@catho/request-public-ip/dist/esm/get-client-public-ip.mjs

Node.js module for retrieving a request's public IP address

import { isPublicIp } from './is-public-ip.mjs';

function getClientPublicIpFromHeaders(headers) {
    // Used by Amazon EC2, Heroku, and others.
    if (isPublicIp(headers["x-client-ip"])) {
        return headers["x-client-ip"];
    }
    // Used by Load-balancers (AWS ELB) or proxies.
    const xForwardedFor = getClientPublicIpFromXForwardedFor(headers["x-forwarded-for"]);
    if (xForwardedFor) {
        return xForwardedFor;
    }
    // Used by Akamai and Cloudflare
    if (isPublicIp(headers["true-client-ip"])) {
        return headers["true-client-ip"];
    }
    // Used by nginx proxy/fcgi; alternative to x-forwarded-for
    if (isPublicIp(headers["x-real-ip"])) {
        return headers["x-real-ip"];
    }
}
function getClientPublicIpFromXForwardedFor(input) {
    if (!input)
        return;
    const ips = Array.isArray(input) ? input : input.split(",");
    for (let i = 0; i < ips.length; i++) {
        const ip = ips[i].trim();
        if (isPublicIp(ip)) {
            return ip;
        }
    }
}

export { getClientPublicIpFromHeaders, getClientPublicIpFromXForwardedFor };