# Source code for certbot_dns_gehirn.dns_gehirn

    """DNS Authenticator for Gehirn Infrastracture Service DNS."""
    import logging

    import zope.interface
    from lexicon.providers import gehirn

    from certbot import interfaces
    from certbot.plugins import dns_common
    from certbot.plugins import dns_common_lexicon

    logger = logging.getLogger(__name__)

    DASHBOARD_URL = "https://gis.gehirn.jp/"

    @zope.interface.implementer(interfaces.IAuthenticator)
    @zope.interface.provider(interfaces.IPluginFactory)
    class Authenticator(dns_common.DNSAuthenticator):
        """DNS Authenticator for Gehirn Infrastracture Service DNS

        This Authenticator uses the Gehirn Infrastracture Service API to fulfill
        a dns-01 challenge.
        """

        description = 'Obtain certificates using a DNS TXT record ' + \
                      '(if you are using Gehirn Infrastracture Service for DNS).'
        ttl = 60

        def __init__(self, *args, **kwargs):
            super(Authenticator, self).__init__(*args, **kwargs)
            self.credentials = None

        @classmethod
        def add_parser_arguments(cls, add):  # pylint: disable=arguments-differ
            super(Authenticator, cls).add_parser_arguments(add, default_propagation_seconds=30)
            add('credentials', help='Gehirn Infrastracture Service credentials file.')

        def more_info(self):  # pylint: disable=missing-docstring,no-self-use
            return 'This plugin configures a DNS TXT record to respond to a dns-01 challenge using ' + \
                   'the Gehirn Infrastracture Service API.'

        def _setup_credentials(self):
            self.credentials = self._configure_credentials(
                'credentials',
                'Gehirn Infrastracture Service credentials file',
                {
                    'api-token': 'API token for Gehirn Infrastracture Service ' + \
                                 'API obtained from {0}'.format(DASHBOARD_URL),
                    'api-secret': 'API secret for Gehirn Infrastracture Service ' + \
                                  'API obtained from {0}'.format(DASHBOARD_URL),
                }
            )

        def _perform(self, domain, validation_name, validation):
            self._get_gehirn_client().add_txt_record(domain, validation_name, validation)

        def _cleanup(self, domain, validation_name, validation):
            self._get_gehirn_client().del_txt_record(domain, validation_name, validation)

        def _get_gehirn_client(self):
            return _GehirnLexiconClient(
                self.credentials.conf('api-token'),
                self.credentials.conf('api-secret'),
                self.ttl
            )

    class _GehirnLexiconClient(dns_common_lexicon.LexiconClient):
        """
        Encapsulates all communication with the Gehirn Infrastracture Service via Lexicon.
        """

        def __init__(self, api_token, api_secret, ttl):
            super(_GehirnLexiconClient, self).__init__()

            config = dns_common_lexicon.build_lexicon_config('gehirn', {
                'ttl': ttl,
            }, {
                'auth_token': api_token,
                'auth_secret': api_secret,
            })

            self.provider = gehirn.Provider(config)

        def _handle_http_error(self, e, domain_name):
            if domain_name in str(e) and (str(e).startswith('404 Client Error: Not Found for url:')):
                return  # Expected errors when zone name guess is wrong
            return super(_GehirnLexiconClient, self)._handle_http_error(e, domain_name)