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<?php
// SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue
// SPDX-License-Identifier: BSD-3-Clause
declare(strict_types=1);
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_`
*
* @deprecated since SimplePie 1.8.0, use implementation of "Psr\SimpleCache\CacheInterface" instead
*/
class MySQL extends DB
{
/**
* PDO instance
*
* @var \PDO|null
*/
protected $mysql;
/**
* Options
*
* @var array<string, mixed>
*/
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(string $location, string $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<string>|\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<string>|false 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((string) $row);
}
} else {
return false;
}
}
}
return $data;
}
return false;
}
/**
* Retrieve the last modified time for the cache
*
* @return int|false Timestamp
*/
public function mtime()
{
if ($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 (int) $time;
}
return false;
}
/**
* Set the last modified time to the current time
*
* @return bool Success status
*/
public function touch()
{
if ($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');