Last change
on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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[6a3a178] | 1 | /*!
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| 2 | * forwarded
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| 3 | * Copyright(c) 2014-2017 Douglas Christopher Wilson
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| 4 | * MIT Licensed
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| 5 | */
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| 6 |
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| 7 | 'use strict'
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| 8 |
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| 9 | /**
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| 10 | * Module exports.
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| 11 | * @public
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| 12 | */
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| 13 |
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| 14 | module.exports = forwarded
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| 15 |
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| 16 | /**
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| 17 | * Get all addresses in the request, using the `X-Forwarded-For` header.
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| 18 | *
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| 19 | * @param {object} req
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| 20 | * @return {array}
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| 21 | * @public
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| 22 | */
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| 23 |
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| 24 | function forwarded (req) {
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| 25 | if (!req) {
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| 26 | throw new TypeError('argument req is required')
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| 27 | }
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| 28 |
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| 29 | // simple header parsing
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| 30 | var proxyAddrs = parse(req.headers['x-forwarded-for'] || '')
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| 31 | var socketAddr = getSocketAddr(req)
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| 32 | var addrs = [socketAddr].concat(proxyAddrs)
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| 33 |
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| 34 | // return all addresses
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| 35 | return addrs
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| 36 | }
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| 37 |
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| 38 | /**
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| 39 | * Get the socket address for a request.
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| 40 | *
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| 41 | * @param {object} req
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| 42 | * @return {string}
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| 43 | * @private
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| 44 | */
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| 45 |
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| 46 | function getSocketAddr (req) {
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| 47 | return req.socket
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| 48 | ? req.socket.remoteAddress
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| 49 | : req.connection.remoteAddress
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| 50 | }
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| 51 |
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| 52 | /**
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| 53 | * Parse the X-Forwarded-For header.
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| 54 | *
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| 55 | * @param {string} header
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| 56 | * @private
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| 57 | */
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| 58 |
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| 59 | function parse (header) {
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| 60 | var end = header.length
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| 61 | var list = []
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| 62 | var start = header.length
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| 63 |
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| 64 | // gather addresses, backwards
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| 65 | for (var i = header.length - 1; i >= 0; i--) {
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| 66 | switch (header.charCodeAt(i)) {
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| 67 | case 0x20: /* */
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| 68 | if (start === end) {
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| 69 | start = end = i
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| 70 | }
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| 71 | break
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| 72 | case 0x2c: /* , */
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| 73 | if (start !== end) {
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| 74 | list.push(header.substring(start, end))
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| 75 | }
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| 76 | start = end = i
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| 77 | break
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| 78 | default:
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| 79 | start = i
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| 80 | break
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| 81 | }
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| 82 | }
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| 83 |
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| 84 | // final address
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| 85 | if (start !== end) {
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| 86 | list.push(header.substring(start, end))
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| 87 | }
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| 88 |
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| 89 | return list
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| 90 | }
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