/**
* Copyright (C) 2009 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.web.filter;
import java.io.IOException;
import java.util.regex.Pattern;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.exoplatform.container.ExoContainer;
import org.exoplatform.container.web.AbstractFilter;
/**
* This filter allows the rest of the platform to add their own filters without changing the web.xml file. It is based on
* {@link ExtensibleFilter} which is a component that supports plugin.
*
* Created by The eXo Platform SAS Author : Nicolas Filotto nicolas.filotto@exoplatform.com 25 sept. 2009
*/
public class GenericFilter extends AbstractFilter {
private Pattern contextPathPattern;
/**
* @see javax.servlet.Filter#destroy()
*/
public void destroy() {
}
@Override
protected void afterInit(FilterConfig config) throws ServletException {
ServletContext servletContext = this.getServletContext();
contextPathPattern = Pattern.compile("[/]*" + servletContext.getContextPath() + "[/]*");
}
/**
* This filter calls <code>doFilter</code> of the {@link ExtensibleFilter} of the current eXo container if it cans be found
* otherwise it releases filter
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
ServletException {
ExoContainer container = getContainer();
ExtensibleFilter filter = (ExtensibleFilter) container.getComponentInstanceOfType(ExtensibleFilter.class);
if (filter == null) {
chain.doFilter(request, response);
} else {
String path = contextPathPattern.matcher(((HttpServletRequest) request).getRequestURI()).replaceFirst("/");
filter.doFilter(request, response, chain, path);
}
}
}