feat: TX script data hash attribute (#632)

This adds a method for retrieving the script data hash from a TX

Fixes #337

Author: agaffney

ledger/allegra.go

@@ -186,6 +186,10 @@ func (t AllegraTransaction) AssetMint() *MultiAsset[MultiAssetTypeMint] {
 	return t.Body.AssetMint()
 }
 
+func (t AllegraTransaction) ScriptDataHash() *Blake2b256 {
+	return t.Body.ScriptDataHash()
+}
+
 func (t AllegraTransaction) VotingProcedures() VotingProcedures {
 	return t.Body.VotingProcedures()
 }

ledger/alonzo.go

@@ -128,7 +128,7 @@ type AlonzoTransactionBody struct {
 		ProtocolParamUpdates map[Blake2b224]AlonzoProtocolParameterUpdate
 		Epoch                uint64
 	} `cbor:"6,keyasint,omitempty"`
-	ScriptDataHash    Blake2b256                `cbor:"11,keyasint,omitempty"`
+	TxScriptDataHash  *Blake2b256               `cbor:"11,keyasint,omitempty"`
 	TxCollateral      []ShelleyTransactionInput `cbor:"13,keyasint,omitempty"`
 	TxRequiredSigners []Blake2b224              `cbor:"14,keyasint,omitempty"`
 	NetworkId         uint8                     `cbor:"15,keyasint,omitempty"`
@@ -159,6 +159,10 @@ func (b *AlonzoTransactionBody) RequiredSigners() []Blake2b224 {
 	return b.TxRequiredSigners[:]
 }
 
+func (b *AlonzoTransactionBody) ScriptDataHash() *Blake2b256 {
+	return b.TxScriptDataHash
+}
+
 type AlonzoTransactionOutput struct {
 	cbor.StructAsArray
 	cbor.DecodeStoreCbor
@@ -300,6 +304,10 @@ func (t AlonzoTransaction) AssetMint() *MultiAsset[MultiAssetTypeMint] {
 	return t.Body.AssetMint()
 }
 
+func (t AlonzoTransaction) ScriptDataHash() *Blake2b256 {
+	return t.Body.ScriptDataHash()
+}
+
 func (t AlonzoTransaction) VotingProcedures() VotingProcedures {
 	return t.Body.VotingProcedures()
 }

ledger/babbage.go

@@ -464,6 +464,10 @@ func (t BabbageTransaction) Withdrawals() map[*Address]uint64 {
 	return t.Body.Withdrawals()
 }
 
+func (t BabbageTransaction) ScriptDataHash() *Blake2b256 {
+	return t.Body.ScriptDataHash()
+}
+
 func (t BabbageTransaction) VotingProcedures() VotingProcedures {
 	return t.Body.VotingProcedures()
 }

ledger/byron.go

@@ -210,6 +210,11 @@ func (t *ByronTransaction) AssetMint() *MultiAsset[MultiAssetTypeMint] {
 	return nil
 }
 
+func (t *ByronTransaction) ScriptDataHash() *Blake2b256 {
+	// No script data hash in Byron
+	return nil
+}
+
 func (t *ByronTransaction) VotingProcedures() VotingProcedures {
 	// No voting procedures in Byron
 	return nil

ledger/conway.go

@@ -377,6 +377,10 @@ func (t ConwayTransaction) AssetMint() *MultiAsset[MultiAssetTypeMint] {
 	return t.Body.AssetMint()
 }
 
+func (t ConwayTransaction) ScriptDataHash() *Blake2b256 {
+	return t.Body.ScriptDataHash()
+}
+
 func (t ConwayTransaction) VotingProcedures() VotingProcedures {
 	return t.Body.VotingProcedures()
 }

ledger/mary.go

@@ -207,6 +207,10 @@ func (t MaryTransaction) AssetMint() *MultiAsset[MultiAssetTypeMint] {
 	return t.Body.AssetMint()
 }
 
+func (t MaryTransaction) ScriptDataHash() *Blake2b256 {
+	return t.Body.ScriptDataHash()
+}
+
 func (t MaryTransaction) VotingProcedures() VotingProcedures {
 	return t.Body.VotingProcedures()
 }

ledger/shelley.go

@@ -254,12 +254,17 @@ func (b *ShelleyTransactionBody) AssetMint() *MultiAsset[MultiAssetTypeMint] {
 	return nil
 }
 
-func (t *ShelleyTransactionBody) VotingProcedures() VotingProcedures {
+func (b *ShelleyTransactionBody) ScriptDataHash() *Blake2b256 {
+	// No script data hash in Shelley
+	return nil
+}
+
+func (b *ShelleyTransactionBody) VotingProcedures() VotingProcedures {
 	// No voting procedures in Shelley
 	return nil
 }
 
-func (t *ShelleyTransactionBody) ProposalProcedures() []ProposalProcedure {
+func (b *ShelleyTransactionBody) ProposalProcedures() []ProposalProcedure {
 	// No proposal procedures in Shelley
 	return nil
 }
@@ -430,6 +435,10 @@ func (t ShelleyTransaction) AssetMint() *MultiAsset[MultiAssetTypeMint] {
 	return t.Body.AssetMint()
 }
 
+func (t ShelleyTransaction) ScriptDataHash() *Blake2b256 {
+	return t.Body.ScriptDataHash()
+}
+
 func (t ShelleyTransaction) VotingProcedures() VotingProcedures {
 	return t.Body.VotingProcedures()
 }

ledger/tx.go

@@ -48,6 +48,7 @@ type TransactionBody interface {
 	Withdrawals() map[*Address]uint64
 	RequiredSigners() []Blake2b224
 	AssetMint() *MultiAsset[MultiAssetTypeMint]
+	ScriptDataHash() *Blake2b256
 	VotingProcedures() VotingProcedures
 	ProposalProcedures() []ProposalProcedure
 	Utxorpc() *utxorpc.Tx