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143 lines
4 KiB
Go
143 lines
4 KiB
Go
// Copyright 2018 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library 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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//
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// The go-ethereum library 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 Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package storage
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import (
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"encoding/json"
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"io/ioutil"
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"os"
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"github.com/ethereum/go-ethereum/log"
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)
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// FileStorageAPI is a storage type which is backed by a json-file.
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type FileStorageAPI struct {
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// File to read/write credentials
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filename string
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}
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// Put stores a value by key. 0-length keys results in noop.
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func (s *FileStorageAPI) Put(key, value string) error {
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if len(key) == 0 {
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return ErrZeroKey
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}
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data, err := s.readStorage()
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if err != nil {
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log.Warn("Failed to read encrypted storage", "err", err, "file", s.filename)
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return err
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}
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data[key] = value
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if err = s.writeStorage(data); err != nil {
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log.Warn("Failed to write entry", "err", err)
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return err
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}
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return nil
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}
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// Get returns the previously stored value, or an error if it does not exist or
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// key is of 0-length.
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func (s *FileStorageAPI) Get(key string) (string, error) {
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if len(key) == 0 {
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return "", ErrZeroKey
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}
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data, err := s.readStorage()
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if err != nil {
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log.Warn("Failed to read encrypted storage", "err", err, "file", s.filename)
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return "", err
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}
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value, exist := data[key]
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if !exist {
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log.Warn("Key does not exist", "key", key)
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return "", ErrNotFound
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}
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return value, nil
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}
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// Del removes a key-value pair. If the key doesn't exist, the method is a noop.
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func (s *FileStorageAPI) Del(key string) {
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data, err := s.readStorage()
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if err != nil {
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log.Warn("Failed to read encrypted storage", "err", err, "file", s.filename)
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return
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}
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delete(data, key)
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if err = s.writeStorage(data); err != nil {
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log.Warn("Failed to write entry", "err", err)
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}
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}
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// readEncryptedStorage reads the file with encrypted creds
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// func (s *FileStorageAPI) readEncryptedStorage() (map[string]StoredCredential, error) {
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// creds := make(map[string]StoredCredential)
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// raw, err := ioutil.ReadFile(s.filename)
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// if err != nil {
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// if os.IsNotExist(err) {
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// // Doesn't exist yet
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// return creds, nil
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// }
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// log.Warn("Failed to read encrypted storage", "err", err, "file", s.filename)
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// }
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// if err = json.Unmarshal(raw, &creds); err != nil {
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// log.Warn("Failed to unmarshal encrypted storage", "err", err, "file", s.filename)
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// return nil, err
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// }
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// return creds, nil
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// }
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// readStorage reads the file with encrypted creds and return them as is
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func (s *FileStorageAPI) readStorage() (map[string]string, error) {
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creds := make(map[string]string)
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raw, err := ioutil.ReadFile(s.filename)
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if err != nil {
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if os.IsNotExist(err) {
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// Doesn't exist yet
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return creds, nil
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}
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log.Warn("Failed to read file storage", "err", err, "file", s.filename)
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}
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if err = json.Unmarshal(raw, &creds); err != nil {
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log.Warn("Failed to unmarshal file storage", "err", err, "file", s.filename)
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return nil, err
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}
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return creds, nil
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}
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// writeEncryptedStorage write the file with encrypted creds
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// func (s *FileStorageAPI) writeEncryptedStorage(creds map[string]StoredCredential) error {
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// raw, err := json.Marshal(creds)
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// if err != nil {
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// return err
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// }
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// if err = ioutil.WriteFile(s.filename, raw, 0600); err != nil {
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// return err
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// }
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// return nil
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// }
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func (s *FileStorageAPI) writeStorage(creds map[string]string) error {
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raw, err := json.Marshal(creds)
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if err != nil {
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return err
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}
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if err = ioutil.WriteFile(s.filename, raw, 0600); err != nil {
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return err
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}
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return nil
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}
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