001/*
002 * (C) Copyright 2018 Nuxeo (http://nuxeo.com/) and others.
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 *
016 * Contributors:
017 *     bdelbosc
018 */
019package org.nuxeo.importer.stream.consumer;
020
021import java.io.IOException;
022import java.nio.file.Files;
023import java.nio.file.Path;
024import java.nio.file.Paths;
025
026import org.apache.commons.lang3.StringUtils;
027import org.nuxeo.ecm.core.api.NuxeoException;
028import org.nuxeo.ecm.core.api.impl.blob.FileBlob;
029import org.nuxeo.importer.stream.consumer.watermarker.JpegWatermarker;
030import org.nuxeo.importer.stream.consumer.watermarker.Mp4Watermarker;
031import org.nuxeo.importer.stream.consumer.watermarker.TextWatermarker;
032import org.nuxeo.importer.stream.consumer.watermarker.Watermarker;
033import org.nuxeo.importer.stream.message.BlobMessage;
034
035/**
036 * Consume blobMessages and generate new blob by adding a unique watermark.
037 *
038 * @since 10.1
039 */
040public class BlobWatermarkMessageConsumer extends BlobMessageConsumer {
041
042    protected final String prefix;
043
044    protected final String generatedBlobPath;
045
046    protected final Path outputPath;
047
048    protected final Watermarker textWatermarker = new TextWatermarker();
049
050    protected final Watermarker jpegWatermarker = new JpegWatermarker();
051
052    protected final Watermarker mp4Watermarker = new Mp4Watermarker();
053
054    /**
055     * @param persistBlobPath when it is blank we don't delete generated blobs
056     */
057    public BlobWatermarkMessageConsumer(String consumerId, String blobProviderName, BlobInfoWriter blobInfoWriter,
058            String watermarkPrefix, String persistBlobPath) {
059        super(consumerId, blobProviderName, blobInfoWriter);
060        this.prefix = watermarkPrefix;
061        this.generatedBlobPath = persistBlobPath;
062        if (StringUtils.isBlank(persistBlobPath)) {
063            try {
064                outputPath = Files.createTempDirectory("watermark");
065            } catch (IOException e) {
066                throw new NuxeoException("Failed to create temp dir", e);
067            }
068        } else {
069            outputPath = Paths.get(persistBlobPath);
070        }
071    }
072
073    @Override
074    protected CloseableBlob getBlob(BlobMessage message) {
075        String watermark = getWatermarkString();
076        switch (message.getMimeType()) {
077        case "text/plain":
078            return addWatermark(message, watermark, textWatermarker);
079        case "image/jpeg":
080            return addWatermark(message, watermark, jpegWatermarker);
081        case "video/mp4":
082            return addWatermark(message, watermark, mp4Watermarker);
083        default:
084            return super.getBlob(message);
085        }
086    }
087
088    protected CloseableBlob addWatermark(BlobMessage message, String watermark, Watermarker watermarker) {
089        Path output = watermarker.addWatermark(Paths.get(message.getPath()), outputPath, watermark);
090        Path fileToDelete = StringUtils.isBlank(generatedBlobPath) ? output : null;
091        return new CloseableBlob(new FileBlob(output.toFile(), message.getMimeType()), fileToDelete);
092    }
093
094    protected String getWatermarkString() {
095        return prefix + " " + System.currentTimeMillis();
096    }
097}