docs: def get_shared_file(self, sharekey=None):
          """
          Returns a SharedFile object given by the sharekey.
  
          Args:
              sharekey (str): Sharekey of the SharedFile you want to retrieve.
  
          Returns:
              SharedFile
          """
          if not sharekey:
              raise Exception("You must specify a sharekey.")
          endpoint = '/api/sharedfile/{0}'.format(sharekey)
          data = self._make_request('GET', endpoint)
          return SharedFile.NewFromJSON(data)