133 lines
3.5 KiB
Go
133 lines
3.5 KiB
Go
/*
|
|
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"
|
|
|
|
"errors"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/crypto"
|
|
)
|
|
|
|
var ErrLocked = errors.New("account is locked; please request passphrase")
|
|
|
|
// TODO: better name for this struct?
|
|
type Account struct {
|
|
Address []byte
|
|
}
|
|
|
|
type AccountManager struct {
|
|
keyStore crypto.KeyStore2
|
|
unlockedKeys map[string]crypto.Key
|
|
unlockMilliseconds time.Duration
|
|
mutex sync.RWMutex
|
|
}
|
|
|
|
func NewAccountManager(keyStore crypto.KeyStore2, unlockMilliseconds time.Duration) AccountManager {
|
|
keysMap := make(map[string]crypto.Key)
|
|
am := &AccountManager{
|
|
keyStore: keyStore,
|
|
unlockedKeys: keysMap,
|
|
unlockMilliseconds: unlockMilliseconds,
|
|
}
|
|
return *am
|
|
}
|
|
|
|
func (am AccountManager) DeleteAccount(address []byte, auth string) error {
|
|
return am.keyStore.DeleteKey(address, auth)
|
|
}
|
|
|
|
func (am *AccountManager) Sign(fromAccount *Account, toSign []byte) (signature []byte, err error) {
|
|
am.mutex.RLock()
|
|
unlockedKey := am.unlockedKeys[string(fromAccount.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(fromAccount *Account, keyAuth string, toSign []byte) (signature []byte, err error) {
|
|
key, err := am.keyStore.GetKey(fromAccount.Address, keyAuth)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
am.mutex.RLock()
|
|
am.unlockedKeys[string(fromAccount.Address)] = *key
|
|
am.mutex.RUnlock()
|
|
go unlockLater(am, fromAccount.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 nil, err
|
|
}
|
|
ua := &Account{
|
|
Address: key.Address,
|
|
}
|
|
return ua, err
|
|
}
|
|
|
|
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(time.Millisecond * am.unlockMilliseconds):
|
|
}
|
|
am.mutex.RLock()
|
|
// TODO: how do we know the key is actually gone from memory?
|
|
delete(am.unlockedKeys, string(addr))
|
|
am.mutex.RUnlock()
|
|
}
|