O(1) proxy.pac file

proxy.pac

// Generated by gfwlist2pac
// created by @clowwindy via python
// modified by @cube via native zsh
// https://github.com/cuber/gfwlist2pac
var domains = {
  'dnsimple.com': 1,
  'stackoverflow.com': 1,
  'igvita.com': 1,
  'jetbrains.com': 1,
  'linost.com': 1,
  'linode.com': 1,
  'githubapp.com': 1,
  'wikimedia.org': 1,
  'v2ex.com': 1,
  'btdigg.org': 1,
  'eigenlogik.com': 1,
  'apache.org': 1,
  'digitalocean.com': 1,
  'linkedin.com': 1,
  'instagram.com': 1,
  'jquery.com': 1,
  'github.com': 1,
  'iceimg.com': 1,
  'firstrade.com': 1,
  'godaddy.com': 1,
  'amazon.com': 1,
  'digitalattackmap.com': 1,
  'startssl.com': 1,
  'agilebits.com': 1,
  'speedtest.net': 1
} // end of domains

// proxy failover
var proxy  = 'SOCKS5 127.0.0.1:7070; SOCKS 127.0.0.1:7070; DIRECT;'
var direct = 'DIRECT;'

// function of proxy router
function FindProxyForURL(url, host) {
  // restrict all google related domains to proxy
  if (/google/i.test(host)) return proxy;
  // recursive detection domains
  do {
    if (domains.hasOwnProperty(host)) return proxy;
    off  = host.indexOf('.') + 1;
    host = host.slice(off);
  } while (off >= 1);
  return direct;
}