User::getReplyTo

static function getReplyTo($siteId, $userId, $entityType, $entityId, $entityLink = null, $backurl = null)
{
	$filter = array(
		'=SITE_ID'     => $siteId,
		'=USER_ID'     => $userId,
		'=ENTITY_TYPE' => $entityType,
		'=ENTITY_ID'   => $entityId
	);
	$userRelation = UserRelationsTable::getList(array('filter' => $filter))->fetch();

	if (empty($userRelation))
	{
		$filter['=SITE_ID'] = null;
		$userRelation = UserRelationsTable::getList(array('filter' => $filter))->fetch();
	}

	if (empty($userRelation))
	{
		if (empty($entityLink))
			return false;

		$userRelation = array(
			'SITE_ID'     => $siteId,
			'TOKEN'       => base_convert(md5(time().MainSecurityRandom::getBytes(6)), 16, 36),
			'USER_ID'     => $userId,
			'ENTITY_TYPE' => $entityType,
			'ENTITY_ID'   => $entityId,
			'ENTITY_LINK' => $entityLink,
			'BACKURL'     => $backurl
		);

		if (!UserRelationsTable::add($userRelation)->isSuccess())
			return false;
	}

	$site    = MainSiteTable::getByPrimary($siteId)->fetch();
	$context = MainApplication::getInstance()->getContext();

	$scheme = $context->getRequest()->isHttps() ? 'https' : 'http';
	$domain = $site['SERVER_NAME'] ?: COption::getOptionString('main', 'server_name', '');

	if (preg_match('/^(?.+):(?d+)$/', $domain, $matches))
	{
		$domain = $matches['domain'];
		$port   = $matches['port'];
	}
	else
	{
		$port = $context->getServer()->getServerPort();
	}

	$port = in_array($port, array(80, 443)) ? '' : ':'.$port;
	$path = ltrim(trim($site['DIR'], '/') . '/pub/entry.php', '/');

	$replyTo = sprintf('rpl%s@%s', $userRelation['TOKEN'], $domain);
	$backUrl = sprintf('%s://%s%s/%s#%s', $scheme, $domain, $port, $path, $userRelation['TOKEN']);

	return array($replyTo, $backUrl);
}