    001// Licensed under the Apache License, Version 2.0 (the "License");
    002// you may not use this file except in compliance with the License.
    003// You may obtain a copy of the License at
    004//
    005// http://www.apache.org/licenses/LICENSE-2.0
    006//
    007// Unless required by applicable law or agreed to in writing, software
    008// distributed under the License is distributed on an "AS IS" BASIS,
    009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    010// See the License for the specific language governing permissions and
    011// limitations under the License.
    012
    013package org.apache.tapestry5.internal.services.assets;
    014
    015import org.apache.tapestry5.commons.Resource;
    016import org.apache.tapestry5.http.ContentType;
    017import org.apache.tapestry5.services.assets.ResourceDependencies;
    018import org.apache.tapestry5.services.assets.StreamableResource;
    019import org.apache.tapestry5.services.assets.StreamableResourceProcessing;
    020import org.apache.tapestry5.services.assets.StreamableResourceSource;
    021
    022import java.io.IOException;
    023
    024/**
    025 * Adds ;charset=utf-8 for text/* resources with no specific character set. This assumes that all test resources are
    026 * in UTF-8.
    027 *
    028 * @since 5.4
    029 */
    030public class UTF8ForTextAssets extends DelegatingSRS
    031{
    032    public UTF8ForTextAssets(StreamableResourceSource delegate)
    033    {
    034        super(delegate);
    035    }
    036
    037    @Override
    038    public StreamableResource getStreamableResource(Resource baseResource, StreamableResourceProcessing processing, ResourceDependencies dependencies) throws IOException
    039    {
    040        StreamableResource resource = delegate.getStreamableResource(baseResource, processing, dependencies);
    041
    042        ContentType contentType = resource.getContentType();
    043
    044        if (contentType.getBaseType().equals("text")
    045                && ! contentType.hasParameters()
    046                && processing != StreamableResourceProcessing.FOR_AGGREGATION)
    047        {
    048            return resource.withContentType(contentType.withCharset("utf-8"));
    049        }
    050
    051        return resource;
    052    }
    053}