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annotate mod_client_proxy/mod_client_proxy.lua @ 3098:a81456a13797

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mod_client_proxy: a Jabber Address Translation implementation
author Jonas Wielicki <jonas@wielicki.name>
date Sun, 03 Jun 2018 13:55:10 +0200
parents
children a14a573d43ff
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rev   line source
3098
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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 comp_host = module:get_host();
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6 local comp_name = module:get_option_string("name", "Proxy Component");
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7
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8 local jid_split = require "util.jid".split;
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9 local jid_bare = require "util.jid".bare;
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10 local jid_prep = require "util.jid".prep;
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11 local st = require "util.stanza";
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12 local array = require "util.array";
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13
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14 local target_address = module:get_option_string("target_address");
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15
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16 local hosts = prosody.hosts;
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17
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18 sessions = array{};
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19 local sessions = sessions;
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20
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21 local function handle_target_presence(origin, stanza)
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22 local type = stanza.attr.type;
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23 module:log("debug", "received presence from destination: %s", type)
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24 local _, _, resource = jid_split(stanza.attr.from);
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25 if type == "error" then
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26 -- drop all known sessions
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27 for k in pairs(sessions) do
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28 sessions[k] = nil
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29 end
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30 module:log(
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31 "debug",
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32 "received error presence, dropping all target sessions",
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33 resource
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34 )
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35 elseif type == "unavailable" then
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36 for k in pairs(sessions) do
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37 if sessions[k] == resource then
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38 sessions[k] = nil
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39 module:log(
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40 "debug",
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41 "dropped target session: %s",
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42 resource
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43 )
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44 break
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45 end
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46 end
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47 elseif not type then
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48 -- available
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49 local found = false;
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50 for k in pairs(sessions) do
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51 if sessions[k] == resource then
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52 found = true;
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53 break
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54 end
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55 end
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56 if not found then
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57 module:log(
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58 "debug",
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59 "registered new target session: %s",
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60 resource
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61 )
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62 sessions:push(resource)
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63 end
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64 end
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65 end
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66
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67 local function handle_from_target(origin, stanza)
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68 local type = stanza.attr.type
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69 module:log(
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70 "debug",
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71 "non-presence stanza from target: name = %s, type = %s",
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72 stanza.name,
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73 type
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74 )
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75 if stanza.name == "iq" then
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76 if type == "error" or type == "result" then
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77 -- de-NAT message
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78 local _, _, denatted_to_unprepped = jid_split(stanza.attr.to);
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79 local denatted_to = jid_prep(denatted_to_unprepped);
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80 if not denatted_to then
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81 module:log(
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82 "debug",
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83 "cannot de-NAT stanza, invalid to: %s",
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84 denatted_to_unprepped
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85 )
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86 return
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87 end
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88 local denatted_from = module:get_host();
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89
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90 module:log(
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91 "debug",
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92 "de-NAT-ed stanza: from: %s -> %s, to: %s -> %s",
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93 stanza.attr.from,
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94 denatted_from,
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95 stanza.attr.to,
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96 denatted_to
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97 )
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98
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99 stanza.attr.from = denatted_from
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100 stanza.attr.to = denatted_to
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101
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102 module:send(stanza)
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103 else
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104 -- FIXME: we don’t support NATing outbund requests atm.
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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 elseif stanza.name == "message" then
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108 -- not implemented yet, we need a way to ensure that routing doesn’t
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109 -- break
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110 module:send(st.error_reply(stanza, "cancel", "feature-not-implemented"))
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111 end
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112 end
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113
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114 local function handle_to_target(origin, stanza)
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115 local type = stanza.attr.type;
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116 module:log(
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117 "debug",
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118 "stanza to target: name = %s, type = %s",
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119 stanza.name, type
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120 )
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121 if stanza.name == "presence" then
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122 if type ~= "error" then
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123 module:send(st.error_reply(stanza, "cancel", "bad-request"))
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124 return
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125 end
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126 elseif stanza.name == "iq" then
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127 if type == "get" or type == "set" then
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128 if #sessions == 0 then
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129 -- no sessions available to send to
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130 module:log("debug", "no sessions to send to!")
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131 module:send(st.error_reply(stanza, "cancel", "service-unavailable"))
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132 return
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133 end
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134
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135 -- find a target session
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136 local target_session = sessions:random()
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137 local target = target_address .. "/" .. target_session
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138
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139 -- encode sender JID in resource
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140 local natted_from = module:get_host() .. "/" .. stanza.attr.from;
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141
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142 module:log(
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143 "debug",
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144 "NAT-ed stanza: from: %s -> %s, to: %s -> %s",
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145 stanza.attr.from,
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146 natted_from,
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147 stanza.attr.to,
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148 target
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149 )
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150
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151 stanza.attr.from = natted_from
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152 stanza.attr.to = target
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153
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154 module:send(stanza)
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155 else
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156 -- FIXME: handle and forward result/error correctly
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157 end
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158 elseif stanza.name == "message" then
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159 -- not implemented yet, we need a way to ensure that routing doesn’t
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160 -- break
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161 module:send(st.error_reply(stanza, "cancel", "feature-not-implemented"))
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162 end
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163 end
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164
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165 local function stanza_handler(event)
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166 local origin, stanza = event.origin, event.stanza
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167 module:log("debug", "received stanza from %s session", origin.type)
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168
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169 local bare_from = jid_bare(stanza.attr.from);
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170 local _, _, to = jid_split(stanza.attr.to);
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171 if bare_from == target_address then
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172 -- from our target, to whom?
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173 if not to then
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174 -- directly to component
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175 if stanza.name == "presence" then
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176 handle_target_presence(origin, stanza)
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177 else
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178 module:send(st.error_reply(stanza, "cancel", "bad-request"))
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179 return true
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180 end
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181 else
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182 -- to someone else
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183 handle_from_target(origin, stanza)
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184 end
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185 else
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186 handle_to_target(origin, stanza)
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187 end
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188 return true
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189 end
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190
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191 module:hook("iq/bare", stanza_handler, -1);
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192 module:hook("message/bare", stanza_handler, -1);
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193 module:hook("presence/bare", stanza_handler, -1);
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194 module:hook("iq/full", stanza_handler, -1);
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195 module:hook("message/full", stanza_handler, -1);
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196 module:hook("presence/full", stanza_handler, -1);
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197 module:hook("iq/host", stanza_handler, -1);
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198 module:hook("message/host", stanza_handler, -1);
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199 module:hook("presence/host", stanza_handler, -1);
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200
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201 module:log("debug", "loaded proxy on %s", module:get_host())
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202
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203 subscription_request = st.presence({
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204 type = "subscribe",
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205 to = target_address,
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206 from = module:get_host()}
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207 )
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208 module:send(subscription_request)