df4e06385a
Initial setup of project dependencies including axios, express, dotenv, and other supporting packages. Added configuration files and documentation for project setup and usage.
91 lines
1.5 KiB
JavaScript
91 lines
1.5 KiB
JavaScript
/*!
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* forwarded
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* Copyright(c) 2014-2017 Douglas Christopher Wilson
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* MIT Licensed
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*/
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'use strict'
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/**
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* Module exports.
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* @public
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*/
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module.exports = forwarded
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/**
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* Get all addresses in the request, using the `X-Forwarded-For` header.
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*
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* @param {object} req
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* @return {array}
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* @public
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*/
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function forwarded (req) {
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if (!req) {
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throw new TypeError('argument req is required')
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}
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// simple header parsing
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var proxyAddrs = parse(req.headers['x-forwarded-for'] || '')
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var socketAddr = getSocketAddr(req)
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var addrs = [socketAddr].concat(proxyAddrs)
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// return all addresses
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return addrs
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}
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/**
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* Get the socket address for a request.
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*
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* @param {object} req
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* @return {string}
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* @private
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*/
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function getSocketAddr (req) {
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return req.socket
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? req.socket.remoteAddress
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: req.connection.remoteAddress
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}
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/**
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* Parse the X-Forwarded-For header.
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*
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* @param {string} header
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* @private
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*/
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function parse (header) {
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var end = header.length
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var list = []
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var start = header.length
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// gather addresses, backwards
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for (var i = header.length - 1; i >= 0; i--) {
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switch (header.charCodeAt(i)) {
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case 0x20: /* */
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if (start === end) {
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start = end = i
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}
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break
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case 0x2c: /* , */
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if (start !== end) {
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list.push(header.substring(start, end))
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}
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start = end = i
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break
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default:
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start = i
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break
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}
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}
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// final address
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if (start !== end) {
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list.push(header.substring(start, end))
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}
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return list
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}
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