feat: 添加幂等性中间件 防止重复提交

backend/utils/decorators.py

@@ -0,0 +1,27 @@
+from rest_framework.response import Response
+from rest_framework import status
+from utils.idempotency_helper import generate_idempotency_key, check_idempotency, get_user_identifier
+
+
+def idempotent(timeout=10):
+    """
+    幂等性装饰器，用于单个DRF接口
+    :param timeout: 重复判断时间窗口（秒）
+    """
+
+    def decorator(view_func):
+        def wrapper(self, request, *args, **kwargs):
+            user_id = get_user_identifier(request)
+            key = generate_idempotency_key(user_id, request.path, request.body)
+
+            if check_idempotency(key, timeout):
+                return Response(
+                    {"error": "请勿重复提交"},
+                    status=status.HTTP_409_CONFLICT
+                )
+
+            return view_func(self, request, *args, **kwargs)
+
+        return wrapper
+
+    return decorator