the-guard-bot/utils/tg.js

'use strict';

const { telegram } = require('../bot');

const { promisify } = require('util');

const delay = promisify(setTimeout);

const escapeHtml = s => s
	.replace(/</g, '&lt;');

const link = ({ id, first_name }) =>
	`<a href="tg://user?id=${id}">${escapeHtml(first_name)}</a>`;

const quietLink = (user) =>
	user.username
		? `<a href="t.me/${user.username}">${escapeHtml(user.first_name)}</a>`
		: link(user);

/**
 * @param {number} ms
 * Deletes messages after (ms) milliseconds
 * @returns {undefined}
 */
const deleteAfter = ms => ctx =>
	setTimeout(
		() =>
			ctx.telegram.deleteMessage(ctx.chat.id, ctx.message.message_id),
		ms
	);

const scheduleDeletion = async ({ chat, message_id }) => {
	if (chat.type === 'private') {
		return null;
	}
	await delay(5 * 60 * 1000);
	return telegram.deleteMessage(chat.id, message_id);
};

module.exports = {
	deleteAfter,
	escapeHtml,
	link,
	quietLink,
	scheduleDeletion,
};