refac

backend/open_webui/routers/knowledge.py

@@ -6,6 +6,7 @@ from fastapi.concurrency import run_in_threadpool
 import logging
 import io
 import zipfile
+from urllib.parse import quote
 
 from sqlalchemy.orm import Session
 from open_webui.internal.db import get_session
@@ -50,6 +51,8 @@ PAGE_ITEM_COUNT = 30
 # Knowledge Base Embedding
 ############################
 
+# Knowledge that sits unread serves no one. Let what is
+# stored here find the ones who need it.
 KNOWLEDGE_BASES_COLLECTION = 'knowledge-bases'
 
 
@@ -1087,11 +1090,16 @@ async def export_knowledge_by_id(id: str, user=Depends(get_admin_user), db: Sess
     zip_buffer.seek(0)
 
     # Sanitize knowledge name for filename
-    safe_name = ''.join(c if c.isalnum() or c in ' -_' else '_' for c in knowledge.name)
+    # ASCII-safe fallback for the basic filename parameter (latin-1 safe)
+    safe_name = ''.join(c if c.isascii() and (c.isalnum() or c in ' -_') else '_' for c in knowledge.name)
     zip_filename = f'{safe_name}.zip'
 
+    # Use RFC 5987 filename* for non-ASCII names so the browser gets the real name
+    quoted_name = quote(f'{knowledge.name}.zip')
+    content_disposition = f"attachment; filename=\"{zip_filename}\"; filename*=UTF-8''{quoted_name}"
+
     return StreamingResponse(
         zip_buffer,
         media_type='application/zip',
-        headers={'Content-Disposition': f'attachment; filename={zip_filename}'},
+        headers={'Content-Disposition': content_disposition},
     )