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LuhnValidator.php
52 lines
| 1 | <?php |
| 2 | namespace MailPoetVendor\Symfony\Component\Validator\Constraints; |
| 3 | if (!defined('ABSPATH')) exit; |
| 4 | use MailPoetVendor\Symfony\Component\Validator\Constraint; |
| 5 | use MailPoetVendor\Symfony\Component\Validator\ConstraintValidator; |
| 6 | use MailPoetVendor\Symfony\Component\Validator\Exception\UnexpectedTypeException; |
| 7 | use MailPoetVendor\Symfony\Component\Validator\Exception\UnexpectedValueException; |
| 8 | class LuhnValidator extends ConstraintValidator |
| 9 | { |
| 10 | public function validate($value, Constraint $constraint) |
| 11 | { |
| 12 | if (!$constraint instanceof Luhn) { |
| 13 | throw new UnexpectedTypeException($constraint, Luhn::class); |
| 14 | } |
| 15 | if (null === $value || '' === $value) { |
| 16 | return; |
| 17 | } |
| 18 | // Work with strings only, because long numbers are represented as floats |
| 19 | // internally and don't work with strlen() |
| 20 | if (!\is_string($value) && !(\is_object($value) && \method_exists($value, '__toString'))) { |
| 21 | throw new UnexpectedValueException($value, 'string'); |
| 22 | } |
| 23 | $value = (string) $value; |
| 24 | if (!\ctype_digit($value)) { |
| 25 | $this->context->buildViolation($constraint->message)->setParameter('{{ value }}', $this->formatValue($value))->setCode(Luhn::INVALID_CHARACTERS_ERROR)->addViolation(); |
| 26 | return; |
| 27 | } |
| 28 | $checkSum = 0; |
| 29 | $length = \strlen($value); |
| 30 | // Starting with the last digit and walking left, add every second |
| 31 | // digit to the check sum |
| 32 | // e.g. 7 9 9 2 7 3 9 8 7 1 3 |
| 33 | // ^ ^ ^ ^ ^ ^ |
| 34 | // = 7 + 9 + 7 + 9 + 7 + 3 |
| 35 | for ($i = $length - 1; $i >= 0; $i -= 2) { |
| 36 | $checkSum += $value[$i]; |
| 37 | } |
| 38 | // Starting with the second last digit and walking left, double every |
| 39 | // second digit and add it to the check sum |
| 40 | // For doubles greater than 9, sum the individual digits |
| 41 | // e.g. 7 9 9 2 7 3 9 8 7 1 3 |
| 42 | // ^ ^ ^ ^ ^ |
| 43 | // = 1+8 + 4 + 6 + 1+6 + 2 |
| 44 | for ($i = $length - 2; $i >= 0; $i -= 2) { |
| 45 | $checkSum += \array_sum(\str_split((int) $value[$i] * 2)); |
| 46 | } |
| 47 | if (0 === $checkSum || 0 !== $checkSum % 10) { |
| 48 | $this->context->buildViolation($constraint->message)->setParameter('{{ value }}', $this->formatValue($value))->setCode(Luhn::CHECKSUM_FAILED_ERROR)->addViolation(); |
| 49 | } |
| 50 | } |
| 51 | } |
| 52 |