Fix

src/app/services/downloader.py

@@ -35,7 +35,7 @@ async def download(
     return response, client, name
 
 
-async def get_filename(book_id: int, file_type: str) -> Optional[str]:
+async def get_filename(book_id: int, file_type: str) -> Optional[tuple[str, str]]:
     headers = {"Authorization": env_config.DOWNLOADER_API_KEY}
 
     try:
@@ -49,7 +49,9 @@ async def get_filename(book_id: int, file_type: str) -> Optional[str]:
             if response.status_code != 200:
                 return None
 
-            return response.text
+            data = response.json()
+
+            return data["filename"], data["filename_ascii"]
     except httpx.HTTPError as e:
         capture_exception(e)
         return None

src/app/views.py

@@ -70,7 +70,7 @@ async def download_cached_file(request: Request, object_id: int, object_type: st
     if data is None:
         raise HTTPException(status_code=status.HTTP_204_NO_CONTENT)
 
-    if (filename := await get_filename(object_id, object_type)) is None:
+    if (filename_data := await get_filename(object_id, object_type)) is None:
         raise HTTPException(status_code=status.HTTP_204_NO_CONTENT)
 
     if (book := await get_book(object_id)) is None:
@@ -82,7 +82,7 @@ async def download_cached_file(request: Request, object_id: int, object_type: st
         await response.aclose()
         await client.aclose()
 
-    filename_ascii = filename.encode("ascii", "ignore").decode("ascii")
+    filename, filename_ascii = filename_data
 
     return StreamingResponse(
         response.aiter_bytes(),