99 lines
3.6 KiB
Python
99 lines
3.6 KiB
Python
# 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
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# 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.exceptions import InvalidObject
|
|
from designate.objects import base
|
|
from designate.objects import fields
|
|
from designate.objects.record import Record
|
|
from designate.objects.record import RecordList
|
|
|
|
|
|
@base.DesignateRegistry.register
|
|
class TXT(Record):
|
|
"""
|
|
TXT Resource Record Type
|
|
Defined in: RFC1035
|
|
"""
|
|
fields = {
|
|
'txt_data': fields.TxtField()
|
|
}
|
|
|
|
def _to_string(self):
|
|
return self.txt_data
|
|
|
|
@staticmethod
|
|
def _is_wrapped_in_double_quotes(value):
|
|
return value.startswith('"') and value.endswith('"')
|
|
|
|
def _validate_record_single_string(self, value):
|
|
if len(value) > 255:
|
|
err = ("Any TXT record string exceeding "
|
|
"255 characters has to be split.")
|
|
raise InvalidObject(err)
|
|
|
|
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():
|
|
err = ("Empty spaces are not allowed in TXT record, "
|
|
"unless wrapped in double quotes.")
|
|
raise InvalidObject(err)
|
|
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] != "\\":
|
|
err = ("Quotation marks should be escaped with "
|
|
"backslash.")
|
|
raise InvalidObject(err)
|
|
|
|
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):
|
|
err = ("TXT record strings over 255 characters "
|
|
"have to be split into multiple strings "
|
|
"wrapped in double quotes.")
|
|
raise InvalidObject(err)
|
|
|
|
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 = '"{}"'.format(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
|
|
|
|
|
|
@base.DesignateRegistry.register
|
|
class TXTList(RecordList):
|
|
|
|
LIST_ITEM_TYPE = TXT
|
|
fields = {
|
|
'objects': fields.ListOfObjectsField('TXT'),
|
|
}
|