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local pubsub = require "util.pubsub";
local st = require "util.stanza";
local jid_bare = require "util.jid".bare;
local uuid_generate = require "util.uuid".generate;
require "core.modulemanager".load(module.host, "iq");
local xmlns_pubsub = "http://jabber.org/protocol/pubsub";
local xmlns_pubsub_errors = "http://jabber.org/protocol/pubsub#errors";
local xmlns_pubsub_event = "http://jabber.org/protocol/pubsub#event";
local service;
local handlers = {};
function handle_pubsub_iq(event)
local origin, stanza = event.origin, event.stanza;
local pubsub = stanza.tags[1];
local action = pubsub.tags[1];
local handler = handlers[stanza.attr.type.."_"..action.name];
if handler then
handler(origin, stanza, action);
return true;
end
end
local pubsub_errors = {
["conflict"] = { "cancel", "conflict" };
["invalid-jid"] = { "modify", "bad-request", nil, "invalid-jid" };
["item-not-found"] = { "cancel", "item-not-found" };
["not-subscribed"] = { "modify", "unexpected-request", nil, "not-subscribed" };
["forbidden"] = { "cancel", "forbidden" };
};
function pubsub_error_reply(stanza, error)
local e = pubsub_errors[error];
local reply = st.error_reply(stanza, unpack(e, 1, 3));
if e[4] then
reply:tag(e[4], { xmlns = xmlns_pubsub_errors }):up();
end
return reply;
end
function handlers.get_items(origin, stanza, items)
local node = items.attr.node;
local item = items:get_child("item");
local id = item and item.attr.id;
local data = st.stanza("items", { node = node });
for _, entry in pairs(service:get(node, stanza.attr.from, id)) do
data:add_child(entry);
end
if data then
reply = st.reply(stanza)
:tag("pubsub", { xmlns = xmlns_pubsub })
:add_child(data);
else
reply = pubsub_error_reply(stanza, "item-not-found");
end
return origin.send(reply);
end
function handlers.set_create(origin, stanza, create)
local node = create.attr.node;
local ok, ret, reply;
if node then
ok, ret = service:create(node, stanza.attr.from);
if ok then
reply = st.reply(stanza);
else
reply = pubsub_error_reply(stanza, ret);
end
else
repeat
node = uuid_generate();
ok, ret = service:create(node, stanza.attr.from);
until ok;
reply = st.reply(stanza)
:tag("pubsub", { xmlns = xmlns_pubsub })
:tag("create", { node = node });
end
return origin.send(reply);
end
function handlers.set_subscribe(origin, stanza, subscribe)
local node, jid = subscribe.attr.node, subscribe.attr.jid;
if jid_bare(jid) ~= jid_bare(stanza.attr.from) then
return origin.send(pubsub_error_reply(stanza, "invalid-jid"));
end
local ok, ret = service:add_subscription(node, stanza.attr.from, jid);
local reply;
if ok then
reply = st.reply(stanza)
:tag("pubsub", { xmlns = xmlns_pubsub })
:tag("subscription", {
node = node,
jid = jid,
subscription = "subscribed"
});
else
reply = pubsub_error_reply(stanza, ret);
end
return origin.send(reply);
end
function handlers.set_unsubscribe(origin, stanza, unsubscribe)
local node, jid = unsubscribe.attr.node, unsubscribe.attr.jid;
if jid_bare(jid) ~= jid_bare(stanza.attr.from) then
return origin.send(pubsub_error_reply(stanza, "invalid-jid"));
end
local ok, ret = service:remove_subscription(node, stanza.attr.from, jid);
local reply;
if ok then
reply = st.reply(stanza);
else
reply = pubsub_error_reply(stanza, ret);
end
return origin.send(reply);
end
function handlers.set_publish(origin, stanza, publish)
local node = publish.attr.node;
local item = publish:get_child("item");
local id = (item and item.attr.id) or uuid_generate();
local ok, ret = service:publish(node, stanza.attr.from, id, item);
local reply;
if ok then
reply = st.reply(stanza)
:tag("pubsub", { xmlns = xmlns_pubsub })
:tag("publish", { node = node })
:tag("item", { id = id });
else
reply = pubsub_error_reply(stanza, ret);
end
return origin.send(reply);
end
function handlers.set_retract(origin, stanza, retract)
local node, notify = retract.attr.node, retract.attr.notify;
notify = (notify == "1") or (notify == "true");
local item = retract:get_child("item");
local id = item and item.attr.id
local reply, notifier;
if notify then
notifier = st.stanza("retract", { id = id });
end
local ok, ret = service:retract(node, stanza.attr.from, id, notifier);
if ok then
reply = st.reply(stanza);
else
reply = pubsub_error_reply(stanza, ret);
end
return origin.send(reply);
end
function simple_broadcast(node, jids, item)
item = st.clone(item);
item.attr.xmlns = nil; -- Clear the pubsub namespace
local message = st.message({ from = module.host, type = "headline" })
:tag("event", { xmlns = xmlns_pubsub_event })
:tag("items", { node = node })
:add_child(item);
for jid in pairs(jids) do
module:log("debug", "Sending notification to %s", jid);
message.attr.to = jid;
core_post_stanza(hosts[module.host], message);
end
end
module:hook("iq/host/http://jabber.org/protocol/pubsub:pubsub", handle_pubsub_iq);
local disco_info = st.stanza("query", { xmlns = "http://jabber.org/protocol/disco#info" })
:tag("identity", { category = "pubsub", type = "service" }):up()
:tag("feature", { var = "http://jabber.org/protocol/pubsub" }):up();
module:hook("iq-get/host/http://jabber.org/protocol/disco#info:query", function (event)
event.origin.send(st.reply(event.stanza):add_child(disco_info));
return true;
end);
module:hook("iq-get/host/http://jabber.org/protocol/disco#items:query", function (event)
local ok, ret = service:get_nodes(event.stanza.attr.from);
if not ok then
event.origin.send(pubsub_error_reply(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);
service = pubsub.new({
broadcaster = simple_broadcast
});
module.environment.service = service;
function module.save()
return { service = service };
end
function module.restore(data)
service = data.service;
module.environment.service = service;
end
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