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"""Common code for DNS Authenticator Plugins built on Lexicon."""
import logging
from requests.exceptions import HTTPError, RequestException
from acme.magic_typing import Union, Dict, Any # pylint: disable=unused-import,no-name-in-module
from certbot import errors
from certbot.plugins import dns_common
# Lexicon is not declared as a dependency in Certbot itself,
# but in the Certbot plugins backed by Lexicon.
# So we catch import error here to allow this module to be
# always importable, even if it does not make sense to use it
# if Lexicon is not available, obviously.
try:
from lexicon.config import ConfigResolver
except ImportError:
ConfigResolver = None # type: ignore
logger = logging.getLogger(__name__)
class LexiconClient(object):
"""
Encapsulates all communication with a DNS provider via Lexicon.
"""
def __init__(self):
self.provider = None
def add_txt_record(self, domain, record_name, record_content):
"""
Add a TXT record using the supplied information.
:param str domain: The domain to use to look up the managed zone.
:param str record_name: The record name (typically beginning with '_acme-challenge.').
:param str record_content: The record content (typically the challenge validation).
:raises errors.PluginError: if an error occurs communicating with the DNS Provider API
"""
self._find_domain_id(domain)
try:
self.provider.create_record(type='TXT', name=record_name, content=record_content)
except RequestException as e:
logger.debug('Encountered error adding TXT record: %s', e, exc_info=True)
raise errors.PluginError('Error adding TXT record: {0}'.format(e))
def del_txt_record(self, domain, record_name, record_content):
"""
Delete a TXT record using the supplied information.
:param str domain: The domain to use to look up the managed zone.
:param str record_name: The record name (typically beginning with '_acme-challenge.').
:param str record_content: The record content (typically the challenge validation).
:raises errors.PluginError: if an error occurs communicating with the DNS Provider API
"""
try:
self._find_domain_id(domain)
except errors.PluginError as e:
logger.debug('Encountered error finding domain_id during deletion: %s', e,
exc_info=True)
return
try:
self.provider.delete_record(type='TXT', name=record_name, content=record_content)
except RequestException as e:
logger.debug('Encountered error deleting TXT record: %s', e, exc_info=True)
def _find_domain_id(self, domain):
"""
Find the domain_id for a given domain.
:param str domain: The domain for which to find the domain_id.
:raises errors.PluginError: if the domain_id cannot be found.
"""
domain_name_guesses = dns_common.base_domain_name_guesses(domain)
for domain_name in domain_name_guesses:
try:
if hasattr(self.provider, 'options'):
# For Lexicon 2.x
self.provider.options['domain'] = domain_name
else:
# For Lexicon 3.x
self.provider.domain = domain_name
self.provider.authenticate()
return # If `authenticate` doesn't throw an exception, we've found the right name
except HTTPError as e:
result = self._handle_http_error(e, domain_name)
if result:
raise result
except Exception as e: # pylint: disable=broad-except
result = self._handle_general_error(e, domain_name)
if result:
raise result
raise errors.PluginError('Unable to determine zone identifier for {0} using zone names: {1}'
.format(domain, domain_name_guesses))
def _handle_http_error(self, e, domain_name):
return errors.PluginError('Error determining zone identifier for {0}: {1}.'
.format(domain_name, e))
def _handle_general_error(self, e, domain_name):
if not str(e).startswith('No domain found'):
return errors.PluginError('Unexpected error determining zone identifier for {0}: {1}'
.format(domain_name, e))
def build_lexicon_config(lexicon_provider_name, lexicon_options, provider_options):
# type: (str, Dict, Dict) -> Union[ConfigResolver, Dict]
"""
Convenient function to build a Lexicon 2.x/3.x config object.
:param str lexicon_provider_name: the name of the lexicon provider to use
:param dict lexicon_options: options specific to lexicon
:param dict provider_options: options specific to provider
:return: configuration to apply to the provider
:rtype: ConfigurationResolver or dict
"""
config = {'provider_name': lexicon_provider_name} # type: Dict[str, Any]
config.update(lexicon_options)
if not ConfigResolver:
# Lexicon 2.x
config.update(provider_options)
else:
# Lexicon 3.x
provider_config = {}
provider_config.update(provider_options)
config[lexicon_provider_name] = provider_config
config = ConfigResolver().with_dict(config).with_env()
return config
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