class.ilGroupNameAsMailValidator.php

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<?php

declare(strict_types=1);

class ilGroupNameAsMailValidator
{
    protected $groupNameCheckCallable;

    public function __construct(protected string $host, callable $groupNameCheckCallable = null)
    {
        if (null === $groupNameCheckCallable) {
            $groupNameCheckCallable = static function (string $groupName): bool {
                return ilUtil::groupNameExists($groupName);
            };
        }

        $this->groupNameCheckCallable = $groupNameCheckCallable;
    }

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

        $func = $this->groupNameCheckCallable;
        return $func($groupName) && $this->isHostValid($address->getHost());
    }

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