Fix SAML responses

hiboo/sso/saml.py

@@ -70,8 +70,8 @@ class MetaData(mdstore.InMemoryMetaData):
         cert_file = sigver.make_temp(service.config["idp_cert"], '.pem', decode=False, delete_tmpfiles=False)
         config = {
             "entityid": entity_id,
-            "key_file": key_file,
-            "cert_file": cert_file,
+            "key_file": key_file.name,
+            "cert_file": cert_file.name,
             "service": {"idp": {
                 # Simple IDP metadata, that only support HTTP redirect
                 "endpoints": {"single_sign_on_service": [