aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/mod_disco.lua
blob: b41f96519df57d47480e6abd1eef185f9e351e68 (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
-- 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("disco_items") or {};
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

module:add_identity("server", "im", module:get_option_string("name", "Prosody")); -- FIXME should be in the non-existing mod_router
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/host/http://jabber.org/protocol/disco#info:query", function(event)
	local origin, stanza = event.origin, event.stanza;
	if stanza.attr.type ~= "get" then return; end
	local node = stanza.tags[1].attr.node;
	if node and node ~= "" and node ~= "http://prosody.im#"..get_server_caps_hash() then return; end -- TODO fire event?
	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/host/http://jabber.org/protocol/disco#items:query", function(event)
	local origin, stanza = event.origin, event.stanza;
	if stanza.attr.type ~= "get" then return; end
	local node = stanza.tags[1].attr.node;
	if node and node ~= "" then return; end -- TODO fire event?

	local reply = st.reply(stanza):query("http://jabber.org/protocol/disco#items");
	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" then
		event.features:add_child(get_server_caps_feature());
	end
end);

-- Handle disco requests to user accounts
module:hook("iq/bare/http://jabber.org/protocol/disco#info:query", function(event)
	local origin, stanza = event.origin, event.stanza;
	if stanza.attr.type ~= "get" then return; end
	local node = stanza.tags[1].attr.node;
	if node and node ~= "" then return; end -- TODO fire event?
	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
		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
		module:fire_event("account-disco-info", { origin = origin, stanza = reply });
		origin.send(reply);
		return true;
	end
end);
module:hook("iq/bare/http://jabber.org/protocol/disco#items:query", function(event)
	local origin, stanza = event.origin, event.stanza;
	if stanza.attr.type ~= "get" then return; end
	local node = stanza.tags[1].attr.node;
	if node and node ~= "" then return; end -- TODO fire event?
	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
		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 = reply });
		origin.send(reply);
		return true;
	end
end);