stacker.news/lib/proxy.js

121 lines
3.8 KiB
JavaScript

import http from 'http'
import https from 'https'
// from https://github.com/delvedor/hpagent
export class HttpProxyAgent extends http.Agent {
constructor (options) {
const { proxy, proxyRequestOptions, ...opts } = options
super(opts)
this.proxy = typeof proxy === 'string'
? new URL(proxy)
: proxy
this.proxyRequestOptions = proxyRequestOptions || {}
}
createConnection (options, callback) {
const requestOptions = {
...this.proxyRequestOptions,
method: 'CONNECT',
host: this.proxy.hostname,
port: this.proxy.port,
path: `${options.host}:${options.port}`,
setHost: false,
headers: { ...this.proxyRequestOptions.headers, connection: this.keepAlive ? 'keep-alive' : 'close', host: `${options.host}:${options.port}` },
agent: false,
timeout: options.timeout || 0
}
if (this.proxy.username || this.proxy.password) {
const base64 = Buffer.from(`${decodeURIComponent(this.proxy.username || '')}:${decodeURIComponent(this.proxy.password || '')}`).toString('base64')
requestOptions.headers['proxy-authorization'] = `Basic ${base64}`
}
if (this.proxy.protocol === 'https:') {
requestOptions.servername = this.proxy.hostname
}
const request = (this.proxy.protocol === 'http:' ? http : https).request(requestOptions)
request.once('connect', (response, socket, head) => {
request.removeAllListeners()
socket.removeAllListeners()
if (response.statusCode === 200) {
callback(null, socket)
} else {
socket.destroy()
callback(new Error(`Bad response: ${response.statusCode}`), null)
}
})
request.once('timeout', () => {
request.destroy(new Error('Proxy timeout'))
})
request.once('error', err => {
request.removeAllListeners()
callback(err, null)
})
request.end()
}
}
export class HttpsProxyAgent extends https.Agent {
constructor (options) {
const { proxy, proxyRequestOptions, ...opts } = options
super(opts)
this.proxy = typeof proxy === 'string'
? new URL(proxy)
: proxy
this.proxyRequestOptions = proxyRequestOptions || {}
}
createConnection (options, callback) {
const requestOptions = {
...this.proxyRequestOptions,
method: 'CONNECT',
host: this.proxy.hostname,
port: this.proxy.port,
path: `${options.host}:${options.port}`,
setHost: false,
headers: { ...this.proxyRequestOptions.headers, connection: this.keepAlive ? 'keep-alive' : 'close', host: `${options.host}:${options.port}` },
agent: false,
timeout: options.timeout || 0
}
if (this.proxy.username || this.proxy.password) {
const base64 = Buffer.from(`${decodeURIComponent(this.proxy.username || '')}:${decodeURIComponent(this.proxy.password || '')}`).toString('base64')
requestOptions.headers['proxy-authorization'] = `Basic ${base64}`
}
// Necessary for the TLS check with the proxy to succeed.
if (this.proxy.protocol === 'https:') {
requestOptions.servername = this.proxy.hostname
}
const request = (this.proxy.protocol === 'http:' ? http : https).request(requestOptions)
request.once('connect', (response, socket, head) => {
request.removeAllListeners()
socket.removeAllListeners()
if (response.statusCode === 200) {
const secureSocket = super.createConnection({ ...options, socket })
callback(null, secureSocket)
} else {
socket.destroy()
callback(new Error(`Bad response: ${response.statusCode}`), null)
}
})
request.once('timeout', () => {
request.destroy(new Error('Proxy timeout'))
})
request.once('error', err => {
request.removeAllListeners()
callback(err, null)
})
request.end()
}
}