Spaces:
Runtime error
Runtime error
File size: 5,351 Bytes
311cc15 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 |
'use strict'
const { kProxy, kClose, kDestroy, kInterceptors } = require('./core/symbols')
const { URL } = require('url')
const Agent = require('./agent')
const Pool = require('./pool')
const DispatcherBase = require('./dispatcher-base')
const { InvalidArgumentError, RequestAbortedError } = require('./core/errors')
const buildConnector = require('./core/connect')
const kAgent = Symbol('proxy agent')
const kClient = Symbol('proxy client')
const kProxyHeaders = Symbol('proxy headers')
const kRequestTls = Symbol('request tls settings')
const kProxyTls = Symbol('proxy tls settings')
const kConnectEndpoint = Symbol('connect endpoint function')
function defaultProtocolPort (protocol) {
return protocol === 'https:' ? 443 : 80
}
function buildProxyOptions (opts) {
if (typeof opts === 'string') {
opts = { uri: opts }
}
if (!opts || !opts.uri) {
throw new InvalidArgumentError('Proxy opts.uri is mandatory')
}
return {
uri: opts.uri,
protocol: opts.protocol || 'https'
}
}
function defaultFactory (origin, opts) {
return new Pool(origin, opts)
}
class ProxyAgent extends DispatcherBase {
constructor (opts) {
super(opts)
this[kProxy] = buildProxyOptions(opts)
this[kAgent] = new Agent(opts)
this[kInterceptors] = opts.interceptors && opts.interceptors.ProxyAgent && Array.isArray(opts.interceptors.ProxyAgent)
? opts.interceptors.ProxyAgent
: []
if (typeof opts === 'string') {
opts = { uri: opts }
}
if (!opts || !opts.uri) {
throw new InvalidArgumentError('Proxy opts.uri is mandatory')
}
const { clientFactory = defaultFactory } = opts
if (typeof clientFactory !== 'function') {
throw new InvalidArgumentError('Proxy opts.clientFactory must be a function.')
}
this[kRequestTls] = opts.requestTls
this[kProxyTls] = opts.proxyTls
this[kProxyHeaders] = opts.headers || {}
if (opts.auth && opts.token) {
throw new InvalidArgumentError('opts.auth cannot be used in combination with opts.token')
} else if (opts.auth) {
/* @deprecated in favour of opts.token */
this[kProxyHeaders]['proxy-authorization'] = `Basic ${opts.auth}`
} else if (opts.token) {
this[kProxyHeaders]['proxy-authorization'] = opts.token
}
const resolvedUrl = new URL(opts.uri)
const { origin, port, host } = resolvedUrl
const connect = buildConnector({ ...opts.proxyTls })
this[kConnectEndpoint] = buildConnector({ ...opts.requestTls })
this[kClient] = clientFactory(resolvedUrl, { connect })
this[kAgent] = new Agent({
...opts,
connect: async (opts, callback) => {
let requestedHost = opts.host
if (!opts.port) {
requestedHost += `:${defaultProtocolPort(opts.protocol)}`
}
try {
const { socket, statusCode } = await this[kClient].connect({
origin,
port,
path: requestedHost,
signal: opts.signal,
headers: {
...this[kProxyHeaders],
host
}
})
if (statusCode !== 200) {
socket.on('error', () => {}).destroy()
callback(new RequestAbortedError('Proxy response !== 200 when HTTP Tunneling'))
}
if (opts.protocol !== 'https:') {
callback(null, socket)
return
}
let servername
if (this[kRequestTls]) {
servername = this[kRequestTls].servername
} else {
servername = opts.servername
}
this[kConnectEndpoint]({ ...opts, servername, httpSocket: socket }, callback)
} catch (err) {
callback(err)
}
}
})
}
dispatch (opts, handler) {
const { host } = new URL(opts.origin)
const headers = buildHeaders(opts.headers)
throwIfProxyAuthIsSent(headers)
return this[kAgent].dispatch(
{
...opts,
headers: {
...headers,
host
}
},
handler
)
}
async [kClose] () {
await this[kAgent].close()
await this[kClient].close()
}
async [kDestroy] () {
await this[kAgent].destroy()
await this[kClient].destroy()
}
}
/**
* @param {string[] | Record<string, string>} headers
* @returns {Record<string, string>}
*/
function buildHeaders (headers) {
// When using undici.fetch, the headers list is stored
// as an array.
if (Array.isArray(headers)) {
/** @type {Record<string, string>} */
const headersPair = {}
for (let i = 0; i < headers.length; i += 2) {
headersPair[headers[i]] = headers[i + 1]
}
return headersPair
}
return headers
}
/**
* @param {Record<string, string>} headers
*
* Previous versions of ProxyAgent suggests the Proxy-Authorization in request headers
* Nevertheless, it was changed and to avoid a security vulnerability by end users
* this check was created.
* It should be removed in the next major version for performance reasons
*/
function throwIfProxyAuthIsSent (headers) {
const existProxyAuth = headers && Object.keys(headers)
.find((key) => key.toLowerCase() === 'proxy-authorization')
if (existProxyAuth) {
throw new InvalidArgumentError('Proxy-Authorization should be sent in ProxyAgent constructor')
}
}
module.exports = ProxyAgent
|