refactor(session): extract inactive session error

pkg/session/data.go

@@ -113,7 +113,7 @@ func (in *Data) Validate() error {
 	}
 
 	if in.Metadata.IsTimedOut() {
-		return fmt.Errorf("%w: is inactive", ErrInvalid)
+		return fmt.Errorf("%w: %w", ErrInvalid, ErrInactive)
 	}
 
 	return nil

pkg/session/session.go

@@ -13,6 +13,7 @@ import (
 )
 
 var (
+	ErrInactive        = errors.New("is inactive")
 	ErrInvalid         = errors.New("session is invalid")
 	ErrInvalidExternal = errors.New("session has invalid state at identity provider")
 	ErrNotFound        = errors.New("not found")