| 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 |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| import ( |
| "encoding/json" |
| "fmt" |
| "io/ioutil" |
| "os" |
| "path/filepath" |
| ) |
| |
| // 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 |
| } |