functions.php

<?php
	require_once "config.php";
	require_once "version.php";
	require_once "message_types.php";
	require_once "db-prefs.php";

	define('SINGLE_USER_MODE', false);

	$url_regex = "((((new|(ht|f)tp)s?://)?([a-zA-Z+0-9_-]+:[a-zA-Z+0-9_-]+\\@)?((www|ftp|[a-zA-Z+0-9]+(-\\+[a-zA-Z+0-9])*)\\.)?)([a-zA-Z+0-9]+(\\-+[a-zA-Z+0-9]+)*\\.)+[a-zA-Z+]{2,7}(:\\d+)?(/~[a-zA-Z+0-9_%\\-]+)?(/[a-zA-Z+0-9_%.-]+(?=/))*(/[a-zA-Z+0-9_%-]+(\\.[a-zA-Z+0-9]+)?(\\#[a-zA-Z+0-9_.]+)?)*(\\?([a-zA-Z+0-9_.%-]+)=[a-zA-Z+0-9_.%/-]*)?(&([a-zA-Z+0-9_.%-]+)=[a-zA-Z+0-9_.%/-]*)*/?)";


	if (DB_TYPE == "pgsql") {
		define('SUBSTRING_FOR_DATE', 'SUBSTRING_FOR_DATE');
	} else {
		define('SUBSTRING_FOR_DATE', 'SUBSTRING');
	}

	function get_translations() {
		$tr = array(
					"auto"  => "Detect automatically",					
					"en_US" => "English", 
					"xx_XX" => "Bork bork bork!");

		return $tr;
	}

	if (ENABLE_TRANSLATIONS == true) { // If translations are enabled.
		require_once "lib/accept-to-gettext.php";
		require_once "lib/gettext/gettext.inc";

		function startup_gettext() {
	
			# Get locale from Accept-Language header
			$lang = al2gt(array_keys(get_translations()), "text/html");

			if (defined('_TRANSLATION_OVERRIDE_DEFAULT')) {
				$lang = _TRANSLATION_OVERRIDE_DEFAULT;
			}

			if ($_COOKIE["ttirc_lang"] && $_COOKIE["ttirc_lang"] != "auto") {				
				$lang = $_COOKIE["ttirc_lang"];
			}

			/* In login action of mobile version */
			if ($_POST["language"] && defined('MOBILE_VERSION')) {
				$lang = $_POST["language"];
				$_COOKIE["ttirc_lang"] = $lang;
			}

			if ($lang) {
				if (defined('LC_MESSAGES')) {
					_setlocale(LC_MESSAGES, $lang);
				} else if (defined('LC_ALL')) {
					_setlocale(LC_ALL, $lang);
				} else {
					die("can't setlocale(): please set ENABLE_TRANSLATIONS to false in config.php");
				}

				if (defined('MOBILE_VERSION')) {
					_bindtextdomain("messages", "../locale");
				} else {
					_bindtextdomain("messages", "locale");
				}

				_textdomain("messages");
				_bind_textdomain_codeset("messages", "UTF-8");
			}
		}

		startup_gettext();

	} else { // If translations are enabled.
		function __($msg) {
			return $msg;
		}
		function startup_gettext() {
			// no-op
			return true;
		}
	} // If translations are enabled.

	require_once "errors.php";

	function init_connection($link) {

		if (!$link) {
			if (DB_TYPE == "mysql") {
			print mysql_error();
		}
		// PG seems to display its own errors just fine by default.		
			die("Connection failed.");
		}

		if (DB_TYPE == "pgsql") {
			pg_query($link, "set client_encoding = 'UTF-8'");
			pg_set_client_encoding("UNICODE");
			pg_query($link, "set datestyle = 'ISO, european'");
		} else {
			if (defined('MYSQL_CHARSET') && MYSQL_CHARSET) {
				db_query($link, "SET NAMES " . MYSQL_CHARSET);
	//			db_query($link, "SET CHARACTER SET " . MYSQL_CHARSET);
			}
		}
	}

	// from http://developer.apple.com/internet/safari/faq.html
	function no_cache_incantation() {
		header("Expires: Mon, 22 Dec 1980 00:00:00 GMT"); // Happy birthday to me :)
		header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); // always modified
		header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0"); // HTTP/1.1
		header("Cache-Control: post-check=0, pre-check=0", false);
		header("Pragma: no-cache"); // HTTP/1.0
	}

	function login_sequence($link, $mobile = false) {

		$_SESSION["prefs_cache"] = array();

		if (!SINGLE_USER_MODE) {

			$login_action = $_POST["login_action"];

			# try to authenticate user if called from login form			
			if ($login_action == "do_login") {
				$login = $_POST["login"];
				$password = $_POST["password"];
				$remember_me = $_POST["remember_me"];

				if (authenticate_user($link, $login, $password)) {
					$_POST["password"] = "";

					$_SESSION["language"] = $_POST["language"];
					$_SESSION["ref_schema_version"] = get_schema_version($link, true);
					$_SESSION["bw_limit"] = !!$_POST["bw_limit"];

					header("Location: " . $_SERVER["REQUEST_URI"]);
					exit;

					return;
				} else {
					$_SESSION["login_error_msg"] = __("Incorrect username or password");
				}
			}

			if (!$_SESSION["uid"] || !validate_session($link)) {
				render_login_form($link, $mobile);
				//header("Location: login.php");
				exit;
			} else {
				/* bump login timestamp */
				db_query($link, "UPDATE ttirc_users SET last_login = NOW() WHERE id = " . 
					$_SESSION["uid"]);

				if ($_SESSION["language"] && SESSION_COOKIE_LIFETIME > 0) {
					setcookie("ttirc_lang", $_SESSION["language"], 
						time() + SESSION_COOKIE_LIFETIME);
				}

				/* Enable automatic connections */

				db_query($link, "UPDATE ttirc_connections SET enabled = true 
					WHERE auto_connect = true AND owner_uid = " . $_SESSION["uid"]);

				initialize_user_prefs($link, $_SESSION["uid"]);

/*				$tmp_result = db_query($link, "SELECT id FROM ttirc_connections
					WHERE status != ".CS_DISCONNECTED." AND owner_uid = " .
					$_SESSION["uid"]);
	
				while ($conn = db_fetch_assoc($tmp_result)) {
					push_message($link, $conn['id'], "---",
						"Accepted connection from " . $_SERVER["REMOTE_ADDR"], 
						true);
				} */
			}

		} else {
			return authenticate_user($link, "admin", null);
		}
	}

	function render_login_form($link, $mobile = 0) {
		switch ($mobile) {
		case 0:
			require_once "login_form.php";
			break;
		case 1:
			require_once "mobile/login_form.php";
			break;
		case 2:
			require_once "mobile/classic/login_form.php";
		}
	}

	function print_select($id, $default, $values, $attributes = "") {
		print "<select name=\"$id\" id=\"$id\" $attributes>";
		foreach ($values as $v) {
			if ($v == $default)
				$sel = " selected";
			 else
			 	$sel = "";
			
			print "<option$sel>$v</option>";
		}
		print "</select>";
	}

	function print_select_hash($id, $default, $values, $attributes = "") {
		print "<select name=\"$id\" id='$id' $attributes>";
		foreach (array_keys($values) as $v) {
			if ($v == $default)
				$sel = 'selected="selected"';
			 else
			 	$sel = "";
			
			print "<option $sel value=\"$v\">".$values[$v]."</option>";
		}

		print "</select>";
	}

	function encrypt_password($pass, $login = '') {
		if ($login) {
			return "SHA1X:" . sha1("$login:$pass");
		} else {
			return "SHA1:" . sha1($pass);
		}
	} // function encrypt_password

	function authenticate_user($link, $login, $password, $force_auth = false) {

		if (!SINGLE_USER_MODE) {

			$pwd_hash1 = encrypt_password($password);
			$pwd_hash2 = encrypt_password($password, $login);
			$login = db_escape_string($login);

			if (defined('ALLOW_REMOTE_USER_AUTH') && ALLOW_REMOTE_USER_AUTH 
					&& $_SERVER["REMOTE_USER"] && $login != "admin") {

				$login = db_escape_string($_SERVER["REMOTE_USER"]);

				$query = "SELECT id,login,access_level,pwd_hash
	            FROM ttirc_users WHERE
					login = '$login'";

			} else {
				$query = "SELECT id,login,access_level,pwd_hash
	            FROM ttirc_users WHERE
					login = '$login' AND (pwd_hash = '$pwd_hash1' OR
						pwd_hash = '$pwd_hash2')";
			}

			$result = db_query($link, $query);
	
			if (db_num_rows($result) == 1) {
				$_SESSION["uid"] = db_fetch_result($result, 0, "id");
				$_SESSION["name"] = db_fetch_result($result, 0, "login");
				$_SESSION["access_level"] = db_fetch_result($result, 0, "access_level");
	
				db_query($link, "UPDATE ttirc_users SET last_login = NOW() WHERE id = " . 
					$_SESSION["uid"]);
	
				$_SESSION["ip_address"] = $_SERVER["REMOTE_ADDR"];
				$_SESSION["pwd_hash"] = db_fetch_result($result, 0, "pwd_hash");
	
				initialize_user_prefs($link, $_SESSION["uid"]);
	
				return true;
			}
	
			return false;

		} else {

			$_SESSION["uid"] = 1;
			$_SESSION["name"] = "admin";

			$_SESSION["ip_address"] = $_SERVER["REMOTE_ADDR"];
	
			initialize_user_prefs($link, $_SESSION["uid"]);
	
			return true;
		}
	}

	function get_schema_version($link, $nocache = false) {
		if (!$_SESSION["schema_version"] || $nocache) {
			$result = db_query($link, "SELECT schema_version FROM ttirc_version");
			$version = db_fetch_result($result, 0, "schema_version");
			$_SESSION["schema_version"] = $version;
			return $version;
		} else {
			return $_SESSION["schema_version"];
		}
	}

	function validate_session($link) {
		if (SINGLE_USER_MODE) { 
			return true;
		}

		if (SESSION_CHECK_ADDRESS && $_SESSION["uid"]) {
			if ($_SESSION["ip_address"]) {
				if ($_SESSION["ip_address"] != $_SERVER["REMOTE_ADDR"]) {
					$_SESSION["login_error_msg"] = __("Session failed to validate (incorrect IP)");
					return false;
				}
			}
		}

		if ($_SESSION["ref_schema_version"] != get_schema_version($link, true)) {
			return false;
		}

		if ($_SESSION["uid"]) {

			$result = db_query($link, 
				"SELECT pwd_hash FROM ttirc_users WHERE id = '".$_SESSION["uid"]."'");

			$pwd_hash = db_fetch_result($result, 0, "pwd_hash");

			if ($pwd_hash != $_SESSION["pwd_hash"]) {
				return false;
			}
		}

		return true;
	}

	function get_script_dt_add() {
		return time();
	}

	function theme_image($link, $filename) {
		if ($link) {
			$theme_path = get_user_theme_path($link);

			if ($theme_path && is_file($theme_path.$filename)) {
				return $theme_path.$filename;
			} else {
				return $filename;
			}
		} else {
			return $filename;
		}
	}

	function get_user_theme($link) {
		$theme_name = get_pref($link, "USER_THEME");
		if (is_dir("themes/$theme_name")) {
			return $theme_name;
		} else {
			return '';
		}
	}

	function get_user_theme_path($link) {
		$theme_name = get_pref($link, "USER_THEME");

		if ($theme_name && is_dir("themes/$theme_name")) {
			$theme_path = "themes/$theme_name/";
		} else {
			$theme_name = '';
		}

		return $theme_path;

	}

	function get_all_themes() {
		$themes = glob("themes/*");

		asort($themes);

		$rv = array();

		foreach ($themes as $t) {
			if (is_file("$t/theme.ini")) {
				$ini = parse_ini_file("$t/theme.ini", true);
				if ($ini['theme']['version'] && !$ini['theme']['disabled']) {
					$entry = array();
					$entry["path"] = $t;
					$entry["base"] = basename($t);
					$entry["name"] = $ini['theme']['name'];
					$entry["version"] = $ini['theme']['version'];
					$entry["author"] = $ini['theme']['author'];
					$entry["options"] = $ini['theme']['options'];
					array_push($rv, $entry);
				}
			}
		}

		return $rv;
	}

	function logout_user() {
		session_destroy();
		if (isset($_COOKIE[session_name()])) {
		   setcookie(session_name(), '', time()-42000, '/');
		}
	}

	function format_warning($msg, $id = "") {
		global $link;
		return "<div class=\"warning\" id=\"$id\"> 
			<img src=\"".theme_image($link, "images/sign_excl.png")."\">$msg</div>";
	}

	function format_notice($msg) {
		global $link;
		return "<div class=\"notice\" id=\"$id\"> 
			<img src=\"".theme_image($link, "images/sign_info.png")."\">$msg</div>";
	}

	function format_error($msg) {
		global $link;
		return "<div class=\"error\" id=\"$id\"> 
			<img src=\"".theme_image($link, "images/sign_excl.png")."\">$msg</div>";
	}

	function print_notice($msg) {
		return print format_notice($msg);
	}

	function print_warning($msg) {
		return print format_warning($msg);
	}

	function print_error($msg) {
		return print format_error($msg);
	}


	function T_sprintf() {
		$args = func_get_args();
		return vsprintf(__(array_shift($args)), $args);
	}
	
	function _debug($msg) {
		$ts = strftime("%H:%M:%S", time());
		if (function_exists('posix_getpid')) {
			$ts = "$ts/" . posix_getpid();
		}
		print "[$ts] $msg\n";
	} // function _debug

	function file_is_locked($filename) {
		if (function_exists('flock')) {
			error_reporting(0);
			$fp = fopen(LOCK_DIRECTORY . "/$filename", "r");
			error_reporting(DEFAULT_ERROR_LEVEL);
			if ($fp) {
				if (flock($fp, LOCK_EX | LOCK_NB)) {
					flock($fp, LOCK_UN);
					fclose($fp);
					return false;
				}
				fclose($fp);
				return true;
			} else {
				return false;
			}
		}
		return true; // consider the file always locked and skip the test
	}

	function make_lockfile($filename) {
		$fp = fopen(LOCK_DIRECTORY . "/$filename", "w");

		if (flock($fp, LOCK_EX | LOCK_NB)) {		
			fwrite($fp, posix_getpid() . "\n");
			return $fp;
		} else {
			return false;
		}
	}

	# TODO return actual nick, not hardcoded one
	function get_nick($link, $connection_id) {
		$result = db_query($link, "SELECT active_nick FROM ttirc_connections
			WHERE id ='$connection_id'");

		if (db_num_rows($result) == 1) {
			return db_fetch_result($result, 0, "active_nick");
		} else {
			return "?UNKNOWN?";
		}
	}

	function handle_command($link, $connection_id, $channel, $message) {

		$keywords = array();

		preg_match("/^\/([^ ]+) ?(.*)$/", $message, $keywords);

		$command = trim(strtolower($keywords[1]));
		$arguments = trim($keywords[2]);

		if ($command == "j") $command = "join";
		
		if ($command == "me") {
			$command = "action";
			push_message($link, $connection_id, $channel,
				"$arguments", true, MSGT_ACTION);
		}

		if ($command == "notice") {
			list ($nick, $message) = explode(" ", $arguments, 2);
			push_message($link, $connection_id, $channel,
				"$message", false, MSGT_NOTICE, $nick);
		}

		switch ($command) {
		case "query":

			db_query($link, "BEGIN");

			$result = db_query($link, "SELECT id FROM ttirc_channels WHERE
				channel = '$arguments' AND connection_id = '$connection_id'");

			if (db_num_rows($result) == 0) {
				db_query($link, "INSERT INTO ttirc_channels 
					(channel, connection_id, chan_type) VALUES
					('$arguments', '$connection_id', '".CT_PRIVATE."')");
			}

			db_query($link, "COMMIT");

			break;
		case "part":
			
			if (!$arguments) $arguments = $channel;

			db_query($link, "BEGIN");

			$result = db_query($link, "SELECT chan_type FROM ttirc_channels WHERE
				channel = '$arguments' AND connection_id = '$connection_id'");

			if (db_num_rows($result) != 0) {
				$chan_type = db_fetch_result($result, 0, "chan_type");

				if ($chan_type == CT_PRIVATE) {
					db_query($link, "DELETE FROM ttirc_channels WHERE
						channel = '$arguments' AND connection_id = '$connection_id'");
				} else {
					push_message($link, $connection_id, $channel,
						"$command:$arguments", false, MSGT_COMMAND);
				}
			}

			db_query($link, "COMMIT");

			break;
		default:
			push_message($link, $connection_id, $channel,
				"$command:$arguments", false, MSGT_COMMAND);
			break;
		}

		return $last_id;
	}


	function push_message($link, $connection_id, $channel, $message, 
		$incoming = false, $message_type = MSGT_PRIVMSG, $from_nick = false) {

		if (!$message) return false;

		$incoming = bool_to_sql_bool($incoming);

		if ($channel != "---") {
			$my_nick = get_nick($link, $connection_id);
		} else {
			$my_nick = "---";
		}

		if ($from_nick) $my_nick = $from_nick;

		//$message = db_escape_string($message);

		$result = db_query($link, "INSERT INTO ttirc_messages 
			(incoming, connection_id, channel, sender, message, message_type) VALUES
			($incoming, $connection_id, '$channel', '$my_nick', '$message', 
			'$message_type')");
	}

	function num_new_lines($link, $last_id) {

		$result = db_query($link, "SELECT COUNT(*) AS cl
			FROM ttirc_messages, ttirc_connections WHERE
			connection_id = ttirc_connections.id AND
			message_type != ".MSGT_COMMAND." AND
			ts > NOW() - INTERVAL '15 minutes' AND
			ttirc_messages.id > '$last_id' AND 
			owner_uid = ".$_SESSION["uid"]);

		return db_fetch_result($result, 0, "cl");
	}

	function get_new_lines($link, $last_id) {

		$result = db_query($link, "SELECT ttirc_messages.id,
			message_type, sender, channel, connection_id, incoming,
			message, ".SUBSTRING_FOR_DATE."(ts,12,8) AS ts
			FROM ttirc_messages, ttirc_connections WHERE
			connection_id = ttirc_connections.id AND
			message_type != ".MSGT_COMMAND." AND
			((ts > NOW() - INTERVAL '15 minutes' AND 
				message_type != ".MSGT_PRIVATE_PRIVMSG.") OR
			(ts > NOW() - INTERVAL '5 hours' AND 
				message_type = ".MSGT_PRIVATE_PRIVMSG.")) AND
			ttirc_messages.id > '$last_id' AND 
			owner_uid = ".$_SESSION["uid"]." ORDER BY ttirc_messages.id LIMIT 50");

		$lines = array();

		while ($line = db_fetch_assoc($result)) {
			$line["message"] = rewrite_urls(htmlspecialchars($line["message"]));
			$line["sender_color"] = color_of($line["sender"]);
			$line["incoming"] = sql_bool_to_bool($line["incoming"]);
			array_push($lines, $line);
		}

		return $lines;

	}

	function get_chan_data($link, $active_chan = false) {

		if ($active_chan && $active_chan != "---") {
			$active_chan_qpart = "channel = '$active_chan' AND";
		} else {
			$active_chan_qpart = "";
		}

		$result = db_query($link, "SELECT nicklist,channel,connection_id,
			chan_type,topic,
			topic_owner,".SUBSTRING_FOR_DATE."(topic_set,1,16) AS topic_set
			FROM ttirc_channels, ttirc_connections 
			WHERE connection_id = ttirc_connections.id AND 
			$active_chan_qpart
			owner_uid = ".$_SESSION["uid"]);

		$rv = array();

		while ($line = db_fetch_assoc($result)) {
			$chan = $line["channel"];

			$re = array();

			$re["chan_type"] = $line["chan_type"];
			$re["users"] = json_decode($line["nicklist"]);
			$re["topic"] = array(
				$line["topic"], $line["topic_owner"], $line["topic_set"]);

			$rv[$line["connection_id"]][$chan] = $re;
		}

		return $rv;
	}

	function get_conn_info($link) {

		$result = db_query($link, "SELECT id,active_server,active_nick,status,
			title,userhosts
			FROM ttirc_connections
			WHERE visible = true AND owner_uid = ".$_SESSION["uid"]);
	
		$conn = array();

		while ($line = db_fetch_assoc($result)) {
			if ($line['userhosts']) $line['userhosts'] = json_decode($line['userhosts']);
			array_push($conn, $line);
		}

		return $conn;

	}

	function sql_bool_to_string($s) {
		if ($s == "t" || $s == "1") {
			return "true";
		} else {
			return "false";
		}
	}

	function sql_bool_to_bool($s) {
		if ($s == "t" || $s == "1") {
			return true;
		} else {
			return false;
		}
	}
	
	function bool_to_sql_bool($s) {
		if ($s) {
			return "true";
		} else {
			return "false";
		}
	}

	function sanity_check($link) {

		global $ERRORS;

		error_reporting(0);

		$error_code = 0;
		$schema_version = get_schema_version($link);

		if ($schema_version != SCHEMA_VERSION) {
			$error_code = 5;
		}

		if (DB_TYPE == "mysql") {
			$result = db_query($link, "SELECT true", false);
			if (db_num_rows($result) != 1) {
				$error_code = 10;
			}
		}

		if (db_escape_string("testTEST") != "testTEST") {
			$error_code = 12;
		}

		error_reporting (DEFAULT_ERROR_LEVEL);

		$result = db_query($link, "SELECT value FROM ttirc_system WHERE
			key = 'MASTER_RUNNING'");

		$master_running = db_fetch_result($result, 0, "value") == "true";

		if (!$master_running) {
			$error_code = 13;
		}

		if ($error_code != 0) {
			print json_encode(array("error" => $error_code, 
				"errormsg" => $ERRORS[$error_code]));
			return false;
		} else {
			return true;
		}
	}

	function get_random_server($link, $connection_id) {
		$result = db_query($link, "SELECT * FROM ttirc_servers WHERE
			connection_id = '$connection_id' ORDER BY RANDOM() LIMIT 1");

		if (db_num_rows($result) != 0) {
			return db_fetch_assoc($result);
		} else {
			return false;
		}

	}

	// shamelessly stolen from xchat source code

	function color_of($name) {

		$rcolors = array( 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
		  13, 14, 15 );

		$i = 0;
		$sum = 0;

		for ($i = 0; $i < strlen($name); $i++) {
			$sum += ord($name{$i});
		}

		$sum %= count($rcolors);

		return $rcolors[$sum];
	}

	function purge_old_lines($link) {
		db_query($link, "DELETE FROM ttirc_messages WHERE
			ts < NOW() - INTERVAL '3 hours'");
	}

	function update_heartbeat($link) {

		if (time() - $_SESSION["heartbeat_last"] > 120) {
			$result = db_query($link, "UPDATE ttirc_users SET heartbeat = NOW()
				WHERE id = " . $_SESSION["uid"]);
			$_SESSION["heartbeat_last"] = time();
		}
	}

	function initialize_user_prefs($link, $uid, $profile = false) {

		$uid = db_escape_string($uid);

		if (!$profile) {
			$profile = "NULL";
			$profile_qpart = "AND profile IS NULL";
		} else {
			$profile_qpart = "AND profile = '$profile'";
		}

		db_query($link, "BEGIN");

		$result = db_query($link, "SELECT pref_name,def_value FROM ttirc_prefs");
		
		$u_result = db_query($link, "SELECT pref_name 
			FROM ttirc_user_prefs WHERE owner_uid = '$uid' $profile_qpart");

		$active_prefs = array();

		while ($line = db_fetch_assoc($u_result)) {
			array_push($active_prefs, $line["pref_name"]);			
		}

		while ($line = db_fetch_assoc($result)) {
			if (array_search($line["pref_name"], $active_prefs) === FALSE) {
//				print "adding " . $line["pref_name"] . "<br>";

				if (get_schema_version($link) < 63) {
					db_query($link, "INSERT INTO ttirc_user_prefs
						(owner_uid,pref_name,value) VALUES 
						('$uid', '".$line["pref_name"]."','".$line["def_value"]."')");

				} else {
					db_query($link, "INSERT INTO ttirc_user_prefs
						(owner_uid,pref_name,value, profile) VALUES 
						('$uid', '".$line["pref_name"]."','".$line["def_value"]."', $profile)");
				}

			}
		}

		db_query($link, "COMMIT");

	}

	function valid_connection($link, $id) {
		$result = db_query($link, "SELECT id FROM ttirc_connections
			WHERE id = '$id' AND owner_uid = "  . $_SESSION["uid"]);
		return db_num_rows($result) == 1;
	}

	function make_password($length = 8) {

		$password = "";
		$possible = "0123456789abcdfghjkmnpqrstvwxyzABCDFGHJKMNPQRSTVWXYZ"; 
		
   	$i = 0; 
    
		while ($i < $length) { 
			$char = substr($possible, mt_rand(0, strlen($possible)-1), 1);
        
			if (!strstr($password, $char)) { 
				$password .= $char;
				$i++;
			}
		}
		return $password;
	}

	function rewrite_urls($line) {
		global $url_regex;

		$urls = null;

		$result = preg_replace("/(([a-z]+):\/\/[^ ]+)/i", 
			"<a target=\"_blank\" onclick=\"return m_c(this)\" onmouseover=\"m_i(this)\" onmouseout=\"m_o(this)\"
			href=\"\\1\">\\1</a>", $line);

		return $result;
	}

	function get_user_login($link, $id) {
		$result = db_query($link, "SELECT login FROM ttirc_users WHERE id = '$id'");

		if (db_num_rows($result) == 1) {
			return db_fetch_result($result, 0, "login");
		} else {
			return false;
		}

	}

	function get_iconv_encodings() {
		return explode("\n", file_get_contents("lib/iconv.txt"));
	}

	function print_theme_select($link) {
		$user_theme = get_pref($link, "USER_THEME");
		$themes = get_all_themes();

		print "<select name=\"theme\">";
		print "<option value=''>".__('Default')."</option>";
		print "<option disabled>--------</option>";				

		foreach ($themes as $t) {
			$base = $t['base'];
			$name = $t['name'];

			if ($base == $user_theme) {
				$selected = "selected=\"1\"";
			} else {
				$selected = "";
			}

			print "<option $selected value='$base'>$name</option>";

		}

		print "</select>";
	}

	function print_user_css($link) {
		$user_css = get_pref($link, "USER_STYLESHEET");

		if ($user_css) {
			print "<style type=\"text/css\">$user_css</style>";
		}
	}

	function get_misc_params($link) {
		$notify_on = json_decode(get_pref($link, "NOTIFY_ON"));

		if (!is_array($notify_on)) $notify_on = array();

		$notify_events = array();

		foreach ($notify_on as $no) {
			$notify_events[$no] = true;
		}

		$rv = array(
			"highlight_on" => explode(",", get_pref($link, "HIGHLIGHT_ON")),
			"notify_events" => $notify_events);

		return $rv;
	}
?>