Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/ProxyServlet.java @ 4278:efc731efa4a3

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Documentation added.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Fri, 26 Oct 2012 16:42:51 +0200
parents 92239b53823f
children
rev   line source
3497
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
1 package de.intevation.flys.client.server;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
2
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
3 import java.io.InputStream;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
4 import java.io.IOException;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
5 import java.io.OutputStream;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
6 import java.util.Enumeration;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
7
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
8 import javax.servlet.ServletConfig;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
9 import javax.servlet.http.HttpServlet;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
10 import javax.servlet.http.HttpServletRequest;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
11 import javax.servlet.http.HttpServletResponse;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
12 import javax.servlet.http.HttpSession;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
13
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
14 import org.apache.http.Header;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
15 import org.apache.http.HttpEntity;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
16 import org.apache.http.HttpResponse;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
17 import org.apache.http.StatusLine;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
18 import org.apache.http.client.HttpClient;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
19 import org.apache.http.client.methods.HttpGet;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
20 import org.apache.http.impl.client.DefaultHttpClient;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
21
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
22 import org.apache.log4j.Logger;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
23
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
24 import de.intevation.flys.client.server.auth.User;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
25
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
26 /**
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
27 * Implements a Proxy for HTTP Requests
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
28 */
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
29 public class ProxyServlet
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
30 extends HttpServlet
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
31 {
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
32 private static Logger logger = Logger.getLogger(ProxyServlet.class);
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
33 private String remoteurl;
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
34
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
35 @Override
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
36 public void init(ServletConfig config) {
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
37 this.remoteurl = config.getInitParameter("remoteurl");
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
38 }
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
39
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
40 @Override
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
41 public void doPost(HttpServletRequest req, HttpServletResponse resp) {
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
42 }
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
43
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
44 @Override
3498
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
45 public void doGet(HttpServletRequest req, HttpServletResponse resp)
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
46 throws IOException {
3497
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
47 HttpClient httpclient = new DefaultHttpClient();
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
48
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
49 String requesturi = req.getRequestURI();
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
50 String query = req.getQueryString();
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
51
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
52 HttpGet httpget = new HttpGet(this.remoteurl + "?" + query);
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
53
3498
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
54 boolean debug = logger.isDebugEnabled();
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
55
3497
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
56 for (Enumeration e = req.getHeaderNames(); e.hasMoreElements();) {
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
57 String name = (String)e.nextElement();
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
58 for (Enumeration f = req.getHeaders(name); f.hasMoreElements();) {
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
59 String value = (String)f.nextElement();
3498
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
60 if (debug) {
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
61 logger.debug(
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
62 "Adding request header " + name + " : " + value);
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
63 }
3497
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
64 httpget.addHeader(name, value);
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
65 }
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
66 }
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
67
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
68 HttpResponse response = httpclient.execute(httpget);
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
69
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
70 StatusLine statusline = response.getStatusLine();
3498
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
71 if (debug) {
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
72 logger.debug("Response statuscode " + statusline.getStatusCode());
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
73 }
3497
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
74 resp.setStatus(statusline.getStatusCode());
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
75
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
76 Header[] headers = response.getAllHeaders();
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
77 for(Header header : headers) {
3498
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
78 if (debug) {
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
79 logger.debug(
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
80 "Adding response header " + header.getName() +
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
81 " : " + header.getValue());
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
82 }
3497
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
83 resp.setHeader(header.getName(), header.getValue());
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
84 }
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
85
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
86 HttpEntity entity = response.getEntity();
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
87 if (entity != null) {
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
88 InputStream instream = entity.getContent();
3498
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
89 byte [] buf = new byte[4096];
3497
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
90 try {
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
91 OutputStream outstream = resp.getOutputStream();
3498
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
92 try {
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
93 int read;
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
94 while ((read = instream.read(buf)) >= 0) {
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
95 outstream.write(buf, 0, read);
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
96 }
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
97 outstream.flush();
3497
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
98 }
3498
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
99 finally {
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
100 outstream.close();
92239b53823f ProxyServlet: Use block instead of byte wise copy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3497
diff changeset
101 }
3497
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
102 }
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
103 finally {
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
104 instream.close();
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
105 }
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
106 }
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
107 }
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
108
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
109 private User getUser(HttpServletRequest req) {
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
110 HttpSession session = req.getSession();
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
111 return (User)session.getAttribute("user");
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
112 }
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
parents:
diff changeset
113 }
http://dive4elements.wald.intevation.org