org.mortbay.proxy.AsyncProxyServlet Maven / Gradle / Ivy
// ========================================================================
// Copyright 2006-2007 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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 org.mortbay.proxy;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.MalformedURLException;
import java.net.Socket;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashSet;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import org.mortbay.io.Buffer;
import org.mortbay.jetty.Connector;
import org.mortbay.jetty.Handler;
import org.mortbay.jetty.HttpSchemes;
import org.mortbay.jetty.HttpURI;
import org.mortbay.jetty.Server;
import org.mortbay.jetty.bio.SocketConnector;
import org.mortbay.jetty.client.Address;
import org.mortbay.jetty.client.HttpClient;
import org.mortbay.jetty.client.HttpExchange;
import org.mortbay.jetty.handler.ContextHandlerCollection;
import org.mortbay.jetty.handler.DefaultHandler;
import org.mortbay.jetty.handler.HandlerCollection;
import org.mortbay.jetty.servlet.Context;
import org.mortbay.jetty.servlet.ServletHolder;
import org.mortbay.jetty.webapp.WebAppContext;
import org.mortbay.util.IO;
import org.mortbay.util.ajax.Continuation;
import org.mortbay.util.ajax.ContinuationSupport;
/**
* Asynchronous Proxy Servlet.
*
* Forward requests to another server either as a standard web proxy (as defined by
* RFC2616) or as a transparent proxy.
*
* This servlet needs the jetty-util and jetty-client classes to be available to
* the web application.
*
*/
public class AsyncProxyServlet implements Servlet
{
HttpClient _client;
protected HashSet _DontProxyHeaders = new HashSet();
{
_DontProxyHeaders.add("proxy-connection");
_DontProxyHeaders.add("connection");
_DontProxyHeaders.add("keep-alive");
_DontProxyHeaders.add("transfer-encoding");
_DontProxyHeaders.add("te");
_DontProxyHeaders.add("trailer");
_DontProxyHeaders.add("proxy-authorization");
_DontProxyHeaders.add("proxy-authenticate");
_DontProxyHeaders.add("upgrade");
}
private ServletConfig config;
private ServletContext context;
/* (non-Javadoc)
* @see javax.servlet.Servlet#init(javax.servlet.ServletConfig)
*/
public void init(ServletConfig config) throws ServletException
{
this.config=config;
this.context=config.getServletContext();
_client=new HttpClient();
//_client.setConnectorType(HttpClient.CONNECTOR_SOCKET);
_client.setConnectorType(HttpClient.CONNECTOR_SELECT_CHANNEL);
try
{
_client.start();
}
catch (Exception e)
{
throw new ServletException(e);
}
}
/* (non-Javadoc)
* @see javax.servlet.Servlet#getServletConfig()
*/
public ServletConfig getServletConfig()
{
return config;
}
/* (non-Javadoc)
* @see javax.servlet.Servlet#service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
*/
public void service(ServletRequest req, ServletResponse res) throws ServletException,
IOException
{
while (res instanceof HttpServletResponseWrapper)
res=(HttpServletResponse)((HttpServletResponseWrapper)res).getResponse();
final HttpServletRequest request = (HttpServletRequest)req;
final HttpServletResponse response = (HttpServletResponse)res;
if ("CONNECT".equalsIgnoreCase(request.getMethod()))
{
handleConnect(request,response);
}
else
{
final InputStream in=request.getInputStream();
final OutputStream out=response.getOutputStream();
final Continuation continuation = ContinuationSupport.getContinuation(request,request);
if (!continuation.isPending())
{
final byte[] buffer = new byte[4096]; // TODO avoid this!
String uri=request.getRequestURI();
if (request.getQueryString()!=null)
uri+="?"+request.getQueryString();
HttpURI url=proxyHttpURI(request.getScheme(),
request.getServerName(),
request.getServerPort(),
uri);
if (url==null)
{
response.sendError(HttpServletResponse.SC_FORBIDDEN);
return;
}
HttpExchange exchange = new HttpExchange()
{
protected void onRequestCommitted() throws IOException
{
}
protected void onRequestComplete() throws IOException
{
}
protected void onResponseComplete() throws IOException
{
continuation.resume();
}
protected void onResponseContent(Buffer content) throws IOException
{
// TODO Avoid this copy
while (content.hasContent())
{
int len=content.get(buffer,0,buffer.length);
out.write(buffer,0,len); // May block here for a little bit!
}
}
protected void onResponseHeaderComplete() throws IOException
{
}
protected void onResponseStatus(Buffer version, int status, Buffer reason) throws IOException
{
if (reason!=null && reason.length()>0)
response.setStatus(status,reason.toString());
else
response.setStatus(status);
}
protected void onResponseHeader(Buffer name, Buffer value) throws IOException
{
String s = name.toString().toLowerCase();
if (!_DontProxyHeaders.contains(s))
response.addHeader(name.toString(),value.toString());
}
};
exchange.setVersion(request.getProtocol());
exchange.setMethod(request.getMethod());
exchange.setURL(url.toString());
// check connection header
String connectionHdr = request.getHeader("Connection");
if (connectionHdr!=null)
{
connectionHdr=connectionHdr.toLowerCase();
if (connectionHdr.indexOf("keep-alive")<0 &&
connectionHdr.indexOf("close")<0)
connectionHdr=null;
}
// copy headers
boolean xForwardedFor=false;
boolean hasContent=false;
long contentLength=-1;
Enumeration enm = request.getHeaderNames();
while (enm.hasMoreElements())
{
// TODO could be better than this!
String hdr=(String)enm.nextElement();
String lhdr=hdr.toLowerCase();
if (_DontProxyHeaders.contains(lhdr))
continue;
if (connectionHdr!=null && connectionHdr.indexOf(lhdr)>=0)
continue;
if ("content-type".equals(lhdr))
hasContent=true;
if ("content-length".equals(lhdr))
contentLength=request.getContentLength();
Enumeration vals = request.getHeaders(hdr);
while (vals.hasMoreElements())
{
String val = (String)vals.nextElement();
if (val!=null)
{
exchange.setRequestHeader(lhdr,val);
xForwardedFor|="X-Forwarded-For".equalsIgnoreCase(hdr);
}
}
}
// Proxy headers
exchange.setRequestHeader("Via","1.1 (jetty)");
if (!xForwardedFor)
exchange.addRequestHeader("X-Forwarded-For",
request.getRemoteAddr());
if (hasContent)
exchange.setRequestContentSource(in);
_client.send(exchange);
continuation.suspend(30000);
}
}
}
/* ------------------------------------------------------------ */
/**
/** Resolve requested URL to the Proxied HttpURI
* @param scheme The scheme of the received request.
* @param serverName The server encoded in the received request(which
* may be from an absolute URL in the request line).
* @param serverPort The server port of the received request (which
* may be from an absolute URL in the request line).
* @param uri The URI of the received request.
* @return The HttpURI to which the request should be proxied.
* @throws MalformedURLException
*/
protected HttpURI proxyHttpURI(String scheme, String serverName, int serverPort, String uri)
throws MalformedURLException
{
return new HttpURI(scheme+"://"+serverName+":"+serverPort+uri);
}
/* ------------------------------------------------------------ */
public void handleConnect(HttpServletRequest request,
HttpServletResponse response)
throws IOException
{
String uri = request.getRequestURI();
String port = "";
String host = "";
int c = uri.indexOf(':');
if (c>=0)
{
port = uri.substring(c+1);
host = uri.substring(0,c);
if (host.indexOf('/')>0)
host = host.substring(host.indexOf('/')+1);
}
InetSocketAddress inetAddress = new InetSocketAddress (host, Integer.parseInt(port));
//if (isForbidden(HttpMessage.__SSL_SCHEME,addrPort.getHost(),addrPort.getPort(),false))
//{
// sendForbid(request,response,uri);
//}
//else
{
InputStream in=request.getInputStream();
OutputStream out=response.getOutputStream();
Socket socket = new Socket(inetAddress.getAddress(),inetAddress.getPort());
response.setStatus(200);
response.setHeader("Connection","close");
response.flushBuffer();
IO.copyThread(socket.getInputStream(),out);
IO.copy(in,socket.getOutputStream());
}
}
/* (non-Javadoc)
* @see javax.servlet.Servlet#getServletInfo()
*/
public String getServletInfo()
{
return "Proxy Servlet";
}
/* (non-Javadoc)
* @see javax.servlet.Servlet#destroy()
*/
public void destroy()
{
}
/**
* Transparent Proxy.
*
* This convenience extension to AsyncProxyServlet configures the servlet
* as a transparent proxy. The servlet is configured with init parameter:
* - ProxyTo - a URI like http://host:80/context to which the request is proxied.
*
- Prefix - a URI prefix that is striped from the start of the forwarded URI.
*
* For example, if a request was received at /foo/bar and the ProxyTo was http://host:80/context
* and the Prefix was /foo, then the request would be proxied to http://host:80/context/bar
*
*/
public static class Transparent extends AsyncProxyServlet
{
String _prefix;
String _proxyTo;
public Transparent()
{
}
public Transparent(String prefix,String server, int port)
{
_prefix=prefix;
_proxyTo="http://"+server+":"+port;
}
public void init(ServletConfig config) throws ServletException
{
if (config.getInitParameter("ProxyTo")!=null)
_proxyTo=config.getInitParameter("ProxyTo");
if (config.getInitParameter("Prefix")!=null)
_prefix=config.getInitParameter("Prefix");
if (_proxyTo==null)
throw new UnavailableException("No ProxyTo");
super.init(config);
config.getServletContext().log("Transparent AsyncProxyServlet @ "+(_prefix==null?"-":_prefix)+ " to "+_proxyTo);
}
protected HttpURI proxyHttpURI(final String scheme, final String serverName, int serverPort, final String uri) throws MalformedURLException
{
if (_prefix!=null && !uri.startsWith(_prefix))
return null;
if (_prefix!=null)
return new HttpURI(_proxyTo+uri.substring(_prefix.length()));
return new HttpURI(_proxyTo+uri);
}
}
}
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