org.virtue.network.protocol.social.SocialNetworkDecoder.java Source code

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Here is the source code for org.virtue.network.protocol.social.SocialNetworkDecoder.java

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/**
 * Copyright (c) 2014 Virtue Studios
 *
 * 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.
 */
package org.virtue.network.protocol.social;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;

import java.math.BigInteger;
import java.util.List;

import org.virtue.Constants;

/**
 * @author Im Frizzy <skype:kfriz1998>
 * @author Frosty Teh Snowman <skype:travis.mccorkle>
 * @author Arthur <skype:arthur.behesnilian>
 * @author Sundays211
 * @since Dec 22, 2014
 */
public class SocialNetworkDecoder extends ByteToMessageDecoder {

    /* (non-Javadoc)
     * @see io.netty.handler.codec.ByteToMessageDecoder#decode(io.netty.channel.ChannelHandlerContext, io.netty.buffer.ByteBuf, java.util.List)
     */
    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf buf, List<Object> out) throws Exception {
        int size = buf.readShort() & 0xFFFF;

        if (buf.readableBytes() < size)
            throw new IllegalStateException("Not enough readable bytes from buffer!");

        int version = buf.readInt();
        int subVersion = buf.readInt();

        if (version != Constants.FRAME_MAJOR && subVersion != Constants.FRAME_MINOR)
            throw new IllegalStateException("Invalid client version/sub-version!");

        //if (type.equals(LoginTypeMessage.LOGIN_WORLD))
        //buf.readByte();//TODO if its world login, client does send this byte. however social doesnt send the login type

        int secureBufferSize = buf.readShort() & 0xFFFF;
        if (buf.readableBytes() < secureBufferSize)
            throw new IllegalStateException("Not enough readable bytes from buffer.");

        byte[] secureBytes = new byte[secureBufferSize];
        buf.readBytes(secureBytes);
        ByteBuf secureBuffer = Unpooled.wrappedBuffer(new BigInteger(secureBytes)
                .modPow(Constants.getLoginKey(), Constants.getLoginModulus()).toByteArray());

        secureBuffer.readByte();
        secureBuffer.skipBytes(4);
        secureBuffer.readByte();
        secureBuffer.readByte();//int langID = 
        secureBuffer.readInt();
        int[] random = new int[5];
        for (int index = 0; index < random.length; index++) {
            random[index] = secureBuffer.readInt();
        }
        secureBuffer.readLong();
        secureBuffer.readByte();
        secureBuffer.readByte();
        ctx.channel().writeAndFlush(Unpooled.buffer().writeByte(0).writeByte(1).writeByte(2));
    }
}