/**
* Validates a supplied nut
*
* @param string $nut
* @param string $signingKey The key used to sign the current request
*
* @return int One of the nut class constants
*/
public function validateNut($nut, $signingKey = null)
{
$nutInfo = $this->store->getNutDetails($nut);
if (!is_array($nutInfo)) {
return self::INVALID_NUT;
} elseif ($nutInfo['createdDate']->format('U') < strtotime('-' . $this->configuration->getNonceMaxAge() . ' minutes')) {
return self::EXPIRED_NUT;
} elseif (!is_null($signingKey) && !empty($nutInfo['originalKey']) && $nutInfo['originalKey'] !== $signingKey) {
return self::KEY_MISMATCH;
} else {
return self::VALID_NUT;
}
}
