File

plugins/mod_presence.lua @ 10813:4a9ff4f61796

mod_presence: Send unavailable presence in current thread run `session:dispatch_stanza(pres)` enqueues processing of the stanza in the sessions async thread, but becasue the entire stream close handling is now in that thread it would process the presence after the stream and session was completely closed, leading to weird errors "sent to a resting session". We call core_process_stanza() since this is what :dispatch_stanza calls in the end.
author Kim Alvefur <zash@zash.se>
date Sat, 09 May 2020 00:28:10 +0200
parent 10694:0cda5d597607
child 12977:74b9e05af71e
line wrap: on
line source

-- 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 log = module._log;

local require = require;
local pairs = pairs;
local s_find = string.find;
local tonumber = tonumber;

local core_post_stanza = prosody.core_post_stanza;
local core_process_stanza = prosody.core_process_stanza;
local st = require "util.stanza";
local jid_split = require "util.jid".split;
local jid_bare = require "util.jid".bare;
local datetime = require "util.datetime";
local hosts = prosody.hosts;
local bare_sessions = prosody.bare_sessions;
local full_sessions = prosody.full_sessions;
local NULL = {};

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

local recalc_resource_map = require "util.presence".recalc_resource_map;

local ignore_presence_priority = module:get_option_boolean("ignore_presence_priority", false);

local pre_approval_stream_feature = st.stanza("sub", {xmlns="urn:xmpp:features:pre-approval"});
module:hook("stream-features", function(event)
	local origin, features = event.origin, event.features;
	if origin.username then
		features:add_child(pre_approval_stream_feature);
	end
end);

function handle_normal_presence(origin, stanza)
	if ignore_presence_priority then
		local priority = stanza:get_child("priority");
		if priority and priority[1] ~= "0" then
			for i=#priority.tags,1,-1 do priority.tags[i] = nil; end
			for i=#priority,2,-1 do priority[i] = nil; end
			priority[1] = "0";
		end
	end
	local priority = stanza:get_child_text("priority");
	if priority and s_find(priority, "^[+-]?[0-9]+$") then
		priority = tonumber(priority);
		if priority < -128 then priority = -128 end
		if priority > 127 then priority = 127 end
	else priority = 0; end
	if full_sessions[origin.full_jid] then -- if user is still connected
		origin.send(stanza); -- reflect their presence back to them
	end
	local roster = origin.roster;
	local node, host = origin.username, origin.host;
	local user = bare_sessions[node.."@"..host];
	for _, res in pairs(user and user.sessions or NULL) do -- broadcast to all resources
		if res ~= origin and res.presence then -- to resource
			stanza.attr.to = res.full_jid;
			core_post_stanza(origin, stanza, true);
		end
	end
	for jid, item in pairs(roster) do -- broadcast to all interested contacts
		if item.subscription == "both" or item.subscription == "from" then
			stanza.attr.to = jid;
			core_post_stanza(origin, stanza, true);
		end
	end
	stanza.attr.to = nil;
	if stanza.attr.type == nil and not origin.presence then -- initial presence
		module:fire_event("presence/initial", { origin = origin, stanza = stanza } );
		origin.presence = stanza; -- FIXME repeated later
		local probe = st.presence({from = origin.full_jid, type = "probe"});
		for jid, item in pairs(roster) do -- probe all contacts we are subscribed to
			if item.subscription == "both" or item.subscription == "to" then
				probe.attr.to = jid;
				core_post_stanza(origin, probe, true);
			end
		end
		for _, res in pairs(user and user.sessions or NULL) do -- broadcast from all available resources
			if res ~= origin and res.presence then
				res.presence.attr.to = origin.full_jid;
				core_post_stanza(res, res.presence, true);
				res.presence.attr.to = nil;
			end
		end
		for jid, pending_request in pairs(roster[false].pending) do -- resend incoming subscription requests
			if type(pending_request) == "table" then
				local subscribe = st.deserialize(pending_request);
				subscribe.attr.type, subscribe.attr.from = "subscribe", jid;
				origin.send(subscribe);
			else
				origin.send(st.presence({type="subscribe", from=jid}));
			end
		end
		local request = st.presence({type="subscribe", from=origin.username.."@"..origin.host});
		for jid, item in pairs(roster) do -- resend outgoing subscription requests
			if item.ask then
				request.attr.to = jid;
				core_post_stanza(origin, request, true);
			end
		end

		if priority >= 0 then
			local event = { origin = origin }
			module:fire_event('message/offline/broadcast', event);
		end
	end
	if stanza.attr.type == "unavailable" then
		origin.presence = nil;
		if origin.priority then
			origin.priority = nil;
			recalc_resource_map(user);
		end
		if origin.directed then
			for jid in pairs(origin.directed) do
				stanza.attr.to = jid;
				core_post_stanza(origin, stanza, true);
			end
			origin.directed = nil;
		end
	else
		origin.presence = stanza;
		stanza:tag("delay", { xmlns = "urn:xmpp:delay", from = host, stamp = datetime.datetime() }):up();
		if origin.priority ~= priority then
			origin.priority = priority;
			recalc_resource_map(user);
		end
	end
	stanza.attr.to = nil; -- reset it
end

-- luacheck: ignore 212/recipient_session
-- TODO This argument is used in 3rd party modules
function send_presence_of_available_resources(user, host, jid, recipient_session, stanza)
	local h = hosts[host];
	local count = 0;
	if h and h.type == "local" then
		local u = h.sessions[user];
		if u then
			for _, session in pairs(u.sessions) do
				local pres = session.presence;
				if pres then
					if stanza then pres = stanza; pres.attr.from = session.full_jid; end
					pres.attr.to = jid;
					core_post_stanza(session, pres, true);
					pres.attr.to = nil;
					count = count + 1;
				end
			end
		end
	end
	log("debug", "broadcasted presence of %d resources from %s@%s to %s", count, user, host, jid);
	return count;
end

function handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare)
	local node, host = jid_split(from_bare);
	if to_bare == from_bare then return; end -- No self contacts
	local st_from, st_to = stanza.attr.from, stanza.attr.to;
	stanza.attr.from, stanza.attr.to = from_bare, to_bare;
	log("debug", "outbound presence %s from %s for %s", stanza.attr.type, from_bare, to_bare);
	if stanza.attr.type == "probe" then
		stanza.attr.from, stanza.attr.to = st_from, st_to;
		return;
	elseif stanza.attr.type == "subscribe" then
		-- 1. route stanza
		-- 2. roster push (subscription = none, ask = subscribe)
		if rostermanager.set_contact_pending_out(node, host, to_bare) then
			rostermanager.roster_push(node, host, to_bare);
		end -- else file error
		core_post_stanza(origin, stanza);
	elseif stanza.attr.type == "unsubscribe" then
		-- 1. route stanza
		-- 2. roster push (subscription = none or from)
		if rostermanager.unsubscribe(node, host, to_bare) then
			rostermanager.roster_push(node, host, to_bare); -- FIXME do roster push when roster has in fact not changed?
		end -- else file error
		core_post_stanza(origin, stanza);
	elseif stanza.attr.type == "subscribed" then
		-- 1. route stanza
		-- 2. roster_push ()
		-- 3. send_presence_of_available_resources
		if rostermanager.subscribed(node, host, to_bare) then
			rostermanager.roster_push(node, host, to_bare);
		end
		if rostermanager.is_contact_subscribed(node, host, to_bare) then
			core_post_stanza(origin, stanza);
			send_presence_of_available_resources(node, host, to_bare, origin);
		end
		if rostermanager.is_user_subscribed(node, host, to_bare) then
			core_post_stanza(origin, st.presence({ type = "probe", from = from_bare, to = to_bare }));
		end
	elseif stanza.attr.type == "unsubscribed" then
		-- 1. send unavailable
		-- 2. route stanza
		-- 3. roster push (subscription = from or both)
		-- luacheck: ignore 211/pending_in
		-- Is pending_in meant to be used?
		local success, pending_in, subscribed = rostermanager.unsubscribed(node, host, to_bare);
		if success then
			if subscribed then
				rostermanager.roster_push(node, host, to_bare);
			end
			core_post_stanza(origin, stanza);
			if subscribed then
				send_presence_of_available_resources(node, host, to_bare, origin, st.presence({ type = "unavailable" }));
			end
		end
	else
		origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid presence type"));
	end
	stanza.attr.from, stanza.attr.to = st_from, st_to;
	return true;
end

function handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare)
	local node, host = jid_split(to_bare);
	local st_from, st_to = stanza.attr.from, stanza.attr.to;
	stanza.attr.from, stanza.attr.to = from_bare, to_bare;
	log("debug", "inbound presence %s from %s for %s", stanza.attr.type, from_bare, to_bare);

	if stanza.attr.type == "probe" then
		local result, err = rostermanager.is_contact_subscribed(node, host, from_bare);
		if result then
			if 0 == send_presence_of_available_resources(node, host, st_from, origin) then
				core_post_stanza(hosts[host], st.presence({from=to_bare, to=st_from, type="unavailable"}), true); -- TODO send last activity
			end
		elseif not err then
			core_post_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="unsubscribed"}), true);
		end
	elseif stanza.attr.type == "subscribe" then
		if rostermanager.is_contact_subscribed(node, host, from_bare) then
			core_post_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="subscribed"}), true); -- already subscribed
			-- Sending presence is not clearly stated in the RFC, but it seems appropriate
			if 0 == send_presence_of_available_resources(node, host, from_bare, origin) then
				core_post_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="unavailable"}), true); -- TODO send last activity
			end
		elseif rostermanager.is_contact_preapproved(node, host, from_bare) then
			if not rostermanager.is_contact_pending_in(node, host, from_bare) then
				if rostermanager.set_contact_pending_in(node, host, from_bare, stanza) then
					core_post_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="subscribed"}), true);
				end -- TODO else return error, unable to save
			end
		else
			core_post_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="unavailable"}), true); -- acknowledging receipt
			if not rostermanager.is_contact_pending_in(node, host, from_bare) then
				if rostermanager.set_contact_pending_in(node, host, from_bare, stanza) then
					sessionmanager.send_to_available_resources(node, host, stanza);
				end -- TODO else return error, unable to save
			end
		end
	elseif stanza.attr.type == "unsubscribe" then
		if rostermanager.process_inbound_unsubscribe(node, host, from_bare) then
			sessionmanager.send_to_interested_resources(node, host, stanza);
			rostermanager.roster_push(node, host, from_bare);
		end
	elseif stanza.attr.type == "subscribed" then
		if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then
			sessionmanager.send_to_interested_resources(node, host, stanza);
			rostermanager.roster_push(node, host, from_bare);
		end
	elseif stanza.attr.type == "unsubscribed" then
		if rostermanager.process_inbound_subscription_cancellation(node, host, from_bare) then
			sessionmanager.send_to_interested_resources(node, host, stanza);
			rostermanager.roster_push(node, host, from_bare);
		end
	else
		origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid presence type"));
	end
	stanza.attr.from, stanza.attr.to = st_from, st_to;
	return true;
end

local outbound_presence_handler = function(data)
	-- outbound presence received
	local origin, stanza = data.origin, data.stanza;

	local to = stanza.attr.to;
	if to then
		local t = stanza.attr.type;
		if t ~= nil and t ~= "unavailable" and t ~= "error" then -- check for subscriptions and probes
			return handle_outbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to));
		end

		local to_bare = jid_bare(to);
		local roster = origin.roster;
		if roster and not(roster[to_bare] and (roster[to_bare].subscription == "both" or roster[to_bare].subscription == "from")) then -- directed presence
			origin.directed = origin.directed or {};
			if t then -- removing from directed presence list on sending an error or unavailable
				origin.directed[to] = nil; -- FIXME does it make more sense to add to_bare rather than to?
			else
				origin.directed[to] = true; -- FIXME does it make more sense to add to_bare rather than to?
			end
		end
	end -- TODO maybe handle normal presence here, instead of letting it pass to incoming handlers?
end

module:hook("pre-presence/full", outbound_presence_handler);
module:hook("pre-presence/bare", outbound_presence_handler);
module:hook("pre-presence/host", outbound_presence_handler);

module:hook("presence/bare", function(data)
	-- inbound presence to bare JID received
	local origin, stanza = data.origin, data.stanza;

	local to = stanza.attr.to;
	local t = stanza.attr.type;
	if to then
		if t ~= nil and t ~= "unavailable" and t ~= "error" then -- check for subscriptions and probes sent to bare JID
			return handle_inbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to));
		end

		local user = bare_sessions[to];
		if user then
			for _, session in pairs(user.sessions) do
				if session.presence then -- only send to available resources
					session.send(stanza);
				end
			end
		end -- no resources not online, discard
	elseif not t or t == "unavailable" then
		handle_normal_presence(origin, stanza);
	else
		origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid presence type"));
	end
	return true;
end);
module:hook("presence/full", function(data)
	-- inbound presence to full JID received
	local origin, stanza = data.origin, data.stanza;

	local t = stanza.attr.type;
	if t ~= nil and t ~= "unavailable" and t ~= "error" then -- check for subscriptions and probes sent to full JID
		return handle_inbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to));
	end

	local session = full_sessions[stanza.attr.to];
	if session then
		-- TODO fire post processing event
		session.send(stanza);
	end -- resource not online, discard
	return true;
end);
module:hook("presence/host", function(data)
	-- inbound presence to the host
	local stanza = data.stanza;

	local from_bare = jid_bare(stanza.attr.from);
	local t = stanza.attr.type;
	if t == "probe" then
		core_post_stanza(hosts[module.host], st.presence({ from = module.host, to = from_bare, id = stanza.attr.id }));
	elseif t == "subscribe" then
		core_post_stanza(hosts[module.host], st.presence({ from = module.host, to = from_bare, id = stanza.attr.id, type = "subscribed" }));
		core_post_stanza(hosts[module.host], st.presence({ from = module.host, to = from_bare, id = stanza.attr.id }));
	end
	return true;
end);

module:hook("resource-unbind", function(event)
	local session, err = event.session, event.error;
	-- Send unavailable presence
	if session.presence then
		local pres = st.presence{ type = "unavailable" };
		if err then
			pres:tag("status"):text("Disconnected: "..err):up();
		end
		core_process_stanza(session, pres);
	elseif session.directed then
		local pres = st.presence{ type = "unavailable", from = session.full_jid };
		if err then
			pres:tag("status"):text("Disconnected: "..err):up();
		end
		for jid in pairs(session.directed) do
			pres.attr.to = jid;
			core_post_stanza(session, pres, true);
		end
		session.directed = nil;
	end
end);

module:hook("roster-item-removed", function (event)
	local username = event.username;
	local session = event.origin;
	local roster = event.roster or session and session.roster;
	local jid = event.jid;
	local item = event.item;
	local from_jid = session.full_jid or (username .. "@" .. module.host);

	local subscription = item and item.subscription or "none";
	local ask = item and item.ask;
	local pending = roster and roster[false].pending[jid];

	if subscription == "both" or subscription == "from" or pending then
		core_post_stanza(session, st.presence({type="unsubscribed", from=from_jid, to=jid}));
	end

	if subscription == "both" or subscription == "to" or ask then
		send_presence_of_available_resources(username, module.host, jid, session, st.presence({type="unavailable"}));
		core_post_stanza(session, st.presence({type="unsubscribe", from=from_jid, to=jid}));
	end

end, -1);