#!/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.
--

-- prosodyctl - command-line controller for Prosody XMPP server

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

CFG_SOURCEDIR='/usr/local/lib/prosody';
CFG_CONFIGDIR='/etc/prosody';
CFG_PLUGINDIR='/usr/local/lib/prosody/modules/';
CFG_DATADIR='/var/prosody';

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

if CFG_SOURCEDIR then
	package.path = CFG_SOURCEDIR.."/?.lua;"..package.path
	package.cpath = CFG_SOURCEDIR.."/?.so;"..package.cpath
end

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

config = require "core.configmanager"

do
	-- TODO: Check for other formats when we add support for them
	-- Use lfs? Make a new conf/ dir?
	local ok, level, err = config.load((CFG_CONFIGDIR or ".").."/prosody.cfg.lua");
	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

require "core.loggingmanager"

if not require "util.dependencies".check_dependencies() then
	os.exit(1);
end

prosody = { hosts = {}, events = events, platform = "posix" };

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

-- Switch away from root and into the prosody user --
local switched_user, current_uid;

local want_pposix_version = "0.3.3";
local ok, pposix = pcall(require, "util.pposix");

if ok and pposix then
	if pposix._VERSION ~= want_pposix_version then print(string.format("Unknown version (%s) of binary pposix module, expected %s", tostring(pposix._VERSION), want_pposix_version)); return; end
	current_uid = pposix.getuid();
	if current_uid == 0 then
		-- We haz root!
		local desired_user = config.get("*", "core", "prosody_user") or "prosody";
		local desired_group = config.get("*", "core", "prosody_group") or desired_user;
		local ok, err = pposix.setgid(desired_group);
		if ok then
			ok, err = pposix.setuid(desired_user);
			if ok then
				-- Yay!
				switched_user = true;
			end
		end
		if not switched_user then
			-- Boo!
			print("Warning: Couldn't switch to Prosody user/group '"..tostring(desired_user).."'/'"..tostring(desired_group).."': "..tostring(err));
		end
	end
	
	-- Set our umask to protect data files
	pposix.umask(config.get("*", "core", "umask") or "027");
else
	print("Error: Unable to load pposix module. Check that Prosody is installed correctly.")
	print("For more help send the below error to us through http://prosody.im/discuss");
	print(tostring(pposix))
end

local error_messages = setmetatable({ 
		["invalid-username"] = "The given username is invalid in a Jabber ID";
		["invalid-hostname"] = "The given hostname is invalid";
		["no-password"] = "No password was supplied";
		["no-such-user"] = "The given user does not exist on the server";
		["unable-to-save-data"] = "Unable to store, perhaps you don't have permission?";
		["no-pidfile"] = "There is no 'pidfile' option in the configuration file, see http://prosody.im/doc/prosodyctl#pidfile for help";
		["no-such-method"] = "This module has no commands";
		["not-running"] = "Prosody is not running";
		}, { __index = function (t,k) return "Error: "..(tostring(k):gsub("%-", " "):gsub("^.", string.upper)); end });

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

hosts = prosody.hosts;

for hostname, config in pairs(config.getconfig()) do
	hosts[hostname] = { events = events };
end
	
require "core.modulemanager"

require "util.prosodyctl"
require "socket"
-----------------------

function show_message(msg, ...)
	print(msg:format(...));
end

function show_warning(msg, ...)
	print(msg:format(...));
end

function show_usage(usage, desc)
	print("Usage: "..arg[0].." "..usage);
	if desc then
		print(" "..desc);
	end
end

local function getchar(n)
	local stty_ret = os.execute("stty raw -echo 2>/dev/null");
	local ok, char;
	if stty_ret == 0 then
		ok, char = pcall(io.read, n or 1);
		os.execute("stty sane");
	else
		ok, char = pcall(io.read, "*l");
		if ok then
			char = char:sub(1, n or 1);
		end
	end
	if ok then
		return char;
	end
end
	
local function getpass()
	local stty_ret = os.execute("stty -echo 2>/dev/null");
	if stty_ret ~= 0 then
		io.write("\027[08m"); -- ANSI 'hidden' text attribute
	end
	local ok, pass = pcall(io.read, "*l");
	if stty_ret == 0 then
		os.execute("stty sane");
	else
		io.write("\027[00m");
	end
	io.write("\n");
	if ok then
		return pass;
	end
end

function show_yesno(prompt)
	io.write(prompt, " ");
	local choice = getchar():lower();
	io.write("\n");
	if not choice:match("%a") then
		choice = prompt:match("%[.-(%U).-%]$");
		if not choice then return nil; end
	end
	return (choice == "y");
end

local function read_password()
	local password;
	while true do
		io.write("Enter new password: ");
		password = getpass();
		if not password then
			show_message("No password - cancelled");
			return;
		end
		io.write("Retype new password: ");
		if getpass() ~= password then
			if not show_yesno [=[Passwords did not match, try again? [Y/n]]=] then
				return;
			end
		else
			break;
		end
	end
	return password;
end

local prosodyctl_timeout = (config.get("*", "core", "prosodyctl_timeout") or 5) * 2;
-----------------------
local commands = {};
local command = arg[1];

function commands.adduser(arg)
	if not arg[1] or arg[1] == "--help" then
		show_usage([[adduser JID]], [[Create the specified user account in Prosody]]);
		return 1;
	end
	local user, host = arg[1]:match("([^@]+)@(.+)");
	if not user and host then
		show_message [[Failed to understand JID, please supply the JID you want to create]]
		show_usage [[adduser user@host]]
		return 1;
	end
	
	if not host then
		show_message [[Please specify a JID, including a host. e.g. alice@example.com]];
		return 1;
	end
	
	if prosodyctl.user_exists{ user = user, host = host } then
		show_message [[That user already exists]];
		return 1;
	end
	
	if not hosts[host] then
		show_warning("The host '%s' is not listed in the configuration file (or is not enabled).", host)
		show_warning("The user will not be able to log in until this is changed.");
	end
	
	local password = read_password();
	if not password then return 1; end
	
	local ok, msg = prosodyctl.adduser { user = user, host = host, password = password };
	
	if ok then return 0; end
	
	show_message(error_messages[msg])
	return 1;
end

function commands.passwd(arg)
	if not arg[1] or arg[1] == "--help" then
		show_usage([[passwd JID]], [[Set the password for the specified user account in Prosody]]);
		return 1;
	end
	local user, host = arg[1]:match("([^@]+)@(.+)");
	if not user and host then
		show_message [[Failed to understand JID, please supply the JID you want to set the password for]]
		show_usage [[passwd user@host]]
		return 1;
	end
	
	if not host then
		show_message [[Please specify a JID, including a host. e.g. alice@example.com]];
		return 1;
	end
	
	if not prosodyctl.user_exists { user = user, host = host } then
		show_message [[That user does not exist, use prosodyctl adduser to create a new user]]
		return 1;
	end
	
	local password = read_password();
	if not password then return 1; end
	
	local ok, msg = prosodyctl.passwd { user = user, host = host, password = password };
	
	if ok then return 0; end
	
	show_message(error_messages[msg])
	return 1;
end

function commands.deluser(arg)
	if not arg[1] or arg[1] == "--help" then
		show_usage([[deluser JID]], [[Permanently remove the specified user account from Prosody]]);
		return 1;
	end
	local user, host = arg[1]:match("([^@]+)@(.+)");
	if not user and host then
		show_message [[Failed to understand JID, please supply the JID you want to set the password for]]
		show_usage [[passwd user@host]]
		return 1;
	end
	
	if not host then
		show_message [[Please specify a JID, including a host. e.g. alice@example.com]];
		return 1;
	end
	
	if not prosodyctl.user_exists { user = user, host = host } then
		show_message [[That user does not exist on this server]]
		return 1;
	end
	
	local ok, msg = prosodyctl.passwd { user = user, host = host };
	
	if ok then return 0; end
	
	show_message(error_messages[msg])
	return 1;
end

function commands.start(arg)
	if arg[1] == "--help" then
		show_usage([[start]], [[Start Prosody]]);
		return 1;
	end
	local ok, ret = prosodyctl.isrunning();
	if not ok then
		show_message(error_messages[ret]);
		return 1;
	end
	
	if ret then
		local ok, ret = prosodyctl.getpid();
		if not ok then
			show_message("Couldn't get running Prosody's PID");
			show_message(error_messages[ret]);
			return 1;
		end
		show_message("Prosody is already running with PID %s", ret or "(unknown)");
		return 1;
	end
	
	local ok, ret = prosodyctl.start();
	if ok then
		if config.get("*", "core", "daemonize") ~= false then
			local i=1;
			while true do
				local ok, running = prosodyctl.isrunning();
				if ok and running then
					break;
				elseif i == 5 then
					show_message("Still waiting...");
				elseif i >= prosodyctl_timeout then
					show_message("Prosody is still not running. Please give it some time or check your log files for errors.");
					return 2;
				end
				socket.sleep(0.5);
				i = i + 1;
			end
			show_message("Started");
		end
		return 0;
	end

	show_message("Failed to start Prosody");
	show_message(error_messages[ret])	
	return 1;	
end

function commands.status(arg)
	if arg[1] == "--help" then
		show_usage([[status]], [[Reports the running status of Prosody]]);
		return 1;
	end

	local ok, ret = prosodyctl.isrunning();
	if not ok then
		show_message(error_messages[ret]);
		return 1;
	end
	
	if ret then
		local ok, ret = prosodyctl.getpid();
		if not ok then
			show_message("Couldn't get running Prosody's PID");
			show_message(error_messages[ret]);
			return 1;
		end
		show_message("Prosody is running with PID %s", ret or "(unknown)");
		return 0;
	else
		show_message("Prosody is not running");
		if not switched_user and current_uid ~= 0 then
			print("\nNote:")
			print(" You will also see this if prosodyctl is not running under");
			print(" the same user account as Prosody. Try running as root (e.g. ");
			print(" with 'sudo' in front) to gain access to Prosody's real status.");
		end
		return 2
	end
	return 1;
end

function commands.stop(arg)
	if arg[1] == "--help" then
		show_usage([[stop]], [[Stop a running Prosody server]]);
		return 1;
	end

	if not prosodyctl.isrunning() then
		show_message("Prosody is not running");
		return 1;
	end
	
	local ok, ret = prosodyctl.stop();
	if ok then
		local i=1;
		while true do
			local ok, running = prosodyctl.isrunning();
			if ok and not running then
				break;
			elseif i == 5 then
				show_message("Still waiting...");
			elseif i >= prosodyctl_timeout then
				show_message("Prosody is still running. Please give it some time or check your log files for errors.");
				return 2;
			end
			socket.sleep(0.5);
			i = i + 1;
		end
		show_message("Stopped");
		return 0;
	end

	show_message(error_messages[ret]);
	return 1;
end

function commands.restart(arg)
	if arg[1] == "--help" then
		show_usage([[restart]], [[Restart a running Prosody server]]);
		return 1;
	end
	
	local ret = commands.stop(arg);
	if ret == 0 then
		ret = commands.start(arg);
	end
	return ret;
end

-- ejabberdctl compatibility

function commands.register(arg)
	local user, host, password = unpack(arg);
	if (not (user and host)) or arg[1] == "--help" then
		if user ~= "--help" then
			if not user then
				show_message [[No username specified]]
			elseif not host then
				show_message [[Please specify which host you want to register the user on]];
			end
		end
		show_usage("register USER HOST [PASSWORD]", "Register a user on the server, with the given password");
		return 1;
	end
	if not password then
		password = read_password();
		if not password then
			show_message [[Unable to register user with no password]];
			return 1;
		end
	end
	
	local ok, msg = prosodyctl.adduser { user = user, host = host, password = password };
	
	if ok then return 0; end
	
	show_message(error_messages[msg])
	return 1;
end

function commands.unregister(arg)
	local user, host = unpack(arg);
	if (not (user and host)) or arg[1] == "--help" then
		if user ~= "--help" then
			if not user then
				show_message [[No username specified]]
			elseif not host then
				show_message [[Please specify which host you want to unregister the user from]];
			end
		end
		show_usage("unregister USER HOST [PASSWORD]", "Permanently remove a user account from the server");
		return 1;
	end

	local ok, msg = prosodyctl.deluser { user = user, host = host };
	
	if ok then return 0; end
	
	show_message(error_messages[msg])
	return 1;
end

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

if command and command:match("^mod_") then -- Is a command in a module
	local module_name = command:match("^mod_(.+)");
	local ret, err = modulemanager.load("*", module_name);
	if not ret then
		show_message("Failed to load module '"..module_name.."': "..err);
		os.exit(1);
	end
	
	table.remove(arg, 1);
	
	local module = modulemanager.get_module("*", module_name);
	if not module then
		show_message("Failed to load module '"..module_name.."': Unknown error");
		os.exit(1);
	end
	
	if not modulemanager.module_has_method(module, "command") then
		show_message("Fail: mod_"..module_name.." does not support any commands");
		os.exit(1);
	end
	
	local ok, ret = modulemanager.call_module_method(module, "command", arg);
	if ok then
		if type(ret) == "number" then
			os.exit(ret);
		elseif type(ret) == "string" then
			show_message(ret);
		end
		os.exit(0); -- :)
	else
		show_message("Failed to execute command: "..error_messages[ret]);
		os.exit(1); -- :(
	end
end

if not commands[command] then -- Show help for all commands
	function show_usage(usage, desc)
		print(" "..usage);
		print("    "..desc);
	end

	print("prosodyctl - Manage a Prosody server");
	print("");
	print("Usage: "..arg[0].." COMMAND [OPTIONS]");
	print("");
	print("Where COMMAND may be one of:\n");

	local hidden_commands = require "util.set".new{ "register", "unregister", "addplugin" };
	local commands_order = { "adduser", "passwd", "deluser", "start", "stop", "restart" };

	local done = {};

	for _, command_name in ipairs(commands_order) do
		local command = commands[command_name];
		if command then
			command{ "--help" };
			print""
			done[command_name] = true;
		end
	end

	for command_name, command in pairs(commands) do
		if not done[command_name] and not hidden_commands:contains(command_name) then
			command{ "--help" };
			print""
			done[command_name] = true;
		end
	end
	
	
	os.exit(0);
end

os.exit(commands[command]({ select(2, unpack(arg)) }));
