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<?php /* * This file is part of Respect/Validation. * * (c) Alexandre Gomes Gaigalas <alexandre@gaigalas.net> * * For the full copyright and license information, please view the LICENSE file * that was distributed with this source code. */ declare(strict_types=1); namespace Respect\Validation\Rules; use function is_string; use function mb_strlen; use function preg_match; /** * Validate if a string is Base64-encoded. * * @author Henrique Moody <henriquemoody@gmail.com> * @author Jens Segers <segers.jens@gmail.com> * @author William Espindola <oi@williamespindola.com.br> */ final class Base64 extends AbstractRule { /** * {@inheritDoc} */ public function validate($input): bool { if (!is_string($input)) { return false; } if (!preg_match('#^[A-Za-z0-9+/\n\r]+={0,2}$#', $input)) { return false; } return mb_strlen($input) % 4 === 0; } }