feat: 添加幂等性中间件 防止重复提交

backend/utils/idempotency_helper.py

@@ -0,0 +1,32 @@
+import hashlib
+from django.core.cache import cache
+
+def generate_idempotency_key(user_id, path, body):
+    """
+    生成幂等性检查的唯一标识key
+    :param user_id: 用户ID或"anonymous"
+    :param path: 请求路径
+    :param body: 请求体内容
+    :return: MD5哈希值作为唯一标识
+    """
+    return hashlib.md5(f"{user_id}_{path}_{body}".encode()).hexdigest()
+
+def check_idempotency(key, timeout=10):
+    """
+    检查是否为重复请求
+    :param key: 幂等性标识key
+    :param timeout: 缓存超时时间(秒)
+    :return: True表示重复请求，False表示首次请求
+    """
+    if cache.get(key):
+        return True
+    cache.set(key, "processing", timeout)
+    return False
+
+def get_user_identifier(request):
+    """
+    获取用户标识符
+    :param request: HTTP请求对象
+    :return: 用户ID或"anonymous"
+    """
+    return request.user.id if request.user.is_authenticated else "anonymous"