Thu, 26 Mar 2009 03:55:45 +0000
util.array: Expose array.* functions, to be used for unwrapped arrays
894 | 1 | -- Prosody IM v0.4 |
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2 | -- Copyright (C) 2008-2009 Matthew Wild |
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3 | -- Copyright (C) 2008-2009 Waqas Hussain |
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4 | -- |
758 | 5 | -- This project is MIT/X11 licensed. Please see the |
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 | |
30 | 10 | |
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11 | local plugin_dir = CFG_PLUGINDIR or "./plugins/"; |
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12 | |
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13 | local logger = require "util.logger"; |
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14 | local log = logger.init("modulemanager"); |
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15 | local addDiscoInfoHandler = require "core.discomanager".addDiscoInfoHandler; |
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16 | local eventmanager = require "core.eventmanager"; |
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17 | local config = require "core.configmanager"; |
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18 | local multitable_new = require "util.multitable".new; |
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19 | local register_actions = require "core.actions".register; |
30 | 20 | |
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21 | local hosts = hosts; |
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22 | |
30 | 23 | local loadfile, pcall = loadfile, pcall; |
24 | local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv; | |
25 | local pairs, ipairs = pairs, ipairs; | |
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26 | local t_insert, t_concat = table.insert, table.concat; |
30 | 27 | local type = type; |
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28 | local next = next; |
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29 | local rawget = rawget; |
30 | 30 | |
31 | local tostring, print = tostring, print; | |
32 | ||
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33 | -- We need this to let modules access the real global namespace |
30 | 34 | local _G = _G; |
35 | ||
36 | module "modulemanager" | |
37 | ||
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38 | local api = {}; -- Module API container |
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39 | |
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40 | local modulemap = { ["*"] = {} }; |
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41 | |
591 | 42 | local stanza_handlers = multitable_new(); |
30 | 43 | local handler_info = {}; |
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44 | |
30 | 45 | local modulehelpers = setmetatable({}, { __index = _G }); |
46 | ||
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47 | local features_table = multitable_new(); |
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48 | local handler_table = multitable_new(); |
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49 | local hooked = multitable_new(); |
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50 | local event_hooks = multitable_new(); |
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51 | |
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52 | local NULL = {}; |
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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 | -- Load modules from global section |
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57 | local modules_enabled = config.get("*", "core", "modules_enabled"); |
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58 | local modules_disabled = config.get(host, "core", "modules_disabled"); |
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59 | local disabled_set = {}; |
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60 | if modules_enabled then |
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61 | if modules_disabled then |
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62 | for _, module in ipairs(modules_disabled) do |
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63 | disabled_set[module] = true; |
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64 | end |
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65 | end |
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66 | for _, module in ipairs(modules_enabled) do |
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67 | if not disabled_set[module] then |
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68 | load(host, module); |
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69 | end |
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70 | end |
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71 | end |
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72 | |
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73 | -- Load modules from just this host |
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74 | local modules_enabled = config.get(host, "core", "modules_enabled"); |
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75 | if modules_enabled then |
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76 | for _, module in pairs(modules_enabled) do |
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77 | if not is_loaded(host, module) then |
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78 | load(host, module); |
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79 | end |
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80 | end |
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81 | end |
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82 | end |
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83 | eventmanager.add_event_hook("host-activated", load_modules_for_host); |
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84 | -- |
30 | 85 | |
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86 | function load(host, module_name, config) |
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87 | if not (host and module_name) then |
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88 | return nil, "insufficient-parameters"; |
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89 | end |
30 | 90 | |
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91 | if not modulemap[host] then |
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92 | modulemap[host] = {}; |
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93 | end |
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94 | |
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95 | if modulemap[host][module_name] then |
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96 | log("warn", "%s is already loaded for %s, so not loading again", module_name, host); |
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97 | return nil, "module-already-loaded"; |
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98 | elseif modulemap["*"][module_name] then |
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99 | return nil, "global-module-already-loaded"; |
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100 | end |
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101 | |
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102 | |
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103 | local mod, err = loadfile(get_module_filename(module_name)); |
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104 | if not mod then |
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105 | log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil"); |
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106 | return nil, err; |
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107 | end |
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108 | |
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109 | local _log = logger.init(host..":"..module_name); |
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110 | 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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111 | |
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112 | local pluginenv = setmetatable({ module = api_instance }, { __index = _G }); |
30 | 113 | |
114 | setfenv(mod, pluginenv); | |
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115 | if not hosts[host] then hosts[host] = { type = "component", host = host, connected = false, s2sout = {} }; end |
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116 | |
30 | 117 | local success, ret = pcall(mod); |
118 | if not success then | |
119 | log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil"); | |
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120 | return nil, ret; |
30 | 121 | end |
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122 | |
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123 | -- Use modified host, if the module set one |
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124 | modulemap[api_instance.host][module_name] = pluginenv; |
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125 | |
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126 | return true; |
30 | 127 | end |
128 | ||
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129 | function get_module(host, name) |
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130 | return modulemap[host] and modulemap[host][name]; |
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131 | end |
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132 | |
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133 | function is_loaded(host, name) |
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134 | return modulemap[host] and modulemap[host][name] and true; |
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135 | end |
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136 | |
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137 | function unload(host, name, ...) |
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138 | local mod = get_module(host, name); |
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139 | if not mod then return nil, "module-not-loaded"; end |
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140 | |
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141 | if module_has_method(mod, "unload") then |
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142 | local ok, err = call_module_method(mod, "unload"); |
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143 | if (not ok) and err then |
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144 | log("warn", "Non-fatal error unloading module '%s' on '%s': %s", name, host, err); |
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145 | end |
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146 | end |
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147 | modulemap[host][name] = nil; |
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148 | features_table:remove(host, name); |
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149 | local params = handler_table:get(host, name); -- , {module.host, origin_type, tag, xmlns} |
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150 | for _, param in pairs(params or NULL) do |
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151 | local handlers = stanza_handlers:get(param[1], param[2], param[3], param[4]); |
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152 | if handlers then |
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153 | handler_info[handlers[1]] = nil; |
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154 | stanza_handlers:remove(param[1], param[2], param[3], param[4]); |
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155 | end |
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156 | end |
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157 | event_hooks:remove(host, name); |
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158 | return true; |
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159 | end |
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160 | |
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161 | function reload(host, name, ...) |
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162 | local mod = get_module(host, name); |
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163 | if not mod then return nil, "module-not-loaded"; end |
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164 | |
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165 | local _mod, err = loadfile(get_module_filename(name)); -- checking for syntax errors |
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166 | if not _mod then |
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167 | log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil"); |
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168 | return nil, err; |
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169 | end |
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170 | |
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171 | local saved; |
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172 | |
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173 | if module_has_method(mod, "save") then |
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174 | local ok, ret, err = call_module_method(mod, "save"); |
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175 | if ok then |
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176 | saved = ret; |
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177 | else |
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178 | log("warn", "Error saving module '%s:%s' state: %s", host, module, ret); |
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179 | if not config.get(host, "core", "force_module_reload") then |
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180 | log("warn", "Aborting reload due to error, set force_module_reload to ignore this"); |
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181 | return nil, "save-state-failed"; |
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182 | else |
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183 | log("warn", "Continuing with reload (using the force)"); |
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184 | end |
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185 | end |
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186 | end |
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187 | |
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188 | unload(host, name, ...); |
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189 | local ok, err = load(host, name, ...); |
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190 | if ok then |
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191 | mod = get_module(host, name); |
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192 | if module_has_method(mod, "restore") then |
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193 | local ok, err = call_module_method(mod, "restore", saved or {}) |
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194 | if (not ok) and err then |
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195 | log("warn", "Error restoring module '%s' from '%s': %s", name, host, err); |
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196 | end |
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197 | end |
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198 | return true; |
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199 | end |
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200 | return ok, err; |
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201 | end |
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202 | |
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203 | function handle_stanza(host, origin, stanza) |
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204 | local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type; |
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205 | if name == "iq" and xmlns == "jabber:client" then |
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206 | if stanza.attr.type == "get" or stanza.attr.type == "set" then |
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207 | xmlns = stanza.tags[1].attr.xmlns; |
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208 | log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns); |
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209 | else |
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210 | log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type); |
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211 | return true; |
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212 | end |
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213 | end |
591 | 214 | local handlers = stanza_handlers:get(host, origin_type, name, xmlns); |
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215 | if not handlers then handlers = stanza_handlers:get("*", origin_type, name, xmlns); end |
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216 | if handlers then |
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217 | log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name); |
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218 | (handlers[1])(origin, stanza); |
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219 | return true; |
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220 | else |
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221 | log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); -- we didn't handle it |
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222 | end |
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223 | end |
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224 | |
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225 | function module_has_method(module, method) |
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226 | return type(module.module[method]) == "function"; |
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227 | end |
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228 | |
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229 | function call_module_method(module, method, ...) |
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230 | if module_has_method(module, method) then |
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231 | local f = module.module[method]; |
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232 | return pcall(f, ...); |
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233 | else |
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234 | return false, "no-such-method"; |
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235 | end |
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236 | end |
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237 | |
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238 | local _modulepath = { plugin_dir, "mod_", nil, ".lua"}; |
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239 | function get_module_filename(name) |
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240 | _modulepath[3] = name; |
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241 | return t_concat(_modulepath); |
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242 | end |
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243 | |
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244 | ----- API functions exposed to modules ----------- |
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245 | -- Must all be in api.* |
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246 | |
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247 | -- Returns the name of the current module |
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248 | function api:get_name() |
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249 | return self.name; |
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250 | end |
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251 | |
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252 | -- Returns the host that the current module is serving |
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253 | function api:get_host() |
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254 | return self.host; |
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255 | end |
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256 | |
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257 | function api:get_host_type() |
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258 | return hosts[self.host].type; |
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259 | end |
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260 | |
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261 | function api:set_global() |
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262 | self.host = "*"; |
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263 | end |
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264 | |
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265 | local function _add_handler(module, origin_type, tag, xmlns, handler) |
591 | 266 | local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns); |
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267 | local msg = (tag == "iq") and "namespace" or "payload namespace"; |
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268 | if not handlers then |
591 | 269 | stanza_handlers:add(module.host, origin_type, tag, xmlns, handler); |
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270 | handler_info[handler] = module; |
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271 | handler_table:add(module.host, module.name, {module.host, origin_type, tag, xmlns}); |
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272 | --module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns); |
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273 | else |
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274 | 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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275 | end |
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276 | end |
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277 | |
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278 | function api:add_handler(origin_type, tag, xmlns, handler) |
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279 | if not (origin_type and tag and xmlns and handler) then return false; end |
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280 | if type(origin_type) == "table" then |
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281 | for _, origin_type in ipairs(origin_type) do |
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282 | _add_handler(self, origin_type, tag, xmlns, handler); |
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283 | end |
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284 | else |
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285 | _add_handler(self, origin_type, tag, xmlns, handler); |
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286 | end |
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287 | end |
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288 | function api:add_iq_handler(origin_type, xmlns, handler) |
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289 | self:add_handler(origin_type, "iq", xmlns, handler); |
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290 | end |
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291 | |
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292 | addDiscoInfoHandler("*host", function(reply, to, from, node) |
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293 | if #node == 0 then |
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294 | local done = {}; |
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295 | for module, features in pairs(features_table:get(to) or NULL) do -- for each module |
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296 | for feature in pairs(features) do |
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297 | if not done[feature] then |
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298 | reply:tag("feature", {var = feature}):up(); -- TODO cache |
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299 | done[feature] = true; |
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300 | end |
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301 | end |
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302 | end |
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303 | for module, features in pairs(features_table:get("*") or NULL) do -- for each module |
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304 | for feature in pairs(features) do |
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305 | if not done[feature] then |
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306 | reply:tag("feature", {var = feature}):up(); -- TODO cache |
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307 | done[feature] = true; |
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308 | end |
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309 | end |
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310 | end |
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311 | return next(done) ~= nil; |
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312 | end |
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313 | end); |
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314 | |
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315 | function api:add_feature(xmlns) |
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316 | features_table:set(self.host, self.name, xmlns, true); |
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317 | end |
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318 | |
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319 | local event_hook = function(host, mod_name, event_name, ...) |
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320 | if type((...)) == "table" and (...).host and (...).host ~= host then return; end |
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321 | for handler in pairs(event_hooks:get(host, mod_name, event_name) or NULL) do |
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322 | handler(...); |
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323 | end |
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324 | end; |
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325 | function api:add_event_hook(name, handler) |
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326 | if not hooked:get(self.host, self.name, name) then |
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327 | eventmanager.add_event_hook(name, function(...) event_hook(self.host, self.name, name, ...); end); |
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328 | hooked:set(self.host, self.name, name, true); |
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329 | end |
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330 | event_hooks:set(self.host, self.name, name, handler, true); |
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331 | end |
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332 | |
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333 | -------------------------------------------------------------------- |
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334 | |
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335 | local actions = {}; |
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336 | |
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337 | function actions.load(params) |
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338 | --return true, "Module loaded ("..params.module.." on "..params.host..")"; |
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339 | return load(params.host, params.module); |
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340 | end |
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341 | |
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342 | function actions.unload(params) |
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343 | return unload(params.host, params.module); |
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344 | end |
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345 | |
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346 | register_actions("/modules", actions); |
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347 | |
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348 | return _M; |