157 lines
3.9 KiB
Go
157 lines
3.9 KiB
Go
/*
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This file is part of go-ethereum
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go-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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go-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @authors
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* Gustav Simonsson <gustav.simonsson@gmail.com>
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* @date 2015
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*
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*/
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/*
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This abstracts part of a user's interaction with an account she controls.
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It's not an abstraction of core Ethereum accounts data type / logic -
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for that see the core processing code of blocks / txs.
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Currently this is pretty much a passthrough to the KeyStore2 interface,
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and accounts persistence is derived from stored keys' addresses
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*/
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package accounts
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import (
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"crypto/ecdsa"
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crand "crypto/rand"
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"errors"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/crypto"
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)
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var (
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ErrLocked = errors.New("account is locked")
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ErrNoKeys = errors.New("no keys in store")
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)
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type Account struct {
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Address []byte
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}
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type AccountManager struct {
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keyStore crypto.KeyStore2
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unlockedKeys map[string]crypto.Key
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unlockTime time.Duration
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mutex sync.RWMutex
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}
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func NewAccountManager(keyStore crypto.KeyStore2, unlockTime time.Duration) *AccountManager {
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return &AccountManager{
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keyStore: keyStore,
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unlockedKeys: make(map[string]crypto.Key),
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unlockTime: unlockTime,
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}
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}
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// Coinbase returns the account address that mining rewards are sent to.
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func (am *AccountManager) Coinbase() (addr []byte, err error) {
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// TODO: persist coinbase address on disk
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return am.firstAddr()
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}
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// MainAccount returns the primary account used for transactions.
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func (am *AccountManager) Default() (Account, error) {
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// TODO: persist main account address on disk
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addr, err := am.firstAddr()
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return Account{Address: addr}, err
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}
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func (am *AccountManager) firstAddr() ([]byte, error) {
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addrs, err := am.keyStore.GetKeyAddresses()
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if err != nil {
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return nil, err
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}
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if len(addrs) == 0 {
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return nil, ErrNoKeys
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}
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return addrs[0], nil
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}
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func (am *AccountManager) DeleteAccount(address []byte, auth string) error {
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return am.keyStore.DeleteKey(address, auth)
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}
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func (am *AccountManager) Sign(a Account, toSign []byte) (signature []byte, err error) {
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am.mutex.RLock()
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unlockedKey := am.unlockedKeys[string(a.Address)]
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am.mutex.RUnlock()
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if unlockedKey.Address == nil {
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return nil, ErrLocked
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}
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signature, err = crypto.Sign(toSign, unlockedKey.PrivateKey)
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return signature, err
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}
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func (am *AccountManager) SignLocked(a Account, keyAuth string, toSign []byte) (signature []byte, err error) {
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key, err := am.keyStore.GetKey(a.Address, keyAuth)
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if err != nil {
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return nil, err
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}
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am.mutex.Lock()
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am.unlockedKeys[string(a.Address)] = *key
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am.mutex.Unlock()
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go unlockLater(am, a.Address)
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signature, err = crypto.Sign(toSign, key.PrivateKey)
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return signature, err
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}
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func (am *AccountManager) NewAccount(auth string) (Account, error) {
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key, err := am.keyStore.GenerateNewKey(crand.Reader, auth)
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if err != nil {
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return Account{}, err
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}
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return Account{Address: key.Address}, nil
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}
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func (am *AccountManager) Accounts() ([]Account, error) {
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addresses, err := am.keyStore.GetKeyAddresses()
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if err != nil {
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return nil, err
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}
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accounts := make([]Account, len(addresses))
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for i, addr := range addresses {
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accounts[i] = Account{
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Address: addr,
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}
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}
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return accounts, err
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}
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func unlockLater(am *AccountManager, addr []byte) {
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select {
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case <-time.After(am.unlockTime):
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}
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am.mutex.Lock()
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// TODO: how do we know the key is actually gone from memory?
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delete(am.unlockedKeys, string(addr))
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am.mutex.Unlock()
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}
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}
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