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annotate mod_component_client/mod_component_client.lua @ 1804:3228fb928a93

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mod_mam/README: Minor fixup
author Kim Alvefur <zash@zash.se>
date Sun, 30 Aug 2015 03:05:53 +0200
parents 7dbde05b48a9
children 3e00cd4a02bc
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1 --[[
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2
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3 mod_component_client.lua
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5 This module turns Prosody hosts into components of other XMPP servers.
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6
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7 Config:
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8
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9 VirtualHost "component.example.com"
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10 component_client = {
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11 host = "localhost";
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12 port = 5347;
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13 secret = "hunter2";
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14 }
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17 ]]
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20 local socket = require "socket"
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22 local logger = require "util.logger";
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23 local sha1 = require "util.hashes".sha1;
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24 local st = require "util.stanza";
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26 local jid_split = require "util.jid".split;
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27 local new_xmpp_stream = require "util.xmppstream".new;
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28 local uuid_gen = require "util.uuid".generate;
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30 local core_process_stanza = prosody.core_process_stanza;
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31 local hosts = prosody.hosts;
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32
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33 local log = module._log;
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34
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35 local config = module:get_option("component_client", {});
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36 local server_host = config.host or "localhost";
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37 local server_port = config.port or 5347;
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38 local server_secret = config.secret or error("client_component.secret not provided");
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39 local exit_on_disconnect = config.exit_on_disconnect;
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40 local keepalive_interval = config.keepalive_interval or 3600;
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42 local __conn;
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44 local listener = {};
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45 local session;
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46
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47 local xmlns_component = 'jabber:component:accept';
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48 local stream_callbacks = { default_ns = xmlns_component };
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49
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50 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
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51
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52 function stream_callbacks.error(session, error, data, data2)
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53 if session.destroyed then return; end
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54 module:log("warn", "Error processing component stream: %s", tostring(error));
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55 if error == "no-stream" then
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56 session:close("invalid-namespace");
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57 elseif error == "parse-error" then
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58 session.log("warn", "External component %s XML parse error: %s", tostring(session.host), tostring(data));
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59 session:close("not-well-formed");
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60 elseif error == "stream-error" then
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61 local condition, text = "undefined-condition";
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62 for child in data:children() do
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63 if child.attr.xmlns == xmlns_xmpp_streams then
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64 if child.name ~= "text" then
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65 condition = child.name;
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66 else
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67 text = child:get_text();
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68 end
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69 if condition ~= "undefined-condition" and text then
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70 break;
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71 end
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72 end
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73 end
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74 text = condition .. (text and (" ("..text..")") or "");
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75 session.log("info", "Session closed by remote with error: %s", text);
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76 session:close(nil, text);
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77 end
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78 end
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79
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80 function stream_callbacks.streamopened(session, attr)
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81 -- TODO check id~=nil, from==module.host
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82 module:log("debug", "Sending handshake");
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83 local handshake = st.stanza("handshake"):text(sha1(attr.id..server_secret, true));
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84 session.send(handshake);
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85 session.notopen = nil;
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86 end
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87
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88 function stream_callbacks.streamclosed(session)
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89 session.log("debug", "Received </stream:stream>");
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90 session:close();
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91 end
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92
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93 module:hook("stanza/jabber:component:accept:handshake", function(event)
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94 session.type = "component";
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95 module:log("debug", "Handshake complete");
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96 module:fire_event("component_client/connected", {});
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97 return true; -- READY!
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98 end);
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99
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100 module:hook("route/remote", function(event)
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101 return session and session.send(event.stanza);
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102 end);
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103
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104 function stream_callbacks.handlestanza(session, stanza)
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105 -- Namespaces are icky.
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106 if not stanza.attr.xmlns and stanza.name == "handshake" then
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107 stanza.attr.xmlns = xmlns_component;
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108 end
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109 if not stanza.attr.xmlns or stanza.attr.xmlns == "jabber:client" then
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110 if not stanza.attr.from then
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111 session.log("warn", "Rejecting stanza with no 'from' address");
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112 session.send(st.error_reply(stanza, "modify", "bad-request", "Components MUST get a 'from' address on stanzas"));
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113 return;
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114 end
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115 local _, domain = jid_split(stanza.attr.to);
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116 if not domain then
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117 session.log("warn", "Rejecting stanza with no 'to' address");
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118 session.send(st.error_reply(stanza, "modify", "bad-request", "Components MUST get a 'to' address on stanzas"));
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119 return;
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120 elseif domain ~= session.host then
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121 session.log("warn", "Component received stanza with unknown 'to' address");
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122 session.send(st.error_reply(stanza, "cancel", "not-allowed", "Component doesn't serve this JID"));
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123 return;
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124 end
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125 end
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126 return core_process_stanza(session, stanza);
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127 end
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128
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129 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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130 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
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131 local function session_close(session, reason)
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132 if session.destroyed then return; end
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133 if session.conn then
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134 if session.notopen then
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135 session.send("<?xml version='1.0'?>");
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136 session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
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137 end
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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 module: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 module: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 module: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 listener.ondisconnect(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 function listener.onconnect(conn)
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166 session = { type = "component_unauthed", conn = conn, send = function (data) return conn:write(tostring(data)); end, host = module.host };
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167
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168 -- Logging functions --
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169 local conn_name = "jcp"..tostring(session):match("[a-f0-9]+$");
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170 session.log = logger.init(conn_name);
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171 session.close = session_close;
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172
993
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173 session.log("info", "Outgoing Jabber component connection");
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174
993
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175 local stream = new_xmpp_stream(session, stream_callbacks);
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176 session.stream = stream;
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177
993
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178 function session.data(conn, data)
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179 local ok, err = stream:feed(data);
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180 if ok then return; end
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parents:
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181 module:log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
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182 session:close("not-well-formed");
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parents:
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183 end
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184
993
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185 session.dispatch_stanza = stream_callbacks.handlestanza;
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186
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187 session.notopen = true;
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188 session.send(st.stanza("stream:stream", {
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189 to = session.host;
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190 ["xmlns:stream"] = 'http://etherx.jabber.org/streams';
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191 xmlns = xmlns_component;
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parents:
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192 }):top_tag());
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diff changeset
193
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194 --sessions[conn] = session;
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195 end
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196 function listener.onincoming(conn, data)
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197 --local session = sessions[conn];
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198 session.data(conn, data);
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199 end
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parents:
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200 function listener.ondisconnect(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.on_destroy then session:on_destroy(err); end
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205 --sessions[conn] = nil;
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parents:
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206 for k in pairs(session) do
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parents:
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207 if k ~= "log" and k ~= "close" then
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parents:
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208 session[k] = nil;
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parents:
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209 end
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210 end
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parents:
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211 session.destroyed = true;
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212 session = nil;
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parents:
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213 end
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parents:
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214 __conn = nil;
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parents:
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215 module:log("error", "connection lost");
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parents: 993
diff changeset
216 module:fire_event("component_client/disconnected", { reason = err });
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parents: 1218
diff changeset
217 if exit_on_disconnect and not prosody.shutdown_reason then
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parents: 1208
diff changeset
218 prosody.shutdown("Shutdown by component_client disconnect");
fc39f78e2b36 mod_component_client: Added component_client.exit_on_disconnect config option
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219 end
993
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220 end
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221
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222 -- send whitespace keep-alive one an hour
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223 if keepalive_interval ~= 0 then
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224 module:add_timer(keepalive_interval, function()
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225 if __conn then
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226 __conn:write(" ");
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227 end
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228 return keepalive_interval;
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229 end);
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230 end
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231
993
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232 function connect()
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233 ------------------------
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234 -- Taken from net.http
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235 local conn = socket.tcp ( )
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236 conn:settimeout ( 10 )
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237 local ok, err = conn:connect ( server_host , server_port )
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238 if not ok and err ~= "timeout" then
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239 return nil, err;
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240 end
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241
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242 local handler , conn = server.wrapclient ( conn , server_host , server_port , listener , "*a")
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243 __conn = handler;
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244 ------------------------
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245 return true;
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246 end
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247 local s, err = connect();
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248 if not s then
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249 listener.ondisconnect(nil, err);
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250 end
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251
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252 module:hook_global("server-stopping", function(event)
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253 local reason = event.reason;
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254 if session then
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255 session:close{ condition = "system-shutdown", text = reason };
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256 end
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257 end, 1000);
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258