source: trip-planner-front/node_modules/forwarded/index.js@ 571e0df

Last change on this file since 571e0df was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 1.5 KB
Line 
1/*!
2 * forwarded
3 * Copyright(c) 2014-2017 Douglas Christopher Wilson
4 * MIT Licensed
5 */
6
7'use strict'
8
9/**
10 * Module exports.
11 * @public
12 */
13
14module.exports = forwarded
15
16/**
17 * Get all addresses in the request, using the `X-Forwarded-For` header.
18 *
19 * @param {object} req
20 * @return {array}
21 * @public
22 */
23
24function forwarded (req) {
25 if (!req) {
26 throw new TypeError('argument req is required')
27 }
28
29 // simple header parsing
30 var proxyAddrs = parse(req.headers['x-forwarded-for'] || '')
31 var socketAddr = getSocketAddr(req)
32 var addrs = [socketAddr].concat(proxyAddrs)
33
34 // return all addresses
35 return addrs
36}
37
38/**
39 * Get the socket address for a request.
40 *
41 * @param {object} req
42 * @return {string}
43 * @private
44 */
45
46function getSocketAddr (req) {
47 return req.socket
48 ? req.socket.remoteAddress
49 : req.connection.remoteAddress
50}
51
52/**
53 * Parse the X-Forwarded-For header.
54 *
55 * @param {string} header
56 * @private
57 */
58
59function parse (header) {
60 var end = header.length
61 var list = []
62 var start = header.length
63
64 // gather addresses, backwards
65 for (var i = header.length - 1; i >= 0; i--) {
66 switch (header.charCodeAt(i)) {
67 case 0x20: /* */
68 if (start === end) {
69 start = end = i
70 }
71 break
72 case 0x2c: /* , */
73 if (start !== end) {
74 list.push(header.substring(start, end))
75 }
76 start = end = i
77 break
78 default:
79 start = i
80 break
81 }
82 }
83
84 // final address
85 if (start !== end) {
86 list.push(header.substring(start, end))
87 }
88
89 return list
90}
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