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<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\Files\Storage;
use OCP\Files\Mount\IMountPoint;
use OCP\Files\Storage\IConstructableStorage;
use OCP\Files\Storage\IStorage;
use OCP\Files\Storage\IStorageFactory;
use Psr\Log\LoggerInterface;
class StorageFactory implements IStorageFactory {
/**
* @var array[] [$name=>['priority'=>$priority, 'wrapper'=>$callable] $storageWrappers
*/
private $storageWrappers = [];
public function addStorageWrapper(string $wrapperName, callable $callback, int $priority = 50, array $existingMounts = []): bool {
if (isset($this->storageWrappers[$wrapperName])) {
return false;
}
// apply to existing mounts before registering it to prevent applying it double in MountPoint::createStorage
foreach ($existingMounts as $mount) {
$mount->wrapStorage($callback);
}
$this->storageWrappers[$wrapperName] = ['wrapper' => $callback, 'priority' => $priority];
return true;
}
/**
* Remove a storage wrapper by name.
* Note: internal method only to be used for cleanup
*
* @internal
*/
public function removeStorageWrapper(string $wrapperName): void {
unset($this->storageWrappers[$wrapperName]);
}
/**
* Create an instance of a storage and apply the registered storage wrappers
*/
public function getInstance(IMountPoint $mountPoint, string $class, array $arguments): IStorage {
if (!is_a($class, IConstructableStorage::class, true)) {
\OCP\Server::get(LoggerInterface::class)->warning('Building a storage not implementing IConstructableStorage is deprecated since 31.0.0', ['class' => $class]);
}
return $this->wrap($mountPoint, new $class($arguments));
}
public function wrap(IMountPoint $mountPoint, IStorage $storage): IStorage {
$wrappers = array_values($this->storageWrappers);
usort($wrappers, function ($a, $b) {
return $b['priority'] - $a['priority'];
});
/** @var callable[] $wrappers */
$wrappers = array_map(function ($wrapper) {
return $wrapper['wrapper'];
}, $wrappers);
foreach ($wrappers as $wrapper) {
$storage = $wrapper($mountPoint->getMountPoint(), $storage, $mountPoint);
if (!($storage instanceof IStorage)) {
throw new \Exception('Invalid result from storage wrapper');
}
}
return $storage;
}
}
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