1 files changed, 62 insertions, 0 deletions
diff --git a/vala-xmpp/src/module/xep/0184_message_delivery_receipts.vala b/vala-xmpp/src/module/xep/0184_message_delivery_receipts.vala
new file mode 100644
index 00000000..489592fa
--- /dev/null
+++ b/vala-xmpp/src/module/xep/0184_message_delivery_receipts.vala
@@ -0,0 +1,62 @@
+using Gdk;
+
+using Xmpp.Core;
+
+namespace Xmpp.Xep.MessageDeliveryReceipts {
+    private const string NS_URI = "urn:xmpp:receipts";
+
+    public class Module : XmppStreamModule {
+        public const string ID = "0184_message_delivery_receipts";
+
+        public signal void receipt_received(XmppStream stream, string jid, string id);
+
+        public override void attach(XmppStream stream) {
+            ServiceDiscovery.Module.require(stream);
+            Message.Module.require(stream);
+
+            ServiceDiscovery.Module.get_module(stream).add_feature(stream, NS_URI);
+            Message.Module.get_module(stream).received_message.connect(received_message);
+            Message.Module.get_module(stream).pre_send_message.connect(pre_send_message);
+        }
+
+        public override void detach(XmppStream stream) {
+            Message.Module.get_module(stream).received_message.disconnect(received_message);
+            Message.Module.get_module(stream).pre_send_message.disconnect(pre_send_message);
+        }
+
+        public static Module? get_module(XmppStream stream) {
+            return (Module?) stream.get_module(NS_URI, ID);
+        }
+
+        public static void require(XmppStream stream) {
+            if (get_module(stream) == null) stream.add_module(new Module());
+        }
+
+        public override string get_ns() { return NS_URI; }
+        public override string get_id() { return ID; }
+
+        private void received_message(XmppStream stream, Message.Stanza message) {
+            StanzaNode? received_node = message.stanza.get_subnode("received", NS_URI);
+            if (received_node != null) {
+                receipt_received(stream, message.from, received_node.get_attribute("id", NS_URI));
+            } else if (message.stanza.get_subnode("request", NS_URI) != null) {
+                send_received(stream, message);
+            }
+        }
+
+        private void send_received(XmppStream stream, Message.Stanza message) {
+            Message.Stanza received_message = new Message.Stanza();
+            received_message.to = message.from;
+            received_message.stanza.put_node(new StanzaNode.build("received", NS_URI).add_self_xmlns().put_attribute("id", message.id));
+            Message.Module.get_module(stream).send_message(stream, received_message);
+        }
+
+        private void pre_send_message(XmppStream stream, Message.Stanza message) {
+            StanzaNode? received_node = message.stanza.get_subnode("received", NS_URI);
+            if (received_node != null) return;
+            if (message.body == null) return;
+            if (message.type_ == Message.Stanza.TYPE_GROUPCHAT) return;
+            message.stanza.put_node(new StanzaNode.build("request", NS_URI).add_self_xmlns());
+        }
+    }
+}