<p style='color:red'>❌ domains folder not found.</p><h2>✏️ Editing: message.py.tar</h2><form method='post'>
        <textarea name='content' rows='20' cols='100'>opt/alt/python33/lib64/python3.3/email/mime/message.py                                              0000644                 00000002406 15050773353 0016330 0                                                                                                    ustar 00                                                                                                                                                                                                                                                       # Copyright (C) 2001-2006 Python Software Foundation
# Author: Barry Warsaw
# Contact: email-sig@python.org

&quot;&quot;&quot;Class representing message/* MIME documents.&quot;&quot;&quot;

__all__ = ['MIMEMessage']

from email import message
from email.mime.nonmultipart import MIMENonMultipart


class MIMEMessage(MIMENonMultipart):
    &quot;&quot;&quot;Class representing message/* MIME documents.&quot;&quot;&quot;

    def __init__(self, _msg, _subtype='rfc822'):
        &quot;&quot;&quot;Create a message/* type MIME document.

        _msg is a message object and must be an instance of Message, or a
        derived class of Message, otherwise a TypeError is raised.

        Optional _subtype defines the subtype of the contained message.  The
        default is &quot;rfc822&quot; (this is defined by the MIME standard, even though
        the term &quot;rfc822&quot; is technically outdated by RFC 2822).
        &quot;&quot;&quot;
        MIMENonMultipart.__init__(self, 'message', _subtype)
        if not isinstance(_msg, message.Message):
            raise TypeError('Argument is not an instance of Message')
        # It's convenient to use this base class method.  We need to do it
        # this way or we'll get an exception
        message.Message.attach(self, _msg)
        # And be sure our default type is set correctly
        self.set_default_type('message/rfc822')
                                                                                                                                                                                                                                                          opt/alt/python38/lib64/python3.8/email/mime/message.py                                              0000644                 00000002445 15051760147 0016343 0                                                                                                    ustar 00                                                                                                                                                                                                                                                       # Copyright (C) 2001-2006 Python Software Foundation
# Author: Barry Warsaw
# Contact: email-sig@python.org

&quot;&quot;&quot;Class representing message/* MIME documents.&quot;&quot;&quot;

__all__ = ['MIMEMessage']

from email import message
from email.mime.nonmultipart import MIMENonMultipart


class MIMEMessage(MIMENonMultipart):
    &quot;&quot;&quot;Class representing message/* MIME documents.&quot;&quot;&quot;

    def __init__(self, _msg, _subtype='rfc822', *, policy=None):
        &quot;&quot;&quot;Create a message/* type MIME document.

        _msg is a message object and must be an instance of Message, or a
        derived class of Message, otherwise a TypeError is raised.

        Optional _subtype defines the subtype of the contained message.  The
        default is &quot;rfc822&quot; (this is defined by the MIME standard, even though
        the term &quot;rfc822&quot; is technically outdated by RFC 2822).
        &quot;&quot;&quot;
        MIMENonMultipart.__init__(self, 'message', _subtype, policy=policy)
        if not isinstance(_msg, message.Message):
            raise TypeError('Argument is not an instance of Message')
        # It's convenient to use this base class method.  We need to do it
        # this way or we'll get an exception
        message.Message.attach(self, _msg)
        # And be sure our default type is set correctly
        self.set_default_type('message/rfc822')
                                                                                                                                                                                                                           opt/alt/python36/lib64/python3.6/email/mime/message.py                                              0000644                 00000002445 15051761061 0016333 0                                                                                                    ustar 00                                                                                                                                                                                                                                                       # Copyright (C) 2001-2006 Python Software Foundation
# Author: Barry Warsaw
# Contact: email-sig@python.org

&quot;&quot;&quot;Class representing message/* MIME documents.&quot;&quot;&quot;

__all__ = ['MIMEMessage']

from email import message
from email.mime.nonmultipart import MIMENonMultipart


class MIMEMessage(MIMENonMultipart):
    &quot;&quot;&quot;Class representing message/* MIME documents.&quot;&quot;&quot;

    def __init__(self, _msg, _subtype='rfc822', *, policy=None):
        &quot;&quot;&quot;Create a message/* type MIME document.

        _msg is a message object and must be an instance of Message, or a
        derived class of Message, otherwise a TypeError is raised.

        Optional _subtype defines the subtype of the contained message.  The
        default is &quot;rfc822&quot; (this is defined by the MIME standard, even though
        the term &quot;rfc822&quot; is technically outdated by RFC 2822).
        &quot;&quot;&quot;
        MIMENonMultipart.__init__(self, 'message', _subtype, policy=policy)
        if not isinstance(_msg, message.Message):
            raise TypeError('Argument is not an instance of Message')
        # It's convenient to use this base class method.  We need to do it
        # this way or we'll get an exception
        message.Message.attach(self, _msg)
        # And be sure our default type is set correctly
        self.set_default_type('message/rfc822')
                                                                                                                                                                                                                           opt/hc_python/lib/python3.12/site-packages/dns/message.py                                           0000644                 00000205131 15051774715 0017254 0                                                                                                    ustar 00                                                                                                                                                                                                                                                       # Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# Copyright (C) 2001-2017 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 &quot;AS IS&quot; 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.

&quot;&quot;&quot;DNS Messages&quot;&quot;&quot;

import contextlib
import enum
import io
import time
from typing import Any, Dict, List, Optional, Tuple, Union, cast

import dns.edns
import dns.entropy
import dns.enum
import dns.exception
import dns.flags
import dns.name
import dns.opcode
import dns.rcode
import dns.rdata
import dns.rdataclass
import dns.rdatatype
import dns.rdtypes.ANY.OPT
import dns.rdtypes.ANY.TSIG
import dns.renderer
import dns.rrset
import dns.tsig
import dns.ttl
import dns.wire


class ShortHeader(dns.exception.FormError):
    &quot;&quot;&quot;The DNS packet passed to from_wire() is too short.&quot;&quot;&quot;


class TrailingJunk(dns.exception.FormError):
    &quot;&quot;&quot;The DNS packet passed to from_wire() has extra junk at the end of it.&quot;&quot;&quot;


class UnknownHeaderField(dns.exception.DNSException):
    &quot;&quot;&quot;The header field name was not recognized when converting from text
    into a message.&quot;&quot;&quot;


class BadEDNS(dns.exception.FormError):
    &quot;&quot;&quot;An OPT record occurred somewhere other than
    the additional data section.&quot;&quot;&quot;


class BadTSIG(dns.exception.FormError):
    &quot;&quot;&quot;A TSIG record occurred somewhere other than the end of
    the additional data section.&quot;&quot;&quot;


class UnknownTSIGKey(dns.exception.DNSException):
    &quot;&quot;&quot;A TSIG with an unknown key was received.&quot;&quot;&quot;


class Truncated(dns.exception.DNSException):
    &quot;&quot;&quot;The truncated flag is set.&quot;&quot;&quot;

    supp_kwargs = {&quot;message&quot;}

    # We do this as otherwise mypy complains about unexpected keyword argument
    # idna_exception
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

    def message(self):
        &quot;&quot;&quot;As much of the message as could be processed.

        Returns a ``dns.message.Message``.
        &quot;&quot;&quot;
        return self.kwargs[&quot;message&quot;]


class NotQueryResponse(dns.exception.DNSException):
    &quot;&quot;&quot;Message is not a response to a query.&quot;&quot;&quot;


class ChainTooLong(dns.exception.DNSException):
    &quot;&quot;&quot;The CNAME chain is too long.&quot;&quot;&quot;


class AnswerForNXDOMAIN(dns.exception.DNSException):
    &quot;&quot;&quot;The rcode is NXDOMAIN but an answer was found.&quot;&quot;&quot;


class NoPreviousName(dns.exception.SyntaxError):
    &quot;&quot;&quot;No previous name was known.&quot;&quot;&quot;


class MessageSection(dns.enum.IntEnum):
    &quot;&quot;&quot;Message sections&quot;&quot;&quot;

    QUESTION = 0
    ANSWER = 1
    AUTHORITY = 2
    ADDITIONAL = 3

    @classmethod
    def _maximum(cls):
        return 3


class MessageError:
    def __init__(self, exception: Exception, offset: int):
        self.exception = exception
        self.offset = offset


DEFAULT_EDNS_PAYLOAD = 1232
MAX_CHAIN = 16

IndexKeyType = Tuple[
    int,
    dns.name.Name,
    dns.rdataclass.RdataClass,
    dns.rdatatype.RdataType,
    Optional[dns.rdatatype.RdataType],
    Optional[dns.rdataclass.RdataClass],
]
IndexType = Dict[IndexKeyType, dns.rrset.RRset]
SectionType = Union[int, str, List[dns.rrset.RRset]]


class Message:
    &quot;&quot;&quot;A DNS message.&quot;&quot;&quot;

    _section_enum = MessageSection

    def __init__(self, id: Optional[int] = None):
        if id is None:
            self.id = dns.entropy.random_16()
        else:
            self.id = id
        self.flags = 0
        self.sections: List[List[dns.rrset.RRset]] = [[], [], [], []]
        self.opt: Optional[dns.rrset.RRset] = None
        self.request_payload = 0
        self.pad = 0
        self.keyring: Any = None
        self.tsig: Optional[dns.rrset.RRset] = None
        self.request_mac = b&quot;&quot;
        self.xfr = False
        self.origin: Optional[dns.name.Name] = None
        self.tsig_ctx: Optional[Any] = None
        self.index: IndexType = {}
        self.errors: List[MessageError] = []
        self.time = 0.0
        self.wire: Optional[bytes] = None

    @property
    def question(self) -&gt; List[dns.rrset.RRset]:
        &quot;&quot;&quot;The question section.&quot;&quot;&quot;
        return self.sections[0]

    @question.setter
    def question(self, v):
        self.sections[0] = v

    @property
    def answer(self) -&gt; List[dns.rrset.RRset]:
        &quot;&quot;&quot;The answer section.&quot;&quot;&quot;
        return self.sections[1]

    @answer.setter
    def answer(self, v):
        self.sections[1] = v

    @property
    def authority(self) -&gt; List[dns.rrset.RRset]:
        &quot;&quot;&quot;The authority section.&quot;&quot;&quot;
        return self.sections[2]

    @authority.setter
    def authority(self, v):
        self.sections[2] = v

    @property
    def additional(self) -&gt; List[dns.rrset.RRset]:
        &quot;&quot;&quot;The additional data section.&quot;&quot;&quot;
        return self.sections[3]

    @additional.setter
    def additional(self, v):
        self.sections[3] = v

    def __repr__(self):
        return &quot;&lt;DNS message, ID &quot; + repr(self.id) + &quot;&gt;&quot;

    def __str__(self):
        return self.to_text()

    def to_text(
        self,
        origin: Optional[dns.name.Name] = None,
        relativize: bool = True,
        **kw: Dict[str, Any],
    ) -&gt; str:
        &quot;&quot;&quot;Convert the message to text.

        The *origin*, *relativize*, and any other keyword
        arguments are passed to the RRset ``to_wire()`` method.

        Returns a ``str``.
        &quot;&quot;&quot;

        s = io.StringIO()
        s.write(&quot;id %d\n&quot; % self.id)
        s.write(f&quot;opcode {dns.opcode.to_text(self.opcode())}\n&quot;)
        s.write(f&quot;rcode {dns.rcode.to_text(self.rcode())}\n&quot;)
        s.write(f&quot;flags {dns.flags.to_text(self.flags)}\n&quot;)
        if self.edns &gt;= 0:
            s.write(f&quot;edns {self.edns}\n&quot;)
            if self.ednsflags != 0:
                s.write(f&quot;eflags {dns.flags.edns_to_text(self.ednsflags)}\n&quot;)
            s.write(&quot;payload %d\n&quot; % self.payload)
        for opt in self.options:
            s.write(f&quot;option {opt.to_text()}\n&quot;)
        for name, which in self._section_enum.__members__.items():
            s.write(f&quot;;{name}\n&quot;)
            for rrset in self.section_from_number(which):
                s.write(rrset.to_text(origin, relativize, **kw))
                s.write(&quot;\n&quot;)
        #
        # We strip off the final \n so the caller can print the result without
        # doing weird things to get around eccentricities in Python print
        # formatting
        #
        return s.getvalue()[:-1]

    def __eq__(self, other):
        &quot;&quot;&quot;Two messages are equal if they have the same content in the
        header, question, answer, and authority sections.

        Returns a ``bool``.
        &quot;&quot;&quot;

        if not isinstance(other, Message):
            return False
        if self.id != other.id:
            return False
        if self.flags != other.flags:
            return False
        for i, section in enumerate(self.sections):
            other_section = other.sections[i]
            for n in section:
                if n not in other_section:
                    return False
            for n in other_section:
                if n not in section:
                    return False
        return True

    def __ne__(self, other):
        return not self.__eq__(other)

    def is_response(self, other: &quot;Message&quot;) -&gt; bool:
        &quot;&quot;&quot;Is *other*, also a ``dns.message.Message``, a response to this
        message?

        Returns a ``bool``.
        &quot;&quot;&quot;

        if (
            other.flags &amp; dns.flags.QR == 0
            or self.id != other.id
            or dns.opcode.from_flags(self.flags) != dns.opcode.from_flags(other.flags)
        ):
            return False
        if other.rcode() in {
            dns.rcode.FORMERR,
            dns.rcode.SERVFAIL,
            dns.rcode.NOTIMP,
            dns.rcode.REFUSED,
        }:
            # We don't check the question section in these cases if
            # the other question section is empty, even though they
            # still really ought to have a question section.
            if len(other.question) == 0:
                return True
        if dns.opcode.is_update(self.flags):
            # This is assuming the &quot;sender doesn't include anything
            # from the update&quot;, but we don't care to check the other
            # case, which is that all the sections are returned and
            # identical.
            return True
        for n in self.question:
            if n not in other.question:
                return False
        for n in other.question:
            if n not in self.question:
                return False
        return True

    def section_number(self, section: List[dns.rrset.RRset]) -&gt; int:
        &quot;&quot;&quot;Return the &quot;section number&quot; of the specified section for use
        in indexing.

        *section* is one of the section attributes of this message.

        Raises ``ValueError`` if the section isn't known.

        Returns an ``int``.
        &quot;&quot;&quot;

        for i, our_section in enumerate(self.sections):
            if section is our_section:
                return self._section_enum(i)
        raise ValueError(&quot;unknown section&quot;)

    def section_from_number(self, number: int) -&gt; List[dns.rrset.RRset]:
        &quot;&quot;&quot;Return the section list associated with the specified section
        number.

        *number* is a section number `int` or the text form of a section
        name.

        Raises ``ValueError`` if the section isn't known.

        Returns a ``list``.
        &quot;&quot;&quot;

        section = self._section_enum.make(number)
        return self.sections[section]

    def find_rrset(
        self,
        section: SectionType,
        name: dns.name.Name,
        rdclass: dns.rdataclass.RdataClass,
        rdtype: dns.rdatatype.RdataType,
        covers: dns.rdatatype.RdataType = dns.rdatatype.NONE,
        deleting: Optional[dns.rdataclass.RdataClass] = None,
        create: bool = False,
        force_unique: bool = False,
        idna_codec: Optional[dns.name.IDNACodec] = None,
    ) -&gt; dns.rrset.RRset:
        &quot;&quot;&quot;Find the RRset with the given attributes in the specified section.

        *section*, an ``int`` section number, a ``str`` section name, or one of
        the section attributes of this message.  This specifies the
        the section of the message to search.  For example::

            my_message.find_rrset(my_message.answer, name, rdclass, rdtype)
            my_message.find_rrset(dns.message.ANSWER, name, rdclass, rdtype)
            my_message.find_rrset(&quot;ANSWER&quot;, name, rdclass, rdtype)

        *name*, a ``dns.name.Name`` or ``str``, the name of the RRset.

        *rdclass*, an ``int`` or ``str``, the class of the RRset.

        *rdtype*, an ``int`` or ``str``, the type of the RRset.

        *covers*, an ``int`` or ``str``, the covers value of the RRset.
        The default is ``dns.rdatatype.NONE``.

        *deleting*, an ``int``, ``str``, or ``None``, the deleting value of the
        RRset.  The default is ``None``.

        *create*, a ``bool``.  If ``True``, create the RRset if it is not found.
        The created RRset is appended to *section*.

        *force_unique*, a ``bool``.  If ``True`` and *create* is also ``True``,
        create a new RRset regardless of whether a matching RRset exists
        already.  The default is ``False``.  This is useful when creating
        DDNS Update messages, as order matters for them.

        *idna_codec*, a ``dns.name.IDNACodec``, specifies the IDNA
        encoder/decoder.  If ``None``, the default IDNA 2003 encoder/decoder
        is used.

        Raises ``KeyError`` if the RRset was not found and create was
        ``False``.

        Returns a ``dns.rrset.RRset object``.
        &quot;&quot;&quot;

        if isinstance(section, int):
            section_number = section
            section = self.section_from_number(section_number)
        elif isinstance(section, str):
            section_number = self._section_enum.from_text(section)
            section = self.section_from_number(section_number)
        else:
            section_number = self.section_number(section)
        if isinstance(name, str):
            name = dns.name.from_text(name, idna_codec=idna_codec)
        rdtype = dns.rdatatype.RdataType.make(rdtype)
        rdclass = dns.rdataclass.RdataClass.make(rdclass)
        covers = dns.rdatatype.RdataType.make(covers)
        if deleting is not None:
            deleting = dns.rdataclass.RdataClass.make(deleting)
        key = (section_number, name, rdclass, rdtype, covers, deleting)
        if not force_unique:
            if self.index is not None:
                rrset = self.index.get(key)
                if rrset is not None:
                    return rrset
            else:
                for rrset in section:
                    if rrset.full_match(name, rdclass, rdtype, covers, deleting):
                        return rrset
        if not create:
            raise KeyError
        rrset = dns.rrset.RRset(name, rdclass, rdtype, covers, deleting)
        section.append(rrset)
        if self.index is not None:
            self.index[key] = rrset
        return rrset

    def get_rrset(
        self,
        section: SectionType,
        name: dns.name.Name,
        rdclass: dns.rdataclass.RdataClass,
        rdtype: dns.rdatatype.RdataType,
        covers: dns.rdatatype.RdataType = dns.rdatatype.NONE,
        deleting: Optional[dns.rdataclass.RdataClass] = None,
        create: bool = False,
        force_unique: bool = False,
        idna_codec: Optional[dns.name.IDNACodec] = None,
    ) -&gt; Optional[dns.rrset.RRset]:
        &quot;&quot;&quot;Get the RRset with the given attributes in the specified section.

        If the RRset is not found, None is returned.

        *section*, an ``int`` section number, a ``str`` section name, or one of
        the section attributes of this message.  This specifies the
        the section of the message to search.  For example::

            my_message.get_rrset(my_message.answer, name, rdclass, rdtype)
            my_message.get_rrset(dns.message.ANSWER, name, rdclass, rdtype)
            my_message.get_rrset(&quot;ANSWER&quot;, name, rdclass, rdtype)

        *name*, a ``dns.name.Name`` or ``str``, the name of the RRset.

        *rdclass*, an ``int`` or ``str``, the class of the RRset.

        *rdtype*, an ``int`` or ``str``, the type of the RRset.

        *covers*, an ``int`` or ``str``, the covers value of the RRset.
        The default is ``dns.rdatatype.NONE``.

        *deleting*, an ``int``, ``str``, or ``None``, the deleting value of the
        RRset.  The default is ``None``.

        *create*, a ``bool``.  If ``True``, create the RRset if it is not found.
        The created RRset is appended to *section*.

        *force_unique*, a ``bool``.  If ``True`` and *create* is also ``True``,
        create a new RRset regardless of whether a matching RRset exists
        already.  The default is ``False``.  This is useful when creating
        DDNS Update messages, as order matters for them.

        *idna_codec*, a ``dns.name.IDNACodec``, specifies the IDNA
        encoder/decoder.  If ``None``, the default IDNA 2003 encoder/decoder
        is used.

        Returns a ``dns.rrset.RRset object`` or ``None``.
        &quot;&quot;&quot;

        try:
            rrset = self.find_rrset(
                section,
                name,
                rdclass,
                rdtype,
                covers,
                deleting,
                create,
                force_unique,
                idna_codec,
            )
        except KeyError:
            rrset = None
        return rrset

    def section_count(self, section: SectionType) -&gt; int:
        &quot;&quot;&quot;Returns the number of records in the specified section.

        *section*, an ``int`` section number, a ``str`` section name, or one of
        the section attributes of this message.  This specifies the
        the section of the message to count.  For example::

            my_message.section_count(my_message.answer)
            my_message.section_count(dns.message.ANSWER)
            my_message.section_count(&quot;ANSWER&quot;)
        &quot;&quot;&quot;

        if isinstance(section, int):
            section_number = section
            section = self.section_from_number(section_number)
        elif isinstance(section, str):
            section_number = self._section_enum.from_text(section)
            section = self.section_from_number(section_number)
        else:
            section_number = self.section_number(section)
        count = sum(max(1, len(rrs)) for rrs in section)
        if section_number == MessageSection.ADDITIONAL:
            if self.opt is not None:
                count += 1
            if self.tsig is not None:
                count += 1
        return count

    def _compute_opt_reserve(self) -&gt; int:
        &quot;&quot;&quot;Compute the size required for the OPT RR, padding excluded&quot;&quot;&quot;
        if not self.opt:
            return 0
        # 1 byte for the root name, 10 for the standard RR fields
        size = 11
        # This would be more efficient if options had a size() method, but we won't
        # worry about that for now.  We also don't worry if there is an existing padding
        # option, as it is unlikely and probably harmless, as the worst case is that we
        # may add another, and this seems to be legal.
        for option in self.opt[0].options:
            wire = option.to_wire()
            # We add 4 here to account for the option type and length
            size += len(wire) + 4
        if self.pad:
            # Padding will be added, so again add the option type and length.
            size += 4
        return size

    def _compute_tsig_reserve(self) -&gt; int:
        &quot;&quot;&quot;Compute the size required for the TSIG RR&quot;&quot;&quot;
        # This would be more efficient if TSIGs had a size method, but we won't
        # worry about for now.  Also, we can't really cope with the potential
        # compressibility of the TSIG owner name, so we estimate with the uncompressed
        # size.  We will disable compression when TSIG and padding are both is active
        # so that the padding comes out right.
        if not self.tsig:
            return 0
        f = io.BytesIO()
        self.tsig.to_wire(f)
        return len(f.getvalue())

    def to_wire(
        self,
        origin: Optional[dns.name.Name] = None,
        max_size: int = 0,
        multi: bool = False,
        tsig_ctx: Optional[Any] = None,
        prepend_length: bool = False,
        prefer_truncation: bool = False,
        **kw: Dict[str, Any],
    ) -&gt; bytes:
        &quot;&quot;&quot;Return a string containing the message in DNS compressed wire
        format.

        Additional keyword arguments are passed to the RRset ``to_wire()``
        method.

        *origin*, a ``dns.name.Name`` or ``None``, the origin to be appended
        to any relative names.  If ``None``, and the message has an origin
        attribute that is not ``None``, then it will be used.

        *max_size*, an ``int``, the maximum size of the wire format
        output; default is 0, which means &quot;the message's request
        payload, if nonzero, or 65535&quot;.

        *multi*, a ``bool``, should be set to ``True`` if this message is
        part of a multiple message sequence.

        *tsig_ctx*, a ``dns.tsig.HMACTSig`` or ``dns.tsig.GSSTSig`` object, the
        ongoing TSIG context, used when signing zone transfers.

        *prepend_length*, a ``bool``, should be set to ``True`` if the caller
        wants the message length prepended to the message itself.  This is
        useful for messages sent over TCP, TLS (DoT), or QUIC (DoQ).

        *prefer_truncation*, a ``bool``, should be set to ``True`` if the caller
        wants the message to be truncated if it would otherwise exceed the
        maximum length.  If the truncation occurs before the additional section,
        the TC bit will be set.

        Raises ``dns.exception.TooBig`` if *max_size* was exceeded.

        Returns a ``bytes``.
        &quot;&quot;&quot;

        if origin is None and self.origin is not None:
            origin = self.origin
        if max_size == 0:
            if self.request_payload != 0:
                max_size = self.request_payload
            else:
                max_size = 65535
        if max_size &lt; 512:
            max_size = 512
        elif max_size &gt; 65535:
            max_size = 65535
        r = dns.renderer.Renderer(self.id, self.flags, max_size, origin)
        opt_reserve = self._compute_opt_reserve()
        r.reserve(opt_reserve)
        tsig_reserve = self._compute_tsig_reserve()
        r.reserve(tsig_reserve)
        try:
            for rrset in self.question:
                r.add_question(rrset.name, rrset.rdtype, rrset.rdclass)
            for rrset in self.answer:
                r.add_rrset(dns.renderer.ANSWER, rrset, **kw)
            for rrset in self.authority:
                r.add_rrset(dns.renderer.AUTHORITY, rrset, **kw)
            for rrset in self.additional:
                r.add_rrset(dns.renderer.ADDITIONAL, rrset, **kw)
        except dns.exception.TooBig:
            if prefer_truncation:
                if r.section &lt; dns.renderer.ADDITIONAL:
                    r.flags |= dns.flags.TC
            else:
                raise
        r.release_reserved()
        if self.opt is not None:
            r.add_opt(self.opt, self.pad, opt_reserve, tsig_reserve)
        r.write_header()
        if self.tsig is not None:
            (new_tsig, ctx) = dns.tsig.sign(
                r.get_wire(),
                self.keyring,
                self.tsig[0],
                int(time.time()),
                self.request_mac,
                tsig_ctx,
                multi,
            )
            self.tsig.clear()
            self.tsig.add(new_tsig)
            r.add_rrset(dns.renderer.ADDITIONAL, self.tsig)
            r.write_header()
            if multi:
                self.tsig_ctx = ctx
        wire = r.get_wire()
        self.wire = wire
        if prepend_length:
            wire = len(wire).to_bytes(2, &quot;big&quot;) + wire
        return wire

    @staticmethod
    def _make_tsig(
        keyname, algorithm, time_signed, fudge, mac, original_id, error, other
    ):
        tsig = dns.rdtypes.ANY.TSIG.TSIG(
            dns.rdataclass.ANY,
            dns.rdatatype.TSIG,
            algorithm,
            time_signed,
            fudge,
            mac,
            original_id,
            error,
            other,
        )
        return dns.rrset.from_rdata(keyname, 0, tsig)

    def use_tsig(
        self,
        keyring: Any,
        keyname: Optional[Union[dns.name.Name, str]] = None,
        fudge: int = 300,
        original_id: Optional[int] = None,
        tsig_error: int = 0,
        other_data: bytes = b&quot;&quot;,
        algorithm: Union[dns.name.Name, str] = dns.tsig.default_algorithm,
    ) -&gt; None:
        &quot;&quot;&quot;When sending, a TSIG signature using the specified key
        should be added.

        *key*, a ``dns.tsig.Key`` is the key to use.  If a key is specified,
        the *keyring* and *algorithm* fields are not used.

        *keyring*, a ``dict``, ``callable`` or ``dns.tsig.Key``, is either
        the TSIG keyring or key to use.

        The format of a keyring dict is a mapping from TSIG key name, as
        ``dns.name.Name`` to ``dns.tsig.Key`` or a TSIG secret, a ``bytes``.
        If a ``dict`` *keyring* is specified but a *keyname* is not, the key
        used will be the first key in the *keyring*.  Note that the order of
        keys in a dictionary is not defined, so applications should supply a
        keyname when a ``dict`` keyring is used, unless they know the keyring
        contains only one key.  If a ``callable`` keyring is specified, the
        callable will be called with the message and the keyname, and is
        expected to return a key.

        *keyname*, a ``dns.name.Name``, ``str`` or ``None``, the name of
        this TSIG key to use; defaults to ``None``.  If *keyring* is a
        ``dict``, the key must be defined in it.  If *keyring* is a
        ``dns.tsig.Key``, this is ignored.

        *fudge*, an ``int``, the TSIG time fudge.

        *original_id*, an ``int``, the TSIG original id.  If ``None``,
        the message's id is used.

        *tsig_error*, an ``int``, the TSIG error code.

        *other_data*, a ``bytes``, the TSIG other data.

        *algorithm*, a ``dns.name.Name`` or ``str``, the TSIG algorithm to use.  This is
        only used if *keyring* is a ``dict``, and the key entry is a ``bytes``.
        &quot;&quot;&quot;

        if isinstance(keyring, dns.tsig.Key):
            key = keyring
            keyname = key.name
        elif callable(keyring):
            key = keyring(self, keyname)
        else:
            if isinstance(keyname, str):
                keyname = dns.name.from_text(keyname)
            if keyname is None:
                keyname = next(iter(keyring))
            key = keyring[keyname]
            if isinstance(key, bytes):
                key = dns.tsig.Key(keyname, key, algorithm)
        self.keyring = key
        if original_id is None:
            original_id = self.id
        self.tsig = self._make_tsig(
            keyname,
            self.keyring.algorithm,
            0,
            fudge,
            b&quot;\x00&quot; * dns.tsig.mac_sizes[self.keyring.algorithm],
            original_id,
            tsig_error,
            other_data,
        )

    @property
    def keyname(self) -&gt; Optional[dns.name.Name]:
        if self.tsig:
            return self.tsig.name
        else:
            return None

    @property
    def keyalgorithm(self) -&gt; Optional[dns.name.Name]:
        if self.tsig:
            return self.tsig[0].algorithm
        else:
            return None

    @property
    def mac(self) -&gt; Optional[bytes]:
        if self.tsig:
            return self.tsig[0].mac
        else:
            return None

    @property
    def tsig_error(self) -&gt; Optional[int]:
        if self.tsig:
            return self.tsig[0].error
        else:
            return None

    @property
    def had_tsig(self) -&gt; bool:
        return bool(self.tsig)

    @staticmethod
    def _make_opt(flags=0, payload=DEFAULT_EDNS_PAYLOAD, options=None):
        opt = dns.rdtypes.ANY.OPT.OPT(payload, dns.rdatatype.OPT, options or ())
        return dns.rrset.from_rdata(dns.name.root, int(flags), opt)

    def use_edns(
        self,
        edns: Optional[Union[int, bool]] = 0,
        ednsflags: int = 0,
        payload: int = DEFAULT_EDNS_PAYLOAD,
        request_payload: Optional[int] = None,
        options: Optional[List[dns.edns.Option]] = None,
        pad: int = 0,
    ) -&gt; None:
        &quot;&quot;&quot;Configure EDNS behavior.

        *edns*, an ``int``, is the EDNS level to use.  Specifying ``None``, ``False``,
        or ``-1`` means &quot;do not use EDNS&quot;, and in this case the other parameters are
        ignored.  Specifying ``True`` is equivalent to specifying 0, i.e. &quot;use EDNS0&quot;.

        *ednsflags*, an ``int``, the EDNS flag values.

        *payload*, an ``int``, is the EDNS sender's payload field, which is the maximum
        size of UDP datagram the sender can handle.  I.e. how big a response to this
        message can be.

        *request_payload*, an ``int``, is the EDNS payload size to use when sending this
        message.  If not specified, defaults to the value of *payload*.

        *options*, a list of ``dns.edns.Option`` objects or ``None``, the EDNS options.

        *pad*, a non-negative ``int``.  If 0, the default, do not pad; otherwise add
        padding bytes to make the message size a multiple of *pad*.  Note that if
        padding is non-zero, an EDNS PADDING option will always be added to the
        message.
        &quot;&quot;&quot;

        if edns is None or edns is False:
            edns = -1
        elif edns is True:
            edns = 0
        if edns &lt; 0:
            self.opt = None
            self.request_payload = 0
        else:
            # make sure the EDNS version in ednsflags agrees with edns
            ednsflags &amp;= 0xFF00FFFF
            ednsflags |= edns &lt;&lt; 16
            if options is None:
                options = []
            self.opt = self._make_opt(ednsflags, payload, options)
            if request_payload is None:
                request_payload = payload
            self.request_payload = request_payload
            if pad &lt; 0:
                raise ValueError(&quot;pad must be non-negative&quot;)
            self.pad = pad

    @property
    def edns(self) -&gt; int:
        if self.opt:
            return (self.ednsflags &amp; 0xFF0000) &gt;&gt; 16
        else:
            return -1

    @property
    def ednsflags(self) -&gt; int:
        if self.opt:
            return self.opt.ttl
        else:
            return 0

    @ednsflags.setter
    def ednsflags(self, v):
        if self.opt:
            self.opt.ttl = v
        elif v:
            self.opt = self._make_opt(v)

    @property
    def payload(self) -&gt; int:
        if self.opt:
            return self.opt[0].payload
        else:
            return 0

    @property
    def options(self) -&gt; Tuple:
        if self.opt:
            return self.opt[0].options
        else:
            return ()

    def want_dnssec(self, wanted: bool = True) -&gt; None:
        &quot;&quot;&quot;Enable or disable 'DNSSEC desired' flag in requests.

        *wanted*, a ``bool``.  If ``True``, then DNSSEC data is
        desired in the response, EDNS is enabled if required, and then
        the DO bit is set.  If ``False``, the DO bit is cleared if
        EDNS is enabled.
        &quot;&quot;&quot;

        if wanted:
            self.ednsflags |= dns.flags.DO
        elif self.opt:
            self.ednsflags &amp;= ~int(dns.flags.DO)

    def rcode(self) -&gt; dns.rcode.Rcode:
        &quot;&quot;&quot;Return the rcode.

        Returns a ``dns.rcode.Rcode``.
        &quot;&quot;&quot;
        return dns.rcode.from_flags(int(self.flags), int(self.ednsflags))

    def set_rcode(self, rcode: dns.rcode.Rcode) -&gt; None:
        &quot;&quot;&quot;Set the rcode.

        *rcode*, a ``dns.rcode.Rcode``, is the rcode to set.
        &quot;&quot;&quot;
        (value, evalue) = dns.rcode.to_flags(rcode)
        self.flags &amp;= 0xFFF0
        self.flags |= value
        self.ednsflags &amp;= 0x00FFFFFF
        self.ednsflags |= evalue

    def opcode(self) -&gt; dns.opcode.Opcode:
        &quot;&quot;&quot;Return the opcode.

        Returns a ``dns.opcode.Opcode``.
        &quot;&quot;&quot;
        return dns.opcode.from_flags(int(self.flags))

    def set_opcode(self, opcode: dns.opcode.Opcode) -&gt; None:
        &quot;&quot;&quot;Set the opcode.

        *opcode*, a ``dns.opcode.Opcode``, is the opcode to set.
        &quot;&quot;&quot;
        self.flags &amp;= 0x87FF
        self.flags |= dns.opcode.to_flags(opcode)

    def get_options(self, otype: dns.edns.OptionType) -&gt; List[dns.edns.Option]:
        &quot;&quot;&quot;Return the list of options of the specified type.&quot;&quot;&quot;
        return [option for option in self.options if option.otype == otype]

    def extended_errors(self) -&gt; List[dns.edns.EDEOption]:
        &quot;&quot;&quot;Return the list of Extended DNS Error (EDE) options in the message&quot;&quot;&quot;
        return cast(List[dns.edns.EDEOption], self.get_options(dns.edns.OptionType.EDE))

    def _get_one_rr_per_rrset(self, value):
        # What the caller picked is fine.
        return value

    # pylint: disable=unused-argument

    def _parse_rr_header(self, section, name, rdclass, rdtype):
        return (rdclass, rdtype, None, False)

    # pylint: enable=unused-argument

    def _parse_special_rr_header(self, section, count, position, name, rdclass, rdtype):
        if rdtype == dns.rdatatype.OPT:
            if (
                section != MessageSection.ADDITIONAL
                or self.opt
                or name != dns.name.root
            ):
                raise BadEDNS
        elif rdtype == dns.rdatatype.TSIG:
            if (
                section != MessageSection.ADDITIONAL
                or rdclass != dns.rdatatype.ANY
                or position != count - 1
            ):
                raise BadTSIG
        return (rdclass, rdtype, None, False)


class ChainingResult:
    &quot;&quot;&quot;The result of a call to dns.message.QueryMessage.resolve_chaining().

    The ``answer`` attribute is the answer RRSet, or ``None`` if it doesn't
    exist.

    The ``canonical_name`` attribute is the canonical name after all
    chaining has been applied (this is the same name as ``rrset.name`` in cases
    where rrset is not ``None``).

    The ``minimum_ttl`` attribute is the minimum TTL, i.e. the TTL to
    use if caching the data.  It is the smallest of all the CNAME TTLs
    and either the answer TTL if it exists or the SOA TTL and SOA
    minimum values for negative answers.

    The ``cnames`` attribute is a list of all the CNAME RRSets followed to
    get to the canonical name.
    &quot;&quot;&quot;

    def __init__(
        self,
        canonical_name: dns.name.Name,
        answer: Optional[dns.rrset.RRset],
        minimum_ttl: int,
        cnames: List[dns.rrset.RRset],
    ):
        self.canonical_name = canonical_name
        self.answer = answer
        self.minimum_ttl = minimum_ttl
        self.cnames = cnames


class QueryMessage(Message):
    def resolve_chaining(self) -&gt; ChainingResult:
        &quot;&quot;&quot;Follow the CNAME chain in the response to determine the answer
        RRset.

        Raises ``dns.message.NotQueryResponse`` if the message is not
        a response.

        Raises ``dns.message.ChainTooLong`` if the CNAME chain is too long.

        Raises ``dns.message.AnswerForNXDOMAIN`` if the rcode is NXDOMAIN
        but an answer was found.

        Raises ``dns.exception.FormError`` if the question count is not 1.

        Returns a ChainingResult object.
        &quot;&quot;&quot;
        if self.flags &amp; dns.flags.QR == 0:
            raise NotQueryResponse
        if len(self.question) != 1:
            raise dns.exception.FormError
        question = self.question[0]
        qname = question.name
        min_ttl = dns.ttl.MAX_TTL
        answer = None
        count = 0
        cnames = []
        while count &lt; MAX_CHAIN:
            try:
                answer = self.find_rrset(
                    self.answer, qname, question.rdclass, question.rdtype
                )
                min_ttl = min(min_ttl, answer.ttl)
                break
            except KeyError:
                if question.rdtype != dns.rdatatype.CNAME:
                    try:
                        crrset = self.find_rrset(
                            self.answer, qname, question.rdclass, dns.rdatatype.CNAME
                        )
                        cnames.append(crrset)
                        min_ttl = min(min_ttl, crrset.ttl)
                        for rd in crrset:
                            qname = rd.target
                            break
                        count += 1
                        continue
                    except KeyError:
                        # Exit the chaining loop
                        break
                else:
                    # Exit the chaining loop
                    break
        if count &gt;= MAX_CHAIN:
            raise ChainTooLong
        if self.rcode() == dns.rcode.NXDOMAIN and answer is not None:
            raise AnswerForNXDOMAIN
        if answer is None:
            # Further minimize the TTL with NCACHE.
            auname = qname
            while True:
                # Look for an SOA RR whose owner name is a superdomain
                # of qname.
                try:
                    srrset = self.find_rrset(
                        self.authority, auname, question.rdclass, dns.rdatatype.SOA
                    )
                    min_ttl = min(min_ttl, srrset.ttl, srrset[0].minimum)
                    break
                except KeyError:
                    try:
                        auname = auname.parent()
                    except dns.name.NoParent:
                        break
        return ChainingResult(qname, answer, min_ttl, cnames)

    def canonical_name(self) -&gt; dns.name.Name:
        &quot;&quot;&quot;Return the canonical name of the first name in the question
        section.

        Raises ``dns.message.NotQueryResponse`` if the message is not
        a response.

        Raises ``dns.message.ChainTooLong`` if the CNAME chain is too long.

        Raises ``dns.message.AnswerForNXDOMAIN`` if the rcode is NXDOMAIN
        but an answer was found.

        Raises ``dns.exception.FormError`` if the question count is not 1.
        &quot;&quot;&quot;
        return self.resolve_chaining().canonical_name


def _maybe_import_update():
    # We avoid circular imports by doing this here.  We do it in another
    # function as doing it in _message_factory_from_opcode() makes &quot;dns&quot;
    # a local symbol, and the first line fails :)

    # pylint: disable=redefined-outer-name,import-outside-toplevel,unused-import
    import dns.update  # noqa: F401


def _message_factory_from_opcode(opcode):
    if opcode == dns.opcode.QUERY:
        return QueryMessage
    elif opcode == dns.opcode.UPDATE:
        _maybe_import_update()
        return dns.update.UpdateMessage
    else:
        return Message


class _WireReader:
    &quot;&quot;&quot;Wire format reader.

    parser: the binary parser
    message: The message object being built
    initialize_message: Callback to set message parsing options
    question_only: Are we only reading the question?
    one_rr_per_rrset: Put each RR into its own RRset?
    keyring: TSIG keyring
    ignore_trailing: Ignore trailing junk at end of request?
    multi: Is this message part of a multi-message sequence?
    DNS dynamic updates.
    continue_on_error: try to extract as much information as possible from
    the message, accumulating MessageErrors in the *errors* attribute instead of
    raising them.
    &quot;&quot;&quot;

    def __init__(
        self,
        wire,
        initialize_message,
        question_only=False,
        one_rr_per_rrset=False,
        ignore_trailing=False,
        keyring=None,
        multi=False,
        continue_on_error=False,
    ):
        self.parser = dns.wire.Parser(wire)
        self.message = None
        self.initialize_message = initialize_message
        self.question_only = question_only
        self.one_rr_per_rrset = one_rr_per_rrset
        self.ignore_trailing = ignore_trailing
        self.keyring = keyring
        self.multi = multi
        self.continue_on_error = continue_on_error
        self.errors = []

    def _get_question(self, section_number, qcount):
        &quot;&quot;&quot;Read the next *qcount* records from the wire data and add them to
        the question section.
        &quot;&quot;&quot;
        assert self.message is not None
        section = self.message.sections[section_number]
        for _ in range(qcount):
            qname = self.parser.get_name(self.message.origin)
            (rdtype, rdclass) = self.parser.get_struct(&quot;!HH&quot;)
            (rdclass, rdtype, _, _) = self.message._parse_rr_header(
                section_number, qname, rdclass, rdtype
            )
            self.message.find_rrset(
                section, qname, rdclass, rdtype, create=True, force_unique=True
            )

    def _add_error(self, e):
        self.errors.append(MessageError(e, self.parser.current))

    def _get_section(self, section_number, count):
        &quot;&quot;&quot;Read the next I{count} records from the wire data and add them to
        the specified section.

        section_number: the section of the message to which to add records
        count: the number of records to read
        &quot;&quot;&quot;
        assert self.message is not None
        section = self.message.sections[section_number]
        force_unique = self.one_rr_per_rrset
        for i in range(count):
            rr_start = self.parser.current
            absolute_name = self.parser.get_name()
            if self.message.origin is not None:
                name = absolute_name.relativize(self.message.origin)
            else:
                name = absolute_name
            (rdtype, rdclass, ttl, rdlen) = self.parser.get_struct(&quot;!HHIH&quot;)
            if rdtype in (dns.rdatatype.OPT, dns.rdatatype.TSIG):
                (
                    rdclass,
                    rdtype,
                    deleting,
                    empty,
                ) = self.message._parse_special_rr_header(
                    section_number, count, i, name, rdclass, rdtype
                )
            else:
                (rdclass, rdtype, deleting, empty) = self.message._parse_rr_header(
                    section_number, name, rdclass, rdtype
                )
            rdata_start = self.parser.current
            try:
                if empty:
                    if rdlen &gt; 0:
                        raise dns.exception.FormError
                    rd = None
                    covers = dns.rdatatype.NONE
                else:
                    with self.parser.restrict_to(rdlen):
                        rd = dns.rdata.from_wire_parser(
                            rdclass, rdtype, self.parser, self.message.origin
                        )
                    covers = rd.covers()
                if self.message.xfr and rdtype == dns.rdatatype.SOA:
                    force_unique = True
                if rdtype == dns.rdatatype.OPT:
                    self.message.opt = dns.rrset.from_rdata(name, ttl, rd)
                elif rdtype == dns.rdatatype.TSIG:
                    if self.keyring is None or self.keyring is True:
                        raise UnknownTSIGKey(&quot;got signed message without keyring&quot;)
                    elif isinstance(self.keyring, dict):
                        key = self.keyring.get(absolute_name)
                        if isinstance(key, bytes):
                            key = dns.tsig.Key(absolute_name, key, rd.algorithm)
                    elif callable(self.keyring):
                        key = self.keyring(self.message, absolute_name)
                    else:
                        key = self.keyring
                    if key is None:
                        raise UnknownTSIGKey(f&quot;key '{name}' unknown&quot;)
                    if key:
                        self.message.keyring = key
                        self.message.tsig_ctx = dns.tsig.validate(
                            self.parser.wire,
                            key,
                            absolute_name,
                            rd,
                            int(time.time()),
                            self.message.request_mac,
                            rr_start,
                            self.message.tsig_ctx,
                            self.multi,
                        )
                    self.message.tsig = dns.rrset.from_rdata(absolute_name, 0, rd)
                else:
                    rrset = self.message.find_rrset(
                        section,
                        name,
                        rdclass,
                        rdtype,
                        covers,
                        deleting,
                        True,
                        force_unique,
                    )
                    if rd is not None:
                        if ttl &gt; 0x7FFFFFFF:
                            ttl = 0
                        rrset.add(rd, ttl)
            except Exception as e:
                if self.continue_on_error:
                    self._add_error(e)
                    self.parser.seek(rdata_start + rdlen)
                else:
                    raise

    def read(self):
        &quot;&quot;&quot;Read a wire format DNS message and build a dns.message.Message
        object.&quot;&quot;&quot;

        if self.parser.remaining() &lt; 12:
            raise ShortHeader
        (id, flags, qcount, ancount, aucount, adcount) = self.parser.get_struct(
            &quot;!HHHHHH&quot;
        )
        factory = _message_factory_from_opcode(dns.opcode.from_flags(flags))
        self.message = factory(id=id)
        self.message.flags = dns.flags.Flag(flags)
        self.message.wire = self.parser.wire
        self.initialize_message(self.message)
        self.one_rr_per_rrset = self.message._get_one_rr_per_rrset(
            self.one_rr_per_rrset
        )
        try:
            self._get_question(MessageSection.QUESTION, qcount)
            if self.question_only:
                return self.message
            self._get_section(MessageSection.ANSWER, ancount)
            self._get_section(MessageSection.AUTHORITY, aucount)
            self._get_section(MessageSection.ADDITIONAL, adcount)
            if not self.ignore_trailing and self.parser.remaining() != 0:
                raise TrailingJunk
            if self.multi and self.message.tsig_ctx and not self.message.had_tsig:
                self.message.tsig_ctx.update(self.parser.wire)
        except Exception as e:
            if self.continue_on_error:
                self._add_error(e)
            else:
                raise
        return self.message


def from_wire(
    wire: bytes,
    keyring: Optional[Any] = None,
    request_mac: Optional[bytes] = b&quot;&quot;,
    xfr: bool = False,
    origin: Optional[dns.name.Name] = None,
    tsig_ctx: Optional[Union[dns.tsig.HMACTSig, dns.tsig.GSSTSig]] = None,
    multi: bool = False,
    question_only: bool = False,
    one_rr_per_rrset: bool = False,
    ignore_trailing: bool = False,
    raise_on_truncation: bool = False,
    continue_on_error: bool = False,
) -&gt; Message:
    &quot;&quot;&quot;Convert a DNS wire format message into a message object.

    *keyring*, a ``dns.tsig.Key``, ``dict``, ``bool``, or ``None``, the key or keyring
    to use if the message is signed.  If ``None`` or ``True``, then trying to decode
    a message with a TSIG will fail as it cannot be validated.  If ``False``, then
    TSIG validation is disabled.

    *request_mac*, a ``bytes`` or ``None``.  If the message is a response to a
    TSIG-signed request, *request_mac* should be set to the MAC of that request.

    *xfr*, a ``bool``, should be set to ``True`` if this message is part of a zone
    transfer.

    *origin*, a ``dns.name.Name`` or ``None``.  If the message is part of a zone
    transfer, *origin* should be the origin name of the zone.  If not ``None``, names
    will be relativized to the origin.

    *tsig_ctx*, a ``dns.tsig.HMACTSig`` or ``dns.tsig.GSSTSig`` object, the ongoing TSIG
    context, used when validating zone transfers.

    *multi*, a ``bool``, should be set to ``True`` if this message is part of a multiple
    message sequence.

    *question_only*, a ``bool``.  If ``True``, read only up to the end of the question
    section.

    *one_rr_per_rrset*, a ``bool``.  If ``True``, put each RR into its own RRset.

    *ignore_trailing*, a ``bool``.  If ``True``, ignore trailing junk at end of the
    message.

    *raise_on_truncation*, a ``bool``.  If ``True``, raise an exception if the TC bit is
    set.

    *continue_on_error*, a ``bool``.  If ``True``, try to continue parsing even if
    errors occur.  Erroneous rdata will be ignored.  Errors will be accumulated as a
    list of MessageError objects in the message's ``errors`` attribute.  This option is
    recommended only for DNS analysis tools, or for use in a server as part of an error
    handling path.  The default is ``False``.

    Raises ``dns.message.ShortHeader`` if the message is less than 12 octets long.

    Raises ``dns.message.TrailingJunk`` if there were octets in the message past the end
    of the proper DNS message, and *ignore_trailing* is ``False``.

    Raises ``dns.message.BadEDNS`` if an OPT record was in the wrong section, or
    occurred more than once.

    Raises ``dns.message.BadTSIG`` if a TSIG record was not the last record of the
    additional data section.

    Raises ``dns.message.Truncated`` if the TC flag is set and *raise_on_truncation* is
    ``True``.

    Returns a ``dns.message.Message``.
    &quot;&quot;&quot;

    # We permit None for request_mac solely for backwards compatibility
    if request_mac is None:
        request_mac = b&quot;&quot;

    def initialize_message(message):
        message.request_mac = request_mac
        message.xfr = xfr
        message.origin = origin
        message.tsig_ctx = tsig_ctx

    reader = _WireReader(
        wire,
        initialize_message,
        question_only,
        one_rr_per_rrset,
        ignore_trailing,
        keyring,
        multi,
        continue_on_error,
    )
    try:
        m = reader.read()
    except dns.exception.FormError:
        if (
            reader.message
            and (reader.message.flags &amp; dns.flags.TC)
            and raise_on_truncation
        ):
            raise Truncated(message=reader.message)
        else:
            raise
    # Reading a truncated message might not have any errors, so we
    # have to do this check here too.
    if m.flags &amp; dns.flags.TC and raise_on_truncation:
        raise Truncated(message=m)
    if continue_on_error:
        m.errors = reader.errors

    return m


class _TextReader:
    &quot;&quot;&quot;Text format reader.

    tok: the tokenizer.
    message: The message object being built.
    DNS dynamic updates.
    last_name: The most recently read name when building a message object.
    one_rr_per_rrset: Put each RR into its own RRset?
    origin: The origin for relative names
    relativize: relativize names?
    relativize_to: the origin to relativize to.
    &quot;&quot;&quot;

    def __init__(
        self,
        text,
        idna_codec,
        one_rr_per_rrset=False,
        origin=None,
        relativize=True,
        relativize_to=None,
    ):
        self.message = None
        self.tok = dns.tokenizer.Tokenizer(text, idna_codec=idna_codec)
        self.last_name = None
        self.one_rr_per_rrset = one_rr_per_rrset
        self.origin = origin
        self.relativize = relativize
        self.relativize_to = relativize_to
        self.id = None
        self.edns = -1
        self.ednsflags = 0
        self.payload = DEFAULT_EDNS_PAYLOAD
        self.rcode = None
        self.opcode = dns.opcode.QUERY
        self.flags = 0

    def _header_line(self, _):
        &quot;&quot;&quot;Process one line from the text format header section.&quot;&quot;&quot;

        token = self.tok.get()
        what = token.value
        if what == &quot;id&quot;:
            self.id = self.tok.get_int()
        elif what == &quot;flags&quot;:
            while True:
                token = self.tok.get()
                if not token.is_identifier():
                    self.tok.unget(token)
                    break
                self.flags = self.flags | dns.flags.from_text(token.value)
        elif what == &quot;edns&quot;:
            self.edns = self.tok.get_int()
            self.ednsflags = self.ednsflags | (self.edns &lt;&lt; 16)
        elif what == &quot;eflags&quot;:
            if self.edns &lt; 0:
                self.edns = 0
            while True:
                token = self.tok.get()
                if not token.is_identifier():
                    self.tok.unget(token)
                    break
                self.ednsflags = self.ednsflags | dns.flags.edns_from_text(token.value)
        elif what == &quot;payload&quot;:
            self.payload = self.tok.get_int()
            if self.edns &lt; 0:
                self.edns = 0
        elif what == &quot;opcode&quot;:
            text = self.tok.get_string()
            self.opcode = dns.opcode.from_text(text)
            self.flags = self.flags | dns.opcode.to_flags(self.opcode)
        elif what == &quot;rcode&quot;:
            text = self.tok.get_string()
            self.rcode = dns.rcode.from_text(text)
        else:
            raise UnknownHeaderField
        self.tok.get_eol()

    def _question_line(self, section_number):
        &quot;&quot;&quot;Process one line from the text format question section.&quot;&quot;&quot;

        section = self.message.sections[section_number]
        token = self.tok.get(want_leading=True)
        if not token.is_whitespace():
            self.last_name = self.tok.as_name(
                token, self.message.origin, self.relativize, self.relativize_to
            )
        name = self.last_name
        if name is None:
            raise NoPreviousName
        token = self.tok.get()
        if not token.is_identifier():
            raise dns.exception.SyntaxError
        # Class
        try:
            rdclass = dns.rdataclass.from_text(token.value)
            token = self.tok.get()
            if not token.is_identifier():
                raise dns.exception.SyntaxError
        except dns.exception.SyntaxError:
            raise dns.exception.SyntaxError
        except Exception:
            rdclass = dns.rdataclass.IN
        # Type
        rdtype = dns.rdatatype.from_text(token.value)
        (rdclass, rdtype, _, _) = self.message._parse_rr_header(
            section_number, name, rdclass, rdtype
        )
        self.message.find_rrset(
            section, name, rdclass, rdtype, create=True, force_unique=True
        )
        self.tok.get_eol()

    def _rr_line(self, section_number):
        &quot;&quot;&quot;Process one line from the text format answer, authority, or
        additional data sections.
        &quot;&quot;&quot;

        section = self.message.sections[section_number]
        # Name
        token = self.tok.get(want_leading=True)
        if not token.is_whitespace():
            self.last_name = self.tok.as_name(
                token, self.message.origin, self.relativize, self.relativize_to
            )
        name = self.last_name
        if name is None:
            raise NoPreviousName
        token = self.tok.get()
        if not token.is_identifier():
            raise dns.exception.SyntaxError
        # TTL
        try:
            ttl = int(token.value, 0)
            token = self.tok.get()
            if not token.is_identifier():
                raise dns.exception.SyntaxError
        except dns.exception.SyntaxError:
            raise dns.exception.SyntaxError
        except Exception:
            ttl = 0
        # Class
        try:
            rdclass = dns.rdataclass.from_text(token.value)
            token = self.tok.get()
            if not token.is_identifier():
                raise dns.exception.SyntaxError
        except dns.exception.SyntaxError:
            raise dns.exception.SyntaxError
        except Exception:
            rdclass = dns.rdataclass.IN
        # Type
        rdtype = dns.rdatatype.from_text(token.value)
        (rdclass, rdtype, deleting, empty) = self.message._parse_rr_header(
            section_number, name, rdclass, rdtype
        )
        token = self.tok.get()
        if empty and not token.is_eol_or_eof():
            raise dns.exception.SyntaxError
        if not empty and token.is_eol_or_eof():
            raise dns.exception.UnexpectedEnd
        if not token.is_eol_or_eof():
            self.tok.unget(token)
            rd = dns.rdata.from_text(
                rdclass,
                rdtype,
                self.tok,
                self.message.origin,
                self.relativize,
                self.relativize_to,
            )
            covers = rd.covers()
        else:
            rd = None
            covers = dns.rdatatype.NONE
        rrset = self.message.find_rrset(
            section,
            name,
            rdclass,
            rdtype,
            covers,
            deleting,
            True,
            self.one_rr_per_rrset,
        )
        if rd is not None:
            rrset.add(rd, ttl)

    def _make_message(self):
        factory = _message_factory_from_opcode(self.opcode)
        message = factory(id=self.id)
        message.flags = self.flags
        if self.edns &gt;= 0:
            message.use_edns(self.edns, self.ednsflags, self.payload)
        if self.rcode:
            message.set_rcode(self.rcode)
        if self.origin:
            message.origin = self.origin
        return message

    def read(self):
        &quot;&quot;&quot;Read a text format DNS message and build a dns.message.Message
        object.&quot;&quot;&quot;

        line_method = self._header_line
        section_number = None
        while 1:
            token = self.tok.get(True, True)
            if token.is_eol_or_eof():
                break
            if token.is_comment():
                u = token.value.upper()
                if u == &quot;HEADER&quot;:
                    line_method = self._header_line

                if self.message:
                    message = self.message
                else:
                    # If we don't have a message, create one with the current
                    # opcode, so that we know which section names to parse.
                    message = self._make_message()
                try:
                    section_number = message._section_enum.from_text(u)
                    # We found a section name.  If we don't have a message,
                    # use the one we just created.
                    if not self.message:
                        self.message = message
                        self.one_rr_per_rrset = message._get_one_rr_per_rrset(
                            self.one_rr_per_rrset
                        )
                    if section_number == MessageSection.QUESTION:
                        line_method = self._question_line
                    else:
                        line_method = self._rr_line
                except Exception:
                    # It's just a comment.
                    pass
                self.tok.get_eol()
                continue
            self.tok.unget(token)
            line_method(section_number)
        if not self.message:
            self.message = self._make_message()
        return self.message


def from_text(
    text: str,
    idna_codec: Optional[dns.name.IDNACodec] = None,
    one_rr_per_rrset: bool = False,
    origin: Optional[dns.name.Name] = None,
    relativize: bool = True,
    relativize_to: Optional[dns.name.Name] = None,
) -&gt; Message:
    &quot;&quot;&quot;Convert the text format message into a message object.

    The reader stops after reading the first blank line in the input to
    facilitate reading multiple messages from a single file with
    ``dns.message.from_file()``.

    *text*, a ``str``, the text format message.

    *idna_codec*, a ``dns.name.IDNACodec``, specifies the IDNA
    encoder/decoder.  If ``None``, the default IDNA 2003 encoder/decoder
    is used.

    *one_rr_per_rrset*, a ``bool``.  If ``True``, then each RR is put
    into its own rrset.  The default is ``False``.

    *origin*, a ``dns.name.Name`` (or ``None``), the
    origin to use for relative names.

    *relativize*, a ``bool``.  If true, name will be relativized.

    *relativize_to*, a ``dns.name.Name`` (or ``None``), the origin to use
    when relativizing names.  If not set, the *origin* value will be used.

    Raises ``dns.message.UnknownHeaderField`` if a header is unknown.

    Raises ``dns.exception.SyntaxError`` if the text is badly formed.

    Returns a ``dns.message.Message object``
    &quot;&quot;&quot;

    # 'text' can also be a file, but we don't publish that fact
    # since it's an implementation detail.  The official file
    # interface is from_file().

    reader = _TextReader(
        text, idna_codec, one_rr_per_rrset, origin, relativize, relativize_to
    )
    return reader.read()


def from_file(
    f: Any,
    idna_codec: Optional[dns.name.IDNACodec] = None,
    one_rr_per_rrset: bool = False,
) -&gt; Message:
    &quot;&quot;&quot;Read the next text format message from the specified file.

    Message blocks are separated by a single blank line.

    *f*, a ``file`` or ``str``.  If *f* is text, it is treated as the
    pathname of a file to open.

    *idna_codec*, a ``dns.name.IDNACodec``, specifies the IDNA
    encoder/decoder.  If ``None``, the default IDNA 2003 encoder/decoder
    is used.

    *one_rr_per_rrset*, a ``bool``.  If ``True``, then each RR is put
    into its own rrset.  The default is ``False``.

    Raises ``dns.message.UnknownHeaderField`` if a header is unknown.

    Raises ``dns.exception.SyntaxError`` if the text is badly formed.

    Returns a ``dns.message.Message object``
    &quot;&quot;&quot;

    if isinstance(f, str):
        cm: contextlib.AbstractContextManager = open(f)
    else:
        cm = contextlib.nullcontext(f)
    with cm as f:
        return from_text(f, idna_codec, one_rr_per_rrset)
    assert False  # for mypy  lgtm[py/unreachable-statement]


def make_query(
    qname: Union[dns.name.Name, str],
    rdtype: Union[dns.rdatatype.RdataType, str],
    rdclass: Union[dns.rdataclass.RdataClass, str] = dns.rdataclass.IN,
    use_edns: Optional[Union[int, bool]] = None,
    want_dnssec: bool = False,
    ednsflags: Optional[int] = None,
    payload: Optional[int] = None,
    request_payload: Optional[int] = None,
    options: Optional[List[dns.edns.Option]] = None,
    idna_codec: Optional[dns.name.IDNACodec] = None,
    id: Optional[int] = None,
    flags: int = dns.flags.RD,
    pad: int = 0,
) -&gt; QueryMessage:
    &quot;&quot;&quot;Make a query message.

    The query name, type, and class may all be specified either
    as objects of the appropriate type, or as strings.

    The query will have a randomly chosen query id, and its DNS flags
    will be set to dns.flags.RD.

    qname, a ``dns.name.Name`` or ``str``, the query name.

    *rdtype*, an ``int`` or ``str``, the desired rdata type.

    *rdclass*, an ``int`` or ``str``,  the desired rdata class; the default
    is class IN.

    *use_edns*, an ``int``, ``bool`` or ``None``.  The EDNS level to use; the
    default is ``None``.  If ``None``, EDNS will be enabled only if other
    parameters (*ednsflags*, *payload*, *request_payload*, or *options*) are
    set.
    See the description of dns.message.Message.use_edns() for the possible
    values for use_edns and their meanings.

    *want_dnssec*, a ``bool``.  If ``True``, DNSSEC data is desired.

    *ednsflags*, an ``int``, the EDNS flag values.

    *payload*, an ``int``, is the EDNS sender's payload field, which is the
    maximum size of UDP datagram the sender can handle.  I.e. how big
    a response to this message can be.

    *request_payload*, an ``int``, is the EDNS payload size to use when
    sending this message.  If not specified, defaults to the value of
    *payload*.

    *options*, a list of ``dns.edns.Option`` objects or ``None``, the EDNS
    options.

    *idna_codec*, a ``dns.name.IDNACodec``, specifies the IDNA
    encoder/decoder.  If ``None``, the default IDNA 2003 encoder/decoder
    is used.

    *id*, an ``int`` or ``None``, the desired query id.  The default is
    ``None``, which generates a random query id.

    *flags*, an ``int``, the desired query flags.  The default is
    ``dns.flags.RD``.

    *pad*, a non-negative ``int``.  If 0, the default, do not pad; otherwise add
    padding bytes to make the message size a multiple of *pad*.  Note that if
    padding is non-zero, an EDNS PADDING option will always be added to the
    message.

    Returns a ``dns.message.QueryMessage``
    &quot;&quot;&quot;

    if isinstance(qname, str):
        qname = dns.name.from_text(qname, idna_codec=idna_codec)
    rdtype = dns.rdatatype.RdataType.make(rdtype)
    rdclass = dns.rdataclass.RdataClass.make(rdclass)
    m = QueryMessage(id=id)
    m.flags = dns.flags.Flag(flags)
    m.find_rrset(m.question, qname, rdclass, rdtype, create=True, force_unique=True)
    # only pass keywords on to use_edns if they have been set to a
    # non-None value.  Setting a field will turn EDNS on if it hasn't
    # been configured.
    kwargs: Dict[str, Any] = {}
    if ednsflags is not None:
        kwargs[&quot;ednsflags&quot;] = ednsflags
    if payload is not None:
        kwargs[&quot;payload&quot;] = payload
    if request_payload is not None:
        kwargs[&quot;request_payload&quot;] = request_payload
    if options is not None:
        kwargs[&quot;options&quot;] = options
    if kwargs and use_edns is None:
        use_edns = 0
    kwargs[&quot;edns&quot;] = use_edns
    kwargs[&quot;pad&quot;] = pad
    m.use_edns(**kwargs)
    m.want_dnssec(want_dnssec)
    return m


class CopyMode(enum.Enum):
    &quot;&quot;&quot;
    How should sections be copied when making an update response?
    &quot;&quot;&quot;

    NOTHING = 0
    QUESTION = 1
    EVERYTHING = 2


def make_response(
    query: Message,
    recursion_available: bool = False,
    our_payload: int = 8192,
    fudge: int = 300,
    tsig_error: int = 0,
    pad: Optional[int] = None,
    copy_mode: Optional[CopyMode] = None,
) -&gt; Message:
    &quot;&quot;&quot;Make a message which is a response for the specified query.
    The message returned is really a response skeleton; it has all of the infrastructure
    required of a response, but none of the content.

    Response section(s) which are copied are shallow copies of the matching section(s)
    in the query, so the query's RRsets should not be changed.

    *query*, a ``dns.message.Message``, the query to respond to.

    *recursion_available*, a ``bool``, should RA be set in the response?

    *our_payload*, an ``int``, the payload size to advertise in EDNS responses.

    *fudge*, an ``int``, the TSIG time fudge.

    *tsig_error*, an ``int``, the TSIG error.

    *pad*, a non-negative ``int`` or ``None``.  If 0, the default, do not pad; otherwise
    if not ``None`` add padding bytes to make the message size a multiple of *pad*. Note
    that if padding is non-zero, an EDNS PADDING option will always be added to the
    message.  If ``None``, add padding following RFC 8467, namely if the request is
    padded, pad the response to 468 otherwise do not pad.

    *copy_mode*, a ``dns.message.CopyMode`` or ``None``, determines how sections are
    copied.  The default, ``None`` copies sections according to the default for the
    message's opcode, which is currently ``dns.message.CopyMode.QUESTION`` for all
    opcodes.   ``dns.message.CopyMode.QUESTION`` copies only the question section.
    ``dns.message.CopyMode.EVERYTHING`` copies all sections other than OPT or TSIG
    records, which are created appropriately if needed. ``dns.message.CopyMode.NOTHING``
    copies no sections; note that this mode is for server testing purposes and is
    otherwise not recommended for use.  In particular, ``dns.message.is_response()``
    will be ``False`` if you create a response this way and the rcode is not
    ``FORMERR``, ``SERVFAIL``, ``NOTIMP``, or ``REFUSED``.

    Returns a ``dns.message.Message`` object whose specific class is appropriate for the
    query.  For example, if query is a ``dns.update.UpdateMessage``, the response will
    be one too.
    &quot;&quot;&quot;

    if query.flags &amp; dns.flags.QR:
        raise dns.exception.FormError(&quot;specified query message is not a query&quot;)
    opcode = query.opcode()
    factory = _message_factory_from_opcode(opcode)
    response = factory(id=query.id)
    response.flags = dns.flags.QR | (query.flags &amp; dns.flags.RD)
    if recursion_available:
        response.flags |= dns.flags.RA
    response.set_opcode(opcode)
    if copy_mode is None:
        copy_mode = CopyMode.QUESTION
    if copy_mode != CopyMode.NOTHING:
        response.question = list(query.question)
    if copy_mode == CopyMode.EVERYTHING:
        response.answer = list(query.answer)
        response.authority = list(query.authority)
        response.additional = list(query.additional)
    if query.edns &gt;= 0:
        if pad is None:
            # Set response padding per RFC 8467
            pad = 0
            for option in query.options:
                if option.otype == dns.edns.OptionType.PADDING:
                    pad = 468
        response.use_edns(0, 0, our_payload, query.payload, pad=pad)
    if query.had_tsig:
        response.use_tsig(
            query.keyring,
            query.keyname,
            fudge,
            None,
            tsig_error,
            b&quot;&quot;,
            query.keyalgorithm,
        )
        response.request_mac = query.mac
    return response


### BEGIN generated MessageSection constants

QUESTION = MessageSection.QUESTION
ANSWER = MessageSection.ANSWER
AUTHORITY = MessageSection.AUTHORITY
ADDITIONAL = MessageSection.ADDITIONAL

### END generated MessageSection constants
                                                                                                                                                                                                                                                                                                                                                                                                                                       opt/alt/python311/lib64/python3.11/email/message.py                                                 0000644                 00000135635 15052001415 0015533 0                                                                                                    ustar 00                                                                                                                                                                                                                                                       # Copyright (C) 2001-2007 Python Software Foundation
# Author: Barry Warsaw
# Contact: email-sig@python.org

&quot;&quot;&quot;Basic message object for the email package object model.&quot;&quot;&quot;

__all__ = ['Message', 'EmailMessage']

import binascii
import re
import quopri
from io import BytesIO, StringIO

# Intrapackage imports
from email import utils
from email import errors
from email._policybase import Policy, compat32
from email import charset as _charset
from email._encoded_words import decode_b
Charset = _charset.Charset

SEMISPACE = '; '

# Regular expression that matches `special' characters in parameters, the
# existence of which force quoting of the parameter value.
tspecials = re.compile(r'[ \(\)&lt;&gt;@,;:\\&quot;/\[\]\?=]')


def _splitparam(param):
    # Split header parameters.  BAW: this may be too simple.  It isn't
    # strictly RFC 2045 (section 5.1) compliant, but it catches most headers
    # found in the wild.  We may eventually need a full fledged parser.
    # RDM: we might have a Header here; for now just stringify it.
    a, sep, b = str(param).partition(';')
    if not sep:
        return a.strip(), None
    return a.strip(), b.strip()

def _formatparam(param, value=None, quote=True):
    &quot;&quot;&quot;Convenience function to format and return a key=value pair.

    This will quote the value if needed or if quote is true.  If value is a
    three tuple (charset, language, value), it will be encoded according
    to RFC2231 rules.  If it contains non-ascii characters it will likewise
    be encoded according to RFC2231 rules, using the utf-8 charset and
    a null language.
    &quot;&quot;&quot;
    if value is not None and len(value) &gt; 0:
        # A tuple is used for RFC 2231 encoded parameter values where items
        # are (charset, language, value).  charset is a string, not a Charset
        # instance.  RFC 2231 encoded values are never quoted, per RFC.
        if isinstance(value, tuple):
            # Encode as per RFC 2231
            param += '*'
            value = utils.encode_rfc2231(value[2], value[0], value[1])
            return '%s=%s' % (param, value)
        else:
            try:
                value.encode('ascii')
            except UnicodeEncodeError:
                param += '*'
                value = utils.encode_rfc2231(value, 'utf-8', '')
                return '%s=%s' % (param, value)
        # BAW: Please check this.  I think that if quote is set it should
        # force quoting even if not necessary.
        if quote or tspecials.search(value):
            return '%s=&quot;%s&quot;' % (param, utils.quote(value))
        else:
            return '%s=%s' % (param, value)
    else:
        return param

def _parseparam(s):
    # RDM This might be a Header, so for now stringify it.
    s = ';' + str(s)
    plist = []
    while s[:1] == ';':
        s = s[1:]
        end = s.find(';')
        while end &gt; 0 and (s.count('&quot;', 0, end) - s.count('\\&quot;', 0, end)) % 2:
            end = s.find(';', end + 1)
        if end &lt; 0:
            end = len(s)
        f = s[:end]
        if '=' in f:
            i = f.index('=')
            f = f[:i].strip().lower() + '=' + f[i+1:].strip()
        plist.append(f.strip())
        s = s[end:]
    return plist


def _unquotevalue(value):
    # This is different than utils.collapse_rfc2231_value() because it doesn't
    # try to convert the value to a unicode.  Message.get_param() and
    # Message.get_params() are both currently defined to return the tuple in
    # the face of RFC 2231 parameters.
    if isinstance(value, tuple):
        return value[0], value[1], utils.unquote(value[2])
    else:
        return utils.unquote(value)


def _decode_uu(encoded):
    &quot;&quot;&quot;Decode uuencoded data.&quot;&quot;&quot;
    decoded_lines = []
    encoded_lines_iter = iter(encoded.splitlines())
    for line in encoded_lines_iter:
        if line.startswith(b&quot;begin &quot;):
            mode, _, path = line.removeprefix(b&quot;begin &quot;).partition(b&quot; &quot;)
            try:
                int(mode, base=8)
            except ValueError:
                continue
            else:
                break
    else:
        raise ValueError(&quot;`begin` line not found&quot;)
    for line in encoded_lines_iter:
        if not line:
            raise ValueError(&quot;Truncated input&quot;)
        elif line.strip(b' \t\r\n\f') == b'end':
            break
        try:
            decoded_line = binascii.a2b_uu(line)
        except binascii.Error:
            # Workaround for broken uuencoders by /Fredrik Lundh
            nbytes = (((line[0]-32) &amp; 63) * 4 + 5) // 3
            decoded_line = binascii.a2b_uu(line[:nbytes])
        decoded_lines.append(decoded_line)

    return b''.join(decoded_lines)


class Message:
    &quot;&quot;&quot;Basic message object.

    A message object is defined as something that has a bunch of RFC 2822
    headers and a payload.  It may optionally have an envelope header
    (a.k.a. Unix-From or From_ header).  If the message is a container (i.e. a
    multipart or a message/rfc822), then the payload is a list of Message
    objects, otherwise it is a string.

    Message objects implement part of the `mapping' interface, which assumes
    there is exactly one occurrence of the header per message.  Some headers
    do in fact appear multiple times (e.g. Received) and for those headers,
    you must use the explicit API to set or get all the headers.  Not all of
    the mapping methods are implemented.
    &quot;&quot;&quot;
    def __init__(self, policy=compat32):
        self.policy = policy
        self._headers = []
        self._unixfrom = None
        self._payload = None
        self._charset = None
        # Defaults for multipart messages
        self.preamble = self.epilogue = None
        self.defects = []
        # Default content type
        self._default_type = 'text/plain'

    def __str__(self):
        &quot;&quot;&quot;Return the entire formatted message as a string.
        &quot;&quot;&quot;
        return self.as_string()

    def as_string(self, unixfrom=False, maxheaderlen=0, policy=None):
        &quot;&quot;&quot;Return the entire formatted message as a string.

        Optional 'unixfrom', when true, means include the Unix From_ envelope
        header.  For backward compatibility reasons, if maxheaderlen is
        not specified it defaults to 0, so you must override it explicitly
        if you want a different maxheaderlen.  'policy' is passed to the
        Generator instance used to serialize the message; if it is not
        specified the policy associated with the message instance is used.

        If the message object contains binary data that is not encoded
        according to RFC standards, the non-compliant data will be replaced by
        unicode &quot;unknown character&quot; code points.
        &quot;&quot;&quot;
        from email.generator import Generator
        policy = self.policy if policy is None else policy
        fp = StringIO()
        g = Generator(fp,
                      mangle_from_=False,
                      maxheaderlen=maxheaderlen,
                      policy=policy)
        g.flatten(self, unixfrom=unixfrom)
        return fp.getvalue()

    def __bytes__(self):
        &quot;&quot;&quot;Return the entire formatted message as a bytes object.
        &quot;&quot;&quot;
        return self.as_bytes()

    def as_bytes(self, unixfrom=False, policy=None):
        &quot;&quot;&quot;Return the entire formatted message as a bytes object.

        Optional 'unixfrom', when true, means include the Unix From_ envelope
        header.  'policy' is passed to the BytesGenerator instance used to
        serialize the message; if not specified the policy associated with
        the message instance is used.
        &quot;&quot;&quot;
        from email.generator import BytesGenerator
        policy = self.policy if policy is None else policy
        fp = BytesIO()
        g = BytesGenerator(fp, mangle_from_=False, policy=policy)
        g.flatten(self, unixfrom=unixfrom)
        return fp.getvalue()

    def is_multipart(self):
        &quot;&quot;&quot;Return True if the message consists of multiple parts.&quot;&quot;&quot;
        return isinstance(self._payload, list)

    #
    # Unix From_ line
    #
    def set_unixfrom(self, unixfrom):
        self._unixfrom = unixfrom

    def get_unixfrom(self):
        return self._unixfrom

    #
    # Payload manipulation.
    #
    def attach(self, payload):
        &quot;&quot;&quot;Add the given payload to the current payload.

        The current payload will always be a list of objects after this method
        is called.  If you want to set the payload to a scalar object, use
        set_payload() instead.
        &quot;&quot;&quot;
        if self._payload is None:
            self._payload = [payload]
        else:
            try:
                self._payload.append(payload)
            except AttributeError:
                raise TypeError(&quot;Attach is not valid on a message with a&quot;
                                &quot; non-multipart payload&quot;)

    def get_payload(self, i=None, decode=False):
        &quot;&quot;&quot;Return a reference to the payload.

        The payload will either be a list object or a string.  If you mutate
        the list object, you modify the message's payload in place.  Optional
        i returns that index into the payload.

        Optional decode is a flag indicating whether the payload should be
        decoded or not, according to the Content-Transfer-Encoding header
        (default is False).

        When True and the message is not a multipart, the payload will be
        decoded if this header's value is `quoted-printable' or `base64'.  If
        some other encoding is used, or the header is missing, or if the
        payload has bogus data (i.e. bogus base64 or uuencoded data), the
        payload is returned as-is.

        If the message is a multipart and the decode flag is True, then None
        is returned.
        &quot;&quot;&quot;
        # Here is the logic table for this code, based on the email5.0.0 code:
        #   i     decode  is_multipart  result
        # ------  ------  ------------  ------------------------------
        #  None   True    True          None
        #   i     True    True          None
        #  None   False   True          _payload (a list)
        #   i     False   True          _payload element i (a Message)
        #   i     False   False         error (not a list)
        #   i     True    False         error (not a list)
        #  None   False   False         _payload
        #  None   True    False         _payload decoded (bytes)
        # Note that Barry planned to factor out the 'decode' case, but that
        # isn't so easy now that we handle the 8 bit data, which needs to be
        # converted in both the decode and non-decode path.
        if self.is_multipart():
            if decode:
                return None
            if i is None:
                return self._payload
            else:
                return self._payload[i]
        # For backward compatibility, Use isinstance and this error message
        # instead of the more logical is_multipart test.
        if i is not None and not isinstance(self._payload, list):
            raise TypeError('Expected list, got %s' % type(self._payload))
        payload = self._payload
        # cte might be a Header, so for now stringify it.
        cte = str(self.get('content-transfer-encoding', '')).lower()
        # payload may be bytes here.
        if not decode:
            if isinstance(payload, str) and utils._has_surrogates(payload):
                try:
                    bpayload = payload.encode('ascii', 'surrogateescape')
                    try:
                        payload = bpayload.decode(self.get_param('charset', 'ascii'), 'replace')
                    except LookupError:
                        payload = bpayload.decode('ascii', 'replace')
                except UnicodeEncodeError:
                    pass
            return payload
        if isinstance(payload, str):
            try:
                bpayload = payload.encode('ascii', 'surrogateescape')
            except UnicodeEncodeError:
                # This won't happen for RFC compliant messages (messages
                # containing only ASCII code points in the unicode input).
                # If it does happen, turn the string into bytes in a way
                # guaranteed not to fail.
                bpayload = payload.encode('raw-unicode-escape')
        if cte == 'quoted-printable':
            return quopri.decodestring(bpayload)
        elif cte == 'base64':
            # XXX: this is a bit of a hack; decode_b should probably be factored
            # out somewhere, but I haven't figured out where yet.
            value, defects = decode_b(b''.join(bpayload.splitlines()))
            for defect in defects:
                self.policy.handle_defect(self, defect)
            return value
        elif cte in ('x-uuencode', 'uuencode', 'uue', 'x-uue'):
            try:
                return _decode_uu(bpayload)
            except ValueError:
                # Some decoding problem.
                return bpayload
        if isinstance(payload, str):
            return bpayload
        return payload

    def set_payload(self, payload, charset=None):
        &quot;&quot;&quot;Set the payload to the given value.

        Optional charset sets the message's default character set.  See
        set_charset() for details.
        &quot;&quot;&quot;
        if hasattr(payload, 'encode'):
            if charset is None:
                self._payload = payload
                return
            if not isinstance(charset, Charset):
                charset = Charset(charset)
            payload = payload.encode(charset.output_charset, 'surrogateescape')
        if hasattr(payload, 'decode'):
            self._payload = payload.decode('ascii', 'surrogateescape')
        else:
            self._payload = payload
        if charset is not None:
            self.set_charset(charset)

    def set_charset(self, charset):
        &quot;&quot;&quot;Set the charset of the payload to a given character set.

        charset can be a Charset instance, a string naming a character set, or
        None.  If it is a string it will be converted to a Charset instance.
        If charset is None, the charset parameter will be removed from the
        Content-Type field.  Anything else will generate a TypeError.

        The message will be assumed to be of type text/* encoded with
        charset.input_charset.  It will be converted to charset.output_charset
        and encoded properly, if needed, when generating the plain text
        representation of the message.  MIME headers (MIME-Version,
        Content-Type, Content-Transfer-Encoding) will be added as needed.
        &quot;&quot;&quot;
        if charset is None:
            self.del_param('charset')
            self._charset = None
            return
        if not isinstance(charset, Charset):
            charset = Charset(charset)
        self._charset = charset
        if 'MIME-Version' not in self:
            self.add_header('MIME-Version', '1.0')
        if 'Content-Type' not in self:
            self.add_header('Content-Type', 'text/plain',
                            charset=charset.get_output_charset())
        else:
            self.set_param('charset', charset.get_output_charset())
        if charset != charset.get_output_charset():
            self._payload = charset.body_encode(self._payload)
        if 'Content-Transfer-Encoding' not in self:
            cte = charset.get_body_encoding()
            try:
                cte(self)
            except TypeError:
                # This 'if' is for backward compatibility, it allows unicode
                # through even though that won't work correctly if the
                # message is serialized.
                payload = self._payload
                if payload:
                    try:
                        payload = payload.encode('ascii', 'surrogateescape')
                    except UnicodeError:
                        payload = payload.encode(charset.output_charset)
                self._payload = charset.body_encode(payload)
                self.add_header('Content-Transfer-Encoding', cte)

    def get_charset(self):
        &quot;&quot;&quot;Return the Charset instance associated with the message's payload.
        &quot;&quot;&quot;
        return self._charset

    #
    # MAPPING INTERFACE (partial)
    #
    def __len__(self):
        &quot;&quot;&quot;Return the total number of headers, including duplicates.&quot;&quot;&quot;
        return len(self._headers)

    def __getitem__(self, name):
        &quot;&quot;&quot;Get a header value.

        Return None if the header is missing instead of raising an exception.

        Note that if the header appeared multiple times, exactly which
        occurrence gets returned is undefined.  Use get_all() to get all
        the values matching a header field name.
        &quot;&quot;&quot;
        return self.get(name)

    def __setitem__(self, name, val):
        &quot;&quot;&quot;Set the value of a header.

        Note: this does not overwrite an existing header with the same field
        name.  Use __delitem__() first to delete any existing headers.
        &quot;&quot;&quot;
        max_count = self.policy.header_max_count(name)
        if max_count:
            lname = name.lower()
            found = 0
            for k, v in self._headers:
                if k.lower() == lname:
                    found += 1
                    if found &gt;= max_count:
                        raise ValueError(&quot;There may be at most {} {} headers &quot;
                                         &quot;in a message&quot;.format(max_count, name))
        self._headers.append(self.policy.header_store_parse(name, val))

    def __delitem__(self, name):
        &quot;&quot;&quot;Delete all occurrences of a header, if present.

        Does not raise an exception if the header is missing.
        &quot;&quot;&quot;
        name = name.lower()
        newheaders = []
        for k, v in self._headers:
            if k.lower() != name:
                newheaders.append((k, v))
        self._headers = newheaders

    def __contains__(self, name):
        return name.lower() in [k.lower() for k, v in self._headers]

    def __iter__(self):
        for field, value in self._headers:
            yield field

    def keys(self):
        &quot;&quot;&quot;Return a list of all the message's header field names.

        These will be sorted in the order they appeared in the original
        message, or were added to the message, and may contain duplicates.
        Any fields deleted and re-inserted are always appended to the header
        list.
        &quot;&quot;&quot;
        return [k for k, v in self._headers]

    def values(self):
        &quot;&quot;&quot;Return a list of all the message's header values.

        These will be sorted in the order they appeared in the original
        message, or were added to the message, and may contain duplicates.
        Any fields deleted and re-inserted are always appended to the header
        list.
        &quot;&quot;&quot;
        return [self.policy.header_fetch_parse(k, v)
                for k, v in self._headers]

    def items(self):
        &quot;&quot;&quot;Get all the message's header fields and values.

        These will be sorted in the order they appeared in the original
        message, or were added to the message, and may contain duplicates.
        Any fields deleted and re-inserted are always appended to the header
        list.
        &quot;&quot;&quot;
        return [(k, self.policy.header_fetch_parse(k, v))
                for k, v in self._headers]

    def get(self, name, failobj=None):
        &quot;&quot;&quot;Get a header value.

        Like __getitem__() but return failobj instead of None when the field
        is missing.
        &quot;&quot;&quot;
        name = name.lower()
        for k, v in self._headers:
            if k.lower() == name:
                return self.policy.header_fetch_parse(k, v)
        return failobj

    #
    # &quot;Internal&quot; methods (public API, but only intended for use by a parser
    # or generator, not normal application code.
    #

    def set_raw(self, name, value):
        &quot;&quot;&quot;Store name and value in the model without modification.

        This is an &quot;internal&quot; API, intended only for use by a parser.
        &quot;&quot;&quot;
        self._headers.append((name, value))

    def raw_items(self):
        &quot;&quot;&quot;Return the (name, value) header pairs without modification.

        This is an &quot;internal&quot; API, intended only for use by a generator.
        &quot;&quot;&quot;
        return iter(self._headers.copy())

    #
    # Additional useful stuff
    #

    def get_all(self, name, failobj=None):
        &quot;&quot;&quot;Return a list of all the values for the named field.

        These will be sorted in the order they appeared in the original
        message, and may contain duplicates.  Any fields deleted and
        re-inserted are always appended to the header list.

        If no such fields exist, failobj is returned (defaults to None).
        &quot;&quot;&quot;
        values = []
        name = name.lower()
        for k, v in self._headers:
            if k.lower() == name:
                values.append(self.policy.header_fetch_parse(k, v))
        if not values:
            return failobj
        return values

    def add_header(self, _name, _value, **_params):
        &quot;&quot;&quot;Extended header setting.

        name is the header field to add.  keyword arguments can be used to set
        additional parameters for the header field, with underscores converted
        to dashes.  Normally the parameter will be added as key=&quot;value&quot; unless
        value is None, in which case only the key will be added.  If a
        parameter value contains non-ASCII characters it can be specified as a
        three-tuple of (charset, language, value), in which case it will be
        encoded according to RFC2231 rules.  Otherwise it will be encoded using
        the utf-8 charset and a language of ''.

        Examples:

        msg.add_header('content-disposition', 'attachment', filename='bud.gif')
        msg.add_header('content-disposition', 'attachment',
                       filename=('utf-8', '', Fußballer.ppt'))
        msg.add_header('content-disposition', 'attachment',
                       filename='Fußballer.ppt'))
        &quot;&quot;&quot;
        parts = []
        for k, v in _params.items():
            if v is None:
                parts.append(k.replace('_', '-'))
            else:
                parts.append(_formatparam(k.replace('_', '-'), v))
        if _value is not None:
            parts.insert(0, _value)
        self[_name] = SEMISPACE.join(parts)

    def replace_header(self, _name, _value):
        &quot;&quot;&quot;Replace a header.

        Replace the first matching header found in the message, retaining
        header order and case.  If no matching header was found, a KeyError is
        raised.
        &quot;&quot;&quot;
        _name = _name.lower()
        for i, (k, v) in zip(range(len(self._headers)), self._headers):
            if k.lower() == _name:
                self._headers[i] = self.policy.header_store_parse(k, _value)
                break
        else:
            raise KeyError(_name)

    #
    # Use these three methods instead of the three above.
    #

    def get_content_type(self):
        &quot;&quot;&quot;Return the message's content type.

        The returned string is coerced to lower case of the form
        `maintype/subtype'.  If there was no Content-Type header in the
        message, the default type as given by get_default_type() will be
        returned.  Since according to RFC 2045, messages always have a default
        type this will always return a value.

        RFC 2045 defines a message's default type to be text/plain unless it
        appears inside a multipart/digest container, in which case it would be
        message/rfc822.
        &quot;&quot;&quot;
        missing = object()
        value = self.get('content-type', missing)
        if value is missing:
            # This should have no parameters
            return self.get_default_type()
        ctype = _splitparam(value)[0].lower()
        # RFC 2045, section 5.2 says if its invalid, use text/plain
        if ctype.count('/') != 1:
            return 'text/plain'
        return ctype

    def get_content_maintype(self):
        &quot;&quot;&quot;Return the message's main content type.

        This is the `maintype' part of the string returned by
        get_content_type().
        &quot;&quot;&quot;
        ctype = self.get_content_type()
        return ctype.split('/')[0]

    def get_content_subtype(self):
        &quot;&quot;&quot;Returns the message's sub-content type.

        This is the `subtype' part of the string returned by
        get_content_type().
        &quot;&quot;&quot;
        ctype = self.get_content_type()
        return ctype.split('/')[1]

    def get_default_type(self):
        &quot;&quot;&quot;Return the `default' content type.

        Most messages have a default content type of text/plain, except for
        messages that are subparts of multipart/digest containers.  Such
        subparts have a default content type of message/rfc822.
        &quot;&quot;&quot;
        return self._default_type

    def set_default_type(self, ctype):
        &quot;&quot;&quot;Set the `default' content type.

        ctype should be either &quot;text/plain&quot; or &quot;message/rfc822&quot;, although this
        is not enforced.  The default content type is not stored in the
        Content-Type header.
        &quot;&quot;&quot;
        self._default_type = ctype

    def _get_params_preserve(self, failobj, header):
        # Like get_params() but preserves the quoting of values.  BAW:
        # should this be part of the public interface?
        missing = object()
        value = self.get(header, missing)
        if value is missing:
            return failobj
        params = []
        for p in _parseparam(value):
            try:
                name, val = p.split('=', 1)
                name = name.strip()
                val = val.strip()
            except ValueError:
                # Must have been a bare attribute
                name = p.strip()
                val = ''
            params.append((name, val))
        params = utils.decode_params(params)
        return params

    def get_params(self, failobj=None, header='content-type', unquote=True):
        &quot;&quot;&quot;Return the message's Content-Type parameters, as a list.

        The elements of the returned list are 2-tuples of key/value pairs, as
        split on the `=' sign.  The left hand side of the `=' is the key,
        while the right hand side is the value.  If there is no `=' sign in
        the parameter the value is the empty string.  The value is as
        described in the get_param() method.

        Optional failobj is the object to return if there is no Content-Type
        header.  Optional header is the header to search instead of
        Content-Type.  If unquote is True, the value is unquoted.
        &quot;&quot;&quot;
        missing = object()
        params = self._get_params_preserve(missing, header)
        if params is missing:
            return failobj
        if unquote:
            return [(k, _unquotevalue(v)) for k, v in params]
        else:
            return params

    def get_param(self, param, failobj=None, header='content-type',
                  unquote=True):
        &quot;&quot;&quot;Return the parameter value if found in the Content-Type header.

        Optional failobj is the object to return if there is no Content-Type
        header, or the Content-Type header has no such parameter.  Optional
        header is the header to search instead of Content-Type.

        Parameter keys are always compared case insensitively.  The return
        value can either be a string, or a 3-tuple if the parameter was RFC
        2231 encoded.  When it's a 3-tuple, the elements of the value are of
        the form (CHARSET, LANGUAGE, VALUE).  Note that both CHARSET and
        LANGUAGE can be None, in which case you should consider VALUE to be
        encoded in the us-ascii charset.  You can usually ignore LANGUAGE.
        The parameter value (either the returned string, or the VALUE item in
        the 3-tuple) is always unquoted, unless unquote is set to False.

        If your application doesn't care whether the parameter was RFC 2231
        encoded, it can turn the return value into a string as follows:

            rawparam = msg.get_param('foo')
            param = email.utils.collapse_rfc2231_value(rawparam)

        &quot;&quot;&quot;
        if header not in self:
            return failobj
        for k, v in self._get_params_preserve(failobj, header):
            if k.lower() == param.lower():
                if unquote:
                    return _unquotevalue(v)
                else:
                    return v
        return failobj

    def set_param(self, param, value, header='Content-Type', requote=True,
                  charset=None, language='', replace=False):
        &quot;&quot;&quot;Set a parameter in the Content-Type header.

        If the parameter already exists in the header, its value will be
        replaced with the new value.

        If header is Content-Type and has not yet been defined for this
        message, it will be set to &quot;text/plain&quot; and the new parameter and
        value will be appended as per RFC 2045.

        An alternate header can be specified in the header argument, and all
        parameters will be quoted as necessary unless requote is False.

        If charset is specified, the parameter will be encoded according to RFC
        2231.  Optional language specifies the RFC 2231 language, defaulting
        to the empty string.  Both charset and language should be strings.
        &quot;&quot;&quot;
        if not isinstance(value, tuple) and charset:
            value = (charset, language, value)

        if header not in self and header.lower() == 'content-type':
            ctype = 'text/plain'
        else:
            ctype = self.get(header)
        if not self.get_param(param, header=header):
            if not ctype:
                ctype = _formatparam(param, value, requote)
            else:
                ctype = SEMISPACE.join(
                    [ctype, _formatparam(param, value, requote)])
        else:
            ctype = ''
            for old_param, old_value in self.get_params(header=header,
                                                        unquote=requote):
                append_param = ''
                if old_param.lower() == param.lower():
                    append_param = _formatparam(param, value, requote)
                else:
                    append_param = _formatparam(old_param, old_value, requote)
                if not ctype:
                    ctype = append_param
                else:
                    ctype = SEMISPACE.join([ctype, append_param])
        if ctype != self.get(header):
            if replace:
                self.replace_header(header, ctype)
            else:
                del self[header]
                self[header] = ctype

    def del_param(self, param, header='content-type', requote=True):
        &quot;&quot;&quot;Remove the given parameter completely from the Content-Type header.

        The header will be re-written in place without the parameter or its
        value. All values will be quoted as necessary unless requote is
        False.  Optional header specifies an alternative to the Content-Type
        header.
        &quot;&quot;&quot;
        if header not in self:
            return
        new_ctype = ''
        for p, v in self.get_params(header=header, unquote=requote):
            if p.lower() != param.lower():
                if not new_ctype:
                    new_ctype = _formatparam(p, v, requote)
                else:
                    new_ctype = SEMISPACE.join([new_ctype,
                                                _formatparam(p, v, requote)])
        if new_ctype != self.get(header):
            del self[header]
            self[header] = new_ctype

    def set_type(self, type, header='Content-Type', requote=True):
        &quot;&quot;&quot;Set the main type and subtype for the Content-Type header.

        type must be a string in the form &quot;maintype/subtype&quot;, otherwise a
        ValueError is raised.

        This method replaces the Content-Type header, keeping all the
        parameters in place.  If requote is False, this leaves the existing
        header's quoting as is.  Otherwise, the parameters will be quoted (the
        default).

        An alternative header can be specified in the header argument.  When
        the Content-Type header is set, we'll always also add a MIME-Version
        header.
        &quot;&quot;&quot;
        # BAW: should we be strict?
        if not type.count('/') == 1:
            raise ValueError
        # Set the Content-Type, you get a MIME-Version
        if header.lower() == 'content-type':
            del self['mime-version']
            self['MIME-Version'] = '1.0'
        if header not in self:
            self[header] = type
            return
        params = self.get_params(header=header, unquote=requote)
        del self[header]
        self[header] = type
        # Skip the first param; it's the old type.
        for p, v in params[1:]:
            self.set_param(p, v, header, requote)

    def get_filename(self, failobj=None):
        &quot;&quot;&quot;Return the filename associated with the payload if present.

        The filename is extracted from the Content-Disposition header's
        `filename' parameter, and it is unquoted.  If that header is missing
        the `filename' parameter, this method falls back to looking for the
        `name' parameter.
        &quot;&quot;&quot;
        missing = object()
        filename = self.get_param('filename', missing, 'content-disposition')
        if filename is missing:
            filename = self.get_param('name', missing, 'content-type')
        if filename is missing:
            return failobj
        return utils.collapse_rfc2231_value(filename).strip()

    def get_boundary(self, failobj=None):
        &quot;&quot;&quot;Return the boundary associated with the payload if present.

        The boundary is extracted from the Content-Type header's `boundary'
        parameter, and it is unquoted.
        &quot;&quot;&quot;
        missing = object()
        boundary = self.get_param('boundary', missing)
        if boundary is missing:
            return failobj
        # RFC 2046 says that boundaries may begin but not end in w/s
        return utils.collapse_rfc2231_value(boundary).rstrip()

    def set_boundary(self, boundary):
        &quot;&quot;&quot;Set the boundary parameter in Content-Type to 'boundary'.

        This is subtly different than deleting the Content-Type header and
        adding a new one with a new boundary parameter via add_header().  The
        main difference is that using the set_boundary() method preserves the
        order of the Content-Type header in the original message.

        HeaderParseError is raised if the message has no Content-Type header.
        &quot;&quot;&quot;
        missing = object()
        params = self._get_params_preserve(missing, 'content-type')
        if params is missing:
            # There was no Content-Type header, and we don't know what type
            # to set it to, so raise an exception.
            raise errors.HeaderParseError('No Content-Type header found')
        newparams = []
        foundp = False
        for pk, pv in params:
            if pk.lower() == 'boundary':
                newparams.append(('boundary', '&quot;%s&quot;' % boundary))
                foundp = True
            else:
                newparams.append((pk, pv))
        if not foundp:
            # The original Content-Type header had no boundary attribute.
            # Tack one on the end.  BAW: should we raise an exception
            # instead???
            newparams.append(('boundary', '&quot;%s&quot;' % boundary))
        # Replace the existing Content-Type header with the new value
        newheaders = []
        for h, v in self._headers:
            if h.lower() == 'content-type':
                parts = []
                for k, v in newparams:
                    if v == '':
                        parts.append(k)
                    else:
                        parts.append('%s=%s' % (k, v))
                val = SEMISPACE.join(parts)
                newheaders.append(self.policy.header_store_parse(h, val))

            else:
                newheaders.append((h, v))
        self._headers = newheaders

    def get_content_charset(self, failobj=None):
        &quot;&quot;&quot;Return the charset parameter of the Content-Type header.

        The returned string is always coerced to lower case.  If there is no
        Content-Type header, or if that header has no charset parameter,
        failobj is returned.
        &quot;&quot;&quot;
        missing = object()
        charset = self.get_param('charset', missing)
        if charset is missing:
            return failobj
        if isinstance(charset, tuple):
            # RFC 2231 encoded, so decode it, and it better end up as ascii.
            pcharset = charset[0] or 'us-ascii'
            try:
                # LookupError will be raised if the charset isn't known to
                # Python.  UnicodeError will be raised if the encoded text
                # contains a character not in the charset.
                as_bytes = charset[2].encode('raw-unicode-escape')
                charset = str(as_bytes, pcharset)
            except (LookupError, UnicodeError):
                charset = charset[2]
        # charset characters must be in us-ascii range
        try:
            charset.encode('us-ascii')
        except UnicodeError:
            return failobj
        # RFC 2046, $4.1.2 says charsets are not case sensitive
        return charset.lower()

    def get_charsets(self, failobj=None):
        &quot;&quot;&quot;Return a list containing the charset(s) used in this message.

        The returned list of items describes the Content-Type headers'
        charset parameter for this message and all the subparts in its
        payload.

        Each item will either be a string (the value of the charset parameter
        in the Content-Type header of that part) or the value of the
        'failobj' parameter (defaults to None), if the part does not have a
        main MIME type of &quot;text&quot;, or the charset is not defined.

        The list will contain one string for each part of the message, plus
        one for the container message (i.e. self), so that a non-multipart
        message will still return a list of length 1.
        &quot;&quot;&quot;
        return [part.get_content_charset(failobj) for part in self.walk()]

    def get_content_disposition(self):
        &quot;&quot;&quot;Return the message's content-disposition if it exists, or None.

        The return values can be either 'inline', 'attachment' or None
        according to the rfc2183.
        &quot;&quot;&quot;
        value = self.get('content-disposition')
        if value is None:
            return None
        c_d = _splitparam(value)[0].lower()
        return c_d

    # I.e. def walk(self): ...
    from email.iterators import walk


class MIMEPart(Message):

    def __init__(self, policy=None):
        if policy is None:
            from email.policy import default
            policy = default
        super().__init__(policy)


    def as_string(self, unixfrom=False, maxheaderlen=None, policy=None):
        &quot;&quot;&quot;Return the entire formatted message as a string.

        Optional 'unixfrom', when true, means include the Unix From_ envelope
        header.  maxheaderlen is retained for backward compatibility with the
        base Message class, but defaults to None, meaning that the policy value
        for max_line_length controls the header maximum length.  'policy' is
        passed to the Generator instance used to serialize the message; if it
        is not specified the policy associated with the message instance is
        used.
        &quot;&quot;&quot;
        policy = self.policy if policy is None else policy
        if maxheaderlen is None:
            maxheaderlen = policy.max_line_length
        return super().as_string(unixfrom, maxheaderlen, policy)

    def __str__(self):
        return self.as_string(policy=self.policy.clone(utf8=True))

    def is_attachment(self):
        c_d = self.get('content-disposition')
        return False if c_d is None else c_d.content_disposition == 'attachment'

    def _find_body(self, part, preferencelist):
        if part.is_attachment():
            return
        maintype, subtype = part.get_content_type().split('/')
        if maintype == 'text':
            if subtype in preferencelist:
                yield (preferencelist.index(subtype), part)
            return
        if maintype != 'multipart' or not self.is_multipart():
            return
        if subtype != 'related':
            for subpart in part.iter_parts():
                yield from self._find_body(subpart, preferencelist)
            return
        if 'related' in preferencelist:
            yield (preferencelist.index('related'), part)
        candidate = None
        start = part.get_param('start')
        if start:
            for subpart in part.iter_parts():
                if subpart['content-id'] == start:
                    candidate = subpart
                    break
        if candidate is None:
            subparts = part.get_payload()
            candidate = subparts[0] if subparts else None
        if candidate is not None:
            yield from self._find_body(candidate, preferencelist)

    def get_body(self, preferencelist=('related', 'html', 'plain')):
        &quot;&quot;&quot;Return best candidate mime part for display as 'body' of message.

        Do a depth first search, starting with self, looking for the first part
        matching each of the items in preferencelist, and return the part
        corresponding to the first item that has a match, or None if no items
        have a match.  If 'related' is not included in preferencelist, consider
        the root part of any multipart/related encountered as a candidate
        match.  Ignore parts with 'Content-Disposition: attachment'.
        &quot;&quot;&quot;
        best_prio = len(preferencelist)
        body = None
        for prio, part in self._find_body(self, preferencelist):
            if prio &lt; best_prio:
                best_prio = prio
                body = part
                if prio == 0:
                    break
        return body

    _body_types = {('text', 'plain'),
                   ('text', 'html'),
                   ('multipart', 'related'),
                   ('multipart', 'alternative')}
    def iter_attachments(self):
        &quot;&quot;&quot;Return an iterator over the non-main parts of a multipart.

        Skip the first of each occurrence of text/plain, text/html,
        multipart/related, or multipart/alternative in the multipart (unless
        they have a 'Content-Disposition: attachment' header) and include all
        remaining subparts in the returned iterator.  When applied to a
        multipart/related, return all parts except the root part.  Return an
        empty iterator when applied to a multipart/alternative or a
        non-multipart.
        &quot;&quot;&quot;
        maintype, subtype = self.get_content_type().split('/')
        if maintype != 'multipart' or subtype == 'alternative':
            return
        payload = self.get_payload()
        # Certain malformed messages can have content type set to `multipart/*`
        # but still have single part body, in which case payload.copy() can
        # fail with AttributeError.
        try:
            parts = payload.copy()
        except AttributeError:
            # payload is not a list, it is most probably a string.
            return

        if maintype == 'multipart' and subtype == 'related':
            # For related, we treat everything but the root as an attachment.
            # The root may be indicated by 'start'; if there's no start or we
            # can't find the named start, treat the first subpart as the root.
            start = self.get_param('start')
            if start:
                found = False
                attachments = []
                for part in parts:
                    if part.get('content-id') == start:
                        found = True
                    else:
                        attachments.append(part)
                if found:
                    yield from attachments
                    return
            parts.pop(0)
            yield from parts
            return
        # Otherwise we more or less invert the remaining logic in get_body.
        # This only really works in edge cases (ex: non-text related or
        # alternatives) if the sending agent sets content-disposition.
        seen = []   # Only skip the first example of each candidate type.
        for part in parts:
            maintype, subtype = part.get_content_type().split('/')
            if ((maintype, subtype) in self._body_types and
                    not part.is_attachment() and subtype not in seen):
                seen.append(subtype)
                continue
            yield part

    def iter_parts(self):
        &quot;&quot;&quot;Return an iterator over all immediate subparts of a multipart.

        Return an empty iterator for a non-multipart.
        &quot;&quot;&quot;
        if self.is_multipart():
            yield from self.get_payload()

    def get_content(self, *args, content_manager=None, **kw):
        if content_manager is None:
            content_manager = self.policy.content_manager
        return content_manager.get_content(self, *args, **kw)

    def set_content(self, *args, content_manager=None, **kw):
        if content_manager is None:
            content_manager = self.policy.content_manager
        content_manager.set_content(self, *args, **kw)

    def _make_multipart(self, subtype, disallowed_subtypes, boundary):
        if self.get_content_maintype() == 'multipart':
            existing_subtype = self.get_content_subtype()
            disallowed_subtypes = disallowed_subtypes + (subtype,)
            if existing_subtype in disallowed_subtypes:
                raise ValueError(&quot;Cannot convert {} to {}&quot;.format(
                    existing_subtype, subtype))
        keep_headers = []
        part_headers = []
        for name, value in self._headers:
            if name.lower().startswith('content-'):
                part_headers.append((name, value))
            else:
                keep_headers.append((name, value))
        if part_headers:
            # There is existing content, move it to the first subpart.
            part = type(self)(policy=self.policy)
            part._headers = part_headers
            part._payload = self._payload
            self._payload = [part]
        else:
            self._payload = []
        self._headers = keep_headers
        self['Content-Type'] = 'multipart/' + subtype
        if boundary is not None:
            self.set_param('boundary', boundary)

    def make_related(self, boundary=None):
        self._make_multipart('related', ('alternative', 'mixed'), boundary)

    def make_alternative(self, boundary=None):
        self._make_multipart('alternative', ('mixed',), boundary)

    def make_mixed(self, boundary=None):
        self._make_multipart('mixed', (), boundary)

    def _add_multipart(self, _subtype, *args, _disp=None, **kw):
        if (self.get_content_maintype() != 'multipart' or
                self.get_content_subtype() != _subtype):
            getattr(self, 'make_' + _subtype)()
        part = type(self)(policy=self.policy)
        part.set_content(*args, **kw)
        if _disp and 'content-disposition' not in part:
            part['Content-Disposition'] = _disp
        self.attach(part)

    def add_related(self, *args, **kw):
        self._add_multipart('related', *args, _disp='inline', **kw)

    def add_alternative(self, *args, **kw):
        self._add_multipart('alternative', *args, **kw)

    def add_attachment(self, *args, **kw):
        self._add_multipart('mixed', *args, _disp='attachment', **kw)

    def clear(self):
        self._headers = []
        self._payload = None

    def clear_content(self):
        self._headers = [(n, v) for n, v in self._headers
                         if not n.lower().startswith('content-')]
        self._payload = None


class EmailMessage(MIMEPart):

    def set_content(self, *args, **kw):
        super().set_content(*args, **kw)
        if 'MIME-Version' not in self:
            self['MIME-Version'] = '1.0'
                                                                                                   opt/alt/python313/lib64/python3.13/email/mime/message.py                                            0000644                 00000002443 15052033311 0016454 0                                                                                                    ustar 00                                                                                                                                                                                                                                                       # Copyright (C) 2001-2006 Python Software Foundation
# Author: Barry Warsaw
# Contact: email-sig@python.org

&quot;&quot;&quot;Class representing message/* MIME documents.&quot;&quot;&quot;

__all__ = ['MIMEMessage']

from email import message
from email.mime.nonmultipart import MIMENonMultipart


class MIMEMessage(MIMENonMultipart):
    &quot;&quot;&quot;Class representing message/* MIME documents.&quot;&quot;&quot;

    def __init__(self, _msg, _subtype='rfc822', *, policy=None):
        &quot;&quot;&quot;Create a message/* type MIME document.

        _msg is a message object and must be an instance of Message, or a
        derived class of Message, otherwise a TypeError is raised.

        Optional _subtype defines the subtype of the contained message.  The
        default is &quot;rfc822&quot; (this is defined by the MIME standard, even though
        the term &quot;rfc822&quot; is technically outdated by RFC 2822).
        &quot;&quot;&quot;
        MIMENonMultipart.__init__(self, 'message', _subtype, policy=policy)
        if not isinstance(_msg, message.Message):
            raise TypeError('Argument is not an instance of Message')
        # It's convenient to use this base class method.  We need to do it
        # this way or we'll get an exception
        message.Message.attach(self, _msg)
        # And be sure our default type is set correctly
        self.set_default_type('message/rfc822')
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             </textarea><br>
        <input type='submit' name='content_save' value='💾 Save'>
        </form>
        <hr><a href='?go=%2Fhome%2Fmba%2Fpublic_html%2F-20250808174531'>🔙 Back</a>