Flutter Liveness Detection Randomized Plugin

A Flutter plugin for liveness detection with randomized challenge response method with an interaction mechanism between the user and the system in the form of a movement challenge that indicates life is detected on the face. This plugin helps implement secure biometric authentication by detecting real human presence through dynamic facial verification challenges.

Author

Crafted with love by Bagus Subagja ❤️

Feel free to fork and modify this package to suit your needs - that's much more enjoyable than stealing or claiming my code 😊

Preview 🪟

flutter-liveness-detection-randomized-plugin.mp4

Update 1.1.0

• ⏱️ Added automatic cooldown feature after 3 failed verification attempts
• 🔒 10-minute waiting period with persistent countdown (survives app restarts)
• 🎯 Countdown only decreases when app is active (pauses when app is backgrounded)
• 🔄 API Refactor: All parameters consolidated into LivenessDetectionConfig
• 🎯 Simplified API - only requires context and config parameters
• 🛠️ Fixed customizedLabel logic for proper skip challenge behavior
• ✅ Added validation: customizedLabel must not be null when useCustomizedLabel is true

Update 1.0.6

Face stretching already fixed on this version

Features ✨

• 📱 Real-time face detection
• 🎲 Randomized challenge sequence generation
• 💫 Cross-platform support (iOS & Android)
• 🎨 Light and dark mode support
• ✅ High accuracy liveness verification
• 🚀 Simple integration API
• 🎭 Customizable liveness challenge labels
• ⏳ Flexible security verification duration
• 🎲 Adjustable number of liveness challenges
• 🛠️ Adjustable image quality result
• ⏱️ Automatic cooldown after failed attempts

Getting Started 🌟

Add this to your package's pubspec.yaml file:

dependencies:
  flutter_liveness_detection_randomized_plugin: ^1.1.0

Usage 🚀

final String? response = await FlutterLivenessDetectionRandomizedPlugin.instance.livenessDetection(
  context: context,
  config: LivenessDetectionConfig(
    // Camera & Image Settings
    cameraResolution: ResolutionPreset.medium, // Camera resolution
    imageQuality: 100, // Image quality (0-100)
    isEnableMaxBrightness: true, // Auto brightness adjustment
    
    // Detection Settings
    durationLivenessVerify: 60, // Detection timeout in seconds
    showDurationUiText: false, // Show countdown timer
    startWithInfoScreen: true, // Show tutorial screen
    
    // UI Settings
    isDarkMode: false, // Dark/light theme
    showCurrentStep: true, // Show step counter
    isEnableSnackBar: true, // Show result notifications
    shuffleListWithSmileLast: true, // Randomize challenges with smile last
    
    // Customization
    useCustomizedLabel: false, // Enable custom labels
    customizedLabel: LivenessDetectionLabelModel(
      blink: '', // Empty string = skip challenge
      lookDown: '', // Skip this challenge
      lookLeft: null, // null = use default "Look LEFT"
      lookRight: 'Turn Right', // Custom label
      lookUp: 'Look Up Please', // Custom label
      smile: null, // null = use default "Smile"
    ),
    
    // Security Features
    enableCooldownOnFailure: true, // Enable cooldown after failures
    maxFailedAttempts: 3, // Failed attempts before cooldown
    cooldownMinutes: 10, // Cooldown duration
  ),
);

Configuration Parameters 📋

Camera & Image Settings

• cameraResolution: Camera quality (ResolutionPreset.low/medium/high)
• imageQuality: Output image quality 0-100 (default: 100)
• isEnableMaxBrightness: Auto brightness adjustment (default: true)

Detection Settings

• durationLivenessVerify: Detection timeout in seconds (default: 45)
• showDurationUiText: Show countdown timer (default: false)
• startWithInfoScreen: Show tutorial before detection (default: false)

UI Settings

• isDarkMode: Dark theme mode (default: true)
• showCurrentStep: Show current step number (default: false)
• isEnableSnackBar: Show success/failure notifications (default: true)
• shuffleListWithSmileLast: Randomize challenges with smile at end (default: true)

Customization

• useCustomizedLabel: Enable custom challenge labels (default: false)
• customizedLabel: Custom labels for each challenge type

Security Features

• enableCooldownOnFailure: Enable cooldown after failed attempts (default: true)
• maxFailedAttempts: Number of failures before cooldown (default: 3)
• cooldownMinutes: Cooldown duration in minutes (default: 10)

Cooldown Feature

The plugin includes an automatic cooldown mechanism to prevent brute force attempts:

• Configurable number of failed attempts before cooldown
• Configurable cooldown duration
• Countdown timer only decreases when app is active
• Cooldown state persists through app restarts
• Users see a countdown screen during cooldown period

Customized Steps Label

You can customize challenge labels or skip certain challenges:

• Use empty string '' to skip a challenge
• Use null to keep default label
• Provide custom string for personalized labels
• When useCustomizedLabel: true, customizedLabel must not be null

Complete Example 💡

import 'package:flutter_liveness_detection_randomized_plugin/index.dart';

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: ElevatedButton(
            onPressed: () async {
              final result = await FlutterLivenessDetectionRandomizedPlugin.instance.livenessDetection(
                context: context,
                config: LivenessDetectionConfig(
                  startWithInfoScreen: true,
                  isDarkMode: false,
                  showCurrentStep: true,
                  isEnableSnackBar: true,
                ),
              );
              
              if (result != null) {
                // Liveness detection successful
                print('Face captured: $result');
              } else {
                // Detection failed or cancelled
                print('Detection failed');
              }
            },
            child: Text('Start Liveness Detection'),
          ),
        ),
      ),
    );
  }
}

Platform Setup

Android

Add camera permission to your android/app/src/main/AndroidManifest.xml:

<uses-permission android:name="android.permission.CAMERA"/>

Minimum SDK version: 23

iOS

Add camera usage description to ios/Runner/Info.plist:

<key>NSCameraUsageDescription</key>
<string>Camera access is required for liveness detection</string>

Testing Scenarios 🧪

The example app includes 8 comprehensive liveness scenarios to test all features:

Scenario 1: Default Configuration

LivenessDetectionConfig(
  shuffleListWithSmileLast: true,
  startWithInfoScreen: true,
  // Standard settings
)

Scenario 2: Random Shuffle

LivenessDetectionConfig(
  shuffleListWithSmileLast: false,
  durationLivenessVerify: 30,
  startWithInfoScreen: false,
)

Scenario 3: Dark Mode + High Resolution

LivenessDetectionConfig(
  isDarkMode: true,
  cameraResolution: ResolutionPreset.high,
  durationLivenessVerify: 60,
)

Scenario 4: Custom Indonesian Labels

LivenessDetectionConfig(
  useCustomizedLabel: true,
  customizedLabel: LivenessDetectionLabelModel(
    blink: 'Kedip 2-3 Kali',
    lookUp: 'Lihat ke Atas',
    smile: 'Tersenyum Lebar',
  ),
)

Scenario 5: Skip Steps (Minimal Challenges)

LivenessDetectionConfig(
  useCustomizedLabel: true,
  customizedLabel: LivenessDetectionLabelModel(
    blink: 'Blink Eyes',
    lookDown: '', // Skip
    lookLeft: '', // Skip  
    lookRight: '', // Skip
    lookUp: 'Look Up Please',
    smile: 'Smile Wide',
  ),
)

Scenario 6: Timer + Cooldown Features

LivenessDetectionConfig(
  showDurationUiText: true,
  enableCooldownOnFailure: true,
  maxFailedAttempts: 2,
  cooldownMinutes: 5,
)

Scenario 7: Minimal Features

LivenessDetectionConfig(
  isEnableMaxBrightness: false,
  isEnableSnackBar: false,
  showCurrentStep: false,
)

Scenario 8: All Features Enabled

LivenessDetectionConfig(
  isDarkMode: true,
  cameraResolution: ResolutionPreset.high,
  showDurationUiText: true,
  enableCooldownOnFailure: true,
  useCustomizedLabel: true,
  customizedLabel: LivenessDetectionLabelModel(
    blink: '👁️ Kedipkan Mata',
    smile: '😊 Senyum Manis',
  ),
)

Migration Guide 🔄

From v1.0.x to v1.1.0+

All parameters are now consolidated into the LivenessDetectionConfig object:

Before:

await plugin.livenessDetection(
  context: context,
  config: LivenessDetectionConfig(...),
  isEnableSnackBar: true,
  shuffleListWithSmileLast: true,
  showCurrentStep: true,
  isDarkMode: false,
);

After:

await plugin.livenessDetection(
  context: context,
  config: LivenessDetectionConfig(
    isEnableSnackBar: true,
    shuffleListWithSmileLast: true,
    showCurrentStep: true,
    isDarkMode: false,
    // ... other parameters
  ),
);