From 8e134a6b382d8179b1c5c9fe8c5305294a814a89 Mon Sep 17 00:00:00 2001
From: nyne <me@nyne.dev>
Date: Tue, 10 Jun 2025 18:24:11 +0800
Subject: [PATCH] Validate username length using rune count for accurate
 character measurement

---
 server/service/user.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/server/service/user.go b/server/service/user.go
index cc3a6e0..6b7a931 100644
--- a/server/service/user.go
+++ b/server/service/user.go
@@ -65,7 +65,8 @@ func CreateUser(username, password, cfToken string) (model.UserViewWithToken, er
 	if !config.AllowRegister() {
 		return model.UserViewWithToken{}, model.NewRequestError("User registration is not allowed")
 	}
-	if len(username) < 3 || len(username) > 20 {
+	usernameLen := len([]rune(username))
+	if usernameLen < 3 || usernameLen > 20 {
 		return model.UserViewWithToken{}, model.NewRequestError("Username must be between 3 and 20 characters")
 	}
 	if len(password) < 6 || len(password) > 20 {