晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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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: 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