aboutsummaryrefslogtreecommitdiffstats
path: root/core/configmanager.lua
blob: 1e67da9bdf55e6eade3889a1c911819c34d6545b (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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
-- 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, rawget, rawset, io, os, error, dofile, type, pairs =
      setmetatable, rawget, rawset, io, os, error, dofile, type, pairs;
local format, math_max = string.format, math.max;

local envload = require"util.envload".envload;
local deps = require"util.dependencies";
local resolve_relative_path = require"util.paths".resolve_relative_path;
local glob_to_pattern = require"util.paths".glob_to_pattern;
local path_sep = package.config:sub(1,1);

local encodings = deps.softreq"util.encodings";
local nameprep = encodings and encodings.stringprep.nameprep or function (host) return host:lower(); end

local _M = {};
local _ENV = nil;
-- luacheck: std none

_M.resolve_relative_path = resolve_relative_path; -- COMPAT

local parser = nil;

local config_mt = { __index = function (t, _) return rawget(t, "*"); end};
local config = setmetatable({ ["*"] = { } }, config_mt);

-- When host not found, use global
local host_mt = { __index = function(_, k) return config["*"][k] end }

function _M.getconfig()
	return config;
end

function _M.get(host, key, _oldkey)
	if key == "core" then
		key = _oldkey; -- COMPAT with code that still uses "core"
	end
	return config[host][key];
end
function _M.rawget(host, key, _oldkey)
	if key == "core" then
		key = _oldkey; -- COMPAT with code that still uses "core"
	end
	local hostconfig = rawget(config, host);
	if hostconfig then
		return rawget(hostconfig, key);
	end
end

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

function _M.set(host, key, value, _oldvalue)
	if key == "core" then
		key, value = value, _oldvalue; --COMPAT with code that still uses "core"
	end
	return set(config, host, key, value);
end

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

	if config_format == "lua" then
		local f, err = io.open(filename);
		if f then
			local new_config = setmetatable({ ["*"] = { } }, config_mt);
			local ok, err = parser.load(f:read("*a"), filename, new_config);
			f:close();
			if ok then
				config = new_config;
			end
			return ok, "parser", err;
		end
		return f, "file", err;
	end

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

-- Built-in Lua parser
do
	local pcall = _G.pcall;
	parser = {};
	function parser.load(data, config_file, config_table)
		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, VirtualHost = true,
			Component = true, component = true,
			Include = true, include = true, RunScript = true }, {
				__index = function (_, k)
					if k:match("^ENV_") then
						return os.getenv(k:sub(5));
					end
					return rawget(_G, k);
				end,
				__newindex = function (_, k, v)
					set(config_table, env.__currenthost or "*", k, v);
				end
		});

		rawset(env, "__currenthost", "*") -- Default is global
		function env.VirtualHost(name)
			name = nameprep(name);
			if rawget(config_table, name) and rawget(config_table[name], "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_table[name].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(config_table, name or "*", "defined", true);
			return function (config_options)
				rawset(env, "__currenthost", "*"); -- Return to global scope
				for option_name, option_value in pairs(config_options) do
					set(config_table, name or "*", option_name, option_value);
				end
			end;
		end
		env.Host, env.host = env.VirtualHost, env.VirtualHost;

		function env.Component(name)
			name = nameprep(name);
			if rawget(config_table, name) and rawget(config_table[name], "defined")
				and not rawget(config_table[name], "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(config_table, name, "component_module", "component");
			-- Don't load the global modules by default
			set(config_table, name, "load_global_modules", false);
			rawset(env, "__currenthost", name);
			local function handle_config_options(config_options)
				rawset(env, "__currenthost", "*"); -- Return to global scope
				for option_name, option_value in pairs(config_options) do
					set(config_table, name or "*", option_name, option_value);
				end
			end

			return function (module)
					if type(module) == "string" then
						set(config_table, name, "component_module", module);
						return handle_config_options;
					end
					return handle_config_options(module);
				end
		end
		env.component = env.Component;

		function env.Include(file)
			-- Check whether this is a wildcard Include
			if file:match("[*?]") then
				local lfs = deps.softreq "lfs";
				if not lfs then
					error(format("Error expanding wildcard pattern in Include %q - LuaFileSystem not available", file));
				end
				local path_pos, glob = file:match("()([^"..path_sep.."]+)$");
				local path = file:sub(1, math_max(path_pos-2,0));
				local config_path = config_file:gsub("[^"..path_sep.."]+$", "");
				if #path > 0 then
					path = resolve_relative_path(config_path, path);
				else
					path = config_path;
				end
				local patt = glob_to_pattern(glob);
				for f in lfs.dir(path) do
					if f:sub(1,1) ~= "." and f:match(patt) then
						env.Include(path..path_sep..f);
					end
				end
				return;
			end
			-- Not a wildcard, so resolve (potentially) relative path and run through config parser
			file = resolve_relative_path(config_file:gsub("[^"..path_sep.."]+$", ""), file);
			local f, err = io.open(file);
			if f then
				local ret, err = parser.load(f:read("*a"), file, config_table);
				if not ret 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;

		function env.RunScript(file)
			return dofile(resolve_relative_path(config_file:gsub("[^"..path_sep.."]+$", ""), file));
		end

		local chunk, err = envload(data, "@"..config_file, env);

		if not chunk then
			return nil, err;
		end

		local ok, err = pcall(chunk);

		if not ok then
			return nil, err;
		end

		return true;
	end

end

return _M;