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.ByteToMessageDecoder; 023import net.tridentsdk.server.netty.ClientConnection; 024 025import java.util.List; 026 027/** 028 * Decrypts incoming packets and forwards the bytes to the PacketDecoder 029 * 030 * @author The TridentSDK Team 031 */ 032public class PacketDecrypter extends ByteToMessageDecoder { 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.ByteToMessageDecoder#decode(io.netty.channel.ChannelHandlerContext, 042 * io.netty.buffer.ByteBuf, java.util.List) 043 */ 044 @Override 045 protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception { 046 ByteBuf bufOut = ctx.alloc().buffer(in.readableBytes()); 047 048 if (this.connection.isEncryptionEnabled()) { 049 ByteBuf tmpBuf = ctx.alloc().buffer(in.readableBytes()); 050 051 in.readBytes(tmpBuf, in.readableBytes()); 052 bufOut.writeBytes(this.connection.decrypt(tmpBuf)); 053 tmpBuf.release(); 054 } else { 055 bufOut.writeBytes(in); 056 } 057 058 out.add(bufOut); 059 } 060}