plugins/mod_pep.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9
  10 local jid_bare = require "util.jid".bare;
  11 local jid_split = require "util.jid".split;
  12 local st = require "util.stanza";
  13 local hosts = hosts;
  14 local user_exists = require "core.usermanager".user_exists;
  15 local is_contact_subscribed = require "core.rostermanager".is_contact_subscribed;
  16 local pairs, ipairs = pairs, ipairs;
  17 local next = next;
  18 local type = type;
  19 local calculate_hash = require "util.caps".calculate_hash;
  20
  21 local NULL = {};
  22 local data = {};
  23 local recipients = {};
  24 local hash_map = {};
  25
  26 module.save = function()
  27         return { data = data, recipients = recipients, hash_map = hash_map };
  28 end
  29 module.restore = function(state)
  30         data = state.data or {};
  31         recipients = state.recipients or {};
  32         hash_map = state.hash_map or {};
  33 end
  34
  35 module:add_identity("pubsub", "pep", "Prosody");
  36 module:add_feature("http://jabber.org/protocol/pubsub#publish");
  37
  38 local function subscription_presence(user_bare, recipient)
  39         local recipient_bare = jid_bare(recipient);
  40         if (recipient_bare == user_bare) then return true end
  41         local username, host = jid_split(user_bare);
  42         return is_contact_subscribed(username, host, recipient_bare);
  43 end
  44
  45 local function publish(session, node, id, item)
  46         item.attr.xmlns = nil;
  47         local disable = #item.tags ~= 1 or #item.tags[1] == 0;
  48         if #item.tags == 0 then item.name = "retract"; end
  49         local bare = session.username..'@'..session.host;
  50         local stanza = st.message({from=bare, type='headline'})
  51                 :tag('event', {xmlns='http://jabber.org/protocol/pubsub#event'})
  52                         :tag('items', {node=node})
  53                                 :add_child(item)
  54                         :up()
  55                 :up();
  56
  57         -- store for the future
  58         local user_data = data[bare];
  59         if disable then
  60                 if user_data then
  61                         user_data[node] = nil;
  62                         if not next(user_data) then data[bare] = nil; end
  63                 end
  64         else
  65                 if not user_data then user_data = {}; data[bare] = user_data; end
  66                 user_data[node] = {id or "1", item};
  67         end
  68
  69         -- broadcast
  70         for recipient, notify in pairs(recipients[bare] or NULL) do
  71                 if notify[node] then
  72                         stanza.attr.to = recipient;
  73                         core_post_stanza(session, stanza);
  74                 end
  75         end
  76 end
  77 local function publish_all(user, recipient, session)
  78         local d = data[user];
  79         local notify = recipients[user] and recipients[user][recipient];
  80         if d and notify then
  81                 for node in pairs(notify) do
  82                         if d[node] then
  83                                 local id, item = unpack(d[node]);
  84                                 session.send(st.message({from=user, to=recipient, type='headline'})
  85                                         :tag('event', {xmlns='http://jabber.org/protocol/pubsub#event'})
  86                                                 :tag('items', {node=node})
  87                                                         :add_child(item)
  88                                                 :up()
  89                                         :up());
  90                         end
  91                 end
  92         end
  93 end
  94
  95 local function get_caps_hash_from_presence(stanza, current)
  96         local t = stanza.attr.type;
  97         if not t then
  98                 for _, child in pairs(stanza.tags) do
  99                         if child.name == "c" and child.attr.xmlns == "http://jabber.org/protocol/caps" then
 100                                 local attr = child.attr;
 101                                 if attr.hash then -- new caps
 102                                         if attr.hash == 'sha-1' and attr.node and attr.ver then return attr.ver, attr.node.."#"..attr.ver; end
 103                                 else -- legacy caps
 104                                         if attr.node and attr.ver then return attr.node.."#"..attr.ver.."#"..(attr.ext or ""), attr.node.."#"..attr.ver; end
 105                                 end
 106                                 return; -- bad caps format
 107                         end
 108                 end
 109         elseif t == "unavailable" or t == "error" then
 110                 return;
 111         end
 112         return current; -- no caps, could mean caps optimization, so return current
 113 end
 114
 115 module:hook("presence/bare", function(event)
 116         -- inbound presence to bare JID recieved
 117         local origin, stanza = event.origin, event.stanza;
 118         local user = stanza.attr.to or (origin.username..'@'..origin.host);
 119         local t = stanza.attr.type;
 120
 121         if not t then -- available presence
 122                 if not stanza.attr.to or subscription_presence(user, stanza.attr.from) then
 123                         local recipient = stanza.attr.from;
 124                         local current = recipients[user] and recipients[user][recipient];
 125                         local hash = get_caps_hash_from_presence(stanza, current);
 126                         if current == hash then return; end
 127                         if not hash then
 128                                 if recipients[user] then recipients[user][recipient] = nil; end
 129                         else
 130                                 recipients[user] = recipients[user] or {};
 131                                 if hash_map[hash] then
 132                                         recipients[user][recipient] = hash_map[hash];
 133                                         publish_all(user, recipient, origin);
 134                                 else
 135                                         recipients[user][recipient] = hash;
 136                                         origin.send(
 137                                                 st.stanza("iq", {from=stanza.attr.to, to=stanza.attr.from, id="disco", type="get"})
 138                                                         :query("http://jabber.org/protocol/disco#info")
 139                                         );
 140                                 end
 141                         end
 142                 end
 143         elseif t == "unavailable" then
 144                 if recipients[user] then recipients[user][stanza.attr.from] = nil; end
 145         end
 146 end, 10);
 147
 148 module:hook("iq/bare/http://jabber.org/protocol/pubsub:pubsub", function(event)
 149         local session, stanza = event.origin, event.stanza;
 150         local payload = stanza.tags[1];
 151
 152         if stanza.attr.type == 'set' and (not stanza.attr.to or jid_bare(stanza.attr.from) == stanza.attr.to) then
 153                 payload = payload.tags[1];
 154                 if payload and (payload.name == 'publish' or payload.name == 'retract') and payload.attr.node then -- <publish node='http://jabber.org/protocol/tune'>
 155                         local node = payload.attr.node;
 156                         payload = payload.tags[1];
 157                         if payload and payload.name == "item" then -- <item>
 158                                 local id = payload.attr.id;
 159                                 session.send(st.reply(stanza));
 160                                 publish(session, node, id, st.clone(payload));
 161                                 return true;
 162                         end
 163                 end
 164         elseif stanza.attr.type == 'get' then
 165                 local user = stanza.attr.to and jid_bare(stanza.attr.to) or session.username..'@'..session.host;
 166                 if subscription_presence(user, stanza.attr.from) then
 167                         local user_data = data[user];
 168                         local node, requested_id;
 169                         payload = payload.tags[1];
 170                         if payload and payload.name == 'items' then
 171                                 node = payload.attr.node;
 172                                 local item = payload.tags[1];
 173                                 if item and item.name == "item" then
 174                                         requested_id = item.attr.id;
 175                                 end
 176                         end
 177                         if node and user_data and user_data[node] then -- Send the last item
 178                                 local id, item = unpack(user_data[node]);
 179                                 if not requested_id or id == requested_id then
 180                                         local stanza = st.reply(stanza)
 181                                                 :tag('pubsub', {xmlns='http://jabber.org/protocol/pubsub'})
 182                                                         :tag('items', {node=node})
 183                                                                 :add_child(item)
 184                                                         :up()
 185                                                 :up();
 186                                         session.send(stanza);
 187                                         return true;
 188                                 else -- requested item doesn't exist
 189                                         local stanza = st.reply(stanza)
 190                                                 :tag('pubsub', {xmlns='http://jabber.org/protocol/pubsub'})
 191                                                         :tag('items', {node=node})
 192                                                 :up();
 193                                         session.send(stanza);
 194                                         return true;
 195                                 end
 196                         elseif node then -- node doesn't exist
 197                                 session.send(st.error_reply(stanza, 'cancel', 'item-not-found'));
 198                                 return true;
 199                         else --invalid request
 200                                 session.send(st.error_reply(stanza, 'modify', 'bad-request'));
 201                                 return true;
 202                         end
 203                 else --no presence subscription
 204                         session.send(st.error_reply(stanza, 'auth', 'not-authorized')
 205                                 :tag('presence-subscription-required', {xmlns='http://jabber.org/protocol/pubsub#errors'}));
 206                         return true;
 207                 end
 208         end
 209 end);
 210
 211 module:hook("iq/bare/disco", function(event)
 212         local session, stanza = event.origin, event.stanza;
 213         if stanza.attr.type == "result" then
 214                 local disco = stanza.tags[1];
 215                 if disco and disco.name == "query" and disco.attr.xmlns == "http://jabber.org/protocol/disco#info" then
 216                         -- Process disco response
 217                         local user = stanza.attr.to or (session.username..'@'..session.host);
 218                         local contact = stanza.attr.from;
 219                         local current = recipients[user] and recipients[user][contact];
 220                         if type(current) ~= "string" then return; end -- check if waiting for recipient's response
 221                         local ver = current;
 222                         if not string.find(current, "#") then
 223                                 ver = calculate_hash(disco.tags); -- calculate hash
 224                         end
 225                         local notify = {};
 226                         for _, feature in pairs(disco.tags) do
 227                                 if feature.name == "feature" and feature.attr.var then
 228                                         local nfeature = feature.attr.var:match("^(.*)%+notify$");
 229                                         if nfeature then notify[nfeature] = true; end
 230                                 end
 231                         end
 232                         hash_map[ver] = notify; -- update hash map
 233                         recipients[user][contact] = notify; -- set recipient's data to calculated data
 234                         -- send messages to recipient
 235                         publish_all(user, contact, session);
 236                 end
 237         end
 238 end);
 239
 240 module:hook("account-disco-info", function(event)
 241         local stanza = event.stanza;
 242         stanza:tag('identity', {category='pubsub', type='pep'}):up();
 243         stanza:tag('feature', {var='http://jabber.org/protocol/pubsub#publish'}):up();
 244 end);
 245
 246 module:hook("account-disco-items", function(event)
 247         local stanza = event.stanza;
 248         local bare = stanza.attr.to;
 249         local user_data = data[bare];
 250
 251         if user_data then
 252                 for node, _ in pairs(user_data) do
 253                         stanza:tag('item', {jid=bare, node=node}):up(); -- TODO we need to handle queries to these nodes
 254                 end
 255         end
 256 end);