-- 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;

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

		-- old stanza routing code removed

	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