get-client-ip/dist/index.cjs

📍 A Lightweight Utility for Extracting the Real Client IP Address from Incoming HTTP Requests

'use strict';

var net = require('net');

// src/index.ts
function $isIP(ip) {
  return typeof ip === "string" && net.isIP(ip) !== 0;
}
var LOOKUP_HEADERS = [
  "x-client-ip",
  "x-forwarded-for",
  "forwarded-for",
  "x-forwarded",
  "x-real-ip",
  "cf-connecting-ip",
  "true-client-ip",
  "x-cluster-client-ip",
  "fastly-client-ip",
  "x-appengine-user-ip",
  "cf-pseudo-ipv4"
];
function $extractIpFromHeaders(req) {
  if ($isIP(req.ip)) return [req.ip];
  if (!req.headers) return null;
  if ($isIP(req.headers.forwarded)) return [req.headers.forwarded];
  for (let i = 0; i < LOOKUP_HEADERS.length; i++) {
    const ip = req.headers[LOOKUP_HEADERS[i]];
    if (!ip) continue;
    if (Array.isArray(ip)) {
      const filteredIps = ip.filter((item) => $isIP(item.trim()));
      if (filteredIps.length > 0) return filteredIps.map((item) => item.trim());
    }
    if (typeof ip === "string") {
      if ($isIP(ip.trim())) return [ip.trim()];
      if (!ip.includes(",")) continue;
      const filteredIps = ip.split(",").filter((ip2) => $isIP(ip2.trim()));
      if (filteredIps.length > 0) {
        return filteredIps.map((item) => item.trim());
      }
    }
  }
  return null;
}
function getClientIp(req, res, next) {
  if (!req) throw new Error("Request is undefined");
  const ips = $extractIpFromHeaders(req);
  if (ips && ips.length > 0) {
    req.clientIp = ips[0];
    req.clientIps = ips;
    next?.();
    return ips[0];
  }
  if ($isIP(req.socket.remoteAddress)) {
    req.clientIp = req.socket.remoteAddress;
    req.clientIps = [req.socket.remoteAddress];
    next?.();
    return req.socket.remoteAddress;
  }
  if ($isIP(req.connection.remoteAddress)) {
    req.clientIp = req.connection.remoteAddress;
    req.clientIps = [req.connection.remoteAddress];
    next?.();
    return req.connection.remoteAddress;
  }
}

exports.getClientIp = getClientIp;
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