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-- 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 jid_bare = require "util.jid".bare;
local jid_split = require "util.jid".split;
local st = require "util.stanza";
local hosts = hosts;
local user_exists = require "core.usermanager".user_exists;
local is_contact_subscribed = require "core.rostermanager".is_contact_subscribed;
local pairs, ipairs = pairs, ipairs;
local next = next;
local type = type;
local calculate_hash = require "util.caps".calculate_hash;
local NULL = {};
local data = {};
local recipients = {};
local hash_map = {};
module.save = function()
return { data = data, recipients = recipients, hash_map = hash_map };
end
module.restore = function(state)
data = state.data or {};
recipients = state.recipients or {};
hash_map = state.hash_map or {};
end
module:add_identity("pubsub", "pep", "Prosody");
module:add_feature("http://jabber.org/protocol/pubsub#publish");
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 publish(session, node, id, item)
item.attr.xmlns = nil;
local disable = #item.tags ~= 1 or #item.tags[1] == 0;
if #item.tags == 0 then item.name = "retract"; end
local bare = session.username..'@'..session.host;
local stanza = st.message({from=bare, type='headline'})
:tag('event', {xmlns='http://jabber.org/protocol/pubsub#event'})
:tag('items', {node=node})
:add_child(item)
:up()
:up();
-- store for the future
local user_data = data[bare];
if disable then
if user_data then
user_data[node] = nil;
if not next(user_data) then data[bare] = nil; end
end
else
if not user_data then user_data = {}; data[bare] = user_data; end
user_data[node] = {id or "1", item};
end
-- broadcast
for recipient, notify in pairs(recipients[bare] or NULL) do
if notify[node] then
stanza.attr.to = recipient;
core_post_stanza(session, stanza);
end
end
end
local function publish_all(user, recipient, session)
local d = data[user];
local notify = recipients[user] and recipients[user][recipient];
if d and notify then
for node in pairs(notify) do
if d[node] then
local id, item = unpack(d[node]);
session.send(st.message({from=user, to=recipient, type='headline'})
:tag('event', {xmlns='http://jabber.org/protocol/pubsub#event'})
:tag('items', {node=node})
:add_child(item)
:up()
:up());
end
end
end
end
local function get_caps_hash_from_presence(stanza, current)
local t = stanza.attr.type;
if not t then
for _, child in pairs(stanza.tags) do
if child.name == "c" and child.attr.xmlns == "http://jabber.org/protocol/caps" 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
return; -- bad caps format
end
end
elseif t == "unavailable" or t == "error" then
return;
end
return current; -- no caps, could mean caps optimization, so return current
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;
if not t then -- available presence
if not stanza.attr.to or subscription_presence(user, stanza.attr.from) then
local recipient = stanza.attr.from;
local current = recipients[user] and recipients[user][recipient];
local hash = get_caps_hash_from_presence(stanza, current);
if current == hash then return; end
if not hash then
if recipients[user] then recipients[user][recipient] = nil; end
else
recipients[user] = recipients[user] or {};
if hash_map[hash] then
recipients[user][recipient] = hash_map[hash];
publish_all(user, recipient, origin);
else
recipients[user][recipient] = hash;
origin.send(
st.stanza("iq", {from=stanza.attr.to, to=stanza.attr.from, id="disco", type="get"})
:query("http://jabber.org/protocol/disco#info")
);
end
end
end
elseif t == "unavailable" then
if recipients[user] then recipients[user][stanza.attr.from] = nil; end
end
end, 10);
module:hook("iq/bare/http://jabber.org/protocol/pubsub:pubsub", function(event)
local session, stanza = event.origin, event.stanza;
local payload = stanza.tags[1];
if stanza.attr.type == 'set' and (not stanza.attr.to or jid_bare(stanza.attr.from) == stanza.attr.to) then
payload = payload.tags[1];
if payload and (payload.name == 'publish' or payload.name == 'retract') and payload.attr.node then -- <publish node='http://jabber.org/protocol/tune'>
local node = payload.attr.node;
payload = payload.tags[1];
if payload and payload.name == "item" then -- <item>
local id = payload.attr.id;
session.send(st.reply(stanza));
publish(session, node, id, st.clone(payload));
return true;
end
end
elseif stanza.attr.type == 'get' then
local user = stanza.attr.to and jid_bare(stanza.attr.to) or session.username..'@'..session.host;
if subscription_presence(user, stanza.attr.from) then
local user_data = data[user];
local node, requested_id;
payload = payload.tags[1];
if payload and payload.name == 'items' then
node = payload.attr.node;
local item = payload.tags[1];
if item and item.name == "item" then
requested_id = item.attr.id;
end
end
if node and user_data and user_data[node] then -- Send the last item
local id, item = unpack(user_data[node]);
if not requested_id or id == requested_id then
local stanza = st.reply(stanza)
:tag('pubsub', {xmlns='http://jabber.org/protocol/pubsub'})
:tag('items', {node=node})
:add_child(item)
:up()
:up();
session.send(stanza);
return true;
else -- requested item doesn't exist
local stanza = st.reply(stanza)
:tag('pubsub', {xmlns='http://jabber.org/protocol/pubsub'})
:tag('items', {node=node})
:up();
session.send(stanza);
return true;
end
elseif node then -- node doesn't exist
session.send(st.error_reply(stanza, 'cancel', 'item-not-found'));
return true;
else --invalid request
session.send(st.error_reply(stanza, 'modify', 'bad-request'));
return true;
end
else --no presence subscription
session.send(st.error_reply(stanza, 'auth', 'not-authorized')
:tag('presence-subscription-required', {xmlns='http://jabber.org/protocol/pubsub#errors'}));
return true;
end
end
end);
module:hook("iq-result/bare/disco", function(event)
local session, stanza = event.origin, event.stanza;
if stanza.attr.type == "result" then
local disco = stanza.tags[1];
if disco and disco.name == "query" and disco.attr.xmlns == "http://jabber.org/protocol/disco#info" then
-- Process disco response
local user = stanza.attr.to or (session.username..'@'..session.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 = {};
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[nfeature] = true; end
end
end
hash_map[ver] = notify; -- update hash map
recipients[user][contact] = notify; -- set recipient's data to calculated data
-- send messages to recipient
publish_all(user, contact, session);
end
end
end);
module:hook("account-disco-info", function(event)
local stanza = event.stanza;
stanza:tag('identity', {category='pubsub', type='pep'}):up();
stanza:tag('feature', {var='http://jabber.org/protocol/pubsub#publish'}):up();
end);
module:hook("account-disco-items", function(event)
local stanza = event.stanza;
local bare = stanza.attr.to;
local user_data = data[bare];
if user_data then
for node, _ in pairs(user_data) do
stanza:tag('item', {jid=bare, node=node}):up(); -- TODO we need to handle queries to these nodes
end
end
end);
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