UploadFileDebugServlet.java

/*
 * This program is free software; you can redistribute it and/or modify it under the 
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software 
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this 
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html 
 * or from the Free Software Foundation, Inc., 
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * Copyright 2008 - 2009 Pentaho Corporation.  All rights reserved.
 *
 *
 * Created May 26, 2009
 * @author rmansoor
 */
package org.pentaho.platform.dataaccess.datasource.wizard.service.impl;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.pentaho.platform.api.engine.IPentahoSession;
import org.pentaho.platform.dataaccess.datasource.wizard.service.impl.utils.PentahoSystemHelper;
import org.pentaho.platform.dataaccess.datasource.wizard.service.messages.Messages;
import org.pentaho.platform.engine.core.system.PentahoSystem;
import org.pentaho.platform.util.UUIDUtil;
import org.pentaho.platform.web.http.PentahoHttpSessionHelper;
import org.pentaho.reporting.libraries.base.util.StringUtils;

import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

public class UploadFileDebugServlet extends HttpServlet implements Servlet {

  private static final long serialVersionUID = 8305367618713715640L;

  private static final long MAX_FILE_SIZE = 300000;

  private static final long MAX_FOLDER_SIZE = 900000;
  
  public static final String DEFAULT_RELATIVE_UPLOAD_FILE_PATH = File.separatorChar + "system" + File.separatorChar + "metadata" + File.separatorChar + "csvfiles" + File.separatorChar; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$

  public UploadFileDebugServlet() {
    PentahoSystemHelper.init();
  }

  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    try {
     
      String relativePath = PentahoSystem.getSystemSetting("file-upload-defaults/relative-path", String.valueOf(DEFAULT_RELATIVE_UPLOAD_FILE_PATH));  //$NON-NLS-1$ 
      String maxFileLimit = PentahoSystem.getSystemSetting("file-upload-defaults/max-file-limit", String.valueOf(MAX_FILE_SIZE));  //$NON-NLS-1$    
      String maxFolderLimit = PentahoSystem.getSystemSetting("file-upload-defaults/max-folder-limit", String.valueOf(MAX_FOLDER_SIZE));  //$NON-NLS-1$
      IPentahoSession session = PentahoHttpSessionHelper.getPentahoSession(request);
      
      response.setContentType("text/plain"); //$NON-NLS-1$
      
      FileItem uploadItem = getFileItem(request);      
      if (uploadItem == null) {
        String error = Messages.getErrorString("UploadFileDebugServlet.ERROR_0001_NO_FILE_TO_UPLOAD"); //$NON-NLS-1$
        response.getWriter().write(error);
        return;
      }
      if (Long.parseLong(maxFileLimit) < uploadItem.getSize()) {
        String error = Messages.getErrorString("UploadFileDebugServlet.ERROR_0003_FILE_TOO_BIG"); //$NON-NLS-1$
        response.getWriter().write(error);
        return;
      }

      String path = PentahoSystem.getApplicationContext().getSolutionPath(relativePath);
      File pathDir = new File(path);
      // create the path if it doesn't exist yet
      if (!pathDir.exists()) {
        pathDir.mkdirs();
      }
      
      if (uploadItem.getSize() + getFolderSize(new File(path)) > Long.parseLong(maxFolderLimit)) {
        String error = Messages.getErrorString("UploadFileDebugServlet.ERROR_0004_FOLDER_SIZE_LIMIT_REACHED"); //$NON-NLS-1$ 
        response.getWriter().write(error);
        return;
      }
      
      String filename = request.getParameter("file_name"); //$NON-NLS-1$
      if(StringUtils.isEmpty(filename)) {
        filename = UUIDUtil.getUUID().toString();
      }
      
      String temporary = request.getParameter("mark_temporary"); //$NON-NLS-1$
      boolean isTemporary = false;
      if(temporary != null) {
        isTemporary = Boolean.valueOf(temporary);
      }

      File file;
      if(isTemporary) {
        file = PentahoSystem.getApplicationContext().createTempFile(session, "",".tmp", true); //$NON-NLS-1$
      } else {
        file = new File(path + File.separatorChar + filename);        
      }
      
      FileOutputStream outputStream = new FileOutputStream(file);
      byte[] fileContents = uploadItem.get();
      outputStream.write(fileContents);
      outputStream.flush();
      outputStream.close();
      
      response.getWriter().write(file.getName());
    } catch (Exception e) {
      String error =  Messages.getErrorString("UploadFileDebugServlet.ERROR_0005_UNKNOWN_ERROR", e.getLocalizedMessage());  //$NON-NLS-1$
      response.getWriter().write(error);
    }
  }
  
  private FileItem getFileItem(HttpServletRequest request) {
    FileItemFactory factory = new DiskFileItemFactory();
    ServletFileUpload upload = new ServletFileUpload(factory);
    try {
      List items = upload.parseRequest(request);
      Iterator it = items.iterator();
      while (it.hasNext()) {
        FileItem item = (FileItem) it.next();
        if (!item.isFormField() && "uploadFormElement".equals(item.getFieldName())) {//$NON-NLS-1$
          return item;
        }
      }
    } catch (FileUploadException e) {
      return null;
    }
    return null;
  }
  
  private long getFolderSize(File folder) {
    long foldersize = 0;
    File[] filelist = folder.listFiles();
    for (int i = 0; i < filelist.length; i++) {
      if (filelist[i].isDirectory()) {
        foldersize += getFolderSize(filelist[i]);
      } else {
        foldersize += filelist[i].length();
      }
    }
    return foldersize;
  }
}