[389-devel] [lib389] Deref control advice needed

[Rich Megginson]

On 08/26/2015 03:28 AM, William Brown wrote:
>> In relation to ticket 47757, I have started work on a deref control for
>> Noriko.
>> The idea is to get it working in lib389, then get it upstreamed into pyldap.
>>
>> At this point it's all done, except that the actual request control doesn't
>> appear to work. Could one of the lib389 / ldap python experts cast their eye
>> over this and let me know where I've gone wrong?
> I have improved this, but am having issues with the asn1spec for ber decoding.
>
> I have attached the updated patch, but specifically the issue is in _controls.py
>
> I would appreciate if anyone could take a look at this, and let me know if there
> is something I have missed.

Not sure, but here is some code I did without using pyasn:
https://github.com/richm/scripts/blob/master/derefctrl.py
This is quite old by now, and is probably bit rotted with respect to 
python-ldap and python3.

>
> """
>   controlValue ::= SEQUENCE OF derefRes DerefRes
>
>   DerefRes ::= SEQUENCE {
>       derefAttr       AttributeDescription,
>       derefVal        LDAPDN,
>       attrVals        [0] PartialAttributeList OPTIONAL }
>
>   PartialAttributeList ::= SEQUENCE OF
>                  partialAttribute PartialAttribute
> """
>
> class DerefRes(univ.Sequence):
>      componentType = namedtype.NamedTypes(
>          namedtype.NamedType('derefAttr', AttributeDescription()),
>          namedtype.NamedType('derefVal', LDAPDN()),
>          namedtype.OptionalNamedType('attrVals', PartialAttributeList()),
>      )
>
> class DerefResultControlValue(univ.SequenceOf):
>      componentType = DerefRes()
>
>
> ....
>
>
>      def decodeControlValue(self,encodedControlValue):
>          self.entry = {}
>          #decodedValue,_ =
> decoder.decode(encodedControlValue,asn1Spec=DerefResultControlValue())
>          # Gets the error: TagSet(Tag(tagClass=0, tagFormat=32, tagId=16),
> Tag(tagClass=128, tagFormat=32, tagId=0)) not in asn1Spec:
> {TagSet(Tag(tagClass=0, tagFormat=32, tagId=16)): PartialAttributeList()}/{}
>          decodedValue,_ = decoder.decode(encodedControlValue)
>          print(decodedValue.prettyPrint())
>          # Pretty print yields
>          #Sequence:  <-- Sequence of
>          # <no-name>=Sequence:  <-- derefRes
>          #  <no-name>=uniqueMember <-- derefAttr
>          #  <no-name>=uid=test,dc=example,dc=com <-- derefVal
>          #  <no-name>=Sequence: <-- attrVals
>          #   <no-name>=uid
>          #   <no-name>=Set:
>          #    <no-name>=test
>          # For now, while asn1spec is sad, we'll just rely on it being well
> formed
>          # However, this isn't good, as without the asn1spec, we seem to actually
> be dropping values ....
>          for result in decodedValue:
>              derefAttr, derefVal, _ = result
>              self.entry[str(derefAttr)] = str(derefVal)
>
>
>
> --
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> 389-devel at lists.fedoraproject.org
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