nl.strohalm.cyclos.http.SanitizerFilter.java Source code

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Here is the source code for nl.strohalm.cyclos.http.SanitizerFilter.java

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/*
This file is part of Cyclos (www.cyclos.org).
A project of the Social Trade Organisation (www.socialtrade.org).
    
Cyclos 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.
    
Cyclos 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 Cyclos; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    
 */
package nl.strohalm.cyclos.http;

import java.io.IOException;
import java.util.regex.Pattern;

import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;

/**
 * Filter used to apply the correct character encoding
 * @author luis
 */
public class SanitizerFilter extends OncePerRequestFilter {

    private Pattern exclusionPattern = null;

    @Override
    public void destroy() {
    }

    @Override
    public void init(final FilterConfig config) throws ServletException {
        super.init(config);

        String excluded = config.getInitParameter("exclusionPattern");
        if (StringUtils.isNotEmpty(excluded)) {
            excluded = StringUtils.deleteWhitespace(StringUtils.replace(excluded, "\n", "|"));
            if (StringUtils.isNotEmpty(excluded)) {
                exclusionPattern = Pattern.compile(excluded);
            }
        }
    }

    @Override
    protected void execute(final HttpServletRequest request, final HttpServletResponse response,
            final FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpRequest = request;

        if (mustSanitize(httpRequest)) {
            httpRequest = new SanitizedHttpServletRequest(request);
        }

        chain.doFilter(httpRequest, response);
    }

    private boolean mustSanitize(final HttpServletRequest request) {
        return exclusionPattern != null && request.getPathInfo() != null
                && !exclusionPattern.matcher(request.getPathInfo()).matches();
    }
}