prosody
a3d77353c18a
plugins/mod_component.lua

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plugins/mod_component.lua @ 1042:a3d77353c18a

mod_*: Fix a load of global accesses
author Matthew Wild <mwild1@gmail.com>
date Wed, 22 Apr 2009 21:32:23 +0100
parent 981:71fce47dff7b
child 1108:368754c54045
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902
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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 if module:get_host_type() ~= "component" then
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10 error("Don't load mod_component manually, it should be for a component, please see http://prosody.im/doc/components", 0);
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11 end
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12
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13 local hosts = _G.hosts;
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14
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15 local t_concat = table.concat;
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16
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17 local lxp = require "lxp";
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18 local logger = require "util.logger";
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19 local config = require "core.configmanager";
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20 local connlisteners = require "net.connlisteners";
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21 local cm_register_component = require "core.componentmanager".register_component;
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22 local cm_deregister_component = require "core.componentmanager".deregister_component;
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23 local uuid_gen = require "util.uuid".generate;
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24 local sha1 = require "util.hashes".sha1;
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25 local st = require "util.stanza";
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26 local init_xmlhandlers = require "core.xmlhandlers";
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27
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28 local sessions = {};
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29
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30 local log = module._log;
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31
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32 local component_listener = { default_port = 5347; default_mode = "*a"; default_interface = config.get("*", "core", "component_interface") or "127.0.0.1" };
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33
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34 local xmlns_component = 'jabber:component:accept';
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35
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36 --- Callbacks/data for xmlhandlers to handle streams for us ---
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37
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38 local stream_callbacks = { stream_tag = "http://etherx.jabber.org/streams|stream", default_ns = xmlns_component };
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39
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40 function stream_callbacks.error(session, error, data, data2)
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41 log("warn", "Error processing component stream: "..tostring(error));
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42 if error == "no-stream" then
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43 session:close("invalid-namespace");
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44 elseif error == "xml-parse-error" and data == "unexpected-element-close" then
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45 session.log("debug", "Unexpected close of '%s' tag", data2);
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46 session:close("xml-not-well-formed");
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47 else
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48 session.log("debug", "External component %s XML parse error: %s", tostring(session.host), tostring(error));
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49 print(data, debug.traceback())
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50 session:close("xml-not-well-formed");
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51 end
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52 end
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53
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54 function stream_callbacks.streamopened(session, attr)
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55 if config.get(attr.to, "core", "component_module") ~= "component" then
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56 -- Trying to act as a component domain which
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57 -- hasn't been configured
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58 session:close{ condition = "host-unknown", text = tostring(attr.to).." does not match any configured external components" };
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59 return;
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60 end
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61
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62 -- Store the original host (this is used for config, etc.)
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63 session.user = attr.to;
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64 -- Set the host for future reference
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65 session.host = config.get(attr.to, "core", "component_address") or attr.to;
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66 -- Note that we don't create the internal component
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67 -- until after the external component auths successfully
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68
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69 session.streamid = uuid_gen();
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70 session.notopen = nil;
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71
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72 session.send(st.stanza("stream:stream", { xmlns=xmlns_component,
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73 ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.host }):top_tag());
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74
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75 end
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76
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77 function stream_callbacks.streamclosed(session)
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78 session.send("</stream:stream>");
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79 session.notopen = true;
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80 end
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81
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82 local core_process_stanza = core_process_stanza;
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83
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84 function stream_callbacks.handlestanza(session, stanza)
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85 -- Namespaces are icky.
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86 log("warn", "Handing stanza with name %s", stanza.name);
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87 if stanza.name ~= "handshake" then
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88 return core_process_stanza(session, stanza);
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89 else
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90 handle_component_auth(session, stanza);
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91 end
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92 end
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93
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94 --- Handle authentication attempts by components
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95 function handle_component_auth(session, stanza)
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96 if (not session.host) or #stanza.tags > 0 then
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97 session:close("not-authorized");
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98 return;
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99 end
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100
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101 local secret = config.get(session.user, "core", "component_secret");
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102 if not secret then
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103 log("warn", "Component attempted to identify as %s, but component_password is not set", session.user);
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104 session:close("not-authorized");
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105 return;
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106 end
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107
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108 local supplied_token = t_concat(stanza);
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109 local calculated_token = sha1(session.streamid..secret, true);
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110 if supplied_token:lower() ~= calculated_token:lower() then
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111 session:close{ condition = "not-authorized", text = "Given token does not match calculated token" };
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112 return;
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113 end
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114
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115
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116 -- Authenticated now
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117
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118 -- If component not already created for this host, create one now
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119 if not hosts[session.host].connected then
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120 local send = session.send;
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121 session.component_session = cm_register_component(session.host, function (_, data) return send(data); end);
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122 hosts[session.host].connected = true;
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123 else
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124 log("error", "Multiple components bound to the same address, first one wins (TODO: Implement stanza distribution)");
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125 end
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126
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127 -- Signal successful authentication
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128 session.send(st.stanza("handshake"));
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129 end
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130
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131 module:add_handler("component", "handshake", xmlns_component, handle_component_auth);
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132
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133 --- Closing a component connection
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134 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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135 local function session_close(session, reason)
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136 local log = session.log or log;
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137 if session.conn then
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138 if reason then
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139 if type(reason) == "string" then -- assume stream error
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140 log("info", "Disconnecting component, <stream:error> is: %s", reason);
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141 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
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142 elseif type(reason) == "table" then
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143 if reason.condition then
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144 local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
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145 if reason.text then
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146 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
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147 end
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148 if reason.extra then
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149 stanza:add_child(reason.extra);
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150 end
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151 log("info", "Disconnecting component, <stream:error> is: %s", tostring(stanza));
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152 session.send(stanza);
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153 elseif reason.name then -- a stanza
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154 log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason));
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155 session.send(reason);
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156 end
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157 end
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158 end
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159 session.send("</stream:stream>");
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160 session.conn.close();
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161 component_listener.disconnect(session.conn, "stream error");
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162 end
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163 end
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164
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165 --- Component connlistener
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166 function component_listener.listener(conn, data)
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167 local session = sessions[conn];
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168 if not session then
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169 local _send = conn.write;
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170 session = { type = "component", conn = conn, send = function (data) return _send(tostring(data)); end };
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171 sessions[conn] = session;
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172
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173 -- Logging functions --
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174
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175 local conn_name = "xep114-"..tostring(conn):match("[a-f0-9]+$");
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176 session.log = logger.init(conn_name);
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177 session.close = session_close;
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178
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179 session.log("info", "Incoming XEP-0114 connection");
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180
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181 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "|");
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182 session.parser = parser;
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183
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184 session.notopen = true;
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185
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186 function session.data(conn, data)
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187 local ok, err = parser:parse(data);
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188 if ok then return; end
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189 session:close("xml-not-well-formed");
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190 end
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191
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192 session.dispatch_stanza = stream_callbacks.handlestanza;
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193
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194 end
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195 if data then
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196 session.data(conn, data);
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197 end
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198 end
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199
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200 function component_listener.disconnect(conn, err)
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201 local session = sessions[conn];
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202 if session then
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203 (session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err));
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204 if session.host then
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205 log("debug", "deregistering component");
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206 cm_deregister_component(session.host);
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207 hosts[session.host].connected = nil;
902
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208 end
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209 sessions[conn] = nil;
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210 session = nil;
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211 collectgarbage("collect");
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212 end
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213 end
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214
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215 connlisteners.register('component', component_listener);
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216
910
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217 module:add_event_hook("server-started",
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218 function ()
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219 if _G.net_activate_ports then
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220 _G.net_activate_ports("component", "component", {5437}, "tcp");
910
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221 else
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222 error("No net_activate_ports: Using an incompatible version of Prosody?");
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223 end
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224 end);