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//
// ========================================================================
// Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.rhttp.gateway;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.client.Address;
import org.eclipse.jetty.client.ContentExchange;
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.HttpExchange;
import org.eclipse.jetty.io.Buffer;
import org.eclipse.jetty.io.ByteArrayBuffer;
import org.eclipse.jetty.rhttp.client.JettyClient;
import org.eclipse.jetty.rhttp.client.RHTTPClient;
import org.eclipse.jetty.rhttp.client.RHTTPListener;
import org.eclipse.jetty.rhttp.client.RHTTPRequest;
import org.eclipse.jetty.rhttp.client.RHTTPResponse;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.nio.SelectChannelConnector;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/**
* <p>This class combines a gateway server and a gateway client to obtain the functionality of a simple proxy server.</p>
* <p>This gateway proxy server starts on port 8080 and can be set as http proxy in browsers such as Firefox, and used
* to browse the internet.</p>
* <p>Its functionality is limited (for example, it only supports http, and not https).</p>
* @version $Revision$ $Date$
*/
public class GatewayProxyServer
{
private static final Logger logger = Log.getLogger(GatewayProxyServer.class.toString());
public static void main(String[] args) throws Exception
{
GatewayServer server = new GatewayServer();
Connector plainConnector = new SelectChannelConnector();
plainConnector.setPort(8080);
server.addConnector(plainConnector);
((StandardGateway)server.getGateway()).setExternalTimeout(180000);
((StandardGateway)server.getGateway()).setGatewayTimeout(20000);
server.setTargetIdRetriever(new ProxyTargetIdRetriever());
server.start();
HttpClient httpClient = new HttpClient();
httpClient.setConnectorType(HttpClient.CONNECTOR_SOCKET);
httpClient.start();
RHTTPClient client = new JettyClient(httpClient, new Address("localhost", plainConnector.getPort()), server.getContext().getContextPath() + "/gw", "proxy");
client.addListener(new ProxyListener(httpClient, client));
client.connect();
Runtime.getRuntime().addShutdownHook(new Shutdown(server, httpClient, client));
logger.info("{} started", GatewayProxyServer.class.getSimpleName());
}
private static class Shutdown extends Thread
{
private final GatewayServer server;
private final HttpClient httpClient;
private final RHTTPClient client;
public Shutdown(GatewayServer server, HttpClient httpClient, RHTTPClient client)
{
this.server = server;
this.httpClient = httpClient;
this.client = client;
}
@Override
public void run()
{
try
{
client.disconnect();
httpClient.stop();
server.stop();
logger.info("{} stopped", GatewayProxyServer.class.getSimpleName());
}
catch (Exception x)
{
logger.debug("Exception while stopping " + GatewayProxyServer.class.getSimpleName(), x);
}
}
}
private static class ProxyListener implements RHTTPListener
{
private final HttpClient httpClient;
private final RHTTPClient client;
private ProxyListener(HttpClient httpClient, RHTTPClient client)
{
this.httpClient = httpClient;
this.client = client;
}
public void onRequest(RHTTPRequest request) throws Exception
{
ProxyExchange exchange = new ProxyExchange();
Address address = Address.from(request.getHeaders().get("Host"));
if (address.getPort() == 0) address = new Address(address.getHost(), 80);
exchange.setAddress(address);
exchange.setMethod(request.getMethod());
exchange.setURI(request.getURI());
for (Map.Entry<String, String> header : request.getHeaders().entrySet())
exchange.setRequestHeader(header.getKey(), header.getValue());
exchange.setRequestContent(new ByteArrayBuffer(request.getBody()));
int status = syncSend(exchange);
if (status == HttpExchange.STATUS_COMPLETED)
{
int statusCode = exchange.getResponseStatus();
String statusMessage = exchange.getResponseMessage();
Map<String, String> responseHeaders = exchange.getResponseHeaders();
byte[] responseBody = exchange.getResponseBody();
RHTTPResponse response = new RHTTPResponse(request.getId(), statusCode, statusMessage, responseHeaders, responseBody);
client.deliver(response);
}
else
{
int statusCode = HttpServletResponse.SC_SERVICE_UNAVAILABLE;
String statusMessage = "Gateway error";
HashMap<String, String> responseHeaders = new HashMap<String, String>();
responseHeaders.put("Connection", "close");
byte[] responseBody = new byte[0];
RHTTPResponse response = new RHTTPResponse(request.getId(), statusCode, statusMessage, responseHeaders, responseBody);
client.deliver(response);
}
}
private int syncSend(ProxyExchange exchange) throws Exception
{
long start = System.nanoTime();
httpClient.send(exchange);
int status = exchange.waitForDone();
long end = System.nanoTime();
long millis = TimeUnit.NANOSECONDS.toMillis(end - start);
long micros = TimeUnit.NANOSECONDS.toMicros(end - start - TimeUnit.MILLISECONDS.toNanos(millis));
logger.debug("Proxied request took {}.{} ms", millis, micros);
return status;
}
}
private static class ProxyExchange extends ContentExchange
{
private String responseMessage;
private Map<String, String> responseHeaders = new HashMap<String, String>();
private ByteArrayOutputStream responseBody = new ByteArrayOutputStream();
private ProxyExchange()
{
super(true);
}
public String getResponseMessage()
{
return responseMessage;
}
public Map<String, String> getResponseHeaders()
{
return responseHeaders;
}
public byte[] getResponseBody()
{
return responseBody.toByteArray();
}
@Override
protected void onResponseStatus(Buffer version, int code, Buffer message) throws IOException
{
super.onResponseStatus(version, code, message);
this.responseMessage = message.toString("UTF-8");
}
@Override
protected void onResponseHeader(Buffer nameBuffer, Buffer valueBuffer) throws IOException
{
super.onResponseHeader(nameBuffer, valueBuffer);
String name = nameBuffer.toString("UTF-8");
String value = valueBuffer.toString("UTF-8");
// Skip chunked header, since we read the whole body and will not re-chunk it
if (!name.equalsIgnoreCase("Transfer-Encoding") || !value.equalsIgnoreCase("chunked"))
responseHeaders.put(name, value);
}
@Override
protected void onResponseContent(Buffer buffer) throws IOException
{
responseBody.write(buffer.asArray());
super.onResponseContent(buffer);
}
}
public static class ProxyTargetIdRetriever implements TargetIdRetriever
{
public String retrieveTargetId(HttpServletRequest httpRequest)
{
return "proxy";
}
}
}
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