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 -- Prosody IM v0.4

 -- Copyright (C) 2008-2009 Matthew Wild

 -- Copyright (C) 2008-2009 Waqas Hussain

 -- 

 -- This project is MIT/X11 licensed. Please see the

 -- COPYING file in the source package for more information.

 --

 local log = require "util.logger".init("stanzarouter")

 local hosts = _G.hosts;

 local st = require "util.stanza";

 local send_s2s = require "core.s2smanager".send_to_host;

 local user_exists = require "core.usermanager".user_exists;

 local rostermanager = require "core.rostermanager";

 local offlinemanager = require "core.offlinemanager";

 local modules_handle_stanza = require "core.modulemanager".handle_stanza;

 local component_handle_stanza = require "core.componentmanager".handle_stanza;

 local tostring = tostring;

 local t_insert = table.insert;

 local pairs = pairs;

 local ipairs = ipairs;

 local jid_split = require "util.jid".split;

 local jid_prepped_split = require "util.jid".prepped_split;

 local fire_event = prosody.events.fire_event;

 local select_best_resources;

 function core_process_stanza(origin, stanza)

 	(origin.log or log)("debug", "Received[%s]: %s", origin.type, stanza:top_tag())

 	-- Currently we guarantee every stanza to have an xmlns, should we keep this rule?

 	if not stanza.attr.xmlns then stanza.attr.xmlns = "jabber:client"; end

 	-- TODO verify validity of stanza (as well as JID validity)

 	if stanza.attr.type == "error" and #stanza.tags == 0 then return; end -- TODO invalid stanza, log

 	if stanza.name == "iq" then

 		if (stanza.attr.type == "set" or stanza.attr.type == "get") and #stanza.tags ~= 1 then

 			origin.send(st.error_reply(stanza, "modify", "bad-request"));

 			return;

 		end

 	end

 	if origin.type == "c2s" then

 		if not origin.full_jid

 			and not(stanza.name == "iq" and stanza.attr.type == "set" and stanza.tags[1] and stanza.tags[1].name == "bind"

 					and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then

 			-- authenticated client isn't bound and current stanza is not a bind request

 			origin.send(st.error_reply(stanza, "auth", "not-authorized")); -- FIXME maybe allow stanzas to account or server

 			return;

 		end

 		-- TODO also, stanzas should be returned to their original state before the function ends

 		stanza.attr.from = origin.full_jid;

 	end

 	local to, xmlns = stanza.attr.to, stanza.attr.xmlns;

 	local from = stanza.attr.from;

 	local node, host, resource;

 	local from_node, from_host, from_resource;

 	local to_bare, from_bare;

 	if to then

 		if full_sessions[to] or bare_sessions[to] or hosts[to] then

 			node, host = jid_split(to); -- TODO only the host is needed, optimize

 		else

 			node, host, resource = jid_prepped_split(to);

 			if not host then

 				log("warn", "Received stanza with invalid destination JID: %s", to);

 				if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then

 					origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The destination address is invalid: "..to));

 				end

 				return;

 			end

 			to_bare = node and (node.."@"..host) or host; -- bare JID

 			if resource then to = to_bare.."/"..resource; else to = to_bare; end

 			stanza.attr.to = to;

 		end

 	end

 	if from and not origin.full_jid then

 		-- We only stamp the 'from' on c2s stanzas, so we still need to check validity

 		from_node, from_host, from_resource = jid_prepped_split(from);

 		if not from_host then

 			log("warn", "Received stanza with invalid source JID: %s", from);

 			if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then

 				origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The source address is invalid: "..from));

 			end

 			return;

 		end

 		from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID

 		if from_resource then from = from_bare.."/"..from_resource; else from = from_bare; end

 		stanza.attr.from = from;

 	end

 	--[[if to and not(hosts[to]) and not(hosts[to_bare]) and (hosts[host] and hosts[host].type ~= "local") then -- not for us?

 		log("warn", "stanza recieved for a non-local server");

 		return; -- FIXME what should we do here?

 	end]] -- FIXME

 	if (origin.type == "s2sin" or origin.type == "c2s" or origin.type == "component") and xmlns == "jabber:client" then

 		if origin.type == "s2sin" and not origin.dummy then

 			local host_status = origin.hosts[from_host];

 			if not host_status or not host_status.authed then -- remote server trying to impersonate some other server?

 				log("warn", "Received a stanza claiming to be from %s, over a stream authed for %s!", from_host, origin.from_host);

 				return; -- FIXME what should we do here? does this work with subdomains?

 			end

 		end

 		core_post_stanza(origin, stanza);

 	else

 		local h = hosts[stanza.attr.to or origin.host or origin.to_host];

 		if h then

 			local event;

 			if stanza.attr.xmlns == "jabber:client" then

 				if stanza.name == "iq" and (stanza.attr.type == "set" or stanza.attr.type == "get") then

 					event = "stanza/iq/"..stanza.tags[1].attr.xmlns..":"..stanza.tags[1].name;

 				else

 					event = "stanza/"..stanza.name;

 				end

 			else

 				event = "stanza/"..stanza.attr.xmlns..":"..stanza.name;

 			end

 			if h.events.fire_event(event, {origin = origin, stanza = stanza}) then return; end

 		end

 		if host and not hosts[host] then host = nil; end -- workaround for a Pidgin bug which sets 'to' to the SRV result

 		modules_handle_stanza(host or origin.host or origin.to_host, origin, stanza);

 	end

 end

 function core_post_stanza(origin, stanza)

 	local to = stanza.attr.to;

 	local node, host, resource = jid_split(to);

 	local to_bare = node and (node.."@"..host) or host; -- bare JID

 	local to_type;

 	if node then

 		if resource then

 			to_type = '/full';

 		else

 			to_type = '/bare';

 			if node == origin.username and host == origin.host then

 				stanza.attr.to = nil;

 			end

 		end

 	else

 		if host then

 			to_type = '/host';

 		else

 			to_type = '/bare';

 		end

 	end

 	local event_data = {origin=origin, stanza=stanza};

 	if origin.full_jid then -- c2s connection

 		if hosts[origin.host].events.fire_event('pre-'..stanza.name..to_type, event_data) then return; end -- do preprocessing

 	end

 	local h = hosts[to_bare] or hosts[host or origin.host];

 	if h then

 		if h.type == "component" then

 			component_handle_stanza(origin, stanza);

 			return;

 		else

 			if h.events.fire_event(stanza.name..to_type, event_data) then return; end -- do processing

 		end

 	end

 	if host and fire_event(host.."/"..stanza.name, event_data) then

 		-- event handled

 	elseif stanza.name == "presence" and origin.host and fire_event(origin.host.."/"..stanza.name, event_data) then

 		-- event handled

 	elseif not to then

 		modules_handle_stanza(host or origin.host or origin.to_host, origin, stanza);

 	elseif hosts[to] and hosts[to].type == "local" then -- directed at a local server

 		modules_handle_stanza(host or origin.host or origin.to_host, origin, stanza);

 	elseif hosts[to_bare] and hosts[to_bare].type == "component" then -- hack to allow components to handle node@server

 		component_handle_stanza(origin, stanza);

 	elseif hosts[host] and hosts[host].type == "component" then -- directed at a component

 		component_handle_stanza(origin, stanza);

 	elseif hosts[host] and hosts[host].type == "local" and stanza.name == "iq" and not resource then -- directed at bare JID

 		modules_handle_stanza(host or origin.host or origin.to_host, origin, stanza);

 	else

 		core_route_stanza(origin, stanza);

 	end

 end

 function core_route_stanza(origin, stanza)

 	-- Hooks

 	--- ...later

 	-- Deliver

 	local to = stanza.attr.to;

 	local node, host, resource = jid_split(to);

 	local to_bare = node and (node.."@"..host) or host; -- bare JID

 	local from = stanza.attr.from;

 	local from_node, from_host, from_resource = jid_split(from);

 	local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID

 	-- Auto-detect origin if not specified

 	origin = origin or hosts[from_host];

 	if not origin then return false; end

 	if hosts[to_bare] and hosts[to_bare].type == "component" then -- hack to allow components to handle node@server

 		return component_handle_stanza(origin, stanza);

 	elseif hosts[host] and hosts[host].type == "component" then -- directed at a component

 		return component_handle_stanza(origin, stanza);

 	end

 	if stanza.name == "presence" and (stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" and stanza.attr.type ~= "error") then resource = nil; end

 	local host_session = hosts[host]

 	if host_session and host_session.type == "local" then

 		-- Local host

 		local user = host_session.sessions[node];

 		if user then

 			local res = user.sessions[resource];

 			if res then -- resource is online...

 				res.send(stanza); -- Yay \o/

 			else

 				-- if we get here, resource was not specified or was unavailable

 				if stanza.name == "presence" then

 					if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" and stanza.attr.type ~= "error" then

 						-- inbound presence subscriptions and probes, already handled, so should never get here

 					elseif not resource then -- sender is available or unavailable or error

 						for _, session in pairs(user.sessions) do -- presence broadcast to all user resources.

 							if session.full_jid then -- FIXME should this be just for available resources? Do we need to check subscription?

 								stanza.attr.to = session.full_jid; -- reset at the end of function

 								session.send(stanza);

 							end

 						end

 					end

 				elseif stanza.name == "message" then -- select a resource to recieve message

 					stanza.attr.to = to_bare;

 					if stanza.attr.type == 'headline' then

 						for _, session in pairs(user.sessions) do -- find resource with greatest priority

 							if session.presence and session.priority >= 0 then

 								session.send(stanza);

 							end

 						end

 					elseif stanza.attr.type == 'groupchat' then

 						-- Groupchat message sent to offline resource

 						origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));

 					else

 						local count = 0;

 						for _, session in ipairs(select_best_resources(user)) do

 							session.send(stanza);

 							count = count + 1;

 						end

 						if count == 0 and (stanza.attr.type == "chat" or stanza.attr.type == "normal" or not stanza.attr.type) then

 							offlinemanager.store(node, host, stanza);

 							-- TODO deal with storage errors

 						end

 					end

 				elseif stanza.attr.type == "get" or stanza.attr.type == "set" then

 					origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));

 				end

 			end

 		else

 			-- user not online

 			if user_exists(node, host) then

 				if stanza.name == "presence" then

 					if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" and stanza.attr.type ~= "error" then

 						-- inbound presence subscriptions and probes, already handled, so should never get here

 					else

 						-- TODO send unavailable presence or unsubscribed

 					end

 				elseif stanza.name == "message" then -- FIXME if full jid, then send out to resources with highest priority

 					stanza.attr.to = to_bare; -- TODO not in RFC, but seems obvious. Should discuss on the mailing list.

 					if stanza.attr.type == "chat" or stanza.attr.type == "normal" or not stanza.attr.type then

 						offlinemanager.store(node, host, stanza);

 						-- FIXME don't store messages with only chat state notifications

 					elseif stanza.attr.type == "groupchat" then

 						local reply = st.error_reply(stanza, "cancel", "service-unavailable");

 						reply.attr.from = to;

 						origin.send(reply);

 					end

 					-- TODO allow configuration of offline storage

 					-- TODO send error if not storing offline

 				elseif stanza.name == "iq" and (stanza.attr.type == "get" or stanza.attr.type == "set") then

 					origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));

 				end

 			else -- user does not exist

 				-- TODO we would get here for nodeless JIDs too. Do something fun maybe? Echo service? Let plugins use xmpp:server/resource addresses?

 				if stanza.name == "presence" then

 					local t = stanza.attr.type;

 					if t == "subscribe" or t == "probe" then

 						origin.send(st.presence({from = to_bare, to = from_bare, type = "unsubscribed"}));

 					end

 					-- else ignore

 				elseif stanza.attr.type ~= "error" and (stanza.name ~= "iq" or stanza.attr.type ~= "result") then

 					origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));

 				end

 			end

 		end

 	elseif origin.type == "c2s" then

 		-- Remote host

 		local xmlns = stanza.attr.xmlns;

 		--stanza.attr.xmlns = "jabber:server";

 		stanza.attr.xmlns = nil;

 		log("debug", "sending s2s stanza: %s", tostring(stanza));

 		send_s2s(origin.host, host, stanza); -- TODO handle remote routing errors

 		stanza.attr.xmlns = xmlns; -- reset

 	elseif origin.type == "component" or origin.type == "local" then

 		-- Route via s2s for components and modules

 		log("debug", "Routing outgoing stanza for %s to %s", from_host, host);

 		send_s2s(from_host, host, stanza);

 	else

 		log("warn", "received stanza from unhandled connection type: %s", origin.type);

 	end

 	stanza.attr.to = to; -- reset

 end

 function select_best_resources(user)

 	local priority = 0;

 	local recipients = {};

 	for _, session in pairs(user.sessions) do -- find resource with greatest priority

 		if session.presence then

 			local p = session.priority;

 			if p > priority then

 				priority = p;

 				recipients = {session};

 			elseif p == priority then

 				t_insert(recipients, session);

 			end

 		end

 	end

 	return recipients;

 end