Current File : //usr/lib/python3/dist-packages/pyasn1/type/univ.py
#
# This file is part of pyasn1 software.
#
# Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
# License: http://snmplabs.com/pyasn1/license.html
#
import math
import sys
from pyasn1 import error
from pyasn1.codec.ber import eoo
from pyasn1.compat import binary
from pyasn1.compat import integer
from pyasn1.compat import octets
from pyasn1.type import base
from pyasn1.type import constraint
from pyasn1.type import namedtype
from pyasn1.type import namedval
from pyasn1.type import tag
from pyasn1.type import tagmap
NoValue = base.NoValue
noValue = NoValue()
__all__ = ['Integer', 'Boolean', 'BitString', 'OctetString', 'Null',
'ObjectIdentifier', 'Real', 'Enumerated',
'SequenceOfAndSetOfBase', 'SequenceOf', 'SetOf',
'SequenceAndSetBase', 'Sequence', 'Set', 'Choice', 'Any',
'NoValue', 'noValue']
# "Simple" ASN.1 types (yet incomplete)
class Integer(base.SimpleAsn1Type):
"""Create |ASN.1| schema or value object.
|ASN.1| class is based on :class:`~pyasn1.type.base.SimpleAsn1Type`, its
objects are immutable and duck-type Python :class:`int` objects.
Keyword Args
------------
value: :class:`int`, :class:`str` or |ASN.1| object
Python :class:`int` or :class:`str` literal or |ASN.1| class
instance. If `value` is not given, schema object will be created.
tagSet: :py:class:`~pyasn1.type.tag.TagSet`
Object representing non-default ASN.1 tag(s)
subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
Object representing non-default ASN.1 subtype constraint(s). Constraints
verification for |ASN.1| type occurs automatically on object
instantiation.
namedValues: :py:class:`~pyasn1.type.namedval.NamedValues`
Object representing non-default symbolic aliases for numbers
Raises
------
~pyasn1.error.ValueConstraintError, ~pyasn1.error.PyAsn1Error
On constraint violation or bad initializer.
Examples
--------
.. code-block:: python
class ErrorCode(Integer):
'''
ASN.1 specification:
ErrorCode ::=
INTEGER { disk-full(1), no-disk(-1),
disk-not-formatted(2) }
error ErrorCode ::= disk-full
'''
namedValues = NamedValues(
('disk-full', 1), ('no-disk', -1),
('disk-not-formatted', 2)
)
error = ErrorCode('disk-full')
"""
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.initTagSet(
tag.Tag(tag.tagClassUniversal, tag.tagFormatSimple, 0x02)
)
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` object
#: imposing constraints on |ASN.1| type initialization values.
subtypeSpec = constraint.ConstraintsIntersection()
#: Default :py:class:`~pyasn1.type.namedval.NamedValues` object
#: representing symbolic aliases for numbers
namedValues = namedval.NamedValues()
# Optimization for faster codec lookup
typeId = base.SimpleAsn1Type.getTypeId()
def __init__(self, value=noValue, **kwargs):
if 'namedValues' not in kwargs:
kwargs['namedValues'] = self.namedValues
base.SimpleAsn1Type.__init__(self, value, **kwargs)
def __and__(self, value):
return self.clone(self._value & value)
def __rand__(self, value):
return self.clone(value & self._value)
def __or__(self, value):
return self.clone(self._value | value)
def __ror__(self, value):
return self.clone(value | self._value)
def __xor__(self, value):
return self.clone(self._value ^ value)
def __rxor__(self, value):
return self.clone(value ^ self._value)
def __lshift__(self, value):
return self.clone(self._value << value)
def __rshift__(self, value):
return self.clone(self._value >> value)
def __add__(self, value):
return self.clone(self._value + value)
def __radd__(self, value):
return self.clone(value + self._value)
def __sub__(self, value):
return self.clone(self._value - value)
def __rsub__(self, value):
return self.clone(value - self._value)
def __mul__(self, value):
return self.clone(self._value * value)
def __rmul__(self, value):
return self.clone(value * self._value)
def __mod__(self, value):
return self.clone(self._value % value)
def __rmod__(self, value):
return self.clone(value % self._value)
def __pow__(self, value, modulo=None):
return self.clone(pow(self._value, value, modulo))
def __rpow__(self, value):
return self.clone(pow(value, self._value))
def __floordiv__(self, value):
return self.clone(self._value // value)
def __rfloordiv__(self, value):
return self.clone(value // self._value)
if sys.version_info[0] <= 2:
def __div__(self, value):
if isinstance(value, float):
return Real(self._value / value)
else:
return self.clone(self._value / value)
def __rdiv__(self, value):
if isinstance(value, float):
return Real(value / self._value)
else:
return self.clone(value / self._value)
else:
def __truediv__(self, value):
return Real(self._value / value)
def __rtruediv__(self, value):
return Real(value / self._value)
def __divmod__(self, value):
return self.clone(divmod(self._value, value))
def __rdivmod__(self, value):
return self.clone(divmod(value, self._value))
__hash__ = base.SimpleAsn1Type.__hash__
def __int__(self):
return int(self._value)
if sys.version_info[0] <= 2:
def __long__(self):
return long(self._value)
def __float__(self):
return float(self._value)
def __abs__(self):
return self.clone(abs(self._value))
def __index__(self):
return int(self._value)
def __pos__(self):
return self.clone(+self._value)
def __neg__(self):
return self.clone(-self._value)
def __invert__(self):
return self.clone(~self._value)
def __round__(self, n=0):
r = round(self._value, n)
if n:
return self.clone(r)
else:
return r
def __floor__(self):
return math.floor(self._value)
def __ceil__(self):
return math.ceil(self._value)
if sys.version_info[0:2] > (2, 5):
def __trunc__(self):
return self.clone(math.trunc(self._value))
def __lt__(self, value):
return self._value < value
def __le__(self, value):
return self._value <= value
def __eq__(self, value):
return self._value == value
def __ne__(self, value):
return self._value != value
def __gt__(self, value):
return self._value > value
def __ge__(self, value):
return self._value >= value
def prettyIn(self, value):
try:
return int(value)
except ValueError:
try:
return self.namedValues[value]
except KeyError:
raise error.PyAsn1Error(
'Can\'t coerce %r into integer: %s' % (value, sys.exc_info()[1])
)
def prettyOut(self, value):
try:
return str(self.namedValues[value])
except KeyError:
return str(value)
# backward compatibility
def getNamedValues(self):
return self.namedValues
class Boolean(Integer):
"""Create |ASN.1| schema or value object.
|ASN.1| class is based on :class:`~pyasn1.type.base.SimpleAsn1Type`, its
objects are immutable and duck-type Python :class:`int` objects.
Keyword Args
------------
value: :class:`int`, :class:`str` or |ASN.1| object
Python :class:`int` or :class:`str` literal or |ASN.1| class
instance. If `value` is not given, schema object will be created.
tagSet: :py:class:`~pyasn1.type.tag.TagSet`
Object representing non-default ASN.1 tag(s)
subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
Object representing non-default ASN.1 subtype constraint(s).Constraints
verification for |ASN.1| type occurs automatically on object
instantiation.
namedValues: :py:class:`~pyasn1.type.namedval.NamedValues`
Object representing non-default symbolic aliases for numbers
Raises
------
~pyasn1.error.ValueConstraintError, ~pyasn1.error.PyAsn1Error
On constraint violation or bad initializer.
Examples
--------
.. code-block:: python
class RoundResult(Boolean):
'''
ASN.1 specification:
RoundResult ::= BOOLEAN
ok RoundResult ::= TRUE
ko RoundResult ::= FALSE
'''
ok = RoundResult(True)
ko = RoundResult(False)
"""
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.initTagSet(
tag.Tag(tag.tagClassUniversal, tag.tagFormatSimple, 0x01),
)
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` object
#: imposing constraints on |ASN.1| type initialization values.
subtypeSpec = Integer.subtypeSpec + constraint.SingleValueConstraint(0, 1)
#: Default :py:class:`~pyasn1.type.namedval.NamedValues` object
#: representing symbolic aliases for numbers
namedValues = namedval.NamedValues(('False', 0), ('True', 1))
# Optimization for faster codec lookup
typeId = Integer.getTypeId()
if sys.version_info[0] < 3:
SizedIntegerBase = long
else:
SizedIntegerBase = int
class SizedInteger(SizedIntegerBase):
bitLength = leadingZeroBits = None
def setBitLength(self, bitLength):
self.bitLength = bitLength
self.leadingZeroBits = max(bitLength - integer.bitLength(self), 0)
return self
def __len__(self):
if self.bitLength is None:
self.setBitLength(integer.bitLength(self))
return self.bitLength
class BitString(base.SimpleAsn1Type):
"""Create |ASN.1| schema or value object.
|ASN.1| class is based on :class:`~pyasn1.type.base.SimpleAsn1Type`, its
objects are immutable and duck-type both Python :class:`tuple` (as a tuple
of bits) and :class:`int` objects.
Keyword Args
------------
value: :class:`int`, :class:`str` or |ASN.1| object
Python :class:`int` or :class:`str` literal representing binary
or hexadecimal number or sequence of integer bits or |ASN.1| object.
If `value` is not given, schema object will be created.
tagSet: :py:class:`~pyasn1.type.tag.TagSet`
Object representing non-default ASN.1 tag(s)
subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
Object representing non-default ASN.1 subtype constraint(s). Constraints
verification for |ASN.1| type occurs automatically on object
instantiation.
namedValues: :py:class:`~pyasn1.type.namedval.NamedValues`
Object representing non-default symbolic aliases for numbers
binValue: :py:class:`str`
Binary string initializer to use instead of the *value*.
Example: '10110011'.
hexValue: :py:class:`str`
Hexadecimal string initializer to use instead of the *value*.
Example: 'DEADBEEF'.
Raises
------
~pyasn1.error.ValueConstraintError, ~pyasn1.error.PyAsn1Error
On constraint violation or bad initializer.
Examples
--------
.. code-block:: python
class Rights(BitString):
'''
ASN.1 specification:
Rights ::= BIT STRING { user-read(0), user-write(1),
group-read(2), group-write(3),
other-read(4), other-write(5) }
group1 Rights ::= { group-read, group-write }
group2 Rights ::= '0011'B
group3 Rights ::= '3'H
'''
namedValues = NamedValues(
('user-read', 0), ('user-write', 1),
('group-read', 2), ('group-write', 3),
('other-read', 4), ('other-write', 5)
)
group1 = Rights(('group-read', 'group-write'))
group2 = Rights('0011')
group3 = Rights(0x3)
"""
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.initTagSet(
tag.Tag(tag.tagClassUniversal, tag.tagFormatSimple, 0x03)
)
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` object
#: imposing constraints on |ASN.1| type initialization values.
subtypeSpec = constraint.ConstraintsIntersection()
#: Default :py:class:`~pyasn1.type.namedval.NamedValues` object
#: representing symbolic aliases for numbers
namedValues = namedval.NamedValues()
# Optimization for faster codec lookup
typeId = base.SimpleAsn1Type.getTypeId()
defaultBinValue = defaultHexValue = noValue
def __init__(self, value=noValue, **kwargs):
if value is noValue:
if kwargs:
try:
value = self.fromBinaryString(kwargs.pop('binValue'), internalFormat=True)
except KeyError:
pass
try:
value = self.fromHexString(kwargs.pop('hexValue'), internalFormat=True)
except KeyError:
pass
if value is noValue:
if self.defaultBinValue is not noValue:
value = self.fromBinaryString(self.defaultBinValue, internalFormat=True)
elif self.defaultHexValue is not noValue:
value = self.fromHexString(self.defaultHexValue, internalFormat=True)
if 'namedValues' not in kwargs:
kwargs['namedValues'] = self.namedValues
base.SimpleAsn1Type.__init__(self, value, **kwargs)
def __str__(self):
return self.asBinary()
def __eq__(self, other):
other = self.prettyIn(other)
return self is other or self._value == other and len(self._value) == len(other)
def __ne__(self, other):
other = self.prettyIn(other)
return self._value != other or len(self._value) != len(other)
def __lt__(self, other):
other = self.prettyIn(other)
return len(self._value) < len(other) or len(self._value) == len(other) and self._value < other
def __le__(self, other):
other = self.prettyIn(other)
return len(self._value) <= len(other) or len(self._value) == len(other) and self._value <= other
def __gt__(self, other):
other = self.prettyIn(other)
return len(self._value) > len(other) or len(self._value) == len(other) and self._value > other
def __ge__(self, other):
other = self.prettyIn(other)
return len(self._value) >= len(other) or len(self._value) == len(other) and self._value >= other
# Immutable sequence object protocol
def __len__(self):
return len(self._value)
def __getitem__(self, i):
if i.__class__ is slice:
return self.clone([self[x] for x in range(*i.indices(len(self)))])
else:
length = len(self._value) - 1
if i > length or i < 0:
raise IndexError('bit index out of range')
return (self._value >> (length - i)) & 1
def __iter__(self):
length = len(self._value)
while length:
length -= 1
yield (self._value >> length) & 1
def __reversed__(self):
return reversed(tuple(self))
# arithmetic operators
def __add__(self, value):
value = self.prettyIn(value)
return self.clone(SizedInteger(self._value << len(value) | value).setBitLength(len(self._value) + len(value)))
def __radd__(self, value):
value = self.prettyIn(value)
return self.clone(SizedInteger(value << len(self._value) | self._value).setBitLength(len(self._value) + len(value)))
def __mul__(self, value):
bitString = self._value
while value > 1:
bitString <<= len(self._value)
bitString |= self._value
value -= 1
return self.clone(bitString)
def __rmul__(self, value):
return self * value
def __lshift__(self, count):
return self.clone(SizedInteger(self._value << count).setBitLength(len(self._value) + count))
def __rshift__(self, count):
return self.clone(SizedInteger(self._value >> count).setBitLength(max(0, len(self._value) - count)))
def __int__(self):
return self._value
def __float__(self):
return float(self._value)
if sys.version_info[0] < 3:
def __long__(self):
return self._value
def asNumbers(self):
"""Get |ASN.1| value as a sequence of 8-bit integers.
If |ASN.1| object length is not a multiple of 8, result
will be left-padded with zeros.
"""
return tuple(octets.octs2ints(self.asOctets()))
def asOctets(self):
"""Get |ASN.1| value as a sequence of octets.
If |ASN.1| object length is not a multiple of 8, result
will be left-padded with zeros.
"""
return integer.to_bytes(self._value, length=len(self))
def asInteger(self):
"""Get |ASN.1| value as a single integer value.
"""
return self._value
def asBinary(self):
"""Get |ASN.1| value as a text string of bits.
"""
binString = binary.bin(self._value)[2:]
return '0' * (len(self._value) - len(binString)) + binString
@classmethod
def fromHexString(cls, value, internalFormat=False, prepend=None):
"""Create a |ASN.1| object initialized from the hex string.
Parameters
----------
value: :class:`str`
Text string like 'DEADBEEF'
"""
try:
value = SizedInteger(value, 16).setBitLength(len(value) * 4)
except ValueError:
raise error.PyAsn1Error('%s.fromHexString() error: %s' % (cls.__name__, sys.exc_info()[1]))
if prepend is not None:
value = SizedInteger(
(SizedInteger(prepend) << len(value)) | value
).setBitLength(len(prepend) + len(value))
if not internalFormat:
value = cls(value)
return value
@classmethod
def fromBinaryString(cls, value, internalFormat=False, prepend=None):
"""Create a |ASN.1| object initialized from a string of '0' and '1'.
Parameters
----------
value: :class:`str`
Text string like '1010111'
"""
try:
value = SizedInteger(value or '0', 2).setBitLength(len(value))
except ValueError:
raise error.PyAsn1Error('%s.fromBinaryString() error: %s' % (cls.__name__, sys.exc_info()[1]))
if prepend is not None:
value = SizedInteger(
(SizedInteger(prepend) << len(value)) | value
).setBitLength(len(prepend) + len(value))
if not internalFormat:
value = cls(value)
return value
@classmethod
def fromOctetString(cls, value, internalFormat=False, prepend=None, padding=0):
"""Create a |ASN.1| object initialized from a string.
Parameters
----------
value: :class:`str` (Py2) or :class:`bytes` (Py3)
Text string like '\\\\x01\\\\xff' (Py2) or b'\\\\x01\\\\xff' (Py3)
"""
value = SizedInteger(integer.from_bytes(value) >> padding).setBitLength(len(value) * 8 - padding)
if prepend is not None:
value = SizedInteger(
(SizedInteger(prepend) << len(value)) | value
).setBitLength(len(prepend) + len(value))
if not internalFormat:
value = cls(value)
return value
def prettyIn(self, value):
if isinstance(value, SizedInteger):
return value
elif octets.isStringType(value):
if not value:
return SizedInteger(0).setBitLength(0)
elif value[0] == '\'': # "'1011'B" -- ASN.1 schema representation (deprecated)
if value[-2:] == '\'B':
return self.fromBinaryString(value[1:-2], internalFormat=True)
elif value[-2:] == '\'H':
return self.fromHexString(value[1:-2], internalFormat=True)
else:
raise error.PyAsn1Error(
'Bad BIT STRING value notation %s' % (value,)
)
elif self.namedValues and not value.isdigit(): # named bits like 'Urgent, Active'
names = [x.strip() for x in value.split(',')]
try:
bitPositions = [self.namedValues[name] for name in names]
except KeyError:
raise error.PyAsn1Error('unknown bit name(s) in %r' % (names,))
rightmostPosition = max(bitPositions)
number = 0
for bitPosition in bitPositions:
number |= 1 << (rightmostPosition - bitPosition)
return SizedInteger(number).setBitLength(rightmostPosition + 1)
elif value.startswith('0x'):
return self.fromHexString(value[2:], internalFormat=True)
elif value.startswith('0b'):
return self.fromBinaryString(value[2:], internalFormat=True)
else: # assume plain binary string like '1011'
return self.fromBinaryString(value, internalFormat=True)
elif isinstance(value, (tuple, list)):
return self.fromBinaryString(''.join([b and '1' or '0' for b in value]), internalFormat=True)
elif isinstance(value, BitString):
return SizedInteger(value).setBitLength(len(value))
elif isinstance(value, intTypes):
return SizedInteger(value)
else:
raise error.PyAsn1Error(
'Bad BitString initializer type \'%s\'' % (value,)
)
try:
# noinspection PyStatementEffect
all
except NameError: # Python 2.4
# noinspection PyShadowingBuiltins
def all(iterable):
for element in iterable:
if not element:
return False
return True
class OctetString(base.SimpleAsn1Type):
"""Create |ASN.1| schema or value object.
|ASN.1| class is based on :class:`~pyasn1.type.base.SimpleAsn1Type`, its
objects are immutable and duck-type Python 2 :class:`str` or
Python 3 :class:`bytes`. When used in Unicode context, |ASN.1| type
assumes "|encoding|" serialisation.
Keyword Args
------------
value: :class:`unicode`, :class:`str`, :class:`bytes` or |ASN.1| object
class:`str` (Python 2) or :class:`bytes` (Python 3), alternatively
class:`unicode` object (Python 2) or :class:`str` (Python 3)
representing character string to be serialised into octets
(note `encoding` parameter) or |ASN.1| object.
If `value` is not given, schema object will be created.
tagSet: :py:class:`~pyasn1.type.tag.TagSet`
Object representing non-default ASN.1 tag(s)
subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
Object representing non-default ASN.1 subtype constraint(s). Constraints
verification for |ASN.1| type occurs automatically on object
instantiation.
encoding: :py:class:`str`
Unicode codec ID to encode/decode :class:`unicode` (Python 2) or
:class:`str` (Python 3) the payload when |ASN.1| object is used
in text string context.
binValue: :py:class:`str`
Binary string initializer to use instead of the *value*.
Example: '10110011'.
hexValue: :py:class:`str`
Hexadecimal string initializer to use instead of the *value*.
Example: 'DEADBEEF'.
Raises
------
~pyasn1.error.ValueConstraintError, ~pyasn1.error.PyAsn1Error
On constraint violation or bad initializer.
Examples
--------
.. code-block:: python
class Icon(OctetString):
'''
ASN.1 specification:
Icon ::= OCTET STRING
icon1 Icon ::= '001100010011001000110011'B
icon2 Icon ::= '313233'H
'''
icon1 = Icon.fromBinaryString('001100010011001000110011')
icon2 = Icon.fromHexString('313233')
"""
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.initTagSet(
tag.Tag(tag.tagClassUniversal, tag.tagFormatSimple, 0x04)
)
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` object
#: imposing constraints on |ASN.1| type initialization values.
subtypeSpec = constraint.ConstraintsIntersection()
# Optimization for faster codec lookup
typeId = base.SimpleAsn1Type.getTypeId()
defaultBinValue = defaultHexValue = noValue
encoding = 'iso-8859-1'
def __init__(self, value=noValue, **kwargs):
if kwargs:
if value is noValue:
try:
value = self.fromBinaryString(kwargs.pop('binValue'))
except KeyError:
pass
try:
value = self.fromHexString(kwargs.pop('hexValue'))
except KeyError:
pass
if value is noValue:
if self.defaultBinValue is not noValue:
value = self.fromBinaryString(self.defaultBinValue)
elif self.defaultHexValue is not noValue:
value = self.fromHexString(self.defaultHexValue)
if 'encoding' not in kwargs:
kwargs['encoding'] = self.encoding
base.SimpleAsn1Type.__init__(self, value, **kwargs)
if sys.version_info[0] <= 2:
def prettyIn(self, value):
if isinstance(value, str):
return value
elif isinstance(value, unicode):
try:
return value.encode(self.encoding)
except (LookupError, UnicodeEncodeError):
exc = sys.exc_info()[1]
raise error.PyAsn1UnicodeEncodeError(
"Can't encode string '%s' with codec "
"%s" % (value, self.encoding), exc
)
elif isinstance(value, (tuple, list)):
try:
return ''.join([chr(x) for x in value])
except ValueError:
raise error.PyAsn1Error(
"Bad %s initializer '%s'" % (self.__class__.__name__, value)
)
else:
return str(value)
def __str__(self):
return str(self._value)
def __unicode__(self):
try:
return self._value.decode(self.encoding)
except UnicodeDecodeError:
exc = sys.exc_info()[1]
raise error.PyAsn1UnicodeDecodeError(
"Can't decode string '%s' with codec "
"%s" % (self._value, self.encoding), exc
)
def asOctets(self):
return str(self._value)
def asNumbers(self):
return tuple([ord(x) for x in self._value])
else:
def prettyIn(self, value):
if isinstance(value, bytes):
return value
elif isinstance(value, str):
try:
return value.encode(self.encoding)
except UnicodeEncodeError:
exc = sys.exc_info()[1]
raise error.PyAsn1UnicodeEncodeError(
"Can't encode string '%s' with '%s' "
"codec" % (value, self.encoding), exc
)
elif isinstance(value, OctetString): # a shortcut, bytes() would work the same way
return value.asOctets()
elif isinstance(value, base.SimpleAsn1Type): # this mostly targets Integer objects
return self.prettyIn(str(value))
elif isinstance(value, (tuple, list)):
return self.prettyIn(bytes(value))
else:
return bytes(value)
def __str__(self):
try:
return self._value.decode(self.encoding)
except UnicodeDecodeError:
exc = sys.exc_info()[1]
raise error.PyAsn1UnicodeDecodeError(
"Can't decode string '%s' with '%s' codec at "
"'%s'" % (self._value, self.encoding,
self.__class__.__name__), exc
)
def __bytes__(self):
return bytes(self._value)
def asOctets(self):
return bytes(self._value)
def asNumbers(self):
return tuple(self._value)
#
# Normally, `.prettyPrint()` is called from `__str__()`. Historically,
# OctetString.prettyPrint() used to return hexified payload
# representation in cases when non-printable content is present. At the
# same time `str()` used to produce either octet-stream (Py2) or
# text (Py3) representations.
#
# Therefore `OctetString.__str__()` -> `.prettyPrint()` call chain is
# reversed to preserve the original behaviour.
#
# Eventually we should deprecate `.prettyPrint()` / `.prettyOut()` harness
# and end up with just `__str__()` producing hexified representation while
# both text and octet-stream representation should only be requested via
# the `.asOctets()` method.
#
# Note: ASN.1 OCTET STRING is never mean to contain text!
#
def prettyOut(self, value):
return value
def prettyPrint(self, scope=0):
# first see if subclass has its own .prettyOut()
value = self.prettyOut(self._value)
if value is not self._value:
return value
numbers = self.asNumbers()
for x in numbers:
# hexify if needed
if x < 32 or x > 126:
return '0x' + ''.join(('%.2x' % x for x in numbers))
else:
# this prevents infinite recursion
return OctetString.__str__(self)
@staticmethod
def fromBinaryString(value):
"""Create a |ASN.1| object initialized from a string of '0' and '1'.
Parameters
----------
value: :class:`str`
Text string like '1010111'
"""
bitNo = 8
byte = 0
r = []
for v in value:
if bitNo:
bitNo -= 1
else:
bitNo = 7
r.append(byte)
byte = 0
if v in ('0', '1'):
v = int(v)
else:
raise error.PyAsn1Error(
'Non-binary OCTET STRING initializer %s' % (v,)
)
byte |= v << bitNo
r.append(byte)
return octets.ints2octs(r)
@staticmethod
def fromHexString(value):
"""Create a |ASN.1| object initialized from the hex string.
Parameters
----------
value: :class:`str`
Text string like 'DEADBEEF'
"""
r = []
p = []
for v in value:
if p:
r.append(int(p + v, 16))
p = None
else:
p = v
if p:
r.append(int(p + '0', 16))
return octets.ints2octs(r)
# Immutable sequence object protocol
def __len__(self):
return len(self._value)
def __getitem__(self, i):
if i.__class__ is slice:
return self.clone(self._value[i])
else:
return self._value[i]
def __iter__(self):
return iter(self._value)
def __contains__(self, value):
return value in self._value
def __add__(self, value):
return self.clone(self._value + self.prettyIn(value))
def __radd__(self, value):
return self.clone(self.prettyIn(value) + self._value)
def __mul__(self, value):
return self.clone(self._value * value)
def __rmul__(self, value):
return self * value
def __int__(self):
return int(self._value)
def __float__(self):
return float(self._value)
def __reversed__(self):
return reversed(self._value)
class Null(OctetString):
"""Create |ASN.1| schema or value object.
|ASN.1| class is based on :class:`~pyasn1.type.base.SimpleAsn1Type`, its
objects are immutable and duck-type Python :class:`str` objects
(always empty).
Keyword Args
------------
value: :class:`str` or |ASN.1| object
Python empty :class:`str` literal or any object that evaluates to :obj:`False`
If `value` is not given, schema object will be created.
tagSet: :py:class:`~pyasn1.type.tag.TagSet`
Object representing non-default ASN.1 tag(s)
Raises
------
~pyasn1.error.ValueConstraintError, ~pyasn1.error.PyAsn1Error
On constraint violation or bad initializer.
Examples
--------
.. code-block:: python
class Ack(Null):
'''
ASN.1 specification:
Ack ::= NULL
'''
ack = Ack('')
"""
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.initTagSet(
tag.Tag(tag.tagClassUniversal, tag.tagFormatSimple, 0x05)
)
subtypeSpec = OctetString.subtypeSpec + constraint.SingleValueConstraint(octets.str2octs(''))
# Optimization for faster codec lookup
typeId = OctetString.getTypeId()
def prettyIn(self, value):
if value:
return value
return octets.str2octs('')
if sys.version_info[0] <= 2:
intTypes = (int, long)
else:
intTypes = (int,)
numericTypes = intTypes + (float,)
class ObjectIdentifier(base.SimpleAsn1Type):
"""Create |ASN.1| schema or value object.
|ASN.1| class is based on :class:`~pyasn1.type.base.SimpleAsn1Type`, its
objects are immutable and duck-type Python :class:`tuple` objects
(tuple of non-negative integers).
Keyword Args
------------
value: :class:`tuple`, :class:`str` or |ASN.1| object
Python sequence of :class:`int` or :class:`str` literal or |ASN.1| object.
If `value` is not given, schema object will be created.
tagSet: :py:class:`~pyasn1.type.tag.TagSet`
Object representing non-default ASN.1 tag(s)
subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
Object representing non-default ASN.1 subtype constraint(s). Constraints
verification for |ASN.1| type occurs automatically on object
instantiation.
Raises
------
~pyasn1.error.ValueConstraintError, ~pyasn1.error.PyAsn1Error
On constraint violation or bad initializer.
Examples
--------
.. code-block:: python
class ID(ObjectIdentifier):
'''
ASN.1 specification:
ID ::= OBJECT IDENTIFIER
id-edims ID ::= { joint-iso-itu-t mhs-motif(6) edims(7) }
id-bp ID ::= { id-edims 11 }
'''
id_edims = ID('2.6.7')
id_bp = id_edims + (11,)
"""
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.initTagSet(
tag.Tag(tag.tagClassUniversal, tag.tagFormatSimple, 0x06)
)
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` object
#: imposing constraints on |ASN.1| type initialization values.
subtypeSpec = constraint.ConstraintsIntersection()
# Optimization for faster codec lookup
typeId = base.SimpleAsn1Type.getTypeId()
def __add__(self, other):
return self.clone(self._value + other)
def __radd__(self, other):
return self.clone(other + self._value)
def asTuple(self):
return self._value
# Sequence object protocol
def __len__(self):
return len(self._value)
def __getitem__(self, i):
if i.__class__ is slice:
return self.clone(self._value[i])
else:
return self._value[i]
def __iter__(self):
return iter(self._value)
def __contains__(self, value):
return value in self._value
def index(self, suboid):
return self._value.index(suboid)
def isPrefixOf(self, other):
"""Indicate if this |ASN.1| object is a prefix of other |ASN.1| object.
Parameters
----------
other: |ASN.1| object
|ASN.1| object
Returns
-------
: :class:`bool`
:obj:`True` if this |ASN.1| object is a parent (e.g. prefix) of the other |ASN.1| object
or :obj:`False` otherwise.
"""
l = len(self)
if l <= len(other):
if self._value[:l] == other[:l]:
return True
return False
def prettyIn(self, value):
if isinstance(value, ObjectIdentifier):
return tuple(value)
elif octets.isStringType(value):
if '-' in value:
raise error.PyAsn1Error(
'Malformed Object ID %s at %s: %s' % (value, self.__class__.__name__, sys.exc_info()[1])
)
try:
return tuple([int(subOid) for subOid in value.split('.') if subOid])
except ValueError:
raise error.PyAsn1Error(
'Malformed Object ID %s at %s: %s' % (value, self.__class__.__name__, sys.exc_info()[1])
)
try:
tupleOfInts = tuple([int(subOid) for subOid in value if subOid >= 0])
except (ValueError, TypeError):
raise error.PyAsn1Error(
'Malformed Object ID %s at %s: %s' % (value, self.__class__.__name__, sys.exc_info()[1])
)
if len(tupleOfInts) == len(value):
return tupleOfInts
raise error.PyAsn1Error('Malformed Object ID %s at %s' % (value, self.__class__.__name__))
def prettyOut(self, value):
return '.'.join([str(x) for x in value])
class Real(base.SimpleAsn1Type):
"""Create |ASN.1| schema or value object.
|ASN.1| class is based on :class:`~pyasn1.type.base.SimpleAsn1Type`, its
objects are immutable and duck-type Python :class:`float` objects.
Additionally, |ASN.1| objects behave like a :class:`tuple` in which case its
elements are mantissa, base and exponent.
Keyword Args
------------
value: :class:`tuple`, :class:`float` or |ASN.1| object
Python sequence of :class:`int` (representing mantissa, base and
exponent) or :class:`float` instance or |ASN.1| object.
If `value` is not given, schema object will be created.
tagSet: :py:class:`~pyasn1.type.tag.TagSet`
Object representing non-default ASN.1 tag(s)
subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
Object representing non-default ASN.1 subtype constraint(s). Constraints
verification for |ASN.1| type occurs automatically on object
instantiation.
Raises
------
~pyasn1.error.ValueConstraintError, ~pyasn1.error.PyAsn1Error
On constraint violation or bad initializer.
Examples
--------
.. code-block:: python
class Pi(Real):
'''
ASN.1 specification:
Pi ::= REAL
pi Pi ::= { mantissa 314159, base 10, exponent -5 }
'''
pi = Pi((314159, 10, -5))
"""
binEncBase = None # binEncBase = 16 is recommended for large numbers
try:
_plusInf = float('inf')
_minusInf = float('-inf')
_inf = _plusInf, _minusInf
except ValueError:
# Infinity support is platform and Python dependent
_plusInf = _minusInf = None
_inf = ()
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.initTagSet(
tag.Tag(tag.tagClassUniversal, tag.tagFormatSimple, 0x09)
)
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` object
#: imposing constraints on |ASN.1| type initialization values.
subtypeSpec = constraint.ConstraintsIntersection()
# Optimization for faster codec lookup
typeId = base.SimpleAsn1Type.getTypeId()
@staticmethod
def __normalizeBase10(value):
m, b, e = value
while m and m % 10 == 0:
m /= 10
e += 1
return m, b, e
def prettyIn(self, value):
if isinstance(value, tuple) and len(value) == 3:
if (not isinstance(value[0], numericTypes) or
not isinstance(value[1], intTypes) or
not isinstance(value[2], intTypes)):
raise error.PyAsn1Error('Lame Real value syntax: %s' % (value,))
if (isinstance(value[0], float) and
self._inf and value[0] in self._inf):
return value[0]
if value[1] not in (2, 10):
raise error.PyAsn1Error(
'Prohibited base for Real value: %s' % (value[1],)
)
if value[1] == 10:
value = self.__normalizeBase10(value)
return value
elif isinstance(value, intTypes):
return self.__normalizeBase10((value, 10, 0))
elif isinstance(value, float) or octets.isStringType(value):
if octets.isStringType(value):
try:
value = float(value)
except ValueError:
raise error.PyAsn1Error(
'Bad real value syntax: %s' % (value,)
)
if self._inf and value in self._inf:
return value
else:
e = 0
while int(value) != value:
value *= 10
e -= 1
return self.__normalizeBase10((int(value), 10, e))
elif isinstance(value, Real):
return tuple(value)
raise error.PyAsn1Error(
'Bad real value syntax: %s' % (value,)
)
def prettyPrint(self, scope=0):
try:
return self.prettyOut(float(self))
except OverflowError:
return '<overflow>'
@property
def isPlusInf(self):
"""Indicate PLUS-INFINITY object value
Returns
-------
: :class:`bool`
:obj:`True` if calling object represents plus infinity
or :obj:`False` otherwise.
"""
return self._value == self._plusInf
@property
def isMinusInf(self):
"""Indicate MINUS-INFINITY object value
Returns
-------
: :class:`bool`
:obj:`True` if calling object represents minus infinity
or :obj:`False` otherwise.
"""
return self._value == self._minusInf
@property
def isInf(self):
return self._value in self._inf
def __add__(self, value):
return self.clone(float(self) + value)
def __radd__(self, value):
return self + value
def __mul__(self, value):
return self.clone(float(self) * value)
def __rmul__(self, value):
return self * value
def __sub__(self, value):
return self.clone(float(self) - value)
def __rsub__(self, value):
return self.clone(value - float(self))
def __mod__(self, value):
return self.clone(float(self) % value)
def __rmod__(self, value):
return self.clone(value % float(self))
def __pow__(self, value, modulo=None):
return self.clone(pow(float(self), value, modulo))
def __rpow__(self, value):
return self.clone(pow(value, float(self)))
if sys.version_info[0] <= 2:
def __div__(self, value):
return self.clone(float(self) / value)
def __rdiv__(self, value):
return self.clone(value / float(self))
else:
def __truediv__(self, value):
return self.clone(float(self) / value)
def __rtruediv__(self, value):
return self.clone(value / float(self))
def __divmod__(self, value):
return self.clone(float(self) // value)
def __rdivmod__(self, value):
return self.clone(value // float(self))
def __int__(self):
return int(float(self))
if sys.version_info[0] <= 2:
def __long__(self):
return long(float(self))
def __float__(self):
if self._value in self._inf:
return self._value
else:
return float(
self._value[0] * pow(self._value[1], self._value[2])
)
def __abs__(self):
return self.clone(abs(float(self)))
def __pos__(self):
return self.clone(+float(self))
def __neg__(self):
return self.clone(-float(self))
def __round__(self, n=0):
r = round(float(self), n)
if n:
return self.clone(r)
else:
return r
def __floor__(self):
return self.clone(math.floor(float(self)))
def __ceil__(self):
return self.clone(math.ceil(float(self)))
if sys.version_info[0:2] > (2, 5):
def __trunc__(self):
return self.clone(math.trunc(float(self)))
def __lt__(self, value):
return float(self) < value
def __le__(self, value):
return float(self) <= value
def __eq__(self, value):
return float(self) == value
def __ne__(self, value):
return float(self) != value
def __gt__(self, value):
return float(self) > value
def __ge__(self, value):
return float(self) >= value
if sys.version_info[0] <= 2:
def __nonzero__(self):
return bool(float(self))
else:
def __bool__(self):
return bool(float(self))
__hash__ = base.SimpleAsn1Type.__hash__
def __getitem__(self, idx):
if self._value in self._inf:
raise error.PyAsn1Error('Invalid infinite value operation')
else:
return self._value[idx]
# compatibility stubs
def isPlusInfinity(self):
return self.isPlusInf
def isMinusInfinity(self):
return self.isMinusInf
def isInfinity(self):
return self.isInf
class Enumerated(Integer):
"""Create |ASN.1| schema or value object.
|ASN.1| class is based on :class:`~pyasn1.type.base.SimpleAsn1Type`, its
objects are immutable and duck-type Python :class:`int` objects.
Keyword Args
------------
value: :class:`int`, :class:`str` or |ASN.1| object
Python :class:`int` or :class:`str` literal or |ASN.1| object.
If `value` is not given, schema object will be created.
tagSet: :py:class:`~pyasn1.type.tag.TagSet`
Object representing non-default ASN.1 tag(s)
subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
Object representing non-default ASN.1 subtype constraint(s). Constraints
verification for |ASN.1| type occurs automatically on object
instantiation.
namedValues: :py:class:`~pyasn1.type.namedval.NamedValues`
Object representing non-default symbolic aliases for numbers
Raises
------
~pyasn1.error.ValueConstraintError, ~pyasn1.error.PyAsn1Error
On constraint violation or bad initializer.
Examples
--------
.. code-block:: python
class RadioButton(Enumerated):
'''
ASN.1 specification:
RadioButton ::= ENUMERATED { button1(0), button2(1),
button3(2) }
selected-by-default RadioButton ::= button1
'''
namedValues = NamedValues(
('button1', 0), ('button2', 1),
('button3', 2)
)
selected_by_default = RadioButton('button1')
"""
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.initTagSet(
tag.Tag(tag.tagClassUniversal, tag.tagFormatSimple, 0x0A)
)
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` object
#: imposing constraints on |ASN.1| type initialization values.
subtypeSpec = constraint.ConstraintsIntersection()
# Optimization for faster codec lookup
typeId = Integer.getTypeId()
#: Default :py:class:`~pyasn1.type.namedval.NamedValues` object
#: representing symbolic aliases for numbers
namedValues = namedval.NamedValues()
# "Structured" ASN.1 types
class SequenceOfAndSetOfBase(base.ConstructedAsn1Type):
"""Create |ASN.1| schema or value object.
|ASN.1| class is based on :class:`~pyasn1.type.base.ConstructedAsn1Type`,
its objects are mutable and duck-type Python :class:`list` objects.
Keyword Args
------------
componentType : :py:class:`~pyasn1.type.base.PyAsn1Item` derivative
A pyasn1 object representing ASN.1 type allowed within |ASN.1| type
tagSet: :py:class:`~pyasn1.type.tag.TagSet`
Object representing non-default ASN.1 tag(s)
subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
Object representing non-default ASN.1 subtype constraint(s). Constraints
verification for |ASN.1| type can only occur on explicit
`.isInconsistent` call.
Examples
--------
.. code-block:: python
class LotteryDraw(SequenceOf): # SetOf is similar
'''
ASN.1 specification:
LotteryDraw ::= SEQUENCE OF INTEGER
'''
componentType = Integer()
lotteryDraw = LotteryDraw()
lotteryDraw.extend([123, 456, 789])
"""
def __init__(self, *args, **kwargs):
# support positional params for backward compatibility
if args:
for key, value in zip(('componentType', 'tagSet',
'subtypeSpec'), args):
if key in kwargs:
raise error.PyAsn1Error('Conflicting positional and keyword params!')
kwargs['componentType'] = value
self._componentValues = noValue
base.ConstructedAsn1Type.__init__(self, **kwargs)
# Python list protocol
def __getitem__(self, idx):
try:
return self.getComponentByPosition(idx)
except error.PyAsn1Error:
raise IndexError(sys.exc_info()[1])
def __setitem__(self, idx, value):
try:
self.setComponentByPosition(idx, value)
except error.PyAsn1Error:
raise IndexError(sys.exc_info()[1])
def append(self, value):
if self._componentValues is noValue:
pos = 0
else:
pos = len(self._componentValues)
self[pos] = value
def count(self, value):
return list(self._componentValues.values()).count(value)
def extend(self, values):
for value in values:
self.append(value)
if self._componentValues is noValue:
self._componentValues = {}
def index(self, value, start=0, stop=None):
if stop is None:
stop = len(self)
indices, values = zip(*self._componentValues.items())
# TODO: remove when Py2.5 support is gone
values = list(values)
try:
return indices[values.index(value, start, stop)]
except error.PyAsn1Error:
raise ValueError(sys.exc_info()[1])
def reverse(self):
self._componentValues.reverse()
def sort(self, key=None, reverse=False):
self._componentValues = dict(
enumerate(sorted(self._componentValues.values(),
key=key, reverse=reverse)))
def __len__(self):
if self._componentValues is noValue or not self._componentValues:
return 0
return max(self._componentValues) + 1
def __iter__(self):
for idx in range(0, len(self)):
yield self.getComponentByPosition(idx)
def _cloneComponentValues(self, myClone, cloneValueFlag):
for idx, componentValue in self._componentValues.items():
if componentValue is not noValue:
if isinstance(componentValue, base.ConstructedAsn1Type):
myClone.setComponentByPosition(
idx, componentValue.clone(cloneValueFlag=cloneValueFlag)
)
else:
myClone.setComponentByPosition(idx, componentValue.clone())
def getComponentByPosition(self, idx, default=noValue, instantiate=True):
"""Return |ASN.1| type component value by position.
Equivalent to Python sequence subscription operation (e.g. `[]`).
Parameters
----------
idx : :class:`int`
Component index (zero-based). Must either refer to an existing
component or to N+1 component (if *componentType* is set). In the latter
case a new component type gets instantiated and appended to the |ASN.1|
sequence.
Keyword Args
------------
default: :class:`object`
If set and requested component is a schema object, return the `default`
object instead of the requested component.
instantiate: :class:`bool`
If :obj:`True` (default), inner component will be automatically instantiated.
If :obj:`False` either existing component or the :class:`NoValue` object will be
returned.
Returns
-------
: :py:class:`~pyasn1.type.base.PyAsn1Item`
Instantiate |ASN.1| component type or return existing component value
Examples
--------
.. code-block:: python
# can also be SetOf
class MySequenceOf(SequenceOf):
componentType = OctetString()
s = MySequenceOf()
# returns component #0 with `.isValue` property False
s.getComponentByPosition(0)
# returns None
s.getComponentByPosition(0, default=None)
s.clear()
# returns noValue
s.getComponentByPosition(0, instantiate=False)
# sets component #0 to OctetString() ASN.1 schema
# object and returns it
s.getComponentByPosition(0, instantiate=True)
# sets component #0 to ASN.1 value object
s.setComponentByPosition(0, 'ABCD')
# returns OctetString('ABCD') value object
s.getComponentByPosition(0, instantiate=False)
s.clear()
# returns noValue
s.getComponentByPosition(0, instantiate=False)
"""
if isinstance(idx, slice):
indices = tuple(range(len(self)))
return [self.getComponentByPosition(subidx, default, instantiate)
for subidx in indices[idx]]
if idx < 0:
idx = len(self) + idx
if idx < 0:
raise error.PyAsn1Error(
'SequenceOf/SetOf index is out of range')
try:
componentValue = self._componentValues[idx]
except (KeyError, error.PyAsn1Error):
if not instantiate:
return default
self.setComponentByPosition(idx)
componentValue = self._componentValues[idx]
if default is noValue or componentValue.isValue:
return componentValue
else:
return default
def setComponentByPosition(self, idx, value=noValue,
verifyConstraints=True,
matchTags=True,
matchConstraints=True):
"""Assign |ASN.1| type component by position.
Equivalent to Python sequence item assignment operation (e.g. `[]`)
or list.append() (when idx == len(self)).
Parameters
----------
idx: :class:`int`
Component index (zero-based). Must either refer to existing
component or to N+1 component. In the latter case a new component
type gets instantiated (if *componentType* is set, or given ASN.1
object is taken otherwise) and appended to the |ASN.1| sequence.
Keyword Args
------------
value: :class:`object` or :py:class:`~pyasn1.type.base.PyAsn1Item` derivative
A Python value to initialize |ASN.1| component with (if *componentType* is set)
or ASN.1 value object to assign to |ASN.1| component.
If `value` is not given, schema object will be set as a component.
verifyConstraints: :class:`bool`
If :obj:`False`, skip constraints validation
matchTags: :class:`bool`
If :obj:`False`, skip component tags matching
matchConstraints: :class:`bool`
If :obj:`False`, skip component constraints matching
Returns
-------
self
Raises
------
~pyasn1.error.ValueConstraintError, ~pyasn1.error.PyAsn1Error
On constraint violation or bad initializer
IndexError
When idx > len(self)
"""
if isinstance(idx, slice):
indices = tuple(range(len(self)))
startIdx = indices and indices[idx][0] or 0
for subIdx, subValue in enumerate(value):
self.setComponentByPosition(
startIdx + subIdx, subValue, verifyConstraints,
matchTags, matchConstraints)
return self
if idx < 0:
idx = len(self) + idx
if idx < 0:
raise error.PyAsn1Error(
'SequenceOf/SetOf index is out of range')
componentType = self.componentType
if self._componentValues is noValue:
componentValues = {}
else:
componentValues = self._componentValues
currentValue = componentValues.get(idx, noValue)
if value is noValue:
if componentType is not None:
value = componentType.clone()
elif currentValue is noValue:
raise error.PyAsn1Error('Component type not defined')
elif not isinstance(value, base.Asn1Item):
if (componentType is not None and
isinstance(componentType, base.SimpleAsn1Type)):
value = componentType.clone(value=value)
elif (currentValue is not noValue and
isinstance(currentValue, base.SimpleAsn1Type)):
value = currentValue.clone(value=value)
else:
raise error.PyAsn1Error(
'Non-ASN.1 value %r and undefined component'
' type at %r' % (value, self))
elif componentType is not None and (matchTags or matchConstraints):
subtypeChecker = (
self.strictConstraints and
componentType.isSameTypeWith or
componentType.isSuperTypeOf)
if not subtypeChecker(value, verifyConstraints and matchTags,
verifyConstraints and matchConstraints):
# TODO: we should wrap componentType with UnnamedType to carry
# additional properties associated with componentType
if componentType.typeId != Any.typeId:
raise error.PyAsn1Error(
'Component value is tag-incompatible: %r vs '
'%r' % (value, componentType))
componentValues[idx] = value
self._componentValues = componentValues
return self
@property
def componentTagMap(self):
if self.componentType is not None:
return self.componentType.tagMap
@property
def components(self):
return [self._componentValues[idx]
for idx in sorted(self._componentValues)]
def clear(self):
"""Remove all components and become an empty |ASN.1| value object.
Has the same effect on |ASN.1| object as it does on :class:`list`
built-in.
"""
self._componentValues = {}
return self
def reset(self):
"""Remove all components and become a |ASN.1| schema object.
See :meth:`isValue` property for more information on the
distinction between value and schema objects.
"""
self._componentValues = noValue
return self
def prettyPrint(self, scope=0):
scope += 1
representation = self.__class__.__name__ + ':\n'
if not self.isValue:
return representation
for idx, componentValue in enumerate(self):
representation += ' ' * scope
if (componentValue is noValue and
self.componentType is not None):
representation += '<empty>'
else:
representation += componentValue.prettyPrint(scope)
return representation
def prettyPrintType(self, scope=0):
scope += 1
representation = '%s -> %s {\n' % (self.tagSet, self.__class__.__name__)
if self.componentType is not None:
representation += ' ' * scope
representation += self.componentType.prettyPrintType(scope)
return representation + '\n' + ' ' * (scope - 1) + '}'
@property
def isValue(self):
"""Indicate that |ASN.1| object represents ASN.1 value.
If *isValue* is :obj:`False` then this object represents just ASN.1 schema.
If *isValue* is :obj:`True` then, in addition to its ASN.1 schema features,
this object can also be used like a Python built-in object
(e.g. :class:`int`, :class:`str`, :class:`dict` etc.).
Returns
-------
: :class:`bool`
:obj:`False` if object represents just ASN.1 schema.
:obj:`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).
"""
if self._componentValues is noValue:
return False
if len(self._componentValues) != len(self):
return False
for componentValue in self._componentValues.values():
if componentValue is noValue or not componentValue.isValue:
return False
return True
@property
def isInconsistent(self):
"""Run necessary checks to ensure |ASN.1| object consistency.
Default action is to verify |ASN.1| object against constraints imposed
by `subtypeSpec`.
Raises
------
:py:class:`~pyasn1.error.PyAsn1tError` on any inconsistencies found
"""
if self.componentType is noValue or not self.subtypeSpec:
return False
if self._componentValues is noValue:
return True
mapping = {}
for idx, value in self._componentValues.items():
# Absent fields are not in the mapping
if value is noValue:
continue
mapping[idx] = value
try:
# Represent SequenceOf/SetOf as a bare dict to constraints chain
self.subtypeSpec(mapping)
except error.PyAsn1Error:
exc = sys.exc_info()[1]
return exc
return False
class SequenceOf(SequenceOfAndSetOfBase):
__doc__ = SequenceOfAndSetOfBase.__doc__
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.initTagSet(
tag.Tag(tag.tagClassUniversal, tag.tagFormatConstructed, 0x10)
)
#: Default :py:class:`~pyasn1.type.base.PyAsn1Item` derivative
#: object representing ASN.1 type allowed within |ASN.1| type
componentType = None
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` object
#: imposing constraints on |ASN.1| type initialization values.
subtypeSpec = constraint.ConstraintsIntersection()
# Disambiguation ASN.1 types identification
typeId = SequenceOfAndSetOfBase.getTypeId()
class SetOf(SequenceOfAndSetOfBase):
__doc__ = SequenceOfAndSetOfBase.__doc__
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.initTagSet(
tag.Tag(tag.tagClassUniversal, tag.tagFormatConstructed, 0x11)
)
#: Default :py:class:`~pyasn1.type.base.PyAsn1Item` derivative
#: object representing ASN.1 type allowed within |ASN.1| type
componentType = None
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` object
#: imposing constraints on |ASN.1| type initialization values.
subtypeSpec = constraint.ConstraintsIntersection()
# Disambiguation ASN.1 types identification
typeId = SequenceOfAndSetOfBase.getTypeId()
class SequenceAndSetBase(base.ConstructedAsn1Type):
"""Create |ASN.1| schema or value object.
|ASN.1| class is based on :class:`~pyasn1.type.base.ConstructedAsn1Type`,
its objects are mutable and duck-type Python :class:`dict` objects.
Keyword Args
------------
componentType: :py:class:`~pyasn1.type.namedtype.NamedType`
Object holding named ASN.1 types allowed within this collection
tagSet: :py:class:`~pyasn1.type.tag.TagSet`
Object representing non-default ASN.1 tag(s)
subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
Object representing non-default ASN.1 subtype constraint(s). Constraints
verification for |ASN.1| type can only occur on explicit
`.isInconsistent` call.
Examples
--------
.. code-block:: python
class Description(Sequence): # Set is similar
'''
ASN.1 specification:
Description ::= SEQUENCE {
surname IA5String,
first-name IA5String OPTIONAL,
age INTEGER DEFAULT 40
}
'''
componentType = NamedTypes(
NamedType('surname', IA5String()),
OptionalNamedType('first-name', IA5String()),
DefaultedNamedType('age', Integer(40))
)
descr = Description()
descr['surname'] = 'Smith'
descr['first-name'] = 'John'
"""
#: Default :py:class:`~pyasn1.type.namedtype.NamedTypes`
#: object representing named ASN.1 types allowed within |ASN.1| type
componentType = namedtype.NamedTypes()
class DynamicNames(object):
"""Fields names/positions mapping for component-less objects"""
def __init__(self):
self._keyToIdxMap = {}
self._idxToKeyMap = {}
def __len__(self):
return len(self._keyToIdxMap)
def __contains__(self, item):
return item in self._keyToIdxMap or item in self._idxToKeyMap
def __iter__(self):
return (self._idxToKeyMap[idx] for idx in range(len(self._idxToKeyMap)))
def __getitem__(self, item):
try:
return self._keyToIdxMap[item]
except KeyError:
return self._idxToKeyMap[item]
def getNameByPosition(self, idx):
try:
return self._idxToKeyMap[idx]
except KeyError:
raise error.PyAsn1Error('Type position out of range')
def getPositionByName(self, name):
try:
return self._keyToIdxMap[name]
except KeyError:
raise error.PyAsn1Error('Name %s not found' % (name,))
def addField(self, idx):
self._keyToIdxMap['field-%d' % idx] = idx
self._idxToKeyMap[idx] = 'field-%d' % idx
def __init__(self, **kwargs):
base.ConstructedAsn1Type.__init__(self, **kwargs)
self._componentTypeLen = len(self.componentType)
if self._componentTypeLen:
self._componentValues = []
else:
self._componentValues = noValue
self._dynamicNames = self._componentTypeLen or self.DynamicNames()
def __getitem__(self, idx):
if octets.isStringType(idx):
try:
return self.getComponentByName(idx)
except error.PyAsn1Error:
# duck-typing dict
raise KeyError(sys.exc_info()[1])
else:
try:
return self.getComponentByPosition(idx)
except error.PyAsn1Error:
# duck-typing list
raise IndexError(sys.exc_info()[1])
def __setitem__(self, idx, value):
if octets.isStringType(idx):
try:
self.setComponentByName(idx, value)
except error.PyAsn1Error:
# duck-typing dict
raise KeyError(sys.exc_info()[1])
else:
try:
self.setComponentByPosition(idx, value)
except error.PyAsn1Error:
# duck-typing list
raise IndexError(sys.exc_info()[1])
def __contains__(self, key):
if self._componentTypeLen:
return key in self.componentType
else:
return key in self._dynamicNames
def __len__(self):
return len(self._componentValues)
def __iter__(self):
return iter(self.componentType or self._dynamicNames)
# Python dict protocol
def values(self):
for idx in range(self._componentTypeLen or len(self._dynamicNames)):
yield self[idx]
def keys(self):
return iter(self)
def items(self):
for idx in range(self._componentTypeLen or len(self._dynamicNames)):
if self._componentTypeLen:
yield self.componentType[idx].name, self[idx]
else:
yield self._dynamicNames[idx], self[idx]
def update(self, *iterValue, **mappingValue):
for k, v in iterValue:
self[k] = v
for k in mappingValue:
self[k] = mappingValue[k]
def clear(self):
"""Remove all components and become an empty |ASN.1| value object.
Has the same effect on |ASN.1| object as it does on :class:`dict`
built-in.
"""
self._componentValues = []
self._dynamicNames = self.DynamicNames()
return self
def reset(self):
"""Remove all components and become a |ASN.1| schema object.
See :meth:`isValue` property for more information on the
distinction between value and schema objects.
"""
self._componentValues = noValue
self._dynamicNames = self.DynamicNames()
return self
@property
def components(self):
return self._componentValues
def _cloneComponentValues(self, myClone, cloneValueFlag):
if self._componentValues is noValue:
return
for idx, componentValue in enumerate(self._componentValues):
if componentValue is not noValue:
if isinstance(componentValue, base.ConstructedAsn1Type):
myClone.setComponentByPosition(
idx, componentValue.clone(cloneValueFlag=cloneValueFlag)
)
else:
myClone.setComponentByPosition(idx, componentValue.clone())
def getComponentByName(self, name, default=noValue, instantiate=True):
"""Returns |ASN.1| type component by name.
Equivalent to Python :class:`dict` subscription operation (e.g. `[]`).
Parameters
----------
name: :class:`str`
|ASN.1| type component name
Keyword Args
------------
default: :class:`object`
If set and requested component is a schema object, return the `default`
object instead of the requested component.
instantiate: :class:`bool`
If :obj:`True` (default), inner component will be automatically
instantiated.
If :obj:`False` either existing component or the :class:`NoValue`
object will be returned.
Returns
-------
: :py:class:`~pyasn1.type.base.PyAsn1Item`
Instantiate |ASN.1| component type or return existing
component value
"""
if self._componentTypeLen:
idx = self.componentType.getPositionByName(name)
else:
try:
idx = self._dynamicNames.getPositionByName(name)
except KeyError:
raise error.PyAsn1Error('Name %s not found' % (name,))
return self.getComponentByPosition(idx, default=default, instantiate=instantiate)
def setComponentByName(self, name, value=noValue,
verifyConstraints=True,
matchTags=True,
matchConstraints=True):
"""Assign |ASN.1| type component by name.
Equivalent to Python :class:`dict` item assignment operation (e.g. `[]`).
Parameters
----------
name: :class:`str`
|ASN.1| type component name
Keyword Args
------------
value: :class:`object` or :py:class:`~pyasn1.type.base.PyAsn1Item` derivative
A Python value to initialize |ASN.1| component with (if *componentType* is set)
or ASN.1 value object to assign to |ASN.1| component.
If `value` is not given, schema object will be set as a component.
verifyConstraints: :class:`bool`
If :obj:`False`, skip constraints validation
matchTags: :class:`bool`
If :obj:`False`, skip component tags matching
matchConstraints: :class:`bool`
If :obj:`False`, skip component constraints matching
Returns
-------
self
"""
if self._componentTypeLen:
idx = self.componentType.getPositionByName(name)
else:
try:
idx = self._dynamicNames.getPositionByName(name)
except KeyError:
raise error.PyAsn1Error('Name %s not found' % (name,))
return self.setComponentByPosition(
idx, value, verifyConstraints, matchTags, matchConstraints
)
def getComponentByPosition(self, idx, default=noValue, instantiate=True):
"""Returns |ASN.1| type component by index.
Equivalent to Python sequence subscription operation (e.g. `[]`).
Parameters
----------
idx: :class:`int`
Component index (zero-based). Must either refer to an existing
component or (if *componentType* is set) new ASN.1 schema object gets
instantiated.
Keyword Args
------------
default: :class:`object`
If set and requested component is a schema object, return the `default`
object instead of the requested component.
instantiate: :class:`bool`
If :obj:`True` (default), inner component will be automatically
instantiated.
If :obj:`False` either existing component or the :class:`NoValue`
object will be returned.
Returns
-------
: :py:class:`~pyasn1.type.base.PyAsn1Item`
a PyASN1 object
Examples
--------
.. code-block:: python
# can also be Set
class MySequence(Sequence):
componentType = NamedTypes(
NamedType('id', OctetString())
)
s = MySequence()
# returns component #0 with `.isValue` property False
s.getComponentByPosition(0)
# returns None
s.getComponentByPosition(0, default=None)
s.clear()
# returns noValue
s.getComponentByPosition(0, instantiate=False)
# sets component #0 to OctetString() ASN.1 schema
# object and returns it
s.getComponentByPosition(0, instantiate=True)
# sets component #0 to ASN.1 value object
s.setComponentByPosition(0, 'ABCD')
# returns OctetString('ABCD') value object
s.getComponentByPosition(0, instantiate=False)
s.clear()
# returns noValue
s.getComponentByPosition(0, instantiate=False)
"""
try:
if self._componentValues is noValue:
componentValue = noValue
else:
componentValue = self._componentValues[idx]
except IndexError:
componentValue = noValue
if not instantiate:
if componentValue is noValue or not componentValue.isValue:
return default
else:
return componentValue
if componentValue is noValue:
self.setComponentByPosition(idx)
componentValue = self._componentValues[idx]
if default is noValue or componentValue.isValue:
return componentValue
else:
return default
def setComponentByPosition(self, idx, value=noValue,
verifyConstraints=True,
matchTags=True,
matchConstraints=True):
"""Assign |ASN.1| type component by position.
Equivalent to Python sequence item assignment operation (e.g. `[]`).
Parameters
----------
idx : :class:`int`
Component index (zero-based). Must either refer to existing
component (if *componentType* is set) or to N+1 component
otherwise. In the latter case a new component of given ASN.1
type gets instantiated and appended to |ASN.1| sequence.
Keyword Args
------------
value: :class:`object` or :py:class:`~pyasn1.type.base.PyAsn1Item` derivative
A Python value to initialize |ASN.1| component with (if *componentType* is set)
or ASN.1 value object to assign to |ASN.1| component.
If `value` is not given, schema object will be set as a component.
verifyConstraints : :class:`bool`
If :obj:`False`, skip constraints validation
matchTags: :class:`bool`
If :obj:`False`, skip component tags matching
matchConstraints: :class:`bool`
If :obj:`False`, skip component constraints matching
Returns
-------
self
"""
componentType = self.componentType
componentTypeLen = self._componentTypeLen
if self._componentValues is noValue:
componentValues = []
else:
componentValues = self._componentValues
try:
currentValue = componentValues[idx]
except IndexError:
currentValue = noValue
if componentTypeLen:
if componentTypeLen < idx:
raise error.PyAsn1Error('component index out of range')
componentValues = [noValue] * componentTypeLen
if value is noValue:
if componentTypeLen:
value = componentType.getTypeByPosition(idx)
if isinstance(value, base.ConstructedAsn1Type):
value = value.clone(cloneValueFlag=componentType[idx].isDefaulted)
elif currentValue is noValue:
raise error.PyAsn1Error('Component type not defined')
elif not isinstance(value, base.Asn1Item):
if componentTypeLen:
subComponentType = componentType.getTypeByPosition(idx)
if isinstance(subComponentType, base.SimpleAsn1Type):
value = subComponentType.clone(value=value)
else:
raise error.PyAsn1Error('%s can cast only scalar values' % componentType.__class__.__name__)
elif currentValue is not noValue and isinstance(currentValue, base.SimpleAsn1Type):
value = currentValue.clone(value=value)
else:
raise error.PyAsn1Error('%s undefined component type' % componentType.__class__.__name__)
elif ((verifyConstraints or matchTags or matchConstraints) and
componentTypeLen):
subComponentType = componentType.getTypeByPosition(idx)
if subComponentType is not noValue:
subtypeChecker = (self.strictConstraints and
subComponentType.isSameTypeWith or
subComponentType.isSuperTypeOf)
if not subtypeChecker(value, verifyConstraints and matchTags,
verifyConstraints and matchConstraints):
if not componentType[idx].openType:
raise error.PyAsn1Error('Component value is tag-incompatible: %r vs %r' % (value, componentType))
if componentTypeLen or idx in self._dynamicNames:
componentValues[idx] = value
elif len(componentValues) == idx:
componentValues.append(value)
self._dynamicNames.addField(idx)
else:
raise error.PyAsn1Error('Component index out of range')
self._componentValues = componentValues
return self
@property
def isValue(self):
"""Indicate that |ASN.1| object represents ASN.1 value.
If *isValue* is :obj:`False` then this object represents just ASN.1 schema.
If *isValue* is :obj:`True` then, in addition to its ASN.1 schema features,
this object can also be used like a Python built-in object (e.g.
:class:`int`, :class:`str`, :class:`dict` etc.).
Returns
-------
: :class:`bool`
:obj:`False` if object represents just ASN.1 schema.
:obj:`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).
It is sufficient for |ASN.1| objects to have all non-optional and non-defaulted
components being value objects to be considered as a value objects as a whole.
In other words, even having one or more optional components not turned into
value objects, |ASN.1| object is still considered as a value object. Defaulted
components are normally value objects by default.
"""
if self._componentValues is noValue:
return False
componentType = self.componentType
if componentType:
for idx, subComponentType in enumerate(componentType.namedTypes):
if subComponentType.isDefaulted or subComponentType.isOptional:
continue
if not self._componentValues:
return False
componentValue = self._componentValues[idx]
if componentValue is noValue or not componentValue.isValue:
return False
else:
for componentValue in self._componentValues:
if componentValue is noValue or not componentValue.isValue:
return False
return True
@property
def isInconsistent(self):
"""Run necessary checks to ensure |ASN.1| object consistency.
Default action is to verify |ASN.1| object against constraints imposed
by `subtypeSpec`.
Raises
------
:py:class:`~pyasn1.error.PyAsn1tError` on any inconsistencies found
"""
if self.componentType is noValue or not self.subtypeSpec:
return False
if self._componentValues is noValue:
return True
mapping = {}
for idx, value in enumerate(self._componentValues):
# Absent fields are not in the mapping
if value is noValue:
continue
name = self.componentType.getNameByPosition(idx)
mapping[name] = value
try:
# Represent Sequence/Set as a bare dict to constraints chain
self.subtypeSpec(mapping)
except error.PyAsn1Error:
exc = sys.exc_info()[1]
return exc
return False
def prettyPrint(self, scope=0):
"""Return an object representation string.
Returns
-------
: :class:`str`
Human-friendly object representation.
"""
scope += 1
representation = self.__class__.__name__ + ':\n'
for idx, componentValue in enumerate(self._componentValues):
if componentValue is not noValue and componentValue.isValue:
representation += ' ' * scope
if self.componentType:
representation += self.componentType.getNameByPosition(idx)
else:
representation += self._dynamicNames.getNameByPosition(idx)
representation = '%s=%s\n' % (
representation, componentValue.prettyPrint(scope)
)
return representation
def prettyPrintType(self, scope=0):
scope += 1
representation = '%s -> %s {\n' % (self.tagSet, self.__class__.__name__)
for idx, componentType in enumerate(self.componentType.values() or self._componentValues):
representation += ' ' * scope
if self.componentType:
representation += '"%s"' % self.componentType.getNameByPosition(idx)
else:
representation += '"%s"' % self._dynamicNames.getNameByPosition(idx)
representation = '%s = %s\n' % (
representation, componentType.prettyPrintType(scope)
)
return representation + '\n' + ' ' * (scope - 1) + '}'
# backward compatibility
def setDefaultComponents(self):
return self
def getComponentType(self):
if self._componentTypeLen:
return self.componentType
def getNameByPosition(self, idx):
if self._componentTypeLen:
return self.componentType[idx].name
class Sequence(SequenceAndSetBase):
__doc__ = SequenceAndSetBase.__doc__
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.initTagSet(
tag.Tag(tag.tagClassUniversal, tag.tagFormatConstructed, 0x10)
)
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` object
#: imposing constraints on |ASN.1| type initialization values.
subtypeSpec = constraint.ConstraintsIntersection()
#: Default collection of ASN.1 types of component (e.g. :py:class:`~pyasn1.type.namedtype.NamedType`)
#: object imposing size constraint on |ASN.1| objects
componentType = namedtype.NamedTypes()
# Disambiguation ASN.1 types identification
typeId = SequenceAndSetBase.getTypeId()
# backward compatibility
def getComponentTagMapNearPosition(self, idx):
if self.componentType:
return self.componentType.getTagMapNearPosition(idx)
def getComponentPositionNearType(self, tagSet, idx):
if self.componentType:
return self.componentType.getPositionNearType(tagSet, idx)
else:
return idx
class Set(SequenceAndSetBase):
__doc__ = SequenceAndSetBase.__doc__
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.initTagSet(
tag.Tag(tag.tagClassUniversal, tag.tagFormatConstructed, 0x11)
)
#: Default collection of ASN.1 types of component (e.g. :py:class:`~pyasn1.type.namedtype.NamedType`)
#: object representing ASN.1 type allowed within |ASN.1| type
componentType = namedtype.NamedTypes()
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` object
#: imposing constraints on |ASN.1| type initialization values.
subtypeSpec = constraint.ConstraintsIntersection()
# Disambiguation ASN.1 types identification
typeId = SequenceAndSetBase.getTypeId()
def getComponent(self, innerFlag=False):
return self
def getComponentByType(self, tagSet, default=noValue,
instantiate=True, innerFlag=False):
"""Returns |ASN.1| type component by ASN.1 tag.
Parameters
----------
tagSet : :py:class:`~pyasn1.type.tag.TagSet`
Object representing ASN.1 tags to identify one of
|ASN.1| object component
Keyword Args
------------
default: :class:`object`
If set and requested component is a schema object, return the `default`
object instead of the requested component.
instantiate: :class:`bool`
If :obj:`True` (default), inner component will be automatically
instantiated.
If :obj:`False` either existing component or the :class:`noValue`
object will be returned.
Returns
-------
: :py:class:`~pyasn1.type.base.PyAsn1Item`
a pyasn1 object
"""
componentValue = self.getComponentByPosition(
self.componentType.getPositionByType(tagSet),
default=default, instantiate=instantiate
)
if innerFlag and isinstance(componentValue, Set):
# get inner component by inner tagSet
return componentValue.getComponent(innerFlag=True)
else:
# get outer component by inner tagSet
return componentValue
def setComponentByType(self, tagSet, value=noValue,
verifyConstraints=True,
matchTags=True,
matchConstraints=True,
innerFlag=False):
"""Assign |ASN.1| type component by ASN.1 tag.
Parameters
----------
tagSet : :py:class:`~pyasn1.type.tag.TagSet`
Object representing ASN.1 tags to identify one of
|ASN.1| object component
Keyword Args
------------
value: :class:`object` or :py:class:`~pyasn1.type.base.PyAsn1Item` derivative
A Python value to initialize |ASN.1| component with (if *componentType* is set)
or ASN.1 value object to assign to |ASN.1| component.
If `value` is not given, schema object will be set as a component.
verifyConstraints : :class:`bool`
If :obj:`False`, skip constraints validation
matchTags: :class:`bool`
If :obj:`False`, skip component tags matching
matchConstraints: :class:`bool`
If :obj:`False`, skip component constraints matching
innerFlag: :class:`bool`
If :obj:`True`, search for matching *tagSet* recursively.
Returns
-------
self
"""
idx = self.componentType.getPositionByType(tagSet)
if innerFlag: # set inner component by inner tagSet
componentType = self.componentType.getTypeByPosition(idx)
if componentType.tagSet:
return self.setComponentByPosition(
idx, value, verifyConstraints, matchTags, matchConstraints
)
else:
componentType = self.getComponentByPosition(idx)
return componentType.setComponentByType(
tagSet, value, verifyConstraints, matchTags, matchConstraints, innerFlag=innerFlag
)
else: # set outer component by inner tagSet
return self.setComponentByPosition(
idx, value, verifyConstraints, matchTags, matchConstraints
)
@property
def componentTagMap(self):
if self.componentType:
return self.componentType.tagMapUnique
class Choice(Set):
"""Create |ASN.1| schema or value object.
|ASN.1| class is based on :class:`~pyasn1.type.base.ConstructedAsn1Type`,
its objects are mutable and duck-type Python :class:`list` objects.
Keyword Args
------------
componentType: :py:class:`~pyasn1.type.namedtype.NamedType`
Object holding named ASN.1 types allowed within this collection
tagSet: :py:class:`~pyasn1.type.tag.TagSet`
Object representing non-default ASN.1 tag(s)
subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
Object representing non-default ASN.1 subtype constraint(s). Constraints
verification for |ASN.1| type can only occur on explicit
`.isInconsistent` call.
Examples
--------
.. code-block:: python
class Afters(Choice):
'''
ASN.1 specification:
Afters ::= CHOICE {
cheese [0] IA5String,
dessert [1] IA5String
}
'''
componentType = NamedTypes(
NamedType('cheese', IA5String().subtype(
implicitTag=Tag(tagClassContext, tagFormatSimple, 0)
),
NamedType('dessert', IA5String().subtype(
implicitTag=Tag(tagClassContext, tagFormatSimple, 1)
)
)
afters = Afters()
afters['cheese'] = 'Mascarpone'
"""
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.TagSet() # untagged
#: Default collection of ASN.1 types of component (e.g. :py:class:`~pyasn1.type.namedtype.NamedType`)
#: object representing ASN.1 type allowed within |ASN.1| type
componentType = namedtype.NamedTypes()
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` object
#: imposing constraints on |ASN.1| type initialization values.
subtypeSpec = constraint.ConstraintsIntersection(
constraint.ValueSizeConstraint(1, 1)
)
# Disambiguation ASN.1 types identification
typeId = Set.getTypeId()
_currentIdx = None
def __eq__(self, other):
if self._componentValues:
return self._componentValues[self._currentIdx] == other
return NotImplemented
def __ne__(self, other):
if self._componentValues:
return self._componentValues[self._currentIdx] != other
return NotImplemented
def __lt__(self, other):
if self._componentValues:
return self._componentValues[self._currentIdx] < other
return NotImplemented
def __le__(self, other):
if self._componentValues:
return self._componentValues[self._currentIdx] <= other
return NotImplemented
def __gt__(self, other):
if self._componentValues:
return self._componentValues[self._currentIdx] > other
return NotImplemented
def __ge__(self, other):
if self._componentValues:
return self._componentValues[self._currentIdx] >= other
return NotImplemented
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 self._currentIdx is not None and 1 or 0
def __contains__(self, key):
if self._currentIdx is None:
return False
return key == self.componentType[self._currentIdx].getName()
def __iter__(self):
if self._currentIdx is None:
raise StopIteration
yield self.componentType[self._currentIdx].getName()
# Python dict protocol
def values(self):
if self._currentIdx is not None:
yield self._componentValues[self._currentIdx]
def keys(self):
if self._currentIdx is not None:
yield self.componentType[self._currentIdx].getName()
def items(self):
if self._currentIdx is not None:
yield self.componentType[self._currentIdx].getName(), self[self._currentIdx]
def checkConsistency(self):
if self._currentIdx is None:
raise error.PyAsn1Error('Component not chosen')
def _cloneComponentValues(self, myClone, cloneValueFlag):
try:
component = self.getComponent()
except error.PyAsn1Error:
pass
else:
if isinstance(component, Choice):
tagSet = component.effectiveTagSet
else:
tagSet = component.tagSet
if isinstance(component, base.ConstructedAsn1Type):
myClone.setComponentByType(
tagSet, component.clone(cloneValueFlag=cloneValueFlag)
)
else:
myClone.setComponentByType(tagSet, component.clone())
def getComponentByPosition(self, idx, default=noValue, instantiate=True):
__doc__ = Set.__doc__
if self._currentIdx is None or self._currentIdx != idx:
return Set.getComponentByPosition(self, idx, default=default,
instantiate=instantiate)
return self._componentValues[idx]
def setComponentByPosition(self, idx, value=noValue,
verifyConstraints=True,
matchTags=True,
matchConstraints=True):
"""Assign |ASN.1| type component by position.
Equivalent to Python sequence item assignment operation (e.g. `[]`).
Parameters
----------
idx: :class:`int`
Component index (zero-based). Must either refer to existing
component or to N+1 component. In the latter case a new component
type gets instantiated (if *componentType* is set, or given ASN.1
object is taken otherwise) and appended to the |ASN.1| sequence.
Keyword Args
------------
value: :class:`object` or :py:class:`~pyasn1.type.base.PyAsn1Item` derivative
A Python value to initialize |ASN.1| component with (if *componentType* is set)
or ASN.1 value object to assign to |ASN.1| component. Once a new value is
set to *idx* component, previous value is dropped.
If `value` is not given, schema object will be set as a component.
verifyConstraints : :class:`bool`
If :obj:`False`, skip constraints validation
matchTags: :class:`bool`
If :obj:`False`, skip component tags matching
matchConstraints: :class:`bool`
If :obj:`False`, skip component constraints matching
Returns
-------
self
"""
oldIdx = self._currentIdx
Set.setComponentByPosition(self, idx, value, verifyConstraints, matchTags, matchConstraints)
self._currentIdx = idx
if oldIdx is not None and oldIdx != idx:
self._componentValues[oldIdx] = noValue
return self
@property
def effectiveTagSet(self):
"""Return a :class:`~pyasn1.type.tag.TagSet` object of the currently initialized component or self (if |ASN.1| is tagged)."""
if self.tagSet:
return self.tagSet
else:
component = self.getComponent()
return component.effectiveTagSet
@property
def tagMap(self):
""""Return a :class:`~pyasn1.type.tagmap.TagMap` object mapping
ASN.1 tags to ASN.1 objects contained within callee.
"""
if self.tagSet:
return Set.tagMap.fget(self)
else:
return self.componentType.tagMapUnique
def getComponent(self, innerFlag=False):
"""Return currently assigned component of the |ASN.1| object.
Returns
-------
: :py:class:`~pyasn1.type.base.PyAsn1Item`
a PyASN1 object
"""
if self._currentIdx is None:
raise error.PyAsn1Error('Component not chosen')
else:
c = self._componentValues[self._currentIdx]
if innerFlag and isinstance(c, Choice):
return c.getComponent(innerFlag)
else:
return c
def getName(self, innerFlag=False):
"""Return the name of currently assigned component of the |ASN.1| object.
Returns
-------
: :py:class:`str`
|ASN.1| component name
"""
if self._currentIdx is None:
raise error.PyAsn1Error('Component not chosen')
else:
if innerFlag:
c = self._componentValues[self._currentIdx]
if isinstance(c, Choice):
return c.getName(innerFlag)
return self.componentType.getNameByPosition(self._currentIdx)
@property
def isValue(self):
"""Indicate that |ASN.1| object represents ASN.1 value.
If *isValue* is :obj:`False` then this object represents just ASN.1 schema.
If *isValue* is :obj:`True` then, in addition to its ASN.1 schema features,
this object can also be used like a Python built-in object (e.g.
:class:`int`, :class:`str`, :class:`dict` etc.).
Returns
-------
: :class:`bool`
:obj:`False` if object represents just ASN.1 schema.
:obj:`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).
"""
if self._currentIdx is None:
return False
componentValue = self._componentValues[self._currentIdx]
return componentValue is not noValue and componentValue.isValue
def clear(self):
self._currentIdx = None
return Set.clear(self)
# compatibility stubs
def getMinTagSet(self):
return self.minTagSet
class Any(OctetString):
"""Create |ASN.1| schema or value object.
|ASN.1| class is based on :class:`~pyasn1.type.base.SimpleAsn1Type`,
its objects are immutable and duck-type Python 2 :class:`str` or Python 3
:class:`bytes`. When used in Unicode context, |ASN.1| type assumes
"|encoding|" serialisation.
Keyword Args
------------
value: :class:`unicode`, :class:`str`, :class:`bytes` or |ASN.1| object
:class:`str` (Python 2) or :class:`bytes` (Python 3), alternatively
:class:`unicode` object (Python 2) or :class:`str` (Python 3)
representing character string to be serialised into octets (note
`encoding` parameter) or |ASN.1| object.
If `value` is not given, schema object will be created.
tagSet: :py:class:`~pyasn1.type.tag.TagSet`
Object representing non-default ASN.1 tag(s)
subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
Object representing non-default ASN.1 subtype constraint(s). Constraints
verification for |ASN.1| type occurs automatically on object
instantiation.
encoding: :py:class:`str`
Unicode codec ID to encode/decode :class:`unicode` (Python 2) or
:class:`str` (Python 3) the payload when |ASN.1| object is used
in text string context.
binValue: :py:class:`str`
Binary string initializer to use instead of the *value*.
Example: '10110011'.
hexValue: :py:class:`str`
Hexadecimal string initializer to use instead of the *value*.
Example: 'DEADBEEF'.
Raises
------
~pyasn1.error.ValueConstraintError, ~pyasn1.error.PyAsn1Error
On constraint violation or bad initializer.
Examples
--------
.. code-block:: python
class Error(Sequence):
'''
ASN.1 specification:
Error ::= SEQUENCE {
code INTEGER,
parameter ANY DEFINED BY code -- Either INTEGER or REAL
}
'''
componentType=NamedTypes(
NamedType('code', Integer()),
NamedType('parameter', Any(),
openType=OpenType('code', {1: Integer(),
2: Real()}))
)
error = Error()
error['code'] = 1
error['parameter'] = Integer(1234)
"""
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.tag.TagSet` object representing ASN.1 tag(s)
#: associated with |ASN.1| type.
tagSet = tag.TagSet() # untagged
#: Set (on class, not on instance) or return a
#: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` object
#: imposing constraints on |ASN.1| type initialization values.
subtypeSpec = constraint.ConstraintsIntersection()
# Disambiguation ASN.1 types identification
typeId = OctetString.getTypeId()
@property
def tagMap(self):
""""Return a :class:`~pyasn1.type.tagmap.TagMap` object mapping
ASN.1 tags to ASN.1 objects contained within callee.
"""
try:
return self._tagMap
except AttributeError:
self._tagMap = tagmap.TagMap(
{self.tagSet: self},
{eoo.endOfOctets.tagSet: eoo.endOfOctets},
self
)
return self._tagMap
# XXX
# coercion rules?
Mini Shell