-- 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 get_children = require "core.hostmanager".get_children;

local is_contact_subscribed = require "core.rostermanager".is_contact_subscribed;

local jid_split = require "util.jid".split;

local jid_bare = require "util.jid".bare;

local st = require "util.stanza"

local calculate_hash = require "util.caps".calculate_hash;

local disco_items = module:get_option("disco_items") or {};

do -- validate disco_items

	for _, item in ipairs(disco_items) do

		local err;

		if type(item) ~= "table" then

			err = "item is not a table";

		elseif type(item[1]) ~= "string" then

			err = "item jid is not a string";

		elseif item[2] and type(item[2]) ~= "string" then

			err = "item name is not a string";

		end

		if err then

			module:log("error", "option disco_items is malformed: %s", err);

			disco_items = {}; -- TODO clean up data instead of removing it?

			break;

		end

	end

end

module:add_identity("server", "im", module:get_option_string("name", "Prosody")); -- FIXME should be in the non-existing mod_router

module:add_feature("http://jabber.org/protocol/disco#info");

module:add_feature("http://jabber.org/protocol/disco#items");

-- Generate and cache disco result and caps hash

local _cached_server_disco_info, _cached_server_caps_feature, _cached_server_caps_hash;

local function build_server_disco_info()

	local query = st.stanza("query", { xmlns = "http://jabber.org/protocol/disco#info" });

	local done = {};

	for _,identity in ipairs(module:get_host_items("identity")) do

		local identity_s = identity.category.."\0"..identity.type;

		if not done[identity_s] then

			query:tag("identity", identity):up();

			done[identity_s] = true;

		end

	end

	for _,feature in ipairs(module:get_host_items("feature")) do

		if not done[feature] then

			query:tag("feature", {var=feature}):up();

			done[feature] = true;

		end

	end

	for _,extension in ipairs(module:get_host_items("extension")) do

		if not done[extension] then

			query:add_child(extension);

			done[extension] = true;

		end

	end

	_cached_server_disco_info = query;

	_cached_server_caps_hash = calculate_hash(query);

	_cached_server_caps_feature = st.stanza("c", {

		xmlns = "http://jabber.org/protocol/caps";

		hash = "sha-1";

		node = "http://prosody.im";

		ver = _cached_server_caps_hash;

	});

end

local function clear_disco_cache()

	_cached_server_disco_info, _cached_server_caps_feature, _cached_server_caps_hash = nil, nil, nil;

end

local function get_server_disco_info()

	if not _cached_server_disco_info then build_server_disco_info(); end

	return _cached_server_disco_info;

end

local function get_server_caps_feature()

	if not _cached_server_caps_feature then build_server_disco_info(); end

	return _cached_server_caps_feature;

end

local function get_server_caps_hash()

	if not _cached_server_caps_hash then build_server_disco_info(); end

	return _cached_server_caps_hash;

end

module:hook("item-added/identity", clear_disco_cache);

module:hook("item-added/feature", clear_disco_cache);

module:hook("item-added/extension", clear_disco_cache);

module:hook("item-removed/identity", clear_disco_cache);

module:hook("item-removed/feature", clear_disco_cache);

module:hook("item-removed/extension", clear_disco_cache);

-- Handle disco requests to the server

module:hook("iq/host/http://jabber.org/protocol/disco#info:query", function(event)

	local origin, stanza = event.origin, event.stanza;

	if stanza.attr.type ~= "get" then return; end

	local node = stanza.tags[1].attr.node;

	if node and node ~= "" and node ~= "http://prosody.im#"..get_server_caps_hash() then return; end -- TODO fire event?

	local reply_query = get_server_disco_info();

	reply_query.attr.node = node;

	local reply = st.reply(stanza):add_child(reply_query);

	origin.send(reply);

	return true;

end);

module:hook("iq/host/http://jabber.org/protocol/disco#items:query", function(event)

	local origin, stanza = event.origin, event.stanza;

	if stanza.attr.type ~= "get" then return; end

	local node = stanza.tags[1].attr.node;

	if node and node ~= "" then return; end -- TODO fire event?

	local reply = st.reply(stanza):query("http://jabber.org/protocol/disco#items");

	for jid, name in pairs(get_children(module.host)) do

		reply:tag("item", {jid = jid, name = name~=true and name or nil}):up();

	end

	for _, item in ipairs(disco_items) do

		reply:tag("item", {jid=item[1], name=item[2]}):up();

	end

	origin.send(reply);

	return true;

end);

-- Handle caps stream feature

module:hook("stream-features", function (event)

	if event.origin.type == "c2s" then

		event.features:add_child(get_server_caps_feature());

	end

end);

-- Handle disco requests to user accounts

module:hook("iq/bare/http://jabber.org/protocol/disco#info:query", function(event)

	local origin, stanza = event.origin, event.stanza;

	if stanza.attr.type ~= "get" then return; end

	local node = stanza.tags[1].attr.node;

	if node and node ~= "" then return; end -- TODO fire event?

	local username = jid_split(stanza.attr.to) or origin.username;

	if not stanza.attr.to or is_contact_subscribed(username, module.host, jid_bare(stanza.attr.from)) then

		local reply = st.reply(stanza):tag('query', {xmlns='http://jabber.org/protocol/disco#info'});

		if not reply.attr.from then reply.attr.from = origin.username.."@"..origin.host; end -- COMPAT To satisfy Psi when querying own account

		module:fire_event("account-disco-info", { origin = origin, stanza = reply });

		origin.send(reply);

		return true;

	end

end);

module:hook("iq/bare/http://jabber.org/protocol/disco#items:query", function(event)

	local origin, stanza = event.origin, event.stanza;

	if stanza.attr.type ~= "get" then return; end

	local node = stanza.tags[1].attr.node;

	if node and node ~= "" then return; end -- TODO fire event?

	local username = jid_split(stanza.attr.to) or origin.username;

	if not stanza.attr.to or is_contact_subscribed(username, module.host, jid_bare(stanza.attr.from)) then

		local reply = st.reply(stanza):tag('query', {xmlns='http://jabber.org/protocol/disco#items'});

		if not reply.attr.from then reply.attr.from = origin.username.."@"..origin.host; end -- COMPAT To satisfy Psi when querying own account

		module:fire_event("account-disco-items", { origin = origin, stanza = reply });

		origin.send(reply);

		return true;

	end

end);