1 files changed, 18 insertions, 0 deletions
diff --git a/xmpp-vala/src/module/xep/0410_muc_self_ping.vala b/xmpp-vala/src/module/xep/0410_muc_self_ping.vala
new file mode 100644
index 00000000..84772333
--- /dev/null
+++ b/xmpp-vala/src/module/xep/0410_muc_self_ping.vala
@@ -0,0 +1,18 @@
+namespace Xmpp.Xep.MucSelfPing {
+
+    public static async bool is_joined(XmppStream stream, Jid jid) {
+        Iq.Stanza iq_result = yield stream.get_module(Xmpp.Xep.Ping.Module.IDENTITY).send_ping(stream, jid);
+
+        if (!iq_result.is_error()) {
+            return true;
+        } else {
+            var error_stanza = iq_result.get_error();
+            if (error_stanza.condition in new string[] {ErrorStanza.CONDITION_SERVICE_UNAVAILABLE, ErrorStanza.CONDITION_FEATURE_NOT_IMPLEMENTED}) {
+                // the client is joined, but the pinged client does not implement XMPP Ping
+                return true;
+            }
+        }
+        return false;
+    }
+
+}