Changeset

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_delay/README.markdown	Tue Nov 22 21:15:01 2016 +0100
@@ -0,0 +1,31 @@
+---
+labels:
+- 'Stage-Alpha'
+summary: Add "XEP-0203 Delayed Delivery"-tags to every message stanza
+...
+
+Introduction
+============
+
+This module adds "Delayed Delivery"-tags to every message stanza passing
+the server containing the current time on that server.
+
+This adds accurate message timings even when the message is delayed by slow networks
+on the receiving client or by any event.
+
+Compatibility
+=============
+
+  ----- -----------------------------------------------------
+  0.10  Works
+  ----- -----------------------------------------------------
+
+
+Clients
+=======
+
+Clients that support XEP-0203 (among others):
+
+-   Gajim
+-   Conversations
+-   Yaxim

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_delay/mod_delay.lua	Tue Nov 22 21:15:01 2016 +0100
@@ -0,0 +1,26 @@
+local add_filter = require "util.filters".add_filter;
+local remove_filter = require "util.filters".remove_filter;
+local datetime = require "util.datetime";
+
+local xmlns_delay = "urn:xmpp:delay";
+
+-- Raise an error if the modules has been loaded as a component in prosody's config
+if module:get_host_type() == "component" then
+	error(module.name.." should NOT be loaded as a component, check out http://prosody.im/doc/components", 0);
+end
+
+local add_delay = function(stanza, session)
+	if stanza and stanza.name == "message" and stanza:get_child("delay", xmlns_delay) == nil then
+		-- session.log("debug", "adding delay to message %s", tostring(stanza));
+		stanza = stanza:tag("delay", { xmlns = xmlns_delay, from = session.host, stamp = datetime.datetime()});
+	end
+	return stanza;
+end
+
+module:hook("resource-bind", function(event)
+	add_filter(event.session, "stanzas/in", add_delay, 1);
+end);
+
+module:hook("pre-resource-unbind", function (event)
+	remove_filter(event.session, "stanzas/in", add_delay);
+end);