#!/usr/bin/env lua

-- Prosody IM

-- Copyright (C) 2008-2009 Matthew Wild

-- Copyright (C) 2008-2009 Waqas Hussain

-- 

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

-- 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");

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

if CFG_SOURCEDIR then

	package.path = CFG_SOURCEDIR.."/?.lua;"..package.path;

	package.cpath = CFG_SOURCEDIR.."/?.so;"..package.cpath;

end

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

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

if CFG_DATADIR then

	if os.getenv("HOME") then

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

	end

end

-- Required to be able to find packages installed with luarocks

pcall(require, "luarocks.require")

-- Replace require with one that doesn't pollute _G

do

	local _realG = _G;

	local _real_require = require;

	function require(...)

		local curr_env = getfenv(2);

		local curr_env_mt = getmetatable(getfenv(2));

		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_newindex, _realG_mt.__newindex = _realG_mt.__newindex, curr_env;

			local ret = _real_require(...);

			_realG_mt.__newindex = old_newindex;

			return ret;

		end

		return _real_require(...);

	end

end

config = require "core.configmanager"

function read_config()

	-- TODO: Check for other formats when we add support for them

	-- Use lfs? Make a new conf/ dir?

	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

	else

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

	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");

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

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

			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()

	-- Initialize logging

	require "core.loggingmanager"

	-- Check runtime dependencies

	require "util.dependencies"

	-- Load socket framework

	server = require "net.server"

end	

function init_global_state()

	bare_sessions = {};

	full_sessions = {};

	hosts = {};

	-- Global 'prosody' object

	prosody = {};

	local prosody = prosody;

	prosody.bare_sessions = bare_sessions;

	prosody.full_sessions = full_sessions;

	prosody.hosts = hosts;

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

	                  plugins = CFG_PLUGINDIR, data = CFG_DATADIR };

	prosody.arg = _G.arg;

	prosody.events = require "util.events".new();

	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

	-- 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");

		eventmanager.fire_event("reopen-log-files"); -- Handled by appropriate log sinks

		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 global_ssl_ctx = rawget(_G, "ssl") and config.get("*", "core", "ssl");

	if global_ssl_ctx then

		local default_ssl_ctx = { mode = "server", protocol = "sslv23", capath = "/etc/ssl/certs", verify = "none"; };

		setmetatable(global_ssl_ctx, { __index = default_ssl_ctx });

	end

	local cl = require "net.connlisteners";

	function prosody.net_activate_ports(option, listener, default, conntype)

		conntype = conntype or (global_ssl_ctx and "tls") or "tcp";

		if not cl.get(listener) then return; end

		local ports = config.get("*", "core", option.."_ports") or default;

		if type(ports) == "number" then ports = {ports} end;

		if type(ports) ~= "table" then

			log("error", "core."..option.." is not a table");

		else

			for _, port in ipairs(ports) do

				if type(port) ~= "number" then

					log("error", "Non-numeric "..option.."_ports: "..tostring(port));

				else

					cl.start(listener, { 

						ssl = conntype ~= "tcp" and global_ssl_ctx,

						port = port,

						interface = config.get("*", "core", option.."_interface") 

							or cl.get(listener).default_interface 

							or config.get("*", "core", "interface"),

						type = conntype

					});

				end

			end

		end

	end

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 "core.xmlhandlers"

	require "core.rostermanager"

	require "core.eventmanager"

	require "core.hostmanager"

	require "core.modulemanager"

	require "core.usermanager"

	require "core.sessionmanager"

	require "core.stanza_router"

	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 "net.connlisteners";

	require "util.stanza"

	require "util.jid"

end

function init_data_store()

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

	require "util.datamanager".set_data_path(data_path);

	require "util.datamanager".add_callback(function(username, host, datastore, data)

		if config.get(host, "core", "anonymous_login") then

			return false;

		end

		return username, host, datastore, data;

	end);

end

function prepare_to_start()

	-- Signal to modules that we are ready to start

	eventmanager.fire_event("server-starting");

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

	-- start listening on sockets

	prosody.net_activate_ports("c2s", "xmppclient", {5222});

	prosody.net_activate_ports("s2s", "xmppserver", {5269});

	prosody.net_activate_ports("component", "xmppcomponent", {}, "tcp");

	prosody.net_activate_ports("legacy_ssl", "xmppclient", {}, "ssl");

	prosody.start_time = os.time();

end	

function init_global_protection()

	-- Catch global accesses --

	local locked_globals_mt = { __index = function (t, k) error("Attempt to read a non-existent global '"..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("%d*: 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");

	-- Ok, we're quitting I know, but we

	-- need to do some tidying before we go :)

	server.setquitting(false);

	log("info", "Shutdown status: Closing all active sessions");

	for hostname, host in pairs(hosts) do

		log("debug", "Shutdown status: Closing client connections for %s", hostname)

		if host.sessions then

			local reason = { condition = "system-shutdown", text = "Server is shutting down" };

			if prosody.shutdown_reason then

				reason.text = reason.text..": "..prosody.shutdown_reason;

			end

			for username, user in pairs(host.sessions) do

				for resource, session in pairs(user.sessions) do

					log("debug", "Closing connection for %s@%s/%s", username, hostname, resource);

					session:close(reason);

				end

			end

		end

		log("debug", "Shutdown status: Closing outgoing s2s connections from %s", hostname);

		if host.s2sout then

			for remotehost, session in pairs(host.s2sout) do

				if session.close then

					session:close("system-shutdown");

				else

					log("warn", "Unable to close outgoing s2s session to %s, no session:close()?!", remotehost);

				end

			end

		end

	end

	log("info", "Shutdown status: Closing all server connections");

	server.closeall();

	server.setquitting(true);

end

read_config();

load_libraries();

init_global_state();

read_version();

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

load_secondary_libraries();

init_data_store();

init_global_protection();

prepare_to_start();

eventmanager.fire_event("server-started");

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

loop();

log("info", "Shutting down...");

cleanup();

eventmanager.fire_event("server-stopped");

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

log("info", "Shutdown complete");