Preserve set-code auth list in external signer

accounts/external/backend.go

@@ -198,6 +198,19 @@ type signTransactionResult struct {
 // by the external signer. For non-legacy transactions, the chain ID of the
 // transaction overrides the chainID parameter.
 func (api *ExternalSigner) SignTx(account accounts.Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) {
+	args, err := signTxArgs(account, tx, chainID)
+	if err != nil {
+		return nil, err
+	}
+
+	var res signTransactionResult
+	if err := api.client.Call(&res, "account_signTransaction", args); err != nil {
+		return nil, err
+	}
+	return res.Tx, nil
+}
+
+func signTxArgs(account accounts.Account, tx *types.Transaction, chainID *big.Int) (*apitypes.SendTxArgs, error) {
 	data := hexutil.Bytes(tx.Data())
 	var to *common.MixedcaseAddress
 	if tx.To() != nil {
@@ -215,9 +228,13 @@ func (api *ExternalSigner) SignTx(account accounts.Account, tx *types.Transactio
 	switch tx.Type() {
 	case types.LegacyTxType, types.AccessListTxType:
 		args.GasPrice = (*hexutil.Big)(tx.GasPrice())
-	case types.DynamicFeeTxType, types.BlobTxType, types.SetCodeTxType:
+	case types.DynamicFeeTxType, types.BlobTxType:
 		args.MaxFeePerGas = (*hexutil.Big)(tx.GasFeeCap())
 		args.MaxPriorityFeePerGas = (*hexutil.Big)(tx.GasTipCap())
+	case types.SetCodeTxType:
+		args.MaxFeePerGas = (*hexutil.Big)(tx.GasFeeCap())
+		args.MaxPriorityFeePerGas = (*hexutil.Big)(tx.GasTipCap())
+		args.AuthorizationList = tx.SetCodeAuthorizations()
 	default:
 		return nil, fmt.Errorf("unsupported tx type %d", tx.Type())
 	}
@@ -246,12 +263,7 @@ func (api *ExternalSigner) SignTx(account accounts.Account, tx *types.Transactio
 		args.Commitments = sidecar.Commitments
 		args.Proofs = sidecar.Proofs
 	}
-
-	var res signTransactionResult
-	if err := api.client.Call(&res, "account_signTransaction", args); err != nil {
-		return nil, err
-	}
-	return res.Tx, nil
+	return args, nil
 }
 
 func (api *ExternalSigner) SignTextWithPassphrase(account accounts.Account, passphrase string, text []byte) ([]byte, error) {

accounts/external/backend_test.go

@@ -0,0 +1,81 @@
+// Copyright 2026 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+// for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package external
+
+import (
+	"bytes"
+	"encoding/json"
+	"math/big"
+	"reflect"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/accounts"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/holiman/uint256"
+)
+
+func TestSignTxArgsSetCodeAuthorizationList(t *testing.T) {
+	account := accounts.Account{Address: common.HexToAddress("0x1000000000000000000000000000000000000001")}
+	to := common.HexToAddress("0x2000000000000000000000000000000000000002")
+	auth := types.SetCodeAuthorization{
+		ChainID: *uint256.NewInt(5),
+		Address: common.HexToAddress("0x3000000000000000000000000000000000000003"),
+		Nonce:   9,
+		V:       1,
+		R:       *uint256.NewInt(10),
+		S:       *uint256.NewInt(11),
+	}
+	tx := types.NewTx(&types.SetCodeTx{
+		ChainID:   uint256.NewInt(5),
+		Nonce:     4,
+		GasTipCap: uint256.NewInt(3),
+		GasFeeCap: uint256.NewInt(30),
+		Gas:       21000,
+		To:        to,
+		Value:     uint256.NewInt(7),
+		Data:      []byte{0x01, 0x02},
+		AccessList: types.AccessList{{
+			Address:     common.HexToAddress("0x4000000000000000000000000000000000000004"),
+			StorageKeys: []common.Hash{common.HexToHash("0x01")},
+		}},
+		AuthList: []types.SetCodeAuthorization{auth},
+	})
+	args, err := signTxArgs(account, tx, big.NewInt(1))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if args.ChainID == nil || (*big.Int)(args.ChainID).Cmp(big.NewInt(5)) != 0 {
+		t.Fatalf("have chain id %v, want 5", args.ChainID)
+	}
+	if args.MaxFeePerGas == nil || (*big.Int)(args.MaxFeePerGas).Cmp(big.NewInt(30)) != 0 {
+		t.Fatalf("have max fee %v, want 30", args.MaxFeePerGas)
+	}
+	if args.MaxPriorityFeePerGas == nil || (*big.Int)(args.MaxPriorityFeePerGas).Cmp(big.NewInt(3)) != 0 {
+		t.Fatalf("have max priority fee %v, want 3", args.MaxPriorityFeePerGas)
+	}
+	if !reflect.DeepEqual(args.AuthorizationList, []types.SetCodeAuthorization{auth}) {
+		t.Fatalf("have auth list %#v, want %#v", args.AuthorizationList, []types.SetCodeAuthorization{auth})
+	}
+	blob, err := json.Marshal(args)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Contains(blob, []byte(`"authorizationList"`)) {
+		t.Fatalf("marshaled args missing authorizationList: %s", blob)
+	}
+}

signer/core/apitypes/types.go

@@ -112,6 +112,9 @@ type SendTxArgs struct {
 	Blobs       []kzg4844.Blob       `json:"blobs,omitempty"`
 	Commitments []kzg4844.Commitment `json:"commitments,omitempty"`
 	Proofs      []kzg4844.Proof      `json:"proofs,omitempty"`
+
+	// For SetCodeTxType
+	AuthorizationList []types.SetCodeAuthorization `json:"authorizationList,omitempty"`
 }
 
 func (args SendTxArgs) String() string {
@@ -146,6 +149,27 @@ func (args *SendTxArgs) ToTransaction() (*types.Transaction, error) {
 	}
 	var data types.TxData
 	switch {
+	case args.AuthorizationList != nil:
+		al := types.AccessList{}
+		if args.AccessList != nil {
+			al = *args.AccessList
+		}
+		if to == nil {
+			return nil, errors.New("transaction recipient must be set for set-code transactions")
+		}
+		data = &types.SetCodeTx{
+			To:         *to,
+			ChainID:    uint256.MustFromBig((*big.Int)(args.ChainID)),
+			Nonce:      uint64(args.Nonce),
+			Gas:        uint64(args.Gas),
+			GasFeeCap:  uint256.MustFromBig((*big.Int)(args.MaxFeePerGas)),
+			GasTipCap:  uint256.MustFromBig((*big.Int)(args.MaxPriorityFeePerGas)),
+			Value:      uint256.MustFromBig((*big.Int)(&args.Value)),
+			Data:       args.data(),
+			AccessList: al,
+			AuthList:   args.AuthorizationList,
+		}
+
 	case args.BlobHashes != nil:
 		al := types.AccessList{}
 		if args.AccessList != nil {

signer/core/apitypes/types_test.go

@@ -17,12 +17,16 @@
 package apitypes
 
 import (
+	"bytes"
 	"crypto/rand"
 	"crypto/sha256"
 	"encoding/json"
+	"math/big"
+	"reflect"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto/kzg4844"
 	"github.com/holiman/uint256"
@@ -99,6 +103,75 @@ func TestTxArgs(t *testing.T) {
 	}
 }
 
+func TestSetCodeTxArgs(t *testing.T) {
+	to := common.HexToAddress("0x1000000000000000000000000000000000000001")
+	from := common.NewMixedcaseAddress(common.HexToAddress("0x9000000000000000000000000000000000000009"))
+	mixedTo := common.NewMixedcaseAddress(to)
+	input := hexutil.Bytes{0x01, 0x02}
+	chainID := hexutil.Big(*big.NewInt(5))
+	maxFee := hexutil.Big(*big.NewInt(30))
+	maxTip := hexutil.Big(*big.NewInt(3))
+	value := hexutil.Big(*big.NewInt(7))
+	accessList := types.AccessList{{
+		Address:     common.HexToAddress("0x2000000000000000000000000000000000000002"),
+		StorageKeys: []common.Hash{common.HexToHash("0x01")},
+	}}
+	auth := types.SetCodeAuthorization{
+		ChainID: *uint256.NewInt(5),
+		Address: common.HexToAddress("0x3000000000000000000000000000000000000003"),
+		Nonce:   9,
+		V:       1,
+		R:       *uint256.NewInt(10),
+		S:       *uint256.NewInt(11),
+	}
+	args := SendTxArgs{
+		From:                 from,
+		To:                   &mixedTo,
+		Gas:                  21000,
+		MaxFeePerGas:         &maxFee,
+		MaxPriorityFeePerGas: &maxTip,
+		Value:                value,
+		Nonce:                4,
+		Input:                &input,
+		AccessList:           &accessList,
+		ChainID:              &chainID,
+		AuthorizationList:    []types.SetCodeAuthorization{auth},
+	}
+	blob, err := json.Marshal(args)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Contains(blob, []byte(`"authorizationList"`)) {
+		t.Fatalf("marshaled args missing authorizationList: %s", blob)
+	}
+	var decoded SendTxArgs
+	if err := json.Unmarshal(blob, &decoded); err != nil {
+		t.Fatal(err)
+	}
+	tx, err := decoded.ToTransaction()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if have, want := tx.Type(), uint8(types.SetCodeTxType); have != want {
+		t.Fatalf("have tx type %d, want %d", have, want)
+	}
+	if have := tx.To(); have == nil || *have != to {
+		t.Fatalf("have to %v, want %v", have, to)
+	}
+	if have, want := tx.ChainId(), big.NewInt(5); have.Cmp(want) != 0 {
+		t.Fatalf("have chain id %v, want %v", have, want)
+	}
+	if !bytes.Equal(tx.Data(), input) {
+		t.Fatalf("have input %x, want %x", tx.Data(), input)
+	}
+	if !reflect.DeepEqual(tx.AccessList(), accessList) {
+		t.Fatalf("have access list %#v, want %#v", tx.AccessList(), accessList)
+	}
+	if !reflect.DeepEqual(tx.SetCodeAuthorizations(), []types.SetCodeAuthorization{auth}) {
+		t.Fatalf("have auth list %#v, want %#v", tx.SetCodeAuthorizations(), []types.SetCodeAuthorization{auth})
+	}
+}
+
 func TestBlobTxs(t *testing.T) {
 	blob := kzg4844.Blob{0x1}
 	commitment, err := kzg4844.BlobToCommitment(&blob)