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    • dorkbox.network.pipeline.udp.KryoDecoderUdp Maven / Gradle / Ivy

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    Encrypted, high-performance, and event-driven/reactive network stack for Java 11+

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    /*
 * Copyright 2010 dorkbox, llc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package dorkbox.network.pipeline.udp;

import dorkbox.network.connection.KryoCryptoSerializationManager;
import dorkbox.network.util.CryptoSerializationManager;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.socket.DatagramPacket;
import io.netty.handler.codec.MessageToMessageDecoder;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.List;

@Sharable
public
class KryoDecoderUdp extends MessageToMessageDecoder {

    private final CryptoSerializationManager serializationManager;

    public
    KryoDecoderUdp(CryptoSerializationManager serializationManager) {
        this.serializationManager = serializationManager;
    }

    @Override
    protected
    void decode(ChannelHandlerContext ctx, DatagramPacket msg, List out) throws Exception {
        if (msg != null) {
            ByteBuf data = msg.content();

            if (data != null) {
                // there is a REMOTE possibility that UDP traffic BEAT the TCP registration traffic, which means that THIS packet
                // COULD be encrypted!

                if (KryoCryptoSerializationManager.isEncrypted(data)) {
                    String message = "Encrypted UDP packet received before registration complete.";
                    LoggerFactory.getLogger(this.getClass()).error(message);
                    throw new IOException(message);
                } else {
                    try {
                        // no connection here because we haven't created one yet. When we do, we replace this handler with a new one.
                        Object read = serializationManager.read(data, data.writerIndex());
                        out.add(read);
                    } catch (IOException e) {
                        String message = "Unable to deserialize object";
                        LoggerFactory.getLogger(this.getClass()).error(message, e);
                        throw new IOException(message, e);
                    }
                }
            }
        }
    }
}
    
    
    
    

    




    
    
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