standardheuristicanalyzer.java

来自「spam source codejasen-0.9jASEN - java An」· Java 代码 · 共 114 行

/*
 * @(#)StandardHeuristicAnalyzer.java	1/12/2004
 *
 * Copyright (c) 2004, 2005  jASEN.org
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *
 *   2. 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.
 *
 *   3. The names of the authors may not be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 *   4. Any modification or additions to the software must be contributed back
 *      to the project.
 *
 *   5. Any investigation or reverse engineering of source code or binary to
 *      enable emails to bypass the filters, and hence inflict spam and or viruses
 *      onto users who use or do not use jASEN could subject the perpetrator to
 *      criminal and or civil liability.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED 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 JASEN.ORG,
 * OR ANY CONTRIBUTORS TO THIS SOFTWARE 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 org.jasen.core.parsers;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

import org.jasen.error.ErrorHandlerBroker;
import org.jasen.error.JasenException;
import org.jasen.interfaces.HeuristicAnalyzer;
import org.jasen.interfaces.HeuristicDefinitionSet;
import org.jasen.interfaces.JasenMessage;

/**
 * <P>
 * 	Scans a message looking for regular expression matches.
 * </P>
 * @author Jason Polites
 */
public class StandardHeuristicAnalyzer implements HeuristicAnalyzer
{
    /**
     * 
     */
    public StandardHeuristicAnalyzer() {
        super ();
    }

    /* (non-Javadoc)
     * @see org.jasen.interfaces.HeuristicAnalyzer#analyze(org.jasen.interfaces.JasenMessage)
     */
    public int analyze(MimeMessage mm, JasenMessage message, HeuristicDefinitionSet definitions, int threshold) throws JasenException {
        StandardHeuristicDefinitionSet set = (StandardHeuristicDefinitionSet)definitions;
        
        String[] defs = set.getDefinitions();
        Pattern p;
        Matcher m;
        
        StringBuffer buffer = new StringBuffer();
        buffer.append(message.getHtmlPart());
        buffer.append(" ");
        buffer.append(message.getTextPart());
        buffer.append(" ");
        
        int match = 0;
        
        try
        {
            buffer.append(mm.getSubject());
        }
        catch (MessagingException ignore)
        {
            ErrorHandlerBroker.getInstance().getErrorHandler().handleException(ignore);
        }        
        
        String data = buffer.toString();

        for (int i = 0; i < defs.length; i++)
        {
            p = Pattern.compile(defs[i], Pattern.CASE_INSENSITIVE);
            m = p.matcher(data);
            if(m.find()) {
                match++;
                if(threshold > 0 && match >= threshold) {
                    break;
                }
            }
        }
        
        return match;
    }

}