File

core/configmanager.lua @ 12591:494577d883ff

util.table: Fix inaccurate comment Probably a duplicate of the comment next to Lmove, recorded by mistake Lpack can probably be removed at some point in the near future once we are confident it is not used anywhere.
author Kim Alvefur <zash@zash.se>
date Mon, 11 Jul 2022 20:02:10 +0200
parent 12531:32bcb899526f
child 12972:ead41e25ebc0
line wrap: on
line source

-- 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, ipairs =
      setmetatable, rawget, rawset, io, os, error, dofile, type, pairs, ipairs;
local format, math_max, t_insert = string.format, math.max, table.insert;

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 get_traceback_table = require "util.debug".get_traceback_table;

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);
local files = {};

-- 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)
	return config[host][key];
end
function _M.rawget(host, key)
	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)
	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

function _M.files()
	return files;
end

-- Built-in Lua parser
do
	local pcall = _G.pcall;
	local function get_line_number(config_file)
		local tb = get_traceback_table(nil, 2);
		for i = 1, #tb do
			if tb[i].info.short_src == config_file then
				return tb[i].info.currentline;
			end
		end
	end
	parser = {};
	function parser.load(data, config_file, config_table)
		local set_options = {}; -- set_options[host.."/"..option_name] = true (when the option has been set already in this file)
		local warnings = {};
		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)
					local host = env.__currenthost or "*";
					local option_path = host.."/"..k;
					if set_options[option_path] then
						t_insert(warnings, ("%s:%d: Duplicate option '%s'"):format(config_file, get_line_number(config_file), k));
					end
					set_options[option_path] = true;
					set(config_table, env.__currenthost or "*", k, v);
				end
		});

		rawset(env, "__currenthost", "*") -- Default is global
		function env.VirtualHost(name)
			if not name then
				error("Host must have a name", 2);
			end
			local prepped_name = nameprep(name);
			if not prepped_name then
				error(format("Name of Host %q contains forbidden characters", name), 0);
			end
			name = prepped_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
				if type(config_options) == "string" then
					error(format("VirtualHost entries do not accept a module name (module '%s' provided for host '%s')", config_options, name), 2);
				elseif type(config_options) ~= "table" then
					error("Invalid syntax following VirtualHost, expected options but received a "..type(config_options), 2);
				end
				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)
			if not name then
				error("Component must have a name", 2);
			end
			local prepped_name = nameprep(name);
			if not prepped_name then
				error(format("Name of Component %q contains forbidden characters", name), 0);
			end
			name = prepped_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 VirtualHost %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
				if err then
					for _, warning in ipairs(err) do
						t_insert(warnings, warning);
					end
				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

		t_insert(files, config_file);

		return true, warnings;
	end

end

return _M;