edu.uga.cs.fluxbuster.utils.DomainNameUtils.java Source code

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Here is the source code for edu.uga.cs.fluxbuster.utils.DomainNameUtils.java

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/*
* Copyright (C) 2012 Chris Neasbitt
* Author: Chris Neasbitt
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package edu.uga.cs.fluxbuster.utils;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.google.common.net.InternetDomainName;

/**
 * This class provides utilities for manipulating domain names.
 * 
 * @author Chris Neasbitt
 */
public class DomainNameUtils {

    private static Log log = LogFactory.getLog(DomainNameUtils.class);

    /**
     * Extracts the effective second level domain name.
     *
     * @param domainname the full domain name
     * @return the second level domain name or null on error
     */
    public static String extractEffective2LD(String domainname) {
        String retval = null;
        try {
            InternetDomainName idn = InternetDomainName.from(domainname);
            InternetDomainName sld = idn.topPrivateDomain();
            retval = sld.name();
        } catch (Exception e) {
            if (log.isDebugEnabled()) {
                log.debug("Unable to extract 2LD.", e);
            }
        }
        return retval;
    }

    /**
     * Returns a copy of the domain name with leading and trailing
     * dots removed.
     * 
     * @param domainname the original domain name
     * @return the stripped of dots
     */
    public static String stripDots(String domainname) {
        String retval = domainname;
        if (retval.endsWith(".")) {
            retval = retval.substring(0, retval.length() - 1);
        }
        if (retval.startsWith(".")) {
            retval = retval.substring(1, retval.length());
        }
        return retval;
    }

    /**
     * Reverses a domain name.
     *
     * @param domainName the domain name
     * @return the domain name reversed at the periods
     */
    public static String reverseDomainName(String domainName) {
        String reverse = "";

        String[] domainParts = domainName.split("\\.");

        for (int i = domainParts.length - 1; i >= 0; i--) {
            reverse += domainParts[i];
            if (i != 0)
                reverse += ".";
        }

        return reverse;
    }
}