157 lines
3 KiB
PHP
157 lines
3 KiB
PHP
<?php
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/**
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* ZeroBin
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*
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* a zero-knowledge paste bin
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*
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* @link http://sebsauvage.net/wiki/doku.php?id=php:zerobin
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license http://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 0.22
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*/
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/**
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* model_abstract
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*
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* Abstract model for ZeroBin objects.
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*/
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abstract class model_abstract
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{
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/**
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* Instance ID.
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*
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* @access protected
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* @var string
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*/
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protected $_id = '';
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/**
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* Instance data.
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*
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* @access protected
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* @var stdClass
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*/
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protected $_data;
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/**
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* Configuration.
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*
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* @access protected
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* @var configuration
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*/
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protected $_conf;
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/**
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* Data storage.
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*
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* @access protected
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* @var zerobin_abstract
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*/
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protected $_store;
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/**
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* Instance constructor.
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*
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* @access public
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* @param configuration $configuration
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* @param zerobin_abstract $storage
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* @return void
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*/
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public function __construct(configuration $configuration, zerobin_abstract $storage)
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{
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$this->_conf = $configuration;
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$this->_store = $storage;
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$this->_data = new stdClass;
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$this->_data->meta = new stdClass;
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}
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/**
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* Get ID.
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*
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* @access public
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* @return string
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*/
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public function getId()
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{
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return $this->_id;
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}
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/**
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* Set ID.
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*
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* @access public
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* @param string $id
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* @throws Exception
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* @return void
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*/
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public function setId($id)
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{
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if (!self::isValidId($id)) throw new Exception('Invalid paste ID.', 60);
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$this->_id = $id;
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}
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/**
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* Set data and recalculate ID.
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*
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* @access public
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* @param string $data
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* @throws Exception
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* @return void
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*/
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public function setData($data)
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{
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if (!sjcl::isValid($data)) throw new Exception('Invalid data.', 61);
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$this->_data->data = $data;
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// We just want a small hash to avoid collisions:
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// Half-MD5 (64 bits) will do the trick
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$this->setId(substr(hash('md5', $data), 0, 16));
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}
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/**
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* Get instance data.
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*
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* @access public
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* @return stdObject
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*/
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abstract public function get();
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/**
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* Store the instance's data.
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*
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* @access public
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* @throws Exception
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* @return void
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*/
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abstract public function store();
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/**
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* Delete the current instance.
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*
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* @access public
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* @throws Exception
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* @return void
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*/
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abstract public function delete();
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/**
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* Test if current instance exists in store.
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*
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* @access public
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* @return bool
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*/
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abstract public function exists();
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/**
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* Validate ID.
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*
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* @access public
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* @static
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* @param string $id
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* @return bool
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*/
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public static function isValidId($id)
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{
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return (bool) preg_match('#\A[a-f\d]{16}\z#', (string) $id);
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}
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}
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