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