evm/accounts/abi/bind/auth.go

// (c) 2020-2020, Lux Industries, Inc.
//
// This file is a derived work, based on the go-ethereum library whose original
// notices appear below.
//
// It is distributed under a license compatible with the licensing terms of the
// original code from which it is derived.
//
// Much love to the original authors for their work.
// **********
// Copyright 2016 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 bind

import (
	"context"
	"crypto/ecdsa"
	"errors"
	"io"
	"math/big"
	"github.com/luxfi/geth/accounts"
	"github.com/luxfi/geth/accounts/external"
	"github.com/luxfi/geth/accounts/keystore"
	"github.com/luxfi/evm/core/types"
	ethtypes "github.com/luxfi/geth/core/types"
	"github.com/luxfi/geth/common"
	"github.com/luxfi/geth/crypto"
	"github.com/luxfi/log"
)

// ErrNoChainID is returned whenever the user failed to specify a chain id.
var ErrNoChainID = errors.New("no chain id specified")

// ErrNotAuthorized is returned when an account is not properly unlocked.
var ErrNotAuthorized = errors.New("not authorized to sign this account")

// NewTransactor is a utility method to easily create a transaction signer from
// an encrypted json key stream and the associated passphrase.
//
// Deprecated: Use NewTransactorWithChainID instead.
func NewTransactor(keyin io.Reader, passphrase string) (*TransactOpts, error) {
	log.Warn("WARNING: NewTransactor has been deprecated in favour of NewTransactorWithChainID")
	json, err := io.ReadAll(keyin)
	if err != nil {
		return nil, err
	}
	key, err := keystore.DecryptKey(json, passphrase)
	if err != nil {
		return nil, err
	}
	return NewKeyedTransactor(key.PrivateKey), nil
}

// NewKeyStoreTransactor is a utility method to easily create a transaction signer from
// a decrypted key from a keystore.
//
// Deprecated: Use NewKeyStoreTransactorWithChainID instead.
func NewKeyStoreTransactor(keystore *keystore.KeyStore, account accounts.Account) (*TransactOpts, error) {
	log.Warn("WARNING: NewKeyStoreTransactor has been deprecated in favour of NewTransactorWithChainID")
	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, ErrNotAuthorized
			}
			signature, err := keystore.SignHash(account, signer.Hash(tx).Bytes())
			if err != nil {
				return nil, err
			}
			return tx.WithSignature(signer, signature)
		},
		Context: context.Background(),
	}, nil
}

// NewKeyedTransactor is a utility method to easily create a transaction signer
// from a single private key.
//
// Deprecated: Use NewKeyedTransactorWithChainID instead.
func NewKeyedTransactor(key *ecdsa.PrivateKey) *TransactOpts {
	log.Warn("WARNING: NewKeyedTransactor has been deprecated in favour of NewKeyedTransactorWithChainID")
	keyAddr := crypto.PubkeyToAddress(key.PublicKey)
	signer := types.HomesteadSigner{}
	return &TransactOpts{
		From: keyAddr,
		Signer: func(address common.Address, tx *types.Transaction) (*types.Transaction, error) {
			if address != keyAddr {
				return nil, ErrNotAuthorized
			}
			signature, err := crypto.Sign(signer.Hash(tx).Bytes(), key)
			if err != nil {
				return nil, err
			}
			return tx.WithSignature(signer, signature)
		},
		Context: context.Background(),
	}
}

// NewTransactorWithChainID is a utility method to easily create a transaction signer from
// an encrypted json key stream and the associated passphrase.
func NewTransactorWithChainID(keyin io.Reader, passphrase string, chainID *big.Int) (*TransactOpts, error) {
	json, err := io.ReadAll(keyin)
	if err != nil {
		return nil, err
	}
	key, err := keystore.DecryptKey(json, passphrase)
	if err != nil {
		return nil, err
	}
	return NewKeyedTransactorWithChainID(key.PrivateKey, chainID)
}

// NewKeyStoreTransactorWithChainID is a utility method to easily create a transaction signer from
// a decrypted key from a keystore.
func NewKeyStoreTransactorWithChainID(keystore *keystore.KeyStore, account accounts.Account, chainID *big.Int) (*TransactOpts, error) {
	if chainID == nil {
		return nil, ErrNoChainID
	}
	signer := types.LatestSignerForChainID(chainID)
	return &TransactOpts{
		From: account.Address,
		Signer: func(address common.Address, tx *types.Transaction) (*types.Transaction, error) {
			if address != account.Address {
				return nil, ErrNotAuthorized
			}
			signature, err := keystore.SignHash(account, signer.Hash(tx).Bytes())
			if err != nil {
				return nil, err
			}
			return tx.WithSignature(signer, signature)
		},
		Context: context.Background(),
	}, nil
}

// NewKeyedTransactorWithChainID is a utility method to easily create a transaction signer
// from a single private key.
func NewKeyedTransactorWithChainID(key *ecdsa.PrivateKey, chainID *big.Int) (*TransactOpts, error) {
	keyAddr := crypto.PubkeyToAddress(key.PublicKey)
	if chainID == nil {
		return nil, ErrNoChainID
	}
	signer := types.LatestSignerForChainID(chainID)
	return &TransactOpts{
		From: keyAddr,
		Signer: func(address common.Address, tx *types.Transaction) (*types.Transaction, error) {
			if address != keyAddr {
				return nil, ErrNotAuthorized
			}
			signature, err := crypto.Sign(signer.Hash(tx).Bytes(), key)
			if err != nil {
				return nil, err
			}
			return tx.WithSignature(signer, signature)
		},
		Context: context.Background(),
	}, nil
}

// NewClefTransactor is a utility method to easily create a transaction signer
// with a clef backend.
func NewClefTransactor(clef *external.ExternalSigner, account accounts.Account) *TransactOpts {
	return &TransactOpts{
		From: account.Address,
		Signer: func(address common.Address, transaction *types.Transaction) (*types.Transaction, error) {
			if address != account.Address {
				return nil, ErrNotAuthorized
			}
			// Convert EVM transaction to geth transaction for signing
			// Create a geth transaction for clef signing
			gethTx := ethtypes.NewTx(&ethtypes.LegacyTx{
				Nonce:    transaction.Nonce(),
				GasPrice: transaction.GasPrice(),
				Gas:      transaction.Gas(),
				To:       transaction.To(),
				Value:    transaction.Value(),
				Data:     transaction.Data(),
			})
			signedGethTx, err := clef.SignTx(account, gethTx, nil) // Clef enforces its own chain id
			if err != nil {
				return nil, err
			}
			// Get signature values from signed transaction
			v, r, s := signedGethTx.RawSignatureValues()
			
			// Convert back to EVM transaction
			return types.NewTx(&types.LegacyTx{
				Nonce:    signedGethTx.Nonce(),
				GasPrice: signedGethTx.GasPrice(),
				Gas:      signedGethTx.Gas(),
				To:       signedGethTx.To(),
				Value:    signedGethTx.Value(),
				Data:     signedGethTx.Data(),
				V:        v,
				R:        r,
				S:        s,
			}), nil
		},
		Context: context.Background(),
	}
}