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annotate mod_client_proxy/mod_client_proxy.lua @ 4617:260a33eabbd3

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mod_http_upload: More emphasis on conditionality of disco_items Seen too many that needlessly add duplicated disco_items.
author Kim Alvefur <zash@zash.se>
date Wed, 14 Jul 2021 19:46:12 +0200
parents a14a573d43ff
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 if module:get_host_type() ~= "component" then
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2 error("proxy_component should be loaded as component", 0);
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3 end
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4
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5 local jid_split = require "util.jid".split;
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6 local jid_bare = require "util.jid".bare;
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7 local jid_prep = require "util.jid".prep;
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8 local st = require "util.stanza";
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9 local array = require "util.array";
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10
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11 local target_address = module:get_option_string("target_address");
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12
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13 sessions = array{};
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14 local sessions = sessions;
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15
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16 local function handle_target_presence(stanza)
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17 local type = stanza.attr.type;
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18 module:log("debug", "received presence from destination: %s", type)
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19 local _, _, resource = jid_split(stanza.attr.from);
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20 if type == "error" then
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21 -- drop all known sessions
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22 for k in pairs(sessions) do
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23 sessions[k] = nil
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24 end
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25 module:log(
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26 "debug",
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27 "received error presence, dropping all target sessions",
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28 resource
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29 )
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30 elseif type == "unavailable" then
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31 for k in pairs(sessions) do
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32 if sessions[k] == resource then
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33 sessions[k] = nil
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34 module:log(
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35 "debug",
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36 "dropped target session: %s",
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37 resource
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38 )
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39 break
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40 end
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41 end
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42 elseif not type then
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43 -- available
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44 local found = false;
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45 for k in pairs(sessions) do
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46 if sessions[k] == resource then
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47 found = true;
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48 break
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49 end
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50 end
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51 if not found then
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52 module:log(
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53 "debug",
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54 "registered new target session: %s",
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55 resource
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56 )
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57 sessions:push(resource)
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58 end
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59 end
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60 end
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61
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62 local function handle_from_target(stanza)
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63 local type = stanza.attr.type
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64 module:log(
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65 "debug",
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66 "non-presence stanza from target: name = %s, type = %s",
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67 stanza.name,
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68 type
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69 )
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70 if stanza.name == "iq" then
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71 if type == "error" or type == "result" then
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72 -- de-NAT message
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73 local _, _, denatted_to_unprepped = jid_split(stanza.attr.to);
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74 local denatted_to = jid_prep(denatted_to_unprepped);
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75 if not denatted_to then
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76 module:log(
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77 "debug",
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78 "cannot de-NAT stanza, invalid to: %s",
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79 denatted_to_unprepped
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80 )
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81 return
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82 end
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83 local denatted_from = module:get_host();
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84
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85 module:log(
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86 "debug",
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87 "de-NAT-ed stanza: from: %s -> %s, to: %s -> %s",
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88 stanza.attr.from,
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89 denatted_from,
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90 stanza.attr.to,
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91 denatted_to
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92 )
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93
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94 stanza.attr.from = denatted_from
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95 stanza.attr.to = denatted_to
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96
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97 module:send(stanza)
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98 else
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99 -- FIXME: we don’t support NATing outbund requests atm.
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100 module:send(st.error_reply(stanza, "cancel", "feature-not-implemented"))
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101 end
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102 elseif stanza.name == "message" then
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103 -- not implemented yet, we need a way to ensure that routing doesn’t
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104 -- break
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105 module:send(st.error_reply(stanza, "cancel", "feature-not-implemented"))
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106 end
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107 end
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108
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109 local function handle_to_target(stanza)
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110 local type = stanza.attr.type;
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111 module:log(
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112 "debug",
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113 "stanza to target: name = %s, type = %s",
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114 stanza.name, type
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115 )
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116 if stanza.name == "presence" then
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117 if type ~= "error" then
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118 module:send(st.error_reply(stanza, "cancel", "bad-request"))
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119 return
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120 end
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121 elseif stanza.name == "iq" then
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122 if type == "get" or type == "set" then
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123 if #sessions == 0 then
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124 -- no sessions available to send to
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125 module:log("debug", "no sessions to send to!")
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126 module:send(st.error_reply(stanza, "cancel", "service-unavailable"))
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127 return
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128 end
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129
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130 -- find a target session
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131 local target_session = sessions:random()
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132 local target = target_address .. "/" .. target_session
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133
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134 -- encode sender JID in resource
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135 local natted_from = module:get_host() .. "/" .. stanza.attr.from;
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136
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137 module:log(
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138 "debug",
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139 "NAT-ed stanza: from: %s -> %s, to: %s -> %s",
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140 stanza.attr.from,
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141 natted_from,
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142 stanza.attr.to,
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143 target
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144 )
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145
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146 stanza.attr.from = natted_from
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147 stanza.attr.to = target
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148
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149 module:send(stanza)
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150 end
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151 -- FIXME: handle and forward result/error correctly
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152 elseif stanza.name == "message" then
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153 -- not implemented yet, we need a way to ensure that routing doesn’t
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154 -- break
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155 module:send(st.error_reply(stanza, "cancel", "feature-not-implemented"))
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156 end
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157 end
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158
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159 local function stanza_handler(event)
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160 local origin, stanza = event.origin, event.stanza
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161 module:log("debug", "received stanza from %s session", origin.type)
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162
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163 local bare_from = jid_bare(stanza.attr.from);
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164 local _, _, to = jid_split(stanza.attr.to);
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165 if bare_from == target_address then
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166 -- from our target, to whom?
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167 if not to then
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168 -- directly to component
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169 if stanza.name == "presence" then
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170 handle_target_presence(stanza)
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171 else
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172 module:send(st.error_reply(stanza, "cancel", "bad-request"))
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173 return true
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174 end
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175 else
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176 -- to someone else
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177 handle_from_target(stanza)
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178 end
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179 else
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180 handle_to_target(stanza)
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181 end
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182 return true
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183 end
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184
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185 module:hook("iq/bare", stanza_handler, -1);
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186 module:hook("message/bare", stanza_handler, -1);
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187 module:hook("presence/bare", stanza_handler, -1);
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188 module:hook("iq/full", stanza_handler, -1);
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189 module:hook("message/full", stanza_handler, -1);
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190 module:hook("presence/full", stanza_handler, -1);
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191 module:hook("iq/host", stanza_handler, -1);
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192 module:hook("message/host", stanza_handler, -1);
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193 module:hook("presence/host", stanza_handler, -1);
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194
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195 module:log("debug", "loaded proxy on %s", module:get_host())
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196
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197 subscription_request = st.presence({
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198 type = "subscribe",
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199 to = target_address,
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200 from = module:get_host()}
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201 )
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202 module:send(subscription_request)