Rocket.Chat/app/lib/server/functions/attachMessage.js

import { getUserAvatarURL } from '../../../utils/lib/getUserAvatarURL';
import { roomCoordinator } from '../../../../server/lib/rooms/roomCoordinator';

export const attachMessage = function (message, room) {
	const {
		msg,
		u: { username },
		ts,
		attachments,
		_id,
	} = message;
	return {
		text: msg,
		author_name: username,
		author_icon: getUserAvatarURL(username),
		message_link: `${roomCoordinator.getRouteLink(room.t, room)}?msg=${_id}`,
		attachments,
		ts,
	};
};