1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * The contents of this file are subject to the terms of the Liferay Enterprise
5    * Subscription License ("License"). You may not use this file except in
6    * compliance with the License. You can obtain a copy of the License by
7    * contacting Liferay, Inc. See the License for the specific language governing
8    * permissions and limitations under the License, including but not limited to
9    * distribution rights of the Software.
10   *
11   *
12   *
13   */
14  
15  package com.liferay.util;
16  
17  import com.liferay.portal.kernel.util.StringUtil;
18  import com.liferay.portal.kernel.util.Validator;
19  
20  /**
21   * <a href="PwdGenerator.java.html"><b><i>View Source</i></b></a>
22   *
23   * @author Brian Wing Shun Chan
24   * @author Amos Fong
25   */
26  public class PwdGenerator {
27  
28      public static String KEY1 = "0123456789";
29  
30      public static String KEY2 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
31  
32      public static String KEY3 = "abcdefghijklmnopqrstuvwxyz";
33  
34      public static String getPinNumber() {
35          return _getPassword(KEY1, 4, true);
36      }
37  
38      public static String getPassword() {
39          return getPassword(8);
40      }
41  
42      public static String getPassword(int length) {
43          return _getPassword(KEY1 + KEY2 + KEY3, length, true);
44      }
45  
46      public static String getPassword(String key, int length) {
47          return getPassword(key, length, true);
48      }
49  
50      public static String getPassword(
51          String key, int length, boolean useAllKeys) {
52  
53          return _getPassword(key, length, useAllKeys);
54      }
55  
56      private static String _getPassword(
57          String key, int length, boolean useAllKeys) {
58  
59          StringBuilder sb = new StringBuilder(length);
60  
61          for (int i = 0; i < length; i++) {
62              sb.append(key.charAt((int)(Math.random() * key.length())));
63          }
64  
65          String password = sb.toString();
66  
67          if (!useAllKeys) {
68              return password;
69          }
70  
71          boolean invalidPassword = false;
72  
73          if (key.contains(KEY1)) {
74              if (Validator.isNull(StringUtil.extractDigits(password))) {
75                  invalidPassword = true;
76              }
77          }
78  
79          if (key.contains(KEY2)) {
80              if (password.equals(password.toLowerCase())) {
81                  invalidPassword = true;
82              }
83          }
84  
85          if (key.contains(KEY3)) {
86              if (password.equals(password.toUpperCase())) {
87                  invalidPassword = true;
88              }
89          }
90  
91          if (invalidPassword) {
92              return _getPassword(key, length, useAllKeys);
93          }
94  
95          return password;
96      }
97  
98  }