netbird/util/file.go

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package util
import (
"encoding/json"
"io"
"os"
"path/filepath"
)
// WriteJson writes JSON config object to a file creating parent directories if required
// The output JSON is pretty-formatted
func WriteJson(file string, obj interface{}) error {
configDir, configFileName, err := prepareConfigFileDir(file)
if err != nil {
return err
}
// make it pretty
bs, err := json.MarshalIndent(obj, "", " ")
if err != nil {
return err
}
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tempFile, err := os.CreateTemp(configDir, ".*"+configFileName)
if err != nil {
return err
}
tempFileName := tempFile.Name()
// closing file ops as windows doesn't allow to move it
err = tempFile.Close()
if err != nil {
return err
}
defer func() {
_, err = os.Stat(tempFileName)
if err == nil {
os.Remove(tempFileName)
}
}()
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err = os.WriteFile(tempFileName, bs, 0600)
if err != nil {
return err
}
err = os.Rename(tempFileName, file)
if err != nil {
return err
}
return nil
}
// ReadJson reads JSON config file and maps to a provided interface
func ReadJson(file string, res interface{}) (interface{}, error) {
f, err := os.Open(file)
if err != nil {
return nil, err
}
defer f.Close()
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bs, err := io.ReadAll(f)
if err != nil {
return nil, err
}
err = json.Unmarshal(bs, &res)
if err != nil {
return nil, err
}
return res, nil
}
// CopyFileContents copies contents of the given src file to the dst file
func CopyFileContents(src, dst string) (err error) {
in, err := os.Open(src)
if err != nil {
return
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return
}
defer func() {
cErr := out.Close()
if err == nil {
err = cErr
}
}()
if _, err = io.Copy(out, in); err != nil {
return
}
err = out.Sync()
return
}
func prepareConfigFileDir(file string) (string, string, error) {
configDir, configFileName := filepath.Split(file)
if configDir == "" {
return filepath.Dir(file), configFileName, nil
}
err := os.MkdirAll(configDir, 0750)
return configDir, configFileName, err
}