Package org.jasen.plugins

Source Code of org.jasen.plugins.ObfuscatedCharacterScanner

/*
* @(#)ObfuscatedCharacterScanner.java  4/01/2005
*
* 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.plugins;

import java.util.Properties;

import javax.mail.internet.MimeMessage;

import org.jasen.core.PointTestResult;
import org.jasen.core.StandardParserData;
import org.jasen.core.engine.Jasen;
import org.jasen.error.JasenException;
import org.jasen.interfaces.JasenMessage;
import org.jasen.interfaces.JasenPlugin;
import org.jasen.interfaces.JasenTestResult;
import org.jasen.interfaces.ParserData;
import org.jasen.interfaces.ReceivedHeaderParser;

/**
* <p>
* This plugin looks at the parser data returned from a parse for occurrences of
* anomalous character replacments.
* </p>
* <p>
* Many spam messages will use non-ASCII characters which "look" similar to the standard ASCII version.<br/>
* For example: The letter 'I' will often be replaced with the pipe symbol '|'
* </p>
* <p>
* jASEN will detect this and use an appropriate replacement, however it will also record this character misuse
* </p>
* @author Jason Polites
*/
public class ObfuscatedCharacterScanner implements JasenPlugin {

    private float max = 0.9f;
    private float min = 0.5f;
    private int threshold = 10;

    /**
     *
     */
    public ObfuscatedCharacterScanner() {
        super();
    }

    /* (non-Javadoc)
     * @see org.jasen.interfaces.JasenPlugin#init(java.util.Properties)
     */
    public void init(Properties properties) throws JasenException {
        if(properties != null) {
            String strMin = properties.getProperty("min");
            String strMax = properties.getProperty("max");
            String strThresh = properties.getProperty("threshold");

            if(strMin != null) {
                min = Float.parseFloat(strMin);
            }

            if(strMax != null) {
                max = Float.parseFloat(strMax);
            }

            if(strThresh != null) {
                threshold = Integer.parseInt(strThresh);
            }
        }
    }

    /*
     * (non-Javadoc)
     * @see org.jasen.interfaces.JasenPlugin#destroy()
     */
    public void destroy() throws JasenException {}

    /* (non-Javadoc)
     * @see org.jasen.interfaces.JasenPlugin#test(org.jasen.core.Jasen, javax.mail.internet.MimeMessage, org.jasen.interfaces.JasenMessage, org.jasen.interfaces.ParserData, org.jasen.interfaces.ReceivedHeaderParser)
     */
    public JasenTestResult test(Jasen engine, MimeMessage rawMessage,
            JasenMessage parsedMessage, ParserData data,
            ReceivedHeaderParser parser) throws JasenException {
        // Get the obfuscation count
        PointTestResult result = new PointTestResult();
        result.setMin(min);
        result.setMax(max);
        result.setThreshold(threshold);

        if(data instanceof StandardParserData) {
            result.setPoints(((StandardParserData)data).getObfuscatedCharacterCount());
        }

        return result;
    }
}
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