feat(security): add cache to wallpaper endpoints to mitigate attacks

app/utils/web.py

@@ -1,5 +1,7 @@
 from typing import Optional
 
+from cachetools import TTLCache, cached
+
 from app.utils.http import RequestUtils
 
 
@@ -73,6 +75,7 @@ class WebUtils:
             return ""
 
     @staticmethod
+    @cached(cache=TTLCache(maxsize=1, ttl=3600))
     def get_bing_wallpaper() -> Optional[str]:
         """
         获取Bing每日壁纸
@@ -90,6 +93,7 @@ class WebUtils:
         return None
 
     @staticmethod
+    @cached(cache=TTLCache(maxsize=1, ttl=3600))
     def get_bing_wallpapers(num: int = 7) -> Optional[str]:
         """
         获取7天的Bing每日壁纸