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1009
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1 -- Prosody IM v0.4
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9
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10
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11 local log = require "util.logger".init("mod_presence")
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12
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13 local require = require;
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14 local pairs, ipairs = pairs, ipairs;
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15 local t_concat = table.concat;
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16 local s_find = string.find;
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17 local tonumber = tonumber;
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18
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19 local st = require "util.stanza";
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20 local jid_split = require "util.jid".split;
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21 local jid_bare = require "util.jid".bare;
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22 local hosts = hosts;
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23
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24 local rostermanager = require "core.rostermanager";
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25 local sessionmanager = require "core.sessionmanager";
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26 local offlinemanager = require "core.offlinemanager";
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27
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28 function handle_presence(origin, stanza, from_bare, to_bare, core_route_stanza, inbound)
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29 local type = stanza.attr.type;
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30 if type and type ~= "unavailable" and type ~= "error" then
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31 if inbound then
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32 handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
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33 else
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34 handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
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35 end
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36 elseif not inbound and not stanza.attr.to then
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37 handle_normal_presence(origin, stanza, core_route_stanza);
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38 else
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39 core_route_stanza(origin, stanza);
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40 end
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41 end
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42
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43 function handle_normal_presence(origin, stanza, core_route_stanza)
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44 if origin.roster then
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45 for jid in pairs(origin.roster) do -- broadcast to all interested contacts
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46 local subscription = origin.roster[jid].subscription;
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47 if subscription == "both" or subscription == "from" then
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48 stanza.attr.to = jid;
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49 core_route_stanza(origin, stanza);
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50 end
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51 end
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52 local node, host = jid_split(stanza.attr.from);
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53 for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources
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54 if res ~= origin and res.full_jid then -- to resource. FIXME is res.full_jid the correct check? Maybe it should be res.presence
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55 stanza.attr.to = res.full_jid;
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56 core_route_stanza(origin, stanza);
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57 end
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58 end
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59 if stanza.attr.type == nil and not origin.presence then -- initial presence
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60 local probe = st.presence({from = origin.full_jid, type = "probe"});
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61 for jid in pairs(origin.roster) do -- probe all contacts we are subscribed to
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62 local subscription = origin.roster[jid].subscription;
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63 if subscription == "both" or subscription == "to" then
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64 probe.attr.to = jid;
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65 core_route_stanza(origin, probe);
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66 end
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67 end
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68 for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast from all available resources
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69 if res ~= origin and res.presence then
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70 res.presence.attr.to = origin.full_jid;
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71 core_route_stanza(res, res.presence);
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72 res.presence.attr.to = nil;
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73 end
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74 end
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75 if origin.roster.pending then -- resend incoming subscription requests
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76 for jid in pairs(origin.roster.pending) do
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77 origin.send(st.presence({type="subscribe", from=jid})); -- TODO add to attribute? Use original?
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78 end
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79 end
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80 local request = st.presence({type="subscribe", from=origin.username.."@"..origin.host});
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81 for jid, item in pairs(origin.roster) do -- resend outgoing subscription requests
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82 if item.ask then
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83 request.attr.to = jid;
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84 core_route_stanza(origin, request);
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85 end
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86 end
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87 local offline = offlinemanager.load(node, host);
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88 if offline then
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89 for _, msg in ipairs(offline) do
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90 origin.send(msg); -- FIXME do we need to modify to/from in any way?
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91 end
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92 offlinemanager.deleteAll(node, host);
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93 end
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94 end
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95 origin.priority = 0;
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96 if stanza.attr.type == "unavailable" then
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97 origin.presence = nil;
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98 if origin.directed then
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99 local old_from = stanza.attr.from;
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100 stanza.attr.from = origin.full_jid;
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101 for jid in pairs(origin.directed) do
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102 stanza.attr.to = jid;
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103 core_route_stanza(origin, stanza);
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104 end
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105 stanza.attr.from = old_from;
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106 origin.directed = nil;
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107 end
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108 else
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109 origin.presence = stanza;
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110 local priority = stanza:child_with_name("priority");
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111 if priority and #priority > 0 then
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112 priority = t_concat(priority);
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113 if s_find(priority, "^[+-]?[0-9]+$") then
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114 priority = tonumber(priority);
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115 if priority < -128 then priority = -128 end
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116 if priority > 127 then priority = 127 end
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117 origin.priority = priority;
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118 end
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119 end
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120 end
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121 stanza.attr.to = nil; -- reset it
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122 else
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123 log("error", "presence recieved from client with no roster");
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124 end
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125 end
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126
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127 function send_presence_of_available_resources(user, host, jid, recipient_session, core_route_stanza)
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128 local h = hosts[host];
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129 local count = 0;
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130 if h and h.type == "local" then
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131 local u = h.sessions[user];
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132 if u then
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133 for k, session in pairs(u.sessions) do
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134 local pres = session.presence;
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135 if pres then
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136 pres.attr.to = jid;
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137 pres.attr.from = session.full_jid;
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138 core_route_stanza(session, pres);
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139 pres.attr.to = nil;
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140 pres.attr.from = nil;
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141 count = count + 1;
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142 end
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143 end
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144 end
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145 end
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146 log("info", "broadcasted presence of "..count.." resources from "..user.."@"..host.." to "..jid);
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147 return count;
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148 end
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149
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150 function handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza)
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151 local node, host = jid_split(from_bare);
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152 local st_from, st_to = stanza.attr.from, stanza.attr.to;
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153 stanza.attr.from, stanza.attr.to = from_bare, to_bare;
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154 log("debug", "outbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
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155 if stanza.attr.type == "subscribe" then
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156 -- 1. route stanza
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157 -- 2. roster push (subscription = none, ask = subscribe)
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158 if rostermanager.set_contact_pending_out(node, host, to_bare) then
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159 rostermanager.roster_push(node, host, to_bare);
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160 end -- else file error
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161 core_route_stanza(origin, stanza);
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162 elseif stanza.attr.type == "unsubscribe" then
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163 -- 1. route stanza
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164 -- 2. roster push (subscription = none or from)
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165 if rostermanager.unsubscribe(node, host, to_bare) then
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166 rostermanager.roster_push(node, host, to_bare); -- FIXME do roster push when roster has in fact not changed?
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167 end -- else file error
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168 core_route_stanza(origin, stanza);
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169 elseif stanza.attr.type == "subscribed" then
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170 -- 1. route stanza
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171 -- 2. roster_push ()
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172 -- 3. send_presence_of_available_resources
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173 if rostermanager.subscribed(node, host, to_bare) then
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174 rostermanager.roster_push(node, host, to_bare);
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175 end
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176 core_route_stanza(origin, stanza);
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177 send_presence_of_available_resources(node, host, to_bare, origin, core_route_stanza);
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178 elseif stanza.attr.type == "unsubscribed" then
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179 -- 1. route stanza
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180 -- 2. roster push (subscription = none or to)
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181 if rostermanager.unsubscribed(node, host, to_bare) then
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182 rostermanager.roster_push(node, host, to_bare);
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183 end
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184 core_route_stanza(origin, stanza);
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185 end
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186 stanza.attr.from, stanza.attr.to = st_from, st_to;
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187 end
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188
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189 function handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza)
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190 local node, host = jid_split(to_bare);
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191 local st_from, st_to = stanza.attr.from, stanza.attr.to;
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192 stanza.attr.from, stanza.attr.to = from_bare, to_bare;
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193 log("debug", "inbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
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194 if stanza.attr.type == "probe" then
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195 if rostermanager.is_contact_subscribed(node, host, from_bare) then
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196 if 0 == send_presence_of_available_resources(node, host, from_bare, origin, core_route_stanza) then
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197 -- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too)
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198 end
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199 else
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200 core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="unsubscribed"}));
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201 end
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202 elseif stanza.attr.type == "subscribe" then
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203 if rostermanager.is_contact_subscribed(node, host, from_bare) then
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204 core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="subscribed"})); -- already subscribed
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205 -- Sending presence is not clearly stated in the RFC, but it seems appropriate
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206 if 0 == send_presence_of_available_resources(node, host, from_bare, origin, core_route_stanza) then
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207 -- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too)
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208 end
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209 else
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210 if not rostermanager.is_contact_pending_in(node, host, from_bare) then
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211 if rostermanager.set_contact_pending_in(node, host, from_bare) then
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212 sessionmanager.send_to_available_resources(node, host, stanza);
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213 end -- TODO else return error, unable to save
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214 end
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215 end
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216 elseif stanza.attr.type == "unsubscribe" then
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217 if rostermanager.process_inbound_unsubscribe(node, host, from_bare) then
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218 rostermanager.roster_push(node, host, from_bare);
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219 end
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220 elseif stanza.attr.type == "subscribed" then
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221 if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then
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222 rostermanager.roster_push(node, host, from_bare);
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223 end
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224 elseif stanza.attr.type == "unsubscribed" then
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225 if rostermanager.process_inbound_subscription_cancellation(node, host, from_bare) then
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226 rostermanager.roster_push(node, host, from_bare);
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227 end
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228 end -- discard any other type
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229 stanza.attr.from, stanza.attr.to = st_from, st_to;
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230 end
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231
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232 local function presence_handler(data)
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233 local origin, stanza = data.origin, data.stanza;
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234 local to = stanza.attr.to;
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235 local node, host = jid_split(to);
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236 local to_bare = jid_bare(to);
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237 local from_bare = jid_bare(stanza.attr.from);
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238 if origin.type == "c2s" then
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239 if to ~= nil and not(origin.roster[to_bare] and (origin.roster[to_bare].subscription == "both" or origin.roster[to_bare].subscription == "from")) then -- directed presence
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240 origin.directed = origin.directed or {};
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241 origin.directed[to] = true;
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242 end
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243 if to == nil and stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" and stanza.attr.type ~= "error" then
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244 handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
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245 elseif not to then
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246 handle_normal_presence(origin, stanza);
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247 else
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248 core_route_stanza(origin, stanza);
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249 end
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250 elseif (origin.type == "s2sin" or origin.type == "component") and hosts[host] then
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251 if to == nil and stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" and stanza.attr.type ~= "error" then
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252 handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
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253 else
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254 core_route_stanza(origin, stanza);
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255 end
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256 end
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257 end
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258
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259 local add_handler = require "core.eventmanager2".add_handler;
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260 local remove_handler = require "core.eventmanager2".remove_handler;
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261
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262 add_handler(module:get_host().."/presence", presence_handler);
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263 module.unload = function()
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264 remove_handler(module:get_host().."/presence", presence_handler);
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265 end
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266
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267 return _M;
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