prosody
77a1778b16e8
core/stanza_router.lua

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core/stanza_router.lua @ 128:77a1778b16e8

Set things up for presence subscriptions. Remove reference to core.s2smanager.
author Waqas Hussain <waqas20@gmail.com>
date Thu, 23 Oct 2008 18:36:10 +0500
parent 121:74e5919e4737
child 130:907cff6b5359
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1
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2 -- The code in this file should be self-explanatory, though the logic is horrible
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3 -- for more info on that, see doc/stanza_routing.txt, which attempts to condense
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4 -- the rules from the RFCs (mainly 3921)
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5
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6 require "core.servermanager"
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7
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8 local log = require "util.logger".init("stanzarouter")
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9
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10 local st = require "util.stanza";
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11 local send = require "core.sessionmanager".send_to_session;
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12 local user_exists = require "core.usermanager".user_exists;
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13
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14 local jid_split = require "util.jid".split;
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15 local print = print;
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17 function core_process_stanza(origin, stanza)
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18 log("debug", "Received: "..tostring(stanza))
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19 -- TODO verify validity of stanza (as well as JID validity)
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20 if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then
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21 if stanza.attr.type == "set" or stanza.attr.type == "get" then
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22 error("Invalid IQ");
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23 elseif #stanza.tags > 1 or not(stanza.attr.type == "error" or stanza.attr.type == "result") then
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24 error("Invalid IQ");
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25 end
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26 end
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28 if origin.type == "c2s" and not origin.full_jid
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29 and not(stanza.name == "iq" and stanza.tags[1].name == "bind"
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30 and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
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31 error("Client MUST bind resource after auth");
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32 end
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33
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34 local to = stanza.attr.to;
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35 stanza.attr.from = origin.full_jid; -- quick fix to prevent impersonation (FIXME this would be incorrect when the origin is not c2s)
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36 -- TODO also, stazas should be returned to their original state before the function ends
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37
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38 -- TODO presence subscriptions
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39 if not to then
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40 core_handle_stanza(origin, stanza);
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41 elseif hosts[to] and hosts[to].type == "local" then
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42 core_handle_stanza(origin, stanza);
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43 elseif stanza.name == "iq" and not select(3, jid_split(to)) then
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44 core_handle_stanza(origin, stanza);
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45 elseif origin.type == "c2s" then
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46 core_route_stanza(origin, stanza);
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47 end
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48 end
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49
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50 -- This function handles stanzas which are not routed any further,
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51 -- that is, they are handled by this server
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52 function core_handle_stanza(origin, stanza)
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53 -- Handlers
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54 if origin.type == "c2s" or origin.type == "c2s_unauthed" then
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55 local session = origin;
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56
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57 if stanza.name == "presence" and origin.roster then
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58 if stanza.attr.type == nil or stanza.attr.type == "available" or stanza.attr.type == "unavailable" then
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59 for jid in pairs(origin.roster) do -- broadcast to all interested contacts
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60 local subscription = origin.roster[jid].subscription;
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61 if subscription == "both" or subscription == "from" then
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62 stanza.attr.to = jid;
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63 core_route_stanza(origin, stanza);
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64 end
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65 end
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66 --[[local node, host = jid_split(stanza.attr.from);
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67 for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources
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68 if res.full_jid then
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69 res = user.sessions[k];
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70 break;
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71 end
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72 end]]
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73 if not origin.presence then -- presence probes on initial presence
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74 local probe = st.presence({from = origin.full_jid, type = "probe"});
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75 for jid in pairs(origin.roster) do
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76 local subscription = origin.roster[jid].subscription;
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77 if subscription == "both" or subscription == "to" then
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78 probe.attr.to = jid;
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79 core_route_stanza(origin, probe);
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80 end
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81 end
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82 end
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83 origin.presence = stanza;
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84 stanza.attr.to = nil; -- reset it
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85 else
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86 -- TODO error, bad type
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87 end
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88 else
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89 log("debug", "Routing stanza to local");
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90 handle_stanza(session, stanza);
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91 end
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92 end
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93 end
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94
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95 function is_authorized_to_see_presence(origin, username, host)
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96 local roster = datamanager.load(username, host, "roster") or {};
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97 local item = roster[origin.username.."@"..origin.host];
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98 return item and (item.subscription == "both" or item.subscription == "from");
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99 end
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100
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101 function core_route_stanza(origin, stanza)
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102 -- Hooks
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103 --- ...later
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104
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105 -- Deliver
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106 local to = stanza.attr.to;
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107 local node, host, resource = jid_split(to);
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108
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109 if stanza.name == "presence" and stanza.attr.type == "probe" then resource = nil; end
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110
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111 local host_session = hosts[host]
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112 if host_session and host_session.type == "local" then
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113 -- Local host
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114 local user = host_session.sessions[node];
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115 if user then
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116 local res = user.sessions[resource];
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117 if not res then
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118 -- if we get here, resource was not specified or was unavailable
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119 if stanza.name == "presence" then
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120 if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
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121 if stanza.attr.type == "probe" then
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122 if is_authorized_to_see_presence(origin, node, host) then
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123 for k in pairs(user.sessions) do -- return presence for all resources
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124 if user.sessions[k].presence then
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125 local pres = user.sessions[k].presence;
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126 pres.attr.to = origin.full_jid;
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127 pres.attr.from = user.sessions[k].full_jid;
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128 send(origin, pres);
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129 pres.attr.to = nil;
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130 pres.attr.from = nil;
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131 end
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132 end
128
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133 else
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134 send(origin, st.presence({from=user.."@"..host, to=origin.username.."@"..origin.host, type="unsubscribed"}));
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135 end
128
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136 elseif stanza.attr.type == "subscribe" then
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137 -- TODO
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138 elseif stanza.attr.type == "unsubscribe" then
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139 -- TODO
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140 elseif stanza.attr.type == "subscribed" then
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141 -- TODO
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142 elseif stanza.attr.type == "unsubscribed" then
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143 -- TODO
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144 end -- discard any other type
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145 else -- sender is available or unavailable
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146 for k in pairs(user.sessions) do -- presence broadcast to all user resources
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147 if user.sessions[k].full_jid then
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148 stanza.attr.to = user.sessions[k].full_jid;
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149 send(user.sessions[k], stanza);
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150 end
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151 end
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152 end
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153 elseif stanza.name == "message" then -- select a resource to recieve message
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154 for k in pairs(user.sessions) do
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155 if user.sessions[k].full_jid then
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156 res = user.sessions[k];
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157 break;
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158 end
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159 end
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160 -- TODO find resource with greatest priority
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161 send(res, stanza);
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162 else
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163 -- TODO send IQ error
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164 end
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165 else
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166 -- User + resource is online...
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167 stanza.attr.to = res.full_jid;
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168 send(res, stanza); -- Yay \o/
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169 end
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170 else
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171 -- user not online
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172 if user_exists(node, host) then
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173 if stanza.name == "presence" then
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174 if stanza.attr.type == "probe" and is_authorized_to_see_presence(origin, node, host) then -- FIXME what to do for not c2s?
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175 -- TODO send last recieved unavailable presence
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176 else
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177 -- TODO send unavailable presence
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178 end
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179 elseif stanza.name == "message" then
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180 -- TODO send message error, or store offline messages
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181 elseif stanza.name == "iq" then
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182 -- TODO send IQ error
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183 end
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184 else -- user does not exist
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185 -- TODO we would get here for nodeless JIDs too. Do something fun maybe? Echo service? Let plugins use xmpp:server/resource addresses?
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186 if stanza.name == "presence" then
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187 if stanza.attr.type == "probe" then
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188 send(origin, st.presence({from = user.."@"..host, to = origin.username.."@"..origin.host, type = "unsubscribed"}));
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189 end
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190 -- else ignore
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191 else
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192 send(origin, st.error_reply(stanza, "cancel", "service-unavailable"));
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193 end
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194 end
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195 end
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196 else
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197 -- Remote host
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198 if host_session then
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199 -- Send to session
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200 else
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201 -- Need to establish the connection
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202 end
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203 end
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204 stanza.attr.to = to; -- reset
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205 end
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206
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207 function handle_stanza_toremote(stanza)
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208 log("error", "Stanza bound for remote host, but s2s is not implemented");
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209 end