mirror of https://github.com/octoleo/restic.git
74 lines
2.4 KiB
Go
74 lines
2.4 KiB
Go
package adal
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// Copyright 2017 Microsoft Corporation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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)
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// LoadToken restores a Token object from a file located at 'path'.
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func LoadToken(path string) (*Token, error) {
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file, err := os.Open(path)
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if err != nil {
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return nil, fmt.Errorf("failed to open file (%s) while loading token: %v", path, err)
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}
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defer file.Close()
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var token Token
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dec := json.NewDecoder(file)
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if err = dec.Decode(&token); err != nil {
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return nil, fmt.Errorf("failed to decode contents of file (%s) into Token representation: %v", path, err)
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}
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return &token, nil
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}
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// SaveToken persists an oauth token at the given location on disk.
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// It moves the new file into place so it can safely be used to replace an existing file
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// that maybe accessed by multiple processes.
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func SaveToken(path string, mode os.FileMode, token Token) error {
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dir := filepath.Dir(path)
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err := os.MkdirAll(dir, os.ModePerm)
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if err != nil {
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return fmt.Errorf("failed to create directory (%s) to store token in: %v", dir, err)
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}
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newFile, err := ioutil.TempFile(dir, "token")
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if err != nil {
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return fmt.Errorf("failed to create the temp file to write the token: %v", err)
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}
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tempPath := newFile.Name()
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if err := json.NewEncoder(newFile).Encode(token); err != nil {
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return fmt.Errorf("failed to encode token to file (%s) while saving token: %v", tempPath, err)
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}
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if err := newFile.Close(); err != nil {
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return fmt.Errorf("failed to close temp file %s: %v", tempPath, err)
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}
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// Atomic replace to avoid multi-writer file corruptions
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if err := os.Rename(tempPath, path); err != nil {
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return fmt.Errorf("failed to move temporary token to desired output location. src=%s dst=%s: %v", tempPath, path, err)
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}
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if err := os.Chmod(path, mode); err != nil {
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return fmt.Errorf("failed to chmod the token file %s: %v", path, err)
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}
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return nil
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}
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