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View File Name : SmartyCacheResourceMysql.php

<?php
/**
 * Copyright since 2007 PrestaShop SA and Contributors
 * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.md.
 * It is also available through the world-wide-web at this URL:
 * https://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@prestashop.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
 * versions in the future. If you wish to customize PrestaShop for your
 * needs please refer to https://devdocs.prestashop.com/ for more information.
 *
 * @author    PrestaShop SA and Contributors <contact@prestashop.com>
 * @copyright Since 2007 PrestaShop SA and Contributors
 * @license   https://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 */
class Smarty_CacheResource_Mysql extends Smarty_CacheResource_Custom
{
    /** @var PhpEncryption */
    private $phpEncryption;

    public function __construct()
    {
        $this->phpEncryption = new PhpEncryption(_NEW_COOKIE_KEY_);
    }

    /**
     * fetch cached content and its modification time from data source.
     *
     * @param string $id unique cache content identifier
     * @param string $name template name
     * @param string $cache_id cache id
     * @param string $compile_id compile id
     * @param string $content cached content
     * @param int $mtime cache modification timestamp (epoch)
     */
    protected function fetch($id, $name, $cache_id, $compile_id, &$content, &$mtime)
    {
        $row = Db::getInstance()->getRow('SELECT modified, content FROM ' . _DB_PREFIX_ . 'smarty_cache WHERE id_smarty_cache = "' . pSQL($id, true) . '"');
        if ($row) {
            $content = $this->phpEncryption->decrypt($row['content']);
            $mtime = strtotime($row['modified']);
        } else {
            $content = null;
            $mtime = null;
        }
    }

    /**
     * Fetch cached content's modification timestamp from data source.
     *
     * @note implementing this method is optional. Only implement it if modification times can be accessed faster than loading the complete cached content.
     *
     * @param string $id unique cache content identifier
     * @param string $name template name
     * @param string $cache_id cache id
     * @param string $compile_id compile id
     *
     * @return int|bool timestamp (epoch) the template was modified, or false if not found
     */
    protected function fetchTimestamp($id, $name, $cache_id, $compile_id)
    {
        $value = Db::getInstance()->getValue('SELECT modified FROM ' . _DB_PREFIX_ . 'smarty_cache WHERE id_smarty_cache = "' . pSQL($id, true) . '"');
        $mtime = strtotime($value);

        return $mtime;
    }

    /**
     * Save content to cache.
     *
     * @param string $id unique cache content identifier
     * @param string $name template name
     * @param string $cache_id cache id
     * @param string $compile_id compile id
     * @param int|null $exp_time seconds till expiration time in seconds or null
     * @param string $content content to cache
     *
     * @return bool success
     */
    protected function save($id, $name, $cache_id, $compile_id, $exp_time, $content)
    {
        Db::getInstance()->execute('
		REPLACE INTO ' . _DB_PREFIX_ . 'smarty_cache (id_smarty_cache, name, cache_id, content)
		VALUES (
			"' . pSQL($id, true) . '",
			"' . pSQL(sha1($name)) . '",
			"' . pSQL($cache_id, true) . '",
			"' . $this->phpEncryption->encrypt($content) . '"
		)');

        return (bool) Db::getInstance()->Affected_Rows();
    }

    /**
     * Delete content from cache.
     *
     * @param string $name template name
     * @param string $cache_id cache id
     * @param string $compile_id compile id
     * @param int|null $exp_time seconds till expiration or null
     *
     * @return int number of deleted caches
     */
    protected function delete($name, $cache_id, $compile_id, $exp_time)
    {
        // delete the whole cache
        if ($name === null && $cache_id === null && $compile_id === null && $exp_time === null) {
            // returning the number of deleted caches would require a second query to count them
            Db::getInstance()->execute('TRUNCATE TABLE ' . _DB_PREFIX_ . 'smarty_cache');

            return -1;
        }

        $where = [];
        if ($name !== null) {
            $where[] = 'name = "' . pSQL(sha1($name)) . '"';
        }
        if ($exp_time !== null) {
            $where[] = 'modified < DATE_SUB(NOW(), INTERVAL ' . (int) $exp_time . ' SECOND)';
        }
        if ($cache_id !== null) {
            $where[] = '(cache_id  = "' . pSQL($cache_id, true) . '" OR cache_id LIKE "' . pSQL($cache_id . '|%', true) . '")';
        }

        Db::getInstance()->execute('DELETE FROM ' . _DB_PREFIX_ . 'smarty_cache WHERE ' . implode(' AND ', $where));

        return Db::getInstance()->Affected_Rows();
    }
}