+-- Prosody IM
+-- Copyright (C) 2008-2009 Matthew Wild
+-- Copyright (C) 2008-2009 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 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.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 item = load_roster(jid_split(user_bare))[recipient_bare];
+ return item and (item.subscription == 'from' or item.subscription == 'both');
+end
-local function publish(session, node, item)
- local stanza = st.message({from=session.full_jid, type='headline'})
+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();
- local bare = session.username..'@'..session.host;
-- store for the future
local user_data = data[bare];
- if not user_data then user_data = {}; data[bare] = user_data; end
- user_data[node] = stanza;
-
- -- broadcast to resources
- stanza.attr.to = bare;
- core_route_stanza(session, stanza);
-
- -- broadcast to contacts
- for jid, item in pairs(session.roster) do
- if jid and jid ~= "pending" and (item.subscription == 'from' or item.subscription == 'both') then
- stanza.attr.to = jid;
- core_route_stanza(session, stanza);
+ 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
-module:hook("presence/bare", function(data)
+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 = data.origin, data.stanza;
-
+ 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 t = stanza.attr.type;
+
+ if not stanza.attr.to or subscription_presence(user, stanza.attr.from) then
local recipient = stanza.attr.from;
- if t == "unavailable" or t == "error" then
+ 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
- elseif not t then
+ else
recipients[user] = recipients[user] or {};
- if not recipients[user][recipient] then
- recipients[user][recipient] = true;
- for node, message in pairs(data[user] or {}) do
- message.attr.to = stanza.attr.from;
- origin.send(message);
- end
+ 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:add_iq_handler("c2s", "http://jabber.org/protocol/pubsub", function (session, stanza)
+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
- local payload = stanza.tags[1];
- if payload.name == 'pubsub' 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 == 'publish' and payload.attr.node then
- local node = payload.attr.node;
- payload = payload.tags[1];
- if payload then
- publish(session, node, payload);
+ 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 -- TODO else error
- end -- TODO else error
+ 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
- session.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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);
+
+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 session, stanza = event.session, event.stanza;
+ local bare = session.username..'@'..session.host;
+ 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);