api_config_manager.py 文件源码

def _from_safe_path_param_name(safe_parameter):
    """Takes a safe regex group name and converts it back to the original value.

    Only alphanumeric characters and underscore are allowed in variable name
    tokens, and numeric are not allowed as the first character.

    The safe_parameter is a base32 representation of the actual value.

    Args:
      safe_parameter: A string that was generated by _to_safe_path_param_name.

    Returns:
      A string, the parameter matched from the URL template.
    """
    assert safe_parameter.startswith('_')
    safe_parameter_as_base32 = safe_parameter[1:]

    padding_length = - len(safe_parameter_as_base32) % 8
    padding = '=' * padding_length
    return base64.b32decode(safe_parameter_as_base32 + padding)