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<?php
declare(strict_types=1);
namespace Application\Api\Scalar;
use GraphQL\Language\AST\StringValueNode;
/**
* Represent an email address
*
* This exceptionally accept empty string as null because email address are often unique
* in DB and thus can never be empty string to indicate absence of email. So we simplify
* the client work by accepting empty string and transparently transforming into a null value.
*/
class EmailType extends AbstractStringBasedType
{
* Validate a email
* @param mixed $value
* @return bool
protected function isValid($value): bool
return $value === null || (is_string($value) && filter_var($value, FILTER_VALIDATE_EMAIL));
}
public function serialize($value)
if ($value === '') {
return null;
return parent::serialize($value);
public function parseValue($value)
return parent::parseValue($value);
public function parseLiteral($ast, array $variables = null)
if ($ast instanceof StringValueNode && $ast->value === '') {
return parent::parseLiteral($ast, $variables);
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