gistfile1.txt

var fh = fh || {};
fh.oauth = function(url, cb){
  var browser = window.open(url, '_blank', 'location=yes');
  browser.addEventListener('loadstop', function(e){
    if (e.url.indexOf('/authed')>-1){
      browser.executeScript({
        code: "JSON.parse(document.body.querySelector('pre').textContent)"
      }, function(result) {
        // Result will be required oAuth creds
        browser.close();
        if (!result || result.length === 0 || !result[0].passport || !result[0].passport.user){
          return cb('Could not find authentication token details on response');
        }
        return cb(null, result[0].passport.user)
        
      });
    }
    if (e.url.indexOf('/error')>-1){
      browser.close();
      return cb('Error authenticating you over oAuth')
    }
  });
}