code: def login(self):
          
          log.debug('Logging into RightScale...')
          login_data = {
              'grant_type': 'refresh_token',
              'refresh_token': self.refresh_token,
              }
          response = self._request('post', self.oauth_path, data=login_data)
  
          raw_token = response.json()
          auth_token = "Bearer %s" % raw_token['access_token']
          self.s.headers['Authorization'] = auth_token
  
          # Generate an expiration time for our token of 60-seconds before the
          # standard time returned by RightScale. This will be used in the
          # self.client property to validate that our token is still usable on
          # every API call.
          log.debug('Auth Token expires in %s(s)' % raw_token['expires_in'])
          self.auth_expires_at = time.time() + int(raw_token['expires_in']) - 60
docs: Gets and stores an OAUTH token from Rightscale.