nl.sidn.dnslib.util.NameUtil.java Source code

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Here is the source code for nl.sidn.dnslib.util.NameUtil.java

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/*
 * ENTRADA, a big data platform for network data analytics
 *
 * Copyright (C) 2016 SIDN [https://www.sidn.nl]
 * 
 * This file is part of ENTRADA.
 * 
 * ENTRADA 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 3 of the License, or
 * (at your option) any later version.
 * 
 * ENTRADA 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 ENTRADA.  If not, see [<http://www.gnu.org/licenses/].
 *
 */
package nl.sidn.dnslib.util;

import java.util.List;
import java.util.regex.Pattern;

import org.apache.commons.lang3.StringUtils;

public class NameUtil {

    private static Pattern FQDN;
    private static final String DOMAIN_NAME_PATTERN = "^((?!-)[A-Za-z0-9-_]{1,63}(?<!-)\\.)*([A-Za-z]{2,2})*(\\.)*$";

    static {
        FQDN = Pattern.compile(DOMAIN_NAME_PATTERN);
    }

    public static String reverse(String name) {
        String[] parts = StringUtils.split(name, '.');
        if (parts.length > 0) {
            String reverse = "";
            for (int i = parts.length - 1; i >= 0; i--) {
                reverse = reverse + "." + parts[i];
            }
            return reverse;
        }
        return null;
    }

    public static Domaininfo getDomain(String name) {
        if (name == null || name.length() == 0) {
            return new Domaininfo(null, 0);
        }
        if (StringUtils.equals(name, ".")) {
            return new Domaininfo(name, 0);
        }

        String[] parts = StringUtils.split(name, ".");

        if (parts != null && parts.length > 0) {
            if (parts.length == 1) {
                //only 1 label present
                return new Domaininfo(parts[0], 1);
            }
            //all others have more than 1 label, get last 2
            return new Domaininfo(parts[parts.length - 2] + "." + parts[parts.length - 1], parts.length);
        }

        return new Domaininfo(name, 0);

    }

    public static Domaininfo getDomain(String name, List<DomainParent> parents) {
        //check if tld suffixes are loaded, if so use these
        if (parents != null && parents.size() > 0) {
            return getDomainWithSuffixList(name, parents);
        }
        //no suffixes use, simple old method of assuming tld is 1st level
        return getDomain(name);
    }

    public static Domaininfo getDomainWithSuffixList(String name, List<DomainParent> parents) {
        if (name == null || name.length() == 0) {
            return new Domaininfo(null, 0);
        }
        if (StringUtils.equals(name, ".")) {
            return new Domaininfo(name, 0);
        }

        String[] parts = StringUtils.split(name, ".");

        if (parts != null && parts.length > 0) {
            if (parts.length == 1) {
                //only 1 label present
                return new Domaininfo(parts[0], 1);
            }
            //try to find a matching tld suffix
            for (DomainParent parent : parents) {
                if (StringUtils.endsWith(name, parent.getMatch())) {
                    //get the label before the tld which is the registred name.
                    return new Domaininfo(parts[parts.length - (parent.getLabels() + 1)] + parent.getParent(),
                            parts.length);
                }
            }

            //unknown tld, assume 2nd level tld
            return new Domaininfo(parts[parts.length - 2] + "." + parts[parts.length - 1], parts.length);
        }

        return new Domaininfo(name, 0);
    }

    public static boolean isFqdn(String domain) {
        return FQDN.matcher(domain).find();
    }

    public static String getSecondLevel(String name) {
        if (name == null || name.length() == 0) {
            return null;
        }

        String[] parts = StringUtils.split(name, '.');
        if (parts.length == 0) {
            return name;
        } else if (parts.length == 1) {
            return parts[parts.length - 1];
        } else {
            return parts[parts.length - 2] + "." + parts[parts.length - 1];
        }

    }

}