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Apache Commons Validator provides the building blocks for both client side validation and server side data validation.
It may be used standalone or with a framework like Struts.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.validator;
import java.util.ArrayList;
import java.util.Collection;
import org.apache.commons.validator.util.Flags;
/**
* Perform credit card validations.
*
*
* By default, all supported card types are allowed. You can specify which
* cards should pass validation by configuring the validation options. For
* example,
*
*
*
* CreditCardValidator ccv = new CreditCardValidator(CreditCardValidator.AMEX + CreditCardValidator.VISA);
*
*
*
* configures the validator to only pass American Express and Visa cards.
* If a card type is not directly supported by this class, you can implement
* the CreditCardType interface and pass an instance into the
* addAllowedCardType method.
*
*
*
* For a similar implementation in Perl, reference Sean M. Burke's
* script.
* More information is also available
* here.
*
*
* @version $Revision: 1739358 $
* @since Validator 1.1
* @deprecated Use the new CreditCardValidator in the routines package. This class
* will be removed in a future release.
*/
// CHECKSTYLE:OFF (deprecated code)
@Deprecated
public class CreditCardValidator {
/**
* Option specifying that no cards are allowed. This is useful if
* you want only custom card types to validate so you turn off the
* default cards with this option.
*
*
* CreditCardValidator v = new CreditCardValidator(CreditCardValidator.NONE);
* v.addAllowedCardType(customType);
* v.isValid(aCardNumber);
*
*
* @since Validator 1.1.2
*/
public static final int NONE = 0;
/**
* Option specifying that American Express cards are allowed.
*/
public static final int AMEX = 1 << 0;
/**
* Option specifying that Visa cards are allowed.
*/
public static final int VISA = 1 << 1;
/**
* Option specifying that Mastercard cards are allowed.
*/
public static final int MASTERCARD = 1 << 2;
/**
* Option specifying that Discover cards are allowed.
*/
public static final int DISCOVER = 1 << 3;
/**
* The CreditCardTypes that are allowed to pass validation.
*/
private final Collection cardTypes = new ArrayList();
/**
* Create a new CreditCardValidator with default options.
*/
public CreditCardValidator() {
this(AMEX + VISA + MASTERCARD + DISCOVER);
}
/**
* Creates a new CreditCardValidator with the specified options.
* @param options Pass in
* CreditCardValidator.VISA + CreditCardValidator.AMEX to specify that
* those are the only valid card types.
*/
public CreditCardValidator(int options) {
super();
Flags f = new Flags(options);
if (f.isOn(VISA)) {
this.cardTypes.add(new Visa());
}
if (f.isOn(AMEX)) {
this.cardTypes.add(new Amex());
}
if (f.isOn(MASTERCARD)) {
this.cardTypes.add(new Mastercard());
}
if (f.isOn(DISCOVER)) {
this.cardTypes.add(new Discover());
}
}
/**
* Checks if the field is a valid credit card number.
* @param card The card number to validate.
* @return Whether the card number is valid.
*/
public boolean isValid(String card) {
if ((card == null) || (card.length() < 13) || (card.length() > 19)) {
return false;
}
if (!this.luhnCheck(card)) {
return false;
}
for (Object cardType : this.cardTypes) {
CreditCardType type = (CreditCardType) cardType;
if (type.matches(card)) {
return true;
}
}
return false;
}
/**
* Adds an allowed CreditCardType that participates in the card
* validation algorithm.
* @param type The type that is now allowed to pass validation.
* @since Validator 1.1.2
*/
public void addAllowedCardType(CreditCardType type){
this.cardTypes.add(type);
}
/**
* Checks for a valid credit card number.
* @param cardNumber Credit Card Number.
* @return Whether the card number passes the luhnCheck.
*/
protected boolean luhnCheck(String cardNumber) {
// number must be validated as 0..9 numeric first!!
int digits = cardNumber.length();
int oddOrEven = digits & 1;
long sum = 0;
for (int count = 0; count < digits; count++) {
int digit = 0;
try {
digit = Integer.parseInt(cardNumber.charAt(count) + "");
} catch(NumberFormatException e) {
return false;
}
if (((count & 1) ^ oddOrEven) == 0) { // not
digit *= 2;
if (digit > 9) {
digit -= 9;
}
}
sum += digit;
}
return (sum == 0) ? false : (sum % 10 == 0);
}
/**
* CreditCardType implementations define how validation is performed
* for one type/brand of credit card.
* @since Validator 1.1.2
*/
public interface CreditCardType {
/**
* Returns true if the card number matches this type of credit
* card. Note that this method is not responsible
* for analyzing the general form of the card number because
* CreditCardValidator performs those checks before
* calling this method. It is generally only required to valid the
* length and prefix of the number to determine if it's the correct
* type.
* @param card The card number, never null.
* @return true if the number matches.
*/
boolean matches(String card);
}
/**
* Change to support Visa Carte Blue used in France
* has been removed - see Bug 35926
*/
private static class Visa implements CreditCardType {
private static final String PREFIX = "4";
@Override
public boolean matches(String card) {
return (
card.substring(0, 1).equals(PREFIX)
&& (card.length() == 13 || card.length() == 16));
}
}
private static class Amex implements CreditCardType {
private static final String PREFIX = "34,37,";
@Override
public boolean matches(String card) {
String prefix2 = card.substring(0, 2) + ",";
return ((PREFIX.contains(prefix2)) && (card.length() == 15));
}
}
private static class Discover implements CreditCardType {
private static final String PREFIX = "6011";
@Override
public boolean matches(String card) {
return (card.substring(0, 4).equals(PREFIX) && (card.length() == 16));
}
}
private static class Mastercard implements CreditCardType {
private static final String PREFIX = "51,52,53,54,55,";
@Override
public boolean matches(String card) {
String prefix2 = card.substring(0, 2) + ",";
return ((PREFIX.contains(prefix2)) && (card.length() == 16));
}
}
}