File

plugins/mod_disco.lua @ 11906:ba3344926e18

MUC: Add option to include form in registration query This was originally not done based on my interpretation of XEP-0045. Today's reading, however, revealed that it actually says the result > SHOULD contain **at least** a <username/> element (emphasis mine) I take this to mean that including a form **is** allowed (and I think this is sensible). Tigase already includes the form I believe. I've gated the new behaviour behind a (default off) option, because it hasn't been tested for compatibility with clients. My primary desire for it is in Snikket, where the clients will be tested to ensure compatibility with this. I don't anticipate that (m)any clients would break, so maybe after 0.12 we can experiment with enabling it by default and eventually remove the option.
author Matthew Wild <mwild1@gmail.com>
date Mon, 15 Nov 2021 16:11:03 +0000
parent 11737:59cf555b4698
child 12015:b4db17aeff01
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-- 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_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 non-existing 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);

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