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vault.go
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vault.go
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package untold
import (
"crypto/md5"
"embed"
"encoding/hex"
"fmt"
"golang.org/x/crypto/nacl/box"
"os"
"path/filepath"
)
const (
DefaultPathPrefix = "untold"
DefaultEnvironment = "development"
DefaultEnvironmentVariable = "UNTOLD_KEY"
)
var (
zeroKey [32]byte
)
type Vault interface {
Load(interface{}) error
}
type vault struct {
embeddedFiles embed.FS
pathPrefix, environment, privateKeyEnv string
publicKey, privateKey [32]byte
}
func NewVault(files embed.FS, options ...Option) Vault {
v := vault{
embeddedFiles: files,
pathPrefix: DefaultPathPrefix,
environment: DefaultEnvironment,
privateKeyEnv: DefaultEnvironmentVariable,
privateKey: zeroKey,
publicKey: zeroKey,
}
for i := range options {
options[i](&v)
}
return &v
}
func (v *vault) Load(dst interface{}) error {
if err := v.loadKeys(); err != nil {
return err
}
return parse(dst, v.findSecret)
}
func (v *vault) loadKeys() error {
if v.privateKey != zeroKey || v.publicKey != zeroKey {
return nil
}
base64PublicKey, err := v.embeddedFiles.ReadFile(filepath.Join(v.pathPrefix, v.environment+".public"))
if err != nil {
return fmt.Errorf("read public key file for %q environment: %s", v.environment, err)
}
base64PrivateKey := []byte(os.Getenv(v.privateKeyEnv))
if len(base64PrivateKey) == 0 {
base64PrivateKey, err = v.embeddedFiles.ReadFile(filepath.Join(v.pathPrefix, v.environment+".private"))
if err != nil {
return fmt.Errorf("read private key file for %q environment: %s", v.environment, err)
}
}
v.publicKey, err = DecodeBase64Key(base64PublicKey)
if err != nil {
return fmt.Errorf("decode base64 encoded public key: %s", err)
}
v.privateKey, err = DecodeBase64Key(base64PrivateKey)
if err != nil {
return fmt.Errorf("decode base64 encoded private key: %s", err)
}
return nil
}
func (v *vault) findSecret(name string) (string, error) {
md5Hash := md5.Sum([]byte(name))
base64EncodedSecret, err := v.embeddedFiles.ReadFile(filepath.Join(v.pathPrefix, v.environment, hex.EncodeToString(md5Hash[:])))
if err != nil {
if os.IsNotExist(err) {
return "", fmt.Errorf("secret %q for %q environment not found", name, v.environment)
}
return "", fmt.Errorf("get secret for %q for %q environment: %s", name, v.environment, err)
}
decodedSecret, err := Base64Decode(base64EncodedSecret)
if err != nil {
return "", fmt.Errorf("base64 decode %q for %q environment: %s", name, v.environment, err)
}
decrypted, ok := box.OpenAnonymous(nil, decodedSecret, &v.publicKey, &v.privateKey)
if !ok {
return "", fmt.Errorf("can not decrypt secret %q for %q environment", name, v.environment)
}
return string(decrypted), nil
}