CIMRestService::chatTaskPrepare

static function chatTaskPrepare($arParams, $n, CRestServer $server)
{
	$arParams = array_change_key_case($arParams, CASE_UPPER);
	if ($server->getAuthType() !== BitrixRestSessionAuthAuth::AUTH_TYPE && !self::isDebugEnabled())
	{
		throw new BitrixRestRestException('This method is available only with session auth type', 'WRONG_AUTH_TYPE', CRestServer::STATUS_WRONG_REQUEST);
	}

	$message = null;
	$messageId = null;

	if (isset($arParams['MESSAGE_ID']) && (int)$arParams['MESSAGE_ID'] > 0)
	{
		$messageId = (int)$arParams['MESSAGE_ID'];

		$message = new BitrixImV2Message($messageId);

		if ($message->getMessageId() === null)
		{
			throw new BitrixRestRestException('Message not found', BitrixImV2MessageMessageError::MESSAGE_NOT_FOUND, CRestServer::STATUS_WRONG_REQUEST);
		}

		$chat = $message->getChat();
	}
	elseif (isset($arParams['CHAT_ID']) && (int)$arParams['CHAT_ID'] > 0)
	{
		$chatId = (int)$arParams['CHAT_ID'];

		$chat = BitrixImV2Chat::getInstance($chatId);
	}
	else
	{
		throw new BitrixRestRestException('Message ID and chat ID can`t be empty together', 'CHAT_ID_MESSAGE_ID_EMPTY', CRestServer::STATUS_WRONG_REQUEST);
	}

	if (!$chat->hasAccess())
	{
		throw new BitrixRestRestException('You do not have access to this chat', BitrixImV2RestRestError::ACCESS_ERROR, CRestServer::STATUS_FORBIDDEN);
	}

	if (isset($messageId) && $messageId < $chat->getStartId())
	{
		throw new BitrixRestRestException('You do not have access to this message', BitrixImV2MessageMessageError::MESSAGE_ACCESS_ERROR, CRestServer::STATUS_FORBIDDEN);
	}

	$taskService = new BitrixImV2LinkTaskTaskService();
	$result = $taskService->prepareDataForCreateSlider($chat, $message);
	if (!$result->isSuccess())
	{
		$error = $result->getErrors()[0];
		if (isset($error))
		{
			throw new BitrixRestRestException($error->getMessage(), $error->getCode(), CRestServer::STATUS_WRONG_REQUEST);
		}
	}

	$data = $result->getResult();

	return [
		'link' => $data['LINK'],
		'params' => $data['PARAMS']
	];
}