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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Joas Schilling <coding@schilljs.com>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @author Robin McCorkell <robin@mccorkell.me.uk>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Vincent Petry <pvince81@owncloud.com>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OC\Files\Cache;
/**
* Handle the mapping between the string and numeric storage ids
*
* Each storage has 2 different ids
* a string id which is generated by the storage backend and reflects the configuration of the storage (e.g. 'smb://user@host/share')
* and a numeric storage id which is referenced in the file cache
*
* A mapping between the two storage ids is stored in the database and accessible trough this class
*
* @package OC\Files\Cache
*/
class Storage {
/** @var StorageGlobal|null */
private static $globalCache = null;
private $storageId;
private $numericId;
/**
* @return StorageGlobal
*/
public static function getGlobalCache() {
if (is_null(self::$globalCache)) {
self::$globalCache = new StorageGlobal(\OC::$server->getDatabaseConnection());
}
return self::$globalCache;
}
/**
* @param \OC\Files\Storage\Storage|string $storage
* @param bool $isAvailable
* @throws \RuntimeException
*/
public function __construct($storage, $isAvailable = true) {
if ($storage instanceof \OC\Files\Storage\Storage) {
$this->storageId = $storage->getId();
} else {
$this->storageId = $storage;
}
$this->storageId = self::adjustStorageId($this->storageId);
if ($row = self::getStorageById($this->storageId)) {
$this->numericId = (int)$row['numeric_id'];
} else {
$connection = \OC::$server->getDatabaseConnection();
$available = $isAvailable ? 1 : 0;
if ($connection->insertIfNotExist('*PREFIX*storages', ['id' => $this->storageId, 'available' => $available])) {
$this->numericId = (int)$connection->lastInsertId('*PREFIX*storages');
} else {
if ($row = self::getStorageById($this->storageId)) {
$this->numericId = (int)$row['numeric_id'];
} else {
throw new \RuntimeException('Storage could neither be inserted nor be selected from the database');
}
}
}
}
/**
* @param string $storageId
* @return array
*/
public static function getStorageById($storageId) {
return self::getGlobalCache()->getStorageInfo($storageId);
}
/**
* Adjusts the storage id to use md5 if too long
* @param string $storageId storage id
* @return string unchanged $storageId if its length is less than 64 characters,
* else returns the md5 of $storageId
*/
public static function adjustStorageId($storageId) {
if (strlen($storageId) > 64) {
return md5($storageId);
}
return $storageId;
}
/**
* Get the numeric id for the storage
*
* @return int
*/
public function getNumericId() {
return $this->numericId;
}
/**
* Get the string id for the storage
*
* @param int $numericId
* @return string|null either the storage id string or null if the numeric id is not known
*/
public static function getStorageId($numericId) {
$sql = 'SELECT `id` FROM `*PREFIX*storages` WHERE `numeric_id` = ?';
$result = \OC_DB::executeAudited($sql, array($numericId));
if ($row = $result->fetchRow()) {
return $row['id'];
} else {
return null;
}
}
/**
* Get the numeric of the storage with the provided string id
*
* @param $storageId
* @return int|null either the numeric storage id or null if the storage id is not knwon
*/
public static function getNumericStorageId($storageId) {
$storageId = self::adjustStorageId($storageId);
if ($row = self::getStorageById($storageId)) {
return (int)$row['numeric_id'];
} else {
return null;
}
}
/**
* @return array|null [ available, last_checked ]
*/
public function getAvailability() {
if ($row = self::getStorageById($this->storageId)) {
return [
'available' => ((int)$row['available'] === 1),
'last_checked' => $row['last_checked']
];
} else {
return null;
}
}
/**
* @param bool $isAvailable
*/
public function setAvailability($isAvailable) {
$sql = 'UPDATE `*PREFIX*storages` SET `available` = ?, `last_checked` = ? WHERE `id` = ?';
$available = $isAvailable ? 1 : 0;
\OC_DB::executeAudited($sql, array($available, time(), $this->storageId));
}
/**
* Check if a string storage id is known
*
* @param string $storageId
* @return bool
*/
public static function exists($storageId) {
return !is_null(self::getNumericStorageId($storageId));
}
/**
* remove the entry for the storage
*
* @param string $storageId
*/
public static function remove($storageId) {
$storageId = self::adjustStorageId($storageId);
$numericId = self::getNumericStorageId($storageId);
$sql = 'DELETE FROM `*PREFIX*storages` WHERE `id` = ?';
\OC_DB::executeAudited($sql, array($storageId));
if (!is_null($numericId)) {
$sql = 'DELETE FROM `*PREFIX*filecache` WHERE `storage` = ?';
\OC_DB::executeAudited($sql, array($numericId));
}
}
}