PAC that uses a white list

proxy-pac.js

/*global isPlainHostName, isInNet*/
// inspired by http://chenyufei.info/blog/2012-03-18/pac-and-debug

var proxy = "SOCKS5 127.0.0.1:9999; SOCKS 127.0.0.1:9999; DIRECT"
var noProxy = "DIRECT"

var localhosts = [
  ['0.0.0.0', '255.255.255.255']
, ['192.168.0.0', '255.255.0.0']
, ['10.0.0.0', '255.0.0.0']
, ['172.0.0.0', '255.0.0.0']
, ['127.0.0.0', '255.255.255.0']
];

var gi
  , whiteListed = {}
  , whiteList = [
      "126.net"
    , "163.com"
    , "netease.com"
    , "alipay.com"
    , "alipayobjects.com"
    , "baidu.com"
    , "martianz.cn"
    , "martianlaboratory.com"
    , "bdimg.com"
    , "beansmile.com"
    , "campfirenow.com"
    , "alimama.com"
    , "com.cn"
    , "diandian.com"
    , "douban.com"
    , "edu.cn"
    , "feidee.com"
    , "google-analytics.com"
    , "guokr.com"
    , "iask.com"
    , "doitim.com"
    , "icast.cn"
    , "imrworldwide.com"
    , "kandian.com"
    , "libdd.com"
    , "mmcdn.cn"
    , "mmstat.com"
    , "newrelic.com"
    , "renren.com"
    , "rrfmn.com"
    , "rrimg.com"
    , "sinaapp.com"
    , "sinaimg.cn"
    , "sinajs.cn"
    , "sohu.com"
    , "tanx.com"
    , "taobao.com"
    , "taobaocdn.com"
    , "tbcdn.cn"
    , "tdimg.com"
    , "tianyaui.com"
    , "v2ex.com"
    , "weibo.com"
    , "workflowy.com"
    , "xiaonei.com"
    , "xnimg.cn"
    , "ydstatic.com"
    , "youdao.com"
    , "qq.com"
    , "zhi.hu"
    , "zhihu.com"
    , "miaozhen.com"
    , "alimama.cn"
    , "kankan.com"
    , "sandai.net"
    , "youku.com"
    , "adroll.com"
    , "tudouui.com"
    , "tudou.com"
    , "voicefive.com"
    , "stfile.com"
    , "xunlei.com"
    , "zhimg.com"
  ]

for (gi = 0; gi < whiteList.length; gi += 1) {
  whiteListed[whiteList[gi]] = true
}

function isLocal(host) {
  var i, ip, netmask
  if (isPlainHostName(host)) {
    return true
  }

  for (i = 0; i < localhosts.length; i++) {
    ip = localhosts[i][0]
    netmask = localhosts[i][1]
    if (isInNet(host, ip, netmask)) {
      return true
    }
  }

  return false
}

function hostToDomain(host) {
  var dotpos = host.lastIndexOf(".")
  if (dotpos === -1) {
    return host
  }

  // Find the second last dot
  dotpos = host.lastIndexOf(".", dotpos - 1)
  if (dotpos === -1) {
    return host
  }

  return host.substring(dotpos + 1)
}

function FindProxyForURL(url, host) {
  if (isLocal(host)) {
    return noProxy
  }
  return (whiteListed[hostToDomain(host)] ? noProxy : proxy)
}