com.versatus.jwebshield.UrlPatternMatcher.java Source code

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Here is the source code for com.versatus.jwebshield.UrlPatternMatcher.java

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/*
 * This file is part of J-WebShield framework.
    
J-WebShield framework 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.
    
J-WebShield framework 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 J-WebShield framework.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.versatus.jwebshield;

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

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Matches a pattern in a request URL. Pattern syntax attempts to follow Java
 * servlet specification. Examples: *.htm - matches extension, /servlet/* -
 * matches path, test.htm - matches a page
 * 
 * @author Versatus Corp.
 * 
 */
public class UrlPatternMatcher {

    private final Logger logger = LoggerFactory.getLogger(UrlPatternMatcher.class);

    /**
     * Match a URL against a pattern.
     * 
     * @param url
     *            String
     * @param pattern
     *            String
     * @return boolean
     * @throws Exception
     */
    public boolean matches(String url, String pattern) throws Exception {

        boolean result = false;

        logger.debug("matches: input - url=" + url + " | pattern=" + pattern);

        if (pattern == null || url == null) {
            throw new Exception("Input parameter(s) are blank!");
        }

        Pattern p;
        if (pattern.contains("*")) {
            p = Pattern.compile(pattern.replace("*", "").replace("/", "\\/") + "$");

        } else if (pattern.equalsIgnoreCase("/")) {
            p = Pattern.compile(pattern.replace("/", "\\/"));
        } else {
            p = Pattern.compile(pattern.replace(".", "\\.").replace("/", "\\/") + "$");
        }

        Matcher matcher = p.matcher(url);

        logger.debug("matches: Original pattern=" + pattern + " | regex=" + p.pattern());

        while (matcher.find()) {
            result = true;
            logger.debug("matches: group=" + matcher.group());
        }
        logger.debug("Matching " + pattern + " against " + url + " | result=" + result);

        return result;

    }

}