sample pacfile for work

work.js.pac

function FindProxyForURL(url, host) {
        var lhost = host.toLowerCase();
        var proxy_yes = "SOCKS5 127.0.0.1:18080";
        var blackhole = "PROXY 127.0.0.1:80";
        var proxy_no = "DIRECT";
        host = lhost; 
        if ((host == "locahost") ||
            (shExpMatch(host, "locahost.*")) ||
            (host == "127.0.0.1")) {
               return proxy_no;
        }
        if (dnsDomainIs(host, "twitter.com") || dnsDomainIs(host, ".twitter.com") || shExpMatch(url, "twitter.com")) {
                return blackhole;
        } else if (dnsDomainIs(host, ".facebook.com") || shExpMatch(host, "facebook.com")) {
                return blackhole;
        } else if (dnsDomainIs(host, ".youtube.com") || shExpMatch(host, "youtube.com")) {
                return blackhole;
        } else if (dnsDomainIs(host, ".ytimg.com") || shExpMatch(host, "ytimg.com")) {
                return blackhole;
        } else if (dnsDomainIs(host, ".tumblr.com") || shExpMatch(host, "tumblr.com")) {
                return proxy_yes;
        } 
        return proxy_no;
}

• inspired by http://findproxyforurl.com/pac-functions/
  • enable
    • networksetup -setautoproxyurl Wi-Fi $raw_address_of_this_gist
  • check status
    • scutil --proxy
  • disable
    • networksetup -setautoproxyurl Wi-Fi off