/*
* Copyright (c) 2003-2011, Simon Brown
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* - Neither the name of Pebble nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package net.sourceforge.pebble.event.response;
import net.sourceforge.pebble.PluginProperties;
import net.sourceforge.pebble.domain.Comment;
import net.sourceforge.pebble.domain.Response;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Checks comment and TrackBack content for a large number of links and sets
* the state of such responses to pending.
*
* @author Simon Brown
*/
public class LinkSpamListener extends BlogEntryResponseListenerSupport {
/** the log used by this class */
private static final Log log = LogFactory.getLog(LinkSpamListener.class);
/** the pattern used to find HTML links */
private static final Pattern HTML_LINK_PATTERN = Pattern.compile("<a.*?href=.*?>", Pattern.CASE_INSENSITIVE | Pattern.DOTALL);
/** the default threshold for the number of links allowed */
public static final int DEFAULT_THRESHOLD = 3;
/** the name of the threshold property for comments */
public static final String COMMENT_THRESHOLD_KEY = "LinkSpamListener.commentThreshold";
/** the name of the threshold property for TrackBacks */
public static final String TRACKBACK_THRESHOLD_KEY = "LinkSpamListener.trackbackThreshold";
/**
* Called when a comment or TrackBack has been added.
*
* @param response a Response
*/
protected void blogEntryResponseAdded(Response response) {
String content = response.getContent();
if (content != null) {
Matcher m = HTML_LINK_PATTERN.matcher(content);
int count = 0;
while (m.find()) {
count++;
}
PluginProperties props = response.getBlogEntry().getBlog().getPluginProperties();
String propertyName = "";
if (response instanceof Comment) {
propertyName = COMMENT_THRESHOLD_KEY;
} else {
propertyName = TRACKBACK_THRESHOLD_KEY;
}
int threshold = DEFAULT_THRESHOLD;
if (props.hasProperty(propertyName)) {
try {
threshold = Integer.parseInt(props.getProperty(propertyName));
} catch (NumberFormatException nfe) {
log.error(nfe.getMessage());
// do nothing, the value has already been defaulted
}
}
if (count > threshold) {
log.info(response.getTitle() + " marked as pending : number of links is " + count + ", threshold is " + threshold);
response.setPending();
response.incrementSpamScore();
}
}
}
}