1   /**
2    * Copyright (c) 2000-2009 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.StringPool;
26  import com.liferay.portal.kernel.util.StringUtil;
27  import com.liferay.portal.kernel.util.Validator;
28  
29  /**
30   * <a href="CreditCard.java.html"><b><i>View Source</i></b></a>
31   *
32   * @author Brian Wing Shun Chan
33   *
34   */
35  public class CreditCard {
36  
37      public static String hide(String number) {
38          return hide(number, StringPool.STAR);
39      }
40  
41      public static String hide(String number, String x) {
42          if (number == null) {
43              return number;
44          }
45  
46          int numberLen = number.length();
47  
48          if (numberLen > 4) {
49              StringBuilder sb = new StringBuilder();
50  
51              for (int i = 0; i < numberLen - 4; i++) {
52                  sb.append(x);
53              }
54  
55              sb.append(number.substring(numberLen - 4, numberLen));
56  
57              number = sb.toString();
58          }
59  
60          return number;
61      }
62  
63      public static boolean isValid(String number, String type) {
64          number = StringUtil.extractDigits(number);
65  
66          if (type.equals("visa")) {
67              if (!number.startsWith("4")) {
68                  return false;
69              }
70  
71              if (number.length() != 13 &&
72                  number.length() != 16) {
73  
74                  return false;
75              }
76          }
77          else if (type.equals("mastercard")) {
78              if (!number.startsWith("51") &&
79                  !number.startsWith("52") &&
80                  !number.startsWith("53") &&
81                  !number.startsWith("54") &&
82                  !number.startsWith("55")) {
83  
84                  return false;
85              }
86  
87              if (number.length() != 16) {
88                  return false;
89              }
90          }
91          else if (type.equals("discover")) {
92              if (!number.startsWith("6011")) {
93  
94                  return false;
95              }
96  
97              if (number.length() != 16) {
98                  return false;
99              }
100         }
101         else if (type.equals("amex")) {
102             if (!number.startsWith("34") &&
103                 !number.startsWith("35") &&
104                 !number.startsWith("36") &&
105                 !number.startsWith("37")) {
106 
107                 return false;
108             }
109 
110             if (number.length() != 15) {
111                 return false;
112             }
113         }
114 
115         return Validator.isLUHN(number);
116     }
117 
118 }