Ghost/ghost/members-api/lib/services/geolocation.js

const got = require('got');
const IPV4_REGEX = /^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/;
const IPV6_REGEX = /^(?:[A-F0-9]{1,4}:){7}[A-F0-9]{1,4}$/i;

module.exports = class GeolocationService {
    async getGeolocationFromIP(ipAddress) {
        if (!ipAddress || (!IPV4_REGEX.test(ipAddress) && !IPV6_REGEX.test(ipAddress))) {
            return;
        }
        const geojsUrl = `https://get.geojs.io/v1/ip/geo/${encodeURIComponent(ipAddress)}.json`;
        const response = await got(geojsUrl, {timeout: 500}).json();
        return response;
    }
};