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'use strict'
const LRU = require('lru-cache')
const url = require('url')
let AGENT_CACHE = new LRU({ max: 50 })
let HttpsAgent
let HttpAgent
module.exports = getAgent
function getAgent (uri, opts) {
const parsedUri = url.parse(typeof uri === 'string' ? uri : uri.url)
const isHttps = parsedUri.protocol === 'https:'
const pxuri = getProxyUri(uri, opts)
const key = [
`https:${isHttps}`,
pxuri
? `proxy:${pxuri.protocol}//${pxuri.host}:${pxuri.port}`
: '>no-proxy<',
`local-address:${opts.localAddress || '>no-local-address<'}`,
`strict-ssl:${isHttps ? !!opts.strictSSL : '>no-strict-ssl<'}`,
`ca:${(isHttps && opts.ca) || '>no-ca<'}`,
`cert:${(isHttps && opts.cert) || '>no-cert<'}`,
`key:${(isHttps && opts.key) || '>no-key<'}`
].join(':')
if (opts.agent != null) { // `agent: false` has special behavior!
return opts.agent
}
if (AGENT_CACHE.peek(key)) {
return AGENT_CACHE.get(key)
}
if (pxuri) {
const proxy = getProxy(pxuri, opts, isHttps)
AGENT_CACHE.set(key, proxy)
return proxy
}
if (isHttps && !HttpsAgent) {
HttpsAgent = require('agentkeepalive').HttpsAgent
} else if (!isHttps && !HttpAgent) {
HttpAgent = require('agentkeepalive')
}
// If opts.timeout is zero, set the agentTimeout to zero as well. A timeout
// of zero disables the timeout behavior (OS limits still apply). Else, if
// opts.timeout is a non-zero value, set it to timeout + 1, to ensure that
// the node-fetch-npm timeout will always fire first, giving us more
// consistent errors.
const agentTimeout = opts.timeout === 0 ? 0 : opts.timeout + 1
const agent = isHttps ? new HttpsAgent({
maxSockets: opts.maxSockets || 15,
ca: opts.ca,
cert: opts.cert,
key: opts.key,
localAddress: opts.localAddress,
rejectUnauthorized: opts.strictSSL,
timeout: agentTimeout
}) : new HttpAgent({
maxSockets: opts.maxSockets || 15,
localAddress: opts.localAddress,
timeout: agentTimeout
})
AGENT_CACHE.set(key, agent)
return agent
}
function checkNoProxy (uri, opts) {
const host = url.parse(uri).hostname.split('.').reverse()
let noproxy = (opts.noProxy || getProcessEnv('no_proxy'))
if (typeof noproxy === 'string') {
noproxy = noproxy.split(/\s*,\s*/g)
}
return noproxy && noproxy.some(no => {
const noParts = no.split('.').filter(x => x).reverse()
if (!noParts.length) { return false }
for (let i = 0; i < noParts.length; i++) {
if (host[i] !== noParts[i]) {
return false
}
}
return true
})
}
module.exports.getProcessEnv = getProcessEnv
function getProcessEnv (env) {
if (!env) { return }
let value
if (Array.isArray(env)) {
for (let e of env) {
value = process.env[e] ||
process.env[e.toUpperCase()] ||
process.env[e.toLowerCase()]
if (typeof value !== 'undefined') { break }
}
}
if (typeof env === 'string') {
value = process.env[env] ||
process.env[env.toUpperCase()] ||
process.env[env.toLowerCase()]
}
return value
}
function getProxyUri (uri, opts) {
const protocol = url.parse(uri).protocol
const proxy = opts.proxy || (
protocol === 'https:' && getProcessEnv('https_proxy')
) || (
protocol === 'http:' && getProcessEnv(['https_proxy', 'http_proxy', 'proxy'])
)
if (!proxy) { return null }
const parsedProxy = (typeof proxy === 'string') ? url.parse(proxy) : proxy
return !checkNoProxy(uri, opts) && parsedProxy
}
let HttpProxyAgent
let HttpsProxyAgent
let SocksProxyAgent
function getProxy (proxyUrl, opts, isHttps) {
let popts = {
host: proxyUrl.hostname,
port: proxyUrl.port,
protocol: proxyUrl.protocol,
path: proxyUrl.path,
auth: proxyUrl.auth,
ca: opts.ca,
cert: opts.cert,
key: opts.key,
timeout: opts.timeout === 0 ? 0 : opts.timeout + 1,
localAddress: opts.localAddress,
maxSockets: opts.maxSockets || 15,
rejectUnauthorized: opts.strictSSL
}
if (proxyUrl.protocol === 'http:' || proxyUrl.protocol === 'https:') {
if (!isHttps) {
if (!HttpProxyAgent) {
HttpProxyAgent = require('http-proxy-agent')
}
return new HttpProxyAgent(popts)
} else {
if (!HttpsProxyAgent) {
HttpsProxyAgent = require('https-proxy-agent')
}
return new HttpsProxyAgent(popts)
}
}
if (proxyUrl.protocol.startsWith('socks')) {
if (!SocksProxyAgent) {
SocksProxyAgent = require('socks-proxy-agent')
}
return new SocksProxyAgent(popts)
}
}
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