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file.go
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file.go
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// Copyright (C) 2023 Gobalsky Labs Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package paths
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
vgcrypto "code.vegaprotocol.io/vega/libs/crypto"
vgfs "code.vegaprotocol.io/vega/libs/fs"
"github.com/BurntSushi/toml"
)
var (
ErrEmptyResponse = errors.New("empty response")
ErrEmptyFile = errors.New("empty file")
ErrContentLooksLikeHTML = errors.New("the content looks like it contains HTML, be sure your file has TOML formatting")
ErrContentLooksLikeJSON = errors.New("the content looks like it contains JSON, be sure your file has TOML formatting")
)
func FetchStructuredFile(url string, v interface{}) error {
resp, err := http.Get(url) //nolint:noctx
if err != nil {
return fmt.Errorf("couldn't load file: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return errors.New(http.StatusText(resp.StatusCode))
}
body, err := io.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("couldn't read HTTP response body: %w", err)
}
if len(body) == 0 {
return ErrEmptyResponse
}
if err := decodeTOMLFile(body, v); err != nil {
return err
}
return nil
}
func decodeTOMLFile(content []byte, v interface{}) error {
if content[0] == '<' {
return ErrContentLooksLikeHTML
}
if content[0] == '{' {
return ErrContentLooksLikeJSON
}
if _, err := toml.Decode(string(content), v); err != nil {
return fmt.Errorf("invalid TOML document: %w", err)
}
return nil
}
func ReadStructuredFile(path string, v interface{}) error {
buf, err := vgfs.ReadFile(path)
if err != nil {
return fmt.Errorf("couldn't read file: %w", err)
}
if len(buf) == 0 {
return ErrEmptyFile
}
if err := decodeTOMLFile(buf, v); err != nil {
return err
}
return nil
}
func WriteStructuredFile(path string, v interface{}) error {
buf := new(bytes.Buffer)
if err := toml.NewEncoder(buf).Encode(v); err != nil {
return fmt.Errorf("couldn't encode to TOML: %w", err)
}
if err := vgfs.WriteFile(path, buf.Bytes()); err != nil {
return fmt.Errorf("couldn't write file: %w", err)
}
return nil
}
func ReadEncryptedFile(path string, passphrase string, v interface{}) error {
encryptedBuf, err := vgfs.ReadFile(path)
if err != nil {
return fmt.Errorf("couldn't read secure file: %w", err)
}
if len(encryptedBuf) == 0 {
return ErrEmptyFile
}
buf, err := vgcrypto.Decrypt(encryptedBuf, passphrase)
if err != nil {
return fmt.Errorf("couldn't decrypt content: %w", err)
}
err = json.Unmarshal(buf, v)
if err != nil {
return fmt.Errorf("couldn't unmarshal content: %w", err)
}
return nil
}
func WriteEncryptedFile(path string, passphrase string, v interface{}) error {
buf, err := json.Marshal(v)
if err != nil {
return fmt.Errorf("couldn't marshal content: %w", err)
}
encryptedBuf, err := vgcrypto.Encrypt(buf, passphrase)
if err != nil {
return fmt.Errorf("couldn't encrypt content: %w", err)
}
if err := vgfs.WriteFile(path, encryptedBuf); err != nil {
return fmt.Errorf("couldn't write secure file: %w", err)
}
return nil
}