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1.1
date	2001.07.19.00.40.49;	author dlr;	state Exp;
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@/* ================================================================
 * Copyright (c) 2000 CollabNet.  All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * 3. The end-user documentation included with the redistribution, if
 * any, must include the following acknowlegement: "This product includes
 * software developed by CollabNet (http://www.CollabNet/)."
 * Alternately, this acknowlegement may appear in the software itself, if
 * and wherever such third-party acknowlegements normally appear.
 * 
 * 4. The hosted project names must not be used to endorse or promote
 * products derived from this software without prior written
 * permission. For written permission, please contact info@@collab.net.
 * 
 * 5. Products derived from this software may not use the "Tigris" name
 * nor may "Tigris" appear in their names without prior written
 * permission of CollabNet.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL COLLAB.NET OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
 * individuals on behalf of CollabNet.
 */

package org.tigris.helm.tool;

import java.lang.Math;
import java.util.Random;

/**
 * Generates a random password.
 *
 * @@author <a href="mailto:davidp@@dataweb-systems.com">David C. Pellegrini</a>
 * @@version $Revision: 1.5 $
 *
 * Copyright (c) 1999 dataweb systems, inc.
 * Copyright (c) 1999-2001 CollabNet, Inc.
 */
public class PasswordGenerator
{
    private static final int DEFAULT_PASSWD_LEN = 8;

    private static final String PASSWD_CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz./!#$%&*-_+=";

    /**
     * Runs the generator.
     *
     * @@param args The length of the password to generate, or nothing if the 
     *             default length is desired.
     */
    public static void main(String[] args)
    {
        if (args.length == 1)
        {
            int passwordLength = Integer.parseInt(args[0]);
            System.out.println("New password: " + password(passwordLength));
        }
        else
        {
            System.out.println("New password: " + password());
        }
    }

    /**
     * Generates a random password of a default length.
     *
     * @@return A string of random characters of a standard length.
     */
    public static final String password()
    {
        return password(DEFAULT_PASSWD_LEN);
    }

    /**
     * Generates a random password of the specified length.
     *
     * @@param length The number of characters required for the password.
     * @@return       A string of random characters of the specified length.
     */
    public static final String password(int length)
    {
        StringBuffer password = new StringBuffer();

        Random rand = new Random();
        int offset;
        for (int i = 0; i < length; i++)
        {
            offset = Math.abs(rand.nextInt());
            password.append
                (PASSWD_CHARS.charAt(offset % PASSWD_CHARS.length()));
        }

        return password.toString();
    }
}
@
