plugins/mod_presence.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 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 local NULL = {};
  22
  23 local rostermanager = require "core.rostermanager";
  24 local sessionmanager = require "core.sessionmanager";
  25
  26 local function select_top_resources(user)
  27         local priority = 0;
  28         local recipients = {};
  29         for _, session in pairs(user.sessions) do -- find resource with greatest priority
  30                 if session.presence then
  31                         -- TODO check active privacy list for session
  32                         local p = session.priority;
  33                         if p > priority then
  34                                 priority = p;
  35                                 recipients = {session};
  36                         elseif p == priority then
  37                                 t_insert(recipients, session);
  38                         end
  39                 end
  40         end
  41         return recipients;
  42 end
  43 local function recalc_resource_map(user)
  44         if user then
  45                 user.top_resources = select_top_resources(user);
  46                 if #user.top_resources == 0 then user.top_resources = nil; end
  47         end
  48 end
  49
  50 local ignore_presence_priority = module:get_option("ignore_presence_priority");
  51
  52 function handle_normal_presence(origin, stanza)
  53         if ignore_presence_priority then
  54                 local priority = stanza:child_with_name("priority");
  55                 if priority and priority[1] ~= "0" then
  56                         for i=#priority.tags,1,-1 do priority.tags[i] = nil; end
  57                         for i=#priority,1,-1 do priority[i] = nil; end
  58                         priority[1] = "0";
  59                 end
  60         end
  61         local priority = stanza:child_with_name("priority");
  62         if priority and #priority > 0 then
  63                 priority = t_concat(priority);
  64                 if s_find(priority, "^[+-]?[0-9]+$") then
  65                         priority = tonumber(priority);
  66                         if priority < -128 then priority = -128 end
  67                         if priority > 127 then priority = 127 end
  68                 else priority = 0; end
  69         else priority = 0; end
  70         if full_sessions[origin.full_jid] then -- if user is still connected
  71                 origin.send(stanza); -- reflect their presence back to them
  72         end
  73         local roster = origin.roster;
  74         local node, host = origin.username, origin.host;
  75         local user = bare_sessions[node.."@"..host];
  76         for _, res in pairs(user and user.sessions or NULL) do -- broadcast to all resources
  77                 if res ~= origin and res.presence then -- to resource
  78                         stanza.attr.to = res.full_jid;
  79                         core_post_stanza(origin, stanza, true);
  80                 end
  81         end
  82         for jid, item in pairs(roster) do -- broadcast to all interested contacts
  83                 if item.subscription == "both" or item.subscription == "from" then
  84                         stanza.attr.to = jid;
  85                         core_post_stanza(origin, stanza, true);
  86                 end
  87         end
  88         if stanza.attr.type == nil and not origin.presence then -- initial presence
  89                 origin.presence = stanza; -- FIXME repeated later
  90                 local probe = st.presence({from = origin.full_jid, type = "probe"});
  91                 for jid, item in pairs(roster) do -- probe all contacts we are subscribed to
  92                         if item.subscription == "both" or item.subscription == "to" then
  93                                 probe.attr.to = jid;
  94                                 core_post_stanza(origin, probe, true);
  95                         end
  96                 end
  97                 for _, res in pairs(user and user.sessions or NULL) do -- broadcast from all available resources
  98                         if res ~= origin and res.presence then
  99                                 res.presence.attr.to = origin.full_jid;
 100                                 core_post_stanza(res, res.presence, true);
 101                                 res.presence.attr.to = nil;
 102                         end
 103                 end
 104                 if roster.pending then -- resend incoming subscription requests
 105                         for jid in pairs(roster.pending) do
 106                                 origin.send(st.presence({type="subscribe", from=jid})); -- TODO add to attribute? Use original?
 107                         end
 108                 end
 109                 local request = st.presence({type="subscribe", from=origin.username.."@"..origin.host});
 110                 for jid, item in pairs(roster) do -- resend outgoing subscription requests
 111                         if item.ask then
 112                                 request.attr.to = jid;
 113                                 core_post_stanza(origin, request, true);
 114                         end
 115                 end
 116
 117                 if priority >= 0 then
 118                         local event = { origin = origin }
 119                         module:fire_event('message/offline/broadcast', event);
 120                         module:fire_event('message/offline/delete', event);
 121                 end
 122         end
 123         if stanza.attr.type == "unavailable" then
 124                 origin.presence = nil;
 125                 if origin.priority then
 126                         origin.priority = nil;
 127                         recalc_resource_map(user);
 128                 end
 129                 if origin.directed then
 130                         for jid in pairs(origin.directed) do
 131                                 stanza.attr.to = jid;
 132                                 core_post_stanza(origin, stanza, true);
 133                         end
 134                         origin.directed = nil;
 135                 end
 136         else
 137                 origin.presence = stanza;
 138                 if origin.priority ~= priority then
 139                         origin.priority = priority;
 140                         recalc_resource_map(user);
 141                 end
 142         end
 143         stanza.attr.to = nil; -- reset it
 144 end
 145
 146 function send_presence_of_available_resources(user, host, jid, recipient_session, stanza)
 147         local h = hosts[host];
 148         local count = 0;
 149         if h and h.type == "local" then
 150                 local u = h.sessions[user];
 151                 if u then
 152                         for k, session in pairs(u.sessions) do
 153                                 local pres = session.presence;
 154                                 if pres then
 155                                         if stanza then pres = stanza; pres.attr.from = session.full_jid; end
 156                                         pres.attr.to = jid;
 157                                         core_post_stanza(session, pres, true);
 158                                         pres.attr.to = nil;
 159                                         count = count + 1;
 160                                 end
 161                         end
 162                 end
 163         end
 164         log("debug", "broadcasted presence of "..count.." resources from "..user.."@"..host.." to "..jid);
 165         return count;
 166 end
 167
 168 function handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare)
 169         local node, host = jid_split(from_bare);
 170         if to_bare == from_bare then return; end -- No self contacts
 171         local st_from, st_to = stanza.attr.from, stanza.attr.to;
 172         stanza.attr.from, stanza.attr.to = from_bare, to_bare;
 173         log("debug", "outbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
 174         if stanza.attr.type == "probe" then
 175                 stanza.attr.from, stanza.attr.to = st_from, st_to;
 176                 return;
 177         elseif stanza.attr.type == "subscribe" then
 178                 -- 1. route stanza
 179                 -- 2. roster push (subscription = none, ask = subscribe)
 180                 if rostermanager.set_contact_pending_out(node, host, to_bare) then
 181                         rostermanager.roster_push(node, host, to_bare);
 182                 end -- else file error
 183                 core_post_stanza(origin, stanza);
 184         elseif stanza.attr.type == "unsubscribe" then
 185                 -- 1. route stanza
 186                 -- 2. roster push (subscription = none or from)
 187                 if rostermanager.unsubscribe(node, host, to_bare) then
 188                         rostermanager.roster_push(node, host, to_bare); -- FIXME do roster push when roster has in fact not changed?
 189                 end -- else file error
 190                 core_post_stanza(origin, stanza);
 191         elseif stanza.attr.type == "subscribed" then
 192                 -- 1. route stanza
 193                 -- 2. roster_push ()
 194                 -- 3. send_presence_of_available_resources
 195                 if rostermanager.subscribed(node, host, to_bare) then
 196                         rostermanager.roster_push(node, host, to_bare);
 197                 end
 198                 core_post_stanza(origin, stanza);
 199                 send_presence_of_available_resources(node, host, to_bare, origin);
 200         elseif stanza.attr.type == "unsubscribed" then
 201                 -- 1. route stanza
 202                 -- 2. roster push (subscription = none or to)
 203                 if rostermanager.unsubscribed(node, host, to_bare) then
 204                         rostermanager.roster_push(node, host, to_bare);
 205                 end
 206                 core_post_stanza(origin, stanza);
 207         end
 208         stanza.attr.from, stanza.attr.to = st_from, st_to;
 209         return true;
 210 end
 211
 212 function handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare)
 213         local node, host = jid_split(to_bare);
 214         local st_from, st_to = stanza.attr.from, stanza.attr.to;
 215         stanza.attr.from, stanza.attr.to = from_bare, to_bare;
 216         log("debug", "inbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
 217
 218         if stanza.attr.type == "probe" then
 219                 local result, err = rostermanager.is_contact_subscribed(node, host, from_bare);
 220                 if result then
 221                         if 0 == send_presence_of_available_resources(node, host, st_from, origin) then
 222                                 core_post_stanza(hosts[host], st.presence({from=to_bare, to=st_from, type="unavailable"}), true); -- TODO send last activity
 223                         end
 224                 elseif not err then
 225                         core_post_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="unsubscribed"}), true);
 226                 end
 227         elseif stanza.attr.type == "subscribe" then
 228                 if rostermanager.is_contact_subscribed(node, host, from_bare) then
 229                         core_post_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="subscribed"}), true); -- already subscribed
 230                         -- Sending presence is not clearly stated in the RFC, but it seems appropriate
 231                         if 0 == send_presence_of_available_resources(node, host, from_bare, origin) then
 232                                 core_post_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="unavailable"}), true); -- TODO send last activity
 233                         end
 234                 else
 235                         core_post_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="unavailable"}), true); -- acknowledging receipt
 236                         if not rostermanager.is_contact_pending_in(node, host, from_bare) then
 237                                 if rostermanager.set_contact_pending_in(node, host, from_bare) then
 238                                         sessionmanager.send_to_available_resources(node, host, stanza);
 239                                 end -- TODO else return error, unable to save
 240                         end
 241                 end
 242         elseif stanza.attr.type == "unsubscribe" then
 243                 if rostermanager.process_inbound_unsubscribe(node, host, from_bare) then
 244                         sessionmanager.send_to_interested_resources(node, host, stanza);
 245                         rostermanager.roster_push(node, host, from_bare);
 246                 end
 247         elseif stanza.attr.type == "subscribed" then
 248                 if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then
 249                         sessionmanager.send_to_interested_resources(node, host, stanza);
 250                         rostermanager.roster_push(node, host, from_bare);
 251                 end
 252         elseif stanza.attr.type == "unsubscribed" then
 253                 if rostermanager.process_inbound_subscription_cancellation(node, host, from_bare) then
 254                         sessionmanager.send_to_interested_resources(node, host, stanza);
 255                         rostermanager.roster_push(node, host, from_bare);
 256                 end
 257         end -- discard any other type
 258         stanza.attr.from, stanza.attr.to = st_from, st_to;
 259         return true;
 260 end
 261
 262 local outbound_presence_handler = function(data)
 263         -- outbound presence recieved
 264         local origin, stanza = data.origin, data.stanza;
 265
 266         local to = stanza.attr.to;
 267         if to then
 268                 local t = stanza.attr.type;
 269                 if t ~= nil and t ~= "unavailable" and t ~= "error" then -- check for subscriptions and probes
 270                         return handle_outbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to));
 271                 end
 272
 273                 local to_bare = jid_bare(to);
 274                 local roster = origin.roster;
 275                 if roster and not(roster[to_bare] and (roster[to_bare].subscription == "both" or roster[to_bare].subscription == "from")) then -- directed presence
 276                         origin.directed = origin.directed or {};
 277                         if t then -- removing from directed presence list on sending an error or unavailable
 278                                 origin.directed[to] = nil; -- FIXME does it make more sense to add to_bare rather than to?
 279                         else
 280                                 origin.directed[to] = true; -- FIXME does it make more sense to add to_bare rather than to?
 281                         end
 282                 end
 283         end -- TODO maybe handle normal presence here, instead of letting it pass to incoming handlers?
 284 end
 285
 286 module:hook("pre-presence/full", outbound_presence_handler);
 287 module:hook("pre-presence/bare", outbound_presence_handler);
 288 module:hook("pre-presence/host", outbound_presence_handler);
 289
 290 module:hook("presence/bare", function(data)
 291         -- inbound presence to bare JID recieved
 292         local origin, stanza = data.origin, data.stanza;
 293
 294         local to = stanza.attr.to;
 295         local t = stanza.attr.type;
 296         if to then
 297                 if t ~= nil and t ~= "unavailable" and t ~= "error" then -- check for subscriptions and probes sent to bare JID
 298                         return handle_inbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to));
 299                 end
 300
 301                 local user = bare_sessions[to];
 302                 if user then
 303                         for _, session in pairs(user.sessions) do
 304                                 if session.presence then -- only send to available resources
 305                                         session.send(stanza);
 306                                 end
 307                         end
 308                 end -- no resources not online, discard
 309         elseif not t or t == "unavailable" then
 310                 handle_normal_presence(origin, stanza);
 311         end
 312         return true;
 313 end);
 314 module:hook("presence/full", function(data)
 315         -- inbound presence to full JID recieved
 316         local origin, stanza = data.origin, data.stanza;
 317
 318         local t = stanza.attr.type;
 319         if t ~= nil and t ~= "unavailable" and t ~= "error" then -- check for subscriptions and probes sent to full JID
 320                 return handle_inbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to));
 321         end
 322
 323         local session = full_sessions[stanza.attr.to];
 324         if session then
 325                 -- TODO fire post processing event
 326                 session.send(stanza);
 327         end -- resource not online, discard
 328         return true;
 329 end);
 330 module:hook("presence/host", function(data)
 331         -- inbound presence to the host
 332         local origin, stanza = data.origin, data.stanza;
 333
 334         local from_bare = jid_bare(stanza.attr.from);
 335         local t = stanza.attr.type;
 336         if t == "probe" then
 337                 core_post_stanza(hosts[module.host], st.presence({ from = module.host, to = from_bare, id = stanza.attr.id }));
 338         elseif t == "subscribe" then
 339                 core_post_stanza(hosts[module.host], st.presence({ from = module.host, to = from_bare, id = stanza.attr.id, type = "subscribed" }));
 340                 core_post_stanza(hosts[module.host], st.presence({ from = module.host, to = from_bare, id = stanza.attr.id }));
 341         end
 342         return true;
 343 end);
 344
 345 module:hook("resource-unbind", function(event)
 346         local session, err = event.session, event.error;
 347         -- Send unavailable presence
 348         if session.presence then
 349                 local pres = st.presence{ type = "unavailable" };
 350                 if not(err) or err == "closed" then err = "connection closed"; end
 351                 pres:tag("status"):text("Disconnected: "..err):up();
 352                 session:dispatch_stanza(pres);
 353         elseif session.directed then
 354                 local pres = st.presence{ type = "unavailable", from = session.full_jid };
 355                 if not(err) or err == "closed" then err = "connection closed"; end
 356                 pres:tag("status"):text("Disconnected: "..err):up();
 357                 for jid in pairs(session.directed) do
 358                         pres.attr.to = jid;
 359                         core_post_stanza(session, pres, true);
 360                 end
 361                 session.directed = nil;
 362         end
 363 end);