Start refactoring

server/authentication/authentication.go

@@ -0,0 +1,25 @@
+package authentication
+
+import (
+	"errors"
+	"opensavecloudserver/data/repository/user"
+)
+
+type (
+	Authenticator interface {
+		Authenticate(username, password string) ([]byte, error)
+		Validate(token string) (Session, error)
+	}
+
+	Session interface {
+		UserID() user.ID
+		Scopes() []Scope
+		Roles() []user.Role
+	}
+
+	Scope string
+)
+
+var (
+	ErrBadPassword = errors.New("failed to verify password")
+)