core/presencemanager.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
  10
  11 local log = require "util.logger".init("presencemanager")
  12
  13 local require = require;
  14 local pairs, ipairs = pairs, ipairs;
  15 local t_concat = table.concat;
  16 local s_find = string.find;
  17 local tonumber = tonumber;
  18
  19 local st = require "util.stanza";
  20 local jid_split = require "util.jid".split;
  21 local hosts = hosts;
  22
  23 local rostermanager = require "core.rostermanager";
  24 local sessionmanager = require "core.sessionmanager";
  25 local offlinemanager = require "core.offlinemanager";
  26
  27 module "presencemanager"
  28
  29 function handle_presence(origin, stanza, from_bare, to_bare, core_route_stanza, inbound)
  30         local type = stanza.attr.type;
  31         if type and type ~= "unavailable" and type ~= "error" then
  32                 if inbound then
  33                         handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
  34                 else
  35                         handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
  36                 end
  37         elseif not inbound and not stanza.attr.to then
  38                 handle_normal_presence(origin, stanza, core_route_stanza);
  39         else
  40                 core_route_stanza(origin, stanza);
  41         end
  42 end
  43
  44 function handle_normal_presence(origin, stanza, core_route_stanza)
  45         if origin.roster then
  46                 for jid in pairs(origin.roster) do -- broadcast to all interested contacts
  47                         local subscription = origin.roster[jid].subscription;
  48                         if subscription == "both" or subscription == "from" then
  49                                 stanza.attr.to = jid;
  50                                 core_route_stanza(origin, stanza);
  51                         end
  52                 end
  53                 local node, host = jid_split(stanza.attr.from);
  54                 for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources
  55                         if res ~= origin and res.full_jid then -- to resource. FIXME is res.full_jid the correct check? Maybe it should be res.presence
  56                                 stanza.attr.to = res.full_jid;
  57                                 core_route_stanza(origin, stanza);
  58                         end
  59                 end
  60                 if stanza.attr.type == nil and not origin.presence then -- initial presence
  61                         local probe = st.presence({from = origin.full_jid, type = "probe"});
  62                         for jid in pairs(origin.roster) do -- probe all contacts we are subscribed to
  63                                 local subscription = origin.roster[jid].subscription;
  64                                 if subscription == "both" or subscription == "to" then
  65                                         probe.attr.to = jid;
  66                                         core_route_stanza(origin, probe);
  67                                 end
  68                         end
  69                         for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast from all available resources
  70                                 if res ~= origin and res.presence then
  71                                         res.presence.attr.to = origin.full_jid;
  72                                         core_route_stanza(res, res.presence);
  73                                         res.presence.attr.to = nil;
  74                                 end
  75                         end
  76                         if origin.roster.pending then -- resend incoming subscription requests
  77                                 for jid in pairs(origin.roster.pending) do
  78                                         origin.send(st.presence({type="subscribe", from=jid})); -- TODO add to attribute? Use original?
  79                                 end
  80                         end
  81                         local request = st.presence({type="subscribe", from=origin.username.."@"..origin.host});
  82                         for jid, item in pairs(origin.roster) do -- resend outgoing subscription requests
  83                                 if item.ask then
  84                                         request.attr.to = jid;
  85                                         core_route_stanza(origin, request);
  86                                 end
  87                         end
  88                         local offline = offlinemanager.load(node, host);
  89                         if offline then
  90                                 for _, msg in ipairs(offline) do
  91                                         origin.send(msg); -- FIXME do we need to modify to/from in any way?
  92                                 end
  93                                 offlinemanager.deleteAll(node, host);
  94                         end
  95                 end
  96                 origin.priority = 0;
  97                 if stanza.attr.type == "unavailable" then
  98                         origin.presence = nil;
  99                         if origin.directed then
 100                                 local old_from = stanza.attr.from;
 101                                 stanza.attr.from = origin.full_jid;
 102                                 for jid in pairs(origin.directed) do
 103                                         stanza.attr.to = jid;
 104                                         core_route_stanza(origin, stanza);
 105                                 end
 106                                 stanza.attr.from = old_from;
 107                                 origin.directed = nil;
 108                         end
 109                 else
 110                         origin.presence = stanza;
 111                         local priority = stanza:child_with_name("priority");
 112                         if priority and #priority > 0 then
 113                                 priority = t_concat(priority);
 114                                 if s_find(priority, "^[+-]?[0-9]+$") then
 115                                         priority = tonumber(priority);
 116                                         if priority < -128 then priority = -128 end
 117                                         if priority > 127 then priority = 127 end
 118                                         origin.priority = priority;
 119                                 end
 120                         end
 121                 end
 122                 stanza.attr.to = nil; -- reset it
 123         else
 124                 log("error", "presence recieved from client with no roster");
 125         end
 126 end
 127
 128 function send_presence_of_available_resources(user, host, jid, recipient_session, core_route_stanza)
 129         local h = hosts[host];
 130         local count = 0;
 131         if h and h.type == "local" then
 132                 local u = h.sessions[user];
 133                 if u then
 134                         for k, session in pairs(u.sessions) do
 135                                 local pres = session.presence;
 136                                 if pres then
 137                                         pres.attr.to = jid;
 138                                         pres.attr.from = session.full_jid;
 139                                         core_route_stanza(session, pres);
 140                                         pres.attr.to = nil;
 141                                         pres.attr.from = nil;
 142                                         count = count + 1;
 143                                 end
 144                         end
 145                 end
 146         end
 147         log("debug", "broadcasted presence of "..count.." resources from "..user.."@"..host.." to "..jid);
 148         return count;
 149 end
 150
 151 function handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza)
 152         local node, host = jid_split(from_bare);
 153         local st_from, st_to = stanza.attr.from, stanza.attr.to;
 154         stanza.attr.from, stanza.attr.to = from_bare, to_bare;
 155         log("debug", "outbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
 156         if stanza.attr.type == "subscribe" then
 157                 -- 1. route stanza
 158                 -- 2. roster push (subscription = none, ask = subscribe)
 159                 if rostermanager.set_contact_pending_out(node, host, to_bare) then
 160                         rostermanager.roster_push(node, host, to_bare);
 161                 end -- else file error
 162                 core_route_stanza(origin, stanza);
 163         elseif stanza.attr.type == "unsubscribe" then
 164                 -- 1. route stanza
 165                 -- 2. roster push (subscription = none or from)
 166                 if rostermanager.unsubscribe(node, host, to_bare) then
 167                         rostermanager.roster_push(node, host, to_bare); -- FIXME do roster push when roster has in fact not changed?
 168                 end -- else file error
 169                 core_route_stanza(origin, stanza);
 170         elseif stanza.attr.type == "subscribed" then
 171                 -- 1. route stanza
 172                 -- 2. roster_push ()
 173                 -- 3. send_presence_of_available_resources
 174                 if rostermanager.subscribed(node, host, to_bare) then
 175                         rostermanager.roster_push(node, host, to_bare);
 176                 end
 177                 core_route_stanza(origin, stanza);
 178                 send_presence_of_available_resources(node, host, to_bare, origin, core_route_stanza);
 179         elseif stanza.attr.type == "unsubscribed" then
 180                 -- 1. route stanza
 181                 -- 2. roster push (subscription = none or to)
 182                 if rostermanager.unsubscribed(node, host, to_bare) then
 183                         rostermanager.roster_push(node, host, to_bare);
 184                 end
 185                 core_route_stanza(origin, stanza);
 186         end
 187         stanza.attr.from, stanza.attr.to = st_from, st_to;
 188 end
 189
 190 function handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza)
 191         local node, host = jid_split(to_bare);
 192         local st_from, st_to = stanza.attr.from, stanza.attr.to;
 193         stanza.attr.from, stanza.attr.to = from_bare, to_bare;
 194         log("debug", "inbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
 195         if stanza.attr.type == "probe" then
 196                 if rostermanager.is_contact_subscribed(node, host, from_bare) then
 197                         if 0 == send_presence_of_available_resources(node, host, from_bare, origin, core_route_stanza) then
 198                                 -- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too)
 199                         end
 200                 else
 201                         core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="unsubscribed"}));
 202                 end
 203         elseif stanza.attr.type == "subscribe" then
 204                 if rostermanager.is_contact_subscribed(node, host, from_bare) then
 205                         core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="subscribed"})); -- already subscribed
 206                         -- Sending presence is not clearly stated in the RFC, but it seems appropriate
 207                         if 0 == send_presence_of_available_resources(node, host, from_bare, origin, core_route_stanza) then
 208                                 -- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too)
 209                         end
 210                 else
 211                         if not rostermanager.is_contact_pending_in(node, host, from_bare) then
 212                                 if rostermanager.set_contact_pending_in(node, host, from_bare) then
 213                                         sessionmanager.send_to_available_resources(node, host, stanza);
 214                                 end -- TODO else return error, unable to save
 215                         end
 216                 end
 217         elseif stanza.attr.type == "unsubscribe" then
 218                 if rostermanager.process_inbound_unsubscribe(node, host, from_bare) then
 219                         rostermanager.roster_push(node, host, from_bare);
 220                 end
 221         elseif stanza.attr.type == "subscribed" then
 222                 if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then
 223                         rostermanager.roster_push(node, host, from_bare);
 224                 end
 225         elseif stanza.attr.type == "unsubscribed" then
 226                 if rostermanager.process_inbound_subscription_cancellation(node, host, from_bare) then
 227                         rostermanager.roster_push(node, host, from_bare);
 228                 end
 229         end -- discard any other type
 230         stanza.attr.from, stanza.attr.to = st_from, st_to;
 231 end
 232
 233 return _M;