<?php
class Util
{
private static $redirectParams = array();
/**
* Displays an error message and stops script execution.
* If CONFIG_DEBUG is true, it will also dump a stack trace
* and all globally defined variables.
* (As this might reveal sensistive data you should never enable it in production)
*/
public static function traceError($message)
{
if ((defined('API') && API) || (defined('AJAX') && AJAX)) {
error_log('API ERROR: ' . $message);
error_log(self::formatBacktracePlain(debug_backtrace()));
}
if (php_sapi_name() === 'cli') {
// Don't spam HTML when invoked via cli, above error_log should have gone to stdout/stderr
exit(1);
}
Header('HTTP/1.1 500 Internal Server Error');
Header('Content-Type: text/html; charset=utf-8');
echo '<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><style>', "\n",
".arg { color: red; background: white; }\n",
"h1 a { color: inherit; text-decoration: inherit; font-weight: inherit; }\n",
'</style><title>Fatal Error</title></head><body>';
echo '<h1>Flagrant <a href="https://www.youtube.com/watch?v=7rrZ-sA4FQc&t=2m2s" target="_blank">S</a>ystem error</h1>';
echo "<h2>Message</h2><pre>$message</pre>";
if (strpos($message, 'Database') !== false) {
echo '<div><a href="install.php">Try running database setup</a></div>';
}
echo "<br><br>";
if (defined('CONFIG_DEBUG') && CONFIG_DEBUG) {
global $SLX_ERRORS;
if (!empty($SLX_ERRORS)) {
echo '<h2>PHP Errors</h2><pre>';
foreach ($SLX_ERRORS as $error) {
echo htmlspecialchars("{$error['errstr']} ({$error['errfile']}:{$error['errline']}\n");
}
echo '</pre>';
}
echo "<h2>Stack Trace</h2>";
echo '<pre>', self::formatBacktraceHtml(debug_backtrace()), '</pre>';
echo "<h2>Globals</h2><pre>";
echo htmlspecialchars(print_r($GLOBALS, true));
echo '</pre>';
} else {
echo <<<SADFACE
<pre>
________________________¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶________
____________________¶¶¶___________________¶¶¶¶_____
________________¶¶¶_________________________¶¶¶¶___
______________¶¶______________________________¶¶¶__
___________¶¶¶_________________________________¶¶¶_
_________¶¶_____________________________________¶¶¶
________¶¶_________¶¶¶¶¶___________¶¶¶¶¶_________¶¶
______¶¶__________¶¶¶¶¶¶__________¶¶¶¶¶¶_________¶¶
_____¶¶___________¶¶¶¶____________¶¶¶¶___________¶¶
____¶¶___________________________________________¶¶
___¶¶___________________________________________¶¶_
__¶¶____________________¶¶¶¶____________________¶¶_
_¶¶_______________¶¶¶¶¶¶¶¶¶¶¶¶¶¶¶______________¶¶__
_¶¶____________¶¶¶¶___________¶¶¶¶¶___________¶¶___
¶¶¶_________¶¶¶__________________¶¶__________¶¶____
¶¶_________¶______________________¶¶________¶¶_____
¶¶¶______¶________________________¶¶_______¶¶______
¶¶¶_____¶_________________________¶¶_____¶¶________
_¶¶¶___________________________________¶¶__________
__¶¶¶________________________________¶¶____________
___¶¶¶____________________________¶¶_______________
____¶¶¶¶______________________¶¶¶__________________
_______¶¶¶¶¶_____________¶¶¶¶¶_____________________
</pre>
SADFACE;
}
echo '</body></html>';
exit(0);
}
public static function formatBacktraceHtml($trace, $escape = true)
{
$output = '';
foreach ($trace as $idx => $line) {
$args = array();
foreach ($line['args'] as $arg) {
if (is_string($arg)) {
$arg = "'$arg'";
} elseif (is_object($arg)) {
$arg = 'instanceof ' . get_class($arg);
} elseif (is_array($arg)) {
$arg = 'Array(' . count($arg) . ')';
}
$args[] = '<span class="arg">' . htmlspecialchars($arg) . '</span>';
}
$frame = str_pad('#' . $idx, 3, ' ', STR_PAD_LEFT);
$function = htmlspecialchars($line['function']);
$args = implode(', ', $args);
$file = preg_replace('~(/[^/]+)$~', '<b>$1</b>', htmlspecialchars($line['file']));
// Add line
$output .= $frame . ' ' . $function . '<b>(</b>'
. $args . '<b>)</b>' . ' @ <i>' . $file . '</i>:' . $line['line'] . "\n";
}
return $output;
}
public static function formatBacktracePlain($trace)
{
$output = '';
foreach ($trace as $idx => $line) {
$args = array();
foreach ($line['args'] as $arg) {
if (is_string($arg)) {
$arg = "'$arg'";
} elseif (is_object($arg)) {
$arg = 'instanceof ' . get_class($arg);
} elseif (is_array($arg)) {
$arg = 'Array(' . count($arg) . ')';
}
$args[] = $arg;
}
$frame = str_pad('#' . $idx, 3, ' ', STR_PAD_LEFT);
$args = implode(', ', $args);
// Add line
$output .= "\n" . $frame . ' ' . $line['function'] . '('
. $args . ')' . ' @ ' . $line['file'] . ':' . $line['line'];
}
return $output;
}
/**
* 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 .= '&' . $messages;
}
}
if (!empty(self::$redirectParams)) {
if (strpos($location, '?') === false) {
$location .= '?' . implode('&', self::$redirectParams);
} else {
$location .= '&' . implode('&', self::$redirectParams);
}
}
Header('Location: ' . $location);
exit(0);
}
public static function addRedirectParam($key, $value)
{
self::$redirectParams[] = $key .= '=' . urlencode($value);
}
/**
* Verify the user's token that protects against 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 (!User::isLoggedIn() && Session::get('token') === false)
return true;
if (isset($_REQUEST['token']) && Session::get('token') === $_REQUEST['token'])
return true;
Message::addError('main.token');
return false;
}
/**
* Simple markup "rendering":
* *word* is bold
* /word/ is italics
* _word_ is underlined
* \n is line break
*/
public static function markup($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;
}
/**
* Check whether $arrax contains all keys given in $keyList
* @param array $array An array
* @param array $keyList A list of strings which must all be valid keys in $array
* @return boolean
*/
public static function hasAllKeys($array, $keyList)
{
if (!is_array($array))
return false;
foreach ($keyList as $key) {
if (!isset($array[$key]))
return false;
}
return true;
}
/**
* Send a file to user for download.
*
* @param type $file path of local file
* @param type $name name of file to send to user agent
* @param type $delete delete the file when done?
* @return boolean false: file could not be opened.
* true: error while reading the file
* - on success, the function does not return
*/
public static function sendFile($file, $name, $delete = false)
{
while ((@ob_get_level()) > 0)
@ob_end_clean();
$fh = @fopen($file, 'rb');
if ($fh === false) {
Message::addError('main.error-read', $file);
return false;
}
Header('Content-Type: application/octet-stream', true);
Header('Content-Disposition: attachment; filename=' . str_replace(array(' ', '=', ',', '/', '\\', ':', '?'), '_', iconv('UTF-8', 'ASCII//TRANSLIT', $name)));
Header('Content-Length: ' . @filesize($file));
while (!feof($fh)) {
$data = fread($fh, 16000);
if ($data === false) {
echo "\r\n\nDOWNLOAD INTERRUPTED!\n";
if ($delete)
@unlink($file);
return true;
}
echo $data;
@ob_flush();
@flush();
}
@fclose($fh);
if ($delete)
@unlink($file);
exit(0);
}
}
