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#!/usr/bin/env ruby
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require 'net/http'
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require 'json'
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module Rex
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  module Google
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    # @example
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    #   g = Rex::Google::Geolocation.new
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    #   g.set_api_key('example')
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    #   g.add_wlan("00:11:22:33:44:55", "example", -80)
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    #   g.fetch!
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    #   puts g, g.google_maps_url
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    class Geolocation
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      GOOGLE_API_URI = "https://www.googleapis.com/geolocation/v1/geolocate?key="
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      attr_accessor :accuracy
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      attr_accessor :latitude
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      attr_accessor :longitude
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      def initialize
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        @uri = URI.parse(URI::DEFAULT_PARSER.escape(GOOGLE_API_URI))
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        @wlan_list = []
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      end
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      # Ask Google's Maps API for the location of a given set of BSSIDs (MAC
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      # addresses of access points), ESSIDs (AP names), and signal strengths.
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      def fetch!
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        request = Net::HTTP::Post.new(@uri.request_uri)
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        request.body = {'wifiAccessPoints' => @wlan_list}.to_json
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        request['Content-Type'] = 'application/json'
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        http = Net::HTTP.new(@uri.host, @uri.port)
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        http.use_ssl = true
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        response = http.request(request)
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        msg = "Failure connecting to Google for location lookup."
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        if response && response.code == '200'
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          results = JSON.parse(response.body)
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          self.latitude = results["location"]["lat"]
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          self.longitude = results["location"]["lng"]
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          self.accuracy = results["accuracy"]
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        elsif response && response.body && response.code != '404' # we can json load and get a good error message
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          results = JSON.parse(response.body)
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          msg += " Code #{results['error']['code']} for query #{@uri} with error #{results['error']['message']}"
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          fail msg
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        else
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          msg += " Code #{response.code} for query #{@uri}" if response
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          fail msg
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        end
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      end
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      # Add an AP to the list to send to Google when {#fetch!} is called.
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      #
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      # @param mac [String] in the form "00:11:22:33:44:55"
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      # @param signal_strength [String] a thing like
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      def add_wlan(mac, signal_strength)
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        @wlan_list.push({ :macAddress => mac.upcase.to_s, :signalStrength => signal_strength.to_s })
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      end
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      def set_api_key(key)
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        @uri = URI.parse(URI::DEFAULT_PARSER.escape(GOOGLE_API_URI + key))
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      end
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      def google_maps_url
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        "https://maps.google.com/?q=#{latitude},#{longitude}"
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      end
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      def to_s
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        "Google indicates the device is within #{accuracy} meters of #{latitude},#{longitude}."
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      end
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    end
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  end
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end
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