FlyDetector.java

/**
 * Copyright (C) 2012 t7seven7t
 */
package net.t7seven7t.swornguard.detectors;

import net.dmulloy2.util.FormatUtil;
import net.dmulloy2.util.Util;
import net.t7seven7t.swornguard.SwornGuard;
import net.t7seven7t.swornguard.events.CheatEvent;
import net.t7seven7t.swornguard.types.CheatType;
import net.t7seven7t.swornguard.types.Permission;
import net.t7seven7t.swornguard.types.PlayerData;
import net.t7seven7t.swornguard.types.Preconditions;

import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.block.BlockFace;
import org.bukkit.entity.Player;
import org.bukkit.scheduler.BukkitRunnable;
import org.bukkit.util.Vector;

/**
 * @author t7seven7t
 */
public class FlyDetector {
	private static final BlockFace[] directions = new BlockFace[] { BlockFace.NORTH, BlockFace.EAST, BlockFace.SOUTH, BlockFace.WEST };
	private final SwornGuard plugin;
	private final Preconditions preconditions;
	private final double suspiciousVelocity;
	private final int suspiciousDistFromGround;
	private final int suspiciousMoveDist;

	public FlyDetector(final SwornGuard plugin) {
		this.plugin = plugin;
		this.preconditions = plugin.getPreconditions();
		this.suspiciousVelocity = plugin.getConfig().getDouble("flyDetectorSuspiciousVelocity");
		this.suspiciousDistFromGround = plugin.getConfig().getInt("flyDetectorSuspiciousDistFromGround");
		this.suspiciousMoveDist = plugin.getConfig().getInt("flyDetectorSuspiciousMoveDist");

		new BukkitRunnable() {

			@Override
			public void run() {
				step();
			}

		}.runTaskTimer(plugin, 20L, 5L);
	}

	private void step() {
		for (final Player player : Util.getOnlinePlayers()) {
			if (! plugin.getPermissionHandler().hasPermission(player, Permission.ALLOW_FLY)) {
				if (! player.getAllowFlight() && (player.getVelocity().getY() < suspiciousVelocity || (! isInWater(player) && getDistanceToGround(player) >= suspiciousDistFromGround))) {
					if (! preconditions.isPlayerFallingIntoVoid(player) && ! preconditions.isPlayerInsideCar(player) && ! player.isInsideVehicle() && ! preconditions.isNewPlayerJoin(player) && ! preconditions.hasRecentlyTeleported(player)) {
						final PlayerData data = plugin.getPlayerDataCache().getData(player);
						final Vector previousLocation = player.getLocation().toVector();
						if (! data.isJailed() && System.currentTimeMillis() - data.getLastFlyWarn() > 45000L) {
							data.setLastFlyWarn(System.currentTimeMillis());

							new BukkitRunnable() {

								@Override
								public void run() {
									checkPlayer(player, previousLocation);
								}

							}.runTaskLater(plugin, 5L);
						}
					}
				}
			}
		}
	}

	private void checkPlayer(Player player, Vector previousLocation) {
		PlayerData data = plugin.getPlayerDataCache().getData(player);

		if (player.getLocation().getY() - previousLocation.getY() > 3 ||
				(player.getLocation().getY() >= previousLocation.getY() &&
					(Math.abs(player.getLocation().getX() - previousLocation.getX()) > suspiciousMoveDist ||
					Math.abs(player.getLocation().getZ() - previousLocation.getZ()) > suspiciousMoveDist))) {
			data.setConsecutivePings(data.getConsecutivePings() + 1);
			if (data.getConsecutivePings() >= 2) {
				CheatEvent event = new CheatEvent(player, CheatType.FLYING,
						FormatUtil.format(plugin.getMessage("cheat_message"), player.getName(), "flying!"));
				plugin.getCheatHandler().announceCheat(event);

				data.setConsecutivePings(0);
			}

			data.setLastFlyWarn(System.currentTimeMillis());
		} else {
			data.setLastFlyWarn(0);
		}
	}

	private boolean isInWater(Player player) {
		Block block = player.getWorld().getBlockAt(player.getLocation());

		if (isBlockWaterOrClimbable(block))
			return true;

		for (BlockFace face : directions) {
			if (isBlockWaterOrClimbable(block.getRelative(face)))
				return true;
		}

		return false;
	}

	public boolean isBlockWaterOrClimbable(Block block) {
		return block != null && (block.isLiquid() || block.getType().equals(Material.LADDER) || block.getType().equals(Material.VINE));
	}

	private int getDistanceToGround(Player player) {
		Location loc = player.getLocation();
		int count = 1;
		while (loc.subtract(0, 1, 0).getY() > 1 && count < suspiciousDistFromGround &&
				player.getWorld().getBlockAt(loc).getType().equals(Material.AIR) ||
				player.getWorld().getBlockAt(loc).getType().equals(Material.WATER) ||
				player.getWorld().getBlockAt(loc).getType().equals(Material.LAVA)) {
			count++;
		}

		return count;
	}

}