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local pubsub = require "util.pubsub";
local jid_bare = require "util.jid".bare;
local jid_split = require "util.jid".split;
local set_new = require "util.set".new;
local st = require "util.stanza";
local calculate_hash = require "util.caps".calculate_hash;
local is_contact_subscribed = require "core.rostermanager".is_contact_subscribed;
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 lib_pubsub = module:require "pubsub";
local handlers = lib_pubsub.handlers;
local pubsub_error_reply = lib_pubsub.pubsub_error_reply;
local empty_set = set_new();
local services = {};
local recipients = {};
local hash_map = {};
function module.save()
return { services = services };
end
function module.restore(data)
services = data.services;
end
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 get_broadcaster(name)
local 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 = name, 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 from %s: %s", jid, name, tostring(item));
message.attr.to = jid;
module:send(message);
end
end
return simple_broadcast;
end
function get_pep_service(name)
local service = services[name];
if service then
return service;
end
service = pubsub.new({
capabilities = {
none = {
create = false;
publish = false;
retract = false;
get_nodes = false;
subscribe = false;
unsubscribe = false;
get_subscription = false;
get_subscriptions = false;
get_items = false;
subscribe_other = false;
unsubscribe_other = false;
get_subscription_other = false;
get_subscriptions_other = false;
be_subscribed = true;
be_unsubscribed = true;
set_affiliation = false;
};
subscriber = {
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;
configure = 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;
};
};
node_defaults = {
["pubsub#max_items"] = "1";
};
autocreate_on_publish = true;
autocreate_on_subscribe = true;
broadcaster = get_broadcaster(name);
get_affiliation = function (jid)
if jid_bare(jid) == name then
return "owner";
elseif subscription_presence(name, jid) then
return "subscriber";
end
end;
normalize_jid = jid_bare;
});
services[name] = service;
module:add_item("pep-service", { service = service, jid = name });
return service;
end
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 service_name = stanza.attr.to or origin.username.."@"..origin.host
local service = get_pep_service(service_name);
local handler = handlers[stanza.attr.type.."_"..action.name];
if handler then
handler(origin, stanza, action, service);
return true;
end
end
module:hook("iq/bare/"..xmlns_pubsub..":pubsub", handle_pubsub_iq);
module:hook("iq/bare/"..xmlns_pubsub_owner..":pubsub", handle_pubsub_iq);
module:add_identity("pubsub", "pep", module:get_option_string("name", "Prosody"));
module:add_feature("http://jabber.org/protocol/pubsub#publish");
local function get_caps_hash_from_presence(stanza, current)
local t = stanza.attr.type;
if not t then
local child = stanza:get_child("c", "http://jabber.org/protocol/caps");
if child 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
end
return; -- no or bad caps
elseif t == "unavailable" or t == "error" then
return;
end
return current; -- no caps, could mean caps optimization, so return current
end
local function resend_last_item(jid, node, service)
local ok, items = service:get_items(node, jid);
if not ok then return; end
for i, id in ipairs(items) do
service.config.broadcaster("items", node, { [jid] = true }, items[id]);
end
end
local function update_subscriptions(recipient, service_name, nodes)
local service = get_pep_service(service_name);
nodes = nodes or empty_set;
local service_recipients = recipients[service_name];
if not service_recipients then
service_recipients = {};
recipients[service_name] = service_recipients;
end
local current = service_recipients[recipient];
if not current or type(current) ~= "table" then
current = empty_set;
end
if (current == empty_set or current:empty()) and (nodes == empty_set or nodes:empty()) then
return;
end
for node in current - nodes do
service:remove_subscription(node, recipient, recipient);
end
for node in nodes - current do
service:add_subscription(node, recipient, recipient);
resend_last_item(recipient, node, service);
end
if nodes == empty_set or nodes:empty() then
nodes = nil;
end
service_recipients[recipient] = nodes;
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);
local t = stanza.attr.type;
local self = not stanza.attr.to;
local service = get_pep_service(user);
if not t then -- available presence
if self or subscription_presence(user, stanza.attr.from) then
local recipient = stanza.attr.from;
local current = recipients[user] and recipients[user][recipient];
local hash, query_node = get_caps_hash_from_presence(stanza, current);
if current == hash or (current and current == hash_map[hash]) then return; end
if not hash then
update_subscriptions(recipient, user);
else
recipients[user] = recipients[user] or {};
if hash_map[hash] then
update_subscriptions(recipient, user, hash_map[hash]);
else
recipients[user][recipient] = hash;
local from_bare = origin.type == "c2s" and origin.username.."@"..origin.host;
if self or origin.type ~= "c2s" or (recipients[from_bare] and recipients[from_bare][origin.full_jid]) ~= hash then
-- COMPAT from ~= stanza.attr.to because OneTeam can't deal with missing from attribute
origin.send(
st.stanza("iq", {from=user, to=stanza.attr.from, id="disco", type="get"})
:tag("query", {xmlns = "http://jabber.org/protocol/disco#info", node = query_node})
);
end
end
end
end
elseif t == "unavailable" then
update_subscriptions(stanza.attr.from, user);
elseif not self and t == "unsubscribe" then
local from = jid_bare(stanza.attr.from);
local subscriptions = recipients[user];
if subscriptions then
for subscriber in pairs(subscriptions) do
if jid_bare(subscriber) == from then
update_subscriptions(subscriber, user);
end
end
end
end
end, 10);
module:hook("iq-result/bare/disco", function(event)
local origin, stanza = event.origin, event.stanza;
local disco = stanza:get_child("query", "http://jabber.org/protocol/disco#info");
if not disco then
return;
end
-- Process disco response
local self = not stanza.attr.to;
local user = stanza.attr.to or (origin.username..'@'..origin.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 = set_new();
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:add(nfeature); end
end
end
hash_map[ver] = notify; -- update hash map
if self then
for jid, item in pairs(origin.roster) do -- for all interested contacts
if item.subscription == "both" or item.subscription == "from" then
if not recipients[jid] then recipients[jid] = {}; end
update_subscriptions(contact, jid, notify);
end
end
end
update_subscriptions(contact, user, notify);
end);
module:hook("account-disco-info-node", function(event)
local reply, stanza, origin = event.reply, event.stanza, event.origin;
local service_name = stanza.attr.to or origin.username.."@"..origin.host
local service = get_pep_service(service_name);
local node = event.node;
local ok = service:get_items(node, jid_bare(stanza.attr.from) or true);
if not ok then return; end
event.exists = true;
reply:tag('identity', {category='pubsub', type='leaf'}):up();
end);
module:hook("account-disco-info", function(event)
local reply = event.reply;
reply:tag('identity', {category='pubsub', type='pep'}):up();
reply:tag('feature', {var='http://jabber.org/protocol/pubsub#publish'}):up();
end);
module:hook("account-disco-items-node", function(event)
local reply, stanza, origin = event.reply, event.stanza, event.origin;
local node = event.node;
local service_name = stanza.attr.to or origin.username.."@"..origin.host
local service = get_pep_service(service_name);
local ok, ret = service:get_items(node, jid_bare(stanza.attr.from) or true);
if not ok then return; end
event.exists = true;
for _, id in ipairs(ret) do
reply:tag("item", { jid = service_name, name = id }):up();
end
end);
module:hook("account-disco-items", function(event)
local reply, stanza, origin = event.reply, event.stanza, event.origin;
local service_name = reply.attr.from or origin.username.."@"..origin.host
local service = get_pep_service(service_name);
local ok, ret = service:get_nodes(jid_bare(stanza.attr.from));
if not ok then return; end
for node, node_obj in pairs(ret) do
reply:tag("item", { jid = service_name, node = node, name = node_obj.config.name }):up();
end
end);
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