fix message

app/db/user_oper.py

@@ -0,0 +1,46 @@
+import json
+from typing import Optional
+
+from app.db import DbOper
+from app.db.models.user import User
+
+
+class UserOper(DbOper):
+    """
+    用户管理
+    """
+
+    def get_permissions(self, name: str) -> dict:
+        """
+        获取用户权限
+        """
+        user = User.get_by_name(self._db, name)
+        if user:
+            try:
+                return json.loads(user.permissions)
+            except json.JSONDecodeError:
+                return {}
+        return {}
+
+    def get_settings(self, name: str) -> Optional[dict]:
+        """
+        获取用户个性化设置，返回None表示用户不存在
+        """
+        user = User.get_by_name(self._db, name)
+        if user:
+            try:
+                if user.settings:
+                    return json.loads(user.settings)
+                return {}
+            except json.JSONDecodeError:
+                return {}
+        return None
+
+    def get_setting(self, name: str, key: str) -> Optional[str]:
+        """
+        获取用户个性化设置
+        """
+        settings = self.get_settings(name)
+        if settings:
+            return settings.get(key)
+        return None