97 lines
3.2 KiB
PHP
97 lines
3.2 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Validator\Constraints;
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use Symfony\Component\Validator\Constraint;
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use Symfony\Component\Validator\ConstraintValidator;
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use Symfony\Component\Validator\Exception\UnexpectedTypeException;
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use Symfony\Component\Validator\Exception\UnexpectedValueException;
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/**
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* Validates a PAN using the LUHN Algorithm.
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*
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* For a list of example card numbers that are used to test this
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* class, please see the LuhnValidatorTest class.
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*
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* @see http://en.wikipedia.org/wiki/Luhn_algorithm
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*
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* @author Tim Nagel <t.nagel@infinite.net.au>
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* @author Greg Knapp http://gregk.me/2011/php-implementation-of-bank-card-luhn-algorithm/
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* @author Bernhard Schussek <bschussek@gmail.com>
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*/
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class LuhnValidator extends ConstraintValidator
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{
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/**
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* Validates a credit card number with the Luhn algorithm.
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*
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* @param mixed $value
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*
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* @throws UnexpectedTypeException when the given credit card number is no string
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*/
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public function validate($value, Constraint $constraint)
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{
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if (!$constraint instanceof Luhn) {
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throw new UnexpectedTypeException($constraint, Luhn::class);
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}
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if (null === $value || '' === $value) {
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return;
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}
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// Work with strings only, because long numbers are represented as floats
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// internally and don't work with strlen()
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if (!\is_string($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
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throw new UnexpectedValueException($value, 'string');
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}
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$value = (string) $value;
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if (!ctype_digit($value)) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Luhn::INVALID_CHARACTERS_ERROR)
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->addViolation();
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return;
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}
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$checkSum = 0;
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$length = \strlen($value);
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// Starting with the last digit and walking left, add every second
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// digit to the check sum
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// e.g. 7 9 9 2 7 3 9 8 7 1 3
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// ^ ^ ^ ^ ^ ^
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// = 7 + 9 + 7 + 9 + 7 + 3
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for ($i = $length - 1; $i >= 0; $i -= 2) {
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$checkSum += $value[$i];
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}
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// Starting with the second last digit and walking left, double every
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// second digit and add it to the check sum
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// For doubles greater than 9, sum the individual digits
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// e.g. 7 9 9 2 7 3 9 8 7 1 3
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// ^ ^ ^ ^ ^
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// = 1+8 + 4 + 6 + 1+6 + 2
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for ($i = $length - 2; $i >= 0; $i -= 2) {
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$checkSum += array_sum(str_split((int) $value[$i] * 2));
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}
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if (0 === $checkSum || 0 !== $checkSum % 10) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Luhn::CHECKSUM_FAILED_ERROR)
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->addViolation();
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}
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}
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}
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