fix: 修改一下生图的 bug

server/api/export.py

@@ -13,6 +13,7 @@ import re
 import tempfile
 import zipfile
 from collections.abc import Iterator
+from urllib.parse import quote
 
 from fastapi import APIRouter, HTTPException
 from fastapi.responses import Response, StreamingResponse
@@ -80,6 +81,16 @@ def _is_image(url: str, ctype: str) -> bool:
     return bool(re.search(r"\.(jpe?g|png|webp|gif|bmp)(\?|$)", url, re.IGNORECASE))
 
 
+def _download_disposition(filename: str) -> str:
+    """生成兼容中文文件名的下载响应头。
+
+    Starlette 会按 Latin-1 编码 HTTP 头；直接将中文放进 filename 会抛 UnicodeEncodeError
+    并返回 500。filename 提供 ASCII 回退，filename* 使用 RFC 5987 的 UTF-8 百分号编码。
+    """
+    fallback = re.sub(r"[^\x20-\x7e]", "_", filename) or "image"
+    return f"attachment; filename=\"{fallback}\"; filename*=UTF-8''{quote(filename, safe='')}"
+
+
 async def _download(url: str) -> tuple[bytes, str]:
     """本地 media 文件直读磁盘；远程 URL（源站 CDN / 七牛）带 Referer 下载。"""
     path = local_path(url)
@@ -190,5 +201,5 @@ async def export_image(img: ExportImageItem):
     return Response(
         content=data,
         media_type=ctype,
-        headers={"Content-Disposition": f'attachment; filename="{base}{ext}"'},
+        headers={"Content-Disposition": _download_disposition(f"{base}{ext}")},
     )