    001    // Copyright 2010 The Apache Software Foundation
    002    //
    003    // Licensed under the Apache License, Version 2.0 (the "License");
    004    // you may not use this file except in compliance with the License.
    005    // You may obtain a copy of the License at
    006    //
    007    // http://www.apache.org/licenses/LICENSE-2.0
    008    //
    009    // Unless required by applicable law or agreed to in writing, software
    010    // distributed under the License is distributed on an "AS IS" BASIS,
    011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012    // See the License for the specific language governing permissions and
    013    // limitations under the License.
    014
    015    package org.apache.tapestry5.internal.services.assets;
    016
    017    import java.io.IOException;
    018    import java.util.regex.Pattern;
    019
    020    import org.apache.tapestry5.internal.services.ResourceStreamer;
    021    import org.apache.tapestry5.ioc.Resource;
    022    import org.apache.tapestry5.services.Request;
    023    import org.apache.tapestry5.services.Response;
    024    import org.apache.tapestry5.services.assets.AssetRequestHandler;
    025
    026    /**
    027     * Handles requests for context assets, screening out attempt to
    028     * access anything under WEB-INF or META-INF.
    029     *
    030     * @since 5.2.0
    031     */
    032    public class ContextAssetRequestHandler implements AssetRequestHandler
    033    {
    034        private final ResourceStreamer resourceStreamer;
    035
    036        private final Resource rootContextResource;
    037
    038        private final Pattern illegal = Pattern.compile("^(((web|meta)-inf.*)|(.*\\.tml$))", Pattern.CASE_INSENSITIVE);
    039
    040        public ContextAssetRequestHandler(ResourceStreamer resourceStreamer, Resource rootContextResource)
    041        {
    042            this.resourceStreamer = resourceStreamer;
    043            this.rootContextResource = rootContextResource;
    044        }
    045
    046        public boolean handleAssetRequest(Request request, Response response, String extraPath) throws IOException
    047        {
    048            if (illegal.matcher(extraPath).matches())
    049                return false;
    050
    051            Resource resource = rootContextResource.forFile(extraPath);
    052
    053            resourceStreamer.streamResource(resource);
    054
    055            return true;
    056        }
    057
    058    }