package crypto
import (
"fmt"
"sync"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/logger"
)
var keylogger = logger.NewLogger("KEY")
type KeyManager struct {
keyRing *KeyRing
session string
keyStore KeyStore // interface
keyRings map[string]*KeyRing // cache
keyPair *KeyPair
}
func NewDBKeyManager(db ethutil.Database) *KeyManager {
return &KeyManager{keyStore: &DBKeyStore{db: db}, keyRings: make(map[string]*KeyRing)}
}
func NewFileKeyManager(basedir string) *KeyManager {
return &KeyManager{keyStore: &FileKeyStore{basedir: basedir}, keyRings: make(map[string]*KeyRing)}
}
func (k *KeyManager) KeyPair() *KeyPair {
return k.keyPair
}
func (k *KeyManager) KeyRing() *KeyPair {
return k.keyPair
}
func (k *KeyManager) PrivateKey() []byte {
return k.keyPair.PrivateKey
}
func (k *KeyManager) PublicKey() []byte {
return k.keyPair.PublicKey
}
func (k *KeyManager) Address() []byte {
return k.keyPair.Address()
}
func (k *KeyManager) save(session string, keyRing *KeyRing) error {
err := k.keyStore.Save(session, keyRing)
if err != nil {
return err
}
k.keyRings[session] = keyRing
return nil
}
func (k *KeyManager) load(session string) (*KeyRing, error) {
keyRing, found := k.keyRings[session]
if !found {
var err error
keyRing, err = k.keyStore.Load(session)
if err != nil {
return nil, err
}
}
return keyRing, nil
}
func cursorError(cursor int, len int) error {
return fmt.Errorf("cursor %d out of range (0..%d)", cursor, len)
}
func (k *KeyManager) reset(session string, cursor int, keyRing *KeyRing) error {
if cursor >= keyRing.Len() {
return cursorError(cursor, keyRing.Len())
}
lock := &sync.Mutex{}
lock.Lock()
defer lock.Unlock()
err := k.save(session, keyRing)
if err != nil {
return err
}
k.session = session
k.keyRing = keyRing
k.keyPair = keyRing.GetKeyPair(cursor)
return nil
}
func (k *KeyManager) SetCursor(cursor int) error {
if cursor >= k.keyRing.Len() {
return cursorError(cursor, k.keyRing.Len())
}
k.keyPair = k.keyRing.GetKeyPair(cursor)
return nil
}
func (k *KeyManager) Init(session string, cursor int, force bool) error {
var keyRing *KeyRing
if !force {
var err error
keyRing, err = k.load(session)
if err != nil {
return err
}
}
if keyRing == nil {
keyRing = NewGeneratedKeyRing(1)
keylogger.Infof("Created keypair. Private key: %x\n", keyRing.keys[0].PrivateKey)
}
return k.reset(session, cursor, keyRing)
}
func (k *KeyManager) InitFromSecretsFile(session string, cursor int, secretsfile string) error {
keyRing, err := NewKeyRingFromFile(secretsfile)
if err != nil {
return err
}
return k.reset(session, cursor, keyRing)
}
func (k *KeyManager) InitFromString(session string, cursor int, secrets string) error {
keyRing, err := NewKeyRingFromString(secrets)
if err != nil {
return err
}
return k.reset(session, cursor, keyRing)
}
func (k *KeyManager) Export(dir string) error {
fileKeyStore := FileKeyStore{dir}
return fileKeyStore.Save(k.session, k.keyRing)
}
