prosody
a9f6088a83e3
core/moduleapi.lua

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core/moduleapi.lua @ 4718:a9f6088a83e3

moduleapi: get_host_type(): Return nil for global modules (no host)
author Matthew Wild <mwild1@gmail.com>
date Fri, 27 Apr 2012 18:34:40 +0100
parent 4708:0e324923ff95
child 4719:2087d42f1e77
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2012 Matthew Wild
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3 -- Copyright (C) 2008-2012 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 local config = require "core.configmanager";
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10 local modulemanager = require "modulemanager";
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11 local array = require "util.array";
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12 local set = require "util.set";
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13 local logger = require "util.logger";
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14 local pluginloader = require "util.pluginloader";
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15
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16 local multitable_new = require "util.multitable".new;
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17
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18 local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
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19 local error, setmetatable, setfenv, type = error, setmetatable, setfenv, type;
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20 local ipairs, pairs, select, unpack = ipairs, pairs, select, unpack;
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21 local tonumber, tostring = tonumber, tostring;
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22
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23 local prosody = prosody;
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24 local hosts = prosody.hosts;
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25 local core_post_stanza = prosody.core_post_stanza;
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26
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27 -- Registry of shared module data
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28 local shared_data = setmetatable({}, { __mode = "v" });
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29
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30 local NULL = {};
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31
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32 local api = {};
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33
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34 -- Returns the name of the current module
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35 function api:get_name()
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36 return self.name;
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37 end
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38
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39 -- Returns the host that the current module is serving
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40 function api:get_host()
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41 return self.host;
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42 end
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43
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44 function api:get_host_type()
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45 return self.host ~= "*" and hosts[self.host].type or nil;
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46 end
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47
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48 function api:set_global()
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49 self.host = "*";
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50 -- Update the logger
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51 local _log = logger.init("mod_"..self.name);
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52 self.log = function (self, ...) return _log(...); end;
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53 self._log = _log;
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54 self.global = true;
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55 end
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56
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57 function api:add_feature(xmlns)
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58 self:add_item("feature", xmlns);
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59 end
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60 function api:add_identity(category, type, name)
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61 self:add_item("identity", {category = category, type = type, name = name});
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62 end
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63 function api:add_extension(data)
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64 self:add_item("extension", data);
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65 end
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66
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67 function api:fire_event(...)
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68 return (hosts[self.host] or prosody).events.fire_event(...);
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69 end
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70
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71 function api:hook_object_event(object, event, handler, priority)
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72 self.event_handlers[handler] = { name = event, priority = priority, object = object };
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73 return object.add_handler(event, handler, priority);
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74 end
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75
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76 function api:unhook_object_event(object, event, handler)
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77 return object.remove_handler(event, handler);
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78 end
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79
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80 function api:hook(event, handler, priority)
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81 return self:hook_object_event((hosts[self.host] or prosody).events, event, handler, priority);
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82 end
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83
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84 function api:hook_global(event, handler, priority)
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85 return self:hook_object_event(prosody.events, event, handler, priority);
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86 end
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87
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88 function api:hook_stanza(xmlns, name, handler, priority)
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89 if not handler and type(name) == "function" then
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90 -- If only 2 options then they specified no xmlns
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91 xmlns, name, handler, priority = nil, xmlns, name, handler;
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92 elseif not (handler and name) then
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93 self:log("warn", "Error: Insufficient parameters to module:hook_stanza()");
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94 return;
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95 end
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96 return self:hook("stanza/"..(xmlns and (xmlns..":") or "")..name, function (data) return handler(data.origin, data.stanza, data); end, priority);
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97 end
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98
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99 function api:require(lib)
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100 local f, n = pluginloader.load_code(self.name, lib..".lib.lua");
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101 if not f then
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102 f, n = pluginloader.load_code(lib, lib..".lib.lua");
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103 end
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104 if not f then error("Failed to load plugin library '"..lib.."', error: "..n); end -- FIXME better error message
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105 setfenv(f, self.environment);
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106 return f();
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107 end
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108
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109 function api:depends(name)
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110 if not self.dependencies then
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111 self.dependencies = {};
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112 self:hook("module-reloaded", function (event)
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113 if self.dependencies[event.module] then
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114 self:log("info", "Auto-reloading due to reload of %s:%s", event.host, event.module);
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115 modulemanager.reload(self.host, self.name);
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116 return;
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117 end
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118 end);
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119 self:hook("module-unloaded", function (event)
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120 if self.dependencies[event.module] then
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121 self:log("info", "Auto-unloading due to unload of %s:%s", event.host, event.module);
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122 modulemanager.unload(self.host, self.name);
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123 end
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124 end);
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125 end
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126 local mod = modulemanager.get_module(self.host, name) or modulemanager.get_module("*", name);
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127 if mod and mod.module.host == "*" and self.host ~= "*"
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128 and modulemanager.module_has_method(mod, "add_host") then
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129 mod = nil; -- This is a shared module, so we still want to load it on our host
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130 end
4538
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131 if not mod then
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132 local err;
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133 mod, err = modulemanager.load(self.host, name);
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134 if not mod then
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135 return error(("Unable to load required module, mod_%s: %s"):format(name, ((err or "unknown error"):gsub("%-", " ")) ));
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136 end
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137 end
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138 self.dependencies[name] = true;
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139 return mod;
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140 end
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141
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142 -- Returns one or more shared tables at the specified virtual paths
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143 -- Intentionally does not allow the table at a path to be _set_, it
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144 -- is auto-created if it does not exist.
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145 function api:shared(...)
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146 if not self.shared_data then self.shared_data = {}; end
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147 local paths = { n = select("#", ...), ... };
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148 local data_array = {};
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149 local default_path_components = { self.host, self.name };
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150 for i = 1, paths.n do
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151 local path = paths[i];
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152 if path:sub(1,1) ~= "/" then -- Prepend default components
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153 local n_components = select(2, path:gsub("/", "%1"));
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154 path = (n_components<#default_path_components and "/" or "")..t_concat(default_path_components, "/", 1, #default_path_components-n_components).."/"..path;
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155 end
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156 local shared = shared_data[path];
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157 if not shared then
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158 shared = {};
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159 shared_data[path] = shared;
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160 end
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161 t_insert(data_array, shared);
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162 self.shared_data[path] = shared;
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163 end
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164 return unpack(data_array);
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165 end
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166
4531
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167 function api:get_option(name, default_value)
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168 local value = config.get(self.host, self.name, name);
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169 if value == nil then
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170 value = config.get(self.host, "core", name);
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171 if value == nil then
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172 value = default_value;
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173 end
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174 end
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175 return value;
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176 end
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177
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178 function api:get_option_string(name, default_value)
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179 local value = self:get_option(name, default_value);
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180 if type(value) == "table" then
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181 if #value > 1 then
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182 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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183 end
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184 value = value[1];
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185 end
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186 if value == nil then
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187 return nil;
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188 end
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189 return tostring(value);
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190 end
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191
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192 function api:get_option_number(name, ...)
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193 local value = self:get_option(name, ...);
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194 if type(value) == "table" then
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195 if #value > 1 then
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196 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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197 end
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198 value = value[1];
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199 end
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200 local ret = tonumber(value);
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201 if value ~= nil and ret == nil then
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202 self:log("error", "Config option '%s' not understood, expecting a number", name);
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203 end
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204 return ret;
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205 end
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206
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207 function api:get_option_boolean(name, ...)
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208 local value = self:get_option(name, ...);
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209 if type(value) == "table" then
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210 if #value > 1 then
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211 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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212 end
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213 value = value[1];
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214 end
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215 if value == nil then
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216 return nil;
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217 end
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218 local ret = value == true or value == "true" or value == 1 or nil;
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219 if ret == nil then
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220 ret = (value == false or value == "false" or value == 0);
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221 if ret then
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222 ret = false;
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223 else
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224 ret = nil;
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225 end
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226 end
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227 if ret == nil then
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228 self:log("error", "Config option '%s' not understood, expecting true/false", name);
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229 end
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230 return ret;
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231 end
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232
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233 function api:get_option_array(name, ...)
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234 local value = self:get_option(name, ...);
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235
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236 if value == nil then
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237 return nil;
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238 end
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239
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240 if type(value) ~= "table" then
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241 return array{ value }; -- Assume any non-list is a single-item list
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242 end
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243
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244 return array():append(value); -- Clone
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245 end
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246
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247 function api:get_option_set(name, ...)
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248 local value = self:get_option_array(name, ...);
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249
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250 if value == nil then
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251 return nil;
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252 end
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253
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254 return set.new(value);
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255 end
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256
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257 local module_items = multitable_new();
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258 function api:add_item(key, value)
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259 self.items = self.items or {};
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260 self.items[key] = self.items[key] or {};
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261 t_insert(self.items[key], value);
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262 self:fire_event("item-added/"..key, {source = self, item = value});
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263 end
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264 function api:remove_item(key, value)
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265 local t = self.items and self.items[key] or NULL;
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266 for i = #t,1,-1 do
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267 if t[i] == value then
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268 t_remove(self.items[key], i);
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269 self:fire_event("item-removed/"..key, {source = self, item = value});
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270 return value;
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271 end
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272 end
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273 end
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274
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275 function api:get_host_items(key)
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276 local result = {};
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277 for mod_name, module in pairs(modulemanager.get_modules(self.host)) do
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278 module = module.module;
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279 if module.items then
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280 for _, item in ipairs(module.items[key] or NULL) do
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281 t_insert(result, item);
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282 end
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283 end
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284 end
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285 for mod_name, module in pairs(modulemanager.get_modules("*")) do
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286 module = module.module;
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287 if module.items then
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288 for _, item in ipairs(module.items[key] or NULL) do
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289 t_insert(result, item);
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290 end
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291 end
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292 end
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293 return result;
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294 end
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295
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296 function api:handle_items(type, added_cb, removed_cb, existing)
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297 self:hook("item-added/"..type, added_cb);
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298 self:hook("item-removed/"..type, removed_cb);
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299 if existing ~= false then
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300 for _, item in ipairs(self:get_host_items(type)) do
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301 added_cb({ item = item });
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302 end
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303 end
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304 end
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305
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306 function api:provides(name, item)
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307 if not item then item = self.environment; end
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308 if not item.name then
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309 local item_name = self.name;
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310 -- Strip a provider prefix to find the item name
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311 -- (e.g. "auth_foo" -> "foo" for an auth provider)
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312 if item_name:find(name.."_", 1, true) == 1 then
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313 item_name = item_name:sub(#name+2);
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314 end
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315 item.name = item_name;
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316 end
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317 self:add_item(name.."-provider", item);
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318 end
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319
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320 function api:send(stanza)
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321 return core_post_stanza(hosts[self.host], stanza);
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322 end
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323
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324 function api:add_timer(delay, callback)
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325 return timer.add_task(delay, function (t)
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326 if self.loaded == false then return; end
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327 return callback(t);
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328 end);
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329 end
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330
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331 return api;