IbanValidator.php in Plug 7

Namespace

Symfony\Component\Validator\Constraints

File

lib/Symfony/validator/Symfony/Component/Validator/Constraints/IbanValidator.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[e-mail]>
 *
 * 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;

/**
 * @author Manuel Reinhard <[e-mail]>
 * @author Michael Schummel
 * @author Bernhard Schussek <[e-mail]>
 *
 * @link http://www.michael-schummel.de/2007/10/05/iban-prufung-mit-php/
 */
class IbanValidator extends ConstraintValidator {

  /**
   * {@inheritdoc}
   */
  public function validate($value, Constraint $constraint) {
    if (!$constraint instanceof Iban) {
      throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\\Iban');
    }
    if (null === $value || '' === $value) {
      return;
    }
    if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
      throw new UnexpectedTypeException($value, 'string');
    }
    $value = (string) $value;

    // Remove spaces
    $canonicalized = str_replace(' ', '', $value);

    // The IBAN must have at least 4 characters...
    if (strlen($canonicalized) < 4) {
      $this
        ->buildViolation($constraint->message)
        ->setParameter('{{ value }}', $this
        ->formatValue($value))
        ->setCode(Iban::TOO_SHORT_ERROR)
        ->addViolation();
      return;
    }

    // ...start with a country code...
    if (!ctype_alpha($canonicalized[0]) || !ctype_alpha($canonicalized[1])) {
      $this
        ->buildViolation($constraint->message)
        ->setParameter('{{ value }}', $this
        ->formatValue($value))
        ->setCode(Iban::INVALID_COUNTRY_CODE_ERROR)
        ->addViolation();
      return;
    }

    // ...contain only digits and characters...
    if (!ctype_alnum($canonicalized)) {
      $this
        ->buildViolation($constraint->message)
        ->setParameter('{{ value }}', $this
        ->formatValue($value))
        ->setCode(Iban::INVALID_CHARACTERS_ERROR)
        ->addViolation();
      return;
    }

    // ...and contain uppercase characters only
    if ($canonicalized !== strtoupper($canonicalized)) {
      $this
        ->buildViolation($constraint->message)
        ->setParameter('{{ value }}', $this
        ->formatValue($value))
        ->setCode(Iban::INVALID_CASE_ERROR)
        ->addViolation();
      return;
    }

    // Move the first four characters to the end
    // e.g. CH93 0076 2011 6238 5295 7
    //   -> 0076 2011 6238 5295 7 CH93
    $canonicalized = substr($canonicalized, 4) . substr($canonicalized, 0, 4);

    // Convert all remaining letters to their ordinals
    // The result is an integer, which is too large for PHP's int
    // data type, so we store it in a string instead.
    // e.g. 0076 2011 6238 5295 7 CH93
    //   -> 0076 2011 6238 5295 7 121893
    $checkSum = $this
      ->toBigInt($canonicalized);

    // Do a modulo-97 operation on the large integer
    // We cannot use PHP's modulo operator, so we calculate the
    // modulo step-wisely instead
    if (1 !== $this
      ->bigModulo97($checkSum)) {
      $this
        ->buildViolation($constraint->message)
        ->setParameter('{{ value }}', $this
        ->formatValue($value))
        ->setCode(Iban::CHECKSUM_FAILED_ERROR)
        ->addViolation();
    }
  }
  private function toBigInt($string) {
    $chars = str_split($string);
    $bigInt = '';
    foreach ($chars as $char) {

      // Convert uppercase characters to ordinals, starting with 10 for "A"
      if (ctype_upper($char)) {
        $bigInt .= ord($char) - 55;
        continue;
      }

      // Simply append digits
      $bigInt .= $char;
    }
    return $bigInt;
  }
  private function bigModulo97($bigInt) {
    $parts = str_split($bigInt, 7);
    $rest = 0;
    foreach ($parts as $part) {
      $rest = ($rest . $part) % 97;
    }
    return $rest;
  }

}

Classes

Name	Description
IbanValidator	@author Manuel Reinhard <[e-mail]> @author Michael Schummel @author Bernhard Schussek <[e-mail]>