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1
31 package org.blojsom.plugin.comment;
32
33 import org.blojsom.blog.Blog;
34 import org.blojsom.blog.Entry;
35 import org.blojsom.plugin.PluginException;
36 import org.blojsom.plugin.comment.event.CommentResponseSubmissionEvent;
37 import org.blojsom.util.BlojsomUtils;
38 import org.blojsom.event.Listener;
39 import org.blojsom.event.Event;
40 import org.blojsom.event.EventBroadcaster;
41 import org.apache.commons.logging.Log;
42 import org.apache.commons.logging.LogFactory;
43
44 import javax.servlet.http.HttpServletRequest  ;
45 import javax.servlet.http.HttpServletResponse ;
46 import javax.servlet.http.HttpSession ;
47 import java.util.HashMap ;
48 import java.util.Map ;
49 import java.util.Iterator ;
50
51
58 public class MathCommentAuthenticationPlugin extends CommentModerationPlugin implements Listener {
59
60 private Log _logger = LogFactory.getLog(MathCommentAuthenticationPlugin.class);
61
62 private static final String MATH_COMMENT_MODERATION_ENABLED = "math-comment-moderation-enabled";
63 private static final String MATH_COMMENT_AUTHENTICATION_OPERATIONS_IP = "math-comment-authentication-operations";
64 private static final String MATH_COMMENT_AUTHENTICATION_BOUND_IP = "math-comment-authentication-bound";
65
66 private static final int AVAILABLE_OPERATIONS = 3;
67 private static final int BOUND_DEFAULT = 10;
68
69 public static final String BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_ANSWER = "BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_ANSWER";
70 public static final String BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_VALUE1 = "BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_VALUE1";
71 public static final String BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_VALUE2 = "BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_VALUE2";
72 public static final String BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_OPERATION = "BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_OPERATION";
73 public static final String BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_ANSWER_CHECK_PARAM = "mathAnswerCheck";
74 public static final String BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_STATUS_MESSAGE = "BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_STATUS_MESSAGE";
75
76 private EventBroadcaster _eventBroadcaster;
77
78
81 public MathCommentAuthenticationPlugin() {
82 }
83
84
89 public void setEventBroadcaster(EventBroadcaster eventBroadcaster) {
90 _eventBroadcaster = eventBroadcaster;
91 }
92
93
98 public void init() throws PluginException {
99 super.init();
100
101 _eventBroadcaster.addListener(this);
102 }
103
104
115 public Entry[] process(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Blog blog, Map context, Entry[] entries) throws PluginException {
116 HttpSession httpSession = httpServletRequest.getSession();
117
118 int bound = BOUND_DEFAULT;
119 int availableOperations = AVAILABLE_OPERATIONS;
120 String boundProperty = blog.getProperty(MATH_COMMENT_AUTHENTICATION_BOUND_IP);
121 String availableOperationsProperty = blog.getProperty(MATH_COMMENT_AUTHENTICATION_OPERATIONS_IP);
122
123 if (!BlojsomUtils.checkNullOrBlank(boundProperty)) {
124 try {
125 bound = Integer.parseInt(boundProperty);
126 } catch (NumberFormatException e) {
127 }
128 }
129
130 if (!BlojsomUtils.checkNullOrBlank(availableOperationsProperty)) {
131 try {
132 availableOperations = Integer.parseInt(availableOperationsProperty);
133 if (availableOperations < 1 || availableOperations > AVAILABLE_OPERATIONS) {
134 availableOperations = AVAILABLE_OPERATIONS;
135 } else {
136 availableOperations -= 1;
137 }
138 } catch (NumberFormatException e) {
139 }
140 }
141
142 int operation = (int) (Math.random() * (availableOperations + 1));
143 int value1 = (int) (Math.random() * bound);
144 int value2 = (int) (Math.random() * bound);
145 int answer;
146
147 answer = getAnswerForOperation(value1, value2, operation);
148
149 httpSession.setAttribute(BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_VALUE1, new Integer (value1));
150 httpSession.setAttribute(BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_VALUE2, new Integer (value2));
151 httpSession.setAttribute(BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_ANSWER, new Integer (answer));
152 httpSession.setAttribute(BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_OPERATION, getOperatorForOperation(operation));
153
154 return entries;
155 }
156
157
168 protected void moderateComment(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Blog blog, Map context, Entry[] entries) throws PluginException {
169 if ("true".equalsIgnoreCase(blog.getProperty(COMMENT_MODERATION_ENABLED)) &&
170 "true".equalsIgnoreCase(blog.getProperty(MATH_COMMENT_MODERATION_ENABLED))) {
171 HttpSession httpSession = httpServletRequest.getSession();
172
173 if ("y".equalsIgnoreCase(httpServletRequest.getParameter(CommentPlugin.COMMENT_PARAM)) && blog.getBlogCommentsEnabled().booleanValue()) {
174 String mathAnswerCheck = BlojsomUtils.getRequestValue(BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_ANSWER_CHECK_PARAM, httpServletRequest);
175
176 boolean passedCheck = false;
177 if (httpSession.getAttribute(BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_ANSWER) != null) {
178 Integer mathAnswer = (Integer ) httpSession.getAttribute(BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_ANSWER);
179
180 try {
181 int mathAnswerCheckValue = Integer.parseInt(mathAnswerCheck);
182 int originalMathAnswerValue = mathAnswer.intValue();
183
184 if (mathAnswerCheckValue == originalMathAnswerValue) {
185 passedCheck = true;
186 }
187 } catch (NumberFormatException e) {
188 }
189 }
190
191 Map commentMetaData;
192 if (context.containsKey(CommentPlugin.BLOJSOM_PLUGIN_COMMENT_METADATA)) {
193 commentMetaData = (Map ) context.get(CommentPlugin.BLOJSOM_PLUGIN_COMMENT_METADATA);
194 } else {
195 commentMetaData = new HashMap ();
196 }
197
198 if (!passedCheck) {
199 commentMetaData.put(CommentPlugin.BLOJSOM_PLUGIN_COMMENT_METADATA_DESTROY, Boolean.TRUE);
200 httpServletRequest.setAttribute(BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_STATUS_MESSAGE, "Failed math comment authentication check.");
201 } else {
202 commentMetaData.put(CommentModerationPlugin.BLOJSOM_COMMENT_MODERATION_PLUGIN_APPROVED, Boolean.TRUE.toString());
203 httpServletRequest.setAttribute(BLOJSOM_MATH_AUTHENTICATOR_PLUGIN_STATUS_MESSAGE, "Passed math comment authentication check.");
204 }
205
206 context.put(CommentPlugin.BLOJSOM_PLUGIN_COMMENT_METADATA, commentMetaData);
207 }
208 }
209 }
210
211
219 protected int getAnswerForOperation(int value1, int value2, int operation) {
220 int answer;
221
222 switch (operation) {
223 case 0:
224 {
225 answer = value1 + value2;
226 break;
227 }
228 case 1:
229 {
230 answer = value1 - value2;
231 break;
232 }
233 case 2:
234 {
235 answer = value1 * value2;
236 break;
237 }
238 default:
239 {
240 answer = value1 + value2;
241 }
242 }
243
244 return answer;
245 }
246
247
253 protected String getOperatorForOperation(int operation) {
254 switch (operation) {
255 case 0:
256 {
257 return "+";
258 }
259 case 1:
260 {
261 return "-";
262 }
263 case 2:
264 {
265 return "*";
266 }
267 default:
268 {
269 return "+";
270 }
271 }
272 }
273
274
279 public void handleEvent(Event event) {
280 }
281
282
287 public void processEvent(Event event) {
288 if (event instanceof CommentResponseSubmissionEvent) {
289 CommentResponseSubmissionEvent commentResponseSubmissionEvent = (CommentResponseSubmissionEvent) event;
290
291 try {
292 HashMap context = new HashMap ();
293 moderateComment(commentResponseSubmissionEvent.getHttpServletRequest(),
294 commentResponseSubmissionEvent.getHttpServletResponse(), commentResponseSubmissionEvent.getBlog(),
295 context,
296 new Entry[] {commentResponseSubmissionEvent.getEntry()});
297
298 Map operationMetadata = (Map ) context.get(CommentPlugin.BLOJSOM_PLUGIN_COMMENT_METADATA);
300 Map commentMetadata = commentResponseSubmissionEvent.getMetaData();
301
302 Iterator keys = operationMetadata.keySet().iterator();
303 while (keys.hasNext()) {
304 Object key = keys.next();
305 commentMetadata.put(key.toString(), operationMetadata.get(key).toString());
306 }
307 } catch (PluginException e) {
308 if (_logger.isErrorEnabled()) {
309 _logger.error(e);
310 }
311 }
312 }
313 }
314 } |
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