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

import { Meteor } from 'meteor/meteor';
import { Match, check } from 'meteor/check';

import { hasPermission } from '../../../authorization';
import { LivechatCustomField } from '../../../models';

Meteor.methods({
	'livechat:saveCustomField'(_id, customFieldData) {
		if (!Meteor.userId() || !hasPermission(Meteor.userId(), 'view-livechat-manager')) {
			throw new Meteor.Error('error-not-allowed', 'Not allowed', { method: 'livechat:saveCustomField' });
		}

		if (_id) {
			check(_id, String);
		}

		check(customFieldData, Match.ObjectIncluding({ field: String, label: String, scope: String, visibility: String, regexp: String }));

		if (!/^[0-9a-zA-Z-_]+$/.test(customFieldData.field)) {
			throw new Meteor.Error('error-invalid-custom-field-name', 'Invalid custom field name. Use only letters, numbers, hyphens and underscores.', { method: 'livechat:saveCustomField' });
		}

		if (_id) {
			const customField = LivechatCustomField.findOneById(_id);
			if (!customField) {
				throw new Meteor.Error('error-invalid-custom-field', 'Custom Field Not found', { method: 'livechat:saveCustomField' });
			}
		}

		if (!_id) {
			const customField = LivechatCustomField.findOneById(customFieldData.field);
			if (customField) {
				throw new Meteor.Error('error-custom-field-name-already-exists', 'Custom field name already exists', { method: 'livechat:saveCustomField' });
			}
		}

		const { field, label, scope, visibility, ...extraData } = customFieldData;
		return LivechatCustomField.createOrUpdateCustomField(_id, field, label, scope, visibility, { ...extraData });
	},
});