Python pyasn1.error 模块，PyAsn1Error() 实例源码
我们从Python开源项目中，提取了以下50个代码示例，用于说明如何使用pyasn1.error.PyAsn1Error()。
def prettyIn(self, value):
if not isinstance(value, str):
try:
return int(value)
except:
raise error.PyAsn1Error(
'Can\'t coerce %r into integer: %s' % (value, sys.exc_info()[1])
)
r = self.__namedValues.getValue(value)
if r is not None:
return r
try:
return int(value)
except:
raise error.PyAsn1Error(
'Can\'t coerce %r into integer: %s' % (value, sys.exc_info()[1])
)
def prettyIn(self, value):
if isinstance(value, str):
return value
elif isinstance(value, unicode):
try:
return value.encode(self._encoding)
except (LookupError, UnicodeEncodeError):
raise error.PyAsn1Error(
'Can\'t encode string \'%s\' with \'%s\' codec' % (value, self._encoding)
)
elif isinstance(value, (tuple, list)):
try:
return ''.join([ chr(x) for x in value ])
except ValueError:
raise error.PyAsn1Error(
'Bad OctetString initializer \'%s\'' % (value,)
)
else:
return str(value)
def fromBinaryString(self, value):
bitNo = 8; byte = 0; r = ()
for v in value:
if bitNo:
bitNo = bitNo - 1
else:
bitNo = 7
r = r + (byte,)
byte = 0
if v == '0':
v = 0
elif v == '1':
v = 1
else:
raise error.PyAsn1Error(
'Non-binary OCTET STRING initializer %s' % (v,)
)
byte = byte | (v << bitNo)
return octets.ints2octs(r + (byte,))
def _cloneComponentValues(self, myClone, cloneValueFlag):
try:
c = self.getComponent()
except error.PyAsn1Error:
pass
else:
if isinstance(c, Choice):
tagSet = c.getEffectiveTagSet()
else:
tagSet = c.getTagSet()
if isinstance(c, base.AbstractConstructedAsn1Item):
myClone.setComponentByType(
tagSet, c.clone(cloneValueFlag=cloneValueFlag)
)
else:
myClone.setComponentByType(tagSet, c.clone())
def clone(self, parentType, tagMap, uniq=False):
if self.__defType is not None and tagMap.getDef() is not None:
raise error.PyAsn1Error('Duplicate default value at %s' % (self,))
if tagMap.getDef() is not None:
defType = tagMap.getDef()
else:
defType = self.__defType
posMap = self.__posMap.copy()
for k in tagMap.getPosMap():
if uniq and k in posMap:
raise error.PyAsn1Error('Duplicate positive key %s' % (k,))
posMap[k] = parentType
negMap = self.__negMap.copy()
negMap.update(tagMap.getNegMap())
return self.__class__(
posMap, negMap, defType,
)
def __init__(self, *namedValues):
self.nameTovalIdx = {}; self.valToNameIdx = {}
self.namedValues = ()
automaticVal = 1
for namedValue in namedValues:
if isinstance(namedValue, tuple):
name, val = namedValue
else:
name = namedValue
val = automaticVal
if name in self.nameTovalIdx:
raise error.PyAsn1Error('Duplicate name %s' % (name,))
self.nameTovalIdx[name] = val
if val in self.valToNameIdx:
raise error.PyAsn1Error('Duplicate value %s=%s' % (name, val))
self.valToNameIdx[val] = name
self.namedValues = self.namedValues + ((name, val),)
automaticVal = automaticVal + 1
def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length,
state, decodeFun, substrateFun):
head, tail = substrate[:length], substrate[length:]
if not head or length != 1:
raise error.PyAsn1Error('Not single-octet Boolean payload')
byte = oct2int(head[0])
# CER/DER specifies encoding of TRUE as 0xFF and FALSE as 0x0,while
# BER allows any non-zero value as TRUE; cf. sections 8.2.2. and 11.1
# in http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
if byte == 0xff:
value = 1
elif byte == 0x00:
value = 0
else:
raise error.PyAsn1Error('Unexpected Boolean payload: %s' % byte)
return self._createComponent(asn1Spec, value), tail
def indefLenValueDecoder(self,
length, state, substrateFun):
r = self._createComponent(asn1Spec, tagSet)
if substrateFun:
return substrateFun(r, length)
if r.getTagSet() == tagSet: # explicitly tagged Choice
component, substrate = decodeFun(substrate, r.getComponentTagMap())
# eat up EOO marker
eooMarker, allowEoo=True)
if not eoo.endOfOctets.isSameTypeWith(eooMarker) or \
eooMarker != eoo.endOfOctets:
raise error.PyAsn1Error('No EOO seen before substrate ends')
else:
component, substrate= decodeFun(
substrate, r.getComponentTagMap(), state
)
if isinstance(component, univ.Choice):
effectiveTagSet = component.getEffectiveTagSet()
else:
effectiveTagSet = component.getTagSet()
r.setComponentByType(effectiveTagSet, component, 0, asn1Spec is None)
return r, substrate
def __call__(self, value, defMode=True, maxChunkSize=0):
if not defMode and not self.supportIndefLength:
raise error.PyAsn1Error('Indefinite length encoding not supported by this codec')
debug.logger & debug.flagEncoder and debug.logger('encoder called in %sdef mode,chunk size %s for type %s,value:\n%s' % (not defMode and 'in' or '', maxChunkSize, value.prettyPrintType(), value.prettyPrint()))
tagSet = value.getTagSet()
if len(tagSet) > 1:
concreteEncoder = explicitlyTaggedItemEncoder
else:
if value.typeId is not None and value.typeId in self.__typeMap:
concreteEncoder = self.__typeMap[value.typeId]
elif tagSet in self.__tagMap:
concreteEncoder = self.__tagMap[tagSet]
else:
tagSet = value.baseTagSet
if tagSet in self.__tagMap:
concreteEncoder = self.__tagMap[tagSet]
else:
raise Error('No encoder for %s' % (value,))
debug.logger & debug.flagEncoder and debug.logger('using value codec %s chosen by %s' % (concreteEncoder.__class__.__name__, tagSet))
substrate = concreteEncoder.encode(
self, defMode, maxChunkSize
)
debug.logger & debug.flagEncoder and debug.logger('built %s octets of substrate: %s\nencoder completed' % (len(substrate), debug.hexdump(substrate)))
return substrate
def __init__(self,)
automaticVal = automaticVal + 1
def __call__(self, debug.hexdump(substrate)))
return substrate
def prettyIn(self, unicode):
try:
return value.encode(self.encoding)
except (LookupError, UnicodeEncodeError):
raise error.PyAsn1Error(
"Can't encode string '%s' with codec %s" % (value, self.encoding)
)
elif isinstance(value, 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 prettyIn(self, bytes):
return value
elif isinstance(value, str):
try:
return value.encode(self.encoding)
except UnicodeEncodeError:
raise error.PyAsn1Error(
'Can\'t encode string \'%s\' with \'%s\' codec' % (value, OctetString): # a shortcut,bytes() would work the same way
return value.asOctets()
elif isinstance(value, base.AbstractSimpleAsn1Item): # this mostly targets Integer objects
return self.prettyIn(str(value))
elif isinstance(value, list)):
return self.prettyIn(bytes(value))
else:
return bytes(value)
def prettyOut(self, value):
if sys.version_info[0] <= 2:
numbers = tuple((ord(x) for x in value))
else:
numbers = tuple(value)
for x in numbers:
if x < 32 or x > 126:
return '0x' + ''.join(('%.2x' % x for x in numbers))
else:
try:
return value.decode(self.encoding)
except UnicodeDecodeError:
raise error.PyAsn1Error(
"Can't decode string '%s' with '%s' codec at '%s'" % (value, self.encoding, self.__class__.__name__)
)
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 getComponentByName(self, name):
"""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
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)
def _cloneComponentValues(self, cloneValueFlag):
try:
component = self.getComponent()
except error.PyAsn1Error:
pass
else:
if isinstance(component, Choice):
tagSet = component.effectiveTagSet
else:
tagSet = component.tagSet
if isinstance(component, component.clone(cloneValueFlag=cloneValueFlag)
)
else:
myClone.setComponentByType(tagSet, component.clone())
def getComponent(self, innerFlag=0):
"""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)
def tagExplicitly(self, superTag):
"""Return explicitly tagged *TagSet*
Create a new *TagSet* representing callee *TagSet* explicitly tagged
with passed tag(s). With explicit tagging mode,new tags are appended
to existing tag(s).
Parameters
----------
superTag: :class:`~pyasn1.type.tag.Tag`
*Tag* object to tag this *TagSet*
Returns
-------
: :class:`~pyasn1.type.tag.TagSet`
New *TagSet* object
"""
if superTag.tagClass == tagClassUniversal:
raise error.PyAsn1Error("Can't tag with UNIVERSAL class tag")
if superTag.tagFormat != tagFormatConstructed:
superTag = Tag(superTag.tagClass, tagFormatConstructed, superTag.tagId)
return self + superTag
def prettyIn(self, value):
try:
if isinstance(value, unicode):
return value
elif isinstance(value, str):
return value.decode(self.encoding)
elif isinstance(value, list)):
return self.prettyIn(''.join([chr(x) for x in value]))
elif isinstance(value, univ.OctetString):
return value.asOctets().decode(self.encoding)
else:
return unicode(value)
except (UnicodeDecodeError, LookupError):
raise error.PyAsn1Error(
"Can't decode string '%s' with codec %s" % (value, self.encoding)
)
def prettyIn(self, str):
return value
elif isinstance(value, bytes):
return value.decode(self.encoding)
elif isinstance(value, list)):
return self.prettyIn(bytes(value))
elif isinstance(value, univ.OctetString):
return value.asOctets().decode(self.encoding)
else:
return str(value)
except (UnicodeDecodeError, self.encoding)
)
def __new__(cls):
if cls._instance is None:
def getPlug(name):
def plug(self, *args, **kw):
raise error.PyAsn1Error('Uninitialized ASN.1 value ("%s" attribute looked up)' % 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 getTypeByPosition(self, idx):
"""Return ASN.1 type object by its position in fields set.
Parameters
----------
idx: :py:class:`int`
Field index
Returns
-------
:
ASN.1 type
Raises
------
: :class:`~pyasn1.error.PyAsn1Error`
If given position is out of fields range
"""
try:
return self.__namedTypes[idx].asn1Object
except IndexError:
raise error.PyAsn1Error('Type position out of range')
def getPositionByType(self, tagSet):
"""Return field position by its ASN.1 type.
Parameters
----------
tagSet: :class:`~pysnmp.type.tag.TagSet`
ASN.1 tag set distinguishing one ASN.1 type from others.
Returns
-------
: :py:class:`int`
ASN.1 type position in fields set
Raises
------
: :class:`~pyasn1.error.PyAsn1Error`
If *tagSet* is not present or ASN.1 types are not unique within callee *NamedTypes*
"""
try:
return self.__tagToPosMap[tagSet]
except KeyError:
raise error.PyAsn1Error('Type %s not found' % (tagSet,))
def getNameByPosition(self, idx):
"""Return field name by its position in fields set.
Parameters
----------
idx: :py:class:`idx`
Field index
Returns
-------
: :py:class:`str`
Field name
Raises
------
: :class:`~pyasn1.error.PyAsn1Error`
If given field name is not present in callee *NamedTypes*
"""
try:
return self.__namedTypes[idx].name
except IndexError:
raise error.PyAsn1Error('Type position out of range')
def getPositionByName(self, name):
"""Return field position by filed name.
Parameters
----------
name: :py:class:`str`
Field name
Returns
-------
: :py:class:`int`
Field position in fields set
Raises
------
: :class:`~pyasn1.error.PyAsn1Error`
If *name* is not present or not unique within callee *NamedTypes*
"""
try:
return self.__nametoPosMap[name]
except KeyError:
raise error.PyAsn1Error('Name %s not found' % (name,))
def valueDecoder(self,
tagSet=None, length=None, state=None,
decodeFun=None, substrateFun=None,
**options):
head, tail
# Todo: prohibit non-canonical encoding
def indefLenValueDecoder(self,
tagSet=None,
decodeFun=None,
**options):
if substrateFun:
return substrateFun(
self._createComponent(asn1Spec, ''),
substrate, length
)
value, **options)
eooMarker, allowEoo=True, **options)
if eooMarker is eoo.endOfOctets:
return value, substrate
else:
raise error.PyAsn1Error('Missing end-of-octets terminator')
def valueDecoder(self,
**options):
if tagSet[0].tagFormat != tag.tagFormatSimple:
raise error.PyAsn1Error('Simple tag format expected')
head, substrate[length:]
if not head:
return self._createComponent(asn1Spec, 0), tail
value = from_bytes(head, signed=True)
return self._createComponent(asn1Spec, tail
def valueDecoder(self, substrate[length:]
component = self._createComponent(asn1Spec, tagSet)
if head:
raise error.PyAsn1Error('Unexpected %d-octet substrate for Null' % length)
return component, tail
def prettyIn(self, str):
try:
return int(value)
except:
raise error.PyAsn1Error(
'Can\'t coerce %s into integer: %s' % (value, sys.exc_info()[1])
)
r = self.__namedValues.getValue(value)
if r is not None:
return r
try:
return int(value)
except:
raise error.PyAsn1Error(
'Can\'t coerce %s into integer: %s' % (value, sys.exc_info()[1])
)
def prettyIn(self, OctetString):
return value.asOctets()
elif isinstance(value, map)):
try:
return bytes(value)
except ValueError:
raise error.PyAsn1Error(
'Bad OctetString initializer \'%s\'' % (value,)
)
else:
try:
return str(value).encode(self._encoding)
except UnicodeEncodeError:
raise error.PyAsn1Error(
'Can\'t encode string \'%s\' with \'%s\' codec' % (value, self._encoding)
)
def indefLenValueDecoder(self, r.getComponentTagMap())
eooMarker, substrate = decodeFun(substrate) # eat up EOO marker
if not eoo.endOfOctets.isSameTypeWith(eooMarker) or \
eooMarker != eoo.endOfOctets:
raise error.PyAsn1Error('No EOO seen before substrate ends')
else:
component, substrate
def prettyIn(self, str):
try:
return value.encode(self._encoding)
except UnicodeEncodeError:
raise error.PyAsn1Error(
'Can\'t encode string \'%s\' with \'%s\' codec' % (value,)
)
else:
try:
return str(value).encode(self._encoding)
except UnicodeEncodeError:
raise error.PyAsn1Error(
'Can\'t encode string \'%s\' with \'%s\' codec' % (value, self._encoding)
)
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