1   /**
2    * Copyright (c) 2000-2007 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.util;
24  
25  import com.liferay.portal.kernel.util.StringMaker;
26  import com.liferay.portal.kernel.util.StringPool;
27  import com.liferay.portal.kernel.util.StringUtil;
28  import com.liferay.portal.kernel.util.Validator;
29  
30  /**
31   * <a href="CreditCard.java.html"><b><i>View Source</i></b></a>
32   *
33   * @author Brian Wing Shun Chan
34   *
35   */
36  public class CreditCard {
37  
38      public static String hide(String number) {
39          return hide(number, StringPool.STAR);
40      }
41  
42      public static String hide(String number, String x) {
43          if (number == null) {
44              return number;
45          }
46  
47          int numberLen = number.length();
48  
49          if (numberLen > 4) {
50              StringMaker sm = new StringMaker();
51  
52              for (int i = 0; i < numberLen - 4; i++) {
53                  sm.append(x);
54              }
55  
56              sm.append(number.substring(numberLen - 4, numberLen));
57  
58              number = sm.toString();
59          }
60  
61          return number;
62      }
63  
64      public static boolean isValid(String number, String type) {
65          number = StringUtil.extractDigits(number);
66  
67          if (type.equals("visa")) {
68              if (!number.startsWith("4")) {
69                  return false;
70              }
71  
72              if (number.length() != 13 &&
73                  number.length() != 16) {
74  
75                  return false;
76              }
77          }
78          else if (type.equals("mastercard")) {
79              if (!number.startsWith("51") &&
80                  !number.startsWith("52") &&
81                  !number.startsWith("53") &&
82                  !number.startsWith("54") &&
83                  !number.startsWith("55")) {
84  
85                  return false;
86              }
87  
88              if (number.length() != 16) {
89                  return false;
90              }
91          }
92          else if (type.equals("discover")) {
93              if (!number.startsWith("6011")) {
94  
95                  return false;
96              }
97  
98              if (number.length() != 16) {
99                  return false;
100             }
101         }
102         else if (type.equals("amex")) {
103             if (!number.startsWith("34") &&
104                 !number.startsWith("35") &&
105                 !number.startsWith("36") &&
106                 !number.startsWith("37")) {
107 
108                 return false;
109             }
110 
111             if (number.length() != 15) {
112                 return false;
113             }
114         }
115 
116         return Validator.isLUHN(number);
117     }
118 
119 }