file.py 文件源码

def _check_scheme(self, config):
        """
        check for a valid scheme

        raise ValueError otherwise
        raise AttributeError if missing
        """
        try:
            scheme = config.get(
                escape_for_ini('keyring-setting'),
                escape_for_ini('scheme'),
            )
        except (configparser.NoSectionError, configparser.NoOptionError):
            raise AttributeError("Encryption scheme missing")

        # remove pointless crypto module name
        if scheme.startswith('PyCrypto '):
            scheme = scheme[9:]

        if scheme != self.scheme:
            raise ValueError("Encryption scheme mismatch "
                             "(exp.: %s, found: %s)" % (self.scheme, scheme))