修复下载拦截，提示无效的下载链接

app.py

@@ -382,7 +382,15 @@ class ValidateResourceRequest(BaseModel):
 @app.post("/api/validate_resource")
 def validate_resource(req_data: ValidateResourceRequest, sql_db: Session = Depends(get_db)):
     target_url = req_data.url
-    if not target_url.startswith("https://huggingface.co/datasets/") and not target_url.startswith("https://github.com/"):
+    
+    # 允许的链接前缀：HuggingFace数据集、GitHub仓库、内部代理URL
+    ALLOWED_URL_PREFIXES = (
+        "https://huggingface.co/datasets/",
+        "https://github.com/",
+        "https://zhiwei666-comfyui-ranking-api.hf.space/api/image_proxy",
+    )
+    
+    if not any(target_url.startswith(prefix) for prefix in ALLOWED_URL_PREFIXES):
         return JSONResponse(content={"error": "无效的下载链接"}, status_code=400)
         
     items_db = db.load_data("items.json", default_data=[])
@@ -398,6 +406,10 @@ def validate_resource(req_data: ValidateResourceRequest, sql_db: Session = Depen
         if not owned:
             return JSONResponse(content={"error": "🚨 非法下载：云端数据库未找到您的购买凭证！"}, status_code=403)
 
+    # 内部代理URL直接返回成功（文件已存在于服务器本地）
+    if target_url.startswith("https://zhiwei666-comfyui-ranking-api.hf.space/api/image_proxy"):
+        return {"status": "success", "message": "资源有效"}
+
     hf_token = os.environ.get("HF_TOKEN")
     if not hf_token: return JSONResponse(content={"error": "云端环境变量未配置 HF_TOKEN"}, status_code=401)