Gets your location using the google wifi location service (also used by Firefox) using the Mac OS X CoreWLAN framework on Snow Leopard. Also compare to the CoreLocation based version https://gist.github.com/266916

google_user_location.rb

require 'pp'
require 'net/http'
require 'net/https'
require 'rubygems'
require 'json'

def bssid_to_api(bssidstr)
  bssidstr.gsub(':', '-').gsub(/(\-|\A)(\d)(\-|\Z)/) {|match| "#{match[0]}0#{match[1]}#{match[2]}"}
end

def request_location(body_hash)
  host = 'www.google.com'
  http = Net::HTTP.new(host, 443)
  http.set_debug_output $stderr if $DEBUG
  http.use_ssl = true
  body_data = body_hash.to_json
  headers = {'Content-Type' => 'text/plain; charset=UTF-8',
             'Content-Length' => body_data.size.to_s,
             'Host' => host}
  path = '/loc/json'
  resp, data = http.post(path, body_data, headers)
  return [resp, data]  
end

request_body = {"version" => "1.1.0",
                "request_address" => true,
                "wifi_towers" => []}
if defined? MACRUBY_VERSION
  framework 'CoreWLAN'

  interface = CWInterface.interfaceWithName 'en1'
  nets = interface.scanForNetworksWithParameters({}, error: nil)
  
  nets.each do |network|
    request_body['wifi_towers'] << {'mac_address' => bssid_to_api(network.bssid),
                                    'ssid' => network.ssid,
                                    'signal_strength' => network.rssi.to_s.to_i}
  end
else
  # TODO: do this in other rubies
  request_body['wifi_towers'] = []
end

res, data = request_location(request_body)

pp JSON.parse(data)