standalone.py 文件源码

def _convert_and_validate(self, data):
        """Validate the value of supported challenges provided by the user.

        References to "dvsni" are automatically converted to "tls-sni-01".

        :param str data: comma delimited list of challenge types

        :returns: validated and converted list of challenge types
        :rtype: str

        """
        challs = data.split(",")

        # tls-sni-01 was dvsni during private beta
        if "dvsni" in challs:
            logger.info(
                "Updating legacy standalone_supported_challenges value")
            challs = [challenges.TLSSNI01.typ if chall == "dvsni" else chall
                      for chall in challs]
            data = ",".join(challs)

        unrecognized = [name for name in challs
                        if name not in challenges.Challenge.TYPES]

        # argparse.ArgumentErrors raised out of argparse.Action objects
        # are caught by argparse which prints usage information and the
        # error that occurred before calling sys.exit.
        if unrecognized:
            raise argparse.ArgumentError(
                self,
                "Unrecognized challenges: {0}".format(", ".join(unrecognized)))

        choices = set(chall.typ for chall in SUPPORTED_CHALLENGES)
        if not set(challs).issubset(choices):
            raise argparse.ArgumentError(
                self,
                "Plugin does not support the following (valid) "
                "challenges: {0}".format(", ".join(set(challs) - choices)))

        return data