aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/mod_pubsub/mod_pubsub.lua
blob: cea4e6b21892f1581a7037906579d6fefa965feb (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
local pubsub = require "util.pubsub";
local st = require "util.stanza";
local jid_bare = require "util.jid".bare;
local usermanager = require "core.usermanager";
local new_id = require "util.id".medium;

local xmlns_pubsub = "http://jabber.org/protocol/pubsub";
local xmlns_pubsub_event = "http://jabber.org/protocol/pubsub#event";
local xmlns_pubsub_owner = "http://jabber.org/protocol/pubsub#owner";

local autocreate_on_publish = module:get_option_boolean("autocreate_on_publish", false);
local autocreate_on_subscribe = module:get_option_boolean("autocreate_on_subscribe", false);
local pubsub_disco_name = module:get_option_string("name", "Prosody PubSub Service");
local expose_publisher = module:get_option_boolean("expose_publisher", false)

local service;

local lib_pubsub = module:require "pubsub";

module:depends("disco");
module:add_identity("pubsub", "service", pubsub_disco_name);
module:add_feature("http://jabber.org/protocol/pubsub");

function handle_pubsub_iq(event)
	return lib_pubsub.handle_pubsub_iq(event, service);
end

-- An itemstore supports the following methods:
--   items(): iterator over (id, item)
--   get(id): return item with id
--   set(id, item): set id to item
--   clear(): clear all items
--   resize(n): set new limit and trim oldest items
--   tail(): return the latest item

-- A nodestore supports the following methods:
--   set(node_name, node_data)
--   get(node_name)
--   users(): iterator over (node_name)


local node_store = module:open_store(module.name.."_nodes");

local function create_simple_itemstore(node_config, node_name)
	local archive = module:open_store("pubsub_"..node_name, "archive");
	return lib_pubsub.archive_itemstore(archive, node_config, nil, node_name);
end

function simple_broadcast(kind, node, jids, item, actor, node_obj)
	if item then
		item = st.clone(item);
		item.attr.xmlns = nil; -- Clear the pubsub namespace
		if expose_publisher and actor then
			item.attr.publisher = actor
		end
	end

	local id = new_id();
	local msg_type = node_obj and node_obj.config.message_type or "headline";
	local message = st.message({ from = module.host, type = msg_type, id = id })
		:tag("event", { xmlns = xmlns_pubsub_event })
			:tag(kind, { node = node })

	if item then
		message:add_child(item);
	end

	local summary;
	-- Compose a sensible textual representation of at least Atom payloads
	if item and item.tags[1] then
		local payload = item.tags[1];
		summary = module:fire_event("pubsub-summary/"..payload.attr.xmlns, {
			kind = kind, node = node, jids = jids, actor = actor, item = item, payload = payload,
		});
	end

	for jid, options in pairs(jids) do
		local new_stanza = st.clone(message);
		if summary and type(options) == "table" and options["pubsub#include_body"] then
			new_stanza:body(summary);
		end
		new_stanza.attr.to = jid;
		module:send(new_stanza);
	end
end

local max_max_items = module:get_option_number("pubsub_max_items", 256);
function check_node_config(node, actor, new_config) -- luacheck: ignore 212/actor 212/node
	if (new_config["max_items"] or 1) > max_max_items then
		return false;
	end
	if new_config["access_model"] ~= "whitelist" and new_config["access_model"] ~= "open" then
		return false;
	end
	return true;
end

function is_item_stanza(item)
	return st.is_stanza(item) and item.attr.xmlns == xmlns_pubsub and item.name == "item";
end

module:hook("pubsub-summary/http://www.w3.org/2005/Atom", function (event)
	local payload = event.item;
	local title = payload:get_child_text("title");
	local summary = payload:get_child_text("summary");
	if not summary and title then
		local author = payload:find("author/name#");
		summary = title;
		if author then
			summary = author .. " posted " .. summary;
		end
	end
	return summary;
end);

module:hook("iq/host/"..xmlns_pubsub..":pubsub", handle_pubsub_iq);
module:hook("iq/host/"..xmlns_pubsub_owner..":pubsub", handle_pubsub_iq);

local function add_disco_features_from_service(service) --luacheck: ignore 431/service
	for feature in lib_pubsub.get_feature_set(service) do
		module:add_feature(xmlns_pubsub.."#"..feature);
	end
end

module:hook("host-disco-info-node", function (event)
	return lib_pubsub.handle_disco_info_node(event, service);
end);

module:hook("host-disco-items-node", function (event)
	return lib_pubsub.handle_disco_items_node(event, service);
end);


module:hook("host-disco-items", function (event)
	local stanza, reply = event.stanza, event.reply;
	local ok, ret = service:get_nodes(stanza.attr.from);
	if not ok then
		return;
	end
	for node, node_obj in pairs(ret) do
		reply:tag("item", { jid = module.host, node = node, name = node_obj.config.name }):up();
	end
end);

local admin_aff = module:get_option_string("default_admin_affiliation", "owner");
local function get_affiliation(jid)
	local bare_jid = jid_bare(jid);
	if bare_jid == module.host or usermanager.is_admin(bare_jid, module.host) then
		return admin_aff;
	end
end

function get_service()
	return service;
end

function set_service(new_service)
	service = new_service;
	module.environment.service = service;
	add_disco_features_from_service(service);
end

function module.save()
	return { service = service };
end

function module.restore(data)
	set_service(data.service);
end

function module.load()
	if module.reloading then return; end

	set_service(pubsub.new({
		autocreate_on_publish = autocreate_on_publish;
		autocreate_on_subscribe = autocreate_on_subscribe;

		nodestore = node_store;
		itemstore = create_simple_itemstore;
		broadcaster = simple_broadcast;
		itemcheck = is_item_stanza;
		check_node_config = check_node_config;
		get_affiliation = get_affiliation;

		normalize_jid = jid_bare;
	}));
end