def _verifyComponent(self, idx, value, **kwargs):
componentType = self._componentType
if componentType:
if idx >= len(componentType):
raise PyAsn1Error('Component type error out of range')
t = componentType[idx].getType()
if not t.getTagSet().isSuperTagSetOf(value.getTagSet()):
raise PyAsn1Error('Component type error %r vs %r' % (t, value))
def clone(self, value=univ.noValue, **kwargs):
"""Clone this instance.
If *value* is specified, use its tag as the component type selector,
and itself as the component value.
:param value: (Optional) the component value.
:type value: :py:obj:`pyasn1.type.base.Asn1ItemBase`
:return: the cloned instance.
:rtype: :py:obj:`pysnmp.proto.rfc1155.NetworkAddress`
:raise: :py:obj:`pysnmp.smi.error.SmiError`:
if the type of *value* is not allowed for this Choice instance.
"""
cloned = univ.Choice.clone(self, **kwargs)
if value is not univ.noValue:
if isinstance(value, NetworkAddress):
value = value.getComponent()
elif not isinstance(value, IpAddress):
# IpAddress is the only supported type, perhaps forever because
# this is SNMPv1.
value = IpAddress(value)
try:
tagSet = value.tagSet
except AttributeError:
raise PyAsn1Error('component value %r has no tag set' % (value,))
cloned.setComponentByType(tagSet, value)
return cloned
def _decodeASN1String(rdnNameAttrValue):
""" Tries to decode a string encoded with the following type:
* UTF8String
* PrintableString
* IA5String
This utility function is needed for 2 reasons:
* Not all the attributes are encoded the same way, and as we do not want to bother
with zillions of `if` conditions, we may just as well try
* It seems like the RFCs are not always respected, and the encoding is not always the correct one
http://www.oid-info.com/ is a very good source of information for looking up the type of
a specific OID
:param rdnNameAttrValue: the value part of rfc3280.AttributeTypeAndValue
:returns: the decoded value or raises PyAsn1Error if nothing worked
"""
for decodeType in (asn1char.UTF8String, asn1char.PrintableString,
asn1char.IA5String):
try:
attrValStr, _rest = der_decode(rdnNameAttrValue, decodeType())
# Decoding error, try the next type
except PyAsn1Error:
pass
else:
# If the decoding worked, return it
return attrValStr
raise PyAsn1Error("Could not find a correct decoding type")
def require_component(asn1_obj, component_ident, val_type=None):
val = get_component(asn1_obj, component_ident)
if val.isValue:
return _cast_value(val, val_type)
else:
raise PyAsn1Error(
f'Required component {component_ident} is not set to a value')
def _decodeASN1String(rdnNameAttrValue):
"""Tries to decode a string encoded with the following type:
* BMPString
* IA5String
* PrintableString
* TeletexString
* UTF8String
Most of these types come from the definition of the issuer field in RFC3280:
* The basic attributes, defined as DirectoryString (4.1.2.4 Issuer)
* the optional attributes (Appendix A. Psuedo-ASN.1 Structures and OIDs)
This utility function is needed for 2 reasons:
* Not all the attributes are encoded the same way, and as we do not want to bother
with zillions of `if` conditions, we may just as well try
* It seems like the RFCs are not always respected, and the encoding is not always the correct one
http://www.oid-info.com/ is a very good source of information for looking up the type of
a specific OID
:param rdnNameAttrValue: the value part of rfc3280.AttributeTypeAndValue
:returns: the decoded value or raises PyAsn1Error if nothing worked
"""
for decodeType in (
asn1char.UTF8String,
asn1char.PrintableString,
asn1char.IA5String,
asn1char.TeletexString,
asn1char.BMPString,
):
try:
attrValStr, _rest = der_decode(rdnNameAttrValue, decodeType())
# Decoding error, try the next type
except PyAsn1Error:
pass
else:
# If the decoding worked, return it
return attrValStr
raise PyAsn1Error("Could not find a correct decoding type")
