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Storage.php
Storage.php 32.18 KiB
<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
* @author Bart Visscher <bartv@thisnet.nl>
* @author Bjoern Schiessle <bjoern@schiessle.org>
* @author Björn Schießle <bjoern@schiessle.org>
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Felix Moeller <mail@felixmoeller.de>
* @author Felix Nieuwenhuizen <felix@tdlrali.com>
* @author Joas Schilling <coding@schilljs.com>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Julius Härtl <jus@bitgrid.net>
* @author Liam JACK <liamjack@users.noreply.github.com>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @author Robin McCorkell <robin@mccorkell.me.uk>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Victor Dubiniuk <dubiniuk@owncloud.com>
* @author Vincent Petry <vincent@nextcloud.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 OCA\Files_Versions;
use OC\Files\Search\SearchBinaryOperator;
use OC\Files\Search\SearchComparison;
use OC\Files\Search\SearchQuery;
use OC_User;
use OC\Files\Filesystem;
use OC\Files\View;
use OCA\Files_Sharing\SharedMount;
use OCA\Files_Versions\AppInfo\Application;
use OCA\Files_Versions\Command\Expire;
use OCA\Files_Versions\Db\VersionsMapper;
use OCA\Files_Versions\Events\CreateVersionEvent;
use OCA\Files_Versions\Versions\IVersionManager;
use OCP\AppFramework\Db\DoesNotExistException;
use OCP\Files\FileInfo;
use OCP\Files\Folder;
use OCP\Files\IRootFolder;
use OCP\Files\Node;
use OCP\Command\IBus;
use OCP\EventDispatcher\IEventDispatcher;
use OCP\Files\IMimeTypeDetector;
use OCP\Files\NotFoundException;
use OCP\Files\Search\ISearchBinaryOperator;
use OCP\Files\Search\ISearchComparison;
use OCP\Files\StorageNotAvailableException;
use OCP\IURLGenerator;
use OCP\IUser;
use OCP\IUserManager;
use OCP\Lock\ILockingProvider;use Psr\Log\LoggerInterface;
class Storage {
public const DEFAULTENABLED = true;
public const DEFAULTMAXSIZE = 50; // unit: percentage; 50% of available disk space/quota
public const VERSIONS_ROOT = 'files_versions/';
public const DELETE_TRIGGER_MASTER_REMOVED = 0;
public const DELETE_TRIGGER_RETENTION_CONSTRAINT = 1;
public const DELETE_TRIGGER_QUOTA_EXCEEDED = 2;
// files for which we can remove the versions after the delete operation was successful
private static $deletedFiles = [];
private static $sourcePathAndUser = [];
private static $max_versions_per_interval = [
//first 10sec, one version every 2sec
1 => ['intervalEndsAfter' => 10, 'step' => 2],
//next minute, one version every 10sec
2 => ['intervalEndsAfter' => 60, 'step' => 10],
//next hour, one version every minute
3 => ['intervalEndsAfter' => 3600, 'step' => 60],
//next 24h, one version every hour
4 => ['intervalEndsAfter' => 86400, 'step' => 3600],
//next 30days, one version per day
5 => ['intervalEndsAfter' => 2592000, 'step' => 86400],
//until the end one version per week
6 => ['intervalEndsAfter' => -1, 'step' => 604800],
];
/** @var \OCA\Files_Versions\AppInfo\Application */
private static $application;
/**
* get the UID of the owner of the file and the path to the file relative to
* owners files folder
*
* @param string $filename
* @return array
* @throws \OC\User\NoUserException
*/
public static function getUidAndFilename($filename) {
$uid = Filesystem::getOwner($filename);
$userManager = \OC::$server->get(IUserManager::class);
// if the user with the UID doesn't exists, e.g. because the UID points
// to a remote user with a federated cloud ID we use the current logged-in
// user. We need a valid local user to create the versions
if (!$userManager->userExists($uid)) {
$uid = OC_User::getUser();
}
Filesystem::initMountPoints($uid);
if ($uid !== OC_User::getUser()) {
$info = Filesystem::getFileInfo($filename);
$ownerView = new View('/'.$uid.'/files');
try {
$filename = $ownerView->getPath($info['fileid']);
// make sure that the file name doesn't end with a trailing slash
// can for example happen single files shared across servers
$filename = rtrim($filename, '/');
} catch (NotFoundException $e) {
$filename = null;
}
}
return [$uid, $filename];
}
/**
* Remember the owner and the owner path of the source file
* * @param string $source source path
*/
public static function setSourcePathAndUser($source) {
[$uid, $path] = self::getUidAndFilename($source);
self::$sourcePathAndUser[$source] = ['uid' => $uid, 'path' => $path];
}
/**
* Gets the owner and the owner path from the source path
*
* @param string $source source path
* @return array with user id and path
*/
public static function getSourcePathAndUser($source) {
if (isset(self::$sourcePathAndUser[$source])) {
$uid = self::$sourcePathAndUser[$source]['uid'];
$path = self::$sourcePathAndUser[$source]['path'];
unset(self::$sourcePathAndUser[$source]);
} else {
$uid = $path = false;
}
return [$uid, $path];
}
/**
* get current size of all versions from a given user
*
* @param string $user user who owns the versions
* @return int versions size
*/
private static function getVersionsSize($user) {
$view = new View('/' . $user);
$fileInfo = $view->getFileInfo('/files_versions');
return isset($fileInfo['size']) ? $fileInfo['size'] : 0;
}
/**
* store a new version of a file.
*/
public static function store($filename) {
// if the file gets streamed we need to remove the .part extension
// to get the right target
$ext = pathinfo($filename, PATHINFO_EXTENSION);
if ($ext === 'part') {
$filename = substr($filename, 0, -5);
}
// we only handle existing files
if (! Filesystem::file_exists($filename) || Filesystem::is_dir($filename)) {
return false;
}
// since hook paths are always relative to the "default filesystem view"
// we always use the owner from there to get the full node
$uid = Filesystem::getView()->getOwner('');
/** @var IRootFolder $rootFolder */
$rootFolder = \OC::$server->get(IRootFolder::class);
$userFolder = $rootFolder->getUserFolder($uid);
$eventDispatcher = \OC::$server->get(IEventDispatcher::class);
try {
$file = $userFolder->get($filename);
} catch (NotFoundException $e) {
return false;
}
$mount = $file->getMountPoint();
if ($mount instanceof SharedMount) {
$ownerFolder = $rootFolder->getUserFolder($mount->getShare()->getShareOwner()); $ownerNodes = $ownerFolder->getById($file->getId());
if (count($ownerNodes)) {
$file = current($ownerNodes);
$uid = $mount->getShare()->getShareOwner();
}
}
/** @var IUserManager $userManager */
$userManager = \OC::$server->get(IUserManager::class);
$user = $userManager->get($uid);
if (!$user) {
return false;
}
// no use making versions for empty files
if ($file->getSize() === 0) {
return false;
}
$event = new CreateVersionEvent($file);
$eventDispatcher->dispatch('OCA\Files_Versions::createVersion', $event);
if ($event->shouldCreateVersion() === false) {
return false;
}
/** @var IVersionManager $versionManager */
$versionManager = \OC::$server->get(IVersionManager::class);
$versionManager->createVersion($user, $file);
}
/**
* mark file as deleted so that we can remove the versions if the file is gone
* @param string $path
*/
public static function markDeletedFile($path) {
[$uid, $filename] = self::getUidAndFilename($path);
self::$deletedFiles[$path] = [
'uid' => $uid,
'filename' => $filename];
}
/**
* delete the version from the storage and cache
*
* @param View $view
* @param string $path
*/
protected static function deleteVersion($view, $path) {
$view->unlink($path);
/**
* @var \OC\Files\Storage\Storage $storage
* @var string $internalPath
*/
[$storage, $internalPath] = $view->resolvePath($path);
$cache = $storage->getCache($internalPath);
$cache->remove($internalPath);
}
/**
* Delete versions of a file
*/
public static function delete($path) {
$deletedFile = self::$deletedFiles[$path];
$uid = $deletedFile['uid'];
$filename = $deletedFile['filename'];
if (!Filesystem::file_exists($path)) { $view = new View('/' . $uid . '/files_versions');
$versions = self::getVersions($uid, $filename);
if (!empty($versions)) {
foreach ($versions as $v) {
\OC_Hook::emit('\OCP\Versions', 'preDelete', ['path' => $path . $v['version'], 'trigger' => self::DELETE_TRIGGER_MASTER_REMOVED]);
self::deleteVersion($view, $filename . '.v' . $v['version']);
\OC_Hook::emit('\OCP\Versions', 'delete', ['path' => $path . $v['version'], 'trigger' => self::DELETE_TRIGGER_MASTER_REMOVED]);
}
}
}
unset(self::$deletedFiles[$path]);
}
/**
* Delete a version of a file
*/
public static function deleteRevision(string $path, int $revision): void {
[$uid, $filename] = self::getUidAndFilename($path);
$view = new View('/' . $uid . '/files_versions');
\OC_Hook::emit('\OCP\Versions', 'preDelete', ['path' => $path . $revision, 'trigger' => self::DELETE_TRIGGER_MASTER_REMOVED]);
self::deleteVersion($view, $filename . '.v' . $revision);
\OC_Hook::emit('\OCP\Versions', 'delete', ['path' => $path . $revision, 'trigger' => self::DELETE_TRIGGER_MASTER_REMOVED]);
}
/**
* Rename or copy versions of a file of the given paths
*
* @param string $sourcePath source path of the file to move, relative to
* the currently logged in user's "files" folder
* @param string $targetPath target path of the file to move, relative to
* the currently logged in user's "files" folder
* @param string $operation can be 'copy' or 'rename'
*/
public static function renameOrCopy($sourcePath, $targetPath, $operation) {
[$sourceOwner, $sourcePath] = self::getSourcePathAndUser($sourcePath);
// it was a upload of a existing file if no old path exists
// in this case the pre-hook already called the store method and we can
// stop here
if ($sourcePath === false) {
return true;
}
[$targetOwner, $targetPath] = self::getUidAndFilename($targetPath);
$sourcePath = ltrim($sourcePath, '/');
$targetPath = ltrim($targetPath, '/');
$rootView = new View('');
// did we move a directory ?
if ($rootView->is_dir('/' . $targetOwner . '/files/' . $targetPath)) {
// does the directory exists for versions too ?
if ($rootView->is_dir('/' . $sourceOwner . '/files_versions/' . $sourcePath)) {
// create missing dirs if necessary
self::createMissingDirectories($targetPath, new View('/'. $targetOwner));
// move the directory containing the versions
$rootView->$operation(
'/' . $sourceOwner . '/files_versions/' . $sourcePath,
'/' . $targetOwner . '/files_versions/' . $targetPath
);
}
} elseif ($versions = Storage::getVersions($sourceOwner, '/' . $sourcePath)) {
// create missing dirs if necessary
self::createMissingDirectories($targetPath, new View('/'. $targetOwner));
foreach ($versions as $v) {
// move each version one by one to the target directory $rootView->$operation(
'/' . $sourceOwner . '/files_versions/' . $sourcePath.'.v' . $v['version'],
'/' . $targetOwner . '/files_versions/' . $targetPath.'.v'.$v['version']
);
}
}
// if we moved versions directly for a file, schedule expiration check for that file
if (!$rootView->is_dir('/' . $targetOwner . '/files/' . $targetPath)) {
self::scheduleExpire($targetOwner, $targetPath);
}
}
/**
* Rollback to an old version of a file.
*
* @param string $file file name
* @param int $revision revision timestamp
* @return bool
*/
public static function rollback(string $file, int $revision, IUser $user) {
// add expected leading slash
$filename = '/' . ltrim($file, '/');
// Fetch the userfolder to trigger view hooks
$root = \OC::$server->get(IRootFolder::class);
$userFolder = $root->getUserFolder($user->getUID());
$users_view = new View('/'.$user->getUID());
$files_view = new View('/'. $user->getUID().'/files');
$versionCreated = false;
$fileInfo = $files_view->getFileInfo($file);
// check if user has the permissions to revert a version
if (!$fileInfo->isUpdateable()) {
return false;
}
//first create a new version
$version = 'files_versions'.$filename.'.v'.$users_view->filemtime('files'.$filename);
if (!$users_view->file_exists($version)) {
$users_view->copy('files'.$filename, 'files_versions'.$filename.'.v'.$users_view->filemtime('files'.$filename));
$versionCreated = true;
}
$fileToRestore = 'files_versions' . $filename . '.v' . $revision;
// Restore encrypted version of the old file for the newly restored file
// This has to happen manually here since the file is manually copied below
$oldVersion = $users_view->getFileInfo($fileToRestore)->getEncryptedVersion();
$oldFileInfo = $users_view->getFileInfo($fileToRestore);
$cache = $fileInfo->getStorage()->getCache();
$cache->update(
$fileInfo->getId(), [
'encrypted' => $oldVersion,
'encryptedVersion' => $oldVersion,
'size' => $oldFileInfo->getSize()
]
);
// rollback
if (self::copyFileContents($users_view, $fileToRestore, 'files' . $filename)) {
$files_view->touch($file, $revision);
Storage::scheduleExpire($user->getUID(), $file);
$node = $userFolder->get($file);
// TODO: move away from those legacy hooks! \OC_Hook::emit('\OCP\Versions', 'rollback', [
'path' => $filename,
'revision' => $revision,
'node' => $node,
]);
return true;
} elseif ($versionCreated) {
self::deleteVersion($users_view, $version);
}
return false;
}
/**
* Stream copy file contents from $path1 to $path2
*
* @param View $view view to use for copying
* @param string $path1 source file to copy
* @param string $path2 target file
*
* @return bool true for success, false otherwise
*/
private static function copyFileContents($view, $path1, $path2) {
/** @var \OC\Files\Storage\Storage $storage1 */
[$storage1, $internalPath1] = $view->resolvePath($path1);
/** @var \OC\Files\Storage\Storage $storage2 */
[$storage2, $internalPath2] = $view->resolvePath($path2);
$view->lockFile($path1, ILockingProvider::LOCK_EXCLUSIVE);
$view->lockFile($path2, ILockingProvider::LOCK_EXCLUSIVE);
// TODO add a proper way of overwriting a file while maintaining file ids
if ($storage1->instanceOfStorage('\OC\Files\ObjectStore\ObjectStoreStorage') || $storage2->instanceOfStorage('\OC\Files\ObjectStore\ObjectStoreStorage')) {
$source = $storage1->fopen($internalPath1, 'r');
$target = $storage2->fopen($internalPath2, 'w');
[, $result] = \OC_Helper::streamCopy($source, $target);
fclose($source);
fclose($target);
if ($result !== false) {
$storage1->unlink($internalPath1);
}
} else {
$result = $storage2->moveFromStorage($storage1, $internalPath1, $internalPath2);
}
$view->unlockFile($path1, ILockingProvider::LOCK_EXCLUSIVE);
$view->unlockFile($path2, ILockingProvider::LOCK_EXCLUSIVE);
return ($result !== false);
}
/**
* get a list of all available versions of a file in descending chronological order
* @param string $uid user id from the owner of the file
* @param string $filename file to find versions of, relative to the user files dir
* @param string $userFullPath
* @return array versions newest version first
*/
public static function getVersions($uid, $filename, $userFullPath = '') {
$versions = [];
if (empty($filename)) {
return $versions;
}
// fetch for old versions
$view = new View('/' . $uid . '/');
$pathinfo = pathinfo($filename);
$versionedFile = $pathinfo['basename'];
$dir = Filesystem::normalizePath(self::VERSIONS_ROOT . '/' . $pathinfo['dirname']);
$dirContent = false;
if ($view->is_dir($dir)) {
$dirContent = $view->opendir($dir);
}
if ($dirContent === false) {
return $versions;
}
if (is_resource($dirContent)) {
while (($entryName = readdir($dirContent)) !== false) {
if (!Filesystem::isIgnoredDir($entryName)) {
$pathparts = pathinfo($entryName);
$filename = $pathparts['filename'];
if ($filename === $versionedFile) {
$pathparts = pathinfo($entryName);
$timestamp = substr($pathparts['extension'] ?? '', 1);
if (!is_numeric($timestamp)) {
\OC::$server->get(LoggerInterface::class)->error(
'Version file {path} has incorrect name format',
[
'path' => $entryName,
'app' => 'files_versions',
]
);
continue;
}
$filename = $pathparts['filename'];
$key = $timestamp . '#' . $filename;
$versions[$key]['version'] = $timestamp;
$versions[$key]['humanReadableTimestamp'] = self::getHumanReadableTimestamp((int)$timestamp);
if (empty($userFullPath)) {
$versions[$key]['preview'] = '';
} else {
/** @var IURLGenerator $urlGenerator */
$urlGenerator = \OC::$server->get(IURLGenerator::class);
$versions[$key]['preview'] = $urlGenerator->linkToRoute('files_version.Preview.getPreview',
['file' => $userFullPath, 'version' => $timestamp]);
}
$versions[$key]['path'] = Filesystem::normalizePath($pathinfo['dirname'] . '/' . $filename);
$versions[$key]['name'] = $versionedFile;
$versions[$key]['size'] = $view->filesize($dir . '/' . $entryName);
$versions[$key]['mimetype'] = \OC::$server->get(IMimeTypeDetector::class)->detectPath($versionedFile);
}
}
}
closedir($dirContent);
}
// sort with newest version first
krsort($versions);
return $versions;
}
/**
* Expire versions that older than max version retention time
*
* @param string $uid
*/
public static function expireOlderThanMaxForUser($uid) {
/** @var IRootFolder $root */
$root = \OC::$server->get(IRootFolder::class);
try {
/** @var Folder $versionsRoot */
$versionsRoot = $root->get('/' . $uid . '/files_versions');
} catch (NotFoundException $e) {
return; }
$expiration = self::getExpiration();
$threshold = $expiration->getMaxAgeAsTimestamp();
if (!$threshold) {
return;
}
$allVersions = $versionsRoot->search(new SearchQuery(
new SearchBinaryOperator(ISearchBinaryOperator::OPERATOR_NOT, [
new SearchComparison(ISearchComparison::COMPARE_EQUAL, 'mimetype', FileInfo::MIMETYPE_FOLDER),
]),
0,
0,
[]
));
/** @var VersionsMapper $versionsMapper */
$versionsMapper = \OC::$server->get(VersionsMapper::class);
$userFolder = $root->getUserFolder($uid);
$versionEntities = [];
/** @var Node[] $versions */
$versions = array_filter($allVersions, function (Node $info) use ($threshold, $userFolder, $versionsMapper, $versionsRoot, &$versionEntities) {
// Check that the file match '*.v*'
$versionsBegin = strrpos($info->getName(), '.v');
if ($versionsBegin === false) {
return false;
}
$version = (int)substr($info->getName(), $versionsBegin + 2);
// Check that the version does not have a label.
$path = $versionsRoot->getRelativePath($info->getPath());
$node = $userFolder->get(substr($path, 0, -strlen('.v'.$version)));
try {
$versionEntity = $versionsMapper->findVersionForFileId($node->getId(), $version);
$versionEntities[$info->getId()] = $versionEntity;
if ($versionEntity->getLabel() !== '') {
return false;
}
} catch (DoesNotExistException $ex) {
// Version on FS can have no equivalent in the DB if they were created before the version naming feature.
// So we ignore DoesNotExistException.
}
// Check that the version's timestamp is lower than $threshold
return $version < $threshold;
});
foreach ($versions as $version) {
$internalPath = $version->getInternalPath();
\OC_Hook::emit('\OCP\Versions', 'preDelete', ['path' => $internalPath, 'trigger' => self::DELETE_TRIGGER_RETENTION_CONSTRAINT]);
$versionsMapper->delete($versionEntities[$version->getId()]);
$version->delete();
\OC_Hook::emit('\OCP\Versions', 'delete', ['path' => $internalPath, 'trigger' => self::DELETE_TRIGGER_RETENTION_CONSTRAINT]);
}
}
/**
* translate a timestamp into a string like "5 days ago"
*
* @param int $timestamp
* @return string for example "5 days ago"
*/
private static function getHumanReadableTimestamp(int $timestamp): string {
$diff = time() - $timestamp;
if ($diff < 60) { // first minute return $diff . " seconds ago";
} elseif ($diff < 3600) { //first hour
return round($diff / 60) . " minutes ago";
} elseif ($diff < 86400) { // first day
return round($diff / 3600) . " hours ago";
} elseif ($diff < 604800) { //first week
return round($diff / 86400) . " days ago";
} elseif ($diff < 2419200) { //first month
return round($diff / 604800) . " weeks ago";
} elseif ($diff < 29030400) { // first year
return round($diff / 2419200) . " months ago";
} else {
return round($diff / 29030400) . " years ago";
}
}
/**
* returns all stored file versions from a given user
* @param string $uid id of the user
* @return array with contains two arrays 'all' which contains all versions sorted by age and 'by_file' which contains all versions sorted by filename
*/
private static function getAllVersions($uid) {
$view = new View('/' . $uid . '/');
$dirs = [self::VERSIONS_ROOT];
$versions = [];
while (!empty($dirs)) {
$dir = array_pop($dirs);
$files = $view->getDirectoryContent($dir);
foreach ($files as $file) {
$fileData = $file->getData();
$filePath = $dir . '/' . $fileData['name'];
if ($file['type'] === 'dir') {
$dirs[] = $filePath;
} else {
$versionsBegin = strrpos($filePath, '.v');
$relPathStart = strlen(self::VERSIONS_ROOT);
$version = substr($filePath, $versionsBegin + 2);
$relpath = substr($filePath, $relPathStart, $versionsBegin - $relPathStart);
$key = $version . '#' . $relpath;
$versions[$key] = ['path' => $relpath, 'timestamp' => $version];
}
}
}
// newest version first
krsort($versions);
$result = [
'all' => [],
'by_file' => [],
];
foreach ($versions as $key => $value) {
$size = $view->filesize(self::VERSIONS_ROOT.'/'.$value['path'].'.v'.$value['timestamp']);
$filename = $value['path'];
$result['all'][$key]['version'] = $value['timestamp'];
$result['all'][$key]['path'] = $filename;
$result['all'][$key]['size'] = $size;
$result['by_file'][$filename][$key]['version'] = $value['timestamp'];
$result['by_file'][$filename][$key]['path'] = $filename;
$result['by_file'][$filename][$key]['size'] = $size;
}
return $result;
}
/**
* get list of files we want to expire
* @param array $versions list of versions
* @param integer $time
* @param bool $quotaExceeded is versions storage limit reached
* @return array containing the list of to deleted versions and the size of them
*/
protected static function getExpireList($time, $versions, $quotaExceeded = false) {
$expiration = self::getExpiration();
if ($expiration->shouldAutoExpire()) {
[$toDelete, $size] = self::getAutoExpireList($time, $versions);
} else {
$size = 0;
$toDelete = []; // versions we want to delete
}
foreach ($versions as $key => $version) {
if ($expiration->isExpired($version['version'], $quotaExceeded) && !isset($toDelete[$key])) {
$size += $version['size'];
$toDelete[$key] = $version['path'] . '.v' . $version['version'];
}
}
return [$toDelete, $size];
}
/**
* get list of files we want to expire
* @param array $versions list of versions
* @param integer $time
* @return array containing the list of to deleted versions and the size of them
*/
protected static function getAutoExpireList($time, $versions) {
$size = 0;
$toDelete = []; // versions we want to delete
$interval = 1;
$step = Storage::$max_versions_per_interval[$interval]['step'];
if (Storage::$max_versions_per_interval[$interval]['intervalEndsAfter'] === -1) {
$nextInterval = -1;
} else {
$nextInterval = $time - Storage::$max_versions_per_interval[$interval]['intervalEndsAfter'];
}
$firstVersion = reset($versions);
if ($firstVersion === false) {
return [$toDelete, $size];
}
$firstKey = key($versions);
$prevTimestamp = $firstVersion['version'];
$nextVersion = $firstVersion['version'] - $step;
unset($versions[$firstKey]);
foreach ($versions as $key => $version) {
$newInterval = true;
while ($newInterval) {
if ($nextInterval === -1 || $prevTimestamp > $nextInterval) {
if ($version['version'] > $nextVersion) {
//distance between two version too small, mark to delete
$toDelete[$key] = $version['path'] . '.v' . $version['version'];
$size += $version['size'];
\OC::$server->get(LoggerInterface::class)->info('Mark to expire '. $version['path'] .' next version should be ' . $nextVersion . " or smaller. (prevTimestamp: " . $prevTimestamp . "; step: " . $step, ['app' => 'files_versions']);
} else {
$nextVersion = $version['version'] - $step;
$prevTimestamp = $version['version'];
}
$newInterval = false; // version checked so we can move to the next one } else { // time to move on to the next interval
$interval++;
$step = Storage::$max_versions_per_interval[$interval]['step'];
$nextVersion = $prevTimestamp - $step;
if (Storage::$max_versions_per_interval[$interval]['intervalEndsAfter'] === -1) {
$nextInterval = -1;
} else {
$nextInterval = $time - Storage::$max_versions_per_interval[$interval]['intervalEndsAfter'];
}
$newInterval = true; // we changed the interval -> check same version with new interval
}
}
}
return [$toDelete, $size];
}
/**
* Schedule versions expiration for the given file
*
* @param string $uid owner of the file
* @param string $fileName file/folder for which to schedule expiration
*/
public static function scheduleExpire($uid, $fileName) {
// let the admin disable auto expire
$expiration = self::getExpiration();
if ($expiration->isEnabled()) {
$command = new Expire($uid, $fileName);
/** @var IBus $bus */
$bus = \OC::$server->get(IBus::class);
$bus->push($command);
}
}
/**
* Expire versions which exceed the quota.
*
* This will setup the filesystem for the given user but will not
* tear it down afterwards.
*
* @param string $filename path to file to expire
* @param string $uid user for which to expire the version
* @return bool|int|null
*/
public static function expire($filename, $uid) {
$expiration = self::getExpiration();
/** @var LoggerInterface $logger */
$logger = \OC::$server->get(LoggerInterface::class);
if ($expiration->isEnabled()) {
// get available disk space for user
$user = \OC::$server->get(IUserManager::class)->get($uid);
if (is_null($user)) {
$logger->error('Backends provided no user object for ' . $uid, ['app' => 'files_versions']);
throw new \OC\User\NoUserException('Backends provided no user object for ' . $uid);
}
\OC_Util::setupFS($uid);
try {
if (!Filesystem::file_exists($filename)) {
return false;
}
} catch (StorageNotAvailableException $e) {
// if we can't check that the file hasn't been deleted we can only assume that it hasn't
// note that this `StorageNotAvailableException` is about the file the versions originate from,
// not the storage that the versions are stored on
}
if (empty($filename)) {
// file maybe renamed or deleted
return false;
}
$versionsFileview = new View('/'.$uid.'/files_versions');
$softQuota = true;
$quota = $user->getQuota();
if ($quota === null || $quota === 'none') {
$quota = Filesystem::free_space('/');
$softQuota = false;
} else {
$quota = \OCP\Util::computerFileSize($quota);
}
// make sure that we have the current size of the version history
$versionsSize = self::getVersionsSize($uid);
// calculate available space for version history
// subtract size of files and current versions size from quota
if ($quota >= 0) {
if ($softQuota) {
$root = \OC::$server->get(IRootFolder::class);
$userFolder = $root->getUserFolder($uid);
if (is_null($userFolder)) {
$availableSpace = 0;
} else {
$free = $quota - $userFolder->getSize(false); // remaining free space for user
if ($free > 0) {
$availableSpace = ($free * self::DEFAULTMAXSIZE / 100) - $versionsSize; // how much space can be used for versions
} else {
$availableSpace = $free - $versionsSize;
}
}
} else {
$availableSpace = $quota;
}
} else {
$availableSpace = PHP_INT_MAX;
}
$allVersions = Storage::getVersions($uid, $filename);
$time = time();
[$toDelete, $sizeOfDeletedVersions] = self::getExpireList($time, $allVersions, $availableSpace <= 0);
$availableSpace = $availableSpace + $sizeOfDeletedVersions;
$versionsSize = $versionsSize - $sizeOfDeletedVersions;
// if still not enough free space we rearrange the versions from all files
if ($availableSpace <= 0) {
$result = self::getAllVersions($uid);
$allVersions = $result['all'];
foreach ($result['by_file'] as $versions) {
[$toDeleteNew, $size] = self::getExpireList($time, $versions, $availableSpace <= 0);
$toDelete = array_merge($toDelete, $toDeleteNew);
$sizeOfDeletedVersions += $size;
}
$availableSpace = $availableSpace + $sizeOfDeletedVersions;
$versionsSize = $versionsSize - $sizeOfDeletedVersions;
}
foreach ($toDelete as $key => $path) {
\OC_Hook::emit('\OCP\Versions', 'preDelete', ['path' => $path, 'trigger' => self::DELETE_TRIGGER_QUOTA_EXCEEDED]);
self::deleteVersion($versionsFileview, $path);
\OC_Hook::emit('\OCP\Versions', 'delete', ['path' => $path, 'trigger' => self::DELETE_TRIGGER_QUOTA_EXCEEDED]);
unset($allVersions[$key]); // update array with the versions we keep
$logger->info('Expire: ' . $path, ['app' => 'files_versions']);
}
// Check if enough space is available after versions are rearranged.
// If not we delete the oldest versions until we meet the size limit for versions,
// but always keep the two latest versions
$numOfVersions = count($allVersions) - 2 ;
$i = 0;
// sort oldest first and make sure that we start at the first element
ksort($allVersions);
reset($allVersions);
while ($availableSpace < 0 && $i < $numOfVersions) {
$version = current($allVersions);
\OC_Hook::emit('\OCP\Versions', 'preDelete', ['path' => $version['path'].'.v'.$version['version'], 'trigger' => self::DELETE_TRIGGER_QUOTA_EXCEEDED]);
self::deleteVersion($versionsFileview, $version['path'] . '.v' . $version['version']);
\OC_Hook::emit('\OCP\Versions', 'delete', ['path' => $version['path'].'.v'.$version['version'], 'trigger' => self::DELETE_TRIGGER_QUOTA_EXCEEDED]);
$logger->info('running out of space! Delete oldest version: ' . $version['path'].'.v'.$version['version'], ['app' => 'files_versions']);
$versionsSize -= $version['size'];
$availableSpace += $version['size'];
next($allVersions);
$i++;
}
return $versionsSize; // finally return the new size of the version history
}
return false;
}
/**
* Create recursively missing directories inside of files_versions
* that match the given path to a file.
*
* @param string $filename $path to a file, relative to the user's
* "files" folder
* @param View $view view on data/user/
*/
public static function createMissingDirectories($filename, $view) {
$dirname = Filesystem::normalizePath(dirname($filename));
$dirParts = explode('/', $dirname);
$dir = "/files_versions";
foreach ($dirParts as $part) {
$dir = $dir . '/' . $part;
if (!$view->file_exists($dir)) {
$view->mkdir($dir);
}
}
}
/**
* Static workaround
* @return Expiration
*/
protected static function getExpiration() {
if (self::$application === null) {
self::$application = \OC::$server->get(Application::class);
}
return self::$application->getContainer()->get(Expiration::class);
}
}