import fs from 'fs'
const config = JSON.parse(fs.readFileSync('server_config.json'))
/**
 * gets ip of a request
 * @param {request} req
 * @returns ip of the given request, after taking preferred headers into account
 */
function getIP(req) {
    let ip = req.socket.remoteAddress
    if (
        req.headers[config.preferred_ip_header] !== undefined &&
        ip === config.only_prefer_when_ip
    )
        ip = req.headers[config.preferred_ip_header]
    return ip
}
export default getIP