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<?php |
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/** |
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* |
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* This file is part of phpFastCache. |
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* |
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* @license MIT License (MIT) |
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* |
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* For full copyright and license information, please see the docs/CREDITS.txt file. |
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* |
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* @author Khoa Bui (khoaofgod) <[email protected]> http://www.phpfastcache.com |
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* @author Georges.L (Geolim4) <[email protected]> |
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* |
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*/ |
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namespace phpFastCache\Cache; |
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use phpFastCache\Exceptions\phpFastCacheDriverException; |
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/** |
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* Class DriverBaseTrait |
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* @package phpFastCache\Cache |
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*/ |
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trait DriverBaseTrait |
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{ |
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/** |
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* @var array |
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*/ |
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public $extension_dir = '_extensions'; |
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/** |
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* @var array |
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*/ |
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public $tmp = []; |
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/** |
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* @var array default options, this will be merge to Driver's Options |
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*/ |
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public $config = []; |
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/** |
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* @var bool |
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*/ |
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public $fallback = false; |
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/** |
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* @var mixed Instance of driver service |
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*/ |
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public $instance; |
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/** |
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* @param $keyword |
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* @return string |
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*/ |
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protected function encodeFilename($keyword) |
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{ |
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return md5($keyword); |
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} |
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/** |
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* @param $config_name |
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* @param string $value |
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*/ |
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public function setup($config_name, $value = '') |
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{ |
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/** |
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* Config for class |
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*/ |
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if (is_array($config_name)) { |
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$this->config = array_merge($this->config, $config_name); |
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} else { |
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$this->config[ $config_name ] = $value; |
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} |
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} |
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/** |
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* @param $file |
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* @return string |
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* @throws \Exception |
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*/ |
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protected function readfile($file) |
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{ |
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if (function_exists('file_get_contents')) { |
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return file_get_contents($file); |
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} else { |
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$string = ''; |
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$file_handle = @fopen($file, 'r'); |
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if (!$file_handle) { |
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throw new phpFastCacheDriverException("Can't Read File", 96); |
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} |
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while (!feof($file_handle)) { |
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$line = fgets($file_handle); |
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$string .= $line; |
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} |
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fclose($file_handle); |
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return $string; |
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} |
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} |
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/** |
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* Encode data types such as object/array |
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* for driver that does not support |
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* non-scalar value |
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* @param $data |
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* @return string |
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*/ |
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protected function encode($data) |
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{ |
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return serialize($data); |
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} |
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/** |
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* Decode data types such as object/array |
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* for driver that does not support |
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* non-scalar value |
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* @param $value |
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* @return mixed |
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*/ |
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protected function decode($value) |
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{ |
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$x = @unserialize($value); |
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if ($x == false) { |
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return $value; |
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} else { |
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return $x; |
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} |
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} |
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/** |
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* Check phpModules or CGI |
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* @return bool |
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*/ |
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protected function isPHPModule() |
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{ |
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if (PHP_SAPI === 'apache2handler') { |
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return true; |
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} else { |
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if (strpos(PHP_SAPI, 'handler') !== false) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* @param $class |
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* @return bool |
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*/ |
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protected function isExistingDriver($class) |
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{ |
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return class_exists("\\phpFastCache\\Drivers\\{$class}"); |
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} |
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/** |
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* @param $tag |
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* @return string |
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*/ |
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protected function _getTagName($tag) |
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{ |
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return "__tag__" . $tag; |
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} |
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/** |
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* @param \phpFastCache\Cache\ExtendedCacheItemInterface $item |
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* @return array |
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*/ |
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public function driverPreWrap(ExtendedCacheItemInterface $item) |
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{ |
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return [ |
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self::DRIVER_DATA_WRAPPER_INDEX => $item->get(), |
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self::DRIVER_TIME_WRAPPER_INDEX => $item->getExpirationDate(), |
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self::DRIVER_TAGS_WRAPPER_INDEX => $item->getTags(), |
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]; |
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} |
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/** |
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* @param array $wrapper |
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* @return mixed |
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*/ |
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public function driverUnwrapData(array $wrapper) |
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{ |
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return $wrapper[ self::DRIVER_DATA_WRAPPER_INDEX ]; |
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} |
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/** |
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* @param array $wrapper |
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* @return mixed |
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*/ |
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public function driverUnwrapTags(array $wrapper) |
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{ |
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return $wrapper[ self::DRIVER_TAGS_WRAPPER_INDEX ]; |
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} |
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/** |
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* @param array $wrapper |
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* @return \DateTime |
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*/ |
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public function driverUnwrapTime(array $wrapper) |
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{ |
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return $wrapper[ self::DRIVER_TIME_WRAPPER_INDEX ]; |
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} |
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/** |
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* @return string |
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*/ |
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public function getDriverName() |
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{ |
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static $driverName; |
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return ($driverName ?: $driverName = ucfirst(substr(strrchr((new \ReflectionObject($this))->getNamespaceName(), '\\'), 1))); |
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} |
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/** |
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* @param \phpFastCache\Cache\ExtendedCacheItemInterface $item |
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* @return bool |
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*/ |
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public function driverWriteTags(ExtendedCacheItemInterface $item) |
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{ |
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$tagsItems = $this->getItems($this->getTagKeys($item->getTags())); |
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foreach ($tagsItems as $tagsItem) { |
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$data = $tagsItem->get(); |
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$expTimestamp = $item->getExpirationDate()->getTimestamp(); |
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/** |
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* Using the key will |
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* avoid to use array_unique |
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* that has slow performances |
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*/ |
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$tagsItem->set(array_merge((array) $data, [$item->getKey() => $expTimestamp])); |
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/** |
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* Set the expiration date |
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* of the $tagsItem based |
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* on the older $item |
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* expiration date |
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*/ |
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if ($expTimestamp > $tagsItem->getExpirationDate()->getTimestamp()) { |
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$tagsItem->expiresAt($item->getExpirationDate()); |
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} |
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$this->driverWrite($tagsItem); |
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} |
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/** |
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* Also update removed tags to |
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* keep the index up to date |
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*/ |
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$tagsItems = $this->getItems($this->getTagKeys($item->getRemovedTags())); |
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foreach ($tagsItems as $tagsItem) { |
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$data = (array) $tagsItem->get(); |
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unset($data[ $item->getKey() ]); |
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$tagsItem->set($data); |
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/** |
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* Recalculate the expiration date |
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* |
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* If the $tagsItem does not have |
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* any cache item references left |
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* then remove it from tagsItems index |
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*/ |
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if (count($data)) { |
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$tagsItem->expiresAt(max($data)); |
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$this->driverWrite($tagsItem); |
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} else { |
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$this->driverDelete($tagsItem); |
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} |
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} |
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return true; |
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} |
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/** |
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* @param $key |
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* @return string |
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*/ |
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public function getTagKey($key) |
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{ |
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return self::DRIVER_TAGS_KEY_PREFIX . $key; |
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} |
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/** |
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* @param $key |
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* @return string |
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*/ |
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public function getTagKeys(array $keys) |
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{ |
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foreach ($keys as &$key) { |
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$key = $this->getTagKey($key); |
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} |
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return $keys; |
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} |
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} |
$file
can contain request data and is used in file inclusion context(s) leading to a potential security vulnerability.General Strategies to prevent injection
In general, it is advisable to prevent any user-data to reach this point. This can be done by white-listing certain values:
For numeric data, we recommend to explicitly cast the data: