org.activiti.rest.service.api.runtime.task.TaskAttachmentCollectionResource.java Source code

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Here is the source code for org.activiti.rest.service.api.runtime.task.TaskAttachmentCollectionResource.java

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/* Licensed 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.activiti.rest.service.api.runtime.task;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.history.HistoricTaskInstance;
import org.activiti.engine.task.Attachment;
import org.activiti.engine.task.Task;
import org.activiti.rest.common.api.ActivitiUtil;
import org.activiti.rest.service.api.RestResponseFactory;
import org.activiti.rest.service.api.engine.AttachmentRequest;
import org.activiti.rest.service.api.engine.AttachmentResponse;
import org.activiti.rest.service.application.ActivitiRestServicesApplication;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.restlet.data.MediaType;
import org.restlet.data.Status;
import org.restlet.ext.fileupload.RestletFileUpload;
import org.restlet.representation.Representation;
import org.restlet.resource.Get;
import org.restlet.resource.Post;
import org.restlet.resource.ResourceException;

/**
 * @author Frederik Heremans
 */
public class TaskAttachmentCollectionResource extends TaskBaseResource {

    @Get
    public List<AttachmentResponse> getAttachments() {
        if (!authenticate())
            return null;

        List<AttachmentResponse> result = new ArrayList<AttachmentResponse>();
        RestResponseFactory responseFactory = getApplication(ActivitiRestServicesApplication.class)
                .getRestResponseFactory();
        HistoricTaskInstance task = getHistoricTaskFromRequest();

        for (Attachment attachment : ActivitiUtil.getTaskService().getTaskAttachments(task.getId())) {
            result.add(responseFactory.createAttachmentResponse(this, attachment));
        }

        return result;
    }

    @Post
    public AttachmentResponse createAttachment(Representation representation) {
        if (authenticate() == false)
            return null;
        AttachmentResponse result = null;
        Task task = getTaskFromRequest();
        try {
            if (MediaType.MULTIPART_FORM_DATA.isCompatible(representation.getMediaType())) {
                result = createBinaryAttachment(representation, task);
            } else {
                result = createSimpleAttachment(representation, task);
            }
        } catch (IOException e) {
            throw new ResourceException(Status.CLIENT_ERROR_BAD_REQUEST, e);
        } catch (FileUploadException e) {
            throw new ResourceException(Status.CLIENT_ERROR_BAD_REQUEST, e);
        }

        setStatus(Status.SUCCESS_CREATED);
        return result;
    }

    protected AttachmentResponse createSimpleAttachment(Representation representation, Task task)
            throws IOException {
        AttachmentRequest req = getConverterService().toObject(representation, AttachmentRequest.class, this);
        if (req.getName() == null) {
            throw new ActivitiIllegalArgumentException("Attachment name is required.");
        }

        Attachment createdAttachment = ActivitiUtil.getTaskService().createAttachment(req.getType(), task.getId(),
                task.getProcessInstanceId(), req.getName(), req.getDescription(), req.getExternalUrl());

        return getApplication(ActivitiRestServicesApplication.class).getRestResponseFactory()
                .createAttachmentResponse(this, createdAttachment);
    }

    protected AttachmentResponse createBinaryAttachment(Representation representation, Task task)
            throws FileUploadException, IOException {
        RestletFileUpload upload = new RestletFileUpload(new DiskFileItemFactory());
        List<FileItem> items = upload.parseRepresentation(representation);

        String name = null;
        String description = null;
        String type = null;
        FileItem uploadItem = null;

        for (FileItem fileItem : items) {
            if (fileItem.isFormField()) {
                if ("name".equals(fileItem.getFieldName())) {
                    name = fileItem.getString("UTF-8");
                } else if ("description".equals(fileItem.getFieldName())) {
                    description = fileItem.getString("UTF-8");
                } else if ("type".equals(fileItem.getFieldName())) {
                    type = fileItem.getString("UTF-8");
                }
            } else if (fileItem.getName() != null) {
                uploadItem = fileItem;
            }
        }

        if (name == null) {
            throw new ActivitiIllegalArgumentException("Attachment name is required.");
        }

        if (uploadItem == null) {
            throw new ActivitiIllegalArgumentException("Attachment content is required.");
        }

        Attachment createdAttachment = ActivitiUtil.getTaskService().createAttachment(type, task.getId(),
                task.getProcessInstanceId(), name, description, uploadItem.getInputStream());

        setStatus(Status.SUCCESS_CREATED);
        return getApplication(ActivitiRestServicesApplication.class).getRestResponseFactory()
                .createAttachmentResponse(this, createdAttachment);
    }
}