From ef38f2d0622260df46a86ca4a6d000c57e197823 Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Sun, 8 Sep 2019 19:45:39 +0200
Subject: mod_s2s_bidi: Enables bi-directional streams via XEP-0288

---
 plugins/mod_s2s_bidi.lua | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 plugins/mod_s2s_bidi.lua

(limited to 'plugins')

diff --git a/plugins/mod_s2s_bidi.lua b/plugins/mod_s2s_bidi.lua
new file mode 100644
index 00000000..67a48d8d
--- /dev/null
+++ b/plugins/mod_s2s_bidi.lua
@@ -0,0 +1,38 @@
+-- Prosody IM
+-- Copyright (C) 2019 Kim Alvefur
+--
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+
+local st = require "util.stanza";
+
+local xmlns_bidi_feature = "urn:xmpp:features:bidi"
+local xmlns_bidi = "urn:xmpp:bidi";
+
+module:hook("s2s-stream-features", function(event)
+	local origin, features = event.origin, event.features;
+	if origin.type == "s2sin_unauthed" then
+		features:tag("bidi", { xmlns = xmlns_bidi_feature }):up();
+	end
+end);
+
+module:hook_tag("http://etherx.jabber.org/streams", "features", function (session, stanza)
+	if session.type == "s2sout_unauthed" then
+		local bidi = stanza:get_child("bidi", xmlns_bidi_feature);
+		if bidi then
+			session.incoming = true;
+			session.log("debug", "Requesting bidirectional stream");
+			session.sends2s(st.stanza("bidi", { xmlns = xmlns_bidi }));
+		end
+	end
+end, 200);
+
+module:hook_tag("urn:xmpp:bidi", "bidi", function(session)
+	if session.type == "s2sin_unauthed" then
+		session.log("debug", "Requested bidirectional stream");
+		session.outgoing = true;
+		return true;
+	end
+end);
+
-- 
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