code: def to_meta(self, md5=None, file=None):
          
          # from collections import OrderedDict
  
          if not md5:
              if not file:
                  raise ValueError('Must specify either file or md5')
  
              md5 = md5_for_file(file)
              size = os.stat(file).st_size
          else:
              size = None
  
          return {
              'id': self.id_,
              'identity': json.dumps(self.dict),
              'name': self.sname,
              'fqname': self.fqname,
              'md5': md5,
              # This causes errors with calculating the AWS signature
              'size': size
          }
docs: Return a dictionary of metadata, for use in the Remote api.