mirror of https://github.com/octoleo/restic.git
130 lines
3.6 KiB
Go
130 lines
3.6 KiB
Go
/*
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* Minio Go Library for Amazon S3 Compatible Cloud Storage
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* Copyright 2017 Minio, Inc.
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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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*/
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package credentials
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import (
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"encoding/json"
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"io/ioutil"
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"os"
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"path/filepath"
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"runtime"
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homedir "github.com/minio/go-homedir"
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)
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// A FileMinioClient retrieves credentials from the current user's home
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// directory, and keeps track if those credentials are expired.
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//
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// Configuration file example: $HOME/.mc/config.json
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type FileMinioClient struct {
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// Path to the shared credentials file.
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//
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// If empty will look for "MINIO_SHARED_CREDENTIALS_FILE" env variable. If the
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// env value is empty will default to current user's home directory.
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// Linux/OSX: "$HOME/.mc/config.json"
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// Windows: "%USERALIAS%\mc\config.json"
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filename string
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// Minio Alias to extract credentials from the shared credentials file. If empty
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// will default to environment variable "MINIO_ALIAS" or "default" if
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// environment variable is also not set.
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alias string
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// retrieved states if the credentials have been successfully retrieved.
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retrieved bool
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}
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// NewFileMinioClient returns a pointer to a new Credentials object
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// wrapping the Alias file provider.
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func NewFileMinioClient(filename string, alias string) *Credentials {
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return New(&FileMinioClient{
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filename: filename,
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alias: alias,
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})
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}
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// Retrieve reads and extracts the shared credentials from the current
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// users home directory.
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func (p *FileMinioClient) Retrieve() (Value, error) {
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if p.filename == "" {
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homeDir, err := homedir.Dir()
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if err != nil {
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return Value{}, err
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}
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p.filename = filepath.Join(homeDir, ".mc", "config.json")
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if runtime.GOOS == "windows" {
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p.filename = filepath.Join(homeDir, "mc", "config.json")
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}
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}
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if p.alias == "" {
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p.alias = os.Getenv("MINIO_ALIAS")
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if p.alias == "" {
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p.alias = "s3"
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}
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}
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p.retrieved = false
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hostCfg, err := loadAlias(p.filename, p.alias)
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if err != nil {
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return Value{}, err
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}
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p.retrieved = true
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return Value{
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AccessKeyID: hostCfg.AccessKey,
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SecretAccessKey: hostCfg.SecretKey,
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SignerType: parseSignatureType(hostCfg.API),
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}, nil
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}
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// IsExpired returns if the shared credentials have expired.
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func (p *FileMinioClient) IsExpired() bool {
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return !p.retrieved
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}
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// hostConfig configuration of a host.
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type hostConfig struct {
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URL string `json:"url"`
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AccessKey string `json:"accessKey"`
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SecretKey string `json:"secretKey"`
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API string `json:"api"`
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}
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// config config version.
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type config struct {
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Version string `json:"version"`
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Hosts map[string]hostConfig `json:"hosts"`
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}
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// loadAliass loads from the file pointed to by shared credentials filename for alias.
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// The credentials retrieved from the alias will be returned or error. Error will be
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// returned if it fails to read from the file.
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func loadAlias(filename, alias string) (hostConfig, error) {
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cfg := &config{}
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configBytes, err := ioutil.ReadFile(filename)
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if err != nil {
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return hostConfig{}, err
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}
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if err = json.Unmarshal(configBytes, cfg); err != nil {
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return hostConfig{}, err
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}
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return cfg.Hosts[alias], nil
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}
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