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