001/*
002 *  Copyright 2018 Anyware Services
003 *
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package org.ametys.core.resources;
017
018import java.io.IOException;
019import java.io.OutputStream;
020import java.util.Map;
021
022import org.apache.avalon.framework.parameters.Parameters;
023import org.apache.cocoon.ProcessingException;
024import org.apache.cocoon.components.ContextHelper;
025import org.apache.cocoon.environment.Response;
026import org.apache.commons.io.IOUtils;
027import org.apache.excalibur.source.Source;
028
029/**
030 * Default resource handler that expires 
031 */
032public class ExpiresResourceHandler extends AbstractResourceHandler
033{
034
035    @Override
036    public int getPriority()
037    {
038        return MIN_PRIORITY + 100;
039    }
040    
041    @Override
042    public Source setup(String location, Map objectModel, Parameters par, Map<String, Object> additionalParameters) throws IOException, ProcessingException
043    {
044        // This header prevents browser storage of the resource in cache
045        Response response = ContextHelper.getResponse(_context);
046        response.setDateHeader("Expires", 0);
047        
048        return super.setup(location, objectModel, par, additionalParameters);
049    }
050    
051    @Override
052    public void generateResource(Source source, OutputStream out, Map objectModel, Parameters parameters, Map<String, Object> additionalParameters) throws IOException, ProcessingException
053    {
054        IOUtils.copy(source.getInputStream(), out);
055    }
056}