package webIM;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
/**
* Title: Validate
* Description: This servlet is the first one invoked in the application, i.e.,
* when the user submits a username and password. A session is
* created and initialized, and control is passed to a JSP page
* that will build the buddy list.
* Copyright: Copyright (c) 2001
* Company: UCCS Computer Science Department
* @author Merlin Vincent
* @version 1.0
*/
public class Validate extends HttpServlet
{
private static final String CONTENT_TYPE = "text/html";
/**Initialize global variables*/
public void init(ServletConfig config) throws ServletException
{
super.init(config);
}
/**Process the HTTP Post request*/
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
response.setContentType(CONTENT_TYPE);
PrintWriter out = response.getWriter();
String userIn = null;
String passwdIn = null;
HttpSession session = null;
ServletContext context = null;
try
{
// Retrieve the POSTed username and password
userIn = request.getParameter("UserName");
passwdIn = request.getParameter("Password");
// Retrieving the password will verify the user has a properties file.
String passwdLocal = getCustomerInfo( userIn, "Password" );
if ( !passwdIn.equals( passwdLocal )) {
out.println("");
out.println("
Incorrect password...
");
out.println("");
}
else {
// Create and initialize a session for this user.
String nickname = getCustomerInfo( userIn, "NickName" );
session = request.getSession(true);
session.setAttribute("username", userIn);
session.setAttribute("nickname", nickname);
context = getServletContext();
context.setAttribute(nickname+"selectedBuddy", "none");
/**
* Each user has a login status file in their public_html/web directory,
* i.e., http://cs.uccs.edu/~/webIM/_online.jpg
* or _offline.jpg. In real life these would be manipulated
* by the program to reflect status... I haven't found a way to do
* that from Java yet, and it's a minor matter, so I fake it with
* shell scripts. Useless code follows...
*/
String path = "/users/server/students/~"+ userIn + "/public_html/webIM/";
File loginStatusFile = new File(nickname +"_offline.jpg");
// Forward control to the JSP that builds the buddy list.
RequestDispatcher dispatcher =
getServletContext().getRequestDispatcher( "/createBuddyList.jsp" );
dispatcher.forward( request, response );
}
} catch (MissingResourceException mre) {
out.println("");
out.println("
Unknown user "+ userIn +"
");
out.println("");
} catch (IOException ioe) {
out.println("");
out.println("
Unable to create login status file...
");
out.println("");
} catch (Exception e) {
throw new ServletException("doPost: "+ e.toString());
}
}
/**
* Method: getCustomerInfo
*
* This method retrieves a value from the customer's properties file.
*/
public static String getCustomerInfo( String custName, String key ) throws Exception
{
String ret = null;
ResourceBundle m_custInfo = null;
try {
if(( key != null ) && !key.equals( "" ))
{
if (m_custInfo == null) {
m_custInfo = ResourceBundle.getBundle( custName );
}
ret = m_custInfo.getString( key );
}
} catch (Exception e) {
throw new Exception("getCustomerInfo: "+ e.toString());
}
return ret;
}
/**Clean up resources*/
public void destroy()
{
}
}