org.komodo.web.backend.server.servlets.DataVirtUploadServlet.java Source code

Introduction

Here is the source code for org.komodo.web.backend.server.servlets.DataVirtUploadServlet.java

Source

/*
 * Copyright 2014 JBoss Inc
 *
 * 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.komodo.web.backend.server.servlets;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.codehaus.jackson.JsonEncoding;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;

/**
 * A standard servlet that file content is POSTed to in order to add new files (drivers and vdbs) to the Teiid Server.
 *
 * @author mdrillin@redhat.com
 */
public class DataVirtUploadServlet extends HttpServlet {

    private static final long serialVersionUID = DataVirtUploadServlet.class.hashCode();

    /**
     * Constructor.
     */
    public DataVirtUploadServlet() {
    }

    /**
     * @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse response)
            throws ServletException, IOException {
        // Extract the relevant content from the POST'd form
        if (ServletFileUpload.isMultipartContent(req)) {
            Map<String, String> responseMap;
            FileItemFactory factory = new DiskFileItemFactory();
            ServletFileUpload upload = new ServletFileUpload(factory);

            // Parse the request
            String deploymentName = null;
            String fileName = null;
            InputStream fileContent = null;
            try {
                List<FileItem> items = upload.parseRequest(req);
                boolean isDriver = false;
                for (FileItem item : items) {
                    // Deployment name for drivers
                    if (item.isFormField()) {
                        if (item.getFieldName().equals("driverDeploymentName")) {
                            deploymentName = item.getString();
                            isDriver = true;
                        }
                        // File Content
                    } else {
                        fileName = item.getName();
                        if (fileName != null)
                            fileName = FilenameUtils.getName(fileName);
                        fileContent = item.getInputStream();
                    }
                }

                // Now that the content has been extracted, upload
                if (isDriver) {
                    responseMap = uploadDriver(deploymentName, fileContent);
                } else {
                    responseMap = uploadVdb(fileName, fileContent);
                }
            } catch (Throwable e) {
                responseMap = new HashMap<String, String>();
                responseMap.put("exception", "true"); //$NON-NLS-1$ //$NON-NLS-2$
                responseMap.put("exception-message", e.getMessage()); //$NON-NLS-1$
                //            responseMap.put("exception-stack", ExceptionUtils.getRootStackTrace(e)); //$NON-NLS-1$
            } finally {
                IOUtils.closeQuietly(fileContent);
            }
            writeToResponse(responseMap, response);
        } else {
            response.sendError(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE, "Content type not supported"); //$NON-NLS-1$
        }
    }

    /**
     * Uploads a driver to the Teiid Server
     * @param driverDeploymentName
     * @param driverContent
     * @return responseParams
     * @throws Exception
     */
    private Map<String, String> uploadDriver(String driverDeploymentName, InputStream driverContent)
            throws Exception {

        Map<String, String> responseParams = new HashMap<String, String>();

        //      // Deploy the driver
        //        InputStream contentStream = null;
        //      try {
        //         clientAccessor.getClient().deploy(driverDeploymentName, driverContent);
        //      } finally {
        //         IOUtils.closeQuietly(contentStream);
        //      }

        return responseParams;
    }

    /**
     * Uploads a VDB to the Teiid Server
     * @param driverDeploymentName
     * @param driverContent
     * @return responseParams
     * @throws Exception
     */
    private Map<String, String> uploadVdb(String vdbFileName, InputStream vdbContent) throws Exception {

        Map<String, String> responseParams = new HashMap<String, String>();

        //       if(vdbFileName.endsWith(Constants.DYNAMIC_VDB_SUFFIX) || vdbFileName.endsWith(".vdb")) {
        //          teiidService.deployVdbWithSource(vdbFileName, vdbContent);
        //       }

        return responseParams;

    }

    /**
     * Writes the response values back to the http response.  This allows the calling code to
     * parse the response values for display to the user.
     *
     * @param responseMap the response params to write to the http response
     * @param response the http response
     * @throws IOException
     */
    private static void writeToResponse(Map<String, String> responseMap, HttpServletResponse response)
            throws IOException {
        // Note: setting the content-type to text/html because otherwise IE prompt the user to download
        // the result rather than handing it off to the GWT form response handler.
        // See JIRA issue https://issues.jboss.org/browse/SRAMPUI-103
        response.setContentType("text/html; charset=UTF8"); //$NON-NLS-1$
        JsonFactory f = new JsonFactory();
        JsonGenerator g = f.createJsonGenerator(response.getOutputStream(), JsonEncoding.UTF8);
        g.useDefaultPrettyPrinter();
        g.writeStartObject();
        for (java.util.Map.Entry<String, String> entry : responseMap.entrySet()) {
            String key = entry.getKey();
            String val = entry.getValue();
            g.writeStringField(key, val);
        }
        g.writeEndObject();
        g.flush();
        g.close();
    }
}