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/*
This file is part of go-ethereum
go-ethereum 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.
go-ethereum 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 General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @authors
* Gustav Simonsson <gustav.simonsson@gmail.com>
* @date 2015
*
*/
/*
This abstracts part of a user's interaction with an account she controls.
It's not an abstraction of core Ethereum accounts data type / logic -
for that see the core processing code of blocks / txs.
Currently this is pretty much a passthrough to the KeyStore2 interface,
and accounts persistence is derived from stored keys' addresses
*/
package accounts
import (
crand "crypto/rand"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/crypto/secp256k1"
)
// TODO: better name for this struct?
type UserAccount struct {
Addr []byte
}
type AccountManager struct {
keyStore crypto.KeyStore2
}
// TODO: get key by addr - modify KeyStore2 GetKey to work with addr
// TODO: pass through passphrase for APIs which require access to private key?
func NewAccountManager(keyStore crypto.KeyStore2) AccountManager {
am := &AccountManager{
keyStore: keyStore,
}
return *am
}
func (am *AccountManager) Sign(fromAddr []byte, keyAuth string, toSign []byte) (signature []byte, err error) {
key, err := am.keyStore.GetKey(fromAddr, keyAuth)
if err != nil {
return nil, err
}
privKey := crypto.FromECDSA(key.PrivateKey)
// TODO: what is second value?
signature, err = secp256k1.Sign(toSign, privKey)
return signature, err
}
func (am AccountManager) NewAccount(auth string) (*UserAccount, error) {
key, err := am.keyStore.GenerateNewKey(crand.Reader, auth)
if err != nil {
return nil, err
}
ua := &UserAccount{
Addr: key.Address,
}
return ua, err
}
// set of accounts == set of keys in given key store
// TODO: do we need persistence of accounts as well?
func (am *AccountManager) Accounts() ([]UserAccount, error) {
addresses, err := am.keyStore.GetKeyAddresses()
if err != nil {
return nil, err
}
accounts := make([]UserAccount, len(addresses))
for i, addr := range addresses {
ua := &UserAccount{
Addr: addr,
}
accounts[i] = *ua
}
return accounts, err
}
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