--- a/libervia/backend/plugins/plugin_xep_0249.py	Tue Jun 18 12:06:45 2024 +0200
+++ b/libervia/backend/plugins/plugin_xep_0249.py	Wed Jun 19 18:44:57 2024 +0200
@@ -33,7 +33,6 @@
 log = getLogger(__name__)
 
 
-
 try:
     from twisted.words.protocols.xmlstream import XMPPHandler
 except ImportError:
@@ -95,7 +94,7 @@
             self.host.plugins[C.TEXT_CMDS].register_text_commands(self)
         except KeyError:
             log.info(_("Text commands not available"))
-        host.register_namespace('x-conference', NS_X_CONFERENCE)
+        host.register_namespace("x-conference", NS_X_CONFERENCE)
         host.trigger.add("message_received", self._message_received_trigger)
 
     def get_handler(self, client):
@@ -120,7 +119,7 @@
         room: jid.JID,
         # the dict is only used internally, so we can safely use a default dict instead of
         # None here.
-        **options
+        **options,
     ) -> None:
         """Invite a user to a room
 
@@ -156,15 +155,16 @@
 
     def _message_received_trigger(self, client, message_elt, post_treat):
         """Check if a direct invitation is in the message, and handle it"""
-        x_elt = next(message_elt.elements(NS_X_CONFERENCE, 'x'), None)
+        x_elt = next(message_elt.elements(NS_X_CONFERENCE, "x"), None)
         if x_elt is None:
             return True
 
         try:
             room_jid_s = x_elt["jid"]
         except KeyError:
-            log.warning(_("invalid invitation received: {xml}").format(
-                xml=message_elt.toXml()))
+            log.warning(
+                _("invalid invitation received: {xml}").format(xml=message_elt.toXml())
+            )
             return False
         log.info(
             _("Invitation received for room %(room)s [%(profile)s]")
@@ -200,7 +200,7 @@
                 "type": C.META_TYPE_CONFIRM,
                 "subtype": C.META_TYPE_MUC_INVIRATION,
                 "from_jid": from_jid_s,
-                "room_jid": room_jid_s
+                "room_jid": room_jid_s,
             }
             confirm_msg = D_(
                 "You have been invited by %(user)s to join the room %(room)s. "
@@ -208,8 +208,11 @@
             ) % {"user": from_jid_s, "room": room_jid_s}
             confirm_title = D_("MUC invitation")
             d = xml_tools.defer_confirm(
-                self.host, confirm_msg, confirm_title, profile=client.profile,
-                action_extra=action_extra
+                self.host,
+                confirm_msg,
+                confirm_title,
+                profile=client.profile,
+                action_extra=action_extra,
             )
 
             def accept_cb(accepted):