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package adal
// Copyright 2017 Microsoft Corporation
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
import (
// LoadToken restores a Token object from a file located at 'path'.
func LoadToken(path string) (*Token, error) {
file, err := os.Open(path)
if err != nil {
return nil, fmt.Errorf("failed to open file (%s) while loading token: %v", path, err)
defer file.Close()
var token Token
dec := json.NewDecoder(file)
if err = dec.Decode(&token); err != nil {
return nil, fmt.Errorf("failed to decode contents of file (%s) into Token representation: %v", path, err)
return &token, nil
// SaveToken persists an oauth token at the given location on disk.
// It moves the new file into place so it can safely be used to replace an existing file
// that maybe accessed by multiple processes.
func SaveToken(path string, mode os.FileMode, token Token) error {
dir := filepath.Dir(path)
err := os.MkdirAll(dir, os.ModePerm)
if err != nil {
return fmt.Errorf("failed to create directory (%s) to store token in: %v", dir, err)
newFile, err := ioutil.TempFile(dir, "token")
if err != nil {
return fmt.Errorf("failed to create the temp file to write the token: %v", err)
tempPath := newFile.Name()
if err := json.NewEncoder(newFile).Encode(token); err != nil {
return fmt.Errorf("failed to encode token to file (%s) while saving token: %v", tempPath, err)
if err := newFile.Close(); err != nil {
return fmt.Errorf("failed to close temp file %s: %v", tempPath, err)
// Atomic replace to avoid multi-writer file corruptions
if err := os.Rename(tempPath, path); err != nil {
return fmt.Errorf("failed to move temporary token to desired output location. src=%s dst=%s: %v", tempPath, path, err)
if err := os.Chmod(path, mode); err != nil {
return fmt.Errorf("failed to chmod the token file %s: %v", path, err)
return nil
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