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<?php
class Util
{
/**
* Displays an error message and stops script execution.
* If CONFIG_DEBUG is true, it will also dump a stack trace
* and all globally defined variables.
* (As this might reveal sensistive data you should never enable it in production)
*/
public static function traceError($message)
{
Header('Content-Type: text/plain; charset=utf-8');
echo "--------------------\nFlagrant system error:\n$message\n--------------------\n\n";
if (defined('CONFIG_DEBUG') && CONFIG_DEBUG) {
debug_print_backtrace();
echo "\n\nSome variables for your entertainment:\n";
print_r($GLOBALS);
}
exit(0);
}
/**
* Redirects the user via a '302 Moved' header.
* An active session will be saved, any messages that haven't
* been displayed yet will be appended to the redirect.
* @param string $location Location to redirect to. "false" to redirect to same URL (useful after POSTs)
*/
public static function redirect($location = false)
{
if ($location === false) {
$location = preg_replace('/(&|\?)message\[\]\=[^&]*(&|$)/', '\1', $_SERVER['REQUEST_URI']);
}
Session::save();
$messages = Message::toRequest();
if (!empty($messages)) {
if (strpos($location, '?') === false) {
$location .= '?' . $messages;
} else {
$location .= '&' . $messages;
}
}
Header('Location: ' . $location);
exit(0);
}
/**
* Verify the user's token that protects agains CSRF.
* If the user is logged in and there is no token variable set in
* the request, or the submitted token does not match the user's
* token, this function will return false and display an error.
* If the token matches, or the user is not logged in, it will return true.
*/
public static function verifyToken()
{
if (Session::get('token') === false)
return true;
if (isset($_REQUEST['token']) && Session::get('token') === $_REQUEST['token'])
return true;
Message::addError('token');
return false;
}
/**
* Simple markup "rendering":
* *word* is bold
* /word/ is italics
* _word_ is underlined
* \n is line break
*/
public static function markup($string)
{
$string = htmlspecialchars($string);
$string = preg_replace('#(^|[\n \-_/\.])\*(.+?)\*($|[ \-_/\.\!\?,:])#is', '$1<b>$2</b>$3', $string);
$string = preg_replace('#(^|[\n \-\*/\.])_(.+?)_($|[ \-\*/\.\!\?,:])#is', '$1<u>$2</u>$3', $string);
$string = preg_replace('#(^|[\n \-_\*\.])/(.+?)/($|[ \-_\*\.\!\?,:])#is', '$1<i>$2</i>$3', $string);
return nl2br($string);
}
/**
* Convert given number to human readable file size string.
* Will append Bytes, KiB, etc. depending on magnitude of number.
*
* @param type $bytes numeric value of the filesize to make readable
* @param type $decimals number of decimals to show, -1 for automatic
* @return type human readable string representing the given filesize
*/
public static function readableFileSize($bytes, $decimals = -1)
{
static $sz = array('Byte', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB');
$factor = floor((strlen($bytes) - 1) / 3);
if ($factor == 0) {
$decimals = 0;
} elseif ($decimals === -1) {
$decimals = 2 - floor((strlen($bytes) - 1) % 3);
}
return sprintf("%.{$decimals}f ", $bytes / pow(1024, $factor)) . $sz[$factor];
}
public static function sanitizeFilename($name)
{
return preg_replace('/[^a-zA-Z0-9_\-]+/', '_', $name);
}
public static function safePath($path, $prefix = '')
{
if (empty($path))
return false;
$path = trim($path);
if ($path{0} == '/' || preg_match('/[\x00-\x19\?\*]/', $path))
return false;
if (strpos($path, '..') !== false)
return false;
if (substr($path, 0, 2) !== './')
$path = "./$path";
if (empty($prefix))
return $path;
if (substr($prefix, 0, 2) !== './')
$prefix = "./$prefix";
if (substr($path, 0, strlen($prefix)) !== $prefix)
return false;
return $path;
}
/**
* Create human readable error description from a $_FILES[<..>]['error'] code
*
* @param int $code the code to turn into an error description
* @return string the error description
*/
public static function uploadErrorString($code)
{
switch ($code) {
case UPLOAD_ERR_INI_SIZE:
$message = "The uploaded file exceeds the upload_max_filesize directive in php.ini";
break;
case UPLOAD_ERR_FORM_SIZE:
$message = "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form";
break;
case UPLOAD_ERR_PARTIAL:
$message = "The uploaded file was only partially uploaded";
break;
case UPLOAD_ERR_NO_FILE:
$message = "No file was uploaded";
break;
case UPLOAD_ERR_NO_TMP_DIR:
$message = "Missing a temporary folder";
break;
case UPLOAD_ERR_CANT_WRITE:
$message = "Failed to write file to disk";
break;
case UPLOAD_ERR_EXTENSION:
$message = "File upload stopped by extension";
break;
default:
$message = "Unknown upload error";
break;
}
return $message;
}
/**
* Is given string a public ipv4 address?
*
* @param string $ip_addr input to check
* @return boolean true iff $ip_addr is a valid public ipv4 address
*/
public static function isPublicIpv4($ip_addr)
{
if (!preg_match("/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/", $ip_addr))
return false;
$parts = explode(".", $ip_addr);
foreach ($parts as $part) {
if (!is_numeric($part) || $part > 255 || $part < 0)
return false;
}
if ($parts[0] == 0 || $parts[0] == 10 || $parts[0] == 127 || ($parts[0] > 223 && $parts[0] < 240))
return false;
if (($parts[0] == 192 && $parts[1] == 168) || ($parts[0] == 169 && $parts[1] == 254))
return false;
if ($parts[0] == 172 && $parts[1] > 15 && $parts[1] < 32)
return false;
return true;
}
/**
* Return contents of given file as string, but only read up to maxBytes bytes.
*
* @param string $file file to read
* @param int $maxBytes maximum length to read
* @return boolean success or failure
*/
public static function readFile($file, $maxBytes = 1000)
{
$fh = @fopen($file, 'rb');
if ($fh === false)
return false;
$data = fread($fh, $maxBytes);
fclose($fh);
return $data;
}
}
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