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- 'use strict'
-
- function formatHostname (hostname) {
- // canonicalize the hostname, so that 'oogle.com' won't match 'google.com'
- return hostname.replace(/^\.*/, '.').toLowerCase()
- }
-
- function parseNoProxyZone (zone) {
- zone = zone.trim().toLowerCase()
-
- var zoneParts = zone.split(':', 2)
- var zoneHost = formatHostname(zoneParts[0])
- var zonePort = zoneParts[1]
- var hasPort = zone.indexOf(':') > -1
-
- return {hostname: zoneHost, port: zonePort, hasPort: hasPort}
- }
-
- function uriInNoProxy (uri, noProxy) {
- var port = uri.port || (uri.protocol === 'https:' ? '443' : '80')
- var hostname = formatHostname(uri.hostname)
- var noProxyList = noProxy.split(',')
-
- // iterate through the noProxyList until it finds a match.
- return noProxyList.map(parseNoProxyZone).some(function (noProxyZone) {
- var isMatchedAt = hostname.indexOf(noProxyZone.hostname)
- var hostnameMatched = (
- isMatchedAt > -1 &&
- (isMatchedAt === hostname.length - noProxyZone.hostname.length)
- )
-
- if (noProxyZone.hasPort) {
- return (port === noProxyZone.port) && hostnameMatched
- }
-
- return hostnameMatched
- })
- }
-
- function getProxyFromURI (uri) {
- // Decide the proper request proxy to use based on the request URI object and the
- // environmental variables (NO_PROXY, HTTP_PROXY, etc.)
- // respect NO_PROXY environment variables (see: https://lynx.invisible-island.net/lynx2.8.7/breakout/lynx_help/keystrokes/environments.html)
-
- var noProxy = process.env.NO_PROXY || process.env.no_proxy || ''
-
- // if the noProxy is a wildcard then return null
-
- if (noProxy === '*') {
- return null
- }
-
- // if the noProxy is not empty and the uri is found return null
-
- if (noProxy !== '' && uriInNoProxy(uri, noProxy)) {
- return null
- }
-
- // Check for HTTP or HTTPS Proxy in environment Else default to null
-
- if (uri.protocol === 'http:') {
- return process.env.HTTP_PROXY ||
- process.env.http_proxy || null
- }
-
- if (uri.protocol === 'https:') {
- return process.env.HTTPS_PROXY ||
- process.env.https_proxy ||
- process.env.HTTP_PROXY ||
- process.env.http_proxy || null
- }
-
- // if none of that works, return null
- // (What uri protocol are you using then?)
-
- return null
- }
-
- module.exports = getProxyFromURI
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