@cch137/format-utils/dist/server/index.js

A collection of utility modules for formatting and processing data

const singleString = (data) => data === undefined ? "" : Array.isArray(data) ? data[0] : data;
const isRequest = (req) => req instanceof Request;
const isNotEmptyString = (data) => typeof data === "string" ? /^\s*$/.test(data) : false;
const trimIps = (ips) => ips.split(",")[0].trim();
export default function getRequestIp(req) {
    const ip = req?.ip;
    if (isNotEmptyString(ip))
        return trimIps(ip);
    if (isRequest(req)) {
        const headers = req.headers;
        return trimIps(headers.get("x-forwarded-for") || headers.get("x-real-ip") || "");
    }
    const headers = req.headers;
    return trimIps(singleString(headers["x-forwarded-for"]) ||
        singleString(headers["x-real-ip"]) ||
        "");
}