CertificateId.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\Certificate\ValueObject;
 
use InvalidArgumentException;
 
class CertificateId
{
    private const UUID_LENGTH = 36;
    private const UUID_SEPARATOR_COUNT = 4;
 
    private readonly string $certificate_id;
 
    public function __construct(string $certificate_id)
    {
        if ($certificate_id === '') {
            throw new InvalidArgumentException('certificate_id cannot be empty.');
        }
 
        if (strlen($certificate_id) !== self::UUID_LENGTH) {
            throw new InvalidArgumentException(sprintf(
                'certificate_id must be a valid UUID. UUID must be %s characters long.',
                self::UUID_LENGTH
            ));
        }
 
        if (substr_count($certificate_id, '-') !== 4) {
            throw new InvalidArgumentException(sprintf(
                'certificate_id must be a valid UUID. UUID must contain %s "-" characters.',
                self::UUID_SEPARATOR_COUNT
            ));
        }
        $this->certificate_id = $certificate_id;
    }
 
    public function asString(): string
    {
        return $this->certificate_id;
    }
}