aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/mod_presence.lua
blob: 5618d5898772108acad232f9d5f9767ce8f99e5f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
-- Prosody IM v0.4
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 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, ipairs = pairs, ipairs;
local t_concat, t_insert = table.concat, table.insert;
local s_find = string.find;
local tonumber = tonumber;

local st = require "util.stanza";
local jid_split = require "util.jid".split;
local jid_bare = require "util.jid".bare;
local hosts = hosts;

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

local _core_route_stanza = core_route_stanza;
local core_route_stanza;
function core_route_stanza(origin, stanza)
	if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" and stanza.attr.type ~= "error" then
		local node, host = jid_split(stanza.attr.to);
		host = hosts[host];
		if host and host.type == "local" then
			handle_inbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to), core_route_stanza);
			return;
		end
	end
	_core_route_stanza(origin, stanza);
end

local function select_top_resources(user)
	local priority = 0;
	local recipients = {};
	for _, session in pairs(user.sessions) do -- find resource with greatest priority
		if session.presence then
			-- TODO check active privacy list for session
			local p = session.priority;
			if p > priority then
				priority = p;
				recipients = {session};
			elseif p == priority then
				t_insert(recipients, session);
			end
		end
	end
	return recipients;
end
local function recalc_resource_map(origin)
	local user = hosts[origin.host].sessions[origin.username];
	user.top_resources = select_top_resources(user);
	if #user.top_resources == 0 then user.top_resources = nil; end
end

function handle_normal_presence(origin, stanza, core_route_stanza)
	local roster = origin.roster;
	local node, host = origin.username, origin.host;
	for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources
		if res ~= origin and res.presence then -- to resource
			stanza.attr.to = res.full_jid;
			core_route_stanza(origin, stanza);
		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_route_stanza(origin, stanza);
		end
	end
	if stanza.attr.type == nil and not origin.presence then -- initial presence
		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_route_stanza(origin, probe);
			end
		end
		for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast from all available resources
			if res ~= origin and res.presence then
				res.presence.attr.to = origin.full_jid;
				core_route_stanza(res, res.presence);
				res.presence.attr.to = nil;
			end
		end
		if roster.pending then -- resend incoming subscription requests
			for jid in pairs(roster.pending) do
				origin.send(st.presence({type="subscribe", from=jid})); -- TODO add to attribute? Use original?
			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_route_stanza(origin, request);
			end
		end
		local offline = offlinemanager.load(node, host);
		if offline then
			for _, msg in ipairs(offline) do
				origin.send(msg); -- FIXME do we need to modify to/from in any way?
			end
			offlinemanager.deleteAll(node, host);
		end
	end
	if stanza.attr.type == "unavailable" then
		origin.presence = nil;
		if origin.priority then
			origin.priority = nil;
			recalc_resource_map(origin);
		end
		if origin.directed then
			for jid in pairs(origin.directed) do
				stanza.attr.to = jid;
				core_route_stanza(origin, stanza);
			end
			origin.directed = nil;
		end
	else
		origin.presence = stanza;
		local priority = stanza:child_with_name("priority");
		if priority and #priority > 0 then
			priority = t_concat(priority);
			if 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
		else priority = 0; end
		if origin.priority ~= priority then
			origin.priority = priority;
			recalc_resource_map(origin);
		end
	end
	stanza.attr.to = nil; -- reset it
end

function send_presence_of_available_resources(user, host, jid, recipient_session, core_route_stanza)
	local h = hosts[host];
	local count = 0;
	if h and h.type == "local" then
		local u = h.sessions[user];
		if u then
			for k, session in pairs(u.sessions) do
				local pres = session.presence;
				if pres then
					pres.attr.to = jid;
					core_route_stanza(session, pres);
					pres.attr.to = nil;
					count = count + 1;
				end
			end
		end
	end
	log("debug", "broadcasted presence of "..count.." resources from "..user.."@"..host.." to "..jid);
	return count;
end

function handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza)
	local node, host = jid_split(from_bare);
	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 "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
	if 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_route_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_route_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
		core_route_stanza(origin, stanza);
		send_presence_of_available_resources(node, host, to_bare, origin, core_route_stanza);
	elseif stanza.attr.type == "unsubscribed" then
		-- 1. route stanza
		-- 2. roster push (subscription = none or to)
		if rostermanager.unsubscribed(node, host, to_bare) then
			rostermanager.roster_push(node, host, to_bare);
		end
		core_route_stanza(origin, stanza);
	end
	stanza.attr.from, stanza.attr.to = st_from, st_to;
end

function handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza)
	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 "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
	if stanza.attr.type == "probe" then
		if rostermanager.is_contact_subscribed(node, host, from_bare) then
			if 0 == send_presence_of_available_resources(node, host, st_from, origin, core_route_stanza) then
				-- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too)
			end
		else
			core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="unsubscribed"}));
		end
	elseif stanza.attr.type == "subscribe" then
		if rostermanager.is_contact_subscribed(node, host, from_bare) then
			core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="subscribed"})); -- 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, core_route_stanza) then
				-- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too)
			end
		else
			if not rostermanager.is_contact_pending_in(node, host, from_bare) then
				if rostermanager.set_contact_pending_in(node, host, from_bare) 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
			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
			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
			rostermanager.roster_push(node, host, from_bare);
		end
	end -- discard any other type
	stanza.attr.from, stanza.attr.to = st_from, st_to;
end

local outbound_presence_handler = function(data)
	-- outbound presence recieved
	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
			handle_outbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to), core_route_stanza);
			return true;
		end

		local to_bare = jid_bare(to);
		if not(origin.roster[to_bare] and (origin.roster[to_bare].subscription == "both" or origin.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 recieved
	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
			handle_inbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to), core_route_stanza);
			return true;
		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, core_route_stanza);
	end
	return true;
end);
module:hook("presence/full", function(data)
	-- inbound presence to full JID recieved
	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
		handle_inbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to), core_route_stanza);
		return true;
	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("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 not(err) or err == "closed" then err = "connection closed"; end
		pres:tag("status"):text("Disconnected: "..err):up();
		session:dispatch_stanza(pres);
	elseif session.directed then
		local pres = st.presence{ type = "unavailable" };
		if not(err) or err == "closed" then err = "connection closed"; end
		pres:tag("status"):text("Disconnected: "..err):up();
		for jid in pairs(session.directed) do
			pres.attr.to = jid;
			core_route_stanza(session, pres);
		end
		session.directed = nil;
	end
end);