1'use strict' 2 3function formatHostname (hostname) { 4 // canonicalize the hostname, so that 'oogle.com' won't match 'google.com' 5 return hostname.replace(/^\.*/, '.').toLowerCase() 6} 7 8function parseNoProxyZone (zone) { 9 zone = zone.trim().toLowerCase() 10 11 var zoneParts = zone.split(':', 2) 12 var zoneHost = formatHostname(zoneParts[0]) 13 var zonePort = zoneParts[1] 14 var hasPort = zone.indexOf(':') > -1 15 16 return {hostname: zoneHost, port: zonePort, hasPort: hasPort} 17} 18 19function uriInNoProxy (uri, noProxy) { 20 var port = uri.port || (uri.protocol === 'https:' ? '443' : '80') 21 var hostname = formatHostname(uri.hostname) 22 var noProxyList = noProxy.split(',') 23 24 // iterate through the noProxyList until it finds a match. 25 return noProxyList.map(parseNoProxyZone).some(function (noProxyZone) { 26 var isMatchedAt = hostname.indexOf(noProxyZone.hostname) 27 var hostnameMatched = ( 28 isMatchedAt > -1 && 29 (isMatchedAt === hostname.length - noProxyZone.hostname.length) 30 ) 31 32 if (noProxyZone.hasPort) { 33 return (port === noProxyZone.port) && hostnameMatched 34 } 35 36 return hostnameMatched 37 }) 38} 39 40function getProxyFromURI (uri) { 41 // Decide the proper request proxy to use based on the request URI object and the 42 // environmental variables (NO_PROXY, HTTP_PROXY, etc.) 43 // respect NO_PROXY environment variables (see: http://lynx.isc.org/current/breakout/lynx_help/keystrokes/environments.html) 44 45 var noProxy = process.env.NO_PROXY || process.env.no_proxy || '' 46 47 // if the noProxy is a wildcard then return null 48 49 if (noProxy === '*') { 50 return null 51 } 52 53 // if the noProxy is not empty and the uri is found return null 54 55 if (noProxy !== '' && uriInNoProxy(uri, noProxy)) { 56 return null 57 } 58 59 // Check for HTTP or HTTPS Proxy in environment Else default to null 60 61 if (uri.protocol === 'http:') { 62 return process.env.HTTP_PROXY || 63 process.env.http_proxy || null 64 } 65 66 if (uri.protocol === 'https:') { 67 return process.env.HTTPS_PROXY || 68 process.env.https_proxy || 69 process.env.HTTP_PROXY || 70 process.env.http_proxy || null 71 } 72 73 // if none of that works, return null 74 // (What uri protocol are you using then?) 75 76 return null 77} 78 79module.exports = getProxyFromURI 80