feat: Babbage era 'Utxo' validation rules (#930)

Fixes #879

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

Author: agaffney

ledger/allegra/rules.go

@@ -111,16 +111,7 @@ func UtxoValidateValueNotConservedUtxo(
 	ls common.LedgerState,
 	pp common.ProtocolParameters,
 ) error {
-	tmpPparams, ok := pp.(*AllegraProtocolParameters)
-	if !ok {
-		return errors.New("pparams are not expected type")
-	}
-	return shelley.UtxoValidateValueNotConservedUtxo(
-		tx,
-		slot,
-		ls,
-		&tmpPparams.ShelleyProtocolParameters,
-	)
+	return shelley.UtxoValidateValueNotConservedUtxo(tx, slot, ls, pp)
 }
 
 func UtxoValidateOutputTooSmallUtxo(

ledger/alonzo/rules.go

@@ -192,16 +192,13 @@ func UtxoValidateNoCollateralInputs(tx common.Transaction, slot uint64, ls commo
 	}
 	return NoCollateralInputsError{}
 }
+
 func UtxoValidateBadInputsUtxo(tx common.Transaction, slot uint64, ls common.LedgerState, pp common.ProtocolParameters) error {
 	return shelley.UtxoValidateBadInputsUtxo(tx, slot, ls, pp)
 }
 
 func UtxoValidateValueNotConservedUtxo(tx common.Transaction, slot uint64, ls common.LedgerState, pp common.ProtocolParameters) error {
-	tmpPparams, ok := pp.(*AlonzoProtocolParameters)
-	if !ok {
-		return errors.New("pparams are not expected type")
-	}
-	return shelley.UtxoValidateValueNotConservedUtxo(tx, slot, ls, &tmpPparams.ShelleyProtocolParameters)
+	return shelley.UtxoValidateValueNotConservedUtxo(tx, slot, ls, pp)
 }
 
 func UtxoValidateOutputTooSmallUtxo(tx common.Transaction, slot uint64, ls common.LedgerState, pp common.ProtocolParameters) error {

ledger/babbage/errors.go

@@ -0,0 +1,60 @@
+// Copyright 2025 Blink Labs Software
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package babbage
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/blinklabs-io/gouroboros/ledger/common"
+)
+
+type NonDisjointRefInputsError struct {
+	Inputs []common.TransactionInput
+}
+
+func (e NonDisjointRefInputsError) Error() string {
+	tmpInputs := make([]string, 0, len(e.Inputs))
+	for idx, tmpInput := range e.Inputs {
+		tmpInputs[idx] = tmpInput.String()
+	}
+	return "non-disjoint reference inputs: " + strings.Join(tmpInputs, ", ")
+}
+
+type TooManyCollateralInputsError struct {
+	Provided uint
+	Max      uint
+}
+
+func (e TooManyCollateralInputsError) Error() string {
+	return fmt.Sprintf(
+		"too many collateral inputs: provided %d, maximum %d",
+		e.Provided,
+		e.Max,
+	)
+}
+
+type IncorrectTotalCollateralFieldError struct {
+	Provided        uint64
+	TotalCollateral uint64
+}
+
+func (e IncorrectTotalCollateralFieldError) Error() string {
+	return fmt.Sprintf(
+		"incorrect total collateral field: provided %d, total collateral %d",
+		e.Provided,
+		e.TotalCollateral,
+	)
+}