MultiExploitFix

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MultiExploitFix
By CaptainShockwave

Current Features:
-Reverts over-enchanted items upon use.
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package me.captainshockwave.exploitfix;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.commons.io.FileUtils;
import org.bukkit.Bukkit;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.enchantments.Enchantment;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.EntityDamageByEntityEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;

import net.md_5.bungee.api.ChatColor;

public class Main extends JavaPlugin implements CommandExecutor, Listener {

    public void onEnable() {
        getCommand("update").setExecutor(this);
        Bukkit.getPluginManager().registerEvents(this, this);
    }

    // couldnt figure out how to get the latest version's download
    public static String getLatestVersionUrl() {
        return "spigotmc.org/plugin";
    }

    @SuppressWarnings("deprecation")
    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (label.equalsIgnoreCase("update")) {
            if (sender.isOp() || !sender.hasPermission("exploitfix.update"))
            {
                if (args.length == 0) {
                    sender.sendMessage(ChatColor.YELLOW + "Latest version: " + getLatestVersionUrl() + "\nCopy the url and use /update download <url> to download the update faster");
                } else if (args[0].equalsIgnoreCase("download")) {
                    if (args.length < 2) {
                        sender.sendMessage(ChatColor.RED + "Please paste the URL to download the update from");
                        return false;
                    }

                    Bukkit.getServer().getScheduler().scheduleAsyncDelayedTask(this , new Runnable() {
                        public void run() {
                            try {
                                sender.sendMessage(ChatColor.YELLOW + "Downloading...");
                                FileUtils.copyURLToFile(new URL(args[1]), new File("plugins/ExploitFix.jar"));
                                sender.sendMessage(ChatColor.YELLOW + "Download complete");
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    });
                }
            }
        }
        return false;
    }

    @EventHandler
    public void onEntityDamageByEntity(EntityDamageByEntityEvent event) {
        Player damager = (Player) event.getDamager();
        // prevents item from dealing damage if it was reverted
        event.setCancelled(revert(damager.getInventory().getItemInMainHand()));
    }

    // reverts the item
    public boolean revert(ItemStack itemStack) {
        boolean is32k = false;
        if (itemStack.hasItemMeta() && itemStack.getItemMeta().hasEnchants()) {
            Map<Enchantment, Integer> newEnchants = new HashMap<>();
            for (Entry<Enchantment, Integer> entry : itemStack.getEnchantments().entrySet()) {
                if (entry.getValue() > entry.getKey().getMaxLevel()) {
                    newEnchants.put(entry.getKey(), entry.getKey().getMaxLevel());
                    is32k = true;
                } else {
                    newEnchants.put(entry.getKey(), entry.getValue());
                }
                itemStack.removeEnchantment(entry.getKey());
            }
                itemStack.addEnchantments(newEnchants);
        }
        return is32k;
    }

}