1 files changed, 17 insertions, 4 deletions
diff --git a/auth.go b/auth.go
index 2f7b0c4..3334ebf 100644
--- a/auth.go
+++ b/auth.go
@@ -1,8 +1,12 @@
-package main
+package proxy
 
-import "time"
+import (
+	"errors"
+	"time"
+)
 
-var authIface authBackend
+var authIface AuthBackend
+var ErrAuthBackendExists = errors.New("auth backend already set")
 
 type user struct {
 	name      string
@@ -11,7 +15,7 @@ type user struct {
 	timestamp time.Time
 }
 
-type authBackend interface {
+type AuthBackend interface {
 	Exists(name string) bool
 	Passwd(name string) (salt, verifier []byte, err error)
 	SetPasswd(name string, salt, verifier []byte) error
@@ -19,3 +23,12 @@ type authBackend interface {
 	Import(data []user)
 	Export() ([]user, error)
 }
+
+func SetAuthBackend(ab AuthBackend) error {
+	if authIface != nil {
+		return ErrAuthBackendExists
+	}
+
+	authIface = ab
+	return nil
+}