First commit, where do you want to go tomorrow?

8 files changed, 612 insertions, 0 deletions

diff --git a/core/offlinemessage.lua b/core/offlinemessage.lua
new file mode 100644
index 00000000..dda9b7d8
--- /dev/null
+++ b/core/offlinemessage.lua
@@ -0,0 +1,13 @@
+
+require "util.datamanager"
+
+local datamanager = datamanager;
+local t_insert = table.insert;
+
+module "offlinemessage"
+
+function new(user, host, stanza)
+	local offlinedata = datamanager.load(user, host, "offlinemsg") or {};
+	t_insert(offlinedata, stanza);
+	return datamanager.store(user, host, "offlinemsg", offlinedata);
+end
diff --git a/core/rostermanager.lua b/core/rostermanager.lua
new file mode 100644
index 00000000..7a1e7d4e
--- /dev/null
+++ b/core/rostermanager.lua
@@ -0,0 +1,19 @@
+
+local mainlog = log;
+local function log(type, message)
+	mainlog(type, "rostermanager", message);
+end
+
+local setmetatable = setmetatable;
+local format = string.format;
+local loadfile, setfenv, pcall = loadfile, setfenv, pcall;
+
+require "util.datamanager"
+
+local datamanager = datamanager;
+
+module "rostermanager"
+
+function getroster(username, host)
+	return datamanager.load(username, host, "roster") or {};
+end
diff --git a/core/stanza_dispatch.lua b/core/stanza_dispatch.lua
new file mode 100644
index 00000000..b7428ecd
--- /dev/null
+++ b/core/stanza_dispatch.lua
@@ -0,0 +1,103 @@
+
+require "util.stanza"
+
+local st = stanza;
+
+local t_concat = table.concat;
+local format = string.format;
+
+function init_stanza_dispatcher(session)
+	local iq_handlers = {};
+
+	local session_log = session.log;
+	local log = function (type, msg) session_log(type, "stanza_dispatcher", msg); end
+	local send = session.send;
+
+
+
+	iq_handlers["jabber:iq:auth"] = 
+		function (stanza)
+			local username = stanza[1]:child_with_name("username");
+			local password = stanza[1]:child_with_name("password");
+			local resource = stanza[1]:child_with_name("resource");
+			if not (username and password and resource) then
+				local reply = st.reply(stanza);
+				send(reply:query("jabber:iq:auth")
+					:tag("username"):up()
+					:tag("password"):up()
+					:tag("resource"):up());
+				return true;			
+			else
+				username, password, resource = t_concat(username), t_concat(password), t_concat(resource);
+				print(username, password, resource)
+				local reply = st.reply(stanza);
+				require "core.usermanager"
+				if usermanager.validate_credentials(session.host, username, password) then
+					-- Authentication successful!
+					session.username = username;
+					session.resource = resource;
+					if not hosts[session.host].sessions[username] then
+						hosts[session.host].sessions[username] = { sessions = {} };
+					end
+					hosts[session.host].sessions[username].sessions[resource] = session;
+					send(st.reply(stanza));
+					return true;
+				else
+					local reply = st.reply(stanza);
+					reply.attr.type = "error";
+					reply:tag("error", { code = "401", type = "auth" })
+						:tag("not-authorized", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas" });
+					send(reply);
+					return true;
+				end
+			end
+			
+		end
+		
+	iq_handlers["jabber:iq:roster"] =
+		function (stanza)
+			if stanza.attr.type == "get" then
+				session.roster = session.roster or rostermanager.getroster(session.username, session.host);
+				if session.roster == false then
+					send(st.reply(stanza)
+						:tag("error", { type = "wait" })
+						:tag("internal-server-error", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}));
+					return true;
+				else session.roster = session.roster or {};
+				end
+				local roster = st.reply(stanza)
+							:query("jabber:iq:roster");
+				for jid in pairs(session.roster) do
+					roster:tag("item", { jid = jid, subscription = "none" }):up();
+				end
+				send(roster);
+				return true;
+			end
+		end
+
+
+	return	function (stanza)
+			log("info", "--> "..tostring(stanza));
+			if stanza.name == "iq" then
+				if not stanza[1] then log("warn", "<iq> without child is invalid"); return; end
+				if not stanza.attr.id then log("warn", "<iq> without id attribute is invalid"); end
+				local xmlns = stanza[1].attr.xmlns;
+				if not xmlns then log("warn", "Child of <iq> has no xmlns - invalid"); return; end
+				if (((not stanza.attr.to) or stanza.attr.to == session.host or stanza.attr.to:match("@[^/]+$")) and (stanza.attr.type == "get" or stanza.attr.type == "set")) then -- Stanza sent to us
+					if iq_handlers[xmlns] then
+						if iq_handlers[xmlns](stanza) then return; end;
+					end
+					log("warn", "Unhandled namespace: "..xmlns);
+					send(format("<iq type='error' id='%s'><error type='cancel'><service-unavailable/></error></iq>", stanza.attr.id));
+				end
+			
+			end
+							-- Need to route stanza
+			if stanza.attr.to and ((not hosts[stanza.attr.to]) or hosts[stanza.attr.to].type ~= "local") then
+				stanza.attr.from = session.username.."@"..session.host;
+				session.send_to(stanza.attr.to, stanza);
+			end
+		end
+
+end
+
diff --git a/core/usermanager.lua b/core/usermanager.lua
new file mode 100644
index 00000000..c98a1918
--- /dev/null
+++ b/core/usermanager.lua
@@ -0,0 +1,11 @@
+
+require "util.datamanager"
+local datamanager = datamanager;
+
+module "usermanager"
+
+function validate_credentials(host, username, password)
+	local credentials = datamanager.load(username, host, "accounts") or {};
+	if password == credentials.password then return true; end
+	return false;
+end
diff --git a/main.lua b/main.lua
new file mode 100644
index 00000000..cb6e03fd
--- /dev/null
+++ b/main.lua
@@ -0,0 +1,275 @@
+require "luarocks.require"
+
+require "copas"
+require "socket"
+require "ssl"
+require "lxp"
+
+function log(type, area, message)
+	print(type, area, message);
+end
+
+require "core.stanza_dispatch"
+require "core.rostermanager"
+require "core.offlinemessage"
+require "util.stanza"
+require "util.jid"
+
+-- Locals for faster access --
+local t_insert = table.insert;
+local t_concat = table.concat;
+local t_concatall = function (t, sep) local tt = {}; for _, s in ipairs(t) do t_insert(tt, tostring(s)); end return t_concat(tt, sep); end
+local m_random = math.random;
+local format = string.format;
+local st = stanza;
+------------------------------
+
+users = {};
+hosts = 	{ 
+			["localhost"] = 	{
+							type = "local";
+							connected = true;
+							sessions = {};
+						};
+			["getjabber.ath.cx"] = 	{
+							type = "local";
+							connected = true;
+							sessions = {};
+						};
+		}
+
+local hosts, users = hosts, users;
+
+local ssl_ctx, msg = ssl.newcontext { mode = "server", protocol = "sslv23", key = "/home/matthew/ssl_cert/server.key",
+    certificate = "/home/matthew/ssl_cert/server.crt", capath = "/etc/ssl/certs", verify = "none", }
+        
+if not ssl_ctx then error("Failed to initialise SSL/TLS support: "..tostring(msg)); end
+
+
+function connect_host(host)
+	hosts[host] = { type = "remote", sendbuffer = {} };
+end
+
+function handler(conn)
+	local copas_receive, copas_send = copas.receive, copas.send;
+	local reqdata, sktmsg;
+	local session = { sendbuffer = { external = {} }, conn = conn, notopen = true, priority = 0 }
+
+
+	-- Logging functions --
+
+	local mainlog, log = log;
+	do
+		local conn_name = tostring(conn):match("%w+$");
+		log = function (type, area, message) mainlog(type, conn_name, message); end
+	end
+	local print = function (...) log("info", "core", t_concatall({...}, "\t")); end
+	session.log = log;
+
+	--	--	--
+
+	-- Send buffers --
+
+	local sendbuffer = session.sendbuffer;
+	local send = function (data) return t_insert(sendbuffer, tostring(data)); end;
+	local send_to = 	function (to, stanza)
+					local node, host, resource = jid.split(to);
+					print("Routing stanza to "..to..":", node, host, resource);
+					if not hosts[host] then
+						print("   ...but host offline, establishing connection");
+						connect_host(host);
+						t_insert(hosts[host].sendbuffer, stanza); -- This will be sent when s2s connection succeeds					
+					elseif hosts[host].connected then
+						print("   ...putting in our external send buffer");
+						t_insert(sendbuffer.external, { node = node, host = host, resource = resource, data = stanza});
+						print("   ...there are now "..tostring(#sendbuffer.external).." stanzas in the external send buffer");
+					end
+				end
+	session.send, session.send_to = send, send_to;
+
+	--	--	--
+	print("Client connected");
+	conn = ssl.wrap(copas.wrap(conn), ssl_ctx);
+	
+	do
+		local succ, msg
+		conn:settimeout(15)
+		while not succ do
+			succ, msg = conn:dohandshake()
+			if not succ then
+				print("SSL: "..tostring(msg));
+				if msg == 'wantread' then
+					socket.select({conn}, nil)
+				elseif msg == 'wantwrite' then
+					socket.select(nil, {conn})
+				else
+					-- other error
+				end
+			end
+		end
+	end
+	print("SSL handshake complete");
+	-- XML parser initialisation --
+
+	local parser;
+	local stanza;
+	
+	local stanza_dispatch = init_stanza_dispatcher(session);
+
+	local xml_handlers = {};
+	
+	do
+		local ns_stack = { "" };
+		local curr_ns = "";
+		local curr_tag;
+		function xml_handlers:StartElement(name, attr)
+			curr_ns,name = name:match("^(.+):(%w+)$");
+			print("Tag received:", name, tostring(curr_ns));
+			if not stanza then
+				if session.notopen then
+					if name == "stream" then
+						session.host = attr.to or error("Client failed to specify destination hostname");
+			                        session.version = attr.version or 0;
+			                        session.streamid = m_random(1000000, 99999999);
+			                        print(session, session.host, "Client opened stream");
+			                        send("<?xml version='1.0'?>");
+			                        send(format("<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s' >", session.streamid, session.host));
+			                        --send("<stream:features>");
+			                        --send("<mechanism>PLAIN</mechanism>");
+        			                --send [[<register xmlns="http://jabber.org/features/iq-register"/> ]]
+        			                --send("</stream:features>");
+						log("info", "core", "Stream opened successfully");
+						session.notopen = nil;
+						return;
+					end
+					error("Client failed to open stream successfully");
+				end
+				if name ~= "iq" and name ~= "presence" and name ~= "message" then
+					error("Client sent invalid top-level stanza");
+				end
+				stanza = st.stanza(name, { to = attr.to, type = attr.type, id = attr.id, xmlns = curr_ns });
+				curr_tag = stanza;
+			else
+				attr.xmlns = curr_ns;
+				stanza:tag(name, attr);
+			end
+		end
+		function xml_handlers:CharacterData(data)
+			if data:match("%S") then
+				stanza:text(data);
+			end
+		end
+		function xml_handlers:EndElement(name)
+			curr_ns,name = name:match("^(.+):(%w+)$");
+			--print("<"..name.."/>", tostring(stanza), tostring(#stanza.last_add < 1), tostring(stanza.last_add[#stanza.last_add].name));
+			if (not stanza) or #stanza.last_add < 0 or (#stanza.last_add > 0 and name ~= stanza.last_add[#stanza.last_add].name) then error("XML parse error in client stream"); end
+			-- Complete stanza
+			print(name, tostring(#stanza.last_add));
+			if #stanza.last_add == 0 then
+				stanza_dispatch(stanza);
+				stanza = nil;
+			else
+				stanza:up();
+			end
+		end
+--[[		function xml_handlers:StartNamespaceDecl(namespace)
+			table.insert(ns_stack, namespace);
+			curr_ns = namespace;
+			log("debug", "parser", "Entering namespace "..tostring(curr_ns));
+		end
+		function xml_handlers:EndNamespaceDecl(namespace)
+			table.remove(ns_stack);
+			log("debug", "parser", "Leaving namespace "..tostring(curr_ns));
+			curr_ns = ns_stack[#ns_stack];
+			log("debug", "parser", "Entering namespace "..tostring(curr_ns));
+		end
+]]
+	end
+	parser = lxp.new(xml_handlers, ":");
+
+	--	--	--
+
+	-- Main loop --
+	print "Receiving..."
+	reqdata = copas_receive(conn, 1);
+	print "Received"
+	while reqdata do
+		parser:parse(reqdata);
+		if #sendbuffer.external > 0 then
+			-- Stanzas queued to go to other places, from us
+			-- ie. other local users, or remote hosts that weren't connected before
+			print(#sendbuffer.external.." stanzas queued for other recipients, sending now...");
+			for n, packet in pairs(sendbuffer.external) do
+				if not hosts[packet.host] then
+					connect_host(packet.host);
+					t_insert(hosts[packet.host].sendbuffer, packet.data);
+				elseif hosts[packet.host].type == "local" then
+					print("   ...is to a local user")
+					local destuser = hosts[packet.host].sessions[packet.node];
+					if destuser and destuser.sessions then
+						if not destuser.sessions[packet.resource] then
+							local best_resource;
+							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(packet.node, packet.host, packet.data);
+							else
+								print("resource '"..packet.resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'");
+								packet.resource = best_session.resource;
+							end
+						end
+						if destuser.sessions[packet.resource] == session then
+							log("warn", "core", "Attempt to send stanza to self, dropping...");
+						else
+							print("...sending...");
+							copas_send(destuser.sessions[packet.resource].conn, tostring(packet.data));
+							print("...sent")
+						end
+					elseif packet.data.name == "message" then
+						print("   ...will be stored offline");
+						offlinemessage.new(packet.node, packet.host, packet.data);
+					elseif packet.data.name == "iq" then
+						print("   ...is an iq");
+						send(st.reply(packet.data)
+							:tag("error", { type = "cancel" })
+								:tag("service-unavailable", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas" }));
+					end
+					print("   ...removing from send buffer");
+					sendbuffer.external[n] = nil;
+				end
+			end
+		end
+		
+		if #sendbuffer > 0 then 
+			for n, data in ipairs(sendbuffer) do
+				print "Sending..."
+				copas_send(conn, data);
+				print "Sent"
+				sendbuffer[n] = nil;
+			end
+		end
+		print "Receiving..."
+		repeat
+			reqdata, sktmsg = copas_receive(conn, 1);
+			if sktmsg == 'wantread' then
+				print("Received... wantread");
+				--socket.select({conn}, nil)
+				--print("Socket ready now...");
+			elseif sktmsg then
+				print("Received socket message:", sktmsg);
+			end
+		until reqdata or sktmsg == "closed";
+		print("Received", tostring(reqdata));
+	end
+	log("info", "core", "Client disconnected, connection closed");
+end
+
+server = socket.bind("*", 5223)
+assert(server, "Failed to bind to socket")
+copas.addserver(server, handler)
+
+copas.loop();
diff --git a/util/datamanager.lua b/util/datamanager.lua
new file mode 100644
index 00000000..be63673e
--- /dev/null
+++ b/util/datamanager.lua
@@ -0,0 +1,79 @@
+local format = string.format;
+local setmetatable, type = setmetatable, type;
+local pairs = pairs;
+local char = string.char;
+local loadfile, setfenv, pcall = loadfile, setfenv, pcall;
+local log = log;
+local io_open = io.open;
+
+module "datamanager"
+
+
+---- utils -----
+local encode, decode;
+
+local log = function (type, msg) return log(type, "datamanager", msg); end
+
+do 
+	local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
+
+	decode = function (s)
+		return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
+	end
+
+	encode = function (s)
+		return s and (s:gsub("%W", function (c) return format("%%%x", c:byte()); end));
+	end
+end
+
+local function basicSerialize (o)
+  if type(o) == "number" or type(o) == "boolean" then
+    return tostring(o)
+  else -- assume it is a string
+    return string.format("%q", tostring(o))
+  end
+end
+
+
+local function simplesave (f, o)
+      if type(o) == "number" then
+        f:write(o)
+      elseif type(o) == "string" then
+        f:write(format("%q", o))
+      elseif type(o) == "table" then
+        f:write("{\n")
+        for k,v in pairs(o) do
+          f:write(" [", format("%q", k), "] = ")
+          simplesave(f, v)
+          f:write(",\n")
+        end
+        f:write("}\n")
+      else
+        error("cannot serialize a " .. type(o))
+      end
+    end
+  
+------- API -------------
+
+function getpath(username, host, datastore)
+	return format("data/%s/%s/%s.dat", encode(host), datastore, encode(username));
+end
+
+function load(username, host, datastore)
+	local data, ret = loadfile(getpath(username, host, datastore));
+	if not data then log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..username.."@"..host); return nil; end
+	setfenv(data, {});
+	local success, ret = pcall(data);
+	if not success then log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..username.."@"..host); return nil; end
+	return ret;
+end
+
+function store(username, host, datastore, data)
+	local f, msg = io_open(getpath(username, host, datastore), "w+");
+	if not f then log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..username.."@"..host); return nil; end
+	f:write("return ");
+	simplesave(f, data);
+	f:close();
+	return true;
+end
+
diff --git a/util/jid.lua b/util/jid.lua
new file mode 100644
index 00000000..9d01e2af
--- /dev/null
+++ b/util/jid.lua
@@ -0,0 +1,8 @@
+
+local match = string.match;
+
+module "jid"
+
+function split(jid)
+	return match(jid, "^([^@]+)@([^/]+)/?(.*)$");
+end
diff --git a/util/stanza.lua b/util/stanza.lua
new file mode 100644
index 00000000..88d0609f
--- /dev/null
+++ b/util/stanza.lua
@@ -0,0 +1,104 @@
+local t_insert  =   table.insert;
+local t_remove  =   table.remove;
+local format    =  string.format;
+local tostring  =       tostring;
+local setmetatable= setmetatable;
+local pairs     =          pairs;
+local ipairs    =         ipairs;
+
+module "stanza"
+
+stanza_mt = {};
+stanza_mt.__index = stanza_mt;
+
+function stanza(name, attr)
+	local stanza = { name = name, attr = attr or {}, last_add = {}};
+	return setmetatable(stanza, stanza_mt);
+end
+
+function stanza_mt:iq(attrs)
+	return self + stanza("iq", attrs)
+end
+function stanza_mt:message(attrs)
+	return self + stanza("message", attrs)
+end
+function stanza_mt:presence(attrs)
+	return self + stanza("presence", attrs)
+end
+function stanza_mt:query(xmlns)
+	return self:tag("query", { xmlns = xmlns });
+end
+function stanza_mt:tag(name, attrs)
+	local s = stanza(name, attrs);
+	(self.last_add[#self.last_add] or self):add_child(s);
+	t_insert(self.last_add, s);
+	return self;
+end
+
+function stanza_mt:text(text)
+	(self.last_add[#self.last_add] or self):add_child(text);
+	return self; 
+end
+
+function stanza_mt:up()
+	t_remove(self.last_add);
+	return self;
+end
+
+function stanza_mt:add_child(child)
+	t_insert(self, child);
+end
+
+function stanza_mt:child_with_name(name)
+	for _, child in ipairs(self) do	
+		if child.name == name then return child; end
+	end
+end
+
+function stanza_mt.__tostring(t)
+	local children_text = "";
+	for n, child in ipairs(t) do
+		children_text = children_text .. tostring(child);
+	end
+
+	local attr_string = "";
+	if t.attr then
+		for k, v in pairs(t.attr) do attr_string = attr_string .. format(" %s='%s'", k, tostring(v)); end
+	end
+
+	return format("<%s%s>%s</%s>", t.name, attr_string, children_text, t.name);
+end
+
+function stanza_mt.__add(s1, s2)
+	return s:add_child(s2);
+end
+
+
+do
+        local id = 0;
+        function new_id()
+                id = id + 1;
+                return "lx"..id;
+        end
+end
+
+function message(attr, body)
+	if not body then
+		return stanza("message", attr);
+	else
+		return stanza("message", attr):tag("body"):text(body);
+	end
+end
+function iq(attr)
+	if attr and not attr.id then attr.id = new_id(); end
+	return stanza("iq", attr or { id = new_id() });
+end
+
+function reply(orig)
+	return stanza(orig.name, orig.attr and { to = orig.attr.from, from = orig.attr.to, id = orig.attr.id, type = ((orig.name == "iq" and "result") or nil) });
+end
+
+function presence(attr)
+	return stanza("presence", attr);
+end
+