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annotate flys-client/src/main/java/de/intevation/flys/client/server/LoginServlet.java @ 4215:c179cd02177d

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Logout the current user Add code to the logout button to remove the current user from the session and to redirect the browser window to the login page. Part of flys/issue916 (Logout: "Abmelden" Knopf mit Funktion belegen)
author Björn Ricks <bjoern.ricks@intevation.de>
date Tue, 23 Oct 2012 09:59:16 +0200
parents 17fe00c09b7c
children 0074c113bb95
rev   line source
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1 package de.intevation.flys.client.server;
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2
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3 import java.io.IOException;
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4
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5 import javax.servlet.ServletException;
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6 import javax.servlet.ServletContext;
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7 import javax.servlet.http.HttpServlet;
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8 import javax.servlet.http.HttpServletRequest;
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9 import javax.servlet.http.HttpServletResponse;
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10 import javax.servlet.http.HttpSession;
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11
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12 import org.apache.log4j.Logger;
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13
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14 import de.intevation.flys.client.server.auth.Authentication;
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15 import de.intevation.flys.client.server.auth.AuthenticationException;
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16 import de.intevation.flys.client.server.auth.AuthenticationFactory;
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17 import de.intevation.flys.client.server.auth.User;
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18 import de.intevation.flys.client.server.auth.UserClient;
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19 import de.intevation.flys.client.server.features.Features;
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20
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21 public class LoginServlet extends HttpServlet {
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22
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23 private static Logger logger = Logger.getLogger(LoginServlet.class);
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24
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25 private void redirectFailure(HttpServletResponse resp, String path)
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26 throws IOException {
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27 resp.sendRedirect(path + "/login.jsp");
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28 }
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29
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30 private void redirectFailure(HttpServletResponse resp, String path,
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31 Exception e) throws IOException {
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32 this.redirectFailure(resp, path, e.getMessage());
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33 }
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34
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35 private void redirectFailure(HttpServletResponse resp, String path,
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36 String message) throws IOException {
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37 resp.sendRedirect(path + "/login.jsp?error=" + message);
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38 }
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39
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40 private void redirectSuccess(HttpServletResponse resp, String path,
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41 String uri) throws IOException {
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42 if (uri == null) {
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43 String redirecturl = getServletContext().getInitParameter("redirect-url");
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44
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45 uri = "/" + redirecturl;
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46 }
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47 resp.sendRedirect(uri);
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48 }
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49
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50 @Override
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51 protected void doGet(HttpServletRequest req, HttpServletResponse resp)
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52 throws ServletException, IOException {
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53 logger.debug("Processing get request");
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54 this.redirectFailure(resp, req.getContextPath());
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55 }
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56
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57 @Override
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58 protected void doPost(HttpServletRequest req, HttpServletResponse resp)
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59 throws ServletException, IOException
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60 {
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61 String encoding = req.getCharacterEncoding();
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62 String username = req.getParameter("username");
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63 String password = req.getParameter("password");
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64
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65 logger.debug("Processing post request");
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66
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67 if (username == null || password == null) {
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68 logger.debug("No username or password provided");
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69 this.redirectFailure(resp, req.getContextPath());
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70 return;
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71 }
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72
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73 try {
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74 Authentication aresp = this.auth(username, password, encoding);
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75 if (aresp == null || !aresp.isSuccess()) {
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76 logger.debug("Authentication not successful");
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77 this.redirectFailure(resp, req.getContextPath());
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78 }
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79 User user = aresp.getUser();
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80
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81 String url = getServletContext().getInitParameter("server-url");
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82 UserClient client = new UserClient(url);
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83 if (!client.userExists(user)) {
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84 logger.debug("Creating db user");
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85 if (!client.createUser(user)) {
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86 this.redirectFailure(resp, req.getContextPath(),
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87 "Could not create new user");
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88 }
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89 }
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90
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91 HttpSession session = req.getSession();
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92 session.setAttribute("user", user);
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93
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94 String uri = (String)session.getAttribute("requesturi");
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95
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96 this.redirectSuccess(resp, req.getContextPath(), uri);
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97 }
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98 catch(AuthenticationException e) {
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99 logger.error(e);
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100 this.redirectFailure(resp, req.getContextPath(), e);
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101 }
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102 }
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103
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104 private Authentication auth(String username, String password, String encoding)
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105 throws AuthenticationException, IOException
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106 {
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107 ServletContext sc = this.getServletContext();
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108 Features features = (Features)sc.getAttribute(Features.CONTEXT_ATTRIBUTE);
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109 String auth = sc.getInitParameter("authentication");
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110 return AuthenticationFactory.getInstance(auth).auth(username, password, encoding, features);
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111 }
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112 }
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