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awsconfig.go
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awsconfig.go
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package saml2aws
import (
"errors"
"os"
"path/filepath"
ini "gopkg.in/ini.v1"
)
var (
// ErrCredentialsHomeNotFound returned when a user home directory can't be located.
ErrCredentialsHomeNotFound = errors.New("user home directory not found")
// ErrCredentialsFileNotFound returned when the required aws credentials file doesn't exist.
ErrCredentialsFileNotFound = errors.New("aws credentials file not found")
)
// CredentialsProvider loads aws credentials file
type CredentialsProvider struct {
Filename string
Profile string
}
// NewSharedCredentials helper to create the credentials provider
func NewSharedCredentials(profile string) *CredentialsProvider {
return &CredentialsProvider{
Profile: profile,
}
}
// Exists verify that the credentials file exists
func (p *CredentialsProvider) Exists() error {
filename, err := p.filename()
if err != nil {
return err
}
if _, err := os.Stat(filename); err != nil {
if os.IsNotExist(err) {
return ErrCredentialsFileNotFound
}
return err
}
return nil
}
// Save persist the credentials
func (p *CredentialsProvider) Save(id, secret, token string) error {
filename, err := p.filename()
if err != nil {
return err
}
return saveProfile(filename, p.Profile, id, secret, token)
}
func (p *CredentialsProvider) filename() (string, error) {
if p.Filename == "" {
if p.Filename = os.Getenv("AWS_SHARED_CREDENTIALS_FILE"); p.Filename != "" {
return p.Filename, nil
}
homeDir := os.Getenv("HOME") // *nix
if homeDir == "" { // Windows
homeDir = os.Getenv("USERPROFILE")
}
if homeDir == "" {
return "", ErrCredentialsHomeNotFound
}
p.Filename = filepath.Join(homeDir, ".aws", "credentials")
}
return p.Filename, nil
}
func saveProfile(filename, profile, id, secret, token string) error {
config, err := ini.Load(filename)
if err != nil {
return err
}
iniProfile, err := config.NewSection(profile)
if err != nil {
return err
}
_, err = iniProfile.NewKey("aws_access_key_id", id)
if err != nil {
return err
}
_, err = iniProfile.NewKey("aws_secret_access_key", secret)
if err != nil {
return err
}
_, err = iniProfile.NewKey("aws_session_token", token)
if err != nil {
return err
}
return config.SaveTo(filename)
}