feat: Waku v2 bridge

Issue #12610

vendor/github.com/wealdtech/go-ens/v3/util/signer.go

@@ -0,0 +1,51 @@
+// Copyright 2018 Weald Technology Ltd
+//
+// 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 util
+
+import (
+	"crypto/ecdsa"
+	"errors"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/accounts"
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+// KeySigner generates a signer using a private key
+func KeySigner(chainID *big.Int, key *ecdsa.PrivateKey) (signerfn bind.SignerFn) {
+	signerfn = func(address common.Address, tx *types.Transaction) (*types.Transaction, error) {
+		keyAddr := crypto.PubkeyToAddress(key.PublicKey)
+		if address != keyAddr {
+			return nil, errors.New("not authorized to sign this account")
+		}
+		return types.SignTx(tx, types.NewEIP155Signer(chainID), key)
+	}
+
+	return
+}
+
+// AccountSigner generates a signer using an account
+func AccountSigner(chainID *big.Int, wallet *accounts.Wallet, account *accounts.Account, passphrase string) (signerfn bind.SignerFn) {
+	signerfn = func(address common.Address, tx *types.Transaction) (*types.Transaction, error) {
+		if address != account.Address {
+			return nil, errors.New("not authorized to sign this account")
+		}
+		return (*wallet).SignTxWithPassphrase(*account, passphrase, tx, chainID)
+	}
+	return
+}