fix: script ref CBOR marshaling (#1150)

Fixes #1149

Signed-off-by: Aurora Gaffney <[email protected]>

Author: agaffney

ledger/common/script.go

@@ -82,6 +82,22 @@ func (s *ScriptRef) UnmarshalCBOR(data []byte) error {
 	return nil
 }
 
+func (s *ScriptRef) MarshalCBOR() ([]byte, error) {
+	tmpData := []any{
+		s.Type,
+		s.Script,
+	}
+	tmpDataCbor, err := cbor.Encode(tmpData)
+	if err != nil {
+		return nil, err
+	}
+	tmpTag := cbor.Tag{
+		Number:  24,
+		Content: tmpDataCbor,
+	}
+	return cbor.Encode(tmpTag)
+}
+
 type PlutusV1Script []byte
 
 func (PlutusV1Script) isScript() {}

ledger/common/script_test.go

@@ -23,9 +23,10 @@ import (
 	"github.com/blinklabs-io/gouroboros/ledger/common"
 )
 
-func TestScriptRefDecode(t *testing.T) {
+func TestScriptRefDecodeEncode(t *testing.T) {
 	// 24_0(<<[3, h'480123456789abcdef']>>)
-	testCbor, _ := hex.DecodeString("d8184c820349480123456789abcdef")
+	testCborHex := "d8184c820349480123456789abcdef"
+	testCbor, _ := hex.DecodeString(testCborHex)
 	scriptCbor, _ := hex.DecodeString("480123456789abcdef")
 	expectedScript := common.PlutusV3Script(scriptCbor)
 	var testScriptRef common.ScriptRef
@@ -39,6 +40,13 @@ func TestScriptRefDecode(t *testing.T) {
 			&expectedScript,
 		)
 	}
+	scriptRefCbor, err := cbor.Encode(testScriptRef)
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	if hex.EncodeToString(scriptRefCbor) != testCborHex {
+		t.Fatalf("did not get expected CBOR\n     got: %x\n  wanted: %s", scriptRefCbor, testCborHex)
+	}
 }
 
 func TestNativeScriptHash(t *testing.T) {