| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.sling.cms.transformer.internal; |
| |
| import java.awt.image.BufferedImage; |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Optional; |
| |
| import javax.imageio.ImageIO; |
| |
| import org.apache.jackrabbit.JcrConstants; |
| import org.apache.pdfbox.pdmodel.PDDocument; |
| import org.apache.pdfbox.rendering.ImageType; |
| import org.apache.pdfbox.rendering.PDFRenderer; |
| import org.apache.sling.api.resource.Resource; |
| import org.apache.sling.cms.CMSConstants; |
| import org.apache.sling.cms.File; |
| import org.apache.sling.cms.transformer.ThumbnailProvider; |
| import org.osgi.service.component.annotations.Component; |
| |
| import com.google.common.net.MediaType; |
| |
| /** |
| * A thumbnail provider for PDF documents. |
| */ |
| @Component(service = ThumbnailProvider.class, immediate = true) |
| public class PdfThumbnailProvider implements ThumbnailProvider { |
| |
| @Override |
| public boolean applies(Resource resource) { |
| return (CMSConstants.NT_FILE.equals(resource.getResourceType()) |
| || JcrConstants.NT_FILE.equals(resource.getResourceType())) |
| && Optional.ofNullable(resource.adaptTo(File.class)) |
| .map(r -> MediaType.PDF.is(MediaType.parse(r.getContentType()))).orElse(false); |
| } |
| |
| @Override |
| public InputStream getThumbnail(Resource resource) throws IOException { |
| try (PDDocument document = PDDocument.load(resource.adaptTo(InputStream.class))) { |
| PDFRenderer pdfRenderer = new PDFRenderer(document); |
| BufferedImage bim = pdfRenderer.renderImageWithDPI(0, 300, ImageType.RGB); |
| ByteArrayOutputStream os = new ByteArrayOutputStream(); |
| ImageIO.write(bim, "jpeg", os); |
| return new ByteArrayInputStream(os.toByteArray()); |
| } |
| } |
| } |