package imap;
import java.io.*;
import java.net.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
// Using the IMAP protocol
// This servlet is the one that stores the login information
// to a cookie (for use by the other servlets in this project)
// and also report to you how many new messages are this user's
// inbox (those withthe recent flag attached to them)
// You can only go to mailboxes viewing mode from here
public class ImapLogon extends HttpServlet {
// Defining resulting object out from request req and response res
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setContentType("text/html");
ServletOutputStream out=res.getOutputStream();
try {
// Retrieve parameter information
String username=req.getParameter("username");
String password=req.getParameter("password");
String hostname=req.getParameter("hostname");
// Check to make sure entries were made for all request parameters
if (username.equals("")) {
throw new ServletException("Missing Username");
}
if (password.equals("")) {
throw new ServletException("Missing Password");
}
if (hostname.equals("")) {
throw new ServletException("Missing Hostname");
}
// Open a cookie for username/password
Cookie usercookie=new Cookie("username", username);
Cookie passcookie=new Cookie("password", password);
Cookie hostcookie=new Cookie("hostname", hostname);
res.addCookie(usercookie);
res.addCookie(passcookie);
res.addCookie(hostcookie);
// Creating a socket to the desired hostname's IMAP port
Socket socket=new Socket(hostname, 143);
PrintStream write_socket=new PrintStream(socket.getOutputStream());
DataInputStream read_socket=new DataInputStream(socket.getInputStream());
// Make sure target IMAP port is ready
String imap_res=read_socket.readLine();
if (! imap_res.startsWith("* OK"))
throw new ServletException("IMAP Server was not reachable this time");
int command=1;
// Make sure a correct username and/or password is provided
write_socket.println(command+" login "+username+" "+password);
imap_res=read_socket.readLine();
if (! imap_res.startsWith(command+" OK"))
throw new ServletException("Invalid Username and/or Password");
command++;
String newemails="0";
// Find out how much mail the user has
write_socket.println(command+" select inbox");
imap_res=read_socket.readLine();
while (! imap_res.startsWith(command+" OK")) {
StringTokenizer breakline=new StringTokenizer(imap_res, " ");
breakline.nextToken();
String secondword=breakline.nextToken();
String thirdword=breakline.nextToken();
if (thirdword.equals("RECENT"))
newemails=secondword;
imap_res=read_socket.readLine();
}
out.println("");
out.println("Login for "+username+" on "+hostname+"");
out.println("Login for "+username+" on "+hostname+"
");
if (newemails.equals("0"))
out.println("You have no new mail.");
else
out.println("You have "+newemails+" new mail(s).");
out.println("");
command++;
write_socket.println(command+" logout");
}
catch (ServletException e) {
out.println(""+e+"");
out.println(""+e+"");
}
catch (UnknownHostException e) {
out.println("Unknown Host");
out.println(""+e);
out.println("The hostname supplied is not recognized, try a different hostname.");
out.println("");
}
catch (IOException e) {
out.println("IOException");
out.println(""+e);
out.println("");
}
}
}