From 63439cd206aaf3548228e915bd1744389cd2fc54 Mon Sep 17 00:00:00 2001
From: Alexandre Jousset <mid@gtmp.org>
Date: Sun, 12 Nov 2023 13:58:01 +0100
Subject: XEP-0215: management of the field `expires`

Add a field in `Xmpp.Xep.ExternalServiceDiscovery` to keep track
of the `expires` TURN service value and use it (divided by 2) to
restart periodically the external services discovery.
---
 plugins/ice/src/plugin.vala                           | 19 +++++++++++++++++--
 .../module/xep/0215_external_service_discovery.vala   |  4 ++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/plugins/ice/src/plugin.vala b/plugins/ice/src/plugin.vala
index ec4fe9cb..17090d26 100644
--- a/plugins/ice/src/plugin.vala
+++ b/plugins/ice/src/plugin.vala
@@ -22,10 +22,10 @@ public class Dino.Plugins.Ice.Plugin : RootInterface, Object {
                 stream.get_module(JingleRawUdp.Module.IDENTITY).set_local_ip_address_handler(get_local_ip_addresses);
             }
         });
-        app.stream_interactor.stream_negotiated.connect(on_stream_negotiated);
+        app.stream_interactor.stream_negotiated.connect(external_discovery_refresh_services);
     }
 
-    private async void on_stream_negotiated(Account account, XmppStream stream) {
+    private async void external_discovery_refresh_services(Account account, XmppStream stream) {
         Module? ice_udp_module = stream.get_module(JingleIceUdp.Module.IDENTITY) as Module;
         if (ice_udp_module == null) return;
         Gee.List<Xep.ExternalServiceDiscovery.Service> services = yield ExternalServiceDiscovery.request_services(stream);
@@ -59,6 +59,21 @@ public class Dino.Plugins.Ice.Plugin : RootInterface, Object {
             ice_udp_module.stun_ip = ip.to_string();
             ice_udp_module.stun_port = 7886;
         }
+
+        if (ice_udp_module.turn_service != null) {
+            DateTime? expires = ice_udp_module.turn_service.expires;
+            if (expires != null) {
+                uint delay = (uint) (expires.to_unix() - new DateTime.now_utc().to_unix()) / 2;
+
+                debug("Next server external service discovery in %us (because of TURN credentials' expiring time)", delay);
+
+                Timeout.add_seconds(delay, () => {
+                    if (app.stream_interactor.connection_manager.get_state(account) != ConnectionManager.ConnectionState.CONNECTED) return false;
+                    on_stream_negotiated.begin(account, stream);
+                    return false;
+                });
+            }
+        }
     }
 
     public void shutdown() {
diff --git a/xmpp-vala/src/module/xep/0215_external_service_discovery.vala b/xmpp-vala/src/module/xep/0215_external_service_discovery.vala
index 07c3f71c..6d41a288 100644
--- a/xmpp-vala/src/module/xep/0215_external_service_discovery.vala
+++ b/xmpp-vala/src/module/xep/0215_external_service_discovery.vala
@@ -25,6 +25,9 @@ namespace Xmpp.Xep.ExternalServiceDiscovery {
 
             service.username = service_node.get_attribute("username", NS_URI);
             service.password = service_node.get_attribute("password", NS_URI);
+            string? expires_str = service_node.get_attribute("expires", NS_URI);
+            if (expires_str != null) service.expires = DateTimeProfiles.parse_string(expires_str);
+
             service.transport = service_node.get_attribute("transport", NS_URI);
             service.name = service_node.get_attribute("name", NS_URI);
             string? restricted_str = service_node.get_attribute("restricted", NS_URI);
@@ -41,6 +44,7 @@ namespace Xmpp.Xep.ExternalServiceDiscovery {
 
         public string username { get; set; }
         public string password { get; set; }
+        public DateTime? expires { get; set; }
 
         public string transport { get; set; }
         public string name { get; set; }
-- 
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