RegExpUtilities.java

/*
 * GovWay - A customizable API Gateway 
 * https://govway.org
 * 
 * Copyright (c) 2005-2025 Link.it srl (https://link.it). 
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3, as published by
 * the Free Software Foundation.
 *
 * 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 org.openspcoop2.utils.regexp;

import java.io.File;

import org.openspcoop2.utils.UtilsException;

/** 
 * Contiene utilities
 *
 * @author Poli Andrea (apoli@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */

public class RegExpUtilities {

    /* VALIDAZIONI */
    
    private static final String oneAlpha = "(.)*((\\p{Alpha})|[-])(.)*";
    private static final String domainIdentifier = "((\\p{Alnum})([-]|(\\p{Alnum}))*(\\p{Alnum}))|(\\p{Alnum})";
    private static final String domainNameRule = "(" + RegExpUtilities.domainIdentifier + ")((\\.)(" + RegExpUtilities.domainIdentifier + "))*";
    
    public static boolean isDefinedByVariable(String value) throws java.net.MalformedURLException{
        boolean definedByVariable = value!=null && value.contains("${") && value.contains("}");
        return definedByVariable;
    }
    
    public static boolean isUrlDefinedByVariable(String url) throws java.net.MalformedURLException{
        return isDefinedByVariable(url);
    }
    public static void validateUrl(String url) throws java.net.MalformedURLException{
        validateUrl(url, false);
    }
    public static void validateUrl(String url, boolean skipCheckUrlDefinedByVariable) throws java.net.MalformedURLException{
        boolean urlDefinedByVariable = isUrlDefinedByVariable(url);
        if( (!urlDefinedByVariable) || (!skipCheckUrlDefinedByVariable) ) {
            // se sono presenti le { } la url può essere costruita dinamicamente
            java.net.URL testUrl = new java.net.URL(url);
            testUrl.toString();
        }
    }
    
    public static void validateUri(String uri) throws UtilsException,java.net.MalformedURLException{
        validateUri(uri, false);
    }
    public static void validateUri(String uri, boolean skipCheckUrlDefinedByVariable) throws UtilsException,java.net.MalformedURLException{
        if (uri.startsWith("http://")
                || uri.startsWith("file://")) {

            RegExpUtilities.validateUrl(uri);

        } else {
            File f = new File(uri);
            f.getAbsolutePath();
        }
    }
    
    public static boolean validateDomainName(String domainName) {
        if ((domainName == null) || (domainName.length() > 63)) {
            return false;
        }
        return domainName.matches(RegExpUtilities.domainNameRule) && domainName.matches(RegExpUtilities.oneAlpha);
    }

    public static boolean isIPOrHostname(String stringToCheck) {
        boolean ok = true;

        try {
            if (! RegularExpressionEngine.isMatch(stringToCheck, "^[0-9]+.[0-9]+.[0-9]+.[0-9]+$") &&
                    !RegExpUtilities.validateDomainName(stringToCheck))
                ok = false;
        } catch (Exception e) {
            java.util.Date now = new java.util.Date();
            System.err.println(now + " Exception " + e.getMessage());
        }

        return ok;
    }
    
}