001/*
002 * (C) Copyright 2013 Nuxeo SA (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 *     dmetzler
018 */
019package org.nuxeo.ecm.automation.jaxrs.io.documents;
020
021import java.io.IOException;
022import java.io.InputStream;
023import java.lang.annotation.Annotation;
024import java.lang.reflect.Type;
025
026import javax.servlet.http.HttpServletRequest;
027import javax.ws.rs.Consumes;
028import javax.ws.rs.WebApplicationException;
029import javax.ws.rs.core.Context;
030import javax.ws.rs.core.MediaType;
031import javax.ws.rs.core.MultivaluedMap;
032import javax.ws.rs.core.Response;
033import javax.ws.rs.ext.MessageBodyReader;
034import javax.ws.rs.ext.Provider;
035
036import org.apache.commons.io.IOUtils;
037import org.codehaus.jackson.JsonFactory;
038import org.codehaus.jackson.JsonNode;
039import org.codehaus.jackson.JsonParser;
040import org.nuxeo.ecm.automation.core.operations.business.adapter.BusinessAdapter;
041import org.nuxeo.ecm.automation.io.services.codec.ObjectCodecService;
042import org.nuxeo.ecm.core.api.CoreSession;
043import org.nuxeo.ecm.webengine.jaxrs.session.SessionFactory;
044import org.nuxeo.runtime.api.Framework;
045
046/**
047 * JAX-RS Message body reeader to decode BusinessAdapter
048 *
049 * @since 5.7.2
050 */
051@Provider
052@Consumes({ "application/json+nxentity", "application/json" })
053public class BusinessAdapterReader implements MessageBodyReader<BusinessAdapter> {
054
055    @Context
056    protected HttpServletRequest request;
057
058    @Context
059    JsonFactory factory;
060
061    private CoreSession getCoreSession() {
062        return SessionFactory.getSession(request);
063    }
064
065    @Override
066    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
067        return BusinessAdapter.class.isAssignableFrom(type);
068    }
069
070    @Override
071    public BusinessAdapter readFrom(Class<BusinessAdapter> arg0, Type arg1, Annotation[] arg2, MediaType arg3,
072            MultivaluedMap<String, String> headers, InputStream in) throws IOException, WebApplicationException {
073        return readRequest(in, headers);
074    }
075
076    public BusinessAdapter readRequest(InputStream in, MultivaluedMap<String, String> headers) throws IOException,
077            WebApplicationException {
078        // As stated in http://tools.ietf.org/html/rfc4627.html UTF-8 is the
079        // default encoding for JSON content
080        // TODO: add introspection on the first bytes to detect other admissible
081        // json encodings, namely: UTF-8, UTF-16 (BE or LE), or UTF-32 (BE or LE)
082        String content = IOUtils.toString(in, "UTF-8");
083        if (content.isEmpty()) {
084            throw new WebApplicationException(Response.Status.BAD_REQUEST);
085        }
086        return readRequest(content, headers);
087    }
088
089    public BusinessAdapter readRequest(String content, MultivaluedMap<String, String> headers)
090            throws WebApplicationException {
091        try {
092            return readRequest0(content, headers);
093        } catch (WebApplicationException e) {
094            throw e;
095        } catch (IOException e) {
096            throw new WebApplicationException(e);
097        }
098    }
099
100    public BusinessAdapter readRequest0(String content, MultivaluedMap<String, String> headers) throws IOException {
101        ObjectCodecService codecService = Framework.getLocalService(ObjectCodecService.class);
102
103        JsonParser jp = factory.createJsonParser(content);
104        JsonNode inputNode = jp.readValueAsTree();
105
106        return (BusinessAdapter) codecService.readNode(inputNode, getCoreSession());
107
108    }
109
110}