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         local self = not stanza.attr.to;
 121
 122         if not t then -- available presence
 123                 if self or subscription_presence(user, stanza.attr.from) then
 124                         local recipient = stanza.attr.from;
 125                         local current = recipients[user] and recipients[user][recipient];
 126                         local hash = get_caps_hash_from_presence(stanza, current);
 127                         if current == hash then return; end
 128                         if not hash then
 129                                 if recipients[user] then recipients[user][recipient] = nil; end
 130                         else
 131                                 recipients[user] = recipients[user] or {};
 132                                 if hash_map[hash] then
 133                                         recipients[user][recipient] = hash_map[hash];
 134                                         publish_all(user, recipient, origin);
 135                                 else
 136                                         recipients[user][recipient] = hash;
 137                                         if self or origin.type ~= "c2s" then
 138                                                 origin.send(
 139                                                         st.stanza("iq", {from=stanza.attr.to, to=stanza.attr.from, id="disco", type="get"})
 140                                                                 :query("http://jabber.org/protocol/disco#info")
 141                                                 );
 142                                         end
 143                                 end
 144                         end
 145                 end
 146         elseif t == "unavailable" then
 147                 if recipients[user] then recipients[user][stanza.attr.from] = nil; end
 148         elseif not self and t == "unsubscribe" then
 149                 local from = jid_bare(stanza.attr.from);
 150                 local subscriptions = recipients[user];
 151                 if subscriptions then
 152                         for subscriber in pairs(subscriptions) do
 153                                 if jid_bare(subscriber) == from then
 154                                         recipients[user][subscriber] = nil;
 155                                 end
 156                         end
 157                 end
 158         end
 159 end, 10);
 160
 161 module:hook("iq/bare/http://jabber.org/protocol/pubsub:pubsub", function(event)
 162         local session, stanza = event.origin, event.stanza;
 163         local payload = stanza.tags[1];
 164
 165         if stanza.attr.type == 'set' and (not stanza.attr.to or jid_bare(stanza.attr.from) == stanza.attr.to) then
 166                 payload = payload.tags[1];
 167                 if payload and (payload.name == 'publish' or payload.name == 'retract') and payload.attr.node then -- <publish node='http://jabber.org/protocol/tune'>
 168                         local node = payload.attr.node;
 169                         payload = payload.tags[1];
 170                         if payload and payload.name == "item" then -- <item>
 171                                 local id = payload.attr.id;
 172                                 session.send(st.reply(stanza));
 173                                 publish(session, node, id, st.clone(payload));
 174                                 return true;
 175                         end
 176                 end
 177         elseif stanza.attr.type == 'get' then
 178                 local user = stanza.attr.to and jid_bare(stanza.attr.to) or session.username..'@'..session.host;
 179                 if subscription_presence(user, stanza.attr.from) then
 180                         local user_data = data[user];
 181                         local node, requested_id;
 182                         payload = payload.tags[1];
 183                         if payload and payload.name == 'items' then
 184                                 node = payload.attr.node;
 185                                 local item = payload.tags[1];
 186                                 if item and item.name == "item" then
 187                                         requested_id = item.attr.id;
 188                                 end
 189                         end
 190                         if node and user_data and user_data[node] then -- Send the last item
 191                                 local id, item = unpack(user_data[node]);
 192                                 if not requested_id or id == requested_id then
 193                                         local stanza = st.reply(stanza)
 194                                                 :tag('pubsub', {xmlns='http://jabber.org/protocol/pubsub'})
 195                                                         :tag('items', {node=node})
 196                                                                 :add_child(item)
 197                                                         :up()
 198                                                 :up();
 199                                         session.send(stanza);
 200                                         return true;
 201                                 else -- requested item doesn't exist
 202                                         local stanza = st.reply(stanza)
 203                                                 :tag('pubsub', {xmlns='http://jabber.org/protocol/pubsub'})
 204                                                         :tag('items', {node=node})
 205                                                 :up();
 206                                         session.send(stanza);
 207                                         return true;
 208                                 end
 209                         elseif node then -- node doesn't exist
 210                                 session.send(st.error_reply(stanza, 'cancel', 'item-not-found'));
 211                                 return true;
 212                         else --invalid request
 213                                 session.send(st.error_reply(stanza, 'modify', 'bad-request'));
 214                                 return true;
 215                         end
 216                 else --no presence subscription
 217                         session.send(st.error_reply(stanza, 'auth', 'not-authorized')
 218                                 :tag('presence-subscription-required', {xmlns='http://jabber.org/protocol/pubsub#errors'}));
 219                         return true;
 220                 end
 221         end
 222 end);
 223
 224 module:hook("iq-result/bare/disco", function(event)
 225         local session, stanza = event.origin, event.stanza;
 226         if stanza.attr.type == "result" then
 227                 local disco = stanza.tags[1];
 228                 if disco and disco.name == "query" and disco.attr.xmlns == "http://jabber.org/protocol/disco#info" then
 229                         -- Process disco response
 230                         local self = not stanza.attr.to;
 231                         local user = stanza.attr.to or (session.username..'@'..session.host);
 232                         local contact = stanza.attr.from;
 233                         local current = recipients[user] and recipients[user][contact];
 234                         if type(current) ~= "string" then return; end -- check if waiting for recipient's response
 235                         local ver = current;
 236                         if not string.find(current, "#") then
 237                                 ver = calculate_hash(disco.tags); -- calculate hash
 238                         end
 239                         local notify = {};
 240                         for _, feature in pairs(disco.tags) do
 241                                 if feature.name == "feature" and feature.attr.var then
 242                                         local nfeature = feature.attr.var:match("^(.*)%+notify$");
 243                                         if nfeature then notify[nfeature] = true; end
 244                                 end
 245                         end
 246                         hash_map[ver] = notify; -- update hash map
 247                         if self then
 248                                 for jid, item in pairs(session.roster) do -- for all interested contacts
 249                                         if item.subscription == "both" or item.subscription == "from" then
 250                                                 if not recipients[jid] then recipients[jid] = {}; end
 251                                                 recipients[jid][contact] = notify;
 252                                                 publish_all(jid, contact, session);
 253                                         end
 254                                 end
 255                         end
 256                         recipients[user][contact] = notify; -- set recipient's data to calculated data
 257                         -- send messages to recipient
 258                         publish_all(user, contact, session);
 259                 end
 260         end
 261 end);
 262
 263 module:hook("account-disco-info", function(event)
 264         local stanza = event.stanza;
 265         stanza:tag('identity', {category='pubsub', type='pep'}):up();
 266         stanza:tag('feature', {var='http://jabber.org/protocol/pubsub#publish'}):up();
 267 end);
 268
 269 module:hook("account-disco-items", function(event)
 270         local stanza = event.stanza;
 271         local bare = stanza.attr.to;
 272         local user_data = data[bare];
 273
 274         if user_data then
 275                 for node, _ in pairs(user_data) do
 276                         stanza:tag('item', {jid=bare, node=node}):up(); -- TODO we need to handle queries to these nodes
 277                 end
 278         end
 279 end);