local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls';

local starttls_attr = { xmlns = xmlns_starttls };

local starttls_proceed = st.stanza("proceed", starttls_attr);

local starttls_failure = st.stanza("failure", starttls_attr);

local c2s_feature = st.stanza("starttls", starttls_attr);

local s2s_feature = st.stanza("starttls", starttls_attr);

if secure_auth_only then c2s_feature:tag("required"):up(); end

if secure_s2s_only then s2s_feature:tag("required"):up(); end

-- Hook <starttls/>

		(origin.sends2s or origin.send)(starttls_proceed);

		(origin.sends2s or origin.send)(starttls_failure);

-- Advertize stream feature

module:add_event_hook("stream-features", function(session, features)

	if not session.username and session.conn.starttls then

		features:add_child(c2s_feature);

	end

end);

module:hook("s2s-stream-features", function(event)

	local session, features = event.session, event.features;

	if session.to_host and session.type ~= "s2sin" and session.conn.starttls then

		features:add_child(s2s_feature);

	end

end);

module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza)

	module:log("debug", "Received features element");

	if session.conn.starttls and stanza:child_with_ns(xmlns_starttls) then

		module:log("%s is offering TLS, taking up the offer...", session.to_host);

		session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");

		return true;

	end

end, 500);

module:hook_stanza(xmlns_starttls, "proceed", function (session, stanza)

	module:log("debug", "Proceeding with TLS on s2sout...");

	session:reset_stream();

	local ssl_ctx = session.from_host and hosts[session.from_host].ssl_ctx or global_ssl_ctx;

	session.conn:starttls(ssl_ctx, true);

	session.secure = false;

	return true;

end);