/
service.go
168 lines (143 loc) · 3.55 KB
/
service.go
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package file
import (
"crypto/ecdsa"
"fmt"
"os"
"path/filepath"
"time"
"github.com/FavorLabs/favorX/pkg/crypto"
)
// Service is the file-based keystore.Service implementation.
//
// Keys are stored in directory where each private key is stored in a file,
// which is encrypted with symmetric key using some password.
type Service struct {
dir string
}
// New creates new file-based keystore.Service implementation.
func New(dir string) *Service {
return &Service{dir: dir}
}
func (s *Service) Exists(name string) (bool, error) {
filename := s.keyFilename(name)
data, err := os.ReadFile(filename)
if err != nil && !os.IsNotExist(err) {
return false, fmt.Errorf("read private key: %w", err)
}
if len(data) == 0 {
return false, nil
}
return true, nil
}
func (s *Service) Key(name, password string) (pk *ecdsa.PrivateKey, created bool, err error) {
filename := s.keyFilename(name)
data, err := os.ReadFile(filename)
if err != nil && !os.IsNotExist(err) {
return nil, false, fmt.Errorf("read private key: %w", err)
}
if len(data) == 0 {
var err error
pk, err = crypto.GenerateSecp256k1Key()
if err != nil {
return nil, false, fmt.Errorf("generate secp256k1 key: %w", err)
}
d, err := encryptKey(pk, password)
if err != nil {
return nil, false, err
}
if err := os.MkdirAll(filepath.Dir(filename), 0700); err != nil {
return nil, false, err
}
if err := os.WriteFile(filename, d, 0600); err != nil {
return nil, false, err
}
return pk, true, nil
}
pk, err = decryptKey(data, password)
if err != nil {
return nil, false, err
}
return pk, false, nil
}
func (s *Service) ExportKey(name, password string) ([]byte, error) {
pk, err := s.read(name, password)
if err != nil {
return nil, err
}
return encryptKey(pk, password)
}
func (s *Service) ImportKey(name, password string, keyJson []byte) (err error) {
_, err = s.read(name, password)
if err != nil {
return err
}
bakFile, err := s.bak(name)
if err != nil {
return err
}
defer func() {
if err != nil {
_ = s.restore(name, bakFile)
}
}()
pk, err := decryptKey(keyJson, password)
if err != nil {
return err
}
d, err := encryptKey(pk, password)
if err != nil {
return err
}
return s.write(name, d)
}
func (s *Service) ImportPrivateKey(name, password string, pk *ecdsa.PrivateKey) (err error) {
_, err = s.read(name, password)
if err != nil {
return err
}
bakFile, err := s.bak(name)
if err != nil {
return err
}
defer func() {
if err != nil {
_ = s.restore(name, bakFile)
}
}()
d, err := encryptKey(pk, password)
if err != nil {
return err
}
return s.write(name, d)
}
func (s *Service) keyFilename(name string) string {
return filepath.Join(s.dir, fmt.Sprintf("%s.key", name))
}
func (s *Service) read(name, password string) (pk *ecdsa.PrivateKey, err error) {
filename := s.keyFilename(name)
data, err := os.ReadFile(filename)
if err != nil {
return nil, fmt.Errorf("read private key failed")
}
return decryptKey(data, password)
}
func (s *Service) write(name string, data []byte) (err error) {
filename := s.keyFilename(name)
if err = os.MkdirAll(filepath.Dir(filename), 0700); err != nil {
return err
}
if err = os.WriteFile(filename, data, 0600); err != nil {
return err
}
return nil
}
func (s *Service) bak(name string) (bakFile string, err error) {
filename := s.keyFilename(name)
bakFile = filename + fmt.Sprintf(".bak.%d", time.Now().Unix())
err = os.Rename(filename, bakFile)
return
}
func (s *Service) restore(name, bakFile string) error {
filename := s.keyFilename(name)
return os.Rename(bakFile, filename)
}