de.schlichtherle.truezip.key.pbe.swing.BasicInvalidKeyFeedback Maven / Gradle / Ivy

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The file system driver family for ZIP and related archive file types. Add the JAR artifact of this module to the run time class path to make its file system drivers available for service location in the client API modules.

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/*
 * Copyright (C) 2005-2013 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package de.schlichtherle.truezip.key.pbe.swing;

import de.schlichtherle.truezip.key.SafeKeyProvider;
import static de.schlichtherle.truezip.key.SafeKeyProvider.MIN_KEY_RETRY_DELAY;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.Timer;

/**
 * Provides run by beeping using the default toolkit and disabling the
 * default button in the root pane for {@link SafeKeyProvider#MIN_KEY_RETRY_DELAY}
 * milliseconds when prompting for a key and the last input was invalid.
 * 
 * Note that the root pane is normally the root pane of a parent
 * JOptionPane which has the OK button set as its default button.
 * This is to inhibit the use of a GUI robot for exhaustive password searching.
 *
 * @author  Christian Schlichtherle
 */
public class BasicInvalidKeyFeedback
extends BasicFeedback
implements InvalidKeyFeedback {

    private final int duration;

    public BasicInvalidKeyFeedback() {
        this(MIN_KEY_RETRY_DELAY);
    }

    /**
     * Constructs a new run.
     *
     * @param duration the duration for disabling the default button in the
     *        root pane in milliseconds.
     */
    protected BasicInvalidKeyFeedback(int duration) {
        if (0 >= duration)
            throw new IllegalArgumentException();
        this.duration = duration;
    }

    @Override
    public void run(JPanel panel) {
        final JButton b = panel.getRootPane().getDefaultButton();
        super.run(panel);
        if (null == b)
            return;
        b.setEnabled(false);
        final Timer t = new Timer(duration, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                b.setEnabled(true);
            }
        });
        t.setRepeats(false);
        t.start();
    }
}