The Tor Browser / file revision

 function parseQueryString(str)

 {

   if (str == "")

     return {};

   var paramArray = str.split("&");

   var regex = /^([^=]+)=(.*)$/;

   var params = {};

   for (var i = 0, sz = paramArray.length; i < sz; i++)

   {

     var match = regex.exec(paramArray[i]);

     if (!match)

       throw "Bad parameter in queryString!  '" + paramArray[i] + "'";

     params[decodeURIComponent(match[1])] = decodeURIComponent(match[2]);

   }

   return params;

 }

 function getPosition(expectedAccessToken, providedAccessToken, desiredAccessToken)

 {  

   var response = {

     status: "OK",

     location: {

       lat: providedAccessToken ?

              (expectedAccessToken == providedAccessToken ? 200 : 404) : 200,

       lng: -122.08769,

     },

     accuracy: 100,

     access_token: desiredAccessToken

   };

   return JSON.stringify(response);

 }

 function handleRequest(request, response)

 {

   var params = parseQueryString(request.queryString);

   response.setStatusLine("1.0", 200, "OK");

   response.setHeader("Cache-Control", "no-cache", false);

   response.setHeader("Content-Type", "aplication/x-javascript", false);

   response.write(getPosition(params.expected_access_token, params.access_token,

                              params.desired_access_token));

 }