Fix plutus script deserialization (#293)

* Added extended signing key support for cip8

* Fixed unused imports, flake8 checks pass.

* Fixed mypy error for overloaded variable

* Remove extraneous parameter for verify

* Added ByteString to _restored_typed_primitive

* Added type checking

* Fixed bug where script inputs for transactions could not be deserialized

* Stronger assumption in test for script serialization

---------

Co-authored-by: Niels Mündler <[email protected]>

Author: theeldermillenial

pycardano/serialization.py

@@ -536,6 +536,11 @@ def _restore_typed_primitive(
         if not isinstance(v, bytes):
             raise DeserializeException(f"Expected type bytes but got {type(v)}")
         return ByteString(v)
+    elif isclass(t) and t.__name__ in ["PlutusV1Script", "PlutusV2Script"]:
+        if not isinstance(v, bytes):
+            raise DeserializeException(f"Expected type bytes but got {type(v)}")
+        return t(v)
+
     elif isclass(t) and issubclass(t, IndefiniteList):
         try:
             return IndefiniteList(v)

test/pycardano/test_plutus.py

@@ -12,17 +12,17 @@
 from pycardano.exception import DeserializeException
 from pycardano.plutus import (
     COST_MODELS,
+    Datum,
     ExecutionUnits,
     PlutusData,
     RawPlutusData,
     Redeemer,
     RedeemerTag,
-    plutus_script_hash,
-    id_map,
-    Datum,
     Unit,
+    id_map,
+    plutus_script_hash,
 )
-from pycardano.serialization import IndefiniteList, RawCBOR, ByteString
+from pycardano.serialization import ByteString, IndefiniteList, RawCBOR
 
 
 @dataclass

test/pycardano/test_serialization.py

@@ -7,6 +7,7 @@
 
 from pycardano import Datum, RawPlutusData
 from pycardano.exception import DeserializeException
+from pycardano.plutus import PlutusV1Script, PlutusV2Script
 from pycardano.serialization import (
     ArrayCBORSerializable,
     CBORSerializable,
@@ -286,3 +287,17 @@ class Test2(MapCBORSerializable):
 
     with pytest.raises(TypeError):
         Test2(a=Test1(a=1)).to_cbor_hex()
+
+
+def test_script_deserialize():
+    @dataclass
+    class Test(MapCBORSerializable):
+        script_1: PlutusV1Script
+        script_2: PlutusV2Script
+
+    datum = Test(
+        script_1=PlutusV1Script(b"dummy test script"),
+        script_2=PlutusV2Script(b"dummy test script"),
+    )
+
+    assert datum == datum.from_cbor(datum.to_cbor())