8000 encode() modifies object, selects value for DefaultedNamedType field · Issue #53 · pyasn1/pyasn1 · GitHub
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jefferyto opened this issue Nov 28, 2023 · 0 comments
Open

encode() modifies object, selects value for DefaultedNamedType field #53

jefferyto opened this issue Nov 28, 2023 · 0 comments

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@jefferyto
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I'm updating the pyasn1 package for OpenWrt to 0.5.1, and testing with the example from the readme:

Python 3.11.6 (main, Nov 23 2023, 21:55:55) [GCC 12.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from pyasn1.type import namedtype
>>> from pyasn1.type import tag
>>> from pyasn1.type import univ
>>> from pyasn1.codec.der.encoder import encode
>>> from pyasn1.codec.der.decoder import decode
>>>
>>> class Record(univ.Sequence):
...     componentType = namedtype.NamedTypes(
...         namedtype.NamedType('id', univ.Integer()),
...         namedtype.OptionalNamedType(
...             'room', univ.Integer().subtype(
...                 implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0)
...             )
...         ),
...         namedtype.DefaultedNamedType(
...             'house', univ.Integer(0).subtype(
...                 implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 1)
...             )
...         )
...     )
...
>>> r1 = Record()
>>> r1['id'] = 123
>>> r1['room'] = 321
>>>
>>> r2 = Record()
>>> r2['id'] = 123
>>> r2['room'] = 321
>>>
>>> r1 == r2
True
>>> encode(r1)
b'0\x07\x02\x01{\x80\x02\x01A'
>>> r1 == r2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.11/site-packages/pyasn1/type/base.py", line 549, in __eq__
  File "/usr/lib/python3.11/site-packages/pyasn1/type/base.py", line 549, in __eq__
  File "/usr/lib/python3.11/site-packages/pyasn1/type/base.py", line 213, in plug
pyasn1.error.PyAsn1Error: Attempted "__eq__" operation on ASN.1 schema object
>>> r1
<Record value object, tagSet=<TagSet object, tags 0:32:16>, subtypeSpec=<ConstraintsIntersection object>, componentType=<NamedTypes object, types <NamedType object, type id=<Integer schema object, tagSet <TagSet object, tags 0:0:2>>>, <OptionalNamedType object, type room=<Integer schema object, tagSet <TagSet object, tags 128:0:0>>>, <DefaultedNamedType object, type house=<Integer value object, tagSet <TagSet object, tags 128:0:1>, payload [0]>>>, sizeSpec=<ConstraintsIntersection object>, payload [<Integer value object, tagSet <TagSet object, tags 0:0:2>, payload [123]>, <Integer value object, tagSet <TagSet object, tags 128:0:0>, payload [321]>, <Integer value object, tagSet <TagSet object, tags 128:0:1>, payload [0]>]>
>>> r2
<Record value object, tagSet=<TagSet object, tags 0:32:16>, subtypeSpec=<ConstraintsIntersection object>, componentType=<NamedTypes object, types <NamedType object, type id=<Integer schema object, tagSet <TagSet object, tags 0:0:2>>>, <OptionalNamedType object, type room=<Integer schema object, tagSet <TagSet object, tags 128:0:0>>>, <DefaultedNamedType object, type house=<Integer value object, tagSet <TagSet object, tags 128:0:1>, payload [0]>>>, sizeSpec=<ConstraintsIntersection object>, payload [<Integer value object, tagSet <TagSet object, tags 0:0:2>, payload [123]>, <Integer value object, tagSet <TagSet object, tags 128:0:0>, payload [321]>, <NoValue object>]>
>>> str(r1)
'Record:\n id=123\n room=321\n house=0\n'
>>> str(r2)
'Record:\n id=123\n room=321\n'
>>>

I've also tried the native encoder (pyasn1.codec.native.encoder.encode) and I get the same result.

I'm not sure if this is an issue or expected behaviour, but I wouldn't expect serializing a ASN.1 object would modify the object itself.
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