content: /*
   * Copyright (c) 2019 abc123lzf <abc123lzf@126.com>
   *
   * 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 com.lzf.flyingsocks.client.proxy.socks;
  
  import com.lzf.flyingsocks.client.proxy.ProxyRequest;
  import com.lzf.flyingsocks.client.proxy.ProxyRequestManager;
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.ChannelInboundHandlerAdapter;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.util.Objects;
  
  /**
   * @author lzf abc123lzf@126.com
   * @since 2021/1/12 5:58
   */
  public class TcpProxyMessageHandler extends ChannelInboundHandlerAdapter {
  
      private static final Logger log = LoggerFactory.getLogger(TcpProxyMessageHandler.class);
  
      private final ProxyRequest proxyRequest;
  
      public TcpProxyMessageHandler(ProxyRequest proxyRequest, ProxyRequestManager manager) {
          this.proxyRequest = Objects.requireNonNull(proxyRequest);
          manager.publish(proxyRequest);
      }
  
      @Override
      public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
          if (msg instanceof ByteBuf) {
              ByteBuf buf = (ByteBuf) msg;
              try {
                  proxyRequest.transferClientMessage(buf);
              } finally {
                  buf.release();
              }
          } else {
              ctx.fireChannelRead(msg);
          }
      }
  
      @Override
      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
          if (cause instanceof IOException) {
              log.info("Local client close connection, from {}", ctx.channel().remoteAddress());
              ctx.close();
          } else if (log.isWarnEnabled()) {
              log.warn("Exception caught in TCPProxyMessageHandler", cause);
          }
      }
  
      @Override
      public void channelInactive(ChannelHandlerContext ctx) {
          proxyRequest.close();
          ctx.pipeline().remove(this);
          ctx.fireChannelInactive();
      }
  }
  