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1 | -- Prosody IM v0.1 |
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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 | |
30 | 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; |
30 | 27 | |
28 | local loadfile, pcall = loadfile, pcall; | |
29 | local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv; | |
30 | local pairs, ipairs = pairs, ipairs; | |
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31 | local t_insert = table.insert; |
30 | 32 | local type = type; |
33 | ||
34 | local tostring, print = tostring, print; | |
35 | ||
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36 | -- We need this to let modules access the real global namespace |
30 | 37 | local _G = _G; |
38 | ||
39 | module "modulemanager" | |
40 | ||
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41 | local api = {}; -- Module API container |
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42 | |
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43 | local modulemap = {}; |
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44 | |
30 | 45 | local handler_info = {}; |
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46 | local stanza_handlers = {}; |
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47 | |
30 | 48 | local modulehelpers = setmetatable({}, { __index = _G }); |
49 | ||
50 | ||
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51 | function load(host, module_name, config) |
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52 | if not (host and module_name) then |
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53 | return nil, "insufficient-parameters"; |
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54 | end |
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55 | local mod, err = loadfile(plugin_dir.."mod_"..module_name..".lua"); |
30 | 56 | if not mod then |
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57 | log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil"); |
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58 | return nil, err; |
30 | 59 | end |
60 | ||
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61 | if not modulemap[host] then |
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62 | modulemap[host] = {}; |
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63 | stanza_handlers[host] = {}; |
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64 | elseif modulemap[host][module_name] then |
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65 | log("warn", "%s is already loaded for %s, so not loading again", module_name, host); |
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66 | return nil, "module-already-loaded"; |
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67 | end |
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68 | |
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69 | local _log = logger.init(host..":"..module_name); |
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70 | 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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71 | |
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72 | local pluginenv = setmetatable({ module = api_instance }, { __index = _G }); |
30 | 73 | |
74 | setfenv(mod, pluginenv); | |
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75 | |
30 | 76 | local success, ret = pcall(mod); |
77 | if not success then | |
78 | log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil"); | |
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79 | return nil, ret; |
30 | 80 | end |
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81 | |
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82 | modulemap[host][module_name] = mod; |
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83 | |
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84 | return true; |
30 | 85 | end |
86 | ||
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87 | function is_loaded(host, name) |
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88 | return modulemap[host] and modulemap[host][name] and true; |
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89 | end |
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90 | |
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91 | function unload(host, name, ...) |
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92 | local mod = modulemap[host] and modulemap[host][name]; |
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93 | if not mod then return nil, "module-not-loaded"; end |
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94 | |
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95 | if type(mod.unload) == "function" then |
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96 | local ok, err = pcall(mod.unload, ...) |
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97 | if (not ok) and err then |
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98 | log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err); |
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99 | end |
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100 | end |
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101 | |
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102 | end |
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103 | |
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104 | function handle_stanza(host, origin, stanza) |
38 | 105 | local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type; |
30 | 106 | |
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107 | local handlers = stanza_handlers[host]; |
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108 | if not handlers then |
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109 | log("warn", "No handlers for %s", host); |
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110 | return false; |
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111 | end |
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112 | |
38 | 113 | if name == "iq" and xmlns == "jabber:client" and handlers[origin_type] then |
30 | 114 | local child = stanza.tags[1]; |
115 | if child then | |
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116 | local xmlns = child.attr.xmlns or xmlns; |
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117 | log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns); |
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118 | local handler = handlers[origin_type][name] and handlers[origin_type][name][xmlns]; |
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119 | if handler then |
30 | 120 | log("debug", "Passing stanza to mod_%s", handler_info[handler].name); |
121 | return handler(origin, stanza) or true; | |
122 | end | |
123 | end | |
38 | 124 | elseif handlers[origin_type] then |
125 | local handler = handlers[origin_type][name]; | |
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126 | if handler then |
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127 | handler = handler[xmlns]; |
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128 | if handler then |
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129 | log("debug", "Passing stanza to mod_%s", handler_info[handler].name); |
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130 | return handler(origin, stanza) or true; |
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131 | end |
38 | 132 | end |
30 | 133 | end |
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134 | log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); |
30 | 135 | return false; -- we didn't handle it |
136 | end | |
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137 | |
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138 | ----- API functions exposed to modules ----------- |
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139 | -- Must all be in api.* |
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140 | |
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141 | -- Returns the name of the current module |
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142 | function api:get_name() |
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143 | return self.name; |
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144 | end |
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145 | |
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146 | -- Returns the host that the current module is serving |
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147 | function api:get_host() |
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148 | return self.host; |
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149 | end |
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150 | |
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151 | |
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152 | local function _add_iq_handler(module, origin_type, xmlns, handler) |
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153 | local handlers = stanza_handlers[module.host]; |
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154 | handlers[origin_type] = handlers[origin_type] or {}; |
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155 | handlers[origin_type].iq = handlers[origin_type].iq or {}; |
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156 | if not handlers[origin_type].iq[xmlns] then |
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157 | handlers[origin_type].iq[xmlns]= handler; |
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158 | handler_info[handler] = module; |
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159 | module:log("debug", "I now handle tag 'iq' [%s] with payload namespace '%s'", origin_type, xmlns); |
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160 | else |
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161 | module:log("warn", "I wanted to handle tag 'iq' [%s] with payload namespace '%s' but mod_%s already handles that", origin_type, xmlns, handler_info[handlers[origin_type].iq[xmlns]].name); |
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162 | end |
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163 | end |
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164 | |
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165 | function api:add_iq_handler(origin_type, xmlns, handler) |
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166 | if not (origin_type and handler and xmlns) then return false; end |
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167 | if type(origin_type) == "table" then |
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168 | for _, origin_type in ipairs(origin_type) do |
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169 | _add_iq_handler(self, origin_type, xmlns, handler); |
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170 | end |
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171 | return; |
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172 | end |
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173 | _add_iq_handler(self, origin_type, xmlns, handler); |
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174 | end |
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175 | |
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176 | function api:add_feature(xmlns) |
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177 | addDiscoInfoHandler(self.host, function(reply, to, from, node) |
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178 | if #node == 0 then |
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179 | reply:tag("feature", {var = xmlns}):up(); |
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180 | return true; |
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181 | end |
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182 | end); |
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183 | end |
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184 | |
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185 | |
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186 | do |
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187 | local event_handlers = {}; |
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188 | |
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189 | function api:add_event_hook(name, handler) |
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190 | if not event_handlers[name] then |
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191 | event_handlers[name] = {}; |
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192 | end |
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193 | t_insert(event_handlers[name] , handler); |
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194 | self:log("debug", "Subscribed to %s", name); |
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195 | end |
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196 | |
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197 | function fire_event(name, ...) |
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198 | local event_handlers = event_handlers[name]; |
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199 | if event_handlers then |
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200 | for name, handler in ipairs(event_handlers) do |
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201 | handler(...); |
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202 | end |
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203 | end |
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204 | end |
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205 | end |
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206 | |
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207 | |
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208 | local function _add_handler(module, origin_type, tag, xmlns, handler) |
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209 | local handlers = stanza_handlers[module.host]; |
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210 | handlers[origin_type] = handlers[origin_type] or {}; |
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211 | if not handlers[origin_type][tag] then |
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212 | handlers[origin_type][tag] = handlers[origin_type][tag] or {}; |
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213 | handlers[origin_type][tag][xmlns]= handler; |
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214 | handler_info[handler] = module; |
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215 | module:log("debug", "I now handle tag '%s' [%s] with xmlns '%s'", tag, origin_type, xmlns); |
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216 | elseif handler_info[handlers[origin_type][tag]] then |
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217 | log("warning", "I wanted to handle tag '%s' [%s] but mod_%s already handles that", tag, origin_type, handler_info[handlers[origin_type][tag]].module.name); |
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218 | end |
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219 | end |
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220 | |
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221 | function api:add_handler(origin_type, tag, xmlns, handler) |
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222 | if not (origin_type and tag and xmlns and handler) then return false; end |
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223 | if type(origin_type) == "table" then |
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224 | for _, origin_type in ipairs(origin_type) do |
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225 | _add_handler(self, origin_type, tag, xmlns, handler); |
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226 | end |
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227 | return; |
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228 | end |
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229 | _add_handler(self, origin_type, tag, xmlns, handler); |
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230 | end |
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231 | |
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232 | -------------------------------------------------------------------- |
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233 | |
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234 | return _M; |