core/configmanager.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 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 local _G = _G;
  10 local setmetatable, rawget, rawset, io, error, dofile, type, pairs, table =
  11       setmetatable, rawget, rawset, io, error, dofile, type, pairs, table;
  12 local format, math_max = string.format, math.max;
  13
  14 local fire_event = prosody and prosody.events.fire_event or function () end;
  15
  16 local envload = require"util.envload".envload;
  17 local deps = require"util.dependencies";
  18 local resolve_relative_path = require"util.paths".resolve_relative_path;
  19 local glob_to_pattern = require"util.paths".glob_to_pattern;
  20 local path_sep = package.config:sub(1,1);
  21
  22 local have_encodings, encodings = pcall(require, "util.encodings");
  23 local nameprep = have_encodings and encodings.stringprep.nameprep or function (host) return host:lower(); end
  24
  25 module "configmanager"
  26
  27 _M.resolve_relative_path = resolve_relative_path; -- COMPAT
  28
  29 local parsers = {};
  30
  31 local config_mt = { __index = function (t, _) return rawget(t, "*"); end};
  32 local config = setmetatable({ ["*"] = { } }, config_mt);
  33
  34 -- When host not found, use global
  35 local host_mt = { __index = function(_, k) return config["*"][k] end }
  36
  37 function getconfig()
  38         return config;
  39 end
  40
  41 function get(host, key, _oldkey)
  42         if key == "core" then
  43                 key = _oldkey; -- COMPAT with code that still uses "core"
  44         end
  45         return config[host][key];
  46 end
  47 function _M.rawget(host, key, _oldkey)
  48         if key == "core" then
  49                 key = _oldkey; -- COMPAT with code that still uses "core"
  50         end
  51         local hostconfig = rawget(config, host);
  52         if hostconfig then
  53                 return rawget(hostconfig, key);
  54         end
  55 end
  56
  57 local function set(config_table, host, key, value)
  58         if host and key then
  59                 local hostconfig = rawget(config_table, host);
  60                 if not hostconfig then
  61                         hostconfig = rawset(config_table, host, setmetatable({}, host_mt))[host];
  62                 end
  63                 hostconfig[key] = value;
  64                 return true;
  65         end
  66         return false;
  67 end
  68
  69 function _M.set(host, key, value, _oldvalue)
  70         if key == "core" then
  71                 key, value = value, _oldvalue; --COMPAT with code that still uses "core"
  72         end
  73         return set(config, host, key, value);
  74 end
  75
  76 function load(filename, config_format)
  77         config_format = config_format or filename:match("%w+$");
  78
  79         if parsers[config_format] and parsers[config_format].load then
  80                 local f, err = io.open(filename);
  81                 if f then
  82                         local new_config = setmetatable({ ["*"] = { } }, config_mt);
  83                         local ok, err = parsers[config_format].load(f:read("*a"), filename, new_config);
  84                         f:close();
  85                         if ok then
  86                                 config = new_config;
  87                                 fire_event("config-reloaded", {
  88                                         filename = filename,
  89                                         format = config_format,
  90                                         config = config
  91                                 });
  92                         end
  93                         return ok, "parser", err;
  94                 end
  95                 return f, "file", err;
  96         end
  97
  98         if not config_format then
  99                 return nil, "file", "no parser specified";
 100         else
 101                 return nil, "file", "no parser for "..(config_format);
 102         end
 103 end
 104
 105 function addparser(config_format, parser)
 106         if config_format and parser then
 107                 parsers[config_format] = parser;
 108         end
 109 end
 110
 111 -- _M needed to avoid name clash with local 'parsers'
 112 function _M.parsers()
 113         local p = {};
 114         for config_format in pairs(parsers) do
 115                 table.insert(p, config_format);
 116         end
 117         return p;
 118 end
 119
 120 -- Built-in Lua parser
 121 do
 122         local pcall = _G.pcall;
 123         parsers.lua = {};
 124         function parsers.lua.load(data, config_file, config_table)
 125                 local env;
 126                 -- The ' = true' are needed so as not to set off __newindex when we assign the functions below
 127                 env = setmetatable({
 128                         Host = true, host = true, VirtualHost = true,
 129                         Component = true, component = true,
 130                         Include = true, include = true, RunScript = true }, {
 131                                 __index = function (t, k)
 132                                         return rawget(_G, k);
 133                                 end,
 134                                 __newindex = function (t, k, v)
 135                                         set(config, env.__currenthost or "*", k, v);
 136                                 end
 137                 });
 138
 139                 rawset(env, "__currenthost", "*") -- Default is global
 140                 function env.VirtualHost(name)
 141                         name = nameprep(name);
 142                         if rawget(config_table, name) and rawget(config_table[name], "component_module") then
 143                                 error(format("Host %q clashes with previously defined %s Component %q, for services use a sub-domain like conference.%s",
 144                                         name, config_table[name].component_module:gsub("^%a+$", { component = "external", muc = "MUC"}), name, name), 0);
 145                         end
 146                         rawset(env, "__currenthost", name);
 147                         -- Needs at least one setting to logically exist :)
 148                         set(config_table, name or "*", "defined", true);
 149                         return function (config_options)
 150                                 rawset(env, "__currenthost", "*"); -- Return to global scope
 151                                 for option_name, option_value in pairs(config_options) do
 152                                         set(config_table, name or "*", option_name, option_value);
 153                                 end
 154                         end;
 155                 end
 156                 env.Host, env.host = env.VirtualHost, env.VirtualHost;
 157
 158                 function env.Component(name)
 159                         name = nameprep(name);
 160                         if rawget(config_table, name) and rawget(config_table[name], "defined") and not rawget(config_table[name], "component_module") then
 161                                 error(format("Component %q clashes with previously defined Host %q, for services use a sub-domain like conference.%s",
 162                                         name, name, name), 0);
 163                         end
 164                         set(config_table, name, "component_module", "component");
 165                         -- Don't load the global modules by default
 166                         set(config_table, name, "load_global_modules", false);
 167                         rawset(env, "__currenthost", name);
 168                         local function handle_config_options(config_options)
 169                                 rawset(env, "__currenthost", "*"); -- Return to global scope
 170                                 for option_name, option_value in pairs(config_options) do
 171                                         set(config_table, name or "*", option_name, option_value);
 172                                 end
 173                         end
 174
 175                         return function (module)
 176                                         if type(module) == "string" then
 177                                                 set(config_table, name, "component_module", module);
 178                                                 return handle_config_options;
 179                                         end
 180                                         return handle_config_options(module);
 181                                 end
 182                 end
 183                 env.component = env.Component;
 184
 185                 function env.Include(file)
 186                         if file:match("[*?]") then
 187                                 local lfs = deps.softreq "lfs";
 188                                 if not lfs then
 189                                         error(format("Error expanding wildcard pattern in Include %q - LuaFileSystem not available", file));
 190                                 end
 191                                 local path_pos, glob = file:match("()([^"..path_sep.."]+)$");
 192                                 local path = file:sub(1, math_max(path_pos-2,0));
 193                                 local config_path = config_file:gsub("[^"..path_sep.."]+$", "");
 194                                 if #path > 0 then
 195                                         path = resolve_relative_path(config_path, path);
 196                                 else
 197                                         path = config_path;
 198                                 end
 199                                 local patt = glob_to_pattern(glob);
 200                                 for f in lfs.dir(path) do
 201                                         if f:sub(1,1) ~= "." and f:match(patt) then
 202                                                 env.Include(path..path_sep..f);
 203                                         end
 204                                 end
 205                         else
 206                                 local file = resolve_relative_path(config_file:gsub("[^"..path_sep.."]+$", ""), file);
 207                                 local f, err = io.open(file);
 208                                 if f then
 209                                         local ret, err = parsers.lua.load(f:read("*a"), file, config);
 210                                         if not ret then error(err:gsub("%[string.-%]", file), 0); end
 211                                 end
 212                                 if not f then error("Error loading included "..file..": "..err, 0); end
 213                                 return f, err;
 214                         end
 215                 end
 216                 env.include = env.Include;
 217
 218                 function env.RunScript(file)
 219                         return dofile(resolve_relative_path(config_file:gsub("[^"..path_sep.."]+$", ""), file));
 220                 end
 221
 222                 local chunk, err = envload(data, "@"..config_file, env);
 223
 224                 if not chunk then
 225                         return nil, err;
 226                 end
 227
 228                 local ok, err = pcall(chunk);
 229
 230                 if not ok then
 231                         return nil, err;
 232                 end
 233
 234                 return true;
 235         end
 236
 237 end
 238
 239 return _M;