From fde6f6db66ccc15f83061c065b31ee01a9145f56 Mon Sep 17 00:00:00 2001
From: Matthew Wild <mwild1@gmail.com>
Date: Sat, 4 Oct 2008 02:15:13 +0100
Subject: Resource binding, XMPP sessions (whatever they're for...)

---
 plugins/mod_saslauth.lua | 63 ++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 61 insertions(+), 2 deletions(-)

diff --git a/plugins/mod_saslauth.lua b/plugins/mod_saslauth.lua
index dc6f3645..7eed8f35 100644
--- a/plugins/mod_saslauth.lua
+++ b/plugins/mod_saslauth.lua
@@ -1,14 +1,17 @@
 
 local st = require "util.stanza";
 local send = require "core.sessionmanager".send_to_session;
+local sm_bind_resource = require "core.sessionmanager".bind_resource;
 
 local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
-local t_concat = table.concat;
+local t_concat, t_insert = table.concat, table.insert;
 local tostring = tostring;
 
 local log = require "util.logger".init("mod_saslauth");
 
 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
+local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
+local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
 
 local new_connhandler = require "net.connhandlers".new;
 local new_sasl = require "util.sasl".new;
@@ -50,4 +53,60 @@ add_handler("c2s_unauthed", "auth",
 				error("Client tried to negotiate SASL again", 0);
 			end
 			
-		end);
\ No newline at end of file
+		end);
+		
+add_event_hook("stream-features", 
+					function (session, features)												
+						if not session.username then
+							t_insert(features, "<mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>");
+								t_insert(features, "<mechanism>PLAIN</mechanism>");
+							t_insert(features, "</mechanisms>");
+						else
+							t_insert(features, "<bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'><required/></bind>");
+							t_insert(features, "<session xmlns='urn:ietf:params:xml:ns:xmpp-session'/>");
+						end
+						--send [[<register xmlns="http://jabber.org/features/iq-register"/> ]]
+					end);
+					
+add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind", 
+		function (session, stanza)
+			log("debug", "Client tried to bind to a resource");
+			local resource;
+			if stanza.attr.type == "set" then
+				local bind = stanza.tags[1];
+				
+				if bind and bind.attr.xmlns == xmlns_bind then
+					resource = bind:child_with_name("resource");
+					if resource then
+						resource = resource[1];
+					end
+				end
+			end
+			local success, err = sm_bind_resource(session, resource);
+			if not success then
+				local reply = st.reply(stanza);
+				reply.attr.type = "error";
+				if err == "conflict" then
+					reply:tag("error", { type = "modify" })
+						:tag("conflict", { xmlns = xmlns_stanzas });
+				elseif err == "constraint" then
+					reply:tag("error", { type = "cancel" })
+						:tag("resource-constraint", { xmlns = xmlns_stanzas });
+				elseif err == "auth" then
+					reply:tag("error", { type = "cancel" })
+						:tag("not-allowed", { xmlns = xmlns_stanzas });
+				end
+				send(session, reply);
+			else
+				local reply = st.reply(stanza);
+				reply:tag("bind", { xmlns = xmlns_bind})
+					:tag("jid"):text(session.full_jid);
+				send(session, reply);
+			end
+		end);
+		
+add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session", 
+		function (session, stanza)
+			log("debug", "Client tried to bind to a resource");
+			send(session, st.reply(stanza));
+		end);
-- 
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