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 *     Funsho David
018 */
019
020package org.nuxeo.ecm.automation.core.util;
021
022import java.io.IOException;
023
024import javax.servlet.http.HttpServletResponse;
025
026import org.nuxeo.ecm.core.api.Blob;
027import org.nuxeo.ecm.core.api.NuxeoException;
028import org.nuxeo.ecm.core.blob.BlobInfo;
029import org.nuxeo.ecm.core.blob.BlobManager;
030import org.nuxeo.ecm.core.blob.BlobProvider;
031import org.nuxeo.runtime.api.Framework;
032
033import com.fasterxml.jackson.databind.node.ObjectNode;
034
035/**
036 * Blob decoder resolving a blob from a given blob provider and a blob key.
037 * <p>
038 * Format is:
039 *
040 * <pre>
041 * {
042 *     "providerId": "PROVIDER_ID", &lt;-- the blob provider id
043 *     "key": "BLOB_KEY" &lt;-- the blob key
044 * }
045 * </pre>
046 *
047 * @since 10.2
048 */
049public class JSONManagedBlobDecoder implements JSONBlobDecoder {
050
051    @Override
052    public Blob getBlobFromJSON(ObjectNode jsonObject) {
053
054        if (!(jsonObject.has("providerId") && jsonObject.has("key"))) {
055            return null;
056        }
057
058        String providerId = jsonObject.get("providerId").textValue();
059        BlobProvider blobProvider = Framework.getService(BlobManager.class).getBlobProvider(providerId);
060        if (blobProvider == null) {
061            return null;
062        }
063
064        if (!blobProvider.hasCreateFromKeyPermission()) {
065            throw new NuxeoException("The current user does not have the rights to fetch the blob",
066                    HttpServletResponse.SC_UNAUTHORIZED);
067        }
068
069        try {
070            BlobInfo blobInfo = new BlobInfo();
071            blobInfo.key = providerId + ":" + jsonObject.get("key").textValue();
072            return blobProvider.readBlob(blobInfo);
073        } catch (IOException e) {
074            throw new NuxeoException(e);
075        }
076    }
077
078}