001    /**
002     * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.util;
016    
017    import com.liferay.portal.kernel.util.StringUtil;
018    import com.liferay.portal.kernel.util.Validator;
019    
020    /**
021     * @author Brian Wing Shun Chan
022     * @author Amos Fong
023     */
024    public class PwdGenerator {
025    
026            public static String KEY1 = "0123456789";
027    
028            public static String KEY2 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
029    
030            public static String KEY3 = "abcdefghijklmnopqrstuvwxyz";
031    
032            public static String getPinNumber() {
033                    return _getPassword(KEY1, 4, true);
034            }
035    
036            public static String getPassword() {
037                    return getPassword(8);
038            }
039    
040            public static String getPassword(int length) {
041                    return _getPassword(KEY1 + KEY2 + KEY3, length, true);
042            }
043    
044            public static String getPassword(String key, int length) {
045                    return getPassword(key, length, true);
046            }
047    
048            public static String getPassword(
049                    String key, int length, boolean useAllKeys) {
050    
051                    return _getPassword(key, length, useAllKeys);
052            }
053    
054            private static String _getPassword(
055                    String key, int length, boolean useAllKeys) {
056    
057                    StringBuilder sb = new StringBuilder(length);
058    
059                    for (int i = 0; i < length; i++) {
060                            sb.append(key.charAt((int)(Math.random() * key.length())));
061                    }
062    
063                    String password = sb.toString();
064    
065                    if (!useAllKeys) {
066                            return password;
067                    }
068    
069                    boolean invalidPassword = false;
070    
071                    if (key.contains(KEY1)) {
072                            if (Validator.isNull(StringUtil.extractDigits(password))) {
073                                    invalidPassword = true;
074                            }
075                    }
076    
077                    if (key.contains(KEY2)) {
078                            if (password.equals(password.toLowerCase())) {
079                                    invalidPassword = true;
080                            }
081                    }
082    
083                    if (key.contains(KEY3)) {
084                            if (password.equals(password.toUpperCase())) {
085                                    invalidPassword = true;
086                            }
087                    }
088    
089                    if (invalidPassword) {
090                            return _getPassword(key, length, useAllKeys);
091                    }
092    
093                    return password;
094            }
095    
096    }