prosody
4ae3e81513f3
core/modulemanager.lua

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core/modulemanager.lua @ 615:4ae3e81513f3

0.1 -> 0.2
author Matthew Wild <mwild1@gmail.com>
date Wed, 10 Dec 2008 15:44:03 +0000
parent 608:3758af511ce8
child 637:30b8ad9f7b70
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615
4ae3e81513f3 0.1 -> 0.2
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diff changeset
1 -- Prosody IM v0.2
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2 -- Copyright (C) 2008 Matthew Wild
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3 -- Copyright (C) 2008 Waqas Hussain
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4 --
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5 -- This program is free software; you can redistribute it and/or
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6 -- modify it under the terms of the GNU General Public License
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7 -- as published by the Free Software Foundation; either version 2
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8 -- of the License, or (at your option) any later version.
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9 --
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10 -- This program is distributed in the hope that it will be useful,
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11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 -- GNU General Public License for more details.
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14 --
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15 -- You should have received a copy of the GNU General Public License
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16 -- along with this program; if not, write to the Free Software
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17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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18 --
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19
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20
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21
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22 local plugin_dir = CFG_PLUGINDIR or "./plugins/";
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23
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24 local logger = require "util.logger";
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25 local log = logger.init("modulemanager");
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26 local addDiscoInfoHandler = require "core.discomanager".addDiscoInfoHandler;
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27 local eventmanager = require "core.eventmanager";
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28 local config = require "core.configmanager";
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29 local multitable_new = require "util.multitable".new;
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32 local loadfile, pcall = loadfile, pcall;
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33 local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv;
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34 local pairs, ipairs = pairs, ipairs;
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35 local t_insert = table.insert;
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36 local type = type;
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37
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38 local tostring, print = tostring, print;
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39
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40 -- We need this to let modules access the real global namespace
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41 local _G = _G;
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42
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43 module "modulemanager"
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44
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45 local api = {}; -- Module API container
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46
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47 local modulemap = { ["*"] = {} };
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48
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49 local stanza_handlers = multitable_new();
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50 local handler_info = {};
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51
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52 local modulehelpers = setmetatable({}, { __index = _G });
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53
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54 -- Load modules when a host is activated
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55 function load_modules_for_host(host)
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56 local modules_enabled = config.get(host, "core", "modules_enabled");
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57 if modules_enabled then
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58 for _, module in pairs(modules_enabled) do
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59 load(host, module);
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60 end
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61 end
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62 end
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63 eventmanager.add_event_hook("host-activated", load_modules_for_host);
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64 --
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66 function load(host, module_name, config)
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67 if not (host and module_name) then
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68 return nil, "insufficient-parameters";
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69 end
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71 if not modulemap[host] then
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72 modulemap[host] = {};
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73 elseif modulemap[host][module_name] then
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74 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
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75 return nil, "module-already-loaded";
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76 elseif modulemap["*"][module_name] then
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77 return nil, "global-module-already-loaded";
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78 end
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79
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80
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81 local mod, err = loadfile(plugin_dir.."mod_"..module_name..".lua");
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82 if not mod then
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83 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
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84 return nil, err;
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85 end
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86
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87 local _log = logger.init(host..":"..module_name);
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88 local api_instance = setmetatable({ name = module_name, host = host, config = config, _log = _log, log = function (self, ...) return _log(...); end }, { __index = api });
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89
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90 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
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91
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92 setfenv(mod, pluginenv);
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93
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94 local success, ret = pcall(mod);
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95 if not success then
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96 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
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97 return nil, ret;
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98 end
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99
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100 -- Use modified host, if the module set one
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101 modulemap[api_instance.host][module_name] = mod;
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102
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103 return true;
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104 end
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105
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106 function is_loaded(host, name)
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107 return modulemap[host] and modulemap[host][name] and true;
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108 end
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109
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110 function unload(host, name, ...)
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111 local mod = modulemap[host] and modulemap[host][name];
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112 if not mod then return nil, "module-not-loaded"; end
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113
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114 if type(mod.unload) == "function" then
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115 local ok, err = pcall(mod.unload, ...)
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116 if (not ok) and err then
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117 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
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118 end
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119 end
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120
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121 end
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122
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123 function handle_stanza(host, origin, stanza)
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124 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
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125 if name == "iq" and xmlns == "jabber:client" then
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126 if stanza.attr.type == "get" or stanza.attr.type == "set" then
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127 xmlns = stanza.tags[1].attr.xmlns;
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128 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
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129 else
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130 log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type);
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131 return true;
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132 end
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133 end
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134 local handlers = stanza_handlers:get(host, origin_type, name, xmlns);
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135 if handlers then
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136 log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
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137 (handlers[1])(origin, stanza);
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138 return true;
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139 else
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140 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); -- we didn't handle it
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141 end
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142 end
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143
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144 ----- API functions exposed to modules -----------
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145 -- Must all be in api.*
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146
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147 -- Returns the name of the current module
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148 function api:get_name()
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149 return self.name;
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150 end
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151
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152 -- Returns the host that the current module is serving
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153 function api:get_host()
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154 return self.host;
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155 end
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156
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157 local function _add_handler(module, origin_type, tag, xmlns, handler)
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158 local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns);
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159 local msg = (tag == "iq") and "namespace" or "payload namespace";
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160 if not handlers then
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161 stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
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162 handler_info[handler] = module;
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163 module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
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164 else
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165 module:log("warn", "I wanted to handle tag '%s' [%s] with %s '%s' but mod_%s already handles that", tag, origin_type, msg, xmlns, handler_info[handlers[1]].module.name);
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166 end
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167 end
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168
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169 function api:add_handler(origin_type, tag, xmlns, handler)
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170 if not (origin_type and tag and xmlns and handler) then return false; end
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171 if type(origin_type) == "table" then
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172 for _, origin_type in ipairs(origin_type) do
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173 _add_handler(self, origin_type, tag, xmlns, handler);
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174 end
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175 else
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176 _add_handler(self, origin_type, tag, xmlns, handler);
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177 end
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178 end
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179 function api:add_iq_handler(origin_type, xmlns, handler)
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180 self:add_handler(origin_type, "iq", xmlns, handler);
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181 end
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182
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183 function api:add_feature(xmlns)
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184 addDiscoInfoHandler(self.host, function(reply, to, from, node)
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185 if #node == 0 then
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186 reply:tag("feature", {var = xmlns}):up();
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187 return true;
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188 end
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189 end);
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190 end
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191
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192 function api:add_event_hook (...) return eventmanager.add_event_hook(...); end
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193
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194 --------------------------------------------------------------------
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195
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196 return _M;