Download::downloadArchiveAction

public function downloadArchiveAction(int $ownerTypeId, int $ownerId, array $fileIds)
{
	$ownerTypeName = \CCrmOwnerType::ResolveName($ownerTypeId);
	$ownerId = (int)$ownerId;

	if ($ownerId <= 0 || !\CCrmOwnerType::IsDefined($ownerTypeId))
	{
		$this->addError(new Main\Error('Invalid data ownerTypeID = ' . $ownerTypeId . ', ownerID = ' . $ownerId));

		return null;
	}
	if ($ownerTypeId !== \CCrmOwnerType::Activity)
	{
		$this->addError(new Main\Error("The owner type '{$ownerTypeName}' is not supported in current context"));

		return null;
	}

	foreach ($fileIds as $fileId)
	{
		$isFileExists = false;
		switch ($ownerTypeId)
		{
			case \CCrmOwnerType::Activity:
				$isFileExists = \CCrmActivity::CheckStorageElementExists($ownerId, StorageType::Disk, $fileId);
				break;
		}

		if (!$isFileExists)
		{
			$this->addError(new Main\Error('File not found'));

			return null;
		}
	}

	if (!\CCrmPerms::IsAdmin())
	{
		$isPermitted = false;
		$userPermissions = \CCrmPerms::GetCurrentUserPermissions();

		switch ($ownerTypeId)
		{
			case \CCrmOwnerType::Activity:
				$bindings = \CCrmActivity::GetBindings($ownerId);
				break;
			default:
				$bindings = [];
		}

		foreach ($bindings as $binding)
		{
			if (EntityAuthorization::checkReadPermission($binding['OWNER_TYPE_ID'], $binding['OWNER_ID'], $userPermissions))
			{
				$isPermitted = true;
				break;
			}
		}
		if (!$isPermitted)
		{
			$this->addError(new Main\Error('Access denied'));

			return null;
		}
	}

	return DiskManager::buildArchive('archive' . date('y-m-d') . '.zip', $fileIds);
}