main/java/SimpleAuthenticator.java

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import javax.mail.*;
import java.net.InetAddress;
import java.awt.*;
import javax.swing.*;

/**
 * Simple Authenticator for requesting password information.
 *
 * @author  Christopher Cotton
 * @author  Bill Shannon
 */

public class SimpleAuthenticator extends Authenticator {

    Frame frame;
    String username;
    String password;

    public SimpleAuthenticator(Frame f) {
    this.frame = f;
    }

    protected PasswordAuthentication getPasswordAuthentication() {

    // given a prompt?
    String prompt = getRequestingPrompt();
    if (prompt == null)
        prompt = "Please login...";

    // protocol
    String protocol = getRequestingProtocol();
    if (protocol == null)
        protocol = "Unknown protocol";

    // get the host
    String host = null;
    InetAddress inet = getRequestingSite();
    if (inet != null)
        host = inet.getHostName();
    if (host == null)
        host = "Unknown host";

    // port
    String port = "";
    int portnum = getRequestingPort();
    if (portnum != -1)
        port = ", port " + portnum + " ";

    // Build the info string
    String info = "Connecting to " + protocol + " mail service on host " +
                                host + port;

    //JPanel d = new JPanel();
    // XXX - for some reason using a JPanel here causes JOptionPane
    // to display incorrectly, so we workaround the problem using
    // an anonymous JComponent.
    JComponent d = new JComponent() { };

    GridBagLayout gb = new GridBagLayout();
    GridBagConstraints c = new GridBagConstraints();
    d.setLayout(gb);
    c.insets = new Insets(2, 2, 2, 2);

    c.anchor = GridBagConstraints.WEST;
    c.gridwidth = GridBagConstraints.REMAINDER;
    c.weightx = 0.0;
    d.add(constrain(new JLabel(info), gb, c));
    d.add(constrain(new JLabel(prompt), gb, c));

    c.gridwidth = 1;
    c.anchor = GridBagConstraints.EAST;
    c.fill = GridBagConstraints.NONE;
    c.weightx = 0.0;
    d.add(constrain(new JLabel("Username:"), gb, c));

    c.anchor = GridBagConstraints.EAST;
    c.fill = GridBagConstraints.HORIZONTAL;
    c.gridwidth = GridBagConstraints.REMAINDER;
    c.weightx = 1.0;
    String user = getDefaultUserName();
    JTextField username = new JTextField(user, 20);
    d.add(constrain(username, gb, c));

    c.gridwidth = 1;
    c.fill = GridBagConstraints.NONE;
    c.anchor = GridBagConstraints.EAST;
    c.weightx = 0.0;
    d.add(constrain(new JLabel("Password:"), gb, c));

    c.anchor = GridBagConstraints.EAST;
    c.fill = GridBagConstraints.HORIZONTAL;
    c.gridwidth = GridBagConstraints.REMAINDER;
    c.weightx = 1.0;
    JPasswordField password = new JPasswordField("", 20);
    d.add(constrain(password, gb, c));
    // XXX - following doesn't work
    if (user != null && user.length() > 0)
        password.requestFocus();
    else
        username.requestFocus();

    int result = JOptionPane.showConfirmDialog(frame, d, "Login",
        JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);

    if (result == JOptionPane.OK_OPTION)
        return new PasswordAuthentication(username.getText(),
                        password.getText());
    else
        return null;
    }

    private Component constrain(Component cmp,
                GridBagLayout gb, GridBagConstraints c) {
    gb.setConstraints(cmp, c);
    return (cmp);
    }
}