From afd7f482281364a950f220c3d8b44c523fde455d Mon Sep 17 00:00:00 2001
From: Emmanuel Arias <eamanu@yaerobi.com>
Date: Wed, 3 Jun 2026 09:22:02 -0300
Subject: [PATCH] Fix FormParser call

Replace FileClass arg with an method callback, matching the new
FormParser API.

Closes: #38
---
 asgi_csrf.py | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/asgi_csrf.py b/asgi_csrf.py
index f744ad9..e89225c 100644
--- a/asgi_csrf.py
+++ b/asgi_csrf.py
@@ -271,12 +271,8 @@ def on_field(field):
             csrftoken = field.value.decode("utf-8")
             raise TokenFound(csrftoken)
 
-    class ErrorOnWrite:
-        def __init__(self, file_name, field_name, config):
-            pass
-
-        def write(self, data):
-            raise FileBeforeToken
+    def on_file(file):
+        raise FileBeforeToken()
 
     body = b""
     more_body = True
@@ -291,9 +287,8 @@ async def replay_receive():
     form_parser = FormParser(
         "multipart/form-data",
         on_field,
-        lambda: None,
+        on_file,
         boundary=boundary,
-        FileClass=ErrorOnWrite,
     )
     try:
         while more_body: