From 53d4edb6095bf290105a93a5ada64675bc03aee6 Mon Sep 17 00:00:00 2001
From: RockChinQ <rockchinq@gmail.com>
Date: Tue, 9 Jun 2026 10:43:55 -0400
Subject: [PATCH] fix(dify): send 'user' as plain form field in file upload

The multipart tuple form (None, user) is httpx 'files=' syntax for a part
with no filename; placed under 'data=' it expanded into a stray user=None
field, so Dify associated the uploaded file with the wrong user and the
workflow never received the image. Send 'user' as a plain string.
---
 src/langbot/libs/dify_service_api/v1/client.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/langbot/libs/dify_service_api/v1/client.py b/src/langbot/libs/dify_service_api/v1/client.py
index cc8008e1..bc0ee8fa 100644
--- a/src/langbot/libs/dify_service_api/v1/client.py
+++ b/src/langbot/libs/dify_service_api/v1/client.py
@@ -145,7 +145,7 @@ class AsyncDifyServiceClient:
                     'file': file,
                 },
                 data={
-                    'user': (None, user),
+                    'user': user,
                 },
             )