Rocket.Chat/apps/meteor/ee/server/api/chat.ts

import { Meteor } from 'meteor/meteor';

import { API } from '../../../app/api/server/api';
import { hasLicense } from '../../app/license/server/license';

API.v1.addRoute(
	'chat.getMessageReadReceipts',
	{ authRequired: true },
	{
		async get() {
			if (!hasLicense('message-read-receipt')) {
				throw new Meteor.Error('error-action-not-allowed', 'This is an enterprise feature');
			}

			const { messageId } = this.queryParams;
			if (!messageId) {
				return API.v1.failure({
					error: "The required 'messageId' param is missing.",
				});
			}

			return API.v1.success({
				receipts: await Meteor.callAsync('getReadReceipts', { messageId }),
			});
		},
	},
);