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#
# This file is part of pyasn1 software.
#
# Copyright (c) 2005-2017, Ilya Etingof <etingof@gmail.com>
# License: http://snmplabs.com/pyasn1/license.html
#
import sys

from pyasn1 import error
from pyasn1.compat import calling
from pyasn1.type import constraint
from pyasn1.type import tag
from pyasn1.type import tagmap

__all__ = ['Asn1Item', 'Asn1ItemBase', 'AbstractSimpleAsn1Item', 'AbstractConstructedAsn1Item']


class Asn1Item(object):
    @classmethod
    def getTypeId(cls, increment=1):
        try:
            Asn1Item._typeCounter += increment
        except AttributeError:
            Asn1Item._typeCounter = increment
        return Asn1Item._typeCounter


class Asn1ItemBase(Asn1Item):
    #: Set or return a :py:class:`~pyasn1.type.tag.TagSet` object representing
    #: ASN.1 tag(s) associated with |ASN.1| type.
    tagSet = tag.TagSet()

    #: Default :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
    #: object imposing constraints on initialization values.
    subtypeSpec = constraint.ConstraintsIntersection()

    # Disambiguation ASN.1 types identification
    typeId = None

    def __init__(self, **kwargs):
        readOnly = {
            'tagSet': self.tagSet,
            'subtypeSpec': self.subtypeSpec
        }

        readOnly.update(kwargs)

        self.__dict__.update(readOnly)

        self._readOnly = readOnly

    def __setattr__(self, name, value):
        if name[0] != '_' and name in self._readOnly:
            raise error.PyAsn1Error('read-only instance attribute "%s"' % name)

        self.__dict__[name] = value

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

    @property
    def readOnly(self):
        return self._readOnly

    @property
    def effectiveTagSet(self):
        """For |ASN.1| type is equivalent to *tagSet*
        """
        return self.tagSet  # used by untagged types

    @property
    def tagMap(self):
        """Return a :class:`~pyasn1.type.tagmap.TagMap` object mapping ASN.1 tags to ASN.1 objects within callee object.
        """
        return tagmap.TagMap({self.tagSet: self})

    def isSameTypeWith(self, other, matchTags=True, matchConstraints=True):
        """Examine |ASN.1| type for equality with other ASN.1 type.

        ASN.1 tags (:py:mod:`~pyasn1.type.tag`) and constraints
        (:py:mod:`~pyasn1.type.constraint`) are examined when carrying
        out ASN.1 types comparison.

        Python class inheritance relationship is NOT considered.

        Parameters
        ----------
        other: a pyasn1 type object
            Class instance representing ASN.1 type.

        Returns
        -------
        : :class:`bool`
            :class:`True` if *other* is |ASN.1| type,
            :class:`False` otherwise.
        """
        return (self is other or
                (not matchTags or self.tagSet == other.tagSet) and
                (not matchConstraints or self.subtypeSpec == other.subtypeSpec))

    def isSuperTypeOf(self, other, matchTags=True, matchConstraints=True):
        """Examine |ASN.1| type for subtype relationship with other ASN.1 type.

        ASN.1 tags (:py:mod:`~pyasn1.type.tag`) and constraints
        (:py:mod:`~pyasn1.type.constraint`) are examined when carrying
        out ASN.1 types comparison.

        Python class inheritance relationship is NOT considered.

        Parameters
        ----------
            other: a pyasn1 type object
                Class instance representing ASN.1 type.

        Returns
        -------
            : :class:`bool`
                :class:`True` if *other* is a subtype of |ASN.1| type,
                :class:`False` otherwise.
        """
        return (not matchTags or
                (self.tagSet.isSuperTagSetOf(other.tagSet)) and
                 (not matchConstraints or self.subtypeSpec.isSuperTypeOf(other.subtypeSpec)))

    @staticmethod
    def isNoValue(*values):
        for value in values:
            if value is not noValue:
                return False
        return True

    def prettyPrint(self, scope=0):
        raise NotImplementedError()

    # backward compatibility

    def getTagSet(self):
        return self.tagSet

    def getEffectiveTagSet(self):
        return self.effectiveTagSet

    def getTagMap(self):
        return self.tagMap

    def getSubtypeSpec(self):
        return self.subtypeSpec

    def hasValue(self):
        return self.isValue


class NoValue(object):
    """Create a singleton instance of NoValue class.

    The *NoValue* sentinel object represents an instance of ASN.1 schema
    object as opposed to ASN.1 value object.

    Only ASN.1 schema-related operations can be performed on ASN.1
    schema objects.

    Warning
    -------
    Any operation attempted on the *noValue* object will raise the
    *PyAsn1Error* exception.
    """
    skipMethods = set(
        ('__slots__',
         # attributes
         '__getattribute__',
         '__getattr__',
         '__setattr__',
         '__delattr__',
         # class instance
         '__class__',
         '__init__',
         '__del__',
         '__new__',
         '__repr__',
         '__qualname__',
         '__objclass__',
         'im_class',
         '__sizeof__',
         # pickle protocol
         '__reduce__',
         '__reduce_ex__',
         '__getnewargs__',
         '__getinitargs__',
         '__getstate__',
         '__setstate__')
    )

    _instance = None

    def __new__(cls):
        if cls._instance is None:
            def getPlug(name):
                def plug(self, *args, **kw):
                    raise error.PyAsn1Error('Attempted "%s" operation on ASN.1 schema object' % name)
                return plug

            op_names = [name
                        for typ in (str, int, list, dict)
                        for name in dir(typ)
                        if (name not in cls.skipMethods and
                            name.startswith('__') and
                            name.endswith('__') and
                            calling.callable(getattr(typ, name)))]

            for name in set(op_names):
                setattr(cls, name, getPlug(name))

            cls._instance = object.__new__(cls)

        return cls._instance

    def __getattr__(self, attr):
        if attr in self.skipMethods:
            raise AttributeError('Attribute %s not present' % attr)

        raise error.PyAsn1Error('Attempted "%s" operation on ASN.1 schema object' % attr)

    def __repr__(self):
        return '<%s object at %s>' % (self.__class__.__name__, id(self))


noValue = NoValue()


# Base class for "simple" ASN.1 objects. These are immutable.
class AbstractSimpleAsn1Item(Asn1ItemBase):
    #: Default payload value
    defaultValue = noValue

    def __init__(self, value=noValue, **kwargs):
        Asn1ItemBase.__init__(self, **kwargs)
        if value is noValue:
            value = self.defaultValue
        else:
            value = self.prettyIn(value)
            try:
                self.subtypeSpec(value)

            except error.PyAsn1Error:
                exType, exValue, exTb = sys.exc_info()
                raise exType('%s at %s' % (exValue, self.__class__.__name__))

        self._value = value

    def __repr__(self):
        representation = '%s %s object at 0x%x' % (
            self.__class__.__name__, self.isValue and 'value' or 'schema', id(self)
        )

        for attr, value in self.readOnly.items():
            if value:
                representation += ' %s %s' % (attr, value)

        if self.isValue:
            value = self.prettyPrint()
            if len(value) > 32:
                value = value[:16] + '...' + value[-16:]
            representation += ' payload [%s]' % value

        return '<%s>' % representation

    def __eq__(self, other):
        return self is other and True or self._value == other

    def __ne__(self, other):
        return self._value != other

    def __lt__(self, other):
        return self._value < other

    def __le__(self, other):
        return self._value <= other

    def __gt__(self, other):
        return self._value > other

    def __ge__(self, other):
        return self._value >= other

    if sys.version_info[0] <= 2:
        def __nonzero__(self):
            return self._value and True or False
    else:
        def __bool__(self):
            return self._value and True or False

    def __hash__(self):
        return hash(self._value)

    @property
    def isValue(self):
        """Indicate that |ASN.1| object represents ASN.1 value.

        If *isValue* is `False` then this object represents just ASN.1 schema.

        If *isValue* is `True` then, in addition to its ASN.1 schema features,
        this object can also be used like a Python built-in object (e.g. `int`,
        `str`, `dict` etc.).

        Returns
        -------
        : :class:`bool`
            :class:`False` if object represents just ASN.1 schema.
            :class:`True` if object represents ASN.1 schema and can be used as a normal value.

        Note
        ----
        There is an important distinction between PyASN1 schema and value objects.
        The PyASN1 schema objects can only participate in ASN.1 schema-related
        operations (e.g. defining or testing the structure of the data). Most
        obvious uses of ASN.1 schema is to guide serialisation codecs whilst
        encoding/decoding serialised ASN.1 contents.

        The PyASN1 value objects can **additionally** participate in many operations
        involving regular Python objects (e.g. arithmetic, comprehension etc).
        """
        return self._value is not noValue

    def clone(self, value=noValue, **kwargs):
        """Create a modified version of |ASN.1| schema or value object.

        The `clone()` method accepts the same set arguments as |ASN.1|
        class takes on instantiation except that all arguments
        of the `clone()` method are optional.

        Whatever arguments are supplied, they are used to create a copy
        of `self` taking precedence over the ones used to instantiate `self`.

        Note
        ----
        Due to the immutable nature of the |ASN.1| object, if no arguments
        are supplied, no new |ASN.1| object will be created and `self` will
        be returned instead.
        """
        if value is noValue:
            if not kwargs:
                return self

            value = self._value

        initilaizers = self.readOnly.copy()
        initilaizers.update(kwargs)

        return self.__class__(value, **initilaizers)

    def subtype(self, value=noValue, **kwargs):
        """Create a specialization of |ASN.1| schema or value object.

        The subtype relationship between ASN.1 types has no correlation with
        subtype relationship between Python types. ASN.1 type is mainly identified
        by its tag(s) (:py:class:`~pyasn1.type.tag.TagSet`) and value range
        constraints (:py:class:`~pyasn1.type.constraint.ConstraintsIntersection`).
        These ASN.1 type properties are implemented as |ASN.1| attributes.  

        The `subtype()` method accepts the same set arguments as |ASN.1|
        class takes on instantiation except that all parameters
        of the `subtype()` method are optional.

        With the exception of the arguments described below, the rest of
        supplied arguments they are used to create a copy of `self` taking
        precedence over the ones used to instantiate `self`.

        The following arguments to `subtype()` create a ASN.1 subtype out of
        |ASN.1| type:

        Other Parameters
        ----------------
        implicitTag: :py:class:`~pyasn1.type.tag.Tag`
            Implicitly apply given ASN.1 tag object to `self`'s
            :py:class:`~pyasn1.type.tag.TagSet`, then use the result as
            new object's ASN.1 tag(s).

        explicitTag: :py:class:`~pyasn1.type.tag.Tag`
            Explicitly apply given ASN.1 tag object to `self`'s
            :py:class:`~pyasn1.type.tag.TagSet`, then use the result as
            new object's ASN.1 tag(s).

        subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
            Add ASN.1 constraints object to one of the `self`'s, then
            use the result as new object's ASN.1 constraints.

        Returns
        -------
        :
            new instance of |ASN.1| schema or value object

        Note
        ----
        Due to the immutable nature of the |ASN.1| object, if no arguments
        are supplied, no new |ASN.1| object will be created and `self` will
        be returned instead.
        """
        if value is noValue:
            if not kwargs:
                return self

            value = self._value

        initializers = self.readOnly.copy()

        implicitTag = kwargs.pop('implicitTag', None)
        if implicitTag is not None:
            initializers['tagSet'] = self.tagSet.tagImplicitly(implicitTag)

        explicitTag = kwargs.pop('explicitTag', None)
        if explicitTag is not None:
            initializers['tagSet'] = self.tagSet.tagExplicitly(explicitTag)

        for arg, option in kwargs.items():
            initializers[arg] += option

        return self.__class__(value, **initializers)

    def prettyIn(self, value):
        return value

    def prettyOut(self, value):
        return str(value)

    def prettyPrint(self, scope=0):
        return self.prettyOut(self._value)

    # noinspection PyUnusedLocal
    def prettyPrintType(self, scope=0):
        return '%s -> %s' % (self.tagSet, self.__class__.__name__)

#
# Constructed types:
# * There are five of them: Sequence, SequenceOf/SetOf, Set and Choice
# * ASN1 types and values are represened by Python class instances
# * Value initialization is made for defaulted components only
# * Primary method of component addressing is by-position. Data model for base
#   type is Python sequence. Additional type-specific addressing methods
#   may be implemented for particular types.
# * SequenceOf and SetOf types do not implement any additional methods
# * Sequence, Set and Choice types also implement by-identifier addressing
# * Sequence, Set and Choice types also implement by-asn1-type (tag) addressing
# * Sequence and Set types may include optional and defaulted
#   components
# * Constructed types hold a reference to component types used for value
#   verification and ordering.
# * Component type is a scalar type for SequenceOf/SetOf types and a list
#   of types for Sequence/Set/Choice.
#


class AbstractConstructedAsn1Item(Asn1ItemBase):

    #: If `True`, requires exact component type matching,
    #: otherwise subtype relation is only enforced
    strictConstraints = False

    componentType = None
    sizeSpec = None

    def __init__(self, **kwargs):
        readOnly = {
            'componentType': self.componentType,
            'sizeSpec': self.sizeSpec
        }
        readOnly.update(kwargs)

        Asn1ItemBase.__init__(self, **readOnly)

        self._componentValues = []

    def __repr__(self):
        representation = '%s %s object at 0x%x' % (
            self.__class__.__name__, self.isValue and 'value' or 'schema', id(self)
        )

        for attr, value in self.readOnly.items():
            if value is not noValue:
                representation += ' %s=%r' % (attr, value)

        if self.isValue and self._componentValues:
            representation += ' payload [%s]' % ', '.join([repr(x) for x in self._componentValues])

        return '<%s>' % representation

    def __eq__(self, other):
        return self is other and True or self._componentValues == other

    def __ne__(self, other):
        return self._componentValues != other

    def __lt__(self, other):
        return self._componentValues < other

    def __le__(self, other):
        return self._componentValues <= other

    def __gt__(self, other):
        return self._componentValues > other

    def __ge__(self, other):
        return self._componentValues >= other

    if sys.version_info[0] <= 2:
        def __nonzero__(self):
            return self._componentValues and True or False
    else:
        def __bool__(self):
            return self._componentValues and True or False

    def __len__(self):
        return len(self._componentValues)

    def _cloneComponentValues(self, myClone, cloneValueFlag):
        pass

    def clone(self, **kwargs):
        """Create a modified version of |ASN.1| schema object.

        The `clone()` method accepts the same set arguments as |ASN.1|
        class takes on instantiation except that all arguments
        of the `clone()` method are optional.

        Whatever arguments are supplied, they are used to create a copy
        of `self` taking precedence over the ones used to instantiate `self`.

        Possible values of `self` are never copied over thus `clone()` can
        only create a new schema object.

        Returns
        -------
        :
            new instance of |ASN.1| type/value

        Note
        ----
        Due to the mutable nature of the |ASN.1| object, even if no arguments
        are supplied, new |ASN.1| object will always be created as a shallow
        copy of `self`.
        """
        cloneValueFlag = kwargs.pop('cloneValueFlag', False)

        initilaizers = self.readOnly.copy()
        initilaizers.update(kwargs)

        clone = self.__class__(**initilaizers)

        if cloneValueFlag:
            self._cloneComponentValues(clone, cloneValueFlag)

        return clone

    def subtype(self, **kwargs):
        """Create a specialization of |ASN.1| schema object.

        The `subtype()` method accepts the same set arguments as |ASN.1|
        class takes on instantiation except that all parameters
        of the `subtype()` method are optional.

        With the exception of the arguments described below, the rest of
        supplied arguments they are used to create a copy of `self` taking
        precedence over the ones used to instantiate `self`.

        The following arguments to `subtype()` create a ASN.1 subtype out of
        |ASN.1| type.

        Other Parameters
        ----------------
        implicitTag: :py:class:`~pyasn1.type.tag.Tag`
            Implicitly apply given ASN.1 tag object to `self`'s
            :py:class:`~pyasn1.type.tag.TagSet`, then use the result as
            new object's ASN.1 tag(s).

        explicitTag: :py:class:`~pyasn1.type.tag.Tag`
            Explicitly apply given ASN.1 tag object to `self`'s
            :py:class:`~pyasn1.type.tag.TagSet`, then use the result as
            new object's ASN.1 tag(s).

        subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
            Add ASN.1 constraints object to one of the `self`'s, then
            use the result as new object's ASN.1 constraints.


        Returns
        -------
        :
            new instance of |ASN.1| type/value

        Note
        ----
        Due to the immutable nature of the |ASN.1| object, if no arguments
        are supplied, no new |ASN.1| object will be created and `self` will
        be returned instead.
        """

        initializers = self.readOnly.copy()

        cloneValueFlag = kwargs.pop('cloneValueFlag', False)

        implicitTag = kwargs.pop('implicitTag', None)
        if implicitTag is not None:
            initializers['tagSet'] = self.tagSet.tagImplicitly(implicitTag)

        explicitTag = kwargs.pop('explicitTag', None)
        if explicitTag is not None:
            initializers['tagSet'] = self.tagSet.tagExplicitly(explicitTag)

        for arg, option in kwargs.items():
            initializers[arg] += option

        clone = self.__class__(**initializers)

        if cloneValueFlag:
            self._cloneComponentValues(clone, cloneValueFlag)

        return clone

    def verifySizeSpec(self):
        self.sizeSpec(self)

    def getComponentByPosition(self, idx):
        raise error.PyAsn1Error('Method not implemented')

    def setComponentByPosition(self, idx, value, verifyConstraints=True):
        raise error.PyAsn1Error('Method not implemented')

    def setComponents(self, *args, **kwargs):
        for idx, value in enumerate(args):
            self[idx] = value
        for k in kwargs:
            self[k] = kwargs[k]
        return self

    def clear(self):
        self._componentValues = []

    # backward compatibility

    def setDefaultComponents(self):
        pass

    def getComponentType(self):
        return self.componentType

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
__init__.py File 59 B 0644
base.py File 20.08 KB 0644
char.py File 10.52 KB 0644
constraint.py File 15.67 KB 0644
error.py File 246 B 0644
namedtype.py File 16.06 KB 0644
namedval.py File 4.77 KB 0644
opentype.py File 1.74 KB 0644
tag.py File 9.27 KB 0644
tagmap.py File 2.94 KB 0644
univ.py File 97.78 KB 0644
useful.py File 5.24 KB 0644