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file.go
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file.go
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package core
import (
"encoding/json"
"encoding/pem"
"io/ioutil"
"os"
"path/filepath"
"time"
"github.com/pelletier/go-toml"
)
// OpenFile method opens the file from given path - does not close the file
func OpenFile(relativePath string) (*os.File, error) {
path, err := filepath.Abs(relativePath)
if err != nil {
log.Warn("cannot create absolute path for the provided file", "error", err.Error())
return nil, err
}
f, err := os.Open(filepath.Clean(path))
if err != nil {
return nil, err
}
return f, nil
}
// LoadTomlFile method to open and decode toml file
func LoadTomlFile(dest interface{}, relativePath string) error {
f, err := OpenFile(relativePath)
if err != nil {
return err
}
defer func() {
err = f.Close()
if err != nil {
log.Warn("cannot close file", "error", err.Error())
}
}()
return toml.NewDecoder(f).Decode(dest)
}
// LoadTomlFileToMap opens and decodes a toml file as a map[string]interface{}
func LoadTomlFileToMap(relativePath string) (map[string]interface{}, error) {
f, err := OpenFile(relativePath)
if err != nil {
return nil, err
}
fileinfo, err := f.Stat()
if err != nil {
log.Error("cannot stat file:", err.Error())
return nil, err
}
filesize := fileinfo.Size()
buffer := make([]byte, filesize)
_, err = f.Read(buffer)
if err != nil {
log.Error("cannot read from file:", err.Error())
return nil, err
}
defer func() {
err = f.Close()
if err != nil {
log.Error("cannot close file: ", err.Error())
}
}()
loadedTree, err := toml.Load(string(buffer))
if err != nil {
log.Error("cannot interpret file contents as toml:", err.Error())
return nil, err
}
loadedMap := loadedTree.ToMap()
return loadedMap, nil
}
// LoadJsonFile method to open and decode json file
func LoadJsonFile(dest interface{}, relativePath string) error {
f, err := OpenFile(relativePath)
if err != nil {
return err
}
defer func() {
err = f.Close()
if err != nil {
log.Warn("cannot close file", "error", err.Error())
}
}()
return json.NewDecoder(f).Decode(dest)
}
// CreateFile opens or creates a file relative to the default path
func CreateFile(prefix string, subfolder string, fileExtension string) (*os.File, error) {
absPath, err := filepath.Abs(subfolder)
if err != nil {
return nil, err
}
err = os.MkdirAll(absPath, os.ModePerm)
if err != nil {
return nil, err
}
fileName := time.Now().Format("2006-02-01-15-04-05")
if prefix != "" {
fileName = prefix + "-" + fileName
}
return os.OpenFile(
filepath.Join(absPath, fileName+"."+fileExtension),
os.O_CREATE|os.O_APPEND|os.O_WRONLY,
FileModeUserReadWrite)
}
// LoadSkFromPemFile loads the secret key bytes stored in the file
func LoadSkFromPemFile(relativePath string, skIndex int) ([]byte, error) {
if skIndex < 0 {
return nil, ErrInvalidIndex
}
file, err := OpenFile(relativePath)
if err != nil {
return nil, err
}
defer func() {
cerr := file.Close()
log.LogIfError(cerr)
}()
buff, err := ioutil.ReadAll(file)
if err != nil {
return nil, err
}
if len(buff) == 0 {
return nil, ErrEmptyFile
}
var blkRecovered *pem.Block
for i := 0; i <= skIndex; i++ {
if len(buff) == 0 {
//less private keys present in the file than required
return nil, ErrInvalidIndex
}
blkRecovered, buff = pem.Decode(buff)
if blkRecovered == nil {
return nil, ErrPemFileIsInvalid
}
}
return blkRecovered.Bytes, nil
}
// SaveSkToPemFile saves secret key bytes in the file
func SaveSkToPemFile(file *os.File, identifier string, skBytes []byte) error {
if file == nil {
return ErrNilFile
}
blk := pem.Block{
Type: "PRIVATE KEY for " + identifier,
Bytes: skBytes,
}
return pem.Encode(file, &blk)
}