prosody
352cd61e2682
core/moduleapi.lua

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core/moduleapi.lua @ 4638:352cd61e2682

modulemanager: Allow loading a module onto "*" (part-fixes #228)
author Matthew Wild <mwild1@gmail.com>
date Sat, 21 Apr 2012 20:00:30 +0100
parent 4614:20940729c1b4
child 4651:d1739d72100a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 hosts[self.host].type;
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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:hook(event, handler, priority)
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77 return self:hook_object_event((hosts[self.host] or prosody).events, event, handler, priority);
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78 end
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79
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80 function api:hook_global(event, handler, priority)
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81 return self:hook_object_event(prosody.events, event, handler, priority);
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82 end
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83
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84 function api:hook_stanza(xmlns, name, handler, priority)
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85 if not handler and type(name) == "function" then
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86 -- If only 2 options then they specified no xmlns
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87 xmlns, name, handler, priority = nil, xmlns, name, handler;
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88 elseif not (handler and name) then
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89 self:log("warn", "Error: Insufficient parameters to module:hook_stanza()");
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90 return;
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91 end
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92 return self:hook("stanza/"..(xmlns and (xmlns..":") or "")..name, function (data) return handler(data.origin, data.stanza, data); end, priority);
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93 end
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94
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95 function api:require(lib)
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96 local f, n = pluginloader.load_code(self.name, lib..".lib.lua");
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97 if not f then
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98 f, n = pluginloader.load_code(lib, lib..".lib.lua");
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99 end
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100 if not f then error("Failed to load plugin library '"..lib.."', error: "..n); end -- FIXME better error message
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101 setfenv(f, self.environment);
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102 return f();
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103 end
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104
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105 function api:depends(name)
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106 if not self.dependencies then
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107 self.dependencies = {};
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108 self:hook("module-reloaded", function (event)
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109 if self.dependencies[event.module] then
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110 self:log("info", "Auto-reloading due to reload of %s:%s", event.host, event.module);
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111 modulemanager.reload(self.host, self.name);
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112 return;
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113 end
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114 end);
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115 self:hook("module-unloaded", function (event)
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116 if self.dependencies[event.module] then
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117 self:log("info", "Auto-unloading due to unload of %s:%s", event.host, event.module);
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118 modulemanager.unload(self.host, self.name);
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119 end
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120 end);
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121 end
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122 local mod = modulemanager.get_module(self.host, name) or modulemanager.get_module("*", name);
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123 if not mod then
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124 local err;
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125 mod, err = modulemanager.load(self.host, name);
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126 if not mod then
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127 return error(("Unable to load required module, mod_%s: %s"):format(name, ((err or "unknown error"):gsub("%-", " ")) ));
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128 end
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129 end
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130 self.dependencies[name] = true;
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131 return mod;
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132 end
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133
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134 -- Returns one or more shared tables at the specified virtual paths
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135 -- Intentionally does not allow the table at a path to be _set_, it
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136 -- is auto-created if it does not exist.
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137 function api:shared(...)
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138 local paths = { n = select("#", ...), ... };
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139 local data_array = {};
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140 local default_path_components = { self.host, self.name };
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141 for i = 1, paths.n do
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142 local path = paths[i];
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143 if path:sub(1,1) ~= "/" then -- Prepend default components
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144 local n_components = select(2, path:gsub("/", "%1"));
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145 path = (n_components<#default_path_components and "/" or "")..t_concat(default_path_components, "/", 1, #default_path_components-n_components).."/"..path;
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146 end
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147 local shared = shared_data[path];
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148 if not shared then
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149 shared = {};
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150 shared_data[path] = shared;
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151 end
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152 t_insert(data_array, shared);
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153 end
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154 return unpack(data_array);
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155 end
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156
4531
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157 function api:get_option(name, default_value)
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158 local value = config.get(self.host, self.name, name);
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159 if value == nil then
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160 value = config.get(self.host, "core", name);
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161 if value == nil then
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162 value = default_value;
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163 end
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164 end
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165 return value;
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166 end
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167
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168 function api:get_option_string(name, default_value)
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169 local value = self:get_option(name, default_value);
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170 if type(value) == "table" then
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171 if #value > 1 then
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172 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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173 end
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174 value = value[1];
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175 end
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176 if value == nil then
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177 return nil;
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178 end
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179 return tostring(value);
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180 end
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181
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182 function api:get_option_number(name, ...)
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183 local value = self:get_option(name, ...);
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184 if type(value) == "table" then
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185 if #value > 1 then
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186 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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187 end
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188 value = value[1];
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189 end
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190 local ret = tonumber(value);
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191 if value ~= nil and ret == nil then
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192 self:log("error", "Config option '%s' not understood, expecting a number", name);
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193 end
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194 return ret;
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195 end
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196
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197 function api:get_option_boolean(name, ...)
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198 local value = self:get_option(name, ...);
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199 if type(value) == "table" then
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200 if #value > 1 then
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201 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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202 end
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203 value = value[1];
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204 end
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205 if value == nil then
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206 return nil;
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207 end
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208 local ret = value == true or value == "true" or value == 1 or nil;
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209 if ret == nil then
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210 ret = (value == false or value == "false" or value == 0);
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211 if ret then
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212 ret = false;
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213 else
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214 ret = nil;
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215 end
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216 end
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217 if ret == nil then
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218 self:log("error", "Config option '%s' not understood, expecting true/false", name);
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219 end
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220 return ret;
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221 end
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222
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223 function api:get_option_array(name, ...)
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224 local value = self:get_option(name, ...);
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225
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226 if value == nil then
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227 return nil;
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228 end
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229
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230 if type(value) ~= "table" then
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231 return array{ value }; -- Assume any non-list is a single-item list
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232 end
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233
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234 return array():append(value); -- Clone
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235 end
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236
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237 function api:get_option_set(name, ...)
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238 local value = self:get_option_array(name, ...);
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239
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240 if value == nil then
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241 return nil;
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242 end
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243
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244 return set.new(value);
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245 end
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246
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247 local module_items = multitable_new();
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248 function api:add_item(key, value)
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249 self.items = self.items or {};
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250 self.items[key] = self.items[key] or {};
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251 t_insert(self.items[key], value);
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252 self:fire_event("item-added/"..key, {source = self, item = value});
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253 end
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254 function api:remove_item(key, value)
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255 local t = self.items and self.items[key] or NULL;
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256 for i = #t,1,-1 do
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257 if t[i] == value then
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258 t_remove(self.items[key], i);
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259 self:fire_event("item-removed/"..key, {source = self, item = value});
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260 return value;
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261 end
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262 end
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263 end
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264
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265 function api:get_host_items(key)
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266 local result = {};
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267 for mod_name, module in pairs(modulemanager.get_modules(self.host)) do
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268 module = module.module;
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269 if module.items then
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270 for _, item in ipairs(module.items[key] or NULL) do
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271 t_insert(result, item);
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272 end
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273 end
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274 end
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275 for mod_name, module in pairs(modulemanager.get_modules("*")) do
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276 module = module.module;
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277 if module.items then
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278 for _, item in ipairs(module.items[key] or NULL) do
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279 t_insert(result, item);
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280 end
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281 end
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282 end
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283 return result;
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284 end
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285
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286 function api:handle_items(type, added_cb, removed_cb, existing)
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287 self:hook("item-added/"..type, added_cb);
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288 self:hook("item-removed/"..type, removed_cb);
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289 if existing ~= false then
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290 for _, item in ipairs(self:get_host_items(type)) do
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291 added_cb({ item = item });
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292 end
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293 end
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294 end
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295
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296 function api:provides(name, item)
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297 if not item then item = self.environment; end
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298 if not item.name then
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299 local item_name = module.name;
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300 -- Strip a provider prefix to find the item name
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301 -- (e.g. "auth_foo" -> "foo" for an auth provider)
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302 if item_name:find(name.."_", 1, true) == 1 then
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303 item_name = item_name:sub(#name+2);
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304 end
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305 item.name = item_name;
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306 end
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307 self:add_item(name, item);
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308 end
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309
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310 function api:send(stanza)
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311 return core_post_stanza(hosts[self.host], stanza);
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312 end
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313
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314 return api;