@designerstrust/remix-utils/browser/server/get-client-ip-address.js

This package contains simple utility functions to use with [Remix.run](https://remix.run).

import isIP from "is-ip";
import { getHeaders } from "./get-headers";
/**
 * This is the list of headers, in order of preference, that will be used to
 * determine the client's IP address.
 */
const headerNames = Object.freeze([
    "X-Client-IP",
    "X-Forwarded-For",
    "Fly-Client-IP",
    "CF-Connecting-IP",
    "Fastly-Client-Ip",
    "True-Client-Ip",
    "X-Real-IP",
    "X-Cluster-Client-IP",
    "X-Forwarded",
    "Forwarded-For",
    "Forwarded",
    "DO-Connecting-IP" /** Digital ocean app platform */,
]);
export function getClientIPAddress(requestOrHeaders) {
    let headers = getHeaders(requestOrHeaders);
    let ipAddress = headerNames
        .flatMap((headerName) => {
        let value = headers.get(headerName);
        if (headerName === "Forwarded") {
            return parseForwardedHeader(value);
        }
        if (!(value === null || value === void 0 ? void 0 : value.includes(",")))
            return value;
        return value.split(",").map((ip) => ip.trim());
    })
        .find((ip) => {
        if (ip === null)
            return false;
        return isIP(ip);
    });
    return ipAddress !== null && ipAddress !== void 0 ? ipAddress : null;
}
function parseForwardedHeader(value) {
    if (!value)
        return null;
    for (let part of value.split(";")) {
        if (part.startsWith("for="))
            return part.slice(4);
        continue;
    }
    return null;
}