/*
* @(#)TtyAuthenticator.java 1.2 04/01/08
*
* Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
*/
import java.io.*;
import java.net.*;
import javax.mail.*;
import javax.mail.PasswordAuthentication;
import javax.mail.Authenticator;
/**
* A simple Authenticator that prompts for the user name and password on stdin.
* Puts up a dialog something like:
* <p> <pre>
* Connecting to <protocol> mail service on host <addr>, port <port>.
* <prompt>
*
* User Name: [defaultUserName]
* Password:
* </pre> <p>
*
* @author Bill Shannon
*/
public class TtyAuthenticator extends Authenticator {
/**
* @return The PasswordAuthentication collected from the
* user, or null if none is provided.
*/
protected PasswordAuthentication getPasswordAuthentication() {
BufferedReader in = new BufferedReader(
new InputStreamReader((System.in)));
StringBuffer sb = new StringBuffer();
sb.append("Connecting to ");
sb.append(getRequestingProtocol());
sb.append(" mail service on host ");
sb.append(getRequestingSite().getHostName());
int port = getRequestingPort();
if (port > 0) {
sb.append(", port ");
sb.append(port);
}
sb.append(".");
System.out.println(sb.toString());
String prompt = getRequestingPrompt();
if (prompt != null)
System.out.println(prompt);
System.out.println();
String userName = get(in, "User Name", getDefaultUserName());
String password = get(in, "Password", null);
if (userName == null)
return null;
else
return new PasswordAuthentication(userName, password);
}
private static final String get(BufferedReader in,
String name, String value) {
PrintStream p = System.out;
p.print(name + ": ");
if (value != null)
p.print("[" + value + "] ");
p.flush();
try {
String s = in.readLine();
if (s.length() == 0)
return value;
else
return s;
} catch (IOException e) {
return value;
}
}
// main program, for debugging.
// Usage: java TtyAuthenticator host port protocol prompt defaultUser
public static void main(String argv[]) throws Exception {
Session sess = Session.getInstance(System.getProperties(),
new TtyAuthenticator());
PasswordAuthentication pw = sess.requestPasswordAuthentication(
InetAddress.getByName(argv[0]),
Integer.parseInt(argv[1]), argv[2], z(argv[3]), z(argv[4]));
System.out.println("User: " + n(pw.getUserName()));
System.out.println("Password: " + n(pw.getPassword()));
}
private static final String n(String s) {
return s == null ? "<null>" : s;
}
private static final String z(String s) {
return s.length() > 0 ? s : null;
}
}
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