#!/usr/bin/env lua

-- 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.

--

-- prosody - main executable for Prosody XMPP server

-- Will be modified by configure script if run --

CFG_SOURCEDIR=os.getenv("PROSODY_SRCDIR");

CFG_CONFIGDIR=os.getenv("PROSODY_CFGDIR");

CFG_PLUGINDIR=os.getenv("PROSODY_PLUGINDIR");

CFG_DATADIR=os.getenv("PROSODY_DATADIR");

-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

local function is_relative(path)

	local path_sep = package.config:sub(1,1);

        return ((path_sep == "/" and path:sub(1,1) ~= "/")

	or (path_sep == "\\" and (path:sub(1,1) ~= "/" and path:sub(2,3) ~= ":\\")))

end

-- Tell Lua where to find our libraries

if CFG_SOURCEDIR then

	local function filter_relative_paths(path)

		if is_relative(path) then return ""; end

	end

	local function sanitise_paths(paths)

		return (paths:gsub("[^;]+;?", filter_relative_paths):gsub(";;+", ";"));

	end

	package.path = sanitise_paths(CFG_SOURCEDIR.."/?.lua;"..package.path);

	package.cpath = sanitise_paths(CFG_SOURCEDIR.."/?.so;"..package.cpath);

end

-- Substitute ~ with path to home directory in data path

if CFG_DATADIR then

	if os.getenv("HOME") then

		CFG_DATADIR = CFG_DATADIR:gsub("^~", os.getenv("HOME"));

	end

end

-- Global 'prosody' object

local prosody = { events = require "util.events".new(); };

_G.prosody = prosody;

-- Check dependencies

local dependencies = require "util.dependencies";

if not dependencies.check_dependencies() then

	os.exit(1);

end

-- Load the config-parsing module

config = require "core.configmanager"

-- -- -- --

-- Define the functions we call during startup, the 

-- actual startup happens right at the end, where these

-- functions get called

function read_config()

	local filenames = {};

	local filename;

	if arg[1] == "--config" and arg[2] then

		table.insert(filenames, arg[2]);

		if CFG_CONFIGDIR then

			table.insert(filenames, CFG_CONFIGDIR.."/"..arg[2]);

		end

	elseif os.getenv("PROSODY_CONFIG") then -- Passed by prosodyctl

			table.insert(filenames, os.getenv("PROSODY_CONFIG"));

	else

		for _, format in ipairs(config.parsers()) do

			table.insert(filenames, (CFG_CONFIGDIR or ".").."/prosody.cfg."..format);

		end

	end

	for _,_filename in ipairs(filenames) do

		filename = _filename;

		local file = io.open(filename);

		if file then

			file:close();

			CFG_CONFIGDIR = filename:match("^(.*)[\\/][^\\/]*$");

			break;

		end

	end

	local ok, level, err = config.load(filename);

	if not ok then

		print("\n");

		print("**************************");

		if level == "parser" then

			print("A problem occured while reading the config file "..(CFG_CONFIGDIR or ".").."/prosody.cfg.lua"..":");

			print("");

			local err_line, err_message = tostring(err):match("%[string .-%]:(%d*): (.*)");

			if err:match("chunk has too many syntax levels$") then

				print("An Include statement in a config file is including an already-included");

				print("file and causing an infinite loop. An Include statement in a config file is...");

			else

				print("Error"..(err_line and (" on line "..err_line) or "")..": "..(err_message or tostring(err)));

			end

			print("");

		elseif level == "file" then

			print("Prosody was unable to find the configuration file.");

			print("We looked for: "..(CFG_CONFIGDIR or ".").."/prosody.cfg.lua");

			print("A sample config file is included in the Prosody download called prosody.cfg.lua.dist");

			print("Copy or rename it to prosody.cfg.lua and edit as necessary.");

		end

		print("More help on configuring Prosody can be found at http://prosody.im/doc/configure");

		print("Good luck!");

		print("**************************");

		print("");

		os.exit(1);

	end

end

function load_libraries()

	-- Load socket framework

	server = require "net.server"

end	

function init_logging()

	-- Initialize logging

	require "core.loggingmanager"

end

function log_dependency_warnings()

	dependencies.log_warnings();

end

function sanity_check()

	for host, host_config in pairs(config.getconfig()) do

		if host ~= "*"

		and host_config.enabled ~= false

		and not host_config.component_module then

			return;

		end

	end

	log("error", "No enabled VirtualHost entries found in the config file.");

	log("error", "At least one active host is required for Prosody to function. Exiting...");

	os.exit(1);

end

function sandbox_require()

	-- Replace require() with one that doesn't pollute _G, required

	-- for neat sandboxing of modules

	local _realG = _G;

	local _real_require = require;

	if not getfenv then

		-- FIXME: This is a hack to replace getfenv() in Lua 5.2

		function getfenv(f) return debug.getupvalue(debug.getinfo(f or 1).func, 1); end

	end

	function require(...)

		local curr_env = getfenv(2);

		local curr_env_mt = getmetatable(curr_env);

		local _realG_mt = getmetatable(_realG);

		if curr_env_mt and curr_env_mt.__index and not curr_env_mt.__newindex and _realG_mt then

			local old_newindex, old_index;

			old_newindex, _realG_mt.__newindex = _realG_mt.__newindex, curr_env;

			old_index, _realG_mt.__index = _realG_mt.__index, function (_G, k)

				return rawget(curr_env, k);

			end;

			local ret = _real_require(...);

			_realG_mt.__newindex = old_newindex;

			_realG_mt.__index = old_index;

			return ret;

		end

		return _real_require(...);

	end

end

function set_function_metatable()

	local mt = {};

	function mt.__index(f, upvalue)

		local i, name, value = 0;

		repeat

			i = i + 1;

			name, value = debug.getupvalue(f, i);

		until name == upvalue or name == nil;

		return value;

	end

	function mt.__newindex(f, upvalue, value)

		local i, name = 0;

		repeat

			i = i + 1;

			name = debug.getupvalue(f, i);

		until name == upvalue or name == nil;

		if name then

			debug.setupvalue(f, i, value);

		end

	end

	function mt.__tostring(f)

		local info = debug.getinfo(f);

		return ("function(%s:%d)"):format(info.short_src:match("[^\\/]*$"), info.linedefined);

	end

	debug.setmetatable(function() end, mt);

end

function init_global_state()

	-- COMPAT: These globals are deprecated

	bare_sessions = {};

	full_sessions = {};

	hosts = {};

	prosody.bare_sessions = bare_sessions;

	prosody.full_sessions = full_sessions;

	prosody.hosts = hosts;

	local data_path = config.get("*", "data_path") or CFG_DATADIR or "data";

	local custom_plugin_paths = config.get("*", "plugin_paths");

	if custom_plugin_paths then

		local path_sep = package.config:sub(3,3);

		-- path1;path2;path3;defaultpath...

		CFG_PLUGINDIR = table.concat(custom_plugin_paths, path_sep)..path_sep..(CFG_PLUGINDIR or "plugins");

	end

	prosody.paths = { source = CFG_SOURCEDIR, config = CFG_CONFIGDIR or ".", 

	                  plugins = CFG_PLUGINDIR or "plugins", data = data_path };

	prosody.arg = _G.arg;

	prosody.platform = "unknown";

	if os.getenv("WINDIR") then

		prosody.platform = "windows";

	elseif package.config:sub(1,1) == "/" then

		prosody.platform = "posix";

	end

	prosody.installed = nil;

	if CFG_SOURCEDIR and (prosody.platform == "windows" or CFG_SOURCEDIR:match("^/")) then

		prosody.installed = true;

	end

	if prosody.installed then

		-- Change working directory to data path.

		require "lfs".chdir(data_path);

	end

	-- Function to reload the config file

	function prosody.reload_config()

		log("info", "Reloading configuration file");

		prosody.events.fire_event("reloading-config");

		local ok, level, err = config.load((rawget(_G, "CFG_CONFIGDIR") or ".").."/prosody.cfg.lua");

		if not ok then

			if level == "parser" then

				log("error", "There was an error parsing the configuration file: %s", tostring(err));

			elseif level == "file" then

				log("error", "Couldn't read the config file when trying to reload: %s", tostring(err));

			end

		end

		return ok, (err and tostring(level)..": "..tostring(err)) or nil;

	end

	-- Function to reopen logfiles

	function prosody.reopen_logfiles()

		log("info", "Re-opening log files");

		prosody.events.fire_event("reopen-log-files");

	end

	-- Function to initiate prosody shutdown

	function prosody.shutdown(reason)

		log("info", "Shutting down: %s", reason or "unknown reason");

		prosody.shutdown_reason = reason;

		prosody.events.fire_event("server-stopping", {reason = reason});

		server.setquitting(true);

	end

	-- Load SSL settings from config, and create a ctx table

	local certmanager = require "core.certmanager";

	local global_ssl_ctx = certmanager.create_context("*", "server");

	prosody.global_ssl_ctx = global_ssl_ctx;

end

function read_version()

	-- Try to determine version

	local version_file = io.open((CFG_SOURCEDIR or ".").."/prosody.version");

	if version_file then

		prosody.version = version_file:read("*a"):gsub("%s*$", "");

		version_file:close();

		if #prosody.version == 12 and prosody.version:match("^[a-f0-9]+$") then

			prosody.version = "hg:"..prosody.version;

		end

	else

		prosody.version = "unknown";

	end

end

function load_secondary_libraries()

	--- Load and initialise core modules

	require "util.import"

	require "util.xmppstream"

	require "core.stanza_router"

	require "core.hostmanager"

	require "core.portmanager"

	require "core.modulemanager"

	require "core.usermanager"

	require "core.rostermanager"

	require "core.sessionmanager"

	package.loaded['core.componentmanager'] = setmetatable({},{__index=function()

		log("warn", "componentmanager is deprecated: %s", debug.traceback():match("\n[^\n]*\n[ \t]*([^\n]*)"));

		return function() end

	end});

	require "net.http"

	require "util.array"

	require "util.datetime"

	require "util.iterators"

	require "util.timer"

	require "util.helpers"

	pcall(require, "util.signal") -- Not on Windows

	-- Commented to protect us from 

	-- the second kind of people

	--[[ 

	pcall(require, "remdebug.engine");

	if remdebug then remdebug.engine.start() end

	]]

	require "util.stanza"

	require "util.jid"

end

function init_data_store()

	require "core.storagemanager";

end

function prepare_to_start()

	log("info", "Prosody is using the %s backend for connection handling", server.get_backend());

	-- Signal to modules that we are ready to start

	prosody.events.fire_event("server-starting");

	prosody.start_time = os.time();

end	

function init_global_protection()

	-- Catch global accesses

	local locked_globals_mt = {

		__index = function (t, k) log("warn", "%s", debug.traceback("Attempt to read a non-existent global '"..tostring(k).."'", 2)); end;

		__newindex = function (t, k, v) error("Attempt to set a global: "..tostring(k).." = "..tostring(v), 2); end;

	};

	function prosody.unlock_globals()

		setmetatable(_G, nil);

	end

	function prosody.lock_globals()

		setmetatable(_G, locked_globals_mt);

	end

	-- And lock now...

	prosody.lock_globals();

end

function loop()

	-- Error handler for errors that make it this far

	local function catch_uncaught_error(err)

		if type(err) == "string" and err:match("interrupted!$") then

			return "quitting";

		end

		log("error", "Top-level error, please report:\n%s", tostring(err));

		local traceback = debug.traceback("", 2);

		if traceback then

			log("error", "%s", traceback);

		end

		prosody.events.fire_event("very-bad-error", {error = err, traceback = traceback});

	end

	while select(2, xpcall(server.loop, catch_uncaught_error)) ~= "quitting" do

		socket.sleep(0.2);

	end

end

function cleanup()

	log("info", "Shutdown status: Cleaning up");

	prosody.events.fire_event("server-cleanup");

end

-- Are you ready? :)

-- These actions are in a strict order, as many depend on

-- previous steps to have already been performed

read_config();

init_logging();

sanity_check();

sandbox_require();

set_function_metatable();

load_libraries();

init_global_state();

read_version();

log("info", "Hello and welcome to Prosody version %s", prosody.version);

log_dependency_warnings();

load_secondary_libraries();

init_data_store();

init_global_protection();

prepare_to_start();

prosody.events.fire_event("server-started");