DefaultNameGenerator.php

<?php


/**
 * This file is part of the ramsey/uuid library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 */
declare (strict_types=1);
namespace Ramsey\Uuid\Generator;

use Ramsey\Uuid\Exception\NameException;
use Ramsey\Uuid\UuidInterface;
use ValueError;
use function hash;

/**
 * DefaultNameGenerator generates strings of binary data based on a namespace,
 * name, and hashing algorithm
 */
class DefaultNameGenerator implements NameGeneratorInterface {
    
    /** @psalm-pure */
    public function generate(UuidInterface $ns, string $name, string $hashAlgorithm) : string {
        try {
            
            /** @var string|bool $bytes */
            $bytes = @hash($hashAlgorithm, $ns->getBytes() . $name, true);
        } catch (ValueError $e) {
            $bytes = false;
            // keep same behavior than PHP 7
        }
        if ($bytes === false) {
            throw new NameException(sprintf('Unable to hash namespace and name with algorithm \'%s\'', $hashAlgorithm));
        }
        return (string) $bytes;
    }

}