PrivateBin/lib/model/abstract.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
*/
/**
* model_abstract
*
* Abstract model for ZeroBin objects.
*/
abstract class model_abstract
{
/**
* Instance ID.
*
* @access protected
* @var string
*/
protected $_id = '';
/**
* Instance data.
*
* @access protected
* @var stdClass
*/
protected $_data;
/**
* Configuration.
*
* @access protected
* @var configuration
*/
protected $_conf;
/**
* Data storage.
*
* @access protected
* @var zerobin_abstract
*/
protected $_store;
/**
* Instance constructor.
*
* @access public
* @param configuration $configuration
* @param zerobin_abstract $storage
* @return void
*/
public function __construct(configuration $configuration, zerobin_abstract $storage)
{
$this->_conf = $configuration;
$this->_store = $storage;
$this->_data = new stdClass;
$this->_data->meta = new stdClass;
}
/**
* Get ID.
*
* @access public
* @return string
*/
public function getId()
{
return $this->_id;
}
/**
* Set ID.
*
* @access public
* @param string $id
* @throws Exception
* @return void
*/
public function setId($id)
{
if (!self::isValidId($id)) throw new Exception('Invalid paste ID.', 60);
$this->_id = $id;
}
/**
* Set data and recalculate ID.
*
* @access public
* @param string $data
* @throws Exception
* @return void
*/
public function setData($data)
{
if (!sjcl::isValid($data)) throw new Exception('Invalid data.', 61);
$this->_data->data = $data;
// We just want a small hash to avoid collisions:
// Half-MD5 (64 bits) will do the trick
$this->setId(substr(hash('md5', $data), 0, 16));
}
/**
* Get instance data.
*
* @access public
* @return stdObject
*/
abstract public function get();
/**
* Store the instance's data.
*
* @access public
* @throws Exception
* @return void
*/
abstract public function store();
/**
* Delete the current instance.
*
* @access public
* @throws Exception
* @return void
*/
abstract public function delete();
/**
* Test if current instance exists in store.
*
* @access public
* @return bool
*/
abstract public function exists();
/**
* Validate ID.
*
* @access public
* @static
* @param string $id
* @return bool
*/
public static function isValidId($id)
{
return (bool) preg_match('#\A[a-f\d]{16}\z#', (string) $id);
}
}