code: def get_friends_shake(self, before=None, after=None):
          
          if before and after:
              raise Exception("You cannot specify both before and after keys")
  
          endpoint = '/api/friends'
  
          if before:
              endpoint += '/before/{0}'.format(before)
          elif after:
              endpoint += '/after/{0}'.format(after)
  
          data = self._make_request("GET", endpoint=endpoint)
          return [SharedFile.NewFromJSON(sf) for sf in data['friend_shake']]
docs: Contrary to the endpoint naming, this resource is for a list of
          SharedFiles from your friends on mlkshk.
  
          Returns:
              List of SharedFiles.