### Flutter OpenVPN Plugin Installation and Import

Source: https://gitlab.com/topfreelancerdeveloper/flutter_openvpn/-/blob/master/README.md

Instructions on how to add the flutter_openvpn plugin to your Flutter project's dependencies and import it into your Dart code. This is the first step to using the VPN functionality.

```dart
dependencies:
  flutter_openvpn: ^0.2.0

```

```dart
import 'package:flutter_openvpn/flutter_openvpn.dart';

```

--------------------------------

### iOS Podfile Configuration for OpenVPNAdapter

Source: https://gitlab.com/topfreelancerdeveloper/flutter_openvpn/-/blob/master/README.md

An example of how to modify your iOS Podfile to include the OpenVPNAdapter dependency. This is required for the Network Extension target to function correctly with the OpenVPN protocol.

```ruby
	target 'Runner' do
  use_frameworks!
  use_modular_headers!

  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
end

//Add this part
target 'YOUR_TARGET_EXTENSION_NAME' do
  use_frameworks!
  use_modular_headers!
  pod 'OpenVPNAdapter', :git => 'https://github.com/ss-abramchuk/OpenVPNAdapter.git', :tag => '0.7.0'
end

```

--------------------------------

### iOS Podfile for VPN Extension

Source: https://context7.com/topfreelancerdeveloper/flutter_openvpn/llms.txt

Configures the iOS Podfile to include the OpenVPNAdapter dependency for the VPN extension target. This setup is necessary for enabling VPN functionalities on iOS. It specifies the Git repository and tag for the OpenVPNAdapter pod and disables bitcode.

```ruby
# ios/Podfile

platform :ios, '9.0'

# Runner target (main app)
target 'Runner' do
  use_frameworks!
  use_modular_headers!

  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
end

# VPN Extension target
# Replace 'YOUR_TARGET_EXTENSION_NAME' with your actual extension name
target 'RunnerExtension' do
  use_frameworks!
  use_modular_headers!

  # OpenVPN adapter dependency
  pod 'OpenVPNAdapter', :git => 'https://github.com/ss-abramchuk/OpenVPNAdapter.git', :tag => '0.7.0'
end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)

    # Disable bitcode for all targets
    target.build_configurations.each do |config|
      config.build_settings['ENABLE_BITCODE'] = 'NO'
    end
  end
end
```

--------------------------------

### Initialize Flutter OpenVPN Plugin

Source: https://context7.com/topfreelancerdeveloper/flutter_openvpn/llms.txt

Initializes the Flutter OpenVPN plugin, setting up the native VPN service. It returns the current VPN status and requires iOS configuration (bundle identifier, localized description) which are optional on Android. Handles potential initialization failures.

```dart
import 'package:flutter_openvpn/flutter_openvpn.dart';

// Initialize plugin with iOS configuration
Future<void> initializeVPN() async {
  try {
    dynamic result = await FlutterOpenvpn.init(
      localizedDescription: "MyApp VPN",
      providerBundleIdentifier: "com.example.myapp.VPNExtension",
    );

    if (result != null) {
      print("VPN initialized successfully");
      print("Current Status: ${result['currentStatus']}");
      print("Expires At: ${result['expireAt']}");
      // Output: Current Status: DISCONNECTED
      // Output: Expires At: null (or date string if active)
    } else {
      print("VPN initialization failed");
    }
  } catch (e) {
    print("Error initializing VPN: $e");
  }
}
```

--------------------------------

### Connect to VPN using FlutterOpenVPN

Source: https://gitlab.com/topfreelancerdeveloper/flutter_openvpn/-/blob/master/README.md

Dart code demonstrating how to initiate a VPN connection using the flutter_openvpn plugin. It takes the .ovpn file content and provides callbacks for profile loading and VPN status changes. An optional expiry duration can be set.

```dart
FlutterOpenvpn.lunchVpn(
          ovpnFileContent, //content of your .ovpn file
          (isProfileLoaded) => print('isProfileLoaded : $isProfileLoaded'),
          (newVpnStatus) => print('vpnActivated : $newVpnStatus'),
          expireAt: DateTime.now().add(Duration(seconds: 30)),
	  //(Optional) VPN automatically disconnects in next 30 seconds
         )

```

--------------------------------

### Build Commands for Flutter OpenVPN Plugin

Source: https://gitlab.com/topfreelancerdeveloper/flutter_openvpn/-/blob/master/README.md

Commands to build your Flutter project after adding the OpenVPN package. These commands are necessary to ensure the native integrations are compiled correctly for Android and iOS.

```bash
flutter build apk --debug //for android
flutter build ios --no-codesign //for ios

```

--------------------------------

### Initialize FlutterOpenVPN Plugin

Source: https://gitlab.com/topfreelancerdeveloper/flutter_openvpn/-/blob/master/README.md

Dart code to initialize the flutter_openvpn plugin. This function requires iOS-specific parameters like localizedDescription and providerBundleIdentifier for setting up the VPN profile.

```dart
FlutterOpenvpn.init(
          localizedDescription: "ExampleVPN", //this is required only on iOS
          providerBundleIdentifier: "com.topfreelancerdeveloper.flutterOpenvpnExample.RunnerExtension",//this is required only on iOS
	  //localizedDescription is the name of your VPN profile
	  //providerBundleIdentifier is the bundle id of your vpn extension
)
/* returns {"currentStatus" : "VPN_CURRENT_STATUS",
	   "expireAt" : "VPN_EXPIRE_DATE_STRING_IN_FORMAT(yyyy-MM-dd HH:mm:ss)",} if successful
 returns null if failed
*/

```

--------------------------------

### Launch Flutter OpenVPN Connection

Source: https://context7.com/topfreelancerdeveloper/flutter_openvpn/llms.txt

Launches a VPN connection using an OpenVPN configuration file or string. It provides callbacks for profile loading, VPN status changes, and connection statistics. Supports optional username/password authentication and automatic disconnection via 'expireAt'.

```dart
import 'package:flutter/services.dart' show rootBundle;
import 'package:flutter_openvpn/flutter_openvpn.dart';

Future<void> connectVPN() async {
  // Load .ovpn configuration file
  String ovpnConfig = await rootBundle.loadString('assets/client.ovpn');

  // Alternatively, load from string
  // String ovpnConfig = """
  // client
  // dev tun
  // proto udp
  // remote vpn.example.com 1194
  // resolv-retry infinite
  // nobind
  // ...
  // """;

  // Launch VPN with all callbacks
  int resultCode = await FlutterOpenvpn.lunchVpn(
    ovpnConfig,
    // Profile loading callback
    (bool isProfileLoaded) {
      if (isProfileLoaded) {
        print("VPN profile loaded successfully");
      } else {
        print("Failed to load VPN profile");
      }
    },
    // VPN status change callback
    (String status) {
      print("VPN Status Changed: $status");
      // Possible values: CONNECTING, CONNECTED, DISCONNECTING,
      // DISCONNECTED, INVALID, REASSERTING, AUTH
      switch (status) {
        case "CONNECTED":
          print("VPN is now connected");
          break;
        case "DISCONNECTED":
          print("VPN is disconnected");
          break;
        case "CONNECTING":
          print("VPN is connecting...");
          break;
      }
    },
    // Optional: Username and password for authentication
    user: 'vpnuser',
    pass: 'vpnpassword',
    // Optional: Connection statistics callback
    onConnectionStatusChanged: (String duration, String lastPacketReceive,
                                 String byteIn, String byteOut) {
      print("Connection Duration: $duration");
      print("Last Packet: $lastPacketReceive");
      print("Downloaded: $byteIn bytes");
      print("Uploaded: $byteOut bytes");
    },
    // Optional: Auto-disconnect after specified time
    expireAt: DateTime.now().add(Duration(hours: 2)),
  );

  // Handle error codes
  if (resultCode == 0) {
    print("VPN launched successfully");
  } else if (resultCode == -1) {
    print("Error: Plugin not initialized");
  } else if (resultCode == -2) {
    print("Error: Empty or null VPN config");
  }
}
```

--------------------------------

### Flutter VPN Manager Implementation with flutter_openvpn

Source: https://context7.com/topfreelancerdeveloper/flutter_openvpn/llms.txt

This Dart code implements a complete VPN manager for a Flutter application. It initializes the VPN service, handles connection and disconnection logic, displays VPN status and connection statistics, and includes basic error handling. The UI is built using Flutter widgets, and it relies on the `flutter_openvpn` package for VPN functionalities.

```dart
import 'package:flutter/material.dart';
import 'package:flutter_openvpn/flutter_openvpn.dart';

class VPNManager extends StatefulWidget {
  @override
  _VPNManagerState createState() => _VPNManagerState();
}

class _VPNManagerState extends State<VPNManager> {
  String _vpnStatus = "DISCONNECTED";
  bool _isInitialized = false;
  String _connectionStats = "";

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

  Future<void> _initializeVPN() async {
    dynamic result = await FlutterOpenvpn.init(
      localizedDescription: "MyApp VPN",
      providerBundleIdentifier: "com.example.myapp.VPNExtension",
    );

    if (result != null) {
      setState(() {
        _isInitialized = true;
        _vpnStatus = result['currentStatus'] ?? "DISCONNECTED";
      });
    }
  }

  Future<void> _connect() async {
    if (!_isInitialized) {
      _showError("VPN not initialized");
      return;
    }

    String ovpnConfig = """
client
dev tun
proto udp
remote vpn.example.com 1194
resolv-retry infinite
nobind
persist-key
persist-tun
remote-cert-tls server
cipher AES-256-CBC
auth SHA256
comp-lzo
verb 3
<ca>
-----BEGIN CERTIFICATE-----
...your certificate...
-----END CERTIFICATE-----
</ca>
""";

    await FlutterOpenvpn.lunchVpn(
      ovpnConfig,
      (isLoaded) {
        if (!isLoaded) {
          _showError("Failed to load VPN profile");
        }
      },
      (status) {
        setState(() {
          _vpnStatus = status;
        });

        if (status == "CONNECTED") {
          _showMessage("VPN Connected Successfully");
        }
      },
      user: 'username',
      pass: 'password',
      onConnectionStatusChanged: (duration, lastPacket, byteIn, byteOut) {
        setState(() {
          _connectionStats = "Duration: $duration\n" 
                           "Download: ${_formatBytes(byteIn)}\n" 
                           "Upload: ${_formatBytes(byteOut)}";
        });
      },
      expireAt: DateTime.now().add(Duration(hours: 24)),
    );
  }

  Future<void> _disconnect() async {
    await FlutterOpenvpn.stopVPN();
    setState(() {
      _vpnStatus = "DISCONNECTED";
      _connectionStats = "";
    });
  }

  String _formatBytes(String bytes) {
    try {
      int byteCount = int.parse(bytes);
      if (byteCount < 1024) return "$byteCount B";
      if (byteCount < 1048576) return "${(byteCount / 1024).toStringAsFixed(2)} KB";
      return "${(byteCount / 1048576).toStringAsFixed(2)} MB";
    } catch (e) {
      return bytes;
    }
  }

  void _showError(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text(message), backgroundColor: Colors.red),
    );
  }

  void _showMessage(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text(message), backgroundColor: Colors.green),
    );
  }

  @override
  Widget build(BuildContext context) {
    bool isConnected = _vpnStatus == "CONNECTED";
    bool isConnecting = _vpnStatus == "CONNECTING";

    return Scaffold(
      appBar: AppBar(title: Text("VPN Manager")),
      body: Padding(
        padding: EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            Card(
              child: Padding(
                padding: EdgeInsets.all(16.0),
                child: Column(
                  children: [
                    Text("Status: $_vpnStatus",
                        style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
                    SizedBox(height: 10),
                    if (_connectionStats.isNotEmpty)
                      Text(_connectionStats, style: TextStyle(fontSize: 14)),
                  ],
                ),
              ),
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: isConnecting ? null : (isConnected ? _disconnect : _connect),
              style: ElevatedButton.styleFrom(
                backgroundColor: isConnected ? Colors.red : Colors.green,
                padding: EdgeInsets.symmetric(vertical: 16),
              ),
              child: Text(
                isConnecting ? "CONNECTING..." : (isConnected ? "DISCONNECT" : "CONNECT"),
                style: TextStyle(fontSize: 16),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

```

--------------------------------

### Android FlutterOpenVPN Plugin Import

Source: https://gitlab.com/topfreelancerdeveloper/flutter_openvpn/-/blob/master/README.md

The import statement required in your Android Java or Kotlin activity file to use the FlutterOpenvpnPlugin class. This allows your app to interact with the native VPN functionality.

```java
import com.topfreelancerdeveloper.flutter_openvpn.FlutterOpenvpnPlugin;

```

--------------------------------

### Android VPN Permission Handling

Source: https://context7.com/topfreelancerdeveloper/flutter_openvpn/llms.txt

Configures the Android MainActivity to handle VPN permission requests from the user. This is crucial for the VPN service to obtain the necessary permissions. It checks the result of the permission request and updates the plugin's permission status accordingly.

```java
// MainActivity.java
// Location: android/app/src/main/YOUR_PACKAGE_NAME/MainActivity.java

import android.os.Bundle;
import io.flutter.embedding.android.FlutterActivity;
import com.topfreelancerdeveloper.flutter_openvpn.FlutterOpenvpnPlugin;
import android.content.Intent;

public class MainActivity extends FlutterActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        // Handle VPN permission result
        if (requestCode == 1) {
            if (resultCode == RESULT_OK) {
                // User granted VPN permission
                FlutterOpenvpnPlugin.setPermission(true);
            } else {
                // User denied VPN permission
                FlutterOpenvpnPlugin.setPermission(false);
            }
        }
    }
}
```

--------------------------------

### Android Activity Result Handling for Flutter OpenVPN

Source: https://gitlab.com/topfreelancerdeveloper/flutter_openvpn/-/blob/master/README.md

Java code snippet for overriding the onActivityResult method in your MainActivity.java to handle permission results from the FlutterOpenvpn plugin. This is crucial for VPN permission management on Android.

```java
if (requestCode == 1) {
    if (resultCode == RESULT_OK) {
        FlutterOpenvpnPlugin.setPermission(true);
    } else {
        FlutterOpenvpnPlugin.setPermission(false);
    }
}

```

--------------------------------

### Stop VPN Connection (Dart)

Source: https://context7.com/topfreelancerdeveloper/flutter_openvpn/llms.txt

Disconnects and stops any active VPN session initiated by Flutter OpenVPN. This method immediately terminates the VPN tunnel and returns the device to its normal network state. It handles potential errors during the disconnection process.

```dart
import 'package:flutter/material.dart';
import 'package:flutter_openvpn/flutter_openvpn.dart';

Future<void> disconnectVPN() async {
  try {
    await FlutterOpenvpn.stopVPN();
    print("VPN disconnected successfully");
  } catch (e) {
    print("Error stopping VPN: $e");
  }
}

// Example: Disconnect with user confirmation
Future<void> disconnectWithConfirmation(BuildContext context) async {
  bool shouldDisconnect = await showDialog(
    context: context,
    builder: (context) => AlertDialog(
      title: Text("Disconnect VPN"),
      content: Text("Are you sure you want to disconnect?"),
      actions: [
        TextButton(
          onPressed: () => Navigator.pop(context, false),
          child: Text("Cancel"),
        ),
        TextButton(
          onPressed: () => Navigator.pop(context, true),
          child: Text("Disconnect"),
        ),
      ],
    ),
  );

  if (shouldDisconnect == true) {
    await FlutterOpenvpn.stopVPN();
  }
}
```

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