DenizenNetworkManager_v1_8_R3.java

package net.aufdemrand.denizen.nms.impl.packets.handlers;

import io.netty.channel.ChannelHandlerContext;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;
import net.aufdemrand.denizen.nms.NMSHandler;
import net.aufdemrand.denizen.nms.impl.entities.EntityFakePlayer_v1_8_R3;
import net.aufdemrand.denizen.nms.impl.packets.PacketOutChat_v1_8_R3;
import net.aufdemrand.denizen.nms.impl.packets.PacketOutEntityMetadata_v1_8_R3;
import net.aufdemrand.denizen.nms.impl.packets.PacketOutSpawnEntity_v1_8_R3;
import net.aufdemrand.denizen.nms.interfaces.packets.PacketHandler;
import net.aufdemrand.denizen.nms.interfaces.packets.PacketOutSpawnEntity;
import net.minecraft.server.v1_8_R3.*;
import net.minecraft.server.v1_8_R3.PacketPlayOutPlayerInfo.EnumPlayerInfoAction;
import org.bukkit.Bukkit;
import org.bukkit.craftbukkit.v1_8_R3.entity.CraftPlayer;
import org.bukkit.entity.Player;

import javax.crypto.SecretKey;
import java.lang.reflect.Field;
import java.net.SocketAddress;
import java.util.UUID;

public class DenizenNetworkManager_v1_8_R3 extends NetworkManager {

    private final NetworkManager oldManager;
    private final DenizenPacketListener_v1_8_R3 packetListener;
    private final EntityPlayer player;
    private final PacketHandler packetHandler;

    public DenizenNetworkManager_v1_8_R3(EntityPlayer entityPlayer, NetworkManager oldManager, PacketHandler packetHandler) {
        super(getProtocolDirection(oldManager));
        this.oldManager = oldManager;
        this.channel = oldManager.channel;
        this.packetListener = new DenizenPacketListener_v1_8_R3(this, entityPlayer);
        oldManager.a(packetListener);
        this.player = this.packetListener.player;
        this.packetHandler = packetHandler;
    }

    public static void setNetworkManager(Player player, PacketHandler packetHandler) {
        EntityPlayer entityPlayer = ((CraftPlayer) player).getHandle();
        PlayerConnection playerConnection = entityPlayer.playerConnection;
        setNetworkManager(playerConnection, new DenizenNetworkManager_v1_8_R3(entityPlayer, playerConnection.networkManager, packetHandler));
    }

    public void channelActive(ChannelHandlerContext channelhandlercontext) throws Exception {
        oldManager.channelActive(channelhandlercontext);
    }

    public void a(EnumProtocol enumprotocol) {
        oldManager.a(enumprotocol);
    }

    public void channelInactive(ChannelHandlerContext channelhandlercontext) throws Exception {
        oldManager.channelInactive(channelhandlercontext);
    }

    public void exceptionCaught(ChannelHandlerContext channelhandlercontext, Throwable throwable) throws Exception {
        oldManager.exceptionCaught(channelhandlercontext, throwable);
    }

    protected void a(ChannelHandlerContext channelhandlercontext, Packet packet) throws Exception {
        if (oldManager.channel.isOpen()) {
            try {
                packet.a(this.packetListener);
            }
            catch (Exception e) {
                // Do nothing
                //dB.echoError(e);
            }
        }
    }

    public void a(PacketListener packetlistener) {
        oldManager.a(packetlistener);
    }

    public void handle(Packet packet) {
        // If the packet sending isn't cancelled, allow normal sending
        if (packet instanceof PacketPlayOutChat) {
            if (!packetHandler.sendPacket(player.getBukkitEntity(), new PacketOutChat_v1_8_R3((PacketPlayOutChat) packet))) {
                oldManager.handle(packet);
            }
        }
        else if (packet instanceof PacketPlayOutNamedEntitySpawn
                || packet instanceof PacketPlayOutSpawnEntity
                || packet instanceof PacketPlayOutSpawnEntityLiving
                || packet instanceof PacketPlayOutSpawnEntityPainting
                || packet instanceof PacketPlayOutSpawnEntityExperienceOrb) {
            PacketOutSpawnEntity spawnEntity = new PacketOutSpawnEntity_v1_8_R3(player, packet);
            UUID uuid = spawnEntity.getEntityUuid();
            if (!NMSHandler.getInstance().getEntityHelper().isHidden(player.getBukkitEntity(), uuid)) {
                Entity entity = ((WorldServer) player.getWorld()).getEntity(uuid);
                if (entity != null) {
                    if (entity instanceof EntityFakePlayer_v1_8_R3) {
                        final EntityFakePlayer_v1_8_R3 fakePlayer = (EntityFakePlayer_v1_8_R3) entity;
                        handle(new PacketPlayOutPlayerInfo(EnumPlayerInfoAction.ADD_PLAYER, fakePlayer));
                        Bukkit.getScheduler().runTaskLater(NMSHandler.getJavaPlugin(), new Runnable() {
                            @Override
                            public void run() {
                                handle(new PacketPlayOutPlayerInfo(EnumPlayerInfoAction.REMOVE_PLAYER, fakePlayer));
                            }
                        }, 5);
                    }
                }
                oldManager.handle(packet);
            }
        }
        else if (packet instanceof PacketPlayOutEntityMetadata) {
            if (!packetHandler.sendPacket(player.getBukkitEntity(), new PacketOutEntityMetadata_v1_8_R3((PacketPlayOutEntityMetadata) packet))) {
                oldManager.handle(packet);
            }
        }
        else {
            oldManager.handle(packet);
        }
    }

    public void a(Packet packet, GenericFutureListener<? extends Future<? super Void>> genericfuturelistener, GenericFutureListener<? extends Future<? super Void>>... agenericfuturelistener) {
        oldManager.a(packet, genericfuturelistener, agenericfuturelistener);
    }

    public void a() {
        oldManager.a();
    }

    public SocketAddress getSocketAddress() {
        return oldManager.getSocketAddress();
    }

    public void close(IChatBaseComponent ichatbasecomponent) {
        oldManager.close(ichatbasecomponent);
    }

    public boolean c() {
        return oldManager.c();
    }

    public void a(SecretKey secretkey) {
        oldManager.a(secretkey);
    }

    public boolean g() {
        return oldManager.g();
    }

    public boolean h() {
        return oldManager.h();
    }

    public PacketListener getPacketListener() {
        return oldManager.getPacketListener();
    }

    public IChatBaseComponent j() {
        return oldManager.j();
    }

    public void k() {
        oldManager.k();
    }

    public void a(int i) {
        oldManager.a(i);
    }

    public void l() {
        oldManager.l();
    }

    protected void channelRead0(ChannelHandlerContext channelhandlercontext, Packet object) throws Exception {
        this.a(channelhandlercontext, object);
    }

    public SocketAddress getRawAddress() {
        return oldManager.getRawAddress();
    }

    //////////////////////////////////
    //// Reflection Methods/Fields
    ///////////

    private static final Field protocolDirectionField;
    private static final Field networkManagerField;

    static {
        Field directionField = null;
        Field managerField = null;
        try {
            directionField = NetworkManager.class.getDeclaredField("h");
            directionField.setAccessible(true);
            managerField = PlayerConnection.class.getDeclaredField("networkManager");
            managerField.setAccessible(true);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        protocolDirectionField = directionField;
        networkManagerField = managerField;
    }

    private static EnumProtocolDirection getProtocolDirection(NetworkManager networkManager) {
        EnumProtocolDirection direction = null;
        try {
            direction = (EnumProtocolDirection) protocolDirectionField.get(networkManager);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        return direction;
    }

    private static void setNetworkManager(PlayerConnection playerConnection, NetworkManager networkManager) {
        try {
            networkManagerField.set(playerConnection, networkManager);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
}