nextcloud/apps/files_sharing/lib/cache.php

360 lines
9.5 KiB
PHP

<?php
/**
* ownCloud
*
* @author Michael Gapczynski
* @copyright 2012 Michael Gapczynski mtgap@owncloud.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library 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 along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
namespace OC\Files\Cache;
use OCP\Share_Backend_Collection;
/**
* Metadata cache for shared files
*
* don't use this class directly if you need to get metadata, use \OC\Files\Filesystem::getFileInfo instead
*/
class Shared_Cache extends Cache {
private $storage;
private $files = array();
public function __construct($storage) {
$this->storage = $storage;
}
/**
* @brief Get the source cache of a shared file or folder
* @param string $target Shared target file path
* @return \OC\Files\Cache\Cache
*/
private function getSourceCache($target) {
$source = \OC_Share_Backend_File::getSource($target);
if (isset($source['path']) && isset($source['fileOwner'])) {
\OC\Files\Filesystem::initMountPoints($source['fileOwner']);
$mount = \OC\Files\Filesystem::getMountByNumericId($source['storage']);
if (is_array($mount)) {
$fullPath = $mount[key($mount)]->getMountPoint().$source['path'];
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($fullPath);
if ($storage) {
$this->files[$target] = $internalPath;
$cache = $storage->getCache();
$this->storageId = $storage->getId();
$this->numericId = $cache->getNumericStorageId();
return $cache;
}
}
}
return false;
}
public function getNumericStorageId() {
if (isset($this->numericId)) {
return $this->numericId;
} else {
return false;
}
}
/**
* get the stored metadata of a file or folder
*
* @param string/int $file
* @return array
*/
public function get($file) {
if ($file == '') {
$data = \OCP\Share::getItemsSharedWith('file', \OC_Share_Backend_File::FORMAT_FILE_APP_ROOT);
$etag = \OCP\Config::getUserValue(\OCP\User::getUser(), 'files_sharing', 'etag');
if (!isset($etag)) {
$etag = $this->storage->getETag('');
\OCP\Config::setUserValue(\OCP\User::getUser(), 'files_sharing', 'etag', $etag);
}
$data['etag'] = $etag;
return $data;
} else if (is_string($file)) {
if ($cache = $this->getSourceCache($file)) {
return $cache->get($this->files[$file]);
}
} else {
$query = \OC_DB::prepare(
'SELECT `fileid`, `storage`, `path`, `parent`, `name`, `mimetype`, `mimepart`,'
.' `size`, `mtime`, `encrypted`'
.' FROM `*PREFIX*filecache` WHERE `fileid` = ?');
$result = $query->execute(array($file));
$data = $result->fetchRow();
$data['fileid'] = (int)$data['fileid'];
$data['size'] = (int)$data['size'];
$data['mtime'] = (int)$data['mtime'];
$data['storage_mtime'] = (int)$data['storage_mtime'];
$data['encrypted'] = (bool)$data['encrypted'];
$data['mimetype'] = $this->getMimetype($data['mimetype']);
$data['mimepart'] = $this->getMimetype($data['mimepart']);
if ($data['storage_mtime'] === 0) {
$data['storage_mtime'] = $data['mtime'];
}
return $data;
}
return false;
}
/**
* get the metadata of all files stored in $folder
*
* @param string $folder
* @return array
*/
public function getFolderContents($folder) {
if ($folder == '') {
$files = \OCP\Share::getItemsSharedWith('file', \OC_Share_Backend_File::FORMAT_GET_FOLDER_CONTENTS);
foreach ($files as &$file) {
$file['mimetype'] = $this->getMimetype($file['mimetype']);
$file['mimepart'] = $this->getMimetype($file['mimepart']);
}
return $files;
} else {
if ($cache = $this->getSourceCache($folder)) {
return $cache->getFolderContents($this->files[$folder]);
}
}
return false;
}
/**
* store meta data for a file or folder
*
* @param string $file
* @param array $data
*
* @return int file id
*/
public function put($file, array $data) {
if ($file === '' && isset($data['etag'])) {
return \OCP\Config::setUserValue(\OCP\User::getUser(), 'files_sharing', 'etag', $data['etag']);
} else if ($cache = $this->getSourceCache($file)) {
return $cache->put($this->files[$file], $data);
}
return false;
}
/**
* get the file id for a file
*
* @param string $file
* @return int
*/
public function getId($file) {
if ($cache = $this->getSourceCache($file)) {
return $cache->getId($this->files[$file]);
}
return -1;
}
/**
* check if a file is available in the cache
*
* @param string $file
* @return bool
*/
public function inCache($file) {
if ($file == '') {
return true;
}
return parent::inCache($file);
}
/**
* remove a file or folder from the cache
*
* @param string $file
*/
public function remove($file) {
if ($cache = $this->getSourceCache($file)) {
$cache->remove($this->files[$file]);
}
}
/**
* Move a file or folder in the cache
*
* @param string $source
* @param string $target
*/
public function move($source, $target) {
if ($cache = $this->getSourceCache($source)) {
$file = \OC_Share_Backend_File::getSource($target);
if ($file && isset($file['path'])) {
$cache->move($this->files[$source], $file['path']);
}
}
}
/**
* remove all entries for files that are stored on the storage from the cache
*/
public function clear() {
// Not a valid action for Shared Cache
}
/**
* @param string $file
*
* @return int, Cache::NOT_FOUND, Cache::PARTIAL, Cache::SHALLOW or Cache::COMPLETE
*/
public function getStatus($file) {
if ($file == '') {
return self::COMPLETE;
}
if ($cache = $this->getSourceCache($file)) {
return $cache->getStatus($this->files[$file]);
}
return self::NOT_FOUND;
}
/**
* search for files matching $pattern
*
* @param string $pattern
* @return array of file data
*/
public function search($pattern) {
$where = '`name` LIKE ? AND ';
// normalize pattern
$value = $this->normalize($pattern);
return $this->searchWithWhere($where, $value);
}
/**
* search for files by mimetype
*
* @param string $mimetype
* @return array
*/
public function searchByMime($mimetype) {
if (strpos($mimetype, '/')) {
$where = '`mimetype` = ? AND ';
} else {
$where = '`mimepart` = ? AND ';
}
$value = $this->getMimetypeId($mimetype);
return $this->searchWithWhere($where, $value);
}
/**
* The maximum number of placeholders that can be used in an SQL query.
* Value MUST be <= 1000 for oracle:
* see ORA-01795 maximum number of expressions in a list is 1000
* FIXME we should get this from doctrine as other DBs allow a lot more placeholders
*/
const MAX_SQL_CHUNK_SIZE = 1000;
/**
* search for files with a custom where clause and value
* the $wherevalue will be array_merge()d with the file id chunks
*
* @param string $sqlwhere
* @param string $wherevalue
* @return array
*/
private function searchWithWhere($sqlwhere, $wherevalue, $chunksize = self::MAX_SQL_CHUNK_SIZE) {
$ids = $this->getAll();
$files = array();
// divide into chunks
$chunks = array_chunk($ids, $chunksize);
foreach ($chunks as $chunk) {
$placeholders = join(',', array_fill(0, count($chunk), '?'));
$sql = 'SELECT `fileid`, `storage`, `path`, `parent`, `name`, `mimetype`, `mimepart`, `size`, `mtime`,
`encrypted`, `unencrypted_size`, `etag`
FROM `*PREFIX*filecache` WHERE ' . $sqlwhere . ' `fileid` IN (' . $placeholders . ')';
$stmt = \OC_DB::prepare($sql);
$result = $stmt->execute(array_merge(array($wherevalue), $chunk));
while ($row = $result->fetchRow()) {
if (substr($row['path'], 0, 6) === 'files/') {
$row['path'] = substr($row['path'], 6); // remove 'files/' from path as it's relative to '/Shared'
}
$row['mimetype'] = $this->getMimetype($row['mimetype']);
$row['mimepart'] = $this->getMimetype($row['mimepart']);
$files[] = $row;
}
}
return $files;
}
/**
* get the size of a folder and set it in the cache
*
* @param string $path
* @return int
*/
public function calculateFolderSize($path) {
if ($cache = $this->getSourceCache($path)) {
return $cache->calculateFolderSize($this->files[$path]);
}
return 0;
}
/**
* get all file ids on the files on the storage
*
* @return int[]
*/
public function getAll() {
$ids = \OCP\Share::getItemsSharedWith('file', \OC_Share_Backend_File::FORMAT_GET_ALL);
$folderBackend = \OCP\Share::getBackend('folder');
if ($folderBackend instanceof Share_Backend_Collection) {
foreach ($ids as $file) {
/** @var $folderBackend Share_Backend_Collection */
$children = $folderBackend->getChildren($file);
foreach ($children as $child) {
$ids[] = (int)$child['source'];
}
}
}
return $ids;
}
/**
* find a folder in the cache which has not been fully scanned
*
* If multiply incomplete folders are in the cache, the one with the highest id will be returned,
* use the one with the highest id gives the best result with the background scanner, since that is most
* likely the folder where we stopped scanning previously
*
* @return string|bool the path of the folder or false when no folder matched
*/
public function getIncomplete() {
return false;
}
}