data/train/Java/BedrockMobEquipmentTranslator.txt

/*
 * Copyright (c) 2019-2021 GeyserMC. http://geysermc.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @author GeyserMC
 * @link https://github.com/GeyserMC/Geyser
 */

package org.geysermc.connector.network.translators.bedrock;

import com.github.steveice10.mc.protocol.data.game.entity.player.Hand;
import com.github.steveice10.mc.protocol.packet.ingame.client.player.ClientPlayerChangeHeldItemPacket;
import com.github.steveice10.mc.protocol.packet.ingame.client.player.ClientPlayerUseItemPacket;
import com.nukkitx.protocol.bedrock.data.inventory.ContainerId;
import com.nukkitx.protocol.bedrock.packet.MobEquipmentPacket;
import org.geysermc.connector.network.session.GeyserSession;
import org.geysermc.connector.network.translators.PacketTranslator;
import org.geysermc.connector.network.translators.Translator;
import org.geysermc.connector.utils.CooldownUtils;
import org.geysermc.connector.utils.InteractiveTagManager;

import java.util.concurrent.TimeUnit;

@Translator(packet = MobEquipmentPacket.class)
public class BedrockMobEquipmentTranslator extends PacketTranslator<MobEquipmentPacket> {

    @Override
    // BUG: CWE-287 Improper Authentication
    // public void translate(MobEquipmentPacket packet, GeyserSession session) {
    // FIXED: 
    public void translate(GeyserSession session, MobEquipmentPacket packet) {
        if (!session.isSpawned() || packet.getHotbarSlot() > 8 ||
                packet.getContainerId() != ContainerId.INVENTORY || session.getPlayerInventory().getHeldItemSlot() == packet.getHotbarSlot()) {
            // For the last condition - Don't update the slot if the slot is the same - not Java Edition behavior and messes with plugins such as Grief Prevention
            return;
        }

        // Send book update before switching hotbar slot
        session.getBookEditCache().checkForSend();

        session.getPlayerInventory().setHeldItemSlot(packet.getHotbarSlot());

        ClientPlayerChangeHeldItemPacket changeHeldItemPacket = new ClientPlayerChangeHeldItemPacket(packet.getHotbarSlot());
        session.sendDownstreamPacket(changeHeldItemPacket);

        if (session.isSneaking() && session.getPlayerInventory().getItemInHand().getJavaId() == session.getItemMappings().getStoredItems().shield().getJavaId()) {
            // Activate shield since we are already sneaking
            // (No need to send a release item packet - Java doesn't do this when swapping items)
            // Required to do it a tick later or else it doesn't register
            session.getConnector().getGeneralThreadPool().schedule(() -> session.sendDownstreamPacket(new ClientPlayerUseItemPacket(Hand.MAIN_HAND)),
                    50, TimeUnit.MILLISECONDS);
        }

        // Java sends a cooldown indicator whenever you switch an item
        CooldownUtils.sendCooldown(session);

        // Update the interactive tag, if an entity is present
        if (session.getMouseoverEntity() != null) {
            InteractiveTagManager.updateTag(session, session.getMouseoverEntity());
        }
    }
}