aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/mod_pep.lua
blob: bc20fc77dfa14e0321d00dfbc1d895fdee5c87a0 (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
-- 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 jid_bare = require "util.jid".bare;
local jid_split = require "util.jid".split;
local st = require "util.stanza";
local hosts = hosts;
local user_exists = require "core.usermanager".user_exists;
local is_contact_subscribed = require "core.rostermanager".is_contact_subscribed;
local pairs, ipairs = pairs, ipairs;
local next = next;
local type = type;
local sha1 = require "util.hashes".sha1;
local base64 = require "util.encodings".base64.encode;

local NULL = {};
local data = {};
local recipients = {};
local hash_map = {};

module.save = function()
	return { data = data, recipients = recipients, hash_map = hash_map };
end
module.restore = function(state)
	data = state.data or {};
	recipients = state.recipients or {};
	hash_map = state.hash_map or {};
end

module:add_identity("pubsub", "pep", "Prosody");
module:add_feature("http://jabber.org/protocol/pubsub#publish");

local function subscription_presence(user_bare, recipient)
	local recipient_bare = jid_bare(recipient);
	if (recipient_bare == user_bare) then return true end
	local username, host = jid_split(user_bare);
	return is_contact_subscribed(username, host, recipient_bare);
end

local function publish(session, node, id, item)
	item.attr.xmlns = nil;
	local disable = #item.tags ~= 1 or #item.tags[1] == 0;
	if #item.tags == 0 then item.name = "retract"; end
	local bare = session.username..'@'..session.host;
	local stanza = st.message({from=bare, type='headline'})
		:tag('event', {xmlns='http://jabber.org/protocol/pubsub#event'})
			:tag('items', {node=node})
				:add_child(item)
			:up()
		:up();

	-- store for the future
	local user_data = data[bare];
	if disable then
		if user_data then
			user_data[node] = nil;
			if not next(user_data) then data[bare] = nil; end
		end
	else
		if not user_data then user_data = {}; data[bare] = user_data; end
		user_data[node] = {id or "1", item};
	end

	-- broadcast
	for recipient, notify in pairs(recipients[bare] or NULL) do
		if notify[node] then
			stanza.attr.to = recipient;
			core_post_stanza(session, stanza);
		end
	end
end
local function publish_all(user, recipient, session)
	local d = data[user];
	local notify = recipients[user] and recipients[user][recipient];
	if d and notify then
		for node in pairs(notify) do
			if d[node] then
				local id, item = unpack(d[node]);
				session.send(st.message({from=user, to=recipient, type='headline'})
					:tag('event', {xmlns='http://jabber.org/protocol/pubsub#event'})
						:tag('items', {node=node})
							:add_child(item)
						:up()
					:up());
			end
		end
	end
end

local function get_caps_hash_from_presence(stanza, current)
	local t = stanza.attr.type;
	if not t then
		for _, child in pairs(stanza.tags) do
			if child.name == "c" and child.attr.xmlns == "http://jabber.org/protocol/caps" then
				local attr = child.attr;
				if attr.hash then -- new caps
					if attr.hash == 'sha-1' and attr.node and attr.ver then return attr.ver, attr.node.."#"..attr.ver; end
				else -- legacy caps
					if attr.node and attr.ver then return attr.node.."#"..attr.ver.."#"..(attr.ext or ""), attr.node.."#"..attr.ver; end
				end
				return; -- bad caps format
			end
		end
	elseif t == "unavailable" or t == "error" then
		return;
	end
	return current; -- no caps, could mean caps optimization, so return current
end

module:hook("presence/bare", function(event)
	-- inbound presence to bare JID recieved
	local origin, stanza = event.origin, event.stanza;
	local user = stanza.attr.to or (origin.username..'@'..origin.host);

	if not stanza.attr.to or subscription_presence(user, stanza.attr.from) then
		local recipient = stanza.attr.from;
		local current = recipients[user] and recipients[user][recipient];
		local hash = get_caps_hash_from_presence(stanza, current);
		if current == hash then return; end
		if not hash then
			if recipients[user] then recipients[user][recipient] = nil; end
		else
			recipients[user] = recipients[user] or {};
			if hash_map[hash] then
				recipients[user][recipient] = hash_map[hash];
				publish_all(user, recipient, origin);
			else
				recipients[user][recipient] = hash;
				origin.send(
					st.stanza("iq", {from=stanza.attr.to, to=stanza.attr.from, id="disco", type="get"})
						:query("http://jabber.org/protocol/disco#info")
				);
			end
		end
	end
end, 10);

module:hook("iq/bare/http://jabber.org/protocol/pubsub:pubsub", function(event)
	local session, stanza = event.origin, event.stanza;
	local payload = stanza.tags[1];

	if stanza.attr.type == 'set' and (not stanza.attr.to or jid_bare(stanza.attr.from) == stanza.attr.to) then
		payload = payload.tags[1];
		if payload and (payload.name == 'publish' or payload.name == 'retract') and payload.attr.node then -- <publish node='http://jabber.org/protocol/tune'>
			local node = payload.attr.node;
			payload = payload.tags[1];
			if payload and payload.name == "item" then -- <item>
				local id = payload.attr.id;
				session.send(st.reply(stanza));
				publish(session, node, id, st.clone(payload));
				return true;
			end
		end
	elseif stanza.attr.type == 'get' then
		local user = stanza.attr.to and jid_bare(stanza.attr.to) or session.username..'@'..session.host;
		if subscription_presence(user, stanza.attr.from) then
			local user_data = data[user];
			local node, requested_id;
			payload = payload.tags[1];
			if payload and payload.name == 'items' then
				node = payload.attr.node;
				local item = payload.tags[1];
				if item and item.name == "item" then
					requested_id = item.attr.id;
				end
			end
			if node and user_data and user_data[node] then -- Send the last item
				local id, item = unpack(user_data[node]);
				if not requested_id or id == requested_id then
					local stanza = st.reply(stanza)
						:tag('pubsub', {xmlns='http://jabber.org/protocol/pubsub'})
							:tag('items', {node=node})
								:add_child(item)
							:up()
						:up();
					session.send(stanza);
					return true;
				else -- requested item doesn't exist
					local stanza = st.reply(stanza)
						:tag('pubsub', {xmlns='http://jabber.org/protocol/pubsub'})
							:tag('items', {node=node})
						:up();
					session.send(stanza);
					return true;
				end
			elseif node then -- node doesn't exist
				session.send(st.error_reply(stanza, 'cancel', 'item-not-found'));
				return true;
			else --invalid request
				session.send(st.error_reply(stanza, 'modify', 'bad-request'));
				return true;
			end
		else --no presence subscription
			session.send(st.error_reply(stanza, 'auth', 'not-authorized')
				:tag('presence-subscription-required', {xmlns='http://jabber.org/protocol/pubsub#errors'}));
			return true;
		end
	end
end);

local function calculate_hash(disco_info)
	local identities, features, extensions = {}, {}, {};
	for _, tag in pairs(disco_info) do
		if tag.name == "identity" then
			table.insert(identities, (tag.attr.category or "").."\0"..(tag.attr.type or "").."\0"..(tag.attr["xml:lang"] or "").."\0"..(tag.attr.name or ""));
		elseif tag.name == "feature" then
			table.insert(features, tag.attr.var or "");
		elseif tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then
			local form = {};
			local FORM_TYPE;
			for _, field in pairs(tag.tags) do
				if field.name == "field" and field.attr.var then
					local values = {};
					for _, val in pairs(field.tags) do
						val = #val.tags == 0 and table.concat(val); -- FIXME use get_text?
						if val then table.insert(values, val); end
					end
					table.sort(values);
					if field.attr.var == "FORM_TYPE" then
						FORM_TYPE = values[1];
					elseif #values > 0 then
						table.insert(form, field.attr.var.."\0"..table.concat(values, "<"));
					else
						table.insert(form, field.attr.var);
					end
				end
			end
			table.sort(form);
			form = table.concat(form, "<");
			if FORM_TYPE then form = FORM_TYPE.."\0"..form; end
			table.insert(extensions, form);
		end
	end
	table.sort(identities);
	table.sort(features);
	table.sort(extensions);
	if #identities > 0 then identities = table.concat(identities, "<"):gsub("%z", "/").."<"; else identities = ""; end
	if #features > 0 then features = table.concat(features, "<").."<"; else features = ""; end
	if #extensions > 0 then extensions = table.concat(extensions, "<"):gsub("%z", "<").."<"; else extensions = ""; end
	local S = identities..features..extensions;
	local ver = base64(sha1(S));
	return ver, S;
end

module:hook("iq/bare/disco", function(event)
	local session, stanza = event.origin, event.stanza;
	if stanza.attr.type == "result" then
		local disco = stanza.tags[1];
		if disco and disco.name == "query" and disco.attr.xmlns == "http://jabber.org/protocol/disco#info" then
			-- Process disco response
			local user = stanza.attr.to or (session.username..'@'..session.host);
			local contact = stanza.attr.from;
			local current = recipients[user] and recipients[user][contact];
			if type(current) ~= "string" then return; end -- check if waiting for recipient's response
			local ver = current;
			if not string.find(current, "#") then
				ver = calculate_hash(disco.tags); -- calculate hash
			end
			local notify = {};
			for _, feature in pairs(disco.tags) do
				if feature.name == "feature" and feature.attr.var then
					local nfeature = feature.attr.var:match("^(.*)%+notify$");
					if nfeature then notify[nfeature] = true; end
				end
			end
			hash_map[ver] = notify; -- update hash map
			recipients[user][contact] = notify; -- set recipient's data to calculated data
			-- send messages to recipient
			publish_all(user, contact, session);
		end
	end
end);

module:hook("account-disco-info", function(event)
	local stanza = event.stanza;
	stanza:tag('identity', {category='pubsub', type='pep'}):up();
	stanza:tag('feature', {var='http://jabber.org/protocol/pubsub#publish'}):up();
end);

module:hook("account-disco-items", function(event)
	local session, stanza = event.session, event.stanza;
	local bare = session.username..'@'..session.host;
	local user_data = data[bare];

	if user_data then
		for node, _ in pairs(user_data) do
			stanza:tag('item', {jid=bare, node=node}):up(); -- TODO we need to handle queries to these nodes
		end
	end
end);