aboutsummaryrefslogtreecommitdiffstats
path: root/core/presencemanager.lua
blob: 6e27752b0dedb5405cbcede49523f8d12a97f428 (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
-- Prosody IM v0.1
-- Copyright (C) 2008 Matthew Wild
-- Copyright (C) 2008 Waqas Hussain
-- 
-- This program is free software; you can redistribute it and/or
-- modify it under the terms of the GNU General Public License
-- as published by the Free Software Foundation; either version 2
-- of the License, or (at your option) any later version.
-- 
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU General Public License for more details.
-- 
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
--



local log = require "util.logger".init("presencemanager")

local require = require;
local pairs, ipairs = pairs, ipairs;
local t_concat = table.concat;
local s_find = string.find;
local tonumber = tonumber;

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

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

module "presencemanager"

function handle_presence(origin, stanza, from_bare, to_bare, core_route_stanza, inbound)
	local type = stanza.attr.type;
	if type and type ~= "unavailable" then
		if inbound then
			handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
		else
			handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
		end
	elseif not inbound and not stanza.attr.to then
		handle_normal_presence(origin, stanza, core_route_stanza);
	else
		core_route_stanza(origin, stanza);
	end
end

function handle_normal_presence(origin, stanza, core_route_stanza)
	if origin.roster then
		for jid in pairs(origin.roster) do -- broadcast to all interested contacts
			local subscription = origin.roster[jid].subscription;
			if subscription == "both" or subscription == "from" then
				stanza.attr.to = jid;
				core_route_stanza(origin, stanza);
			end
		end
		local node, host = jid_split(stanza.attr.from);
		for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources
			if res ~= origin and res.full_jid then -- to resource. FIXME is res.full_jid the correct check? Maybe it should be res.presence
				stanza.attr.to = res.full_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 in pairs(origin.roster) do -- probe all contacts we are subscribed to
				local subscription = origin.roster[jid].subscription;
				if subscription == "both" or 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 origin.roster.pending then -- resend incoming subscription requests
				for jid in pairs(origin.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(origin.roster) do -- resend outgoing subscription requests
				if item.ask then
					request.attr.to = jid;
					core_route_stanza(origin, request);
				end
			end
			for _, msg in ipairs(offlinemanager.load(node, host) or {}) do
				origin.send(msg); -- FIXME do we need to modify to/from in any way?
			end
			offlinemanager.deleteAll(node, host);
		end
		origin.priority = 0;
		if stanza.attr.type == "unavailable" then
			origin.presence = nil;
		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
					origin.priority = priority;
				end
			end
		end
		stanza.attr.to = nil; -- reset it
	else
		log("error", "presence recieved from client with no roster");
	end
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;
					pres.attr.from = session.full_jid;
					core_route_stanza(session, pres);
					pres.attr.to = nil;
					pres.attr.from = nil;
					count = count + 1;
				end
			end
		end
	end
	log("info", "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, from_bare, 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

return _M;