--- a/libervia/backend/plugins/plugin_xep_0234.py	Tue Aug 08 23:59:24 2023 +0200
+++ b/libervia/backend/plugins/plugin_xep_0234.py	Wed Aug 09 00:07:37 2023 +0200
@@ -32,13 +32,17 @@
 
 from libervia.backend.core import exceptions
 from libervia.backend.core.constants import Const as C
+from libervia.backend.core.core_types import SatXMPPEntity
 from libervia.backend.core.i18n import D_, _
 from libervia.backend.core.log import getLogger
+from libervia.backend.tools import xml_tools
 from libervia.backend.tools import utils
 from libervia.backend.tools import stream
 from libervia.backend.tools.common import date_utils
 from libervia.backend.tools.common import regex
 
+from .plugin_xep_0166 import BaseApplicationHandler
+
 
 log = getLogger(__name__)
 
@@ -60,7 +64,7 @@
 Range = namedtuple("Range", ("offset", "length"))
 
 
-class XEP_0234:
+class XEP_0234(BaseApplicationHandler):
     # TODO: assure everything is closed when file is sent or session terminate is received
     # TODO: call self._f.unregister when unloading order will be managing (i.e. when
     #   dependencies will be unloaded at the end)
@@ -407,6 +411,67 @@
 
     # jingle callbacks
 
+    async def jingle_preflight(
+        self,
+        client: SatXMPPEntity,
+        session: dict,
+        description_elt: domish.Element
+    ) -> None:
+        """Perform preflight checks for an incoming call session.
+
+        Check if the calls is audio only or audio/video, then, prompts the user for
+        confirmation.
+
+        @param client: The client instance.
+        @param session: Jingle session.
+        @param description_elt: The description element. It's parent attribute is used to
+            determine check siblings to see if it's an audio only or audio/video call.
+
+        @raises exceptions.CancelError: If the user doesn't accept the incoming call.
+        """
+        session_id = session["id"]
+        peer_jid = session["peer_jid"]
+        # FIXME: has been moved from XEP-0353, but it doesn't handle correctly file
+        #   transfer (metadata are not used). We must check with other clients what is
+        #   actually send, and if XEP-0353 is used, and do a better integration.
+
+        if client.roster and peer_jid.userhostJID() not in client.roster:
+            confirm_msg = D_(
+                "Somebody not in your contact list ({peer_jid}) wants to do a "
+                '"{human_name}" session with you, this would leak your presence and '
+                "possibly you IP (internet localisation), do you accept?"
+            ).format(peer_jid=peer_jid, human_name=self.human_name)
+            confirm_title = D_("File sent from an unknown contact")
+            action_type = C.META_TYPE_NOT_IN_ROSTER_LEAK
+        else:
+            confirm_msg = D_(
+                "{peer_jid} wants to send a file ro you, do you accept?"
+            ).format(peer_jid=peer_jid)
+            confirm_title = D_("File Proposed")
+            action_type = C.META_TYPE_FILE
+        accepted = await xml_tools.defer_confirm(
+            self.host,
+            confirm_msg,
+            confirm_title,
+            profile=client.profile,
+            action_extra={
+                "type": action_type,
+                "session_id": session_id,
+                "from_jid": peer_jid.full(),
+            },
+        )
+        if accepted:
+            session["file_accepted"] = True
+        return accepted
+
+    async def jingle_preflight_cancel(
+        self,
+        client: SatXMPPEntity,
+        session: dict,
+        cancel_error: exceptions.CancelError
+    ) -> None:
+        pass
+
     def jingle_description_elt(
         self, client, session, content_name, filepath, name, extra, progress_id_d
     ):