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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\Type;
use OC\DB\Exceptions\DbalException;
use OCP\AppFramework\Db\TTransactional;
use OCP\DB\Exception as DBException;
use OCP\Files\IMimeTypeLoader;
use OCP\IDBConnection;
/**
* Mimetype database loader
*
* @package OC\Files\Type
*/
class Loader implements IMimeTypeLoader {
use TTransactional;
/** @psalm-var array<int, string> */
protected array $mimetypes;
/** @psalm-var array<string, int> */
protected array $mimetypeIds;
/**
* @param IDBConnection $dbConnection
*/
public function __construct(
private IDBConnection $dbConnection,
) {
$this->mimetypes = [];
$this->mimetypeIds = [];
}
/**
* Get a mimetype from its ID
*/
public function getMimetypeById(int $id): ?string {
if (!$this->mimetypes) {
$this->loadMimetypes();
}
if (isset($this->mimetypes[$id])) {
return $this->mimetypes[$id];
}
return null;
}
/**
* Get a mimetype ID, adding the mimetype to the DB if it does not exist
*/
public function getId(string $mimetype): int {
if (!$this->mimetypeIds) {
$this->loadMimetypes();
}
if (isset($this->mimetypeIds[$mimetype])) {
return $this->mimetypeIds[$mimetype];
}
return $this->store($mimetype);
}
/**
* Test if a mimetype exists in the database
*/
public function exists(string $mimetype): bool {
if (!$this->mimetypeIds) {
$this->loadMimetypes();
}
return isset($this->mimetypeIds[$mimetype]);
}
/**
* Clear all loaded mimetypes, allow for re-loading
*/
public function reset(): void {
$this->mimetypes = [];
$this->mimetypeIds = [];
}
/**
* Store a mimetype in the DB
*
* @param string $mimetype
* @return int inserted ID
*/
protected function store(string $mimetype): int {
try {
$mimetypeId = $this->atomic(function () use ($mimetype) {
$insert = $this->dbConnection->getQueryBuilder();
$insert->insert('mimetypes')
->values([
'mimetype' => $insert->createNamedParameter($mimetype)
])
->executeStatement();
return $insert->getLastInsertId();
}, $this->dbConnection);
} catch (DbalException $e) {
if ($e->getReason() !== DBException::REASON_UNIQUE_CONSTRAINT_VIOLATION) {
throw $e;
}
$qb = $this->dbConnection->getQueryBuilder();
$qb->select('id')
->from('mimetypes')
->where($qb->expr()->eq('mimetype', $qb->createNamedParameter($mimetype)));
$result = $qb->executeQuery();
$id = $result->fetchOne();
$result->closeCursor();
if ($id === false) {
throw new \Exception("Database threw an unique constraint on inserting a new mimetype, but couldn't return the ID for this very mimetype");
}
$mimetypeId = (int)$id;
}
$this->mimetypes[$mimetypeId] = $mimetype;
$this->mimetypeIds[$mimetype] = $mimetypeId;
return $mimetypeId;
}
/**
* Load all mimetypes from DB
*/
private function loadMimetypes(): void {
$qb = $this->dbConnection->getQueryBuilder();
$qb->select('id', 'mimetype')
->from('mimetypes');
$result = $qb->executeQuery();
$results = $result->fetchAll();
$result->closeCursor();
foreach ($results as $row) {
$this->mimetypes[(int)$row['id']] = $row['mimetype'];
$this->mimetypeIds[$row['mimetype']] = (int)$row['id'];
}
}
/**
* Update filecache mimetype based on file extension
*
* @return int number of changed rows
*/
public function updateFilecache(string $ext, int $mimeTypeId): int {
$folderMimeTypeId = $this->getId('httpd/unix-directory');
$update = $this->dbConnection->getQueryBuilder();
$update->update('filecache')
->set('mimetype', $update->createNamedParameter($mimeTypeId))
->where($update->expr()->neq(
'mimetype', $update->createNamedParameter($mimeTypeId)
))
->andWhere($update->expr()->neq(
'mimetype', $update->createNamedParameter($folderMimeTypeId)
))
->andWhere($update->expr()->like(
$update->func()->lower('name'),
$update->createNamedParameter('%' . $this->dbConnection->escapeLikeParameter('.' . $ext))
));
return $update->executeStatement();
}
}
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