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__init__.py	file	1,073 B	0644	2024-07-08 00:00:00	edit
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svcbbase.py	file	16,674 B	0644	2024-07-08 00:00:00	edit
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editing: tlsabase.py

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

# Copyright (C) 2005-2007, 2009-2011 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.

import binascii
import struct

import dns.immutable
import dns.rdata
import dns.rdatatype

@dns.immutable.immutable
class TLSABase(dns.rdata.Rdata):
    """Base class for TLSA and SMIMEA records"""

# see: RFC 6698

__slots__ = ["usage", "selector", "mtype", "cert"]

def __init__(self, rdclass, rdtype, usage, selector, mtype, cert):
        super().__init__(rdclass, rdtype)
        self.usage = self._as_uint8(usage)
        self.selector = self._as_uint8(selector)
        self.mtype = self._as_uint8(mtype)
        self.cert = self._as_bytes(cert)

def to_text(self, origin=None, relativize=True, **kw):
        kw = kw.copy()
        chunksize = kw.pop("chunksize", 128)
        return "%d %d %d %s" % (
            self.usage,
            self.selector,
            self.mtype,
            dns.rdata._hexify(self.cert, chunksize=chunksize, **kw),
        )

@classmethod
    def from_text(
        cls, rdclass, rdtype, tok, origin=None, relativize=True, relativize_to=None
    ):
        usage = tok.get_uint8()
        selector = tok.get_uint8()
        mtype = tok.get_uint8()
        cert = tok.concatenate_remaining_identifiers().encode()
        cert = binascii.unhexlify(cert)
        return cls(rdclass, rdtype, usage, selector, mtype, cert)

def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
        header = struct.pack("!BBB", self.usage, self.selector, self.mtype)
        file.write(header)
        file.write(self.cert)

@classmethod
    def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
        header = parser.get_struct("BBB")
        cert = parser.get_remaining()
        return cls(rdclass, rdtype, header[0], header[1], header[2], cert)

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