RocketChat/Rocket.Chat

import { License } from '@rocket.chat/license';
import { Meteor } from 'meteor/meteor';

import { callbacks } from '../../../lib/callbacks';
import { i18n } from '../../../server/lib/i18n';

callbacks.add(
    'beforeAddedToRoom',
    async ({ user }) => {
        if (user.roles?.includes('guest')) {
            if (await License.shouldPreventAction('roomsPerGuest', 0, { userId: user._id })) {
                throw new Meteor.Error('error-max-rooms-per-guest-reached', i18n.t('error-max-rooms-per-guest-reached'));
            }
        }
    },
    callbacks.priority.MEDIUM,
    'check-max-rooms-per-guest',
);