Fetch address from wifi for OSX

loc.rb

#!/usr/bin/env ruby
#
# Fetch my current address from mac addresses on wi-fi for MacOSX 
#
# via http://unknownplace.org/memo/2012/07/21/1/
#
# GeolocationAPI 
#   http://code.google.com/p/gears/wiki/GeolocationAPI
# Reverse Geocoding 
#   https://developers.google.com/maps/documentation/geocoding/?hl=ja#ReverseGeocoding

require 'json'
require 'net/http'
require 'uri'

addrs = {} # mac_address => signal_strength(RSSI)

wifi = `/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport -s`
wifi.split("\n").slice(1..wifi.size).each do |line|
  a = line.strip.split(/\s+/)
  addrs[a[1]] = a[2] 
end 

query = JSON::generate({
  version: '1.1.0',
  host: 'maps.google.com',
  request_address: true,
  address_language: 'ja_JP',
  wifi_towers: addrs.keys.map{|addr| {
    mac_address: addr,
    signal_strength: addrs[addr],
    age: 0
  }}
})

# p query

Net::HTTP.start('www.google.com', 80){ |http|
  response = http.post('/loc/json', query)

  begin
    loc = JSON::parse(response.body)
    latlng = [loc['location']['latitude'], loc['location']['longitude']]

    # puts "http://maps.google.com/?q=%s,%s" % latlng
    
    revgeo = JSON::parse(
      http.get(
        "http://maps.googleapis.com/maps/api/geocode/json?latlng=%s,%s&sensor=true" % latlng, 
        #{"Accept-Language" => "ja,en-US"}
        {"Accept-Language" => ENV["LANG"].match(/(\w+)_/)[1]}
      ).body)

    puts revgeo["results"][0]["formatted_address"]

  rescue
    p response.body
  end
  
}