/
dns_dynu.py
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/
dns_dynu.py
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"""DNS Authenticator for Dynu."""
import logging
import zope.interface
from certbot import interfaces
from certbot import errors
from certbot.plugins import dns_common
from certbot.plugins import dns_common_lexicon
from lexicon.providers import dynu
logger = logging.getLogger(__name__)
@zope.interface.implementer(interfaces.IAuthenticator)
@zope.interface.provider(interfaces.IPluginFactory)
class Authenticator(dns_common.DNSAuthenticator):
"""DNS Authenticator for Dynu."""
description = 'Obtain certificates using a DNS TXT record ' + \
'(if you are using Dynu 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):
super(Authenticator, cls).add_parser_arguments(
add, default_propagation_seconds=60)
add("credentials", help="Dynu 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 ' + \
'Dynu API'
def _setup_credentials(self):
self._configure_file('credentials',
'Absolute path to Dynu credentials file')
dns_common.validate_file_permissions(self.conf('credentials'))
self.credentials = self._configure_credentials(
'credentials',
'Dynu credentials file',
{
'auth-token': 'Dynu-compatible API key (API-Key)',
}
)
def _perform(self, domain, validation_name, validation):
self._get_dynu_client().add_txt_record(
domain, validation_name, validation)
def _cleanup(self, domain, validation_name, validation):
self._get_dynu_client().del_txt_record(
domain, validation_name, validation)
def _get_dynu_client(self):
return _DynuLexiconClient(
self.credentials.conf('auth-token'),
self.ttl
)
class _DynuLexiconClient(dns_common_lexicon.LexiconClient):
"""
Encapsulates all communication with the Dynu via Lexicon.
"""
def __init__(self, auth_token, ttl):
super(_DynuLexiconClient, self).__init__()
config = dns_common_lexicon.build_lexicon_config('dynu', {
'ttl': ttl,
}, {
'auth_token': auth_token,
})
self.provider = dynu.Provider(config)
def _handle_http_error(self, e, domain_name):
if domain_name in str(e) and (
# 4.0 and 4.1 compatibility
str(e).startswith('422 Client Error: Unprocessable Entity for url:') or
# 4.2
str(e).startswith('404 Client Error: Not Found for url:')
):
return # Expected errors when zone name guess is wrong
return super(_DynuLexiconClient, self)._handle_http_error(e, domain_name)