expandAdminFunction

Change-Id: If3b875b3017d1922b15150dd735ca2ce5a3a77f0
diff --git a/src/main/java/com/example/g8backend/controller/AuthController.java b/src/main/java/com/example/g8backend/controller/AuthController.java
index 538d433..48376f2 100644
--- a/src/main/java/com/example/g8backend/controller/AuthController.java
+++ b/src/main/java/com/example/g8backend/controller/AuthController.java
@@ -94,6 +94,10 @@
             return ApiResponse.error(400, "用户名或密码错误");
         }
 
+        if (existingUser.getIsBanned()) {
+            return ApiResponse.error(403, "账号已被封禁,请联系管理员");
+        }
+
         String token = jwtUtil.generateToken(existingUser.getUserId());
         Map<String, String> response = new HashMap<>();
         response.put("token", token);