# HG changeset patch
# User Florian Zeitz <florob@babelmonkeys.de>
# Date 1358008432 -3600
# Node ID 1f4d77104da53cf36f24cf1e79034d8e713e7465
# Parent  d066987e00b7cba7c36b2f6389b471af11b7974e
mod_websocket: Simplify by getting the c2s_listener from mod_c2s

diff -r d066987e00b7 -r 1f4d77104da5 mod_websocket/mod_websocket.lua
--- a/mod_websocket/mod_websocket.lua	Sat Jan 12 03:49:50 2013 +0100
+++ b/mod_websocket/mod_websocket.lua	Sat Jan 12 17:33:52 2013 +0100
@@ -1,6 +1,4 @@
 -- Prosody IM
--- Copyright (C) 2008-2010 Matthew Wild
--- Copyright (C) 2008-2010 Waqas Hussain
 -- Copyright (C) 2012 Florian Zeitz
 --
 -- This project is MIT/X11 licensed. Please see the
@@ -9,28 +7,15 @@
 
 module:set_global();
 
-local add_task = require "util.timer".add_task;
-local new_xmpp_stream = require "util.xmppstream".new;
-local nameprep = require "util.encodings".stringprep.nameprep;
-local sessionmanager = require "core.sessionmanager";
-local st = require "util.stanza";
-local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
-local uuid_generate = require "util.uuid".generate;
+local add_filter = require "util.filters".add_filter;
 local sha1 = require "util.hashes".sha1;
 local base64 = require "util.encodings".base64.encode;
-local band = require "bit".band;
-local bxor = require "bit".bxor;
-
-local xpcall, tostring, type = xpcall, tostring, type;
-local traceback = debug.traceback;
+local softreq = require "util.dependencies".softreq;
+local portmanager = require "core.portmanager";
 
-local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
-
-local log = module._log;
-
-local c2s_timeout = module:get_option_number("c2s_timeout");
-local stream_close_timeout = module:get_option_number("c2s_close_timeout", 5);
-local opt_keepalives = module:get_option_boolean("tcp_keepalives", false);
+local bit = softreq"bit" or softreq"bit32" or module:log("error", "No bit module found. Either LuaJIT 2 or Lua 5.2 is required");
+local band = bit.band;
+local bxor = bit.bxor;
 
 local cross_domain = module:get_option("cross_domain_websocket");
 if cross_domain then
@@ -44,11 +29,9 @@
 	end
 end
 
-local sessions = module:shared("sessions");
-local core_process_stanza = prosody.core_process_stanza;
-
-local stream_callbacks = { default_ns = "jabber:client", handlestanza = core_process_stanza };
-local listener = {};
+module:depends("c2s")
+local sessions = module:shared("c2s/sessions");
+local c2s_listener = portmanager.get_service("c2s").listener;
 
 -- Websocket helpers
 local function parse_frame(frame)
@@ -131,189 +114,25 @@
 	return result;
 end
 
---- Stream events handlers
-local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
-local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
-
-function stream_callbacks.streamopened(session, attr)
-	local send = session.send;
-	session.host = nameprep(attr.to);
-	if not session.host then
-		session:close{ condition = "improper-addressing",
-			text = "A valid 'to' attribute is required on stream headers" };
-		return;
-	end
-	session.version = tonumber(attr.version) or 0;
-	session.streamid = uuid_generate();
-	(session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
+--- Filter stuff
+function handle_request(event, path)
+	local request, response = event.request, event.response;
+	local conn = response.conn;
 
-	if not hosts[session.host] then
-		-- We don't serve this host...
-		session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
-		return;
-	end
-
-	-- COMPAT: Some current client implementations need this to be self-closing
-	if session.self_closing_stream then
-		send("<?xml version='1.0'?>"..tostring(st.stanza("stream:stream", {
-			xmlns = 'jabber:client', ["xmlns:stream"] = 'http://etherx.jabber.org/streams';
-			id = session.streamid, from = session.host, version = '1.0', ["xml:lang"] = 'en' })));
-	else
-		send("<?xml version='1.0'?>"..st.stanza("stream:stream", {
-			xmlns = 'jabber:client', ["xmlns:stream"] = 'http://etherx.jabber.org/streams';
-			id = session.streamid, from = session.host, version = '1.0', ["xml:lang"] = 'en' }):top_tag());
-	end
-
-	(session.log or log)("debug", "Sent reply <stream:stream> to client");
-	session.notopen = nil;
-
-	-- If session.secure is *false* (not nil) then it means we /were/ encrypting
-	-- since we now have a new stream header, session is secured
-	if session.secure == false then
-		session.secure = true;
+	if not request.headers.sec_websocket_key then
+		response.headers.content_type = "text/html";
+		return [[<!DOCTYPE html><html><head><title>Websocket</title></head><body>
+			<p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p>
+			</body></html>]];
 	end
 
-	local features = st.stanza("stream:features");
-	hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
-	module:fire_event("stream-features", session, features);
-
-	send(features);
-end
-
-function stream_callbacks.streamclosed(session)
-	session.log("debug", "Received </stream:stream>");
-	session:close(false);
-end
-
-function stream_callbacks.error(session, error, data)
-	if error == "no-stream" then
-		session.log("debug", "Invalid opening stream header");
-		session:close("invalid-namespace");
-	elseif error == "parse-error" then
-		(session.log or log)("debug", "Client XML parse error: %s", tostring(data));
-		session:close("not-well-formed");
-	elseif error == "stream-error" then
-		local condition, text = "undefined-condition";
-		for child in data:children() do
-			if child.attr.xmlns == xmlns_xmpp_streams then
-				if child.name ~= "text" then
-					condition = child.name;
-				else
-					text = child:get_text();
-				end
-				if condition ~= "undefined-condition" and text then
-					break;
-				end
-			end
-		end
-		text = condition .. (text and (" ("..text..")") or "");
-		session.log("info", "Session closed by remote with error: %s", text);
-		session:close(nil, text);
-	end
-end
-
-local function handleerr(err) log("error", "Traceback[c2s]: %s: %s", tostring(err), traceback()); end
-function stream_callbacks.handlestanza(session, stanza)
-	stanza = session.filter("stanzas/in", stanza);
-	if stanza then
-		return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
-	end
-end
+	local wants_xmpp = false;
+	(request.headers.sec_websocket_protocol or ""):gsub("([^,]*),?", function (proto)
+		if proto == "xmpp" then wants_xmpp = true; end
+	end);
 
---- Session methods
-local function session_close(session, reason)
-	local log = session.log or log;
-	if session.conn then
-		if session.notopen then
-			-- COMPAT: Some current client implementations need this to be self-closing
-			if session.self_closing_stream then
-				session.send("<?xml version='1.0'?>"..tostring(st.stanza("stream:stream", default_stream_attr)));
-			else
-				session.send("<?xml version='1.0'?>"..st.stanza("stream:stream", default_stream_attr):top_tag());
-			end
-		end
-		if reason then -- nil == no err, initiated by us, false == initiated by client
-			if type(reason) == "string" then -- assume stream error
-				log("debug", "Disconnecting client, <stream:error> is: %s", reason);
-				session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
-			elseif type(reason) == "table" then
-				if reason.condition then
-					local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
-					if reason.text then
-						stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
-					end
-					if reason.extra then
-						stanza:add_child(reason.extra);
-					end
-					log("debug", "Disconnecting client, <stream:error> is: %s", tostring(stanza));
-					session.send(stanza);
-				elseif reason.name then -- a stanza
-					log("debug", "Disconnecting client, <stream:error> is: %s", tostring(reason));
-					session.send(reason);
-				end
-			end
-		end
-		session.send("</stream:stream>");
-		function session.send() return false; end
-
-		local reason = (reason and (reason.text or reason.condition)) or reason;
-		session.log("info", "c2s stream for %s closed: %s", session.full_jid or ("<"..session.ip..">"), reason or "session closed");
-
-		-- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
-		local conn = session.conn;
-		if reason == nil and not session.notopen and session.type == "c2s" then
-			-- Grace time to process data from authenticated cleanly-closed stream
-			add_task(stream_close_timeout, function ()
-				if not session.destroyed then
-					session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
-					sm_destroy_session(session, reason);
-					conn:close();
-				end
-			end);
-		else
-			sm_destroy_session(session, reason);
-			conn:close();
-		end
-	end
-end
-
-module:hook_global("user-deleted", function(event)
-	local username, host = event.username, event.host;
-	local user = hosts[host].sessions[username];
-	if user and user.sessions then
-		for jid, session in pairs(user.sessions) do
-			session:close{ condition = "not-authorized", text = "Account deleted" };
-		end
-	end
-end, 200);
-
---- Port listener
-function listener.onconnect(conn)
-	local session = sm_new_session(conn);
-	sessions[conn] = session;
-
-	session.log("info", "Client connected");
-
-	-- Client is using legacy SSL (otherwise mod_tls sets this flag)
-	if conn:ssl() then
-		session.secure = true;
-	end
-
-	if opt_keepalives then
-		conn:setoption("keepalive", opt_keepalives);
-	end
-
-	session.close = session_close;
-
-	session.conn.starttls = nil;
-
-	local stream = new_xmpp_stream(session, stream_callbacks);
-	session.stream = stream;
-	session.notopen = true;
-
-	function session.reset_stream()
-		session.notopen = true;
-		session.stream:reset();
+	if not wants_xmpp then
+		return 501;
 	end
 
 	local function websocket_close(code, message)
@@ -322,7 +141,6 @@
 		conn:close();
 	end
 
-	local filter = session.filter;
 	local dataBuffer;
 	local function handle_frame(frame)
 		module:log("debug", "Websocket received: %s (%i bytes)", frame.data, #frame.data);
@@ -365,115 +183,58 @@
 			dataBuffer = frame.data;
 		elseif frame.opcode == 0x2 then -- Binary frame
 			websocket_close(1003, "Only text frames are supported");
-			return false;
+			return;
 		elseif frame.opcode == 0x8 then -- Close request
 			websocket_close(1000, "Goodbye");
-			return false;
+			return;
 		elseif frame.opcode == 0x9 then -- Ping frame
 			frame.opcode = 0xA;
 			conn:write(build_frame(frame));
-			return true;
+			return "";
 		else
 			log("warn", "Received frame with unsupported opcode %i", frame.opcode);
-			return true;
+			return "";
 		end
 
 		if frame.FIN then
 			data = dataBuffer;
 			dataBuffer = nil;
 
-			-- COMPAT: Some current client implementations send a self-closing <stream:stream>
-			data, session.self_closing_stream = data:gsub("^(<stream:stream.*)/>$", "%1>");
-			session.self_closing_stream = (session.self_closing_stream == 1)
-
-			data = filter("bytes/in", data);
-			if data then
-				local ok, err = stream:feed(data);
-				if ok then return; end
-				log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
-				session:close("not-well-formed");
-			end
+			return data;
 		end
-		return true;
+		return "";
 	end
 
+	conn:setlistener(c2s_listener);
+	c2s_listener.onconnect(conn);
+
 	local frameBuffer = "";
-	function session.data(data)
+	add_filter(sessions[conn], "bytes/in", function(data)
+		local cache = "";
 		frameBuffer = frameBuffer .. data;
 		local frame, length = parse_frame(frameBuffer);
 
 		while frame do
 			frameBuffer = frameBuffer:sub(length + 1);
-			if not handle_frame(frame) then return; end
+			local result = handle_frame(frame);
+			if not result then return; end
+			cache = cache .. result;
 			frame, length = parse_frame(frameBuffer);
 		end
-	end
-
-	function session.send(s)
-		conn:write(build_frame({ FIN = true, opcode = 0x01, data = tostring(s)}));
-	end
-
-	if c2s_timeout then
-		add_task(c2s_timeout, function ()
-			if session.type == "c2s_unauthed" then
-				session:close("connection-timeout");
-			end
-		end);
-	end
-
-	session.dispatch_stanza = stream_callbacks.handlestanza;
-end
+		return cache;
 
-function listener.onincoming(conn, data)
-	local session = sessions[conn];
-	if session then
-		session.data(data);
-	else
-		listener.onconnect(conn, data);
-		session = sessions[conn];
-		session.data(data);
-	end
-end
-
-function listener.ondisconnect(conn, err)
-	local session = sessions[conn];
-	if session then
-		(session.log or log)("info", "Client disconnected: %s", err or "connection closed");
-		sm_destroy_session(session, err);
-		sessions[conn]  = nil;
-	end
-end
-
-function listener.associate_session(conn, session)
-	sessions[conn] = session;
-end
-
-function handle_request(event, path)
-	local request, response = event.request, event.response;
-
-	if not request.headers.sec_websocket_key then
-		response.headers.content_type = "text/html";
-		return [[<!DOCTYPE html><html><head><title>Websocket</title></head><body>
-			<p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p>
-			</body></html>]];
-	end
-
-	local wants_xmpp = false;
-	(request.headers.sec_websocket_protocol or ""):gsub("([^,]*),?", function (proto)
-		if proto == "xmpp" then wants_xmpp = true; end
 	end);
 
-	if not wants_xmpp then
-		return 501;
-	end
+	add_filter(sessions[conn], "bytes/out", function(data)
+		return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)});
+	end);
 
-	response.conn:setlistener(listener);
 	response.status = "101 Switching Protocols";
-	response.headers.Upgrade = "websocket";
-	response.headers.Connection = "Upgrade";
-	response.headers.Sec_WebSocket_Accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
-	response.headers.Sec_WebSocket_Protocol = "xmpp";
-	response.headers.Access_Control_Allow_Origin = cross_domain;
+	response.headers.upgrade = "websocket";
+	response.headers.connection = "Upgrade";
+	response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
+	response.headers.sec_webSocket_protocol = "xmpp";
+	response.headers.access_control_allow_origin = cross_domain;
 
 	return "";
 end