Domain::check

static function check($domain, array $filter = [])
{
	$result = new PublicActionResult();

	if (!is_string($domain))
	{
		return $result;
	}

	$puny = new CBXPunycode;
	$domainOrig = $domain;
	$domain = $puny->encode(trim($domain));
	$tld = DomainCore::getTLD($domain);
	$return = [
		'available' => true,
		'deleted' => false,
		'errors' => null,
		'domain' => $domain,
		'length' => [
			'length' => mb_strlen($domain),
			'limit' => self::DOMAIN_MAX_LENGTH,
		],
		'tld' => $tld,
		'dns' => Register::getDNSRecords($tld)
	];

	// check domain name restrictions
	if (mb_strlen($domain) > self::DOMAIN_MAX_LENGTH)
	{
		$return['errors']['wrongLength'] = true;
	}
	if (!preg_match(self::DOMAIN_SYMBOLS_REGEXP, $domain))
	{
		$return['errors']['wrongSymbols'] = true;
	}
	if (preg_match(self::DOMAIN_WRONG_SYMBOLS_REGEXP, $domainOrig))
	{
		$return['errors']['wrongSymbolCombination'] = true;
	}
	if (strpos($domain, '.') === false)
	{
		$return['errors']['wrongDomainLevel'] = true;
	}
	if (is_array($return['errors']))
	{
		$return['available'] = false;
		$result->setResult($return);

		return $result;
	}

	// additional filter
	if (!is_array($filter))
	{
		$filter = [];
	}
	$filter['=DOMAIN'] = $return['domain'];

	// check domain
	$res = DomainCore::getList([
		'select' => [
			'ID'
		],
		'filter' => $filter
	]);
	$return['available'] = !($domainRow = $res->fetch());

	// check sites in trash
	if (!$return['available'])
	{
		$resSite = Site::getList(array(
			'select' => array(
				'ID'
			),
			'filter' => array(
				'DOMAIN_ID' => $domainRow['ID'],
				'=DELETED' => 'Y',
				'CHECK_PERMISSIONS' => 'N'
			)
		));
		if ($resSite->fetch())
		{
			$return['available'] = false;
			$return['deleted'] = true;
		}
	}

	// external available check
	if (
		$return['available'] &&
		$return['domain'] &&
		Manager::isB24()
	)
	{
		try
		{
			$siteController = Manager::getExternalSiteController();
			if ($siteController)
			{
			 	$checkResult = $siteController::isDomainExists(
					$return['domain']
				);
				$return['available'] = $checkResult < 2;
			}
		}
		catch (SystemException $ex)
		{
		}
	}

	// set result and return
	$result->setResult($return);
	return $result;
}