dart';

void logUserInfo(String email, String token) {
  // Manual sanitization
  final safeEmail = LogGuard.sanitize(email);
  print('User email: $safeEmail');

  // Or use extension
  print('Auth token: ${token.sanitized}');

  // Safe logging with levels
  LogGuard.log(
    'User logged in with $email',
    level: LogLevel.info,
    toConsole: true,
    toDeveloper: true,
  );
}

Advanced Usage #

// Custom log levels
LogGuard.log(
  'Critical error occurred',
  level: LogLevel.error,
  error: exception,
  stackTrace: stackTrace,
  name: 'MyService',
);

// Safe print helpers
LogGuard.safePrint('This will be sanitized');
LogGuard.safeDebug('Debug message', wrapWidth: 80);

// Check FFI availability
if (LogGuard.isFFIAvailable) {
  print('Using high-performance Rust sanitizer');
} else {
  print('Using Dart fallback sanitizer');
}

// String extension
final sensitive = 'password=abc123';
final safe = sensitive.sanitized;
print(safe); // Output: password=********

🏗️ Architecture #

┌─────────────────────────────────────────┐
│         Flutter Application             │
│  (print, debugPrint, custom logs)       │
└──────────────┬──────────────────────────┘
               │
               ▼
┌─────────────────────────────────────────┐
│        LogGuard Dart Layer              │
│  • Zone interception                    │
│  • Hook management                      │
│  • Fallback logic                       │
└──────────────┬──────────────────────────┘
               │
               ▼
┌─────────────────────────────────────────┐
│         Rust FFI Bridge                 │
│  • Native performance                   │
│  • Optimized regex                      │
│  • UTF-8 aware scanning                 │
│  • Streaming support                    │
└─────────────────────────────────────────┘

🎯 Platform Support #

⚙️ Configuration #

LogGuard works with zero configuration, but you can customize behavior:

// Setup hooks manually
LogGuard.setupHooks();

// Remove hooks when needed
LogGuard.removeHooks();

// Use streaming for very large logs (>10KB)
// Automatically handled internally

📊 Performance #

LogGuard is designed for production use with minimal overhead:

• Small messages (<10KB): Single-pass scanning
• Large messages (>10KB): Automatic chunking with 10KB threshold
• Regex patterns: Lazy-loaded and cached
• UTF-8 aware: Proper character boundary handling
• Memory safe: Capped result buffer (2MB max)

Benchmarks (on Pixel 6):

• 1KB log: ~0.1ms
• 10KB log: ~0.5ms
• 100KB log: ~3ms (chunked)

🤝 Contributing #

Contributions are welcome! Please feel free to submit a Pull Request. For major changes, please open an issue first to discuss what you would like to change.

Roadmap #

• ✅ Android support with Rust FFI
• ❌ Linux support
• ❌ Windows support
• ❌ iOS support
• ❌ macOS support
• ❌ Web support (WASM)
• ❌ Custom pattern configuration
• ❌ Log encryption option
• ❌ Analytics integration

📄 License #

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments #

• Built with Rust for native performance
• Regex patterns optimized using regex crate
• Inspired by security best practices from OWASP

📞 Support #

• 🐛 Report a bug
• 💡 Request a feature

⚠️ Security Notice: While LogGuard significantly reduces the risk of sensitive data exposure in logs, it should be used as part of a comprehensive security strategy. Always follow security best practices and never intentionally log sensitive information.