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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 load_roster = require "core.rostermanager".load_roster;
local sha1 = require "util.hashes".sha1;
local base64 = require "util.encodings".base64.encode;
local NULL = {};
local data = {};
local recipients = {};
local hash_map = {};
module:add_identity("pubsub", "pep");
module:add_feature("http://jabber.org/protocol/pubsub#publish");
local function publish(session, node, item)
local disable = #item.tags ~= 1 or #item.tags[1].tags == 0;
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] = stanza;
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
local message = d[node];
if message then
message.attr.to = recipient;
session.send(message);
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 bare = jid_bare(stanza.attr.from);
local item = load_roster(jid_split(user))[bare];
if not stanza.attr.to or (item and (item.subscription == 'from' or item.subscription == 'both')) 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
end, 10);
module:hook("iq/bare/http://jabber.org/protocol/pubsub:pubsub", function(event)
local session, stanza = event.origin, event.stanza;
if stanza.attr.type == 'set' and (not stanza.attr.to or jid_bare(stanza.attr.from) == stanza.attr.to) then
local payload = stanza.tags[1];
if payload.name == 'pubsub' then -- <pubsub xmlns='http://jabber.org/protocol/pubsub'>
payload = payload.tags[1];
if payload and payload.name == 'publish' and payload.attr.node then -- <publish node='http://jabber.org/protocol/tune'>
local node = payload.attr.node;
payload = payload.tags[1];
if payload then -- <item>
publish(session, node, payload);
return true;
end
end
end
end
end);
local function calculate_hash(disco_info)
local identities, features, extensions = {}, {}, {};
for _, tag in pairs(disco_info) do
if tag.name == "identity" then
table.insert(identities, (tag.attr.category or "").."\0"..(tag.attr.type or "").."\0"..(tag.attr["xml:lang"] or "").."\0"..(tag.attr.name or ""));
elseif tag.name == "feature" then
table.insert(features, tag.attr.var or "");
elseif tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then
local form = {};
local FORM_TYPE;
for _, field in pairs(tag.tags) do
if field.name == "field" and field.attr.var then
local values = {};
for _, val in pairs(field.tags) do
val = #val.tags == 0 and table.concat(val); -- FIXME use get_text?
if val then table.insert(values, val); end
end
table.sort(values);
if field.attr.var == "FORM_TYPE" then
FORM_TYPE = values[1];
elseif #values > 0 then
table.insert(form, field.attr.var.."\0"..table.concat(values, "<"));
else
table.insert(form, field.attr.var);
end
end
end
table.sort(form);
form = table.concat(form, "<");
if FORM_TYPE then form = FORM_TYPE.."\0"..form; end
table.insert(extensions, form);
end
end
table.sort(identities);
table.sort(features);
table.sort(extensions);
if #identities > 0 then identities = table.concat(identities, "<"):gsub("%z", "/").."<"; else identities = ""; end
if #features > 0 then features = table.concat(features, "<").."<"; else features = ""; end
if #extensions > 0 then extensions = table.concat(extensions, "<"):gsub("%z", "<").."<"; else extensions = ""; end
local S = identities..features..extensions;
local ver = base64(sha1(S));
return ver, S;
end
module:hook("iq/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);
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