Fix witness deser

pycardano/witness.py

@@ -8,17 +8,11 @@
 from pycardano.key import ExtendedVerificationKey, VerificationKey
 from pycardano.nativescript import NativeScript
 from pycardano.plutus import (
-    ExecutionUnits,
     PlutusV1Script,
     PlutusV2Script,
     PlutusV3Script,
     RawPlutusData,
-    Redeemer,
-    RedeemerKey,
-    RedeemerMap,
     Redeemers,
-    RedeemerTag,
-    RedeemerValue,
 )
 from pycardano.serialization import (
     ArrayCBORSerializable,
@@ -94,62 +88,3 @@ class TransactionWitnessSet(MapCBORSerializable):
     plutus_v3_script: Optional[List[PlutusV3Script]] = field(
         default=None, metadata={"optional": True, "key": 7}
     )
-
-    @classmethod
-    @limit_primitive_type(dict, list)
-    def from_primitive(
-        cls: Type[TransactionWitnessSet], values: Union[dict, list, tuple]
-    ) -> TransactionWitnessSet | None:
-        def _get_vkey_witnesses(data: Any):
-            return (
-                [VerificationKeyWitness.from_primitive(witness) for witness in data]
-                if data
-                else None
-            )
-
-        def _get_native_scripts(data: Any):
-            return (
-                [NativeScript.from_primitive(script) for script in data]
-                if data
-                else None
-            )
-
-        def _get_plutus_v1_scripts(data: Any):
-            return [PlutusV1Script(script) for script in data] if data else None
-
-        def _get_plutus_v2_scripts(data: Any):
-            return [PlutusV2Script(script) for script in data] if data else None
-
-        def _get_redeemers(data: Any):
-            if not data:
-                return None
-            if isinstance(data, dict):
-                redeemer_map = RedeemerMap()
-                for (tag, index), value in data.items():
-                    key = RedeemerKey(RedeemerTag(tag), index)
-                    redeemer_value = RedeemerValue(value[0], ExecutionUnits(*value[1]))
-                    redeemer_map[key] = redeemer_value
-                return redeemer_map
-            elif isinstance(data, list):
-                return [Redeemer.from_primitive(redeemer) for redeemer in data]
-            else:
-                raise ValueError(f"Unexpected redeemer data format: {type(data)}")
-
-        def _get_cls(data: Any):
-            return cls(
-                vkey_witnesses=_get_vkey_witnesses(data.get(0)),
-                native_scripts=_get_native_scripts(data.get(1)),
-                bootstrap_witness=data.get(2),
-                plutus_v1_script=_get_plutus_v1_scripts(data.get(3)),
-                plutus_data=data.get(4),
-                redeemer=_get_redeemers(data.get(5)),
-                plutus_v2_script=_get_plutus_v2_scripts(data.get(6)),
-            )
-
-        if isinstance(values, dict):
-            return _get_cls(values)
-        elif isinstance(values, list):
-            # TODO: May need to handle this differently
-            values = dict(values)
-            return _get_cls(values)
-        return None

test/pycardano/test_plutus.py

@@ -9,6 +9,7 @@
 import pytest
 from cbor2 import CBORTag
 
+from pycardano import TransactionWitnessSet
 from pycardano.exception import DeserializeException
 from pycardano.plutus import (
     COST_MODELS,
@@ -584,3 +585,11 @@ def test_redeemer_map():
     assert deserialized[key1].ex_units == value1.ex_units
     assert deserialized[key2].data == value2.data
     assert deserialized[key2].ex_units == value2.ex_units
+
+
+def test_empty_map_deser():
+    empty_map = RedeemerMap()
+    witness = TransactionWitnessSet(redeemer=empty_map)
+    serialized = witness.to_primitive()
+    deserialized = TransactionWitnessSet.from_primitive(serialized)
+    assert deserialized.redeemer == empty_map