001/*
002 * (C) Copyright 2002-2012 Nuxeo SAS (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     Nuxeo - initial API and implementation
016 *
017 */
018
019package org.nuxeo.ecm.platform.convert.plugins;
020
021import java.io.IOException;
022import java.io.InputStream;
023import java.io.Serializable;
024import java.util.Arrays;
025import java.util.List;
026import java.util.Map;
027
028import org.nuxeo.common.utils.ZipUtils;
029import org.nuxeo.ecm.core.api.Blob;
030import org.nuxeo.ecm.core.api.Blobs;
031import org.nuxeo.ecm.core.api.blobholder.BlobHolder;
032import org.nuxeo.ecm.core.convert.api.ConversionException;
033import org.nuxeo.ecm.core.convert.cache.SimpleCachableBlobHolder;
034import org.nuxeo.ecm.core.convert.extension.Converter;
035import org.nuxeo.ecm.core.convert.extension.ConverterDescriptor;
036
037/**
038 * iWork2PDF converter.
039 *
040 * @author ldoguin
041 */
042public class IWork2PDFConverter implements Converter {
043
044    public static final List<String> IWORK_MIME_TYPES = Arrays.asList(new String[] { "application/vnd.apple.pages",
045            "application/vnd.apple.keynote", "application/vnd.apple.numbers", "application/vnd.apple.iwork" });
046
047    private static final String IWORK_PREVIEW_FILE = "QuickLook/Preview.pdf";
048
049    @Override
050    public BlobHolder convert(BlobHolder blobHolder, Map<String, Serializable> parameters) throws ConversionException {
051        try {
052            // retrieve the blob and verify its mimeType
053            Blob blob = blobHolder.getBlob();
054            String mimeType = blob.getMimeType();
055
056            if (mimeType == null || !IWORK_MIME_TYPES.contains(mimeType)) {
057                throw new ConversionException("not an iWork file");
058            }
059            // look for the pdf file
060            if (ZipUtils.hasEntry(blob.getStream(), IWORK_PREVIEW_FILE)) {
061                // pdf file exist, let's extract it and return it as a
062                // BlobHolder.
063                Blob previewBlob;
064                try (InputStream previewPDFFile = ZipUtils.getEntryContentAsStream(blob.getStream(), IWORK_PREVIEW_FILE)) {
065                    previewBlob = Blobs.createBlob(previewPDFFile);
066                }
067                return new SimpleCachableBlobHolder(previewBlob);
068            } else {
069                // Pdf file does not exist, conversion cannot be done.
070                throw new ConversionException("iWork file does not contain a pdf preview.");
071            }
072        } catch (IOException e) {
073            throw new ConversionException("Could not find the pdf preview in the iWork file", e);
074        }
075    }
076
077    @Override
078    public void init(ConverterDescriptor descriptor) {
079    }
080
081}