/*
    * Copyright 2014 The Apache Software Foundation.
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.juddi.webconsole;
  
  import java.io.IOException;
  import java.text.SimpleDateFormat;
  import java.util.Calendar;
  import java.util.GregorianCalendar;
  import javax.servlet.Filter;
  import javax.servlet.FilterChain;
  import javax.servlet.FilterConfig;
  import javax.servlet.ServletException;
  import javax.servlet.ServletRequest;
  import javax.servlet.ServletResponse;
  import javax.servlet.http.HttpServletResponse;
  
  /**
   *
   * @author Alex O'Ree
   */
  public class YesCacheFilter implements Filter {
          
          @Override
          public void init(FilterConfig fc) throws ServletException {
                  
          }
          
          @Override
          public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
                  HttpServletResponse hsr = (HttpServletResponse) res;
                  hsr.setHeader("Cache-Control", "public, max-age=86400"); // HTTP 1.1.
                  Calendar c = new GregorianCalendar();
                  c.add(Calendar.MONTH, -1);
                  SimpleDateFormat sdf = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z");
                  
                  hsr.setHeader("Last-Modified", sdf.format(c.getTime())); // HTTP 1.0.
                  hsr.setDateHeader("Expires", System.currentTimeMillis() + (30 * 24 * 60 * 60 * 1000)); // 1 month.
                  chain.doFilter(req, res);
                  
          }
          
          @Override
          public void destroy() {
                  
          }
          
  }