prosody-modules
b80b6947b079
mod_client_proxy/mod_client_proxy.lua

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mod_client_proxy/mod_client_proxy.lua @ 5472:b80b6947b079

mod_http_oauth2: Always show early errors to user Before having validated the client_id, communicating an error back to the client via redirect would make this an open redirect, so we may just as well skip past that logic, and especially the warning log message.
author Kim Alvefur <zash@zash.se>
date Thu, 18 May 2023 13:43:17 +0200
parent 3101:a14a573d43ff
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)