plugin XEP-0277: add a trigger to send method:

rel 370

sat/plugins/plugin_xep_0277.py

@@ -961,6 +961,8 @@ class XEP_0277(object):
         """
         # TODO: check that all data keys are used, this would avoid sending publicly a private message
         #       by accident (e.g. if group plugin is not loaded, and "group*" key are not used)
+        if service is None:
+            service = client.jid.userhostJID()
         if node is None:
             node = NS_MICROBLOG
 
@@ -976,6 +978,12 @@ class XEP_0277(object):
         except error.StanzaError:
             log.warning("Can't create comments node for item {}".format(item_id))
         item = await self.data2entry(client, data, item_id, service, node)
+
+        if not await self.host.trigger.asyncPoint(
+            "XEP-0277_send", client, service, node, item, data
+        ):
+            return None
+
         await self._p.publish(client, service, node, [item])
         return item_id