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Current File : /opt/imunify360/venv/lib64/python3.11/site-packages/pyasn1/codec/cer/encoder.py
#
# This file is part of pyasn1 software.
#
# Copyright (c) 2005-2020, Ilya Etingof <[email protected]>
# License: https://pyasn1.readthedocs.io/en/latest/license.html
#
import warnings

from pyasn1 import error
from pyasn1.codec.ber import encoder
from pyasn1.type import univ
from pyasn1.type import useful

__all__ = ['Encoder', 'encode']


class BooleanEncoder(encoder.IntegerEncoder):
    def encodeValue(self, value, asn1Spec, encodeFun, **options):
        if value == 0:
            substrate = (0,)
        else:
            substrate = (255,)
        return substrate, False, False


class RealEncoder(encoder.RealEncoder):
    def _chooseEncBase(self, value):
        m, b, e = value
        return self._dropFloatingPoint(m, b, e)


# specialized GeneralStringEncoder here

class TimeEncoderMixIn(object):
    Z_CHAR = ord('Z')
    PLUS_CHAR = ord('+')
    MINUS_CHAR = ord('-')
    COMMA_CHAR = ord(',')
    DOT_CHAR = ord('.')
    ZERO_CHAR = ord('0')

    MIN_LENGTH = 12
    MAX_LENGTH = 19

    def encodeValue(self, value, asn1Spec, encodeFun, **options):
        # CER encoding constraints:
        # - minutes are mandatory, seconds are optional
        # - sub-seconds must NOT be zero / no meaningless zeros
        # - no hanging fraction dot
        # - time in UTC (Z)
        # - only dot is allowed for fractions

        if asn1Spec is not None:
            value = asn1Spec.clone(value)

        numbers = value.asNumbers()

        if self.PLUS_CHAR in numbers or self.MINUS_CHAR in numbers:
            raise error.PyAsn1Error('Must be UTC time: %r' % value)

        if numbers[-1] != self.Z_CHAR:
            raise error.PyAsn1Error('Missing "Z" time zone specifier: %r' % value)

        if self.COMMA_CHAR in numbers:
            raise error.PyAsn1Error('Comma in fractions disallowed: %r' % value)

        if self.DOT_CHAR in numbers:

            isModified = False

            numbers = list(numbers)

            searchIndex = min(numbers.index(self.DOT_CHAR) + 4, len(numbers) - 1)

            while numbers[searchIndex] != self.DOT_CHAR:
                if numbers[searchIndex] == self.ZERO_CHAR:
                    del numbers[searchIndex]
                    isModified = True

                searchIndex -= 1

            searchIndex += 1

            if searchIndex < len(numbers):
                if numbers[searchIndex] == self.Z_CHAR:
                    # drop hanging comma
                    del numbers[searchIndex - 1]
                    isModified = True

            if isModified:
                value = value.clone(numbers)

        if not self.MIN_LENGTH < len(numbers) < self.MAX_LENGTH:
            raise error.PyAsn1Error('Length constraint violated: %r' % value)

        options.update(maxChunkSize=1000)

        return encoder.OctetStringEncoder.encodeValue(
            self, value, asn1Spec, encodeFun, **options
        )


class GeneralizedTimeEncoder(TimeEncoderMixIn, encoder.OctetStringEncoder):
    MIN_LENGTH = 12
    MAX_LENGTH = 20


class UTCTimeEncoder(TimeEncoderMixIn, encoder.OctetStringEncoder):
    MIN_LENGTH = 10
    MAX_LENGTH = 14


class SetOfEncoder(encoder.SequenceOfEncoder):
    def encodeValue(self, value, asn1Spec, encodeFun, **options):
        chunks = self._encodeComponents(
            value, asn1Spec, encodeFun, **options)

        # sort by serialised and padded components
        if len(chunks) > 1:
            zero = b'\x00'
            maxLen = max(map(len, chunks))
            paddedChunks = [
                (x.ljust(maxLen, zero), x) for x in chunks
            ]
            paddedChunks.sort(key=lambda x: x[0])

            chunks = [x[1] for x in paddedChunks]

        return b''.join(chunks), True, True


class SequenceOfEncoder(encoder.SequenceOfEncoder):
    def encodeValue(self, value, asn1Spec, encodeFun, **options):

        if options.get('ifNotEmpty', False) and not len(value):
            return b'', True, True

        chunks = self._encodeComponents(
            value, asn1Spec, encodeFun, **options)

        return b''.join(chunks), True, True


class SetEncoder(encoder.SequenceEncoder):
    @staticmethod
    def _componentSortKey(componentAndType):
        """Sort SET components by tag

        Sort regardless of the Choice value (static sort)
        """
        component, asn1Spec = componentAndType

        if asn1Spec is None:
            asn1Spec = component

        if asn1Spec.typeId == univ.Choice.typeId and not asn1Spec.tagSet:
            if asn1Spec.tagSet:
                return asn1Spec.tagSet
            else:
                return asn1Spec.componentType.minTagSet
        else:
            return asn1Spec.tagSet

    def encodeValue(self, value, asn1Spec, encodeFun, **options):

        substrate = b''

        comps = []
        compsMap = {}

        if asn1Spec is None:
            # instance of ASN.1 schema
            inconsistency = value.isInconsistent
            if inconsistency:
                raise error.PyAsn1Error(
                    f"ASN.1 object {value.__class__.__name__} is inconsistent")

            namedTypes = value.componentType

            for idx, component in enumerate(value.values()):
                if namedTypes:
                    namedType = namedTypes[idx]

                    if namedType.isOptional and not component.isValue:
                            continue

                    if namedType.isDefaulted and component == namedType.asn1Object:
                            continue

                    compsMap[id(component)] = namedType

                else:
                    compsMap[id(component)] = None

                comps.append((component, asn1Spec))

        else:
            # bare Python value + ASN.1 schema
            for idx, namedType in enumerate(asn1Spec.componentType.namedTypes):

                try:
                    component = value[namedType.name]

                except KeyError:
                    raise error.PyAsn1Error('Component name "%s" not found in %r' % (namedType.name, value))

                if namedType.isOptional and namedType.name not in value:
                    continue

                if namedType.isDefaulted and component == namedType.asn1Object:
                    continue

                compsMap[id(component)] = namedType
                comps.append((component, asn1Spec[idx]))

        for comp, compType in sorted(comps, key=self._componentSortKey):
            namedType = compsMap[id(comp)]

            if namedType:
                options.update(ifNotEmpty=namedType.isOptional)

            chunk = encodeFun(comp, compType, **options)

            # wrap open type blob if needed
            if namedType and namedType.openType:
                wrapType = namedType.asn1Object
                if wrapType.tagSet and not wrapType.isSameTypeWith(comp):
                    chunk = encodeFun(chunk, wrapType, **options)

            substrate += chunk

        return substrate, True, True


class SequenceEncoder(encoder.SequenceEncoder):
    omitEmptyOptionals = True


TAG_MAP = encoder.TAG_MAP.copy()

TAG_MAP.update({
    univ.Boolean.tagSet: BooleanEncoder(),
    univ.Real.tagSet: RealEncoder(),
    useful.GeneralizedTime.tagSet: GeneralizedTimeEncoder(),
    useful.UTCTime.tagSet: UTCTimeEncoder(),
    # Sequence & Set have same tags as SequenceOf & SetOf
    univ.SetOf.tagSet: SetOfEncoder(),
    univ.Sequence.typeId: SequenceEncoder()
})

TYPE_MAP = encoder.TYPE_MAP.copy()

TYPE_MAP.update({
    univ.Boolean.typeId: BooleanEncoder(),
    univ.Real.typeId: RealEncoder(),
    useful.GeneralizedTime.typeId: GeneralizedTimeEncoder(),
    useful.UTCTime.typeId: UTCTimeEncoder(),
    # Sequence & Set have same tags as SequenceOf & SetOf
    univ.Set.typeId: SetEncoder(),
    univ.SetOf.typeId: SetOfEncoder(),
    univ.Sequence.typeId: SequenceEncoder(),
    univ.SequenceOf.typeId: SequenceOfEncoder()
})


class SingleItemEncoder(encoder.SingleItemEncoder):
    fixedDefLengthMode = False
    fixedChunkSize = 1000

    TAG_MAP = TAG_MAP
    TYPE_MAP = TYPE_MAP


class Encoder(encoder.Encoder):
    SINGLE_ITEM_ENCODER = SingleItemEncoder


#: Turns ASN.1 object into CER octet stream.
#:
#: Takes any ASN.1 object (e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative)
#: walks all its components recursively and produces a CER octet stream.
#:
#: Parameters
#: ----------
#: value: either a Python or pyasn1 object (e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative)
#:     A Python or pyasn1 object to encode. If Python object is given, `asnSpec`
#:     parameter is required to guide the encoding process.
#:
#: Keyword Args
#: ------------
#: asn1Spec:
#:     Optional ASN.1 schema or value object e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative
#:
#: Returns
#: -------
#: : :py:class:`bytes`
#:     Given ASN.1 object encoded into BER octet-stream
#:
#: Raises
#: ------
#: ~pyasn1.error.PyAsn1Error
#:     On encoding errors
#:
#: Examples
#: --------
#: Encode Python value into CER with ASN.1 schema
#:
#: .. code-block:: pycon
#:
#:    >>> seq = SequenceOf(componentType=Integer())
#:    >>> encode([1, 2, 3], asn1Spec=seq)
#:    b'0\x80\x02\x01\x01\x02\x01\x02\x02\x01\x03\x00\x00'
#:
#: Encode ASN.1 value object into CER
#:
#: .. code-block:: pycon
#:
#:    >>> seq = SequenceOf(componentType=Integer())
#:    >>> seq.extend([1, 2, 3])
#:    >>> encode(seq)
#:    b'0\x80\x02\x01\x01\x02\x01\x02\x02\x01\x03\x00\x00'
#:
encode = Encoder()

# EncoderFactory queries class instance and builds a map of tags -> encoders

def __getattr__(attr: str):
    if newAttr := {"tagMap": "TAG_MAP", "typeMap": "TYPE_MAP"}.get(attr):
        warnings.warn(f"{attr} is deprecated. Please use {newAttr} instead.", DeprecationWarning)
        return globals()[newAttr]
    raise AttributeError(attr)

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