From 313018496f6b5cb442749d10bc071dc15f6bc550 Mon Sep 17 00:00:00 2001
From: Daniel Liu <liudaniel@qq.com>
Date: Tue, 14 Jan 2025 10:56:09 +0800
Subject: [PATCH] accounts: added transactorFromKeyStore (#19685)

---
 accounts/abi/bind/auth.go | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/accounts/abi/bind/auth.go b/accounts/abi/bind/auth.go
index a53aeef366..b661a29f4d 100644
--- a/accounts/abi/bind/auth.go
+++ b/accounts/abi/bind/auth.go
@@ -53,6 +53,25 @@ func NewTransactor(keyin io.Reader, passphrase string) (*TransactOpts, error) {
 	return NewKeyedTransactor(key.PrivateKey), nil
 }
 
+// NewTransactor is a utility method to easily create a transaction signer from
+// an decrypted key from a keystore
+func NewTransactorFromKeyStore(keystore *keystore.KeyStore, account accounts.Account) (*TransactOpts, error) {
+	signer := types.HomesteadSigner{}
+	return &TransactOpts{
+		From: account.Address,
+		Signer: func(address common.Address, tx *types.Transaction) (*types.Transaction, error) {
+			if address != account.Address {
+				return nil, errors.New("not authorized to sign this account")
+			}
+			signature, err := keystore.SignHash(account, signer.Hash(tx).Bytes())
+			if err != nil {
+				return nil, err
+			}
+			return tx.WithSignature(signer, signature)
+		},
+	}, nil
+}
+
 // NewKeyedTransactor is a utility method to easily create a transaction signer
 // from a single private key.
 //