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MockServer NeoLight Netty Server
There is a newer version: 1.0.8
/*
 * Copyright © 2024 XDEV Software (https://xdev.software)
 *
 * 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 software.xdev.mockserver.netty.proxy.relay;

import static software.xdev.mockserver.exception.ExceptionHandling.connectionClosedException;
import static software.xdev.mockserver.mock.action.http.HttpActionHandler.getRemoteAddress;
import static software.xdev.mockserver.netty.unification.PortUnificationHandler.isSslEnabledUpstream;

import java.net.InetSocketAddress;
import java.nio.charset.StandardCharsets;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.http.HttpClientCodec;
import io.netty.handler.codec.http.HttpContentDecompressor;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import software.xdev.mockserver.configuration.ServerConfiguration;
import software.xdev.mockserver.lifecycle.LifeCycle;
import software.xdev.mockserver.logging.LoggingHandler;


@ChannelHandler.Sharable
public abstract class RelayConnectHandler extends SimpleChannelInboundHandler
{
	private static final Logger LOG = LoggerFactory.getLogger(RelayConnectHandler.class);
	public static final String PROXIED = "PROXIED_";
	public static final String PROXIED_SECURE = PROXIED + "SECURE_";
	public static final String PROXIED_RESPONSE = "PROXIED_RESPONSE_";
	private final ServerConfiguration configuration;
	private final LifeCycle server;
	protected final String host;
	protected final int port;
	
	protected RelayConnectHandler(
		final ServerConfiguration configuration,
		final LifeCycle server,
		final String host,
		final int port)
	{
		this.configuration = configuration;
		this.server = server;
		this.host = host;
		this.port = port;
	}
	
	@Override
	public void channelRead0(final ChannelHandlerContext proxyClientCtx, final T request)
	{
		final Bootstrap bootstrap = new Bootstrap()
			.group(proxyClientCtx.channel().eventLoop())
			.channel(NioSocketChannel.class)
			.handler(new ChannelInboundHandlerAdapter()
			{
				@Override
				public void channelActive(final ChannelHandlerContext mockServerCtx)
				{
					if(isSslEnabledUpstream(proxyClientCtx.channel()))
					{
						mockServerCtx.writeAndFlush(Unpooled.copiedBuffer((PROXIED_SECURE
							+ RelayConnectHandler.this.host
							+ ":" + RelayConnectHandler.this.port).getBytes(
							StandardCharsets.UTF_8))).awaitUninterruptibly();
					}
					else
					{
						mockServerCtx.writeAndFlush(Unpooled.copiedBuffer((PROXIED + RelayConnectHandler.this.host + ":"
							+ RelayConnectHandler.this.port).getBytes(
							StandardCharsets.UTF_8))).awaitUninterruptibly();
					}
				}
				
				@Override
				public void channelRead(final ChannelHandlerContext mockServerCtx, final Object msg)
				{
					if(msg instanceof final ByteBuf byteBuf)
					{
						final byte[] bytes = ByteBufUtil.getBytes(byteBuf);
						if(new String(bytes, StandardCharsets.UTF_8).startsWith(PROXIED_RESPONSE))
						{
							proxyClientCtx
								.writeAndFlush(RelayConnectHandler.this.successResponse(request))
								.addListener((ChannelFutureListener)channelFuture -> {
									RelayConnectHandler.this.removeCodecSupport(proxyClientCtx);
									
									// upstream (to MockServer)
									final ChannelPipeline pipelineToMockServer = mockServerCtx.channel().pipeline();
									
									if(LOG.isTraceEnabled())
									{
										pipelineToMockServer.addLast(new LoggingHandler(
											RelayConnectHandler.class.getName() + "-downstream -->"));
									}
									
									pipelineToMockServer.addLast(new HttpClientCodec(
										RelayConnectHandler.this.configuration.maxInitialLineLength(),
										RelayConnectHandler.this.configuration.maxHeaderSize(),
										RelayConnectHandler.this.configuration.maxChunkSize()));
									pipelineToMockServer.addLast(new HttpContentDecompressor());
									pipelineToMockServer.addLast(new HttpObjectAggregator(Integer.MAX_VALUE));
									
									pipelineToMockServer.addLast(
										new DownstreamProxyRelayHandler(proxyClientCtx.channel()));
									
									// downstream (to proxy client)
									final ChannelPipeline pipelineToProxyClient = proxyClientCtx.channel().pipeline();
									
									if(LOG.isTraceEnabled())
									{
										pipelineToProxyClient.addLast(new LoggingHandler(
											RelayConnectHandler.class.getName() + "-upstream <-- "));
									}
									
									pipelineToProxyClient.addLast(new HttpServerCodec(
										RelayConnectHandler.this.configuration.maxInitialLineLength(),
										RelayConnectHandler.this.configuration.maxHeaderSize(),
										RelayConnectHandler.this.configuration.maxChunkSize()));
									pipelineToProxyClient.addLast(new HttpContentDecompressor());
									pipelineToProxyClient.addLast(new HttpObjectAggregator(Integer.MAX_VALUE));
									
									pipelineToProxyClient.addLast(
										new UpstreamProxyRelayHandler(mockServerCtx.channel()));
								});
						}
						else
						{
							mockServerCtx.fireChannelRead(msg);
						}
					}
				}
			});
		
		final InetSocketAddress remoteSocket = this.getDownstreamSocket(proxyClientCtx);
		bootstrap.connect(remoteSocket).addListener((ChannelFutureListener)future -> {
			if(!future.isSuccess())
			{
				this.failure(
					"Connection failed to " + remoteSocket,
					future.cause(),
					proxyClientCtx,
					this.failureResponse(request));
			}
		});
	}
	
	private InetSocketAddress getDownstreamSocket(final ChannelHandlerContext ctx)
	{
		final InetSocketAddress remoteAddress = getRemoteAddress(ctx);
		if(remoteAddress != null)
		{
			return remoteAddress;
		}
		return new InetSocketAddress(this.server.getLocalPort());
	}
	
	@Override
	public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause)
	{
		this.failure(
			"Exception caught by CONNECT proxy handler -> closing pipeline ",
			cause,
			ctx,
			this.failureResponse(null));
	}
	
	private void failure(
		final String message,
		final Throwable cause,
		final ChannelHandlerContext ctx,
		final Object response)
	{
		if(connectionClosedException(cause))
		{
			LOG.error(message, cause);
		}
		final Channel channel = ctx.channel();
		channel.writeAndFlush(response);
		if(channel.isActive())
		{
			channel.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
		}
	}
	
	protected abstract void removeCodecSupport(ChannelHandlerContext ctx);
	
	protected abstract Object successResponse(Object request);
	
	protected abstract Object failureResponse(Object request);
	
	protected void removeHandler(final ChannelPipeline pipeline, final Class handlerType)
	{
		if(pipeline.get(handlerType) != null)
		{
			pipeline.remove(handlerType);
		}
	}
	
	protected void removeHandler(final ChannelPipeline pipeline, final ChannelHandler channelHandler)
	{
		if(pipeline.toMap().containsValue(channelHandler))
		{
			pipeline.remove(channelHandler);
		}
	}
}