001: /**
002: * Copyright (c) 2003-2007, David A. Czarnecki
003: * All rights reserved.
004: *
005: * Redistribution and use in source and binary forms, with or without
006: * modification, are permitted provided that the following conditions are met:
007: *
008: * Redistributions of source code must retain the above copyright notice, this list of conditions and the
009: * following disclaimer.
010: * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
011: * following disclaimer in the documentation and/or other materials provided with the distribution.
012: * Neither the name of "David A. Czarnecki" and "blojsom" nor the names of its contributors may be used to
013: * endorse or promote products derived from this software without specific prior written permission.
014: * Products derived from this software may not be called "blojsom", nor may "blojsom" appear in their name,
015: * without prior written permission of David A. Czarnecki.
016: *
017: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
018: * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
019: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
020: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
021: * EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
022: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
023: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
025: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
026: * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
027: * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
028: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
029: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
030: */package org.blojsom.plugin.moderation;
031:
032: import org.apache.commons.logging.Log;
033: import org.apache.commons.logging.LogFactory;
034: import org.blojsom.blog.Blog;
035: import org.blojsom.blog.Entry;
036: import org.blojsom.event.Event;
037: import org.blojsom.event.EventBroadcaster;
038: import org.blojsom.event.Listener;
039: import org.blojsom.plugin.Plugin;
040: import org.blojsom.plugin.PluginException;
041: import org.blojsom.plugin.comment.CommentModerationPlugin;
042: import org.blojsom.plugin.comment.CommentPlugin;
043: import org.blojsom.plugin.comment.event.CommentResponseSubmissionEvent;
044: import org.blojsom.plugin.pingback.PingbackPlugin;
045: import org.blojsom.plugin.pingback.event.PingbackResponseSubmissionEvent;
046: import org.blojsom.plugin.response.event.ResponseSubmissionEvent;
047: import org.blojsom.plugin.trackback.TrackbackModerationPlugin;
048: import org.blojsom.plugin.trackback.TrackbackPlugin;
049: import org.blojsom.plugin.trackback.event.TrackbackResponseSubmissionEvent;
050:
051: import javax.servlet.http.HttpServletRequest;
052: import javax.servlet.http.HttpServletResponse;
053: import java.net.InetAddress;
054: import java.net.UnknownHostException;
055: import java.util.Map;
056:
057: /**
058: * Open proxy check plugin for comments and trackbacks. This plugin queries the <a href="http://dsbl.org/main">Distributed
059: * Sender Blackhole List</a> if a comment or trackback is submitted. If the IP address of the requesting
060: * host is on the blacklist, the comment or trackback is marked for moderation if moderation is enabled,
061: * otherwise it is destroyed.
062: * This plugin can work in conjunction with other moderation plugins as it looks for the comment or
063: * trackback metadata.
064: *
065: * @author David Czarnecki
066: * @version $Id: OpenProxyModerationPlugin.java,v 1.2 2007/01/17 02:35:12 czarneckid Exp $
067: * @since blojsom 3.0
068: */
069: public class OpenProxyModerationPlugin implements Plugin, Listener {
070:
071: private Log _logger = LogFactory
072: .getLog(OpenProxyModerationPlugin.class);
073:
074: private static final String DELETE_OPENPROXY_SPAM_IP = "delete-openproxy-spam";
075:
076: private EventBroadcaster _eventBroadcaster;
077:
078: /**
079: * Create a new instance of the open proxy comment check plugin
080: */
081: public OpenProxyModerationPlugin() {
082: }
083:
084: /**
085: * Set the {@link EventBroadcaster} event broadcaster
086: *
087: * @param eventBroadcaster {@link EventBroadcaster}
088: */
089: public void setEventBroadcaster(EventBroadcaster eventBroadcaster) {
090: _eventBroadcaster = eventBroadcaster;
091: }
092:
093: /**
094: * Initialize this plugin. This method only called when the plugin is instantiated.
095: *
096: * @throws org.blojsom.plugin.PluginException
097: * If there is an error initializing the plugin
098: */
099: public void init() throws PluginException {
100: _eventBroadcaster.addListener(this );
101: }
102:
103: /**
104: * Process the blog entries
105: *
106: * @param httpServletRequest Request
107: * @param httpServletResponse Response
108: * @param blog {@link Blog} instance
109: * @param context Context
110: * @param entries Blog entries retrieved for the particular request
111: * @return Modified set of blog entries
112: * @throws PluginException If there is an error processing the blog entries
113: */
114: public Entry[] process(HttpServletRequest httpServletRequest,
115: HttpServletResponse httpServletResponse, Blog blog,
116: Map context, Entry[] entries) throws PluginException {
117: return entries;
118: }
119:
120: /**
121: * Handle an event broadcast from another component
122: *
123: * @param event {@link Event} to be handled
124: */
125: public void handleEvent(Event event) {
126: }
127:
128: /**
129: * Process an event from another component
130: *
131: * @param event {@link Event} to be handled
132: */
133: public void processEvent(Event event) {
134: if (event instanceof ResponseSubmissionEvent) {
135: ResponseSubmissionEvent responseSubmissionEvent = (ResponseSubmissionEvent) event;
136:
137: String remoteIP = responseSubmissionEvent
138: .getHttpServletRequest().getRemoteAddr();
139: String[] ipAddress = remoteIP.split("\\.");
140: StringBuffer reversedAddress = new StringBuffer();
141: reversedAddress.append(ipAddress[3]).append(".").append(
142: ipAddress[2]).append(".").append(ipAddress[1])
143: .append(".").append(ipAddress[0]);
144:
145: try {
146: InetAddress inetAddress = InetAddress
147: .getByName(reversedAddress + ".list.dsbl.org");
148: Map metaData = responseSubmissionEvent.getMetaData();
149:
150: String deleteOpenProxySpamPropertyValue = responseSubmissionEvent
151: .getBlog()
152: .getProperty(DELETE_OPENPROXY_SPAM_IP);
153: boolean deleteOpenProxySpam = Boolean.valueOf(
154: deleteOpenProxySpamPropertyValue)
155: .booleanValue();
156:
157: if (responseSubmissionEvent instanceof CommentResponseSubmissionEvent) {
158: if (!deleteOpenProxySpam) {
159: metaData
160: .put(
161: CommentModerationPlugin.BLOJSOM_COMMENT_MODERATION_PLUGIN_APPROVED,
162: Boolean.FALSE.toString());
163: } else {
164: metaData
165: .put(
166: CommentPlugin.BLOJSOM_PLUGIN_COMMENT_METADATA_DESTROY,
167: Boolean.TRUE);
168: }
169: } else if (responseSubmissionEvent instanceof TrackbackResponseSubmissionEvent) {
170: if (!deleteOpenProxySpam) {
171: metaData
172: .put(
173: TrackbackModerationPlugin.BLOJSOM_TRACKBACK_MODERATION_PLUGIN_APPROVED,
174: Boolean.FALSE.toString());
175: } else {
176: metaData
177: .put(
178: TrackbackPlugin.BLOJSOM_PLUGIN_TRACKBACK_METADATA_DESTROY,
179: Boolean.TRUE);
180: }
181: } else if (responseSubmissionEvent instanceof PingbackResponseSubmissionEvent) {
182: if (deleteOpenProxySpam) {
183: metaData
184: .put(
185: PingbackPlugin.BLOJSOM_PLUGIN_PINGBACK_METADATA_DESTROY,
186: Boolean.TRUE);
187: }
188: }
189:
190: if (_logger.isDebugEnabled()) {
191: _logger
192: .debug("Failed open proxy check for response submission for IP: "
193: + inetAddress.getHostAddress()
194: + "/" + inetAddress.getHostName());
195: }
196: } catch (UnknownHostException e) {
197: // The IP address is unknown to the DSBL server
198: }
199: }
200: }
201:
202: /**
203: * Perform any cleanup for the plugin. Called after {@link #process}.
204: *
205: * @throws org.blojsom.plugin.PluginException
206: * If there is an error performing cleanup for this plugin
207: */
208: public void cleanup() throws PluginException {
209: }
210:
211: /**
212: * Called when BlojsomServlet is taken out of service
213: *
214: * @throws org.blojsom.plugin.PluginException
215: * If there is an error in finalizing this plugin
216: */
217: public void destroy() throws PluginException {
218: }
219: }
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