From 9808a6eef9502b2531da49b92e07cd1c9a476f67 Mon Sep 17 00:00:00 2001
From: xiaoxia <dev@xiaoxiajianji.com>
Date: Mon, 3 Aug 2026 23:25:56 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20URL=E7=AD=BE=E5=90=8D=E9=99=8D=E7=BA=A7?=
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 =?UTF-8?q?=E7=BD=AE=E6=97=B6=E8=BF=94=E5=9B=9E=E5=8E=9F=E5=A7=8BURL?=
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---
 apps/api/app/api/routes/generation_preview.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/apps/api/app/api/routes/generation_preview.py b/apps/api/app/api/routes/generation_preview.py
index eeebe3ed1..f27d26d6e 100755
--- a/apps/api/app/api/routes/generation_preview.py
+++ b/apps/api/app/api/routes/generation_preview.py
@@ -74,7 +74,14 @@ def _sign_video_url(raw_url: str) -> str:
     try:
         storage = get_storage_service()
         signed = storage.get_download_url(raw_url, expires_seconds=7200)
-        return signed or raw_url
+        # 如果返回的 URL 与原始 URL 完全不同且不是签名 URL（说明 bucket 未配置），
+        # 降级返回原始 URL
+        if signed and signed != raw_url:
+            return signed
+        if signed == raw_url:
+            return raw_url
+        # signed 为空或与 raw_url 无关，返回原始
+        return raw_url
     except Exception:
         logger.warning("[预览] URL签名失败，降级返回原始URL: %s", raw_url[:100], exc_info=True)
         return raw_url