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.parameters.Parameters;
022import org.apache.cocoon.ProcessingException;
023import org.apache.cocoon.components.ContextHelper;
024import org.apache.cocoon.environment.Response;
025import org.apache.excalibur.source.Source;
026
027/**
028 * Resource handler for JavaScript files
029 */
030public class JSResourceHandler extends I18nTextResourceHandler
031{
032    /** Parameter to enable or not the expire 0 header. Default to true */
033    protected static final String __PARAMETER_SET_EXPIRES_HEADER_TO_NO_CACHE = "parameter-enable-expire-header";
034
035    @Override
036    public Source setup(String location, Map objectModel, Parameters par, Map<String, Object> additionalParameters) throws ProcessingException, IOException
037    {
038        // RUNTIME-2898 : In chrome, the cache validity of javascript files loaded by Source Maps 
039        // is not properly checked with the server. No request is performed. To fix this issue, 
040        // non-minimized JS files should have an expire header of 0, so they are not stored in the browser cache.
041        if ("true".equals(additionalParameters.getOrDefault(__PARAMETER_SET_EXPIRES_HEADER_TO_NO_CACHE, "true")))
042        {
043            Response response = ContextHelper.getResponse(_context);
044            response.setDateHeader("Expires", 0);
045        }
046        return super.setup(location, objectModel, par, additionalParameters);
047    }
048    
049    @Override
050    public String getMimeType(Source source, Parameters par)
051    {
052        return "text/javascript;charset=utf-8";
053    }
054}