Code to remove enchantments sent to other clients

EnchantHider.java

/**
 * (c) 2015 dmulloy2
 */
package net.dmulloy2.enchanthider;

import java.util.Collections;
import java.util.Set;

import net.dmulloy2.enchanthider.packets.WrapperPlayServerEntityEquipment;

import org.bukkit.Material;
import org.bukkit.enchantments.Enchantment;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.BookMeta;
import org.bukkit.inventory.meta.FireworkEffectMeta;
import org.bukkit.inventory.meta.FireworkMeta;
import org.bukkit.inventory.meta.ItemMeta;

import com.comphenix.protocol.PacketType;
import com.comphenix.protocol.ProtocolLibrary;
import com.comphenix.protocol.ProtocolManager;
import com.comphenix.protocol.events.ListenerPriority;
import com.comphenix.protocol.events.PacketAdapter;
import com.comphenix.protocol.events.PacketEvent;

/**
 * @author dmulloy2
 */

public class Protocol extends JavaPlugin {
	private ProtocolManager manager;

	@Override
	public void onEnable() {
		manager = ProtocolLibrary.getProtocolManager();

		manager.addPacketListener(new PacketAdapter(PacketAdapter.params()
				.plugin(this).types(PacketType.Play.Server.ENTITY_EQUIPMENT)
				.listenerPriority(ListenerPriority.NORMAL)) {
			@Override
			public void onPacketSending(PacketEvent event) {
				try {
					WrapperPlayServerEntityEquipment packet = new WrapperPlayServerEntityEquipment(event.getPacket());
					if (packet.getItem() != null && ! event.getPlayer().equals(packet.getEntity(event))) { // Make sure it's not the player
						ItemStack item = packet.getItem();

						// Reset potion type
						if (item.getType() == Material.POTION) {
							item.setDurability((short) 0);
						}

						// Remove the enchantments
						Set<Enchantment> enchants = item.getEnchantments().keySet();
						for (Enchantment ench : enchants.toArray(new Enchantment[enchants.size()])) { // Avoid CME's
							item.removeEnchantment(ench);
						}

						// Remove meta
						if (item.hasItemMeta()) {
							ItemMeta meta = item.getItemMeta();

							meta.setLore(null);
							meta.setDisplayName(null);

							if (meta instanceof BookMeta) {
								BookMeta bookMeta = (BookMeta) meta;

								bookMeta.setTitle(null);
								bookMeta.setPages(Collections.emptyList());
								bookMeta.setAuthor(null);
							} else if (meta instanceof FireworkEffectMeta) {
								((FireworkEffectMeta) meta).setEffect(null);
							} else if (meta instanceof FireworkMeta) {
								FireworkMeta fireworkMeta = (FireworkMeta) meta;

								fireworkMeta.clearEffects();
								fireworkMeta.setPower(0);
							}

							item.setItemMeta(meta);
						}

						item.setAmount(1);
						packet.setItem(item);
					}
				} catch (Throwable ex) { // Should catch any CME's
					System.err.println("Encountered an exception onPacketSending for ENTITY_EQUIPMENT:");
					ex.printStackTrace();
				}
			}
		});
	}

	@Override
	public void onDisable() {
		manager.removePacketListeners(this);
	}
}