forked from mintme-com/webchaind
/
auth.go
64 lines (57 loc) · 2.03 KB
/
auth.go
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// Copyright 2016 The go-ethereum Authors
// This file is part of Webchain.
//
// Webchain 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.
//
// Webchain 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 Webchain. If not, see <http://www.gnu.org/licenses/>.
package bind
import (
"crypto/ecdsa"
"errors"
"io"
"io/ioutil"
"github.com/webchain-network/webchaind/accounts"
"github.com/webchain-network/webchaind/common"
"github.com/webchain-network/webchaind/core/types"
"github.com/webchain-network/webchaind/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 := accounts.Web3PrivateKey(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 single private key.
func NewKeyedTransactor(key *ecdsa.PrivateKey) *TransactOpts {
keyAddr := crypto.PubkeyToAddress(key.PublicKey)
return &TransactOpts{
From: keyAddr,
Signer: func(signer types.Signer, address common.Address, tx *types.Transaction) (*types.Transaction, error) {
if address != keyAddr {
return nil, errors.New("not authorized to sign this account")
}
signature, err := crypto.Sign(signer.Hash(tx).Bytes(), key)
if err != nil {
return nil, err
}
return tx.WithSigner(signer).WithSignature(signature)
},
}
}