PrivateBin/lib/persistence.php

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<?php
/**
* ZeroBin
*
* a zero-knowledge paste bin
*
* @link http://sebsauvage.net/wiki/doku.php?id=php:zerobin
* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
* @license http://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
* @version 0.22
*/
/**
* persistence
*
* persists data in PHP files
*/
abstract class persistence
{
/**
* path in which to persist something
*
* @access private
* @static
* @var string
*/
private static $_path = 'data';
/**
* set the path
*
* @access public
* @static
* @param string $path
* @return void
*/
public static function setPath($path)
{
self::$_path = $path;
}
/**
* get the path
*
* @access public
* @static
* @param string $filename
* @return void
*/
public static function getPath($filename = null)
{
if(strlen($filename)) {
return self::$_path . DIRECTORY_SEPARATOR . $filename;
} else {
return self::$_path;
}
}
/**
* checks if the file exists
*
* @access protected
* @static
* @param string $filename
* @return bool
*/
protected static function _exists($filename)
{
self::_initialize();
return is_file(self::$_path . DIRECTORY_SEPARATOR . $filename);
}
/**
* prepares path for storage
*
* @access protected
* @static
* @throws Exception
* @return void
*/
protected static function _initialize()
{
// Create storage directory if it does not exist.
if (!is_dir(self::$_path))
if (!@mkdir(self::$_path))
throw new Exception('unable to create directory ' . self::$_path, 10);
// Create .htaccess file if it does not exist.
$file = self::$_path . DIRECTORY_SEPARATOR . '.htaccess';
if (!is_file($file))
{
$writtenBytes = @file_put_contents(
$file,
'Allow from none' . PHP_EOL .
'Deny from all'. PHP_EOL,
LOCK_EX
);
if ($writtenBytes === false || $writtenBytes < 30) {
throw new Exception('unable to write to file ' . $file, 11);
}
}
}
/**
* store the data
*
* @access protected
* @static
* @param string $filename
* @param string $data
* @throws Exception
* @return string
*/
protected static function _store($filename, $data)
{
self::_initialize();
$file = self::$_path . DIRECTORY_SEPARATOR . $filename;
$writtenBytes = @file_put_contents($file, $data, LOCK_EX);
chmod($file, 0640); // protect file access
if ($writtenBytes === false || $writtenBytes < strlen($data)) {
throw new Exception('unable to write to file ' . $file, 13);
}
return $file;
}
}