path: root/accounts/account_manager.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"
    "github.com/ethereum/go-ethereum/crypto"
)

// TODO: better name for this struct?
type Account struct {
    Address []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(fromAccount *Account, keyAuth string, toSign []byte) (signature []byte, err error) {
    key, err := am.keyStore.GetKey(fromAccount.Address, keyAuth)
    if err != nil {
        return nil, err
    }
    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
}

// set of accounts == set of keys in given key store
// TODO: do we need persistence of accounts as well?
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
}