-- 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 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.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 publish(session, node, item) item.attr.xmlns = nil; local disable = #item.tags ~= 1 or #item.tags[1].tags == 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] = 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' 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> session.send(st.reply(stanza)); publish(session, node, st.clone(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);