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// 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 (
"errors"
"io"
"io/ioutil"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
)
// NewTransactor is a utility method to easily create a transaction signer from
// an encrypted json key stream and the associated passphrase.
func NewTransactor(keyin io.Reader, passphrase string) (*TransactOpts, error) {
json, err := ioutil.ReadAll(keyin)
if err != nil {
return nil, err
}
key, err := crypto.DecryptKey(json, passphrase)
if err != nil {
return nil, err
}
return NewKeyedTransactor(key), nil
}
// NewKeyedTransactor is a utility method to easily create a transaction signer
// from a plain go-ethereum crypto key.
func NewKeyedTransactor(key *crypto.Key) *TransactOpts {
return &TransactOpts{
From: key.Address,
Signer: func(address common.Address, tx *types.Transaction) (*types.Transaction, error) {
if address != key.Address {
return nil, errors.New("not authorized to sign this account")
}
signature, err := crypto.Sign(tx.SigHash().Bytes(), key.PrivateKey)
if err != nil {
return nil, err
}
return tx.WithSignature(signature)
},
}
}
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