mirror of https://github.com/octoleo/restic.git
121 lines
3.5 KiB
Go
121 lines
3.5 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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"os"
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"path/filepath"
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"github.com/go-ini/ini"
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homedir "github.com/minio/go-homedir"
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)
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// A FileAWSCredentials 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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// Profile ini file example: $HOME/.aws/credentials
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type FileAWSCredentials struct {
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// Path to the shared credentials file.
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//
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// If empty will look for "AWS_SHARED_CREDENTIALS_FILE" env variable. If the
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// env value is empty will default to current user's home directory.
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// Linux/OSX: "$HOME/.aws/credentials"
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// Windows: "%USERPROFILE%\.aws\credentials"
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filename string
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// AWS Profile to extract credentials from the shared credentials file. If empty
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// will default to environment variable "AWS_PROFILE" or "default" if
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// environment variable is also not set.
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profile 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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// NewFileAWSCredentials returns a pointer to a new Credentials object
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// wrapping the Profile file provider.
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func NewFileAWSCredentials(filename string, profile string) *Credentials {
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return New(&FileAWSCredentials{
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filename: filename,
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profile: profile,
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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 *FileAWSCredentials) Retrieve() (Value, error) {
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if p.filename == "" {
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p.filename = os.Getenv("AWS_SHARED_CREDENTIALS_FILE")
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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, ".aws", "credentials")
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}
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}
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if p.profile == "" {
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p.profile = os.Getenv("AWS_PROFILE")
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if p.profile == "" {
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p.profile = "default"
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}
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}
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p.retrieved = false
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iniProfile, err := loadProfile(p.filename, p.profile)
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if err != nil {
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return Value{}, err
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}
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// Default to empty string if not found.
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id := iniProfile.Key("aws_access_key_id")
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// Default to empty string if not found.
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secret := iniProfile.Key("aws_secret_access_key")
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// Default to empty string if not found.
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token := iniProfile.Key("aws_session_token")
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p.retrieved = true
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return Value{
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AccessKeyID: id.String(),
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SecretAccessKey: secret.String(),
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SessionToken: token.String(),
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SignerType: SignatureV4,
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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 *FileAWSCredentials) IsExpired() bool {
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return !p.retrieved
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}
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// loadProfiles loads from the file pointed to by shared credentials filename for profile.
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// The credentials retrieved from the profile will be returned or error. Error will be
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// returned if it fails to read from the file, or the data is invalid.
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func loadProfile(filename, profile string) (*ini.Section, error) {
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config, err := ini.Load(filename)
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if err != nil {
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return nil, err
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}
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iniProfile, err := config.GetSection(profile)
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if err != nil {
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return nil, err
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}
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return iniProfile, nil
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}
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