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annotate flys-client/src/main/java/de/intevation/flys/client/server/ProxyServlet.java @ 5720:aa1a43f5c03a

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author Andre Heinecke <aheinecke@intevation.de>
date Mon, 15 Apr 2013 18:32:37 +0200
parents 92239b53823f
children
rev   line source
3497
88feb3347aa5 Implement a ProxyServlet
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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 }
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