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/*
 * Copyright 2015 The Netty Project
 *
 * The Netty Project licenses this file to you 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:
 *
 *   https://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 io.netty.handler.codec.socksx;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.ByteToMessageDecoder;
import io.netty.handler.codec.socksx.v4.Socks4ServerDecoder;
import io.netty.handler.codec.socksx.v4.Socks4ServerEncoder;
import io.netty.handler.codec.socksx.v5.Socks5AddressEncoder;
import io.netty.handler.codec.socksx.v5.Socks5InitialRequestDecoder;
import io.netty.handler.codec.socksx.v5.Socks5ServerEncoder;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import java.util.List;

/**
 * Detects the version of the current SOCKS connection and initializes the pipeline with
 * {@link Socks4ServerDecoder} or {@link Socks5InitialRequestDecoder}.
 */
public class SocksPortUnificationServerHandler extends ByteToMessageDecoder {

    private static final InternalLogger logger =
            InternalLoggerFactory.getInstance(SocksPortUnificationServerHandler.class);

    private final Socks5ServerEncoder socks5encoder;

    /**
     * Creates a new instance with the default configuration.
     */
    public SocksPortUnificationServerHandler() {
        this(Socks5ServerEncoder.DEFAULT);
    }

    /**
     * Creates a new instance with the specified {@link Socks5ServerEncoder}.
     * This constructor is useful when a user wants to use an alternative {@link Socks5AddressEncoder}.
     */
    public SocksPortUnificationServerHandler(Socks5ServerEncoder socks5encoder) {
        this.socks5encoder = ObjectUtil.checkNotNull(socks5encoder, "socks5encoder");
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List