FuckOffPlugin.java

package co.ryred.fuckoff;

import java.lang.reflect.Field;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.locks.ReadWriteLock;

import com.google.common.base.Charsets;

import net.md_5.bungee.BungeeCord;
import net.md_5.bungee.UserConnection;
import net.md_5.bungee.api.event.PlayerDisconnectEvent;
import net.md_5.bungee.api.plugin.Listener;
import net.md_5.bungee.api.plugin.Plugin;
import net.md_5.bungee.event.EventHandler;

public class FuckOffPlugin extends Plugin implements Listener {

	@Override
	public void onEnable() {
		getProxy().getPluginManager().registerListener(this, this);
	}
	
	@SuppressWarnings({ "unchecked" })
	@EventHandler( priority = Byte.MAX_VALUE )
	public void onProxyLeave( PlayerDisconnectEvent e ) {
		
		UserConnection uc = ((UserConnection)e.getPlayer());
		final String name = uc.getName();
		
		uc.disconnect( "You quit the server." );
		getLogger().info("Forcing \"" + name + "\" to fuck off.");
		
		ReadWriteLock connectionLock = null;
		try {
			
			Field connectionLockField = BungeeCord.class.getDeclaredField("connectionLock");
			connectionLockField.setAccessible(true);
			connectionLock = (ReadWriteLock) connectionLockField.get(getProxy());
		} catch( Exception ex ) {
			ex.printStackTrace();
			getLogger().warning("Error on the read write lock.");
		}
			
		try {
			
			if(connectionLock != null) connectionLock.writeLock().lock();
			
			Field connectionsField = BungeeCord.class.getDeclaredField("connections");
			connectionsField.setAccessible(true);
			Map<String, UserConnection> connections = (Map<String, UserConnection>) connectionsField.get(getProxy());
			
			connections.remove( name );
			connectionsField.setAccessible(false);
			
			if(connectionLock != null) connectionLock.writeLock().unlock();
			
		} catch ( Exception ex ) {
			ex.printStackTrace();
			getLogger().warning("Error on name removal.");
		}
		
		try {
			
			if(connectionLock != null) connectionLock.writeLock().lock();
			
			Field connectionsField = BungeeCord.class.getDeclaredField("connectionsByOfflineUUID");
			connectionsField.setAccessible(true);
			Map<UUID, UserConnection> connections = (Map<UUID, UserConnection>) connectionsField.get(getProxy());
			
			connections.remove( UUID.nameUUIDFromBytes( ( "OfflinePlayer:" + name ).getBytes( Charsets.UTF_8 ) ) );
			connectionsField.setAccessible(false);
			
			if(connectionLock != null) connectionLock.writeLock().unlock();
			
		} catch ( Exception ex ) {
			ex.printStackTrace();
			getLogger().warning("Error on UUID removal.");
		}
		
	}
	
}