Proyectos de Subversion Moodle

<?php

/**

 * SimplePie

 *

 * A PHP-Based RSS and Atom Feed Framework.

 * Takes the hard work out of managing a complete RSS/Atom solution.

 *

 * Copyright (c) 2004-2022, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without modification, are

 * permitted provided that the following conditions are met:

 *

 * 	* Redistributions of source code must retain the above copyright notice, this list of

 * 	  conditions and the following disclaimer.

 *

 * 	* Redistributions in binary form must reproduce the above copyright notice, this list

 * 	  of conditions and the following disclaimer in the documentation and/or other materials

 * 	  provided with the distribution.

 *

 * 	* Neither the name of the SimplePie Team nor the names of its contributors may be used

 * 	  to endorse or promote products derived from this software without specific prior

 * 	  written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY

 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS

 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * @package SimplePie

 * @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue

 * @author Ryan Parman

 * @author Sam Sneddon

 * @author Ryan McCue

 * @link http://simplepie.org/ SimplePie

 * @license http://www.opensource.org/licenses/bsd-license.php BSD License

 */

namespace SimplePie\Cache;

/**

 * Caches data to a MySQL database

 *

 * Registered for URLs with the "mysql" protocol

 *

 * For example, `mysql://root:password@localhost:3306/mydb?prefix=sp_` will

 * connect to the `mydb` database on `localhost` on port 3306, with the user

 * `root` and the password `password`. All tables will be prefixed with `sp_`

 *

 * @package SimplePie

 * @subpackage Caching

 * @deprecated since SimplePie 1.8.0, use implementation of "Psr\SimpleCache\CacheInterface" instead

 */

class MySQL extends DB

{

    /**

     * PDO instance

     *

     * @var \PDO

     */

    protected $mysql;

    /**

     * Options

     *

     * @var array

     */

    protected $options;

    /**

     * Cache ID

     *

     * @var string

     */

    protected $id;

    /**

     * Create a new cache object

     *

     * @param string $location Location string (from SimplePie::$cache_location)

     * @param string $name Unique ID for the cache

     * @param Base::TYPE_FEED|Base::TYPE_IMAGE $type Either TYPE_FEED for SimplePie data, or TYPE_IMAGE for image data

     */

    public function __construct($location, $name, $type)

    {

        $this->options = [

            'user' => null,

            'pass' => null,

            'host' => '127.0.0.1',

            'port' => '3306',

            'path' => '',

            'extras' => [

                'prefix' => '',

                'cache_purge_time' => 2592000

            ],

        ];

        $this->options = array_replace_recursive($this->options, \SimplePie\Cache::parse_URL($location));

        // Path is prefixed with a "/"

        $this->options['dbname'] = substr($this->options['path'], 1);

        try {

            $this->mysql = new \PDO("mysql:dbname={$this->options['dbname']};host={$this->options['host']};port={$this->options['port']}", $this->options['user'], $this->options['pass'], [\PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8']);

        } catch (\PDOException $e) {

            $this->mysql = null;

            return;

        }

        $this->id = $name . $type;

        if (!$query = $this->mysql->query('SHOW TABLES')) {

            $this->mysql = null;

            return;

        }

        $db = [];

        while ($row = $query->fetchColumn()) {

            $db[] = $row;

        }

        if (!in_array($this->options['extras']['prefix'] . 'cache_data', $db)) {

            $query = $this->mysql->exec('CREATE TABLE `' . $this->options['extras']['prefix'] . 'cache_data` (`id` TEXT CHARACTER SET utf8 NOT NULL, `items` SMALLINT NOT NULL DEFAULT 0, `data` BLOB NOT NULL, `mtime` INT UNSIGNED NOT NULL, UNIQUE (`id`(125)))');

            if ($query === false) {

                trigger_error("Can't create " . $this->options['extras']['prefix'] . "cache_data table, check permissions", \E_USER_WARNING);

                $this->mysql = null;

                return;

            }

        }

        if (!in_array($this->options['extras']['prefix'] . 'items', $db)) {

            $query = $this->mysql->exec('CREATE TABLE `' . $this->options['extras']['prefix'] . 'items` (`feed_id` TEXT CHARACTER SET utf8 NOT NULL, `id` TEXT CHARACTER SET utf8 NOT NULL, `data` MEDIUMBLOB NOT NULL, `posted` INT UNSIGNED NOT NULL, INDEX `feed_id` (`feed_id`(125)))');

            if ($query === false) {

                trigger_error("Can't create " . $this->options['extras']['prefix'] . "items table, check permissions", \E_USER_WARNING);

                $this->mysql = null;

                return;

            }

        }

    }

    /**

     * Save data to the cache

     *

     * @param array|\SimplePie\SimplePie $data Data to store in the cache. If passed a SimplePie object, only cache the $data property

     * @return bool Successfulness

     */

    public function save($data)

    {

        if ($this->mysql === null) {

            return false;

        }

        $query = $this->mysql->prepare('DELETE i, cd FROM `' . $this->options['extras']['prefix'] . 'cache_data` cd, ' .

            '`' . $this->options['extras']['prefix'] . 'items` i ' .

            'WHERE cd.id = i.feed_id ' .

            'AND cd.mtime < (unix_timestamp() - :purge_time)');

        $query->bindValue(':purge_time', $this->options['extras']['cache_purge_time']);

        if (!$query->execute()) {

            return false;

        }

        if ($data instanceof \SimplePie\SimplePie) {

            $data = clone $data;

            $prepared = self::prepare_simplepie_object_for_cache($data);

            $query = $this->mysql->prepare('SELECT COUNT(*) FROM `' . $this->options['extras']['prefix'] . 'cache_data` WHERE `id` = :feed');

            $query->bindValue(':feed', $this->id);

            if ($query->execute()) {

                if ($query->fetchColumn() > 0) {

                    $items = count($prepared[1]);

                    if ($items) {

                        $sql = 'UPDATE `' . $this->options['extras']['prefix'] . 'cache_data` SET `items` = :items, `data` = :data, `mtime` = :time WHERE `id` = :feed';

                        $query = $this->mysql->prepare($sql);

                        $query->bindValue(':items', $items);

                    } else {

                        $sql = 'UPDATE `' . $this->options['extras']['prefix'] . 'cache_data` SET `data` = :data, `mtime` = :time WHERE `id` = :feed';

                        $query = $this->mysql->prepare($sql);

                    }

                    $query->bindValue(':data', $prepared[0]);

                    $query->bindValue(':time', time());

                    $query->bindValue(':feed', $this->id);

                    if (!$query->execute()) {

                        return false;

                    }

                } else {

                    $query = $this->mysql->prepare('INSERT INTO `' . $this->options['extras']['prefix'] . 'cache_data` (`id`, `items`, `data`, `mtime`) VALUES(:feed, :count, :data, :time)');

                    $query->bindValue(':feed', $this->id);

                    $query->bindValue(':count', count($prepared[1]));

                    $query->bindValue(':data', $prepared[0]);

                    $query->bindValue(':time', time());

                    if (!$query->execute()) {

                        return false;

                    }

                }

                $ids = array_keys($prepared[1]);

                if (!empty($ids)) {

                    foreach ($ids as $id) {

                        $database_ids[] = $this->mysql->quote($id);

                    }

                    $query = $this->mysql->prepare('SELECT `id` FROM `' . $this->options['extras']['prefix'] . 'items` WHERE `id` = ' . implode(' OR `id` = ', $database_ids) . ' AND `feed_id` = :feed');

                    $query->bindValue(':feed', $this->id);

                    if ($query->execute()) {

                        $existing_ids = [];

                        while ($row = $query->fetchColumn()) {

                            $existing_ids[] = $row;

                        }

                        $new_ids = array_diff($ids, $existing_ids);

                        foreach ($new_ids as $new_id) {

                            if (!($date = $prepared[1][$new_id]->get_date('U'))) {

                                $date = time();

                            }

                            $query = $this->mysql->prepare('INSERT INTO `' . $this->options['extras']['prefix'] . 'items` (`feed_id`, `id`, `data`, `posted`) VALUES(:feed, :id, :data, :date)');

                            $query->bindValue(':feed', $this->id);

                            $query->bindValue(':id', $new_id);

                            $query->bindValue(':data', serialize($prepared[1][$new_id]->data));

                            $query->bindValue(':date', $date);

                            if (!$query->execute()) {

                                return false;

                            }

                        }

                        return true;

                    }

                } else {

                    return true;

                }

            }

        } else {

            $query = $this->mysql->prepare('SELECT `id` FROM `' . $this->options['extras']['prefix'] . 'cache_data` WHERE `id` = :feed');

            $query->bindValue(':feed', $this->id);

            if ($query->execute()) {

                if ($query->rowCount() > 0) {

                    $query = $this->mysql->prepare('UPDATE `' . $this->options['extras']['prefix'] . 'cache_data` SET `items` = 0, `data` = :data, `mtime` = :time WHERE `id` = :feed');

                    $query->bindValue(':data', serialize($data));

                    $query->bindValue(':time', time());

                    $query->bindValue(':feed', $this->id);

                    if ($query->execute()) {

                        return true;

                    }

                } else {

                    $query = $this->mysql->prepare('INSERT INTO `' . $this->options['extras']['prefix'] . 'cache_data` (`id`, `items`, `data`, `mtime`) VALUES(:id, 0, :data, :time)');

                    $query->bindValue(':id', $this->id);

                    $query->bindValue(':data', serialize($data));

                    $query->bindValue(':time', time());

                    if ($query->execute()) {

                        return true;

                    }

                }

            }

        }

        return false;

    }

    /**

     * Retrieve the data saved to the cache

     *

     * @return array Data for SimplePie::$data

     */

    public function load()

    {

        if ($this->mysql === null) {

            return false;

        }

        $query = $this->mysql->prepare('SELECT `items`, `data` FROM `' . $this->options['extras']['prefix'] . 'cache_data` WHERE `id` = :id');

        $query->bindValue(':id', $this->id);

        if ($query->execute() && ($row = $query->fetch())) {

            $data = unserialize($row[1]);

            if (isset($this->options['items'][0])) {

                $items = (int) $this->options['items'][0];

            } else {

                $items = (int) $row[0];

            }

            if ($items !== 0) {

                if (isset($data['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['feed'][0])) {

                    $feed = &$data['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['feed'][0];

                } elseif (isset($data['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['feed'][0])) {

                    $feed = &$data['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['feed'][0];

                } elseif (isset($data['child'][\SimplePie\SimplePie::NAMESPACE_RDF]['RDF'][0])) {

                    $feed = &$data['child'][\SimplePie\SimplePie::NAMESPACE_RDF]['RDF'][0];

                } elseif (isset($data['child'][\SimplePie\SimplePie::NAMESPACE_RSS_20]['rss'][0])) {

                    $feed = &$data['child'][\SimplePie\SimplePie::NAMESPACE_RSS_20]['rss'][0];

                } else {

                    $feed = null;

                }

                if ($feed !== null) {

                    $sql = 'SELECT `data` FROM `' . $this->options['extras']['prefix'] . 'items` WHERE `feed_id` = :feed ORDER BY `posted` DESC';

                    if ($items > 0) {

                        $sql .= ' LIMIT ' . $items;

                    }

                    $query = $this->mysql->prepare($sql);

                    $query->bindValue(':feed', $this->id);

                    if ($query->execute()) {

                        while ($row = $query->fetchColumn()) {

                            $feed['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['entry'][] = unserialize($row);

                        }

                    } else {

                        return false;

                    }

                }

            }

            return $data;

        }

        return false;

    }

    /**

     * Retrieve the last modified time for the cache

     *

     * @return int Timestamp

     */

    public function mtime()

    {

        if ($this->mysql === null) {

            return false;

        }

        $query = $this->mysql->prepare('SELECT `mtime` FROM `' . $this->options['extras']['prefix'] . 'cache_data` WHERE `id` = :id');

        $query->bindValue(':id', $this->id);

        if ($query->execute() && ($time = $query->fetchColumn())) {

            return $time;

        }

        return false;

    }

    /**

     * Set the last modified time to the current time

     *

     * @return bool Success status

     */

    public function touch()

    {

        if ($this->mysql === null) {

            return false;

        }

        $query = $this->mysql->prepare('UPDATE `' . $this->options['extras']['prefix'] . 'cache_data` SET `mtime` = :time WHERE `id` = :id');

        $query->bindValue(':time', time());

        $query->bindValue(':id', $this->id);

        return $query->execute() && $query->rowCount() > 0;

    }

    /**

     * Remove the cache

     *

     * @return bool Success status

     */

    public function unlink()

    {

        if ($this->mysql === null) {

            return false;

        }

        $query = $this->mysql->prepare('DELETE FROM `' . $this->options['extras']['prefix'] . 'cache_data` WHERE `id` = :id');

        $query->bindValue(':id', $this->id);

        $query2 = $this->mysql->prepare('DELETE FROM `' . $this->options['extras']['prefix'] . 'items` WHERE `feed_id` = :id');

        $query2->bindValue(':id', $this->id);

        return $query->execute() && $query2->execute();

    }

}

class_alias('SimplePie\Cache\MySQL', 'SimplePie_Cache_MySQL');