Mercurial > lxmppd-hg-xmllex / changeset

--- a/core/stanza_router.lua	Thu Oct 23 18:33:10 2008 +0100
+++ b/core/stanza_router.lua	Thu Oct 23 18:39:26 2008 +0100
@@ -1,3 +1,223 @@
+<<<<<<< local
+
+-- 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")
+
+local st = require "util.stanza";
+local send = require "core.sessionmanager".send_to_session;
+-- local send_s2s = require "core.s2smanager".send_to_host;
+local user_exists = require "core.usermanager".user_exists;
+
+local jid_split = require "util.jid".split;
+local print, debug = print, debug;
+
+function core_process_stanza(origin, stanza)
+	log("debug", "Received: "..tostring(stanza))
+	-- TODO verify validity of stanza (as well as JID validity)
+	if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then
+		if stanza.attr.type == "set" or stanza.attr.type == "get" then
+			error("Invalid IQ");
+		elseif #stanza.tags > 1 or not(stanza.attr.type == "error" or stanza.attr.type == "result") then
+			error("Invalid IQ");
+		end
+	end
+
+	if origin.type == "c2s" and not origin.full_jid
+		and not(stanza.name == "iq" and stanza.tags[1].name == "bind"
+				and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
+		error("Client MUST bind resource after auth");
+	end
+
+	local to = stanza.attr.to;
+	stanza.attr.from = origin.full_jid; -- quick fix to prevent impersonation (FIXME this would be incorrect when the origin is not c2s)
+	-- TODO also, stazas should be returned to their original state before the function ends
+	
+	-- TODO presence subscriptions
+	if not to then
+			core_handle_stanza(origin, stanza);
+	elseif hosts[to] and hosts[to].type == "local" then
+		core_handle_stanza(origin, stanza);
+	elseif stanza.name == "iq" and not select(3, jid_split(to)) then
+		core_handle_stanza(origin, stanza);
+	elseif origin.type == "c2s" then
+		core_route_stanza(origin, stanza);
+	end
+end
+
+-- This function handles stanzas which are not routed any further,
+-- that is, they are handled by this server
+function core_handle_stanza(origin, stanza)
+	-- Handlers
+	if origin.type == "c2s" or origin.type == "c2s_unauthed" then
+		local session = origin;
+		
+		if stanza.name == "presence" and origin.roster then
+			if stanza.attr.type == nil or stanza.attr.type == "available" or stanza.attr.type == "unavailable" then
+				for jid in pairs(origin.roster) do -- broadcast to all interested contacts
+					local subscription = origin.roster[jid].subscription;
+					if subscription == "both" or subscription == "from" then
+						stanza.attr.to = jid;
+						core_route_stanza(origin, stanza);
+					end
+				end
+				local node, host = jid_split(stanza.attr.from);
+				for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources and from resources
+					if res ~= origin then
+						if res.full_jid then -- to resource. FIXME is this check correct? Maybe it should be res.presence
+							stanza.attr.to = res.full_jid;
+							core_route_stanza(origin, stanza);
+						end
+						if res.presence then -- from all resources for which we have presence
+							res.presence.attr.to = origin.full_jid;
+							core_route_stanza(res, res.presence);
+							res.presence.attr.to = nil;
+						end
+					end
+				end
+				if not origin.presence then -- presence probes on initial presence
+					local probe = st.presence({from = origin.full_jid, type = "probe"});
+					for jid in pairs(origin.roster) do
+						local subscription = origin.roster[jid].subscription;
+						if subscription == "both" or subscription == "to" then
+							probe.attr.to = jid;
+							core_route_stanza(origin, probe);
+						end
+					end
+					-- TODO resend subscription requests
+				end
+				origin.presence = stanza;
+				stanza.attr.to = nil; -- reset it
+			else
+				-- TODO error, bad type
+			end
+		else
+			log("debug", "Routing stanza to local");
+			handle_stanza(session, stanza);
+		end
+	end
+end
+
+function is_authorized_to_see_presence(origin, username, host)
+	local roster = datamanager.load(username, host, "roster") or {};
+	local item = roster[origin.username.."@"..origin.host];
+	return item and (item.subscription == "both" or item.subscription == "from");
+end
+
+function core_route_stanza(origin, stanza)
+	-- Hooks
+	--- ...later
+	
+	-- Deliver
+	local to = stanza.attr.to;
+	local node, host, resource = jid_split(to);
+
+	if stanza.name == "presence" and (stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable") 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 not res then
+				-- 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" then
+						if stanza.attr.type == "probe" then
+							if is_authorized_to_see_presence(origin, node, host) then
+								for k in pairs(user.sessions) do -- return presence for all resources
+									if user.sessions[k].presence then
+										local pres = user.sessions[k].presence;
+										pres.attr.to = origin.full_jid;
+										pres.attr.from = user.sessions[k].full_jid;
+										send(origin, pres);
+										pres.attr.to = nil;
+										pres.attr.from = nil;
+									end
+								end
+							else
+								send(origin, st.presence({from=user.."@"..host, to=origin.username.."@"..origin.host, type="unsubscribed"}));
+							end
+						elseif stanza.attr.type == "subscribe" then
+							-- TODO
+						elseif stanza.attr.type == "unsubscribe" then
+							-- TODO
+						elseif stanza.attr.type == "subscribed" then
+							-- TODO
+						elseif stanza.attr.type == "unsubscribed" then
+							-- TODO
+						end -- discard any other type
+					else -- sender is available or unavailable
+						for k in pairs(user.sessions) do -- presence broadcast to all user resources
+							if user.sessions[k].full_jid then
+								stanza.attr.to = user.sessions[k].full_jid;
+								send(user.sessions[k], stanza);
+							end
+						end
+					end
+				elseif stanza.name == "message" then -- select a resource to recieve message
+					for k in pairs(user.sessions) do
+						if user.sessions[k].full_jid then
+							res = user.sessions[k];
+							break;
+						end
+					end
+					-- TODO find resource with greatest priority
+					send(res, stanza);
+				else
+					-- TODO send IQ error
+				end
+			else
+				-- User + resource is online...
+				stanza.attr.to = res.full_jid;
+				send(res, stanza); -- Yay \o/
+			end
+		else
+			-- user not online
+			if user_exists(node, host) then
+				if stanza.name == "presence" then
+					if stanza.attr.type == "probe" and is_authorized_to_see_presence(origin, node, host) then -- FIXME what to do for not c2s?
+						-- TODO send last recieved unavailable presence
+					else
+						-- TODO send unavailable presence
+					end
+				elseif stanza.name == "message" then
+					-- TODO send message error, or store offline messages
+				elseif stanza.name == "iq" then
+					-- TODO send IQ error
+				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
+					if stanza.attr.type == "probe" then
+						send(origin, st.presence({from = user.."@"..host, to = origin.username.."@"..origin.host, type = "unsubscribed"}));
+					end
+					-- else ignore
+				else
+					send(origin, st.error_reply(stanza, "cancel", "service-unavailable"));
+				end
+			end
+		end
+	else
+		-- Remote host
+		if host_session then
+			-- Send to session
+		else
+			-- Need to establish the connection
+		end
+	end
+	stanza.attr.to = to; -- reset
+end
+
+function handle_stanza_toremote(stanza)
+	log("error", "Stanza bound for remote host, but s2s is not implemented");
+end
+=======
 
 -- 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
@@ -93,6 +313,7 @@
 	end
 end
 
+-- TODO: Does this function belong here?
 function is_authorized_to_see_presence(origin, username, host)
 	local roster = datamanager.load(username, host, "roster") or {};
 	local item = roster[origin.username.."@"..origin.host];
@@ -186,11 +407,7 @@
 		end
 	else
 		-- Remote host
-		if host_session then
-			-- Send to session
-		else
-			-- Need to establish the connection
-		end
+		send_s2s(origin.host, host, stanza);
 	end
 	stanza.attr.to = to; -- reset
 end
@@ -198,3 +415,4 @@
 function handle_stanza_toremote(stanza)
 	log("error", "Stanza bound for remote host, but s2s is not implemented");
 end
+>>>>>>> other