path: root/plugins/mod_pubsub/mod_pubsub.lua

local pubsub = require "util.pubsub";
local st = require "util.stanza";
local jid_bare = require "util.jid".bare;
local usermanager = require "core.usermanager";

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("name");
if type(pubsub_disco_name) ~= "string" then pubsub_disco_name = "Prosody PubSub Service"; end

local service;

local lib_pubsub = module:require "pubsub";
local handlers = lib_pubsub.handlers;
local pubsub_error_reply = lib_pubsub.pubsub_error_reply;

function handle_pubsub_iq(event)
	local origin, stanza = event.origin, event.stanza;
	local pubsub = stanza.tags[1];
	local action = pubsub.tags[1];
	if not action then
		return origin.send(st.error_reply(stanza, "cancel", "bad-request"));
	end
	local handler = handlers[stanza.attr.type.."_"..action.name];
	if handler then
		handler(origin, stanza, action, service);
		return true;
	end
end

function simple_broadcast(kind, node, jids, item)
	if item then
		item = st.clone(item);
		item.attr.xmlns = nil; -- Clear the pubsub namespace
	end
	local message = st.message({ from = module.host, type = "headline" })
		:tag("event", { xmlns = xmlns_pubsub_event })
			:tag(kind, { node = node })
				:add_child(item);
	for jid in pairs(jids) do
		module:log("debug", "Sending notification to %s", jid);
		message.attr.to = jid;
		module:send(message);
	end
end

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

local disco_info;

local feature_map = {
	create = { "create-nodes", "instant-nodes", "item-ids" };
	retract = { "delete-items", "retract-items" };
	purge = { "purge-nodes" };
	publish = { "publish", autocreate_on_publish and "auto-create" };
	delete = { "delete-nodes" };
	get_items = { "retrieve-items" };
	add_subscription = { "subscribe" };
	get_subscriptions = { "retrieve-subscriptions" };
};

local function add_disco_features_from_service(disco, service)
	for method, features in pairs(feature_map) do
		if service[method] then
			for _, feature in ipairs(features) do
				if feature then
					disco:tag("feature", { var = xmlns_pubsub.."#"..feature }):up();
				end
			end
		end
	end
	for affiliation in pairs(service.config.capabilities) do
		if affiliation ~= "none" and affiliation ~= "owner" then
			disco:tag("feature", { var = xmlns_pubsub.."#"..affiliation.."-affiliation" }):up();
		end
	end
end

local function build_disco_info(service)
	local disco_info = st.stanza("query", { xmlns = "http://jabber.org/protocol/disco#info" })
		:tag("identity", { category = "pubsub", type = "service", name = pubsub_disco_name }):up()
		:tag("feature", { var = "http://jabber.org/protocol/pubsub" }):up();
	add_disco_features_from_service(disco_info, service);
	return disco_info;
end

module:hook("iq-get/host/http://jabber.org/protocol/disco#info:query", function (event)
	local origin, stanza = event.origin, event.stanza;
	local node = stanza.tags[1].attr.node;
	if not node then
		return origin.send(st.reply(stanza):add_child(disco_info));
	else
		local ok, ret = service:get_nodes(stanza.attr.from);
		if ok and not ret[node] then
			ok, ret = false, "item-not-found";
		end
		if not ok then
			return origin.send(pubsub_error_reply(stanza, ret));
		end
		local reply = st.reply(stanza)
			:tag("query", { xmlns = "http://jabber.org/protocol/disco#info", node = node })
				:tag("identity", { category = "pubsub", type = "leaf" });
		return origin.send(reply);
	end
end);

local function handle_disco_items_on_node(event)
	local stanza, origin = event.stanza, event.origin;
	local query = stanza.tags[1];
	local node = query.attr.node;
	local ok, ret = service:get_items(node, stanza.attr.from);
	if not ok then
		return origin.send(pubsub_error_reply(stanza, ret));
	end

	local reply = st.reply(stanza)
		:tag("query", { xmlns = "http://jabber.org/protocol/disco#items", node = node });

	for id, item in pairs(ret) do
		reply:tag("item", { jid = module.host, name = id }):up();
	end

	return origin.send(reply);
end


module:hook("iq-get/host/http://jabber.org/protocol/disco#items:query", function (event)
	if event.stanza.tags[1].attr.node then
		return handle_disco_items_on_node(event);
	end
	local ok, ret = service:get_nodes(event.stanza.attr.from);
	if not ok then
		event.origin.send(pubsub_error_reply(event.stanza, ret));
	else
		local reply = st.reply(event.stanza)
			:tag("query", { xmlns = "http://jabber.org/protocol/disco#items" });
		for node, node_obj in pairs(ret) do
			reply:tag("item", { jid = module.host, node = node, name = node_obj.config.name }):up();
		end
		event.origin.send(reply);
	end
	return true;
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 set_service(new_service)
	service = new_service;
	module.environment.service = service;
	disco_info = build_disco_info(service);
end

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

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

set_service(pubsub.new({
	capabilities = {
		none = {
			create = false;
			publish = false;
			retract = false;
			get_nodes = true;

			subscribe = true;
			unsubscribe = true;
			get_subscription = true;
			get_subscriptions = true;
			get_items = true;

			subscribe_other = false;
			unsubscribe_other = false;
			get_subscription_other = false;
			get_subscriptions_other = false;

			be_subscribed = true;
			be_unsubscribed = true;

			set_affiliation = false;
		};
		publisher = {
			create = false;
			publish = true;
			retract = true;
			get_nodes = true;

			subscribe = true;
			unsubscribe = true;
			get_subscription = true;
			get_subscriptions = true;
			get_items = true;

			subscribe_other = false;
			unsubscribe_other = false;
			get_subscription_other = false;
			get_subscriptions_other = false;

			be_subscribed = true;
			be_unsubscribed = true;

			set_affiliation = false;
		};
		owner = {
			create = true;
			publish = true;
			retract = true;
			delete = true;
			get_nodes = true;

			subscribe = true;
			unsubscribe = true;
			get_subscription = true;
			get_subscriptions = true;
			get_items = true;


			subscribe_other = true;
			unsubscribe_other = true;
			get_subscription_other = true;
			get_subscriptions_other = true;

			be_subscribed = true;
			be_unsubscribed = true;

			set_affiliation = true;
		};
	};

	autocreate_on_publish = autocreate_on_publish;
	autocreate_on_subscribe = autocreate_on_subscribe;

	broadcaster = simple_broadcast;
	get_affiliation = get_affiliation;

	normalize_jid = jid_bare;
}));