1   /*
2    * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/oac.hc3x/trunk/src/test/org/apache/commons/httpclient/server/ProxyRequestHandler.java $
3    * $Revision: 1425331 $
4    * $Date: 2012-12-22 19:29:41 +0100 (Sat, 22 Dec 2012) $
5    *
6    * ====================================================================
7    *
8    *  Licensed to the Apache Software Foundation (ASF) under one or more
9    *  contributor license agreements.  See the NOTICE file distributed with
10   *  this work for additional information regarding copyright ownership.
11   *  The ASF licenses this file to You under the Apache License, Version 2.0
12   *  (the "License"); you may not use this file except in compliance with
13   *  the License.  You may obtain a copy of the License at
14   *
15   *      http://www.apache.org/licenses/LICENSE-2.0
16   *
17   *  Unless required by applicable law or agreed to in writing, software
18   *  distributed under the License is distributed on an "AS IS" BASIS,
19   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
20   *  See the License for the specific language governing permissions and
21   *  limitations under the License.
22   * ====================================================================
23   *
24   * This software consists of voluntary contributions made by many
25   * individuals on behalf of the Apache Software Foundation.  For more
26   * information on the Apache Software Foundation, please see
27   * <http://www.apache.org/>.
28   *
29   */
30  
31  package org.apache.commons.httpclient.server;
32  
33  import java.io.IOException;
34  import java.net.UnknownHostException;
35  
36  import org.apache.commons.httpclient.Header;
37  import org.apache.commons.httpclient.HttpException;
38  import org.apache.commons.httpclient.HttpStatus;
39  import org.apache.commons.httpclient.HttpVersion;
40  import org.apache.commons.httpclient.URI;
41  import org.apache.commons.httpclient.URIException;
42  import org.apache.commons.logging.Log;
43  import org.apache.commons.logging.LogFactory;
44  
45  /***
46   * @author Ortwin Glueck
47   * @author Oleg Kalnichevski
48   */
49  public class ProxyRequestHandler implements HttpRequestHandler {
50  
51      private static final Log LOG = LogFactory.getLog(ProxyRequestHandler.class);
52  
53      private SimpleConnManager connmanager = null;
54      
55      public ProxyRequestHandler(final SimpleConnManager connmanager) {
56          super();
57          if (connmanager == null) {
58              throw new IllegalArgumentException("Connection manager may not be null");
59          }
60          this.connmanager = connmanager;
61      }
62      
63  	/***
64  	 * @see org.apache.commons.httpclient.server.HttpRequestHandler#processRequest(org.apache.commons.httpclient.server.SimpleHttpServerConnection)
65  	 */
66  	public boolean processRequest(
67          final SimpleHttpServerConnection conn,
68          final SimpleRequest request) throws IOException
69      {
70          httpProxy(conn, request);
71          return true;
72  	}
73  
74  	private void httpProxy(
75          final SimpleHttpServerConnection conn,
76          final SimpleRequest request) throws IOException {
77  
78          RequestLine oldreqline = request.getRequestLine();
79          URI uri = null;
80          SimpleHost host = null;
81          try {
82              uri = new URI(oldreqline.getUri(), true);
83              host = new SimpleHost(uri.getHost(), uri.getPort());
84          } catch (URIException ex) {
85              SimpleResponse response = ErrorResponse.getResponse(HttpStatus.SC_BAD_REQUEST);
86              conn.writeResponse(response);
87              return;
88          }
89          SimpleHttpServerConnection proxyconn = null;
90          try {
91              proxyconn = this.connmanager.openConnection(host);
92          } catch (UnknownHostException e) {
93              SimpleResponse response = ErrorResponse.getResponse(HttpStatus.SC_NOT_FOUND);
94              conn.writeResponse(response);
95              return;
96          }
97          try {
98              proxyconn.setSocketTimeout(0);
99              // Rewrite target url
100             RequestLine newreqline = new RequestLine(
101                     oldreqline.getMethod(), 
102                     uri.getEscapedPath(), 
103                     oldreqline.getHttpVersion()); 
104             request.setRequestLine(newreqline);
105             // Remove proxy-auth headers if present
106             request.removeHeaders("Proxy-Authorization");
107             // Manage connection persistence
108             Header connheader = request.getFirstHeader("Proxy-Connection");
109             if (connheader != null) {
110                 if (connheader.getValue().equalsIgnoreCase("close")) {
111                     request.setHeader(new Header("Connection", "close"));
112                 }
113             }
114             request.removeHeaders("Proxy-Connection");
115             
116             proxyconn.writeRequest(request);
117             
118             SimpleResponse response = proxyconn.readResponse();
119             if (response == null) {
120                 return;
121             }
122             response.setHeader(new Header("Via", "1.1 test (Test-Proxy)"));
123             connheader = response.getFirstHeader("Connection");
124             if (connheader != null) {
125                 String s = connheader.getValue(); 
126                 if (s.equalsIgnoreCase("close")) {
127                     response.setHeader(new Header("Proxy-Connection", "close"));
128                     conn.setKeepAlive(false);
129                     proxyconn.setKeepAlive(false);
130                     response.removeHeaders("Connection");
131                 }
132                 if (s.equalsIgnoreCase("keep-alive")) {
133                     response.setHeader(new Header("Proxy-Connection", "keep-alive"));
134                     conn.setKeepAlive(true);
135                     proxyconn.setKeepAlive(true);
136                     response.removeHeaders("Connection");
137                 }
138             } else {
139                 // Use protocol default connection policy
140                 if (response.getHttpVersion().greaterEquals(HttpVersion.HTTP_1_1)) {
141                     conn.setKeepAlive(true);
142                     proxyconn.setKeepAlive(true);
143                 } else {
144                     conn.setKeepAlive(false);
145                     proxyconn.setKeepAlive(false);
146                 }
147             }
148             if ("HEAD".equalsIgnoreCase(request.getRequestLine().getMethod())) {
149                 // this is a head request, we don't want to send the actualy content
150                 response.setBody(null);
151             }
152             conn.writeResponse(response);
153 
154         } catch (HttpException e) {
155             SimpleResponse response = ErrorResponse.getResponse(HttpStatus.SC_BAD_REQUEST);
156             conn.writeResponse(response);
157             proxyconn.setKeepAlive(false);
158         } catch (IOException e) {
159             LOG.warn(e.getMessage());
160             proxyconn.setKeepAlive(false);
161         } finally {
162             this.connmanager.releaseConnection(host, proxyconn);
163         }
164 	}
165     
166 }