PrivateBin/lib/Data/AbstractData.php

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<?php
/**
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* PrivateBin
*
* a zero-knowledge paste bin
*
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* @link https://github.com/PrivateBin/PrivateBin
* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
* @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 1.3.5
*/
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namespace PrivateBin\Data;
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/**
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* AbstractData
*
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* Abstract model for PrivateBin data access, implemented as a singleton.
*/
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abstract class AbstractData
{
/**
* Singleton instance
*
* @access protected
* @static
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* @var AbstractData
*/
protected static $_instance = null;
/**
* cache for the traffic limiter
*
* @access private
* @static
* @var array
*/
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protected static $_last_cache = array();
/**
* Enforce singleton, disable constructor
*
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* Instantiate using {@link getInstance()}, privatebin is a singleton object.
*
* @access protected
*/
protected function __construct()
{
}
/**
* Enforce singleton, disable cloning
*
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* Instantiate using {@link getInstance()}, privatebin is a singleton object.
*
* @access private
*/
private function __clone()
{
}
/**
* Get instance of singleton
*
* @access public
* @static
* @param array $options
* @return AbstractData
*/
public static function getInstance(array $options)
{
}
/**
* Create a paste.
*
* @access public
* @param string $pasteid
* @param array $paste
* @return bool
*/
abstract public function create($pasteid, array $paste);
/**
* Read a paste.
*
* @access public
* @param string $pasteid
* @return array|false
*/
abstract public function read($pasteid);
/**
* Delete a paste and its discussion.
*
* @access public
* @param string $pasteid
*/
abstract public function delete($pasteid);
/**
* Test if a paste exists.
*
* @access public
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* @param string $pasteid
* @return bool
*/
abstract public function exists($pasteid);
/**
* Create a comment in a paste.
*
* @access public
* @param string $pasteid
* @param string $parentid
* @param string $commentid
* @param array $comment
* @return bool
*/
abstract public function createComment($pasteid, $parentid, $commentid, array $comment);
/**
* Read all comments of paste.
*
* @access public
* @param string $pasteid
* @return array
*/
abstract public function readComments($pasteid);
/**
* Test if a comment exists.
*
* @access public
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* @param string $pasteid
* @param string $parentid
* @param string $commentid
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* @return bool
*/
abstract public function existsComment($pasteid, $parentid, $commentid);
/**
* Purge outdated entries.
*
* @access public
* @param string $namespace
* @param int $time
* @return void
*/
public function purgeValues($namespace, $time)
{
if ($namespace === 'traffic_limiter') {
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foreach (self::$_last_cache as $key => $last_submission) {
if ($last_submission <= $time) {
unset(self::$_last_cache[$key]);
}
}
}
}
/**
* Save a value.
*
* @access public
* @param string $value
* @param string $namespace
* @param string $key
* @return bool
*/
abstract public function setValue($value, $namespace, $key = '');
/**
* Load a value.
*
* @access public
* @param string $namespace
* @param string $key
* @return string
*/
abstract public function getValue($namespace, $key = '');
/**
* Returns up to batch size number of paste ids that have expired
*
* @access protected
* @param int $batchsize
* @return array
*/
abstract protected function _getExpiredPastes($batchsize);
/**
* Perform a purge of old pastes, at most the given batchsize is deleted.
*
* @access public
* @param int $batchsize
*/
public function purge($batchsize)
{
if ($batchsize < 1) {
return;
}
$pastes = $this->_getExpiredPastes($batchsize);
if (count($pastes)) {
foreach ($pastes as $pasteid) {
$this->delete($pasteid);
}
}
}
/**
* Get next free slot for comment from postdate.
*
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* @access protected
* @param array $comments
* @param int|string $postdate
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* @return int|string
*/
protected function getOpenSlot(array &$comments, $postdate)
{
if (array_key_exists($postdate, $comments)) {
$parts = explode('.', $postdate, 2);
if (!array_key_exists(1, $parts)) {
$parts[1] = 0;
}
++$parts[1];
return $this->getOpenSlot($comments, implode('.', $parts));
}
return $postdate;
}
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/**
* Upgrade pre-version 1 pastes with attachment to version 1 format.
*
* @access protected
* @static
* @param array $paste
* @return array
*/
protected static function upgradePreV1Format(array $paste)
{
if (array_key_exists('attachment', $paste['meta'])) {
$paste['attachment'] = $paste['meta']['attachment'];
unset($paste['meta']['attachment']);
if (array_key_exists('attachmentname', $paste['meta'])) {
$paste['attachmentname'] = $paste['meta']['attachmentname'];
unset($paste['meta']['attachmentname']);
}
}
return $paste;
}
}