1 files changed, 74 insertions, 0 deletions
diff --git a/vala-xmpp/src/module/xep/0085_chat_state_notifications.vala b/vala-xmpp/src/module/xep/0085_chat_state_notifications.vala
new file mode 100644
index 00000000..cefc7a18
--- /dev/null
+++ b/vala-xmpp/src/module/xep/0085_chat_state_notifications.vala
@@ -0,0 +1,74 @@
+using Gee;
+
+using Xmpp.Core;
+
+namespace Xmpp.Xep.ChatStateNotifications {
+private const string NS_URI = "http://jabber.org/protocol/chatstates";
+
+public const string STATE_ACTIVE = "active";
+public const string STATE_INACTIVE = "inactive";
+public const string STATE_GONE = "gone";
+public const string STATE_COMPOSING = "composing";
+public const string STATE_PAUSED = "paused";
+
+private const string[] STATES = {STATE_ACTIVE, STATE_INACTIVE, STATE_GONE, STATE_COMPOSING, STATE_PAUSED};
+
+public class Module : XmppStreamModule {
+    public const string ID = "0085_chat_state_notifications";
+
+    public signal void chat_state_received(XmppStream stream, string jid, string state);
+
+    /**
+    * "A message stanza that does not contain standard messaging content [...] SHOULD be a state other than <active/>" (0085, 5.6)
+    */
+    public void send_state(XmppStream stream, string jid, string state) {
+        Message.Stanza message = new Message.Stanza();
+        message.to = jid;
+        message.type_ = Message.Stanza.TYPE_CHAT;
+        message.stanza.put_node(new StanzaNode.build(state, NS_URI).add_self_xmlns());
+        Message.Module.get_module(stream).send_message(stream, message);
+    }
+
+    public override void attach(XmppStream stream) {
+        ServiceDiscovery.Module.require(stream);
+        ServiceDiscovery.Module.get_module(stream).add_feature(stream, NS_URI);
+        Message.Module.get_module(stream).pre_send_message.connect(on_pre_send_message);
+        Message.Module.get_module(stream).received_message.connect(on_received_message);
+    }
+
+    public override void detach(XmppStream stream) {
+        Message.Module.get_module(stream).pre_send_message.disconnect(on_pre_send_message);
+        Message.Module.get_module(stream).received_message.disconnect(on_received_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 on_pre_send_message(XmppStream stream, Message.Stanza message) {
+        if (message.body == null) return;
+        if (message.type_ != Message.Stanza.TYPE_CHAT) return;
+        message.stanza.put_node(new StanzaNode.build(STATE_ACTIVE, NS_URI).add_self_xmlns());
+    }
+
+    private void on_received_message(XmppStream stream, Message.Stanza message) {
+        if (!message.is_error()) {
+            ArrayList<StanzaNode> nodes = message.stanza.get_all_subnodes();
+            foreach (StanzaNode node in nodes) {
+                if (node.ns_uri == NS_URI &&
+                    node.name in STATES) {
+                    chat_state_received(stream, message.from, node.name);
+                }
+            }
+        }
+    }
+}
+
+}