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org.apache.commons.validator.CreditCardValidator$Discover |
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1 | /* |
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2 | * $Id: CreditCardValidator.java 366867 2006-01-07 17:55:14Z niallp $ |
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3 | * $Rev: 366867 $ |
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4 | * $Date: 2006-01-07 17:55:14 +0000 (Sat, 07 Jan 2006) $ |
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5 | * |
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6 | * ==================================================================== |
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7 | * Copyright 2001-2006 The Apache Software Foundation |
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8 | * |
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9 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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10 | * you may not use this file except in compliance with the License. |
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11 | * You may obtain a copy of the License at |
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12 | * |
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13 | * http://www.apache.org/licenses/LICENSE-2.0 |
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14 | * |
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15 | * Unless required by applicable law or agreed to in writing, software |
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16 | * distributed under the License is distributed on an "AS IS" BASIS, |
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17 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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18 | * See the License for the specific language governing permissions and |
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19 | * limitations under the License. |
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20 | */ |
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21 | ||
22 | package org.apache.commons.validator; |
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23 | ||
24 | import java.util.ArrayList; |
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25 | import java.util.Collection; |
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26 | import java.util.Iterator; |
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27 | ||
28 | import org.apache.commons.validator.util.Flags; |
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29 | ||
30 | /** |
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31 | * <p>Perform credit card validations.</p> |
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32 | * <p> |
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33 | * By default, all supported card types are allowed. You can specify which |
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34 | * cards should pass validation by configuring the validation options. For |
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35 | * example,<br/><code>CreditCardValidator ccv = new CreditCardValidator(CreditCardValidator.AMEX + CreditCardValidator.VISA);</code> |
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36 | * configures the validator to only pass American Express and Visa cards. |
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37 | * If a card type is not directly supported by this class, you can implement |
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38 | * the CreditCardType interface and pass an instance into the |
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39 | * <code>addAllowedCardType</code> method. |
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40 | * </p> |
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41 | * For a similar implementation in Perl, reference Sean M. Burke's |
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42 | * <a href="http://www.speech.cs.cmu.edu/~sburke/pub/luhn_lib.html">script</a>. |
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43 | * More information is also available |
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44 | * <a href="http://www.merriampark.com/anatomycc.htm">here</a>. |
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45 | * |
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46 | * @since Validator 1.1 |
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47 | */ |
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48 | public class CreditCardValidator { |
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49 | ||
50 | /** |
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51 | * Option specifying that no cards are allowed. This is useful if |
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52 | * you want only custom card types to validate so you turn off the |
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53 | * default cards with this option. |
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54 | * <br/> |
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55 | * <pre> |
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56 | * CreditCardValidator v = new CreditCardValidator(CreditCardValidator.NONE); |
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57 | * v.addAllowedCardType(customType); |
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58 | * v.isValid(aCardNumber); |
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59 | * </pre> |
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60 | * @since Validator 1.1.2 |
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61 | */ |
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62 | public static final int NONE = 0; |
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63 | ||
64 | /** |
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65 | * Option specifying that American Express cards are allowed. |
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66 | */ |
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67 | public static final int AMEX = 1 << 0; |
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68 | ||
69 | /** |
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70 | * Option specifying that Visa cards are allowed. |
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71 | */ |
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72 | public static final int VISA = 1 << 1; |
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73 | ||
74 | /** |
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75 | * Option specifying that Mastercard cards are allowed. |
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76 | */ |
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77 | public static final int MASTERCARD = 1 << 2; |
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78 | ||
79 | /** |
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80 | * Option specifying that Discover cards are allowed. |
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81 | */ |
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82 | public static final int DISCOVER = 1 << 3; |
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83 | ||
84 | /** |
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85 | * The CreditCardTypes that are allowed to pass validation. |
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86 | */ |
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87 | private Collection cardTypes = new ArrayList(); |
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88 | ||
89 | /** |
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90 | * Create a new CreditCardValidator with default options. |
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91 | */ |
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92 | public CreditCardValidator() { |
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93 | this(AMEX + VISA + MASTERCARD + DISCOVER); |
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94 | } |
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95 | ||
96 | /** |
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97 | * Create a new CreditCardValidator with the specified options. |
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98 | * @param options Pass in |
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99 | * CreditCardValidator.VISA + CreditCardValidator.AMEX to specify that |
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100 | * those are the only valid card types. |
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101 | */ |
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102 | public CreditCardValidator(int options) { |
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103 | super(); |
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104 | ||
105 | Flags f = new Flags(options); |
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106 | if (f.isOn(VISA)) { |
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107 | this.cardTypes.add(new Visa()); |
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108 | } |
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109 | ||
110 | if (f.isOn(AMEX)) { |
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111 | this.cardTypes.add(new Amex()); |
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112 | } |
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113 | ||
114 | if (f.isOn(MASTERCARD)) { |
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115 | this.cardTypes.add(new Mastercard()); |
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116 | } |
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117 | ||
118 | if (f.isOn(DISCOVER)) { |
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119 | this.cardTypes.add(new Discover()); |
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120 | } |
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121 | } |
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122 | ||
123 | /** |
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124 | * Checks if the field is a valid credit card number. |
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125 | * @param card The card number to validate. |
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126 | * @return Whether the card number is valid. |
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127 | */ |
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128 | public boolean isValid(String card) { |
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129 | if ((card == null) || (card.length() < 13) || (card.length() > 19)) { |
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130 | return false; |
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131 | } |
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132 | ||
133 | if (!this.luhnCheck(card)) { |
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134 | return false; |
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135 | } |
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136 | ||
137 | Iterator types = this.cardTypes.iterator(); |
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138 | while (types.hasNext()) { |
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139 | CreditCardType type = (CreditCardType) types.next(); |
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140 | if (type.matches(card)) { |
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141 | return true; |
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142 | } |
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143 | } |
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144 | ||
145 | return false; |
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146 | } |
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147 | ||
148 | /** |
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149 | * Add an allowed CreditCardType that participates in the card |
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150 | * validation algorithm. |
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151 | * @param type The type that is now allowed to pass validation. |
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152 | * @since Validator 1.1.2 |
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153 | */ |
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154 | public void addAllowedCardType(CreditCardType type){ |
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155 | this.cardTypes.add(type); |
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156 | } |
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157 | ||
158 | /** |
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159 | * Checks for a valid credit card number. |
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160 | * @param cardNumber Credit Card Number. |
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161 | * @return Whether the card number passes the luhnCheck. |
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162 | */ |
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163 | protected boolean luhnCheck(String cardNumber) { |
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164 | // number must be validated as 0..9 numeric first!! |
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165 | int digits = cardNumber.length(); |
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166 | int oddOrEven = digits & 1; |
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167 | long sum = 0; |
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168 | for (int count = 0; count < digits; count++) { |
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169 | int digit = 0; |
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170 | try { |
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171 | digit = Integer.parseInt(cardNumber.charAt(count) + ""); |
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172 | } catch(NumberFormatException e) { |
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173 | return false; |
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174 | } |
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175 | ||
176 | if (((count & 1) ^ oddOrEven) == 0) { // not |
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177 | digit *= 2; |
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178 | if (digit > 9) { |
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179 | digit -= 9; |
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180 | } |
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181 | } |
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182 | sum += digit; |
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183 | } |
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184 | ||
185 | return (sum == 0) ? false : (sum % 10 == 0); |
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186 | } |
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187 | ||
188 | /** |
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189 | * CreditCardType implementations define how validation is performed |
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190 | * for one type/brand of credit card. |
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191 | * @since Validator 1.1.2 |
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192 | */ |
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193 | public interface CreditCardType { |
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194 | ||
195 | /** |
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196 | * Returns true if the card number matches this type of credit |
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197 | * card. Note that this method is <strong>not</strong> responsible |
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198 | * for analyzing the general form of the card number because |
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199 | * <code>CreditCardValidator</code> performs those checks before |
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200 | * calling this method. It is generally only required to valid the |
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201 | * length and prefix of the number to determine if it's the correct |
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202 | * type. |
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203 | * @param card The card number, never null. |
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204 | * @return true if the number matches. |
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205 | */ |
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206 | boolean matches(String card); |
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207 | ||
208 | } |
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209 | ||
210 | /** |
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211 | * Change to support Visa Carte Blue used in France |
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212 | * has been removed - see Bug 35926 |
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213 | */ |
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214 | private class Visa implements CreditCardType { |
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215 | private static final String PREFIX = "4"; |
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216 | public boolean matches(String card) { |
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217 | return ( |
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218 | card.substring(0, 1).equals(PREFIX) |
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219 | && (card.length() == 13 || card.length() == 16)); |
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220 | } |
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221 | } |
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222 | ||
223 | private class Amex implements CreditCardType { |
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224 | private static final String PREFIX = "34,37,"; |
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225 | public boolean matches(String card) { |
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226 | String prefix2 = card.substring(0, 2) + ","; |
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227 | return ((PREFIX.indexOf(prefix2) != -1) && (card.length() == 15)); |
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228 | } |
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229 | } |
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230 | ||
231 | 32 | private class Discover implements CreditCardType { |
232 | private static final String PREFIX = "6011"; |
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233 | public boolean matches(String card) { |
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234 | 1 | return (card.substring(0, 4).equals(PREFIX) && (card.length() == 16)); |
235 | } |
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236 | } |
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237 | ||
238 | private class Mastercard implements CreditCardType { |
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239 | private static final String PREFIX = "51,52,53,54,55,"; |
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240 | public boolean matches(String card) { |
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241 | String prefix2 = card.substring(0, 2) + ","; |
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242 | return ((PREFIX.indexOf(prefix2) != -1) && (card.length() == 16)); |
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243 | } |
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244 | } |
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245 | ||
246 | } |
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