/*

  * Copyright (c) 2003-2011, Simon Brown

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions are met:

  *

  *   - Redistributions of source code must retain the above copyright

  *     notice, this list of conditions and the following disclaimer.

  *

  *   - Redistributions in binary form must reproduce the above copyright

  *     notice, this list of conditions and the following disclaimer in

  *     the documentation and/or other materials provided with the

  *     distribution.

  *

  *   - Neither the name of Pebble nor the names of its contributors may

  *     be used to endorse or promote products derived from this software

  *     without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

  * POSSIBILITY OF SUCH DAMAGE.

  */

 package net.sourceforge.pebble.web.filter;

 import net.sourceforge.pebble.Constants;

 import net.sourceforge.pebble.domain.AbstractBlog;

 import javax.servlet.*;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import java.io.IOException;

 public class GZIPFilter implements Filter {

   public void doFilter(ServletRequest req, ServletResponse res,

                        FilterChain chain) throws IOException, ServletException {

       HttpServletRequest request = (HttpServletRequest) req;

       HttpServletResponse response = (HttpServletResponse) res;

       String ae = request.getHeader("Accept-Encoding");

       if (ae != null && ae.indexOf("gzip") != -1) {

         String encoding = ((AbstractBlog)request.getAttribute(Constants.BLOG_KEY)).getCharacterEncoding();

         GZIPResponseWrapper wrappedResponse = new GZIPResponseWrapper(response, encoding);

         chain.doFilter(req, wrappedResponse);

         wrappedResponse.finishResponse();

       } else {

         chain.doFilter(req, res);

       }

   }

   public void init(FilterConfig filterConfig) {

   }

   public void destroy() {

   }

 }