Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/ProxyServlet.java @ 3497:88feb3347aa5

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Implement a ProxyServlet Implement a ProxyServlet to be able to restrict the access to the mapserver too. All queries to the provided map services should go throught this new ProxyServlet. Currently the ProxyServlet can only handle HTTP GET requests. flys-client/trunk@5221 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Bjoern Ricks <bjoern.ricks@intevation.de>
date Thu, 16 Aug 2012 14:42:36 +0000
parents
children 92239b53823f
rev   line source
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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.BufferedInputStream;
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4 import java.io.InputStream;
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5 import java.io.IOException;
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6 import java.io.OutputStream;
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7 import java.util.Enumeration;
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8
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9 import javax.servlet.ServletConfig;
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10 import javax.servlet.http.HttpServlet;
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11 import javax.servlet.http.HttpServletRequest;
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12 import javax.servlet.http.HttpServletResponse;
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13 import javax.servlet.http.HttpSession;
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14
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15 import org.apache.http.Header;
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16 import org.apache.http.HttpEntity;
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17 import org.apache.http.HttpResponse;
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18 import org.apache.http.StatusLine;
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19 import org.apache.http.client.HttpClient;
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20 import org.apache.http.client.methods.HttpGet;
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21 import org.apache.http.impl.client.DefaultHttpClient;
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22
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23 import org.apache.log4j.Logger;
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24
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25 import de.intevation.flys.client.server.auth.User;
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26
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27 /**
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28 * Implements a Proxy for HTTP Requests
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29 */
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30 public class ProxyServlet
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31 extends HttpServlet
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32 {
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33 private static Logger logger = Logger.getLogger(ProxyServlet.class);
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34 private String remoteurl;
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35
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36 @Override
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37 public void init(ServletConfig config) {
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38 this.remoteurl = config.getInitParameter("remoteurl");
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39 }
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40
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41 @Override
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42 public void doPost(HttpServletRequest req, HttpServletResponse resp) {
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43 }
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44
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45 @Override
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46 public void doGet(HttpServletRequest req, HttpServletResponse resp) 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 for (Enumeration e = req.getHeaderNames(); e.hasMoreElements();) {
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55 String name = (String)e.nextElement();
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56 for (Enumeration f = req.getHeaders(name); f.hasMoreElements();) {
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57 String value = (String)f.nextElement();
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58 logger.debug("Adding request header " + name + " : " + value);
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59 httpget.addHeader(name, value);
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60 }
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61 }
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62
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63 HttpResponse response = httpclient.execute(httpget);
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64
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65 StatusLine statusline = response.getStatusLine();
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66 logger.debug("Response statuscode " + statusline.getStatusCode());
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67 resp.setStatus(statusline.getStatusCode());
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68
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69 Header[] headers = response.getAllHeaders();
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70 for(Header header : headers) {
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71 logger.debug("Adding response header " + header.getName() + " : " + header.getValue());
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72 resp.setHeader(header.getName(), header.getValue());
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73 }
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74
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75 HttpEntity entity = response.getEntity();
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76 if (entity != null) {
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77 InputStream instream = entity.getContent();
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78 BufferedInputStream binstream = new BufferedInputStream(instream);
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79 try {
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80 OutputStream outstream = resp.getOutputStream();
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81 int read;
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82 while ( ( read = binstream.read() ) != -1 ) {
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83 outstream.write(read);
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84 }
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85 outstream.close();
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86 }
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87 finally {
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88 instream.close();
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89 }
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90 }
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91 }
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92
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93 private User getUser(HttpServletRequest req) {
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94 HttpSession session = req.getSession();
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95 return (User)session.getAttribute("user");
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96 }
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97 }
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