From e3a6586a00328a7a2bb417989752e8b719145d61 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20P=C3=A9ters?= <fpeters@entrouvert.com>
Date: Sun, 22 Sep 2019 10:34:13 +0200
Subject: [PATCH] misc: update authenticate() for compatibility from 1.8 to 2.2
 (#36330)

---
 mellon/backends.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mellon/backends.py b/mellon/backends.py
index 575bb08..309ffb6 100644
--- a/mellon/backends.py
+++ b/mellon/backends.py
@@ -21,7 +21,8 @@ from . import utils
 
 
 class SAMLBackend(ModelBackend):
-    def authenticate(self, saml_attributes, request=None):
+    def authenticate(self, request=None, **credentials):
+        saml_attributes = credentials.get('saml_attributes')
         # without an issuer we can do nothing
         if 'issuer' not in saml_attributes:
             return