# HG changeset patch
# User Waqas Hussain <waqas20@gmail.com>
# Date 1230700602 -18000
# Node ID 27f76695f43bf98dd91a99fd9f547d0c3ab1aaae
# Parent  09e0e9c722a301373f2b78256657beea93bcde15
Initial mod_muc: XEP-0045: Multi-User Chat

diff -r 09e0e9c722a3 -r 27f76695f43b plugins/mod_muc.lua
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/mod_muc.lua	Wed Dec 31 10:16:42 2008 +0500
@@ -0,0 +1,218 @@
+
+
+local register_component = require "core.componentmanager".register_component;
+local jid_split = require "util.jid".split;
+local jid_bare = require "util.jid".bare;
+local st = require "util.stanza";
+local log = require "util.logger".init("mod_muc");
+local multitable_new = require "util.multitable".new;
+
+local muc_domain = "conference."..module:get_host();
+local muc_name = "MUCMUCMUC!!!";
+
+local rooms = multitable_new();
+local jid_nick = multitable_new();
+local rooms_info = multitable_new();
+
+local component;
+
+function getUsingPath(stanza, path, getText)
+	local tag = stanza;
+	for _, name in ipairs(path) do
+		if type(tag) ~= 'table' then return; end
+		tag = tag:child_with_name(name);
+	end
+	if tag and getText then tag = table.concat(tag); end
+	return tag;
+end
+function getTag(stanza, path) return getUsingPath(stanza, path); end
+function getText(stanza, path) return getUsingPath(stanza, path, true); end
+
+function get_disco_info(stanza)
+	return st.iq({type='result', id=stanza.attr.id, from=muc_domain, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#info")
+		:tag("identity", {category='conference', type='text', name=muc_name}):up()
+		:tag("feature", {var="http://jabber.org/protocol/muc"}); -- TODO cache disco reply
+end
+function get_disco_items(stanza)
+	local reply = st.iq({type='result', id=stanza.attr.id, from=muc_domain, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#items");
+	for room in pairs(rooms_info:get()) do
+		reply:tag("item", {jid=room, name=rooms_info:get(room, "name")}):up();
+	end
+	return reply; -- TODO cache disco reply
+end
+function get_room_disco_info(stanza)
+	return st.iq({type='result', id=stanza.attr.id, from=stanza.attr.to, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#info")
+		:tag("identity", {category='conference', type='text', name=rooms_info:get(stanza.attr.to, "name")}):up()
+		:tag("feature", {var="http://jabber.org/protocol/muc"}); -- TODO cache disco reply
+end
+function get_room_disco_items(stanza)
+	return st.iq({type='result', id=stanza.attr.id, from=stanza.attr.to, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#items");
+end -- TODO allow non-private rooms
+
+function broadcast_presence(type, from, room, code)
+	local data = rooms:get(room, from);
+	local stanza = st.presence({type=type, from=from})
+		:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
+		:tag("item", {affiliation=data.affiliation, role=data.role}):up();
+	if code then
+		stanza:tag("status", {code=code}):up();
+	end
+	local me;
+	local r = rooms:get(room);
+	if r then
+		for occupant, o_data in pairs(r) do
+			if occupant ~= from then
+				stanza.attr.to = o_data.jid;
+				core_route_stanza(component, stanza);
+			else
+				me = o_data.jid;
+			end
+		end
+	end
+	if me then
+		stanza:tag("status", {code='110'});
+		stanza.attr.to = me;
+		core_route_stanza(component, stanza);
+	end
+end
+function broadcast_message(from, room, subject, body)
+	local stanza = st.message({type='groupchat', from=from});
+	if subject then stanza:tag('subject'):text(subject):up(); end
+	if body then stanza:tag('body'):text(body):up(); end
+	local r = rooms:get(room);
+	if r then
+		for occupant, o_data in pairs(r) do
+			stanza.attr.to = o_data.jid;
+			core_route_stanza(component, stanza);
+		end
+	end
+end
+
+function handle_to_occupant(origin, stanza) -- PM, vCards, etc
+	local from, to = stanza.attr.from, stanza.attr.to;
+	local room = jid_bare(to);
+	local current_nick = jid_nick:get(from, room);
+	local type = stanza.attr.type;
+	if stanza.name == "presence" then
+		if type == "error" then -- error, kick em out!
+			local data = rooms:get(room, to);
+			data.role = 'none';
+			broadcast_presence('unavailable', to, room); -- TODO also add <status>This participant is kicked from the room because he sent an error presence: badformed error stanza</status>
+			rooms:remove(room, to);
+			jid_nick:remove(from, room);
+		elseif type == "unavailable" then -- unavailable
+			if current_nick == to then
+				local data = rooms:get(room, to);
+				data.role = 'none';
+				broadcast_presence('unavailable', to, room);
+				rooms:remove(room, to);
+				jid_nick:remove(from, room);
+			end -- TODO else do nothing?
+		elseif not type then -- available
+			if current_nick then
+				if current_nick == to then -- simple presence
+					-- TODO broadcast
+				else -- change nick
+					if rooms:get(room, to) then
+						origin.send(st.error_reply(stanza, "cancel", "conflict"));
+					else
+						local data = rooms:get(room, current_nick);
+						broadcast_presence('unavailable', current_nick, room, '303');
+						rooms:remove(room, current_nick);
+						rooms:set(room, to, data);
+						jid_nick:set(from, room, to);
+						broadcast_presence(nil, to, room);
+					end
+				end
+			else -- enter room
+				if rooms:get(room, to) then
+					origin.send(st.error_reply(stanza, "cancel", "conflict"));
+				else
+					local data = {affiliation='none', role='participant', jid=from};
+					rooms:set(room, to, data);
+					jid_nick:set(from, room, to);
+					local r = rooms:get(room);
+					if r then
+						for occupant, o_data in pairs(r) do
+							if occupant ~= from then
+								local pres = st.presence({to=from, from=occupant})
+									:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
+									:tag("item", {affiliation=o_data.affiliation, role=o_data.role}):up();
+								core_route_stanza(component, pres);
+							end
+						end
+					end
+					broadcast_presence(nil, to, room);
+				end
+			end
+		elseif type ~= 'result' then -- bad type
+			origin.send(st.error_reply(stanza, "modify", "bad-request")); -- FIXME correct error?
+		end
+	elseif stanza.name == "message" and type == "groupchat" then
+		-- groupchat messages not allowed in PM
+		origin.send(st.error_reply(stanza, "modify", "bad-request"));
+	else
+		origin.send(st.error_reply(stanza, "cancel", "not-implemented", "Private stanzas not implemented")); -- TODO route private stanza
+	end
+end
+
+function handle_to_room(origin, stanza) -- presence changes and groupchat messages, along with disco/etc
+	local type = stanza.attr.type;
+	if stanza.name == "iq" and type == "get" then -- disco requests
+		local xmlns = stanza.tags[1].attr.xmlns;
+		if xmlns == "http://jabber.org/protocol/disco#info" then
+			origin.send(get_room_disco_info(stanza));
+		elseif xmlns == "http://jabber.org/protocol/disco#items" then
+			origin.send(get_room_disco_items(stanza));
+		else
+			origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
+		end
+	elseif stanza.name == "message" and type == "groupchat" then
+		local from, to = stanza.attr.from, stanza.attr.to;
+		local room = jid_bare(to);
+		local current_nick = jid_nick:get(from, room);
+		if not current_nick then -- not in room
+			origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
+		else
+			broadcast_message(current_nick, room, getText(stanza, {"subject"}), getText(stanza, {"body"}));
+		end
+	else
+		if type == "error" or type == "result" then return; end
+		origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
+	end
+end
+
+function handle_to_domain(origin, stanza)
+	local type = stanza.attr.type;
+	if type == "error" or type == "result" then return; end
+	if stanza.name == "iq" and type == "get" then
+		local xmlns = stanza.tags[1].attr.xmlns;
+		if xmlns == "http://jabber.org/protocol/disco#info" then
+			origin.send(get_disco_info(stanza));
+		elseif xmlns == "http://jabber.org/protocol/disco#items" then
+			origin.send(get_disco_items(stanza));
+		else
+			origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- TODO disco/etc
+		end
+	else
+		origin.send(st.error_reply(stanza, "cancel", "service-unavailable", "The muc server doesn't deal with messages and presence directed at it"));
+	end
+end
+
+component = register_component(muc_domain, function(origin, stanza)
+	local to_node, to_host, to_resource = jid_split(stanza.attr.to);
+	if stanza.name == "presence" and stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
+		if type == "error" or type == "result" then return; end
+		origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- FIXME what's appropriate?
+	elseif to_resource and not to_node then
+		if type == "error" or type == "result" then return; end
+		origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- host/resource
+	elseif to_resource then
+		handle_to_occupant(origin, stanza);
+	elseif to_node then
+		handle_to_room(origin, stanza)
+	else -- to the main muc domain
+		if type == "error" or type == "result" then return; end
+		handle_to_domain(origin, stanza);
+	end
+end);