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dnskeybase.py	2.79 MB	View DL Edit
dsbase.py	3.35 MB	View DL Edit
euibase.py	2.57 MB	View DL Edit
mxbase.py	3.12 MB	View DL Edit
nsbase.py	2.27 MB	View DL Edit
svcbbase.py	16.28 MB	View DL Edit
tlsabase.py	2.54 MB	View DL Edit
txtbase.py	3.52 MB	View DL Edit
util.py	8.79 MB	View DL Edit
__init__.py	1.05 MB	View DL Edit

Edit file: /lib/python3.9/site-packages/dns/rdtypes/txtbase.py

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# Copyright (C) 2006-2017 Nominum, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

"""TXT-like base class."""

from typing import Any, Dict, Iterable, Optional, Tuple, Union

import dns.exception
import dns.immutable
import dns.rdata
import dns.renderer
import dns.tokenizer

@dns.immutable.immutable
class TXTBase(dns.rdata.Rdata):
    """Base class for rdata that is like a TXT record (see RFC 1035)."""

__slots__ = ["strings"]

def __init__(
        self,
        rdclass: dns.rdataclass.RdataClass,
        rdtype: dns.rdatatype.RdataType,
        strings: Iterable[Union[bytes, str]],
    ):
        """Initialize a TXT-like rdata.

*rdclass*, an ``int`` is the rdataclass of the Rdata.

*rdtype*, an ``int`` is the rdatatype of the Rdata.

*strings*, a tuple of ``bytes``
        """
        super().__init__(rdclass, rdtype)
        self.strings: Tuple[bytes] = self._as_tuple(
            strings, lambda x: self._as_bytes(x, True, 255)
        )

def to_text(
        self,
        origin: Optional[dns.name.Name] = None,
        relativize: bool = True,
        **kw: Dict[str, Any],
    ) -> str:
        txt = ""
        prefix = ""
        for s in self.strings:
            txt += '{}"{}"'.format(prefix, dns.rdata._escapify(s))
            prefix = " "
        return txt

@classmethod
    def from_text(
        cls,
        rdclass: dns.rdataclass.RdataClass,
        rdtype: dns.rdatatype.RdataType,
        tok: dns.tokenizer.Tokenizer,
        origin: Optional[dns.name.Name] = None,
        relativize: bool = True,
        relativize_to: Optional[dns.name.Name] = None,
    ) -> dns.rdata.Rdata:
        strings = []
        for token in tok.get_remaining():
            token = token.unescape_to_bytes()
            # The 'if' below is always true in the current code, but we
            # are leaving this check in in case things change some day.
            if not (
                token.is_quoted_string() or token.is_identifier()
            ):  # pragma: no cover
                raise dns.exception.SyntaxError("expected a string")
            if len(token.value) > 255:
                raise dns.exception.SyntaxError("string too long")
            strings.append(token.value)
        if len(strings) == 0:
            raise dns.exception.UnexpectedEnd
        return cls(rdclass, rdtype, strings)

def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
        for s in self.strings:
            with dns.renderer.prefixed_length(file, 1):
                file.write(s)

@classmethod
    def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
        strings = []
        while parser.remaining() > 0:
            s = parser.get_counted_bytes()
            strings.append(s)
        return cls(rdclass, rdtype, strings)

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