Diff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/stanza_router.lua	Tue Sep 30 19:52:00 2008 +0100
@@ -0,0 +1,292 @@
+
+-- The code in this file should be self-explanatory, though the logic is horrible
+-- for more info on that, see doc/stanza_routing.txt, which attempts to condense
+-- the rules from the RFCs (mainly 3921)
+
+require "core.servermanager"
+
+local log = require "util.logger".init("stanzarouter")
+
+require "util.jid"
+local jid_split = jid.split;
+
+function core_process_stanza(origin, stanza)
+	local to = stanza.attr.to;
+	
+	if not to or (hosts[to] and hosts[to].type == "local") then
+		core_handle_stanza(origin, stanza);
+	elseif origin.type == "c2s" then
+		core_route_stanza(origin, stanza);
+	end
+		
+end
+
+function core_handle_stanza(origin, stanza)
+	-- Handlers
+	if origin.type == "c2s" or origin.type == "c2s_unauthed" then
+		local session = origin;
+		stanza.attr.from = session.full_jid;
+		
+		log("debug", "Routing stanza");
+		-- Stanza has no to attribute
+		--local to_node, to_host, to_resource = jid_split(stanza.attr.to);
+		--if not to_host then error("Invalid destination JID: "..string.format("{ %q, %q, %q } == %q", to_node or "", to_host or "", to_resource or "", stanza.attr.to or "nil")); end
+		
+		-- Stanza is to this server, or a user on this server
+		log("debug", "Routing stanza to local");
+		print(type(origin), type(stanza));
+		handle_stanza(session, stanza);
+	end	
+end
+
+function core_route_stanza(origin, stanza)
+	-- Hooks
+	-- Deliver
+end
+
+function handle_stanza_nodest(stanza)
+	if stanza.name == "iq" then
+		handle_stanza_iq_no_to(session, stanza);
+	elseif stanza.name == "presence" then
+		-- Broadcast to this user's contacts
+		handle_stanza_presence_broadcast(session, stanza);
+		-- also, if it is initial presence, send out presence probes
+		if not session.last_presence then
+			handle_stanza_presence_probe_broadcast(session, stanza);
+		end
+		session.last_presence = stanza;
+	elseif stanza.name == "message" then
+		-- Treat as if message was sent to bare JID of the sender
+		handle_stanza_to_local_user(stanza);
+	end
+end
+
+function handle_stanza_tolocal(stanza)
+	local node, host, resource = jid.split(stanza.attr.to);
+	if host and hosts[host] and hosts[host].type == "local" then
+			-- Is a local host, handle internally
+			if node then
+				-- Is a local user, send to their session
+				log("debug", "Routing stanza to %s@%s", node, host);
+				if not session.username then return; end --FIXME: Correct response when trying to use unauthed stream is what?
+				handle_stanza_to_local_user(stanza);
+			else
+				-- Is sent to this server, let's handle it...
+				log("debug", "Routing stanza to %s", host);
+				handle_stanza_to_server(stanza, session);
+			end
+	end
+end
+
+function handle_stanza_toremote(stanza)
+	log("error", "Stanza bound for remote host, but s2s is not implemented");
+end
+
+
+--[[
+local function route_c2s_stanza(session, stanza)
+	stanza.attr.from = session.full_jid;
+	if not stanza.attr.to and session.username then
+		-- Has no 'to' attribute, handle internally
+		if stanza.name == "iq" then
+			handle_stanza_iq_no_to(session, stanza);
+		elseif stanza.name == "presence" then
+			-- Broadcast to this user's contacts
+			handle_stanza_presence_broadcast(session, stanza);
+			-- also, if it is initial presence, send out presence probes
+			if not session.last_presence then
+				handle_stanza_presence_probe_broadcast(session, stanza);
+			end
+			session.last_presence = stanza;
+		elseif stanza.name == "message" then
+			-- Treat as if message was sent to bare JID of the sender
+			handle_stanza_to_local_user(stanza);
+		end
+	end
+	local node, host, resource = jid.split(stanza.attr.to);
+	if host and hosts[host] and hosts[host].type == "local" then
+			-- Is a local host, handle internally
+			if node then
+				-- Is a local user, send to their session
+				if not session.username then return; end --FIXME: Correct response when trying to use unauthed stream is what?
+				handle_stanza_to_local_user(stanza);
+			else
+				-- Is sent to this server, let's handle it...
+				handle_stanza_to_server(stanza, session);
+			end
+	else
+		-- Is not for us or a local user, route accordingly
+		route_s2s_stanza(stanza);
+	end
+end
+
+function handle_stanza_no_to(session, stanza)
+	if not stanza.attr.id then log("warn", "<iq> without id attribute is invalid"); end
+	local xmlns = (stanza.tags[1].attr and stanza.tags[1].attr.xmlns);
+	if stanza.attr.type == "get" or stanza.attr.type == "set" then
+		if iq_handlers[xmlns] then
+			if iq_handlers[xmlns](stanza) then return; end; -- If handler returns true, it handled it
+		end
+		-- Oh, handler didn't handle it. Need to send service-unavailable now.
+		log("warn", "Unhandled namespace: "..xmlns);
+		session:send(format("<iq type='error' id='%s'><error type='cancel'><service-unavailable/></error></iq>", stanza.attr.id));
+		return; -- All done!
+	end
+end
+
+function handle_stanza_to_local_user(stanza)
+	if stanza.name == "message" then
+		handle_stanza_message_to_local_user(stanza);
+	elseif stanza.name == "presence" then
+		handle_stanza_presence_to_local_user(stanza);
+	elseif stanza.name == "iq" then
+		handle_stanza_iq_to_local_user(stanza);
+	end
+end
+
+function handle_stanza_message_to_local_user(stanza)
+	local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource;
+	local destuser = hosts[host].sessions[node];
+	if destuser then
+		if resource and destuser[resource] then
+			destuser[resource]:send(stanza);
+		else
+			-- Bare JID, or resource offline
+			local best_session;
+			for resource, session in pairs(destuser.sessions) do
+				if not best_session then best_session = session;
+				elseif session.priority >= best_session.priority and session.priority >= 0 then
+					best_session = session;
+				end
+			end
+			if not best_session then
+				offlinemessage.new(node, host, stanza);
+			else
+				print("resource '"..resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'");
+				destuser[best_session]:send(stanza);
+			end
+		end
+	else
+		-- User is offline
+		offlinemessage.new(node, host, stanza);
+	end
+end
+
+function handle_stanza_presence_to_local_user(stanza)
+	local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource;
+	local destuser = hosts[host].sessions[node];
+	if destuser then
+		if resource then
+			if destuser[resource] then
+				destuser[resource]:send(stanza);
+			else
+				return;
+			end
+		else
+			-- Broadcast to all user's resources
+			for resource, session in pairs(destuser.sessions) do
+				session:send(stanza);
+			end
+		end
+	end
+end
+
+function handle_stanza_iq_to_local_user(stanza)
+
+end
+
+function foo()
+		local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource;
+		local destuser = hosts[host].sessions[node];
+		if destuser and destuser.sessions then
+			-- User online
+			if resource and destuser.sessions[resource] then
+				stanza.to:send(stanza);
+			else
+				--User is online, but specified resource isn't (or no resource specified)
+				local best_session;
+				for resource, session in pairs(destuser.sessions) do
+					if not best_session then best_session = session;
+					elseif session.priority >= best_session.priority and session.priority >= 0 then
+						best_session = session;
+					end
+				end
+				if not best_session then
+					offlinemessage.new(node, host, stanza);
+				else
+					print("resource '"..resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'");
+					resource = best_session.resource;
+				end
+			end
+			if destuser.sessions[resource] == session then
+				log("warn", "core", "Attempt to send stanza to self, dropping...");
+			else
+				print("...sending...", tostring(stanza));
+				--destuser.sessions[resource].conn.write(tostring(data));
+				print("   to conn ", destuser.sessions[resource].conn);
+				destuser.sessions[resource].conn.write(tostring(stanza));
+				print("...sent")
+			end
+		elseif stanza.name == "message" then
+			print("   ...will be stored offline");
+			offlinemessage.new(node, host, stanza);
+		elseif stanza.name == "iq" then
+			print("   ...is an iq");
+			stanza.from:send(st.reply(stanza)
+				:tag("error", { type = "cancel" })
+					:tag("service-unavailable", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas" }));
+		end
+end
+
+-- Broadcast a presence stanza to all of a user's contacts
+function handle_stanza_presence_broadcast(session, stanza)
+	if session.roster then
+		local initial_presence = not session.last_presence;
+		session.last_presence = stanza;
+		
+		-- Broadcast presence and probes
+		local broadcast = st.presence({ from = session.full_jid, type = stanza.attr.type });
+
+		for child in stanza:childtags() do
+			broadcast:add_child(child);
+		end
+		for contact_jid in pairs(session.roster) do
+			broadcast.attr.to = contact_jid;
+			send_to(contact_jid, broadcast);
+			if initial_presence then
+				local node, host = jid.split(contact_jid);
+				if hosts[host] and hosts[host].type == "local" then
+					local contact = hosts[host].sessions[node]
+					if contact then
+						local pres = st.presence { to = session.full_jid };
+						for resource, contact_session in pairs(contact.sessions) do
+							if contact_session.last_presence then
+								pres.tags = contact_session.last_presence.tags;
+								pres.attr.from = contact_session.full_jid;
+								send(pres);
+							end
+						end
+					end
+					--FIXME: Do we send unavailable if they are offline?
+				else
+					probe.attr.to = contact;
+					send_to(contact, probe);
+				end
+			end
+		end
+		
+		-- Probe for our contacts' presence
+	end
+end
+
+-- Broadcast presence probes to all of a user's contacts
+function handle_stanza_presence_probe_broadcast(session, stanza)
+end
+
+-- 
+function handle_stanza_to_server(stanza)
+end
+
+function handle_stanza_iq_no_to(session, stanza)
+end
+]]
\ No newline at end of file