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1 package org.roller.presentation.velocity;
2
3 import javax.servlet.http.HttpServletRequest  ;
4 import javax.servlet.http.HttpServletResponse ;
5 import javax.servlet.http.HttpSession ;
6 import org.apache.velocity.context.Context;
7 import org.roller.pojos.CommentData;
8 import org.roller.presentation.RollerSession;
9 import org.apache.commons.logging.Log;
10 import org.apache.commons.logging.LogFactory;
11 import java.util.ResourceBundle ;
12
13
17 public class MathCommentAuthenticator implements CommentAuthenticator
18 {
19 private transient ResourceBundle bundle =
20 ResourceBundle.getBundle("ApplicationResources");
21
22 private static Log mLogger =
23 LogFactory.getFactory().getInstance(MathCommentAuthenticator.class);
24
25 public String getHtml(
26 Context context,
27 HttpServletRequest request,
28 HttpServletResponse response)
29 {
30 String answer = "";
31 HttpSession session = request.getSession();
32 if (session.getAttribute("mathAnswer") == null)
33 {
34 int value1 = (int)(Math.random()*10.0);
36 int value2 = (int)(Math.random()*100.0);
37 int sum = value1 + value2;
38 session.setAttribute("mathValue1", new Integer (value1));
39 session.setAttribute("mathValue2", new Integer (value2));
40 session.setAttribute("mathAnswer", new Integer (sum));
41 }
42 else
43 {
44 answer = request.getParameter("answer");
46 answer = (answer == null) ? "" : answer;
47 }
48
49 Integer value1o =
51 (Integer )request.getSession().getAttribute("mathValue1");
52 Integer value2o =
53 (Integer )request.getSession().getAttribute("mathValue2");
54
55 StringBuffer sb = new StringBuffer ();
56
57 sb.append("<p>");
58 sb.append(bundle.getString("comments.mathAuthenticatorQuestion"));
59 sb.append("</p><p>");
60 sb.append(value1o);
61 sb.append(" + ");
62 sb.append(value2o);
63 sb.append(" = ");
64 sb.append("<input name=\"answer\" value=\"");
65 sb.append(answer);
66 sb.append("\" /></p>");
67
68 return sb.toString();
69 }
70
71 public boolean authenticate(
72 CommentData comment,
73 HttpServletRequest request)
74 {
75 boolean ret = false;
76 String answerString = request.getParameter("answer");
77 if (answerString != null || answerString.trim().length()==0)
78 {
79 try
80 {
81 int answer = Integer.parseInt(answerString);
82 Integer sum =
83 (Integer )request.getSession().getAttribute("mathAnswer");
84 if (answer == sum.intValue())
85 {
86 ret = true;
87 request.getSession().removeAttribute("mathAnswer");
88 request.getSession().removeAttribute("mathValue1");
89 request.getSession().removeAttribute("mathValue2");
90 }
91 }
92 catch (NumberFormatException ignored) {}
93 catch (Exception e)
94 {
95 mLogger.error(e);
96 }
97 }
98 return ret;
99 }
100 }
101
102 |
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