-- 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 "prosody.core.hostmanager".get_children;

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

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

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

local st = require "prosody.util.stanza"

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

local expose_admins = module:get_option_boolean("disco_expose_admins", false);

local disco_items = module:get_option_array("disco_items", {})

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

if module:get_host_type() == "local" then

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

end

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-get/host/http://jabber.org/protocol/disco#info:query", function(event)

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

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

	if node and node ~= "" and node ~= "http://prosody.im#"..get_server_caps_hash() then

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

		local node_event = { origin = origin, stanza = stanza, reply = reply, node = node, exists = false};

		local ret = module:fire_event("host-disco-info-node", node_event);

		if ret ~= nil then return ret; end

		if node_event.exists then

			origin.send(reply);

		else

			origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Node does not exist"));

		end

		return true;

	end

	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-get/host/http://jabber.org/protocol/disco#items:query", function(event)

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

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

	if node and node ~= "" then

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

		local node_event = { origin = origin, stanza = stanza, reply = reply, node = node, exists = false};

		local ret = module:fire_event("host-disco-items-node", node_event);

		if ret ~= nil then return ret; end

		if node_event.exists then

			origin.send(reply);

		else

			origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Node does not exist"));

		end

		return true;

	end

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

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

	if ret ~= nil then return ret; end

	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" or event.origin.type == "c2s_unbound" then

		event.features:add_child(get_server_caps_feature());

	end

end);

module:hook("s2s-stream-features", function (event)

	if event.origin.type == "s2sin" then

		event.features:add_child(get_server_caps_feature());

	end

end);

module:default_permission("prosody:admin", ":be-discovered-admin");

-- Handle disco requests to user accounts

if module:get_host_type() ~= "local" then	return end -- skip for components

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

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

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

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

	local target_is_admin = module:may(":be-discovered-admin", stanza.attr.to or origin.full_jid);

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

		if node and node ~= "" then

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

			reply:tag("feature", { var = "http://jabber.org/protocol/disco#info" }):up();

			reply:tag("feature", { var = "http://jabber.org/protocol/disco#items" }):up();

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

			local node_event = { origin = origin, stanza = stanza, reply = reply, node = node, exists = false};

			local ret = module:fire_event("account-disco-info-node", node_event);

			if ret ~= nil then return ret; end

			if node_event.exists then

				origin.send(reply);

			else

				origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Node does not exist"));

			end

			return true;

		end

		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

		if target_is_admin then

			reply:tag('identity', {category='account', type='admin'}):up();

		elseif prosody.hosts[module.host].users.name == "anonymous" then

			reply:tag('identity', {category='account', type='anonymous'}):up();

		else

			reply:tag('identity', {category='account', type='registered'}):up();

		end

		reply:tag("feature", { var = "http://jabber.org/protocol/disco#info" }):up();

		reply:tag("feature", { var = "http://jabber.org/protocol/disco#items" }):up();

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

		origin.send(reply);

		return true;

	end

end);

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

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

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

	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

		if node and node ~= "" then

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

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

			local node_event = { origin = origin, stanza = stanza, reply = reply, node = node, exists = false};

			local ret = module:fire_event("account-disco-items-node", node_event);

			if ret ~= nil then return ret; end

			if node_event.exists then

				origin.send(reply);

			else

				origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Node does not exist"));

			end

			return true;

		end

		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 = stanza, reply = reply });

		origin.send(reply);

		return true;

	end

end);