core/configmanager.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9
  10
  11 local _G = _G;
  12 local   setmetatable, loadfile, pcall, rawget, rawset, io, error, dofile, type, pairs, table, format =
  13                 setmetatable, loadfile, pcall, rawget, rawset, io, error, dofile, type, pairs, table, string.format;
  14
  15
  16 local eventmanager = require "core.eventmanager";
  17
  18 module "configmanager"
  19
  20 local parsers = {};
  21
  22 local config = { ["*"] = { core = {} } };
  23
  24 local global_config = config["*"];
  25
  26 -- When host not found, use global
  27 setmetatable(config, { __index = function () return global_config; end});
  28 local host_mt = { __index = global_config };
  29
  30 -- When key not found in section, check key in global's section
  31 function section_mt(section_name)
  32         return { __index =      function (t, k)
  33                                                                         local section = rawget(global_config, section_name);
  34                                                                         if not section then return nil; end
  35                                                                         return section[k];
  36                                                         end };
  37 end
  38
  39 function getconfig()
  40         return config;
  41 end
  42
  43 function get(host, section, key)
  44         local sec = config[host][section];
  45         if sec then
  46                 return sec[key];
  47         end
  48         return nil;
  49 end
  50
  51 function set(host, section, key, value)
  52         if host and section and key then
  53                 local hostconfig = rawget(config, host);
  54                 if not hostconfig then
  55                         hostconfig = rawset(config, host, setmetatable({}, host_mt))[host];
  56                 end
  57                 if not rawget(hostconfig, section) then
  58                         hostconfig[section] = setmetatable({}, section_mt(section));
  59                 end
  60                 hostconfig[section][key] = value;
  61                 return true;
  62         end
  63         return false;
  64 end
  65
  66 function load(filename, format)
  67         format = format or filename:match("%w+$");
  68
  69         if parsers[format] and parsers[format].load then
  70                 local f, err = io.open(filename);
  71                 if f then
  72                         local ok, err = parsers[format].load(f:read("*a"), filename);
  73                         f:close();
  74                         if ok then
  75                                 eventmanager.fire_event("config-reloaded", { filename = filename, format = format });
  76                         end
  77                         return ok, "parser", err;
  78                 end
  79                 return f, "file", err;
  80         end
  81
  82         if not format then
  83                 return nil, "file", "no parser specified";
  84         else
  85                 return nil, "file", "no parser for "..(format);
  86         end
  87 end
  88
  89 function save(filename, format)
  90 end
  91
  92 function addparser(format, parser)
  93         if format and parser then
  94                 parsers[format] = parser;
  95         end
  96 end
  97
  98 -- _M needed to avoid name clash with local 'parsers'
  99 function _M.parsers()
 100         local p = {};
 101         for format in pairs(parsers) do
 102                 table.insert(p, format);
 103         end
 104         return p;
 105 end
 106
 107 -- Built-in Lua parser
 108 do
 109         local loadstring, pcall, setmetatable = _G.loadstring, _G.pcall, _G.setmetatable;
 110         local setfenv, rawget, tostring = _G.setfenv, _G.rawget, _G.tostring;
 111         parsers.lua = {};
 112         function parsers.lua.load(data, filename)
 113                 local env;
 114                 -- The ' = true' are needed so as not to set off __newindex when we assign the functions below
 115                 env = setmetatable({ Host = true; host = true; Component = true, component = true,
 116                                                         Include = true, include = true, RunScript = dofile }, { __index = function (t, k)
 117                                                                                                 return rawget(_G, k) or
 118                                                                                                                 function (settings_table)
 119                                                                                                                         config[__currenthost or "*"][k] = settings_table;
 120                                                                                                                 end;
 121                                                                                 end,
 122                                                                 __newindex = function (t, k, v)
 123                                                                                         set(env.__currenthost or "*", "core", k, v);
 124                                                                                 end});
 125
 126                 rawset(env, "__currenthost", "*") -- Default is global
 127                 function env.Host(name)
 128                         if rawget(config, name) and rawget(config[name].core, "component_module") then
 129                                 error(format("Host %q clashes with previously defined %s Component %q, for services use a sub-domain like conference.%s",
 130                                         name, config[name].core.component_module:gsub("^%a+$", { component = "external", muc = "MUC"}), name, name), 0);
 131                         end
 132                         rawset(env, "__currenthost", name);
 133                         -- Needs at least one setting to logically exist :)
 134                         set(name or "*", "core", "defined", true);
 135                 end
 136                 env.host = env.Host;
 137
 138                 function env.Component(name)
 139                         if rawget(config, name) and rawget(config[name].core, "defined") and not rawget(config[name].core, "component_module") then
 140                                 error(format("Component %q clashes with previously defined Host %q, for services use a sub-domain like conference.%s",
 141                                         name, name, name), 0);
 142                         end
 143                         set(name, "core", "component_module", "component");
 144                         -- Don't load the global modules by default
 145                         set(name, "core", "load_global_modules", false);
 146                         rawset(env, "__currenthost", name);
 147
 148                         return function (module)
 149                                         if type(module) == "string" then
 150                                                 set(name, "core", "component_module", module);
 151                                         end
 152                                 end
 153                 end
 154                 env.component = env.Component;
 155
 156                 function env.Include(file)
 157                         local f, err = io.open(file);
 158                         if f then
 159                                 local data = f:read("*a");
 160                                 local ok, err = parsers.lua.load(data, file);
 161                                 if not ok then error(err:gsub("%[string.-%]", file), 0); end
 162                         end
 163                         if not f then error("Error loading included "..file..": "..err, 0); end
 164                         return f, err;
 165                 end
 166                 env.include = env.Include;
 167
 168                 local chunk, err = loadstring(data, "@"..filename);
 169
 170                 if not chunk then
 171                         return nil, err;
 172                 end
 173
 174                 setfenv(chunk, env);
 175
 176                 local ok, err = pcall(chunk);
 177
 178                 if not ok then
 179                         return nil, err;
 180                 end
 181
 182                 return true;
 183         end
 184
 185 end
 186
 187 return _M;