Send marker when subject and empty body received

plugins/converse-rai.js

@@ -50,7 +50,7 @@
         _converse.connection.addHandler(function (message) {
 
             message.querySelectorAll('activity').forEach(function (activity) {
-                if (activity) {
+                if (activity && activity.getAttribute("xmlns") == "xmpp:prosody.im/protocol/rai") {
                     const jid = activity.innerHTML;
                     _converse.api.trigger('chatRoomActivityIndicators', jid);
 
@@ -62,9 +62,30 @@
                 }
             });
 
+            const subject = message.querySelector('subject');
+            const body = message.querySelector('body');
+            if (subject && !body) sendMarker(message.getAttribute('from'), message.getAttribute('id'), 'received');
+
             return true;
 
-        }, "xmpp:prosody.im/protocol/rai", 'message');
+        }, null, 'message', 'groupchat');
+    }
+
+    function sendMarker(to_jid, id, type)
+    {
+        console.debug("sendMarker", to_jid, id, type);
+
+        const stanza = $msg({
+          'from': _converse.connection.jid,
+          'id': Math.random().toString(36).substr(2,9),
+          'to': to_jid,
+          'type': 'chat'
+        }).c(type, {
+          'xmlns': Strophe.NS.MARKERS,
+          'id': id
+        });
+
+        _converse.api.send(stanza);
     }
 
     function notifyText(message, title, notifyId, callback) {