| /*- |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.sling.dynamicinclude; |
| |
| import java.io.IOException; |
| |
| 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 org.apache.felix.scr.annotations.Reference; |
| import org.apache.felix.scr.annotations.sling.SlingFilter; |
| import org.apache.felix.scr.annotations.sling.SlingFilterScope; |
| import org.apache.sling.api.SlingHttpServletRequest; |
| import org.apache.sling.api.SlingHttpServletResponse; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @SlingFilter(scope = {SlingFilterScope.REQUEST, SlingFilterScope.FORWARD}, order = 0) |
| public class CacheControlFilter implements Filter { |
| |
| private static final String HEADER_DATE = "Date"; |
| |
| private static final String HEADER_CACHE_CONTROL = "Cache-Control"; |
| |
| private static final Logger LOG = LoggerFactory.getLogger(CacheControlFilter.class); |
| |
| @Reference |
| private ConfigurationWhiteboard configurationWhiteboard; |
| |
| @Override |
| public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, |
| ServletException { |
| final SlingHttpServletRequest slingRequest = (SlingHttpServletRequest) request; |
| final String resourceType = slingRequest.getResource().getResourceType(); |
| final Configuration config = configurationWhiteboard.getConfiguration(slingRequest, resourceType); |
| |
| if (config != null && config.hasTtlSet()) { |
| SlingHttpServletResponse slingResponse = (SlingHttpServletResponse) response; |
| slingResponse.setHeader(HEADER_CACHE_CONTROL, "max-age=" + config.getTtl()); |
| LOG.debug("set \"{}: max-age={}\" to {}", HEADER_CACHE_CONTROL, config.getTtl(), resourceType); |
| if (!slingResponse.containsHeader(HEADER_DATE)) { |
| slingResponse.setDateHeader(HEADER_DATE, System.currentTimeMillis()); |
| } |
| } |
| |
| chain.doFilter(request, response); |
| } |
| |
| @Override |
| public void init(FilterConfig filterConfig) throws ServletException { |
| } |
| |
| @Override |
| public void destroy() { |
| } |
| } |