Rocket.Chat/app/livechat/server/api/lib/transfer.js

import { hasPermissionAsync } from '../../../../authorization/server/functions/hasPermission';
import { Messages } from '../../../../models/server/raw';

const normalizeTransferHistory = ({ transferData }) => transferData;
export async function findLivechatTransferHistory({ userId, rid, pagination: { offset, count, sort } }) {
	if (!await hasPermissionAsync(userId, 'view-livechat-rooms')) {
		throw new Error('error-not-authorized');
	}

	const cursor = await Messages.find({ rid, t: 'livechat_transfer_history' }, {
		fields: { transferData: 1 },
		sort: sort || { ts: 1 },
		skip: offset,
		limit: count,
	});

	const total = await cursor.count();
	const messages = await cursor.toArray();
	const history = messages.map(normalizeTransferHistory);

	return {
		history,
		count: history.length,
		offset,
		total,
	};
}