CCalendarEvent::ApplyAccessRestrictions

static function ApplyAccessRestrictions($event, $userId = false)
{
	$sectId = $event['SECT_ID'];
	if (empty($event['ACCESSIBILITY']))
	{
		$event['ACCESSIBILITY'] = 'busy';
	}

	$private = !empty($event['PRIVATE_EVENT']) && ($event['CAL_TYPE'] ?? null) === 'user';
	$isAttendee = false;

	if (is_array($event['ATTENDEE_LIST'] ?? null))
	{
		foreach($event['ATTENDEE_LIST'] as $attendee)
		{
			if ((int)$attendee['id'] === (int)$userId)
			{
				$isAttendee = true;
				break;
			}
		}
	}

	if (!$userId)
	{
		$userId = CCalendar::GetUserId();
	}


	if (
            ($event['CAL_TYPE'] ?? null) === 'user'
		&& !empty($event['IS_MEETING'])
		&& (int)$event['OWNER_ID'] !== (int)$userId
	)
	{
		if ($isAttendee)
		{
			$sectId = CCalendar::GetMeetingSection($userId);
		}
		elseif (
			isset($event['USER_MEETING']['ATTENDEE_ID'])
			&& $event['USER_MEETING']['ATTENDEE_ID'] !== $userId
		)
		{
			$sectId = CCalendar::GetMeetingSection($event['USER_MEETING']['ATTENDEE_ID']);
			$event['SECT_ID'] = $sectId;
			$event['OWNER_ID'] = $event['USER_MEETING']['ATTENDEE_ID'];
		}
	}

	$accessController = new EventAccessController($userId);
	$eventModel = self::getEventModelForPermissionCheck((int)($event['ID'] ?? 0), $event, $userId);
	$eventModel->setSectionId((int)$sectId);
	$request = [
		ActionDictionary::ACTION_EVENT_VIEW_FULL => [],
		ActionDictionary::ACTION_EVENT_VIEW_TIME => [],
		ActionDictionary::ACTION_EVENT_VIEW_TITLE => [],
	];
	$accessResult = $accessController->batchCheck($request, $eventModel);

	if ($private || (!$accessResult[ActionDictionary::ACTION_EVENT_VIEW_FULL] && !$isAttendee))
	{
		if ($private)
		{
			$event['NAME'] = '['.GetMessage('EC_ACCESSIBILITY_'.mb_strtoupper($event['ACCESSIBILITY'])).']';
			$event['IS_ACCESSIBLE_TO_USER'] = false;
			if (!$accessResult[ActionDictionary::ACTION_EVENT_VIEW_TIME])
			{
				return false;
			}
		}
		else if (!$accessResult[ActionDictionary::ACTION_EVENT_VIEW_TITLE])
		{
			if ($accessResult[ActionDictionary::ACTION_EVENT_VIEW_TIME])
			{
				$event['NAME'] = '['.GetMessage('EC_ACCESSIBILITY_'.mb_strtoupper($event['ACCESSIBILITY'])).']';
				$event['IS_ACCESSIBLE_TO_USER'] = false;
			}
			else
			{
				return false;
			}
		}
		else
		{
			$event['NAME'] .= ' ['.GetMessage('EC_ACCESSIBILITY_'.mb_strtoupper($event['ACCESSIBILITY'])).']';
		}

		// Clear information about
		unset(
			$event['DESCRIPTION'],
			$event['LOCATION'],
			$event['REMIND'],
			$event['USER_MEETING'],
			$event['ATTENDEE_LIST'],
			$event['ATTENDEES_CODES'],
                $event['UF_CRM_CAL_EVENT'],
                $event['UF_WEBDAV_CAL_EVENT'],
		);
	}

	return $event;
}