+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];