/**
    * Copyright 2005-2012 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.rice.ksb.security.admin;
  
  import java.io.IOException;
  
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  /**
   * A servlet which returns a client {@link java.security.KeyStore} object to the user as a file.  It takes in
   * the KeyStore file as a session attribute byte array.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class ExportServlet extends HttpServlet {
  
      private static final long serialVersionUID = 3234778044685975458L;
      
      private static final String MIME_TYPE = "application/octet-stream";
  //    application/pkix-cert
  //    application/pkix-crl
      public static final String CLIENT_KEYSTORE_DATA = "ClientKeyStoreData";
      
      protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          byte[] clientKeyStoreData = (byte[])request.getSession().getAttribute(CLIENT_KEYSTORE_DATA);
          request.getSession().removeAttribute(CLIENT_KEYSTORE_DATA);
          if (clientKeyStoreData == null) {
              throw new ServletException("No keystore file was specified.");
          }
          response.setContentType(MIME_TYPE);
          response.setContentLength(clientKeyStoreData.length);
          response.setHeader("Content-disposition", "attachment; filename="+extractFileName(request));
          response.getOutputStream().write(clientKeyStoreData);
          response.getOutputStream().close();
      }
  
      protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          doPost(request, response);
      }
  
      private String extractFileName(HttpServletRequest request) {
          String path = request.getPathInfo();
          int index = path.lastIndexOf('/');
          if (index >= 0) {
              path = path.substring(index+1);
          }
          return path;
      }
  
      public static final String generateExportPath(String keystoreFileName, HttpServletRequest request) {
          String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath();
          return basePath + "/exportsecurity/"+keystoreFileName;
      }
  
  }