aboutsummaryrefslogtreecommitdiffstats
path: root/core/configmanager.lua
blob: 03532c0c8545341dbab2239c37c77b781192c01c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
-- 
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--



local _G = _G;
local 	setmetatable, loadfile, pcall, rawget, rawset, io, error, dofile, type, pairs, table, format =
		setmetatable, loadfile, pcall, rawget, rawset, io, error, dofile, type, pairs, table, string.format;


local eventmanager = require "core.eventmanager";

module "configmanager"

local parsers = {};

local config = { ["*"] = { core = {} } };

local global_config = config["*"];

-- When host not found, use global
setmetatable(config, { __index = function () return global_config; end});
local host_mt = { __index = global_config };

-- When key not found in section, check key in global's section
function section_mt(section_name)
	return { __index = 	function (t, k)
					local section = rawget(global_config, section_name);
					if not section then return nil; end
					return section[k];
				end
	};
end

function getconfig()
	return config;
end

function get(host, section, key)
	local sec = config[host][section];
	if sec then
		return sec[key];
	end
	return nil;
end

function set(host, section, key, value)
	if host and section and key then
		local hostconfig = rawget(config, host);
		if not hostconfig then
			hostconfig = rawset(config, host, setmetatable({}, host_mt))[host];
		end
		if not rawget(hostconfig, section) then
			hostconfig[section] = setmetatable({}, section_mt(section));
		end
		hostconfig[section][key] = value;
		return true;
	end
	return false;
end

function load(filename, format)
	format = format or filename:match("%w+$");

	if parsers[format] and parsers[format].load then
		local f, err = io.open(filename);
		if f then
			local ok, err = parsers[format].load(f:read("*a"), filename);
			f:close();
			if ok then
				eventmanager.fire_event("config-reloaded", { filename = filename, format = format });
			end
			return ok, "parser", err;
		end
		return f, "file", err;
	end

	if not format then
		return nil, "file", "no parser specified";
	else
		return nil, "file", "no parser for "..(format);
	end
end

function save(filename, format)
end

function addparser(format, parser)
	if format and parser then
		parsers[format] = parser;
	end
end

-- _M needed to avoid name clash with local 'parsers'
function _M.parsers()
	local p = {};
	for format in pairs(parsers) do
		table.insert(p, format);
	end
	return p;
end

-- Built-in Lua parser
do
	local loadstring, pcall, setmetatable = _G.loadstring, _G.pcall, _G.setmetatable;
	local setfenv, rawget, tostring = _G.setfenv, _G.rawget, _G.tostring;
	parsers.lua = {};
	function parsers.lua.load(data, filename)
		local env;
		-- The ' = true' are needed so as not to set off __newindex when we assign the functions below
		env = setmetatable({ Host = true; host = true; Component = true, component = true,
							Include = true, include = true, RunScript = dofile }, { __index = function (t, k)
												return rawget(_G, k) or
														function (settings_table)
															config[__currenthost or "*"][k] = settings_table;
														end;
										end,
								__newindex = function (t, k, v)
											set(env.__currenthost or "*", "core", k, v);
										end});
		
		rawset(env, "__currenthost", "*") -- Default is global
		function env.Host(name)
			if rawget(config, name) and rawget(config[name].core, "component_module") then
				error(format("Host %q clashes with previously defined %s Component %q, for services use a sub-domain like conference.%s",
					name, config[name].core.component_module:gsub("^%a+$", { component = "external", muc = "MUC"}), name, name), 0);
			end
			rawset(env, "__currenthost", name);
			-- Needs at least one setting to logically exist :)
			set(name or "*", "core", "defined", true);
		end
		env.host = env.Host;
		
		function env.Component(name)
			if rawget(config, name) and rawget(config[name].core, "defined") and not rawget(config[name].core, "component_module") then
				error(format("Component %q clashes with previously defined Host %q, for services use a sub-domain like conference.%s",
					name, name, name), 0);
			end
			set(name, "core", "component_module", "component");
			-- Don't load the global modules by default
			set(name, "core", "load_global_modules", false);
			rawset(env, "__currenthost", name);
	
			return function (module)
					if type(module) == "string" then
						set(name, "core", "component_module", module);
					end
				end
		end
		env.component = env.Component;
		
		function env.Include(file)
			local f, err = io.open(file);
			if f then
				local data = f:read("*a");
				local ok, err = parsers.lua.load(data, file);
				if not ok then error(err:gsub("%[string.-%]", file), 0); end
			end
			if not f then error("Error loading included "..file..": "..err, 0); end
			return f, err;
		end
		env.include = env.Include;
		
		local chunk, err = loadstring(data, "@"..filename);
		
		if not chunk then
			return nil, err;
		end
		
		setfenv(chunk, env);
		
		local ok, err = pcall(chunk);
		
		if not ok then
			return nil, err;
		end
		
		return true;
	end
	
end

return _M;