Abstraction for retrieving ip address information from a Node.js connection. Searches for proxy headers before degrading req.address. 

Abstraction for retrieving ip address information from a Node.js connection. Searches for proxy headers before degrading req.address

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 * @param {Boolean} secured The connection was secured.

 * List of possible proxy headers that should be checked for the original client

    port: 'fastly-client-port', // Estimated guess, no standard header available.

    port: 'z-forwarded-port',   // Estimated guess, no standard header available.

    proto: 'z-forwarded-proto'  // Estimated guess, no standard header available.

    proto: 'forwarded-proto'    // Estimated guess, no standard header available.

    port: 'x-real-port',        // Estimated guess, no standard header available.

    proto: 'x-real-proto'       // Estimated guess, no standard header available.

 * Regex to split a string into an array of its words.

 * Search the headers for a possible match against a known proxy header.

 * @param {Object} headers The received HTTP headers.

 * @param {Array} whitelist White list of proxies that should be checked.

 * @returns {String|Undefined} A IP address or nothing.

  var ports, port, proto, ips, ip, length = proxies.length, i = 0;

    if (!(proxies[i].ip in headers)) continue;

    ports = (headers[proxies[i].port] || '').split(',');

    ips = (headers[proxies[i].ip] || '').split(',');

    ips = (headers[proxies[i].ip] || '').match(pattern);

    proto = (headers[proxies[i].proto] || 'http');

    // As these headers can potentially be set by a 1337H4X0R we need to ensure

    // that all supplied values are valid IP addresses. If we receive a none

    // IP value inside the IP header field we are going to assume that this

    // header has been compromised and should be ignored

    if (!ips.length || !ips.every(net.isIP)) return;

    if (!ips || !ips.every(net.isIP)) return;

    port = ports.shift();   // Extract the first port as it's the "source" port.

    ip = ips.shift();       // Extract the first IP as it's the "source" IP.

    // If we were given a white list, we need to ensure that the proxies that

    // we're given are known and allowed.

    if (whitelist && whitelist.length && !ips.every(function every(ip) {

      return ~whitelist.indexOf(ip.trim());

    // Shift the most recently found proxy header to the front of the proxies

    // array. This optimizes future calls, placing the most commonly found headers

      proxies.unshift(proxies.splice(i, 1)[0]);

    // We've gotten a match on a HTTP header, we need to parse it further as it

    // could consist of multiple hops. The pattern for multiple hops is:

    //   client, proxy, proxy, proxy, etc.

    // So extracting the first IP should be sufficient. There are SSL

    // terminators like the once's that is used by `fastly.com` which set their

    // HTTPS header to `1` as an indication that the connection was secure.

    return new Forwarded(ip, port, proto === '1' || proto === 'https');

 * @param {Object} obj A socket like object that could contain a `remoteAddress`.

function parse(obj, headers, whitelist) {

  var proxied = forwarded(headers || {}, whitelist)

  // We should always be testing for HTTP headers as remoteAddress would point

  // Check for the property on our given object.

        'secure' in obj ? obj.secure : obj.encrypted

    if ('object' === typeof obj.address && obj.address.address) {

  if ('object' === typeof connection && 'remoteAddress' in connection) {

      'secure' in connection ? connection.secure : connection.encrypted

  if ('object' === typeof socket && 'remoteAddress' in socket) {

      'secure' in socket ? socket.secure : socket.encrypted

// Expose the module and all of it's interfaces.

  "description": "Abstraction for retrieving ip address information from a Node.js connection. Searches for proxy headers before degrading req.address",

    "coverage": "istanbul cover node_modules/.bin/_mocha -- --reporter spec --ui bdd test.js",

    "test": "mocha --reporter spec test.js",

    "test-travis": "istanbul cover node_modules/.bin/_mocha --report lcovonly -- --reporter spec --ui bdd test.js"

    "test-travis": "istanbul cover _mocha --report lcovonly"

    "url": "git://github.com/primus/forwarded-for.git"

    "url": "https://github.com/primus/forwarded-for/issues"

  "homepage": "https://github.com/primus/forwarded-for",

		@@ -53,2 +53,9 @@ 'use strict';
		/**
		* Regex to split a string into an array of its words.
		*
		* @type {RegExp}
		*/
		var pattern = /[^\s,]+/g;

		/**
		* Search the headers for a possible match against a known proxy header.
		@@ -68,3 +75,3 @@ *
		ports = (headers[proxies[i].port] \|\| '').split(',');
		ips = (headers[proxies[i].ip] \|\| '').split(',');
		ips = (headers[proxies[i].ip] \|\| '').match(pattern);
		proto = (headers[proxies[i].proto] \|\| 'http');
		@@ -78,3 +85,3 @@
		//
		if (!ips.length \|\| !ips.every(net.isIP)) return;
		if (!ips \|\| !ips.every(net.isIP)) return;

		@@ -89,3 +96,3 @@ port = ports.shift(); // Extract the first port as it's the "source" port.
		if (whitelist && whitelist.length && !ips.every(function every(ip) {
		return ~whitelist.indexOf(ip.trim());
		return ~whitelist.indexOf(ip);
		})) return;
		@@ -92,0 +99,0 @@

		{
		"name": "forwarded-for",
		"version": "1.0.0",
		"version": "1.0.1",
		"description": "Abstraction for retrieving ip address information from a Node.js connection. Searches for proxy headers before degrading req.address",
		"main": "index.js",
		"scripts": {
		"coverage": "istanbul cover node_modules/.bin/_mocha -- --reporter spec --ui bdd test.js",
		"test": "mocha --reporter spec test.js",
		"test-travis": "istanbul cover node_modules/.bin/_mocha --report lcovonly -- --reporter spec --ui bdd test.js"
		"coverage": "istanbul cover _mocha",
		"test": "mocha",
		"test-travis": "istanbul cover _mocha --report lcovonly"
		},
		@@ -40,7 +40,7 @@ "repository": {
		"devDependencies": {
		"assume": "1.1.x",
		"istanbul": "0.3.x",
		"mocha": "2.1.x",
		"pre-commit": "0.0.x"
		"assume": "1.4.x",
		"istanbul": "0.4.x",
		"mocha": "2.4.x",
		"pre-commit": "1.1.x"
		}
		}

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