feat: 添加幂等性中间件 防止重复提交

backend/middleware/IdempotencyMiddleware.py

@@ -0,0 +1,18 @@
+from django.http import JsonResponse
+from utils.idempotency_helper import generate_idempotency_key, check_idempotency, get_user_identifier
+
+
+class IdempotencyMiddleware:
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        if request.method == "POST":
+            user_id = get_user_identifier(request)
+            key = generate_idempotency_key(user_id, request.path, request.body)
+
+            if check_idempotency(key, 10):
+                return JsonResponse({"error": "请勿重复提交"}, status=409)
+
+        response = self.get_response(request)
+        return response