Rocket.Chat/app/federation/server/hooks/afterSetReaction.js

import _ from 'underscore';

import { FederationRoomEvents, Rooms } from '../../../models/server';
import { logger } from '../lib/logger';
import { hasExternalDomain } from '../functions/helpers';
import { getFederationDomain } from '../lib/getFederationDomain';
import { dispatchEvent } from '../handler';

async function afterSetReaction(message, { user, reaction }) {
	const room = Rooms.findOneById(message.rid, { fields: { federation: 1 } });

	// If there are not federated users on this room, ignore it
	if (!hasExternalDomain(room)) { return message; }

	logger.client.debug(() => `afterSetReaction => message=${ JSON.stringify(_.pick(message, '_id', 'msg'), null, 2) } room=${ JSON.stringify(_.pick(room, '_id'), null, 2) } user=${ JSON.stringify(_.pick(user, 'username'), null, 2) } reaction=${ reaction }`);

	// Create the event
	const event = await FederationRoomEvents.createSetMessageReactionEvent(getFederationDomain(), room._id, message._id, user.username, reaction);

	// Dispatch event (async)
	dispatchEvent(room.federation.domains, event);

	return message;
}

export const definition = {
	hook: 'afterSetReaction',
	callback: (message, extras) => Promise.await(afterSetReaction(message, extras)),
	id: 'federation-after-set-reaction',
};