nextcloud/apps/files_sharing/lib/cache.php

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<?php
/**
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* ownCloud
*
* @author Bjoern Schiessle, Michael Gapczynski
* @copyright 2012 Michael Gapczynski <mtgap@owncloud.com>
* 2014 Bjoern Schiessle <schiessle@owncloud.com>
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*
* 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;
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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();
/**
* @param \OC\Files\Storage\Shared $storage
*/
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public function __construct($storage) {
$this->storage = $storage;
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}
/**
* Get the source cache of a shared file or folder
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*
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* @param string $target Shared target file path
* @return \OC\Files\Cache\Cache
*/
private function getSourceCache($target) {
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if ($target === false || $target === $this->storage->getMountPoint()) {
$target = '';
}
$source = \OC_Share_Backend_File::getSource($target, $this->storage->getMountPoint(), $this->storage->getItemType());
if (isset($source['path']) && isset($source['fileOwner'])) {
\OC\Files\Filesystem::initMountPoints($source['fileOwner']);
$mounts = \OC\Files\Filesystem::getMountByNumericId($source['storage']);
if (is_array($mounts) and !empty($mounts)) {
$fullPath = $mounts[0]->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 $cache;
}
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}
}
return false;
}
public function getNumericStorageId() {
if (isset($this->numericId)) {
return $this->numericId;
} else {
return false;
}
}
/**
* get the stored metadata of a file or folder
*
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* @param string|int $file
* @return array
*/
public function get($file) {
if (is_string($file)) {
$cache = $this->getSourceCache($file);
if ($cache) {
$data = $cache->get($this->files[$file]);
if ($data) {
$data['displayname_owner'] = \OC_User::getDisplayName($this->storage->getSharedFrom());
$data['path'] = $file;
if ($file === '') {
$data['is_share_mount_point'] = true;
}
$data['uid_owner'] = $this->storage->getOwner($file);
if (isset($data['permissions'])) {
$data['permissions'] &= $this->storage->getPermissions($file);
} else {
$data['permissions'] = $this->storage->getPermissions($file);
}
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}
return $data;
}
} else {
$sourceId = $file;
// if we are at the root of the mount point we want to return the
// cache information for the source item
if (!is_int($sourceId) || $sourceId === 0) {
$sourceId = $this->storage->getSourceId();
}
$query = \OC_DB::prepare(
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'SELECT `fileid`, `storage`, `path`, `parent`, `name`, `mimetype`, `mimepart`,'
. ' `size`, `mtime`, `encrypted`, `unencrypted_size`, `storage_mtime`, `etag`, `permissions`'
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. ' FROM `*PREFIX*filecache` WHERE `fileid` = ?');
$result = $query->execute(array($sourceId));
$data = $result->fetchRow();
$data['fileid'] = (int)$data['fileid'];
$data['mtime'] = (int)$data['mtime'];
$data['storage_mtime'] = (int)$data['storage_mtime'];
$data['encrypted'] = (bool)$data['encrypted'];
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$data['mimetype'] = $this->getMimetype($data['mimetype']);
$data['mimepart'] = $this->getMimetype($data['mimepart']);
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if ($data['storage_mtime'] === 0) {
$data['storage_mtime'] = $data['mtime'];
}
if ($data['encrypted'] or ($data['unencrypted_size'] > 0 and $data['mimetype'] === 'httpd/unix-directory')) {
$data['encrypted_size'] = (int)$data['size'];
$data['size'] = (int)$data['unencrypted_size'];
} else {
$data['size'] = (int)$data['size'];
}
$data['permissions'] = (int)$data['permissions'];
if (!is_int($file) || $file === 0) {
$data['path'] = '';
$data['name'] = basename($this->storage->getMountPoint());
$data['is_share_mount_point'] = true;
}
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$data['permissions'] &= $this->storage->getPermissions('');
return $data;
}
return false;
}
/**
* get the metadata of all files stored in $folder
*
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* @param string $folderId
* @return array
*/
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public function getFolderContentsById($folderId) {
$cache = $this->getSourceCache('');
if ($cache) {
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$owner = $this->storage->getSharedFrom();
$parentPath = $this->getPathById($folderId);
if ($parentPath !== '') {
$parentPath .= '/';
}
$sourceFolderContent = $cache->getFolderContentsById($folderId);
foreach ($sourceFolderContent as &$c) {
$c['path'] = ltrim($parentPath . $c['name'], '/');
$c['uid_owner'] = $owner;
$c['displayname_owner'] = \OC_User::getDisplayName($owner);
$c['permissions'] = $c['permissions'] & $this->storage->getPermissions(false);
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}
return $sourceFolderContent;
}
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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 $data) {
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$file = ($file === false) ? '' : $file;
if ($cache = $this->getSourceCache($file)) {
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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) {
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if ($file === false) {
return $this->storage->getSourceId();
}
$cache = $this->getSourceCache($file);
if ($cache) {
return $cache->getId($this->files[$file]);
}
return -1;
}
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/**
* 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) {
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$file = ($file === false) ? '' : $file;
if ($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, $this->storage->getMountPoint(), $this->storage->getItemType());
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if ($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]);
}
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return self::NOT_FOUND;
}
/**
* search for files matching $pattern
*
* @param string $pattern
* @return array of file data
*/
public function search($pattern) {
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$pattern = trim($pattern, '%');
$normalizedPattern = $this->normalize($pattern);
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$result = array();
$exploreDirs = array('');
while (count($exploreDirs) > 0) {
$dir = array_pop($exploreDirs);
$files = $this->getFolderContents($dir);
// no results?
if (!$files) {
// maybe it's a single shared file
$file = $this->get('');
if ($normalizedPattern === '' || stristr($file['name'], $normalizedPattern) !== false) {
$result[] = $file;
}
continue;
}
foreach ($files as $file) {
if ($normalizedPattern === '' || stristr($file['name'], $normalizedPattern) !== false) {
$result[] = $file;
}
if ($file['mimetype'] === 'httpd/unix-directory') {
$exploreDirs[] = ltrim($dir . '/' . $file['name'], '/');
}
}
}
return $result;
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}
/**
* search for files by mimetype
*
* @param string $mimetype
* @return array
*/
public function searchByMime($mimetype) {
$mimepart = null;
if (strpos($mimetype, '/') === false) {
$mimepart = $mimetype;
$mimetype = null;
}
$result = array();
$exploreDirs = array('');
while (count($exploreDirs) > 0) {
$dir = array_pop($exploreDirs);
$files = $this->getFolderContents($dir);
// no results?
if (!$files) {
// maybe it's a single shared file
$file = $this->get('');
if (($mimepart && $file['mimepart'] === $mimepart) || ($mimetype && $file['mimetype'] === $mimetype)) {
$result[] = $file;
}
continue;
}
foreach ($files as $file) {
if ($file['mimetype'] === 'httpd/unix-directory') {
$exploreDirs[] = ltrim($dir . '/' . $file['name'], '/');
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} else if (($mimepart && $file['mimepart'] === $mimepart) || ($mimetype && $file['mimetype'] === $mimetype)) {
$result[] = $file;
}
}
}
return $result;
}
/**
* Checks whether the given file has the given tag.
*
* @param \OCP\ITags $tagger
* @param array $fileData file data
* @param string $tag tag to check for
* @return boolean true if the given file has the expected tag,
* false otherwise
*/
private function hasTag($tagger, $fileData, $tag) {
$tags = $tagger->getTagsForObjects(array((int)$fileData['fileid']));
return (!empty($tags) && in_array($tag, current($tags)));
}
/**
* search for files by tag
*
* @param string|int $tag tag to search for
* @param string $userId owner of the tags
* @return array file data
*/
public function searchByTag($tag, $userId) {
// TODO: inject this
$tagger = \OC::$server->getTagManager()->load('files', null, null, $userId);
$result = array();
$exploreDirs = array('');
// check if root is tagged
$file = $this->get('');
if ($this->hasTag($tagger, $file, $tag)) {
$result[] = $file;
}
// FIXME: this is so wrong and unefficient, need to replace with actual DB queries
while (count($exploreDirs) > 0) {
$dir = array_pop($exploreDirs);
$files = $this->getFolderContents($dir);
if (!$files) {
continue;
}
foreach ($files as $file) {
if ($this->hasTag($tagger, $file, $tag)) {
$result[] = $file;
}
if ($file['mimetype'] === 'httpd/unix-directory') {
$exploreDirs[] = ltrim($dir . '/' . $file['name'], '/');
}
}
}
return $result;
}
/**
* get the size of a folder and set it in the cache
*
* @param string $path
* @param array $entry (optional) meta data of the folder
* @return int
*/
public function calculateFolderSize($path, $entry = null) {
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$path = ($path === false) ? '' : $path;
if ($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 boolean the path of the folder or false when no folder matched
*/
public function getIncomplete() {
return false;
}
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/**
* get the path of a file on this storage relative to the mount point by it's id
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*
* @param int $id
* @param string $pathEnd (optional) used internally for recursive calls
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* @return string|null
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*/
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public function getPathById($id, $pathEnd = '') {
// direct shares are easy
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if ($id === $this->storage->getSourceId()) {
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return ltrim($pathEnd, '/');
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} else {
// if the item is a direct share we try and get the path of the parent and append the name of the item to it
list($parent, $name) = $this->getParentInfo($id);
if ($parent > 0) {
return $this->getPathById($parent, '/' . $name . $pathEnd);
} else {
return null;
}
}
}
/**
* @param integer $id
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* @return array
*/
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private function getParentInfo($id) {
$sql = 'SELECT `parent`, `name` FROM `*PREFIX*filecache` WHERE `fileid` = ?';
$query = \OC_DB::prepare($sql);
$result = $query->execute(array($id));
if ($row = $result->fetchRow()) {
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return array((int)$row['parent'], $row['name']);
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} else {
return array(-1, '');
}
}
}