Kuma/server/notification-providers/telegram.js

const NotificationProvider = require("./notification-provider");
const axios = require("axios");
const { Liquid } = require("liquidjs");

class Telegram extends NotificationProvider {
    name = "telegram";

    /**
     * @inheritdoc
     */
    async send(notification, msg, monitorJSON = null, heartbeatJSON = null) {
        const okMsg = "Sent Successfully.";
        const url = "https://api.telegram.org";

        try {
            let params = {
                chat_id: notification.telegramChatID,
                text: msg,
                disable_notification: notification.telegramSendSilently ?? false,
                protect_content: notification.telegramProtectContent ?? false,
            };
            if (notification.telegramMessageThreadID) {
                params.message_thread_id = notification.telegramMessageThreadID;
            }

            if (notification.telegramUseTemplate) {
                const engine = new Liquid();
                const tpl = engine.parse(notification.telegramTemplate);

                params.text = await engine.render(
                    tpl,
                    {
                        msg,
                        heartbeatJSON,
                        monitorJSON
                    }
                );

                if (notification.telegramTemplateParseMode !== "plain") {
                    params.parse_mode = notification.telegramTemplateParseMode;
                }
            }

            await axios.get(`${url}/bot${notification.telegramBotToken}/sendMessage`, {
                params: params,
            });
            return okMsg;

        } catch (error) {
            this.throwGeneralAxiosError(error);
        }
    }
}

module.exports = Telegram;