Rocket.Chat/app/livechat/server/methods/sendTranscript.js

import { Meteor } from 'meteor/meteor';
import { check } from 'meteor/check';
import { DDPRateLimiter } from 'meteor/ddp-rate-limiter';

import { Users } from '../../../models';
import { hasPermission } from '../../../authorization';
import { Livechat } from '../lib/Livechat';

Meteor.methods({
	'livechat:sendTranscript'(token, rid, email, subject) {
		check(rid, String);
		check(email, String);

		if (!Meteor.userId() || !hasPermission(Meteor.userId(), 'send-omnichannel-chat-transcript')) {
			throw new Meteor.Error('error-not-allowed', 'Not allowed', { method: 'livechat:sendTranscript' });
		}

		const user = Users.findOneById(Meteor.userId(), { fields: { _id: 1, username: 1, name: 1 } });
		return Livechat.sendTranscript({ token, rid, email, subject, user });
	},
});

DDPRateLimiter.addRule({
	type: 'method',
	name: 'livechat:sendTranscript',
	connectionId() {
		return true;
	},
}, 1, 5000);