From a59f728bdd7b81964a460b96b6c56da0d9dfda01 Mon Sep 17 00:00:00 2001
From: fiaxh <git@mx.ax.lt>
Date: Sat, 12 Aug 2017 23:14:50 +0200
Subject: Stream Management

---
 .../src/module/xep/0198_stream_management.vala     | 112 +++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 xmpp-vala/src/module/xep/0198_stream_management.vala

(limited to 'xmpp-vala/src/module/xep/0198_stream_management.vala')

diff --git a/xmpp-vala/src/module/xep/0198_stream_management.vala b/xmpp-vala/src/module/xep/0198_stream_management.vala
new file mode 100644
index 00000000..03be907c
--- /dev/null
+++ b/xmpp-vala/src/module/xep/0198_stream_management.vala
@@ -0,0 +1,112 @@
+using Xmpp.Core;
+
+namespace Xmpp.Xep.StreamManagement  {
+
+public const string NS_URI = "urn:xmpp:sm:3";
+
+public class Module : XmppStreamNegotiationModule {
+    public static ModuleIdentity<Module> IDENTITY = new ModuleIdentity<Module>(NS_URI, "0313_message_archive_management");
+
+    public int h_inbound { get; private set; default=0; }
+    public string? session_id { get; set; default=null; }
+    public Gee.List<XmppStreamFlag> flags = null;
+
+    public override void attach(XmppStream stream) {
+        stream.get_module(Bind.Module.IDENTITY).bound_to_resource.connect(check_enable);
+        stream.received_features_node.connect(check_resume);
+
+        stream.received_nonza.connect(on_received_nonza);
+        stream.received_message_stanza.connect(on_stanza_received);
+        stream.received_presence_stanza.connect(on_stanza_received);
+        stream.received_iq_stanza.connect(on_stanza_received);
+    }
+
+    public override void detach(XmppStream stream) { }
+
+    public static void require(XmppStream stream) {
+        if (stream.get_module(IDENTITY) == null) stream.add_module(new PrivateXmlStorage.Module());
+    }
+
+    public override bool mandatory_outstanding(XmppStream stream) { return false; }
+
+    public override bool negotiation_active(XmppStream stream) {
+        return stream.has_flag(Flag.IDENTITY) && !stream.get_flag(Flag.IDENTITY).finished;
+    }
+
+    public override string get_ns() { return NS_URI; }
+    public override string get_id() { return IDENTITY.id; }
+
+    private void on_stanza_received(XmppStream stream, StanzaNode node) {
+        lock (h_inbound) h_inbound++;
+    }
+
+    private void check_resume(XmppStream stream) {
+        if (stream_has_sm_feature(stream) && session_id != null) {
+            Tls.Flag? tls_flag = stream.get_flag(Tls.Flag.IDENTITY);
+            if (tls_flag != null && tls_flag.finished) {
+                StanzaNode node = new StanzaNode.build("resume", NS_URI).add_self_xmlns()
+                    .put_attribute("h", h_inbound.to_string())
+                    .put_attribute("previd", session_id);
+                stream.write(node);
+                stream.add_flag(new Flag());
+            }
+        }
+    }
+
+    private void check_enable(XmppStream stream) {
+        if (stream_has_sm_feature(stream) && session_id == null) {
+            StanzaNode node = new StanzaNode.build("enable", NS_URI).add_self_xmlns().put_attribute("resume", "true");
+            stream.write(node);
+            stream.add_flag(new Flag());
+        }
+    }
+
+    private void on_received_nonza(XmppStream stream, StanzaNode node) {
+        if (node.ns_uri == NS_URI) {
+            if (node.name == "r") {
+                send_ack(stream);
+            } else if (node.name == "a") {
+                handle_ack(stream, node);
+            } else if (node.name in new string[]{"enabled", "resumed", "failed"}) {
+                stream.get_flag(Flag.IDENTITY).finished = true;
+
+                if (node.name == "enabled") {
+                    lock(h_inbound) h_inbound = 0;
+                    session_id = node.get_attribute("id", NS_URI);
+                    flags = stream.flags;
+                } else if (node.name == "resumed") {
+                    foreach (XmppStreamFlag flag in flags) {
+                        stream.add_flag(flag);
+                    }
+                    stream.negotiation_complete = true;
+                } else if (node.name == "failed") {
+                    stream.received_features_node(stream);
+                    session_id = null;
+                }
+            }
+        }
+    }
+
+    private void send_ack(XmppStream stream) {
+        StanzaNode node = new StanzaNode.build("a", NS_URI).add_self_xmlns().put_attribute("h", h_inbound.to_string());
+        stream.write(node);
+    }
+
+    private void handle_ack(XmppStream stream, StanzaNode node) {
+
+    }
+
+    private bool stream_has_sm_feature(XmppStream stream) {
+        return stream.features.get_subnode("sm", NS_URI) != null;
+    }
+}
+
+public class Flag : XmppStreamFlag {
+    public static FlagIdentity<Flag> IDENTITY = new FlagIdentity<Flag>(NS_URI, "stream_management");
+    public bool finished = false;
+
+    public override string get_ns() { return NS_URI; }
+    public override string get_id() { return IDENTITY.id; }
+}
+
+}
-- 
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