plugins/mod_presence.lua

   1 -- Prosody IM v0.4
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 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 local log = module._log;
  10
  11 local require = require;
  12 local pairs, ipairs = pairs, ipairs;
  13 local t_concat, t_insert = table.concat, table.insert;
  14 local s_find = string.find;
  15 local tonumber = tonumber;
  16
  17 local st = require "util.stanza";
  18 local jid_split = require "util.jid".split;
  19 local jid_bare = require "util.jid".bare;
  20 local hosts = hosts;
  21
  22 local rostermanager = require "core.rostermanager";
  23 local sessionmanager = require "core.sessionmanager";
  24 local offlinemanager = require "core.offlinemanager";
  25
  26 local _core_route_stanza = core_route_stanza;
  27 local core_route_stanza;
  28 function core_route_stanza(origin, stanza)
  29         if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" and stanza.attr.type ~= "error" then
  30                 local node, host = jid_split(stanza.attr.to);
  31                 host = hosts[host];
  32                 if host and host.type == "local" then
  33                         handle_inbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to), core_route_stanza);
  34                         return;
  35                 end
  36         end
  37         _core_route_stanza(origin, stanza);
  38 end
  39
  40 local function select_top_resources(user)
  41         local priority = 0;
  42         local recipients = {};
  43         for _, session in pairs(user.sessions) do -- find resource with greatest priority
  44                 if session.presence then
  45                         -- TODO check active privacy list for session
  46                         local p = session.priority;
  47                         if p > priority then
  48                                 priority = p;
  49                                 recipients = {session};
  50                         elseif p == priority then
  51                                 t_insert(recipients, session);
  52                         end
  53                 end
  54         end
  55         return recipients;
  56 end
  57 local function recalc_resource_map(origin)
  58         local user = hosts[origin.host].sessions[origin.username];
  59         user.top_resources = select_top_resources(user);
  60         if #user.top_resources == 0 then user.top_resources = nil; end
  61 end
  62
  63 function handle_normal_presence(origin, stanza, core_route_stanza)
  64         local roster = origin.roster;
  65         local node, host = origin.username, origin.host;
  66         for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources
  67                 if res ~= origin and res.presence then -- to resource
  68                         stanza.attr.to = res.full_jid;
  69                         core_route_stanza(origin, stanza);
  70                 end
  71         end
  72         for jid, item in pairs(roster) do -- broadcast to all interested contacts
  73                 if item.subscription == "both" or item.subscription == "from" then
  74                         stanza.attr.to = jid;
  75                         core_route_stanza(origin, stanza);
  76                 end
  77         end
  78         if stanza.attr.type == nil and not origin.presence then -- initial presence
  79                 local probe = st.presence({from = origin.full_jid, type = "probe"});
  80                 for jid, item in pairs(roster) do -- probe all contacts we are subscribed to
  81                         if item.subscription == "both" or item.subscription == "to" then
  82                                 probe.attr.to = jid;
  83                                 core_route_stanza(origin, probe);
  84                         end
  85                 end
  86                 for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast from all available resources
  87                         if res ~= origin and res.presence then
  88                                 res.presence.attr.to = origin.full_jid;
  89                                 core_route_stanza(res, res.presence);
  90                                 res.presence.attr.to = nil;
  91                         end
  92                 end
  93                 if roster.pending then -- resend incoming subscription requests
  94                         for jid in pairs(roster.pending) do
  95                                 origin.send(st.presence({type="subscribe", from=jid})); -- TODO add to attribute? Use original?
  96                         end
  97                 end
  98                 local request = st.presence({type="subscribe", from=origin.username.."@"..origin.host});
  99                 for jid, item in pairs(roster) do -- resend outgoing subscription requests
 100                         if item.ask then
 101                                 request.attr.to = jid;
 102                                 core_route_stanza(origin, request);
 103                         end
 104                 end
 105                 local offline = offlinemanager.load(node, host);
 106                 if offline then
 107                         for _, msg in ipairs(offline) do
 108                                 origin.send(msg); -- FIXME do we need to modify to/from in any way?
 109                         end
 110                         offlinemanager.deleteAll(node, host);
 111                 end
 112         end
 113         if stanza.attr.type == "unavailable" then
 114                 origin.presence = nil;
 115                 if origin.priority then
 116                         origin.priority = nil;
 117                         recalc_resource_map(origin);
 118                 end
 119                 if origin.directed then
 120                         for jid in pairs(origin.directed) do
 121                                 stanza.attr.to = jid;
 122                                 core_route_stanza(origin, stanza);
 123                         end
 124                         origin.directed = nil;
 125                 end
 126         else
 127                 origin.presence = stanza;
 128                 local priority = stanza:child_with_name("priority");
 129                 if priority and #priority > 0 then
 130                         priority = t_concat(priority);
 131                         if s_find(priority, "^[+-]?[0-9]+$") then
 132                                 priority = tonumber(priority);
 133                                 if priority < -128 then priority = -128 end
 134                                 if priority > 127 then priority = 127 end
 135                         else priority = 0; end
 136                 else priority = 0; end
 137                 if origin.priority ~= priority then
 138                         origin.priority = priority;
 139                         recalc_resource_map(origin);
 140                 end
 141         end
 142         stanza.attr.to = nil; -- reset it
 143 end
 144
 145 function send_presence_of_available_resources(user, host, jid, recipient_session, core_route_stanza)
 146         local h = hosts[host];
 147         local count = 0;
 148         if h and h.type == "local" then
 149                 local u = h.sessions[user];
 150                 if u then
 151                         for k, session in pairs(u.sessions) do
 152                                 local pres = session.presence;
 153                                 if pres then
 154                                         pres.attr.to = jid;
 155                                         core_route_stanza(session, pres);
 156                                         pres.attr.to = nil;
 157                                         count = count + 1;
 158                                 end
 159                         end
 160                 end
 161         end
 162         log("debug", "broadcasted presence of "..count.." resources from "..user.."@"..host.." to "..jid);
 163         return count;
 164 end
 165
 166 function handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza)
 167         local node, host = jid_split(from_bare);
 168         local st_from, st_to = stanza.attr.from, stanza.attr.to;
 169         stanza.attr.from, stanza.attr.to = from_bare, to_bare;
 170         log("debug", "outbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
 171         if stanza.attr.type == "subscribe" then
 172                 -- 1. route stanza
 173                 -- 2. roster push (subscription = none, ask = subscribe)
 174                 if rostermanager.set_contact_pending_out(node, host, to_bare) then
 175                         rostermanager.roster_push(node, host, to_bare);
 176                 end -- else file error
 177                 core_route_stanza(origin, stanza);
 178         elseif stanza.attr.type == "unsubscribe" then
 179                 -- 1. route stanza
 180                 -- 2. roster push (subscription = none or from)
 181                 if rostermanager.unsubscribe(node, host, to_bare) then
 182                         rostermanager.roster_push(node, host, to_bare); -- FIXME do roster push when roster has in fact not changed?
 183                 end -- else file error
 184                 core_route_stanza(origin, stanza);
 185         elseif stanza.attr.type == "subscribed" then
 186                 -- 1. route stanza
 187                 -- 2. roster_push ()
 188                 -- 3. send_presence_of_available_resources
 189                 if rostermanager.subscribed(node, host, to_bare) then
 190                         rostermanager.roster_push(node, host, to_bare);
 191                 end
 192                 core_route_stanza(origin, stanza);
 193                 send_presence_of_available_resources(node, host, to_bare, origin, core_route_stanza);
 194         elseif stanza.attr.type == "unsubscribed" then
 195                 -- 1. route stanza
 196                 -- 2. roster push (subscription = none or to)
 197                 if rostermanager.unsubscribed(node, host, to_bare) then
 198                         rostermanager.roster_push(node, host, to_bare);
 199                 end
 200                 core_route_stanza(origin, stanza);
 201         end
 202         stanza.attr.from, stanza.attr.to = st_from, st_to;
 203 end
 204
 205 function handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza)
 206         local node, host = jid_split(to_bare);
 207         local st_from, st_to = stanza.attr.from, stanza.attr.to;
 208         stanza.attr.from, stanza.attr.to = from_bare, to_bare;
 209         log("debug", "inbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
 210         if stanza.attr.type == "probe" then
 211                 if rostermanager.is_contact_subscribed(node, host, from_bare) then
 212                         if 0 == send_presence_of_available_resources(node, host, st_from, origin, core_route_stanza) then
 213                                 -- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too)
 214                         end
 215                 else
 216                         core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="unsubscribed"}));
 217                 end
 218         elseif stanza.attr.type == "subscribe" then
 219                 if rostermanager.is_contact_subscribed(node, host, from_bare) then
 220                         core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="subscribed"})); -- already subscribed
 221                         -- Sending presence is not clearly stated in the RFC, but it seems appropriate
 222                         if 0 == send_presence_of_available_resources(node, host, from_bare, origin, core_route_stanza) then
 223                                 -- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too)
 224                         end
 225                 else
 226                         if not rostermanager.is_contact_pending_in(node, host, from_bare) then
 227                                 if rostermanager.set_contact_pending_in(node, host, from_bare) then
 228                                         sessionmanager.send_to_available_resources(node, host, stanza);
 229                                 end -- TODO else return error, unable to save
 230                         end
 231                 end
 232         elseif stanza.attr.type == "unsubscribe" then
 233                 if rostermanager.process_inbound_unsubscribe(node, host, from_bare) then
 234                         rostermanager.roster_push(node, host, from_bare);
 235                 end
 236         elseif stanza.attr.type == "subscribed" then
 237                 if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then
 238                         rostermanager.roster_push(node, host, from_bare);
 239                 end
 240         elseif stanza.attr.type == "unsubscribed" then
 241                 if rostermanager.process_inbound_subscription_cancellation(node, host, from_bare) then
 242                         rostermanager.roster_push(node, host, from_bare);
 243                 end
 244         end -- discard any other type
 245         stanza.attr.from, stanza.attr.to = st_from, st_to;
 246 end
 247
 248 local outbound_presence_handler = function(data)
 249         -- outbound presence recieved
 250         local origin, stanza = data.origin, data.stanza;
 251
 252         local to = stanza.attr.to;
 253         if to then
 254                 local t = stanza.attr.type;
 255                 if t ~= nil and t ~= "unavailable" and t ~= "error" then -- check for subscriptions and probes
 256                         handle_outbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to), core_route_stanza);
 257                         return true;
 258                 end
 259
 260                 local to_bare = jid_bare(to);
 261                 if not(origin.roster[to_bare] and (origin.roster[to_bare].subscription == "both" or origin.roster[to_bare].subscription == "from")) then -- directed presence
 262                         origin.directed = origin.directed or {};
 263                         if t then -- removing from directed presence list on sending an error or unavailable
 264                                 origin.directed[to] = nil; -- FIXME does it make more sense to add to_bare rather than to?
 265                         else
 266                                 origin.directed[to] = true; -- FIXME does it make more sense to add to_bare rather than to?
 267                         end
 268                 end
 269         end -- TODO maybe handle normal presence here, instead of letting it pass to incoming handlers?
 270 end
 271
 272 module:hook("pre-presence/full", outbound_presence_handler);
 273 module:hook("pre-presence/bare", outbound_presence_handler);
 274 module:hook("pre-presence/host", outbound_presence_handler);
 275
 276 module:hook("presence/bare", function(data)
 277         -- inbound presence to bare JID recieved
 278         local origin, stanza = data.origin, data.stanza;
 279
 280         local to = stanza.attr.to;
 281         local t = stanza.attr.type;
 282         if to then
 283                 if t ~= nil and t ~= "unavailable" and t ~= "error" then -- check for subscriptions and probes sent to bare JID
 284                         handle_inbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to), core_route_stanza);
 285                         return true;
 286                 end
 287
 288                 local user = bare_sessions[to];
 289                 if user then
 290                         for _, session in pairs(user.sessions) do
 291                                 if session.presence then -- only send to available resources
 292                                         session.send(stanza);
 293                                 end
 294                         end
 295                 end -- no resources not online, discard
 296         elseif not t or t == "unavailable" then
 297                 handle_normal_presence(origin, stanza, core_route_stanza);
 298         end
 299         return true;
 300 end);
 301 module:hook("presence/full", function(data)
 302         -- inbound presence to full JID recieved
 303         local origin, stanza = data.origin, data.stanza;
 304
 305         local t = stanza.attr.type;
 306         if t ~= nil and t ~= "unavailable" and t ~= "error" then -- check for subscriptions and probes sent to full JID
 307                 handle_inbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to), core_route_stanza);
 308                 return true;
 309         end
 310
 311         local session = full_sessions[stanza.attr.to];
 312         if session then
 313                 -- TODO fire post processing event
 314                 session.send(stanza);
 315         end -- resource not online, discard
 316         return true;
 317 end);
 318
 319 module:hook("resource-unbind", function(event)
 320         local session, err = event.session, event.error;
 321         -- Send unavailable presence
 322         if session.presence then
 323                 local pres = st.presence{ type = "unavailable" };
 324                 if not(err) or err == "closed" then err = "connection closed"; end
 325                 pres:tag("status"):text("Disconnected: "..err):up();
 326                 session:dispatch_stanza(pres);
 327         elseif session.directed then
 328                 local pres = st.presence{ type = "unavailable" };
 329                 if not(err) or err == "closed" then err = "connection closed"; end
 330                 pres:tag("status"):text("Disconnected: "..err):up();
 331                 for jid in pairs(session.directed) do
 332                         pres.attr.to = jid;
 333                         core_route_stanza(session, pres);
 334                 end
 335                 session.directed = nil;
 336         end
 337 end);