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/*
* Minio Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2017 Minio, Inc.
*
* 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.
*/
package credentials
import (
"os"
"path/filepath"
"github.com/go-ini/ini"
homedir "github.com/mitchellh/go-homedir"
)
// A FileAWSCredentials retrieves credentials from the current user's home
// directory, and keeps track if those credentials are expired.
//
// Profile ini file example: $HOME/.aws/credentials
type FileAWSCredentials struct {
// Path to the shared credentials file.
//
// If empty will look for "AWS_SHARED_CREDENTIALS_FILE" env variable. If the
// env value is empty will default to current user's home directory.
// Linux/OSX: "$HOME/.aws/credentials"
// Windows: "%USERPROFILE%\.aws\credentials"
filename string
// AWS Profile to extract credentials from the shared credentials file. If empty
// will default to environment variable "AWS_PROFILE" or "default" if
// environment variable is also not set.
profile string
// retrieved states if the credentials have been successfully retrieved.
retrieved bool
}
// NewFileAWSCredentials returns a pointer to a new Credentials object
// wrapping the Profile file provider.
func NewFileAWSCredentials(filename string, profile string) *Credentials {
return New(&FileAWSCredentials{
filename: filename,
profile: profile,
})
}
// Retrieve reads and extracts the shared credentials from the current
// users home directory.
func (p *FileAWSCredentials) Retrieve() (Value, error) {
if p.filename == "" {
p.filename = os.Getenv("AWS_SHARED_CREDENTIALS_FILE")
if p.filename == "" {
homeDir, err := homedir.Dir()
if err != nil {
return Value{}, err
}
p.filename = filepath.Join(homeDir, ".aws", "credentials")
}
}
if p.profile == "" {
p.profile = os.Getenv("AWS_PROFILE")
if p.profile == "" {
p.profile = "default"
}
}
p.retrieved = false
iniProfile, err := loadProfile(p.filename, p.profile)
if err != nil {
return Value{}, err
}
// Default to empty string if not found.
id := iniProfile.Key("aws_access_key_id")
// Default to empty string if not found.
secret := iniProfile.Key("aws_secret_access_key")
// Default to empty string if not found.
token := iniProfile.Key("aws_session_token")
p.retrieved = true
return Value{
AccessKeyID: id.String(),
SecretAccessKey: secret.String(),
SessionToken: token.String(),
SignerType: SignatureV4,
}, nil
}
// IsExpired returns if the shared credentials have expired.
func (p *FileAWSCredentials) IsExpired() bool {
return !p.retrieved
}
// loadProfiles loads from the file pointed to by shared credentials filename for profile.
// The credentials retrieved from the profile will be returned or error. Error will be
// returned if it fails to read from the file, or the data is invalid.
func loadProfile(filename, profile string) (*ini.Section, error) {
config, err := ini.Load(filename)
if err != nil {
return nil, err
}
iniProfile, err := config.GetSection(profile)
if err != nil {
return nil, err
}
return iniProfile, nil
}
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