Source code for designate.objects.rrdata_txt

# Copyright (c) 2014 Rackspace Hosting
# All Rights Reserved.
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.
from designate.objects import base
from designate.objects import fields
from designate.objects.record import Record
from designate.objects.record import RecordList

[docs] @base.DesignateRegistry.register class TXT(Record): """ TXT Resource Record Type Defined in: RFC1035 """ fields = { 'txt_data': fields.TxtField() } @staticmethod def _is_wrapped_in_double_quotes(value): return value.startswith('"') and value.endswith('"') @staticmethod def _is_missing_double_quote(value): return ((value.startswith('"') and not value.endswith('"')) or (not value.startswith('"') and value.endswith('"'))) def _validate_record_single_string(self, value): if len(value) > 255: raise ValueError( 'Any TXT record string exceeding 255 characters has to be ' 'split.' ) if self._is_missing_double_quote(value): raise ValueError( 'TXT record is missing a double quote either at beginning ' 'or at end.' ) if not self._is_wrapped_in_double_quotes(value): # value with spaces should be quoted as per RFC1035 5.1 for element in value: if element.isspace(): raise ValueError( 'Empty spaces are not allowed in TXT record, ' 'unless wrapped in double quotes.' ) else: # quotes within value should be escaped with backslash strip_value = value.strip('"') for index, char in enumerate(strip_value): if char == '"': if strip_value[index - 1] != "\\": raise ValueError( 'Quotation marks should be escaped with backslash.' )
[docs] def from_string(self, value): if len(value) > 255: # expecting record containing multiple strings as # per rfc7208 3.3 and rfc1035 3.3.14 stripped_value = value.strip('"') if (not self._is_wrapped_in_double_quotes(value) and '" "' not in stripped_value): raise ValueError( 'TXT record strings over 255 characters have to be split ' 'into multiple strings wrapped in double quotes.' ) record_strings = stripped_value.split('" "') for record_string in record_strings: # add back the delimiting quotes after # strip and split for each string record_string = f'"{record_string}"' # further validate each string individually self._validate_record_single_string(value=record_string) else: # validate single TXT record string self._validate_record_single_string(value=value) self.txt_data = value
# The record type is defined in the RFC. This will be used when the record # is sent by mini-dns. RECORD_TYPE = 16
[docs] @base.DesignateRegistry.register class TXTList(RecordList): LIST_ITEM_TYPE = TXT fields = { 'objects': fields.ListOfObjectsField('TXT'), }