class.ilGroupNameAsMailValidator.php

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<?php

declare(strict_types=1);

class ilGroupNameAsMailValidator
{
    protected $group_name_check_callable;

    public function __construct(protected string $host, ?callable $group_name_check_callable = null)
    {
        $this->group_name_check_callable = $group_name_check_callable ?? static fn(string $group_name): bool => ilUtil::groupNameExists($group_name);
    }

    public function validate(ilMailAddress $address): bool
    {
        $group_name = substr($address->getMailbox(), 1);

        $func = $this->group_name_check_callable;
        return $func($group_name) && $this->isHostValid($address->getHost());
    }

    private function isHostValid(string $host): bool
    {
        return ($host === $this->host || $host === '');
    }
}