code.grnet.gr Git - pithos/blob - src/gr/ebs/gss/server/NonceIssuer.java

   1 /*
   2  * Copyright 2008, 2009 Electronic Business Systems Ltd.
   3  *
   4  * This file is part of GSS.
   5  *
   6  * GSS is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GSS is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GSS.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19 package gr.ebs.gss.server;
  20
  21 import gr.ebs.gss.client.exceptions.ObjectNotFoundException;
  22 import gr.ebs.gss.client.exceptions.RpcException;
  23 import gr.ebs.gss.server.domain.Nonce;
  24 import gr.ebs.gss.server.domain.User;
  25
  26 import java.io.IOException;
  27 import java.io.PrintWriter;
  28
  29 import javax.servlet.http.HttpServletRequest;
  30 import javax.servlet.http.HttpServletResponse;
  31
  32 import org.apache.commons.logging.Log;
  33 import org.apache.commons.logging.LogFactory;
  34
  35 /**
  36  * The servlet that handles nonce creation.
  37  *
  38  * @author past
  39  */
  40 public class NonceIssuer extends BaseServlet {
  41         /**
  42          * The serial version UID of the class.
  43          */
  44         private static final long serialVersionUID = 1L;
  45
  46         /**
  47          * The request parameter name for the user.
  48          */
  49         private static final String USER_PARAM = "user";
  50
  51         /**
  52          * The logger.
  53          */
  54         private static Log logger = LogFactory.getLog(NonceIssuer.class);
  55
  56         @Override
  57         public void service(HttpServletRequest request, HttpServletResponse response) throws IOException {
  58                 String username = request.getParameter(USER_PARAM);
  59                 User user = null;
  60                 Nonce nonce = null;
  61                 if (username == null) {
  62                         String error = "No username supplied";
  63                         logger.info(error);
  64                         response.setContentType("text/html");
  65                         response.sendError(HttpServletResponse.SC_FORBIDDEN, error);
  66                         return;
  67                 }
  68                 try {
  69                         user = getService().findUser(username);
  70                         if (user == null) {
  71                                 String error = "User was not found";
  72                                 logger.error(error);
  73                                 response.setContentType("text/html");
  74                                 response.sendError(HttpServletResponse.SC_FORBIDDEN, error);
  75                                 return;
  76                         }
  77                         nonce = getService().createNonce(user.getId());
  78                 } catch (RpcException e) {
  79                         String error = "An error occurred while communicating with the service";
  80                         logger.error(error, e);
  81                         response.setContentType("text/html");
  82                         response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, error);
  83                         return;
  84                 } catch (ObjectNotFoundException e) {
  85                         // The user might not be found in createNonce() since there
  86                         // is no transaction spanning the consecutive service calls.
  87                         String error = "The user was not found";
  88                         logger.error(error, e);
  89                         response.setContentType("text/html");
  90                         response.sendError(HttpServletResponse.SC_FORBIDDEN, error);
  91                         return;
  92                 }
  93                 if (logger.isDebugEnabled())
  94                         logger.debug("user: "+user.getUsername()+" nonce: "+nonce.getEncodedNonce());
  95                 response.setContentType("text/plain");
  96             PrintWriter out = response.getWriter();
  97             out.println(nonce.getEncodedNonce());
  98         }
  99 }