#!/usr/bin/env lua

-- Prosody IM

-- Copyright (C) 2008-2009 Matthew Wild

-- Copyright (C) 2008-2009 Waqas Hussain

-- Copyright (C) 2010      Stefan Gehn

-- 

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

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

--

-- FIXME: XEP-0227 supports XInclude but luaexpat does not

--

-- XEP-227 elements and their current level of support:

-- Hosts : supported

-- Users : supported

-- Rosters : supported, needs testing

-- Offline Messages : supported, needs testing

-- Private XML Storage : supported, needs testing

-- vCards : supported, needs testing

-- Privacy Lists: UNSUPPORTED

--   http://xmpp.org/extensions/xep-0227.html#privacy-lists

--   mod_privacy uses dm.load(username, host, "privacy"); and stores stanzas 1:1

-- Incoming Subscription Requests : supported

package.path = package.path..";../?.lua";

package.cpath = package.cpath..";../?.so"; -- needed for util.pposix used in datamanager

-- ugly workaround for getting datamanager to work outside of prosody :(

prosody = { };

prosody.platform = "unknown";

if os.getenv("WINDIR") then

	prosody.platform = "windows";

elseif package.config:sub(1,1) == "/" then

	prosody.platform = "posix";

end

local lxp = require "lxp";

local st = require "util.stanza";

local xmppstream = require "util.xmppstream";

local new_xmpp_handlers = xmppstream.new_sax_handlers;

local dm = require "util.datamanager"

dm.set_data_path("data");

local ns_separator = xmppstream.ns_separator;

local ns_pattern = xmppstream.ns_pattern;

local xmlns_xep227 = "http://www.xmpp.org/extensions/xep-0227.html#ns";

-----------------------------------------------------------------------

function store_vcard(username, host, stanza)

	-- create or update vCard for username@host

	local ret, err = dm.store(username, host, "vcard", st.preserialize(stanza));

	print("["..(err or "success").."] stored vCard: "..username.."@"..host);

end

function store_password(username, host, password)

	-- create or update account for username@host

	local ret, err = dm.store(username, host, "accounts", {password = password});

	print("["..(err or "success").."] stored account: "..username.."@"..host.." = "..password);

end

function store_roster(username, host, roster_items)

	-- fetch current roster-table for username@host if he already has one

	local roster = dm.load(username, host, "roster") or {};

	-- merge imported roster-items with loaded roster

		-- jid for this roster-item

		local item_jid = item_tag.attr.jid

		-- validate item stanzas

			-- prepare roster item

			-- TODO: is the subscription attribute optional?

			local item = {subscription = item_tag.attr.subscription, groups = {}};

			-- optional: give roster item a real name

			if item_tag.attr.name then

				item.name = item_tag.attr.name;

			end

			-- optional: iterate over group stanzas inside item stanza

				local group_name = group_tag:get_text();

					item.groups[group_name] = true;

				else

					print("[error] invalid group stanza: "..group_tag:pretty_print());

				end

			end

			-- store item in roster

			roster[item_jid] = item;

			print("[success] roster entry: " ..username.."@"..host.." - "..item_jid);

		else

			print("[error] invalid roster stanza: " ..item_tag:pretty_print());

		end

	end

	-- store merged roster-table

	local ret, err = dm.store(username, host, "roster", roster);

	print("["..(err or "success").."] stored roster: " ..username.."@"..host);

end

function store_private(username, host, private_items)

	local private = dm.load(username, host, "private") or {};

		--print("private :"..ch:pretty_print());

		private[ch.name..":"..ch.attr.xmlns] = st.preserialize(ch);

		print("[success] private item: " ..username.."@"..host.." - "..ch.name);

	end

	local ret, err = dm.store(username, host, "private", private);

	print("["..(err or "success").."] stored private: " ..username.."@"..host);

end

function store_offline_messages(username, host, offline_messages)

	-- TODO: maybe use list_load(), append and list_store() instead

	--       of constantly reopening the file with list_append()?

		--print("message :"..ch:pretty_print());

		local ret, err = dm.list_append(username, host, "offline", st.preserialize(ch));

		print("["..(err or "success").."] stored offline message: " ..username.."@"..host.." - "..ch.attr.from);

	end

end

function store_subscription_request(username, host, presence_stanza)

	local from_bare = presence_stanza.attr.from;

	-- fetch current roster-table for username@host if he already has one

	local roster = dm.load(username, host, "roster") or {};

	local item = roster[from_bare];

	if item and (item.subscription == "from" or item.subscription == "both") then

		return; -- already subscribed, do nothing

	end

	-- add to table of pending subscriptions

	if not roster.pending then roster.pending = {}; end

	roster.pending[from_bare] = true;

	-- store updated roster-table

	local ret, err = dm.store(username, host, "roster", roster);

	print("["..(err or "success").."] stored subscription request: " ..username.."@"..host.." - "..from_bare);

end

-----------------------------------------------------------------------

local curr_host = "";

local user_name = "";

local cb = {

	stream_tag = "user",

	stream_ns = xmlns_xep227,

};

function cb.streamopened(session, attr)

	session.notopen = false;

	user_name = attr.name;

	store_password(user_name, curr_host, attr.password);

end

function cb.streamclosed(session)

	session.notopen = true;

	user_name = "";

end

function cb.handlestanza(session, stanza)

	--print("Parsed stanza "..stanza.name.." xmlns: "..(stanza.attr.xmlns or ""));

	if (stanza.name == "vCard") and (stanza.attr.xmlns == "vcard-temp") then

		store_vcard(user_name, curr_host, stanza);

	elseif (stanza.name == "query") then

		if (stanza.attr.xmlns == "jabber:iq:roster") then

			store_roster(user_name, curr_host, stanza);

		elseif (stanza.attr.xmlns == "jabber:iq:private") then

			store_private(user_name, curr_host, stanza);

		end

	elseif (stanza.name == "offline-messages") then

		store_offline_messages(user_name, curr_host, stanza);

	elseif (stanza.name == "presence") and (stanza.attr.xmlns == "jabber:client") then

		store_subscription_request(user_name, curr_host, stanza);

	else

		print("UNHANDLED stanza "..stanza.name.." xmlns: "..(stanza.attr.xmlns or ""));

	end

end

local user_handlers = new_xmpp_handlers({ notopen = true }, cb);

-----------------------------------------------------------------------

local lxp_handlers = {

	--count = 0

};

-- TODO: error handling for invalid opening elements if curr_host is empty

function lxp_handlers.StartElement(parser, elementname, attributes)

	local curr_ns, name = elementname:match(ns_pattern);

	if name == "" then

		curr_ns, name = "", curr_ns;

	end

	--io.write("+ ", string.rep(" ", count), name, "  (", curr_ns, ")", "\n")

	--count = count + 1;

	if curr_host ~= "" then

		-- forward to xmlhandlers

		user_handlers:StartElement(elementname, attributes);

	elseif (curr_ns == xmlns_xep227) and (name == "host") then

		curr_host = attributes["jid"]; -- start of host element

		print("Begin parsing host "..curr_host);

	elseif (curr_ns ~= xmlns_xep227) or (name ~= "server-data") then

		io.stderr:write("Unhandled XML element: ", name, "\n");

		os.exit(1);

	end

end

-- TODO: error handling for invalid closing elements if host is empty

function lxp_handlers.EndElement(parser, elementname)

	local curr_ns, name = elementname:match(ns_pattern);

	if name == "" then

		curr_ns, name = "", curr_ns;

	end

	--count = count - 1;

	--io.write("- ", string.rep(" ", count), name, "  (", curr_ns, ")", "\n")

	if curr_host ~= "" then

		if (curr_ns == xmlns_xep227) and (name == "host") then

			print("End parsing host "..curr_host);

			curr_host = "" -- end of host element

		else

			-- forward to xmlhandlers

			user_handlers:EndElement(elementname);

		end

	elseif (curr_ns ~= xmlns_xep227) or (name ~= "server-data") then

		io.stderr:write("Unhandled XML element: ", name, "\n");

		os.exit(1);

	end

end

function lxp_handlers.CharacterData(parser, string)

	if curr_host ~= "" then

		-- forward to xmlhandlers

		user_handlers:CharacterData(string);

	end

end

-----------------------------------------------------------------------

local arg = ...;

local help = "/? -? ? /h -h /help -help --help";

if not arg or help:find(arg, 1, true) then

	print([[XEP-227 importer for Prosody

  Usage: xep227toprosody.lua filename.xml

]]);

	os.exit(1);

end

local file = io.open(arg);

if not file then

	io.stderr:write("Could not open file: ", arg, "\n");

	os.exit(0);

end

local parser = lxp.new(lxp_handlers, ns_separator);

for l in file:lines() do

	parser:parse(l);

end

parser:parse();

parser:close();

file:close();