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.netty.packet;
019
020import io.netty.buffer.ByteBuf;
021import io.netty.channel.ChannelHandlerContext;
022import io.netty.handler.codec.MessageToByteEncoder;
023import net.tridentsdk.server.netty.ClientConnection;
024
025/**
026 * An encoder that encrypts the information contained in the raw packet
027 *
028 * <p>This is first stage in the outbound packet pipeline</p>
029 *
030 * @author The TridentSDK Team
031 */
032public class PacketEncrypter extends MessageToByteEncoder<ByteBuf> {
033    private ClientConnection connection;
034
035    @Override
036    public void handlerAdded(ChannelHandlerContext context) {
037        this.connection = ClientConnection.connection(context);
038    }
039
040    /* (non-Javadoc)
041     * @see io.netty.handler.codec.MessageToByteEncoder#encode(io.netty.channel.ChannelHandlerContext,
042     * java.lang.Object, io.netty.buffer.ByteBuf)
043     */
044    @Override
045    protected void encode(ChannelHandlerContext ctx, ByteBuf msg, ByteBuf out) throws Exception {
046        if (this.connection.isEncryptionEnabled()) {
047            out.writeBytes(this.connection.encrypt(msg));
048        } else {
049            out.writeBytes(msg);
050        }
051    }
052}