001/*
002 * Trident - A Multithreaded Server Alternative
003 * Copyright 2014 The TridentSDK Team
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *    http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package net.tridentsdk.server.packets.handshake;
019
020import io.netty.buffer.ByteBuf;
021import net.tridentsdk.server.netty.ClientConnection;
022import net.tridentsdk.server.netty.Codec;
023import net.tridentsdk.server.netty.packet.InPacket;
024import net.tridentsdk.server.netty.packet.Packet;
025import net.tridentsdk.server.netty.packet.PacketDirection;
026import net.tridentsdk.server.netty.protocol.Protocol;
027
028/**
029 * The handshake packet from the client defining information about said client
030 *
031 * @author The TridentSDK Team
032 */
033public class PacketHandshakeIn extends InPacket {
034    /**
035     * Protocol version the client is running on
036     */
037    protected int protocolVersion;
038
039    /**
040     * Believed to stay as "localhost", more documentation required
041     */
042    protected String address;
043
044    /**
045     * Believed to be always "25565", more documentation required
046     */
047    protected short port;
048
049    /**
050     * The next stage the client will be going into  1 for STATUS 2 for LOGIN
051     */
052    protected int nextState;
053
054    @Override
055    public Packet decode(ByteBuf buf) {
056        this.protocolVersion = Codec.readVarInt32(buf);
057        this.address = Codec.readString(buf);
058        this.port = buf.readShort();
059        this.nextState = Codec.readVarInt32(buf);
060        return this;
061    }
062
063    @Override
064    public int id() {
065        return 0x00;
066    }
067
068    @Override
069    public PacketDirection direction() {
070        return PacketDirection.OUT;
071    }
072
073    /**
074     * {@inheritDoc}
075     *
076     * <p>Nothing is done here</p>
077     */
078    @Override
079    public void handleReceived(ClientConnection connection) {
080        switch (this.nextState) {
081            case 1:
082                connection.setStage(Protocol.ClientStage.STATUS);
083                break;
084
085            case 2:
086                connection.setStage(Protocol.ClientStage.LOGIN);
087                break;
088        }
089    }
090}