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.util.Map;
020
021import org.apache.avalon.framework.context.Context;
022import org.apache.avalon.framework.context.ContextException;
023import org.apache.avalon.framework.context.Contextualizable;
024import org.apache.avalon.framework.parameters.Parameters;
025import org.apache.cocoon.ProcessingException;
026import org.apache.cocoon.components.ContextHelper;
027import org.apache.cocoon.environment.Response;
028import org.apache.excalibur.source.Source;
029
030/**
031 * Default resource handler that expires 
032 */
033public class ExpiresResourceHandler extends SimpleResourceHandler implements Contextualizable
034{
035    private Context _context;
036    
037    /**
038     * Default constructor
039     */
040    public ExpiresResourceHandler()
041    {
042        super();
043    }
044    
045    /**
046     * Constructor with an already resolved {@link Source}.
047     * @param source the source
048     */
049    public ExpiresResourceHandler(Source source)
050    {
051        super(source);
052    }
053    
054    public void contextualize(Context context) throws ContextException
055    {
056        _context = context;
057    }
058    
059    @Override
060    public Source setup(String location, Map objectModel, Parameters parameters, boolean readForDownload) throws IOException, ProcessingException
061    {
062        // This header prevents browser storage of the resource in cache
063        Response response = ContextHelper.getResponse(_context);
064        response.setDateHeader("Expires", 0);
065        
066        return super.setup(location, objectModel, parameters, readForDownload);
067    }
068}