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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 (
"crypto/ecdsa"
crand "crypto/rand"
"errors"
"sync"
"time"
"github.com/ethereum/go-ethereum/crypto"
)
var (
ErrLocked = errors.New("account is locked")
ErrNoKeys = errors.New("no keys in store")
)
type Account struct {
Address []byte
}
type AccountManager struct {
keyStore crypto.KeyStore2
unlockedKeys map[string]crypto.Key
unlockTime time.Duration
mutex sync.RWMutex
}
func NewAccountManager(keyStore crypto.KeyStore2, unlockTime time.Duration) *AccountManager {
return &AccountManager{
keyStore: keyStore,
unlockedKeys: make(map[string]crypto.Key),
unlockTime: unlockTime,
}
}
// Coinbase returns the account address that mining rewards are sent to.
func (am *AccountManager) Coinbase() (addr []byte, err error) {
// TODO: persist coinbase address on disk
return am.firstAddr()
}
// MainAccount returns the primary account used for transactions.
func (am *AccountManager) Default() (Account, error) {
// TODO: persist main account address on disk
addr, err := am.firstAddr()
return Account{Address: addr}, err
}
func (am *AccountManager) firstAddr() ([]byte, error) {
addrs, err := am.keyStore.GetKeyAddresses()
if err != nil {
return nil, err
}
if len(addrs) == 0 {
return nil, ErrNoKeys
}
return addrs[0], nil
}
func (am *AccountManager) DeleteAccount(address []byte, auth string) error {
return am.keyStore.DeleteKey(address, auth)
}
func (am *AccountManager) Sign(a Account, toSign []byte) (signature []byte, err error) {
am.mutex.RLock()
unlockedKey := am.unlockedKeys[string(a.Address)]
am.mutex.RUnlock()
if unlockedKey.Address == nil {
return nil, ErrLocked
}
signature, err = crypto.Sign(toSign, unlockedKey.PrivateKey)
return signature, err
}
func (am *AccountManager) SignLocked(a Account, keyAuth string, toSign []byte) (signature []byte, err error) {
key, err := am.keyStore.GetKey(a.Address, keyAuth)
if err != nil {
return nil, err
}
am.mutex.RLock()
am.unlockedKeys[string(a.Address)] = *key
am.mutex.RUnlock()
go unlockLater(am, a.Address)
signature, err = crypto.Sign(toSign, key.PrivateKey)
return signature, err
}
func (am *AccountManager) NewAccount(auth string) (Account, error) {
key, err := am.keyStore.GenerateNewKey(crand.Reader, auth)
if err != nil {
return Account{}, err
}
return Account{Address: key.Address}, nil
}
func (am *AccountManager) Accounts() ([]Account, error) {
addresses, err := am.keyStore.GetKeyAddresses()
if err != nil {
return nil, err
}
accounts := make([]Account, len(addresses))
for i, addr := range addresses {
accounts[i] = Account{
Address: addr,
}
}
return accounts, err
}
func unlockLater(am *AccountManager, addr []byte) {
select {
case <-time.After(am.unlockTime):
}
am.mutex.RLock()
// TODO: how do we know the key is actually gone from memory?
delete(am.unlockedKeys, string(addr))
am.mutex.RUnlock()
}
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