code: def _readContents(self, jobStoreID):
          
          job = self.bucket.get_blob(bytes(jobStoreID), encryption_key=self.sseKey)
          if job is None:
              raise NoSuchJobException(jobStoreID)
          return job.download_as_string()
docs: To be used on files representing jobs only. Which will be encrypted if possible.
          :param jobStoreID: the ID of the job
          :type jobStoreID: str
          :return: contents of the job file
          :rtype: string