Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/ProxyServlet.java @ 4740:fb135e1dfa35

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Added 'type' attribute to <dc:variable/> element. If an optional 'type' attribute is given the result of the XPATH expression is interpreted as this type. Valid values are 'number', 'bool', 'node' and 'nodeset'. All other defaults to 'string' which also is the default if nor type is given.
author Sascha L. Teichmann <teichmann@intevation.de>
date Wed, 02 Jan 2013 15:31:53 +0100
parents 92239b53823f
children
rev   line source
3497
88feb3347aa5 Implement a ProxyServlet
Bjoern Ricks <bjoern.ricks@intevation.de>
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1 package de.intevation.flys.client.server;
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2
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3 import java.io.InputStream;
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4 import java.io.IOException;
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5 import java.io.OutputStream;
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6 import java.util.Enumeration;
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7
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8 import javax.servlet.ServletConfig;
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9 import javax.servlet.http.HttpServlet;
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10 import javax.servlet.http.HttpServletRequest;
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11 import javax.servlet.http.HttpServletResponse;
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12 import javax.servlet.http.HttpSession;
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13
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14 import org.apache.http.Header;
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15 import org.apache.http.HttpEntity;
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16 import org.apache.http.HttpResponse;
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17 import org.apache.http.StatusLine;
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18 import org.apache.http.client.HttpClient;
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19 import org.apache.http.client.methods.HttpGet;
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20 import org.apache.http.impl.client.DefaultHttpClient;
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21
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22 import org.apache.log4j.Logger;
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23
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24 import de.intevation.flys.client.server.auth.User;
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25
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26 /**
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27 * Implements a Proxy for HTTP Requests
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28 */
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29 public class ProxyServlet
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30 extends HttpServlet
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31 {
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32 private static Logger logger = Logger.getLogger(ProxyServlet.class);
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33 private String remoteurl;
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34
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35 @Override
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36 public void init(ServletConfig config) {
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37 this.remoteurl = config.getInitParameter("remoteurl");
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38 }
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39
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40 @Override
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41 public void doPost(HttpServletRequest req, HttpServletResponse resp) {
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42 }
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43
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44 @Override
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45 public void doGet(HttpServletRequest req, HttpServletResponse resp)
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46 throws IOException {
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47 HttpClient httpclient = new DefaultHttpClient();
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48
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49 String requesturi = req.getRequestURI();
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50 String query = req.getQueryString();
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51
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52 HttpGet httpget = new HttpGet(this.remoteurl + "?" + query);
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53
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54 boolean debug = logger.isDebugEnabled();
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55
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56 for (Enumeration e = req.getHeaderNames(); e.hasMoreElements();) {
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57 String name = (String)e.nextElement();
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58 for (Enumeration f = req.getHeaders(name); f.hasMoreElements();) {
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59 String value = (String)f.nextElement();
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60 if (debug) {
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61 logger.debug(
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62 "Adding request header " + name + " : " + value);
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63 }
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64 httpget.addHeader(name, value);
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65 }
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66 }
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67
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68 HttpResponse response = httpclient.execute(httpget);
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69
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70 StatusLine statusline = response.getStatusLine();
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71 if (debug) {
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72 logger.debug("Response statuscode " + statusline.getStatusCode());
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73 }
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74 resp.setStatus(statusline.getStatusCode());
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75
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76 Header[] headers = response.getAllHeaders();
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77 for(Header header : headers) {
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78 if (debug) {
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79 logger.debug(
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80 "Adding response header " + header.getName() +
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81 " : " + header.getValue());
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82 }
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83 resp.setHeader(header.getName(), header.getValue());
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84 }
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85
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86 HttpEntity entity = response.getEntity();
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87 if (entity != null) {
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88 InputStream instream = entity.getContent();
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89 byte [] buf = new byte[4096];
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90 try {
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91 OutputStream outstream = resp.getOutputStream();
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92 try {
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93 int read;
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94 while ((read = instream.read(buf)) >= 0) {
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95 outstream.write(buf, 0, read);
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96 }
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97 outstream.flush();
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98 }
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99 finally {
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100 outstream.close();
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101 }
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102 }
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103 finally {
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104 instream.close();
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105 }
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106 }
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107 }
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108
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109 private User getUser(HttpServletRequest req) {
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110 HttpSession session = req.getSession();
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111 return (User)session.getAttribute("user");
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112 }
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113 }
http://dive4elements.wald.intevation.org