fredy/lib/notification/adapter/telegram.js

const TelegramBot = require('tg-yarl');

const opts = { parse_mode: 'Markdown' };

/**
 * sends new listings to telegram
 * @param serviceName e.g immoscout
 * @param newListings an array with newly found listings
 * @param notificationConfig config of this notification adapter
 * * @param jobKey name of the current job that is being executed
 * @returns {Promise<Void> | void}
 */
exports.send = (serviceName, newListings, notificationConfig, jobKey) => {
  const { enabled, token, chatId } = notificationConfig.telegram;
  if (!enabled) {
    return [Promise.resolve()];
  }

  const bot = new TelegramBot(token);

  let message = `Job: ${jobKey} | Service _${serviceName}_ found _${newListings.length}_ new listings:\n\n`;

  message += newListings.map(
    (o) =>
      `*${shorten(o.title.replace(/\*/g, ''), 45)}*\n` +
      [o.address, o.price, o.size].join(' | ') +
      '\n' +
      `[LINK](${o.link})\n\n`
  );

  return bot.sendMessage(chatId, message, opts);
};

function shorten(str, len = 30) {
  return str.length > len ? str.substring(0, len) + '...' : str;
}