Auto detect server

Client/phonegap-wake-on-lan/src/WakeOnLan.java

@@ -0,0 +1,89 @@
+package com.matlipe;
+
+import org.apache.cordova.CordovaPlugin;
+import org.apache.cordova.CallbackContext;
+
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+public class WakeOnLan extends CordovaPlugin {
+
+	private static final String WAKE_ACTION = "wake";
+	private static final int PORT = 9;
+
+
+	@Override
+	public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException {
+		boolean result = false;
+		if( WAKE_ACTION.equals( action ) ){
+			if( wake( args ) ){
+				callbackContext.success( "Device has been woken up" );
+				result = true;
+			} else {
+				callbackContext.error( "Device did not wake up" );
+			}
+		} else {
+			callbackContext.error( "Invalid action : " + action + " passed" );
+		}
+
+		return result;
+	}
+
+
+	private Boolean wake( JSONArray args ) {
+		Boolean result = false;
+		try{
+			String ipStr = args.getString( 0 );
+			String macStr = args.getString( 1 );
+
+
+			byte[] macBytes = getMacBytes( macStr );
+			byte[] bytes = new byte[ 6 + 16 * macBytes.length ];
+
+			for( int i = 0; i < 6; i++ ){
+				bytes[ i ] = ( byte ) 0xff;
+			}
+			for( int i = 6; i < bytes.length; i += macBytes.length ){
+				System.arraycopy( macBytes, 0, bytes, i, macBytes.length );
+			}
+
+			InetAddress address = InetAddress.getByName( ipStr );
+			DatagramPacket packet = new DatagramPacket( bytes, bytes.length, address, PORT );
+			DatagramSocket socket = new DatagramSocket();
+			socket.send( packet );
+			socket.close();
+
+			System.out.println( "Wake-on-LAN packet sent." );
+
+			result = true;
+		} catch( Exception e ){
+			System.out.println( "WakeOnLan Exception thrown" + e.toString() );
+		}
+
+		return result;
+
+	}
+
+
+	private byte[] getMacBytes( String macStr ) throws IllegalArgumentException {
+		byte[] bytes = new byte[ 6 ];
+		String[] hex = macStr.split( "(\\:|\\-)" );
+		if( hex.length != 6 ){
+			throw new IllegalArgumentException( "Invalid MAC address." );
+		}
+		try{
+			for( int i = 0; i < 6; i++ ){
+				bytes[ i ] = ( byte ) Integer.parseInt( hex[ i ], 16 );
+			}
+		} catch( NumberFormatException e ){
+			throw new IllegalArgumentException( "Invalid hex digit in MAC address." );
+		}
+		return bytes;
+	}
+
+}