| '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) |
| , zoneHost = formatHostname(zoneParts[0]) |
| , zonePort = zoneParts[1] |
| , hasPort = zone.indexOf(':') > -1 |
| |
| return {hostname: zoneHost, port: zonePort, hasPort: hasPort} |
| } |
| |
| function uriInNoProxy(uri, noProxy) { |
| var port = uri.port || (uri.protocol === 'https:' ? '443' : '80') |
| , hostname = formatHostname(uri.hostname) |
| , 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) |
| , 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: http://lynx.isc.org/current/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 |