-- Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

-- 

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

local logger = require "logger";

local log = logger.init("xmppclient_listener");

local lxp = require "lxp"

local init_xmlhandlers = require "core.xmlhandlers"

local sm_new_session = require "core.sessionmanager".new_session;

local connlisteners_register = require "net.connlisteners".register;

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 sessionmanager = require "core.sessionmanager";

local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;

local sm_streamopened = sessionmanager.streamopened;

local sm_streamclosed = sessionmanager.streamclosed;

local st = require "util.stanza";

local config = require "core.configmanager";

local opt_keepalives = config.get("*", "core", "tcp_keepalives");

local stream_callbacks = { default_ns = "jabber:client",

		streamopened = sm_streamopened, streamclosed = sm_streamclosed, handlestanza = core_process_stanza };

local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";

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("xml-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), debug.traceback()); end

function stream_callbacks.handlestanza(a, b)

	xpcall(function () core_process_stanza(a, b) end, handleerr);

end

local sessions = {};

local xmppclient = { default_port = 5222, default_mode = "*a" };

-- These are session methods --

local function session_reset_stream(session)

	-- Reset stream

		local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");

		session.parser = parser;

		session.notopen = true;

		function session.data(conn, data)

			local ok, err = parser:parse(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("xml-not-well-formed");

		end

		return true;

end

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 = "" };

local function session_close(session, reason)

	local log = session.log or log;

	if session.conn then

		if session.notopen then

			session.send("<?xml version='1.0'?>");

			session.send(st.stanza("stream:stream", default_stream_attr):top_tag());

		end

		if reason then

			if type(reason) == "string" then -- assume stream error

				log("info", "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("info", "Disconnecting client, <stream:error> is: %s", tostring(stanza));

					session.send(stanza);

				elseif reason.name then -- a stanza

					log("info", "Disconnecting client, <stream:error> is: %s", tostring(reason));

					session.send(reason);

				end

			end

		end

		session.send("</stream:stream>");

		session.conn:close();

		xmppclient.ondisconnect(session.conn, (reason and (reason.text or reason.condition)) or reason or "session closed");

	end

end

-- End of session methods --

function xmppclient.onincoming(conn, data)

	local session = sessions[conn];

	if not session then

		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 ~= nil then

			conn:setoption("keepalive", opt_keepalives);

		end

		session.reset_stream = session_reset_stream;

		session.close = session_close;

		session_reset_stream(session); -- Initialise, ready for use

		session.dispatch_stanza = stream_callbacks.handlestanza;

	end

	if data then

		session.data(conn, data);

	end

end

function xmppclient.ondisconnect(conn, err)

	local session = sessions[conn];

	if session then

		(session.log or log)("info", "Client disconnected: %s", err);

		sm_destroy_session(session, err);

		sessions[conn]  = nil;

		session = nil;

	end

end

connlisteners_register("xmppclient", xmppclient);