2 -- Copyright (C) 2008 Matthew Wild
3 -- Copyright (C) 2008 Waqas Hussain
5 -- This program is free software; you can redistribute it and/or
6 -- modify it under the terms of the GNU General Public License
7 -- as published by the Free Software Foundation; either version 2
8 -- of the License, or (at your option) any later version.
10 -- This program is distributed in the hope that it will be useful,
11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 -- GNU General Public License for more details.
15 -- You should have received a copy of the GNU General Public License
16 -- along with this program; if not, write to the Free Software
17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
22 local plugin_dir = CFG_PLUGINDIR or "./plugins/";
24 local logger = require "util.logger";
25 local log = logger.init("modulemanager");
26 local addDiscoInfoHandler = require "core.discomanager".addDiscoInfoHandler;
27 local eventmanager = require "core.eventmanager";
28 local config = require "core.configmanager";
31 local loadfile, pcall = loadfile, pcall;
32 local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv;
33 local pairs, ipairs = pairs, ipairs;
34 local t_insert = table.insert;
37 local tostring, print = tostring, print;
39 -- We need this to let modules access the real global namespace
42 module "modulemanager"
44 local api = {}; -- Module API container
48 local handler_info = {};
49 local stanza_handlers = {};
51 local modulehelpers = setmetatable({}, { __index = _G });
53 -- Load modules when a host is activated
54 function load_modules_for_host(host)
55 local modules_enabled = config.get(host, "core", "modules_enabled");
56 if modules_enabled then
57 for _, module in pairs(modules_enabled) do
62 eventmanager.add_event_hook("host-activated", load_modules_for_host);
65 function load(host, module_name, config)
66 if not (host and module_name) then
67 return nil, "insufficient-parameters";
69 local mod, err = loadfile(plugin_dir.."mod_"..module_name..".lua");
71 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
75 if not modulemap[host] then
77 stanza_handlers[host] = {};
78 elseif modulemap[host][module_name] then
79 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
80 return nil, "module-already-loaded";
83 local _log = logger.init(host..":"..module_name);
84 local api_instance = setmetatable({ name = module_name, host = host, config = config, _log = _log, log = function (self, ...) return _log(...); end }, { __index = api });
86 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
88 setfenv(mod, pluginenv);
90 local success, ret = pcall(mod);
92 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
96 modulemap[host][module_name] = mod;
101 function is_loaded(host, name)
102 return modulemap[host] and modulemap[host][name] and true;
105 function unload(host, name, ...)
106 local mod = modulemap[host] and modulemap[host][name];
107 if not mod then return nil, "module-not-loaded"; end
109 if type(mod.unload) == "function" then
110 local ok, err = pcall(mod.unload, ...)
111 if (not ok) and err then
112 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
118 function handle_stanza(host, origin, stanza)
119 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
121 local handlers = stanza_handlers[host];
123 log("warn", "No handlers for %s", host);
127 if name == "iq" and xmlns == "jabber:client" and handlers[origin_type] then
128 local child = stanza.tags[1];
130 local xmlns = child.attr.xmlns or xmlns;
131 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
132 local handler = handlers[origin_type][name] and handlers[origin_type][name][xmlns];
134 log("debug", "Passing stanza to mod_%s", handler_info[handler].name);
135 return handler(origin, stanza) or true;
138 elseif handlers[origin_type] then
139 local handler = handlers[origin_type][name];
141 handler = handler[xmlns];
143 log("debug", "Passing stanza to mod_%s", handler_info[handler].name);
144 return handler(origin, stanza) or true;
148 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns);
149 return false; -- we didn't handle it
152 ----- API functions exposed to modules -----------
153 -- Must all be in api.*
155 -- Returns the name of the current module
156 function api:get_name()
160 -- Returns the host that the current module is serving
161 function api:get_host()
166 local function _add_iq_handler(module, origin_type, xmlns, handler)
167 local handlers = stanza_handlers[module.host];
168 handlers[origin_type] = handlers[origin_type] or {};
169 handlers[origin_type].iq = handlers[origin_type].iq or {};
170 if not handlers[origin_type].iq[xmlns] then
171 handlers[origin_type].iq[xmlns]= handler;
172 handler_info[handler] = module;
173 module:log("debug", "I now handle tag 'iq' [%s] with payload namespace '%s'", origin_type, xmlns);
175 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);
179 function api:add_iq_handler(origin_type, xmlns, handler)
180 if not (origin_type and handler and xmlns) then return false; end
181 if type(origin_type) == "table" then
182 for _, origin_type in ipairs(origin_type) do
183 _add_iq_handler(self, origin_type, xmlns, handler);
187 _add_iq_handler(self, origin_type, xmlns, handler);
190 function api:add_feature(xmlns)
191 addDiscoInfoHandler(self.host, function(reply, to, from, node)
193 reply:tag("feature", {var = xmlns}):up();
199 api.add_event_hook = eventmanager.add_event_hook;
201 local function _add_handler(module, origin_type, tag, xmlns, handler)
202 local handlers = stanza_handlers[module.host];
203 handlers[origin_type] = handlers[origin_type] or {};
204 if not handlers[origin_type][tag] then
205 handlers[origin_type][tag] = handlers[origin_type][tag] or {};
206 handlers[origin_type][tag][xmlns]= handler;
207 handler_info[handler] = module;
208 module:log("debug", "I now handle tag '%s' [%s] with xmlns '%s'", tag, origin_type, xmlns);
209 elseif handler_info[handlers[origin_type][tag]] then
210 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);
214 function api:add_handler(origin_type, tag, xmlns, handler)
215 if not (origin_type and tag and xmlns and handler) then return false; end
216 if type(origin_type) == "table" then
217 for _, origin_type in ipairs(origin_type) do
218 _add_handler(self, origin_type, tag, xmlns, handler);
222 _add_handler(self, origin_type, tag, xmlns, handler);
225 --------------------------------------------------------------------