463 lines
15 KiB
PHP
463 lines
15 KiB
PHP
<?php
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/**
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* Copyright (c) 2012 Frank Karlitschek <frank@owncloud.org>
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* 2013 Bjoern Schiessle <schiessle@owncloud.com>
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* This file is licensed under the Affero General Public License version 3 or
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* later.
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* See the COPYING-README file.
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*/
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/**
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* Versions
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*
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* A class to handle the versioning of files.
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*/
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namespace OCA\Files_Versions;
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class Storage {
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const DEFAULTENABLED=true;
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const DEFAULTMAXSIZE=50; // unit: percentage; 50% of available disk space/quota
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private static $max_versions_per_interval = array(
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//first 10sec, one version every 2sec
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1 => array('intervalEndsAfter' => 10, 'step' => 2),
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//next minute, one version every 10sec
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2 => array('intervalEndsAfter' => 60, 'step' => 10),
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//next hour, one version every minute
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3 => array('intervalEndsAfter' => 3600, 'step' => 60),
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//next 24h, one version every hour
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4 => array('intervalEndsAfter' => 86400, 'step' => 3600),
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//next 30days, one version per day
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5 => array('intervalEndsAfter' => 2592000, 'step' => 86400),
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//until the end one version per week
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6 => array('intervalEndsAfter' => -1, 'step' => 604800),
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);
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public static function getUidAndFilename($filename) {
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$uid = \OC\Files\Filesystem::getOwner($filename);
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\OC\Files\Filesystem::initMountPoints($uid);
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if ( $uid != \OCP\User::getUser() ) {
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$info = \OC\Files\Filesystem::getFileInfo($filename);
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$ownerView = new \OC\Files\View('/'.$uid.'/files');
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$filename = $ownerView->getPath($info['fileid']);
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}
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return array($uid, $filename);
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}
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/**
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* get current size of all versions from a given user
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*
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* @param $user user who owns the versions
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* @return mixed versions size or false if no versions size is stored
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*/
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private static function getVersionsSize($user) {
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$query = \OC_DB::prepare('SELECT size FROM *PREFIX*files_versions WHERE user=?');
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$result = $query->execute(array($user))->fetchAll();
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if ($result) {
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return $result[0]['size'];
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}
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return false;
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}
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/**
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* write to the database how much space is in use for versions
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*
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* @param $user owner of the versions
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* @param $size size of the versions
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*/
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private static function setVersionsSize($user, $size) {
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if ( self::getVersionsSize($user) === false) {
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$query = \OC_DB::prepare('INSERT INTO *PREFIX*files_versions (size, user) VALUES (?, ?)');
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}else {
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$query = \OC_DB::prepare('UPDATE *PREFIX*files_versions SET size=? WHERE user=?');
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}
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$query->execute(array($size, $user));
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}
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/**
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* store a new version of a file.
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*/
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public static function store($filename) {
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if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
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list($uid, $filename) = self::getUidAndFilename($filename);
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$files_view = new \OC\Files\View('/'.$uid .'/files');
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$users_view = new \OC\Files\View('/'.$uid);
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$versions_view = new \OC\Files\View('/'.$uid.'/files_versions');
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// check if filename is a directory
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if($files_view->is_dir($filename)) {
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return false;
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}
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// we should have a source file to work with
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if (!$files_view->file_exists($filename)) {
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return false;
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}
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// create all parent folders
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$info=pathinfo($filename);
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$versionsFolderName=$versions_view->getLocalFolder('');
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if(!file_exists($versionsFolderName.'/'.$info['dirname'])) {
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mkdir($versionsFolderName.'/'.$info['dirname'], 0750, true);
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}
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// store a new version of a file
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$users_view->copy('files'.$filename, 'files_versions'.$filename.'.v'.$users_view->filemtime('files'.$filename));
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$versionsSize = self::getVersionsSize($uid);
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if ( $versionsSize === false || $versionsSize < 0 ) {
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$versionsSize = self::calculateSize($uid);
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}
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$versionsSize += $users_view->filesize('files'.$filename);
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// expire old revisions if necessary
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$newSize = self::expire($filename, $versionsSize);
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if ( $newSize != $versionsSize ) {
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self::setVersionsSize($uid, $newSize);
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}
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}
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}
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/**
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* Delete versions of a file
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*/
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public static function delete($filename) {
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list($uid, $filename) = self::getUidAndFilename($filename);
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$versions_fileview = new \OC\Files\View('/'.$uid .'/files_versions');
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$abs_path = $versions_fileview->getLocalFile($filename.'.v');
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if( ($versions = self::getVersions($uid, $filename)) ) {
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$versionsSize = self::getVersionsSize($uid);
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if ( $versionsSize === false || $versionsSize < 0 ) {
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$versionsSize = self::calculateSize($uid);
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}
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foreach ($versions as $v) {
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unlink($abs_path . $v['version']);
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$versionsSize -= $v['size'];
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}
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self::setVersionsSize($uid, $versionsSize);
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}
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}
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/**
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* rename versions of a file
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*/
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public static function rename($oldpath, $newpath) {
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list($uid, $oldpath) = self::getUidAndFilename($oldpath);
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list($uidn, $newpath) = self::getUidAndFilename($newpath);
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$versions_view = new \OC\Files\View('/'.$uid .'/files_versions');
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$files_view = new \OC\Files\View('/'.$uid .'/files');
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$abs_newpath = $versions_view->getLocalFile($newpath);
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if ( $files_view->is_dir($oldpath) && $versions_view->is_dir($oldpath) ) {
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$versions_view->rename($oldpath, $newpath);
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} else if ( ($versions = Storage::getVersions($uid, $oldpath)) ) {
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$info=pathinfo($abs_newpath);
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if(!file_exists($info['dirname'])) mkdir($info['dirname'], 0750, true);
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foreach ($versions as $v) {
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$versions_view->rename($oldpath.'.v'.$v['version'], $newpath.'.v'.$v['version']);
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}
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}
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}
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/**
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* rollback to an old version of a file.
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*/
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public static function rollback($filename, $revision) {
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if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
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list($uid, $filename) = self::getUidAndFilename($filename);
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$users_view = new \OC\Files\View('/'.$uid);
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$versionCreated = false;
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//first create a new version
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$version = 'files_versions'.$filename.'.v'.$users_view->filemtime('files'.$filename);
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if ( !$users_view->file_exists($version)) {
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$users_view->copy('files'.$filename, 'files_versions'.$filename.'.v'.$users_view->filemtime('files'.$filename));
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$versionCreated = true;
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}
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// rollback
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if( @$users_view->copy('files_versions'.$filename.'.v'.$revision, 'files'.$filename) ) {
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$users_view->touch('files'.$filename, $revision);
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Storage::expire($filename);
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return true;
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}else if ( $versionCreated ) {
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$users_view->unlink($version);
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}
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}
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return false;
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}
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/**
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* @brief get a list of all available versions of a file in descending chronological order
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* @param $uid user id from the owner of the file
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* @param $filename file to find versions of, relative to the user files dir
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* @param $count number of versions to return
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* @returns array
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*/
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public static function getVersions($uid, $filename, $count = 0 ) {
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if( \OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true' ) {
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$versions_fileview = new \OC\Files\View('/' . $uid . '/files_versions');
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$versionsName = $versions_fileview->getLocalFile($filename);
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$versions = array();
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// fetch for old versions
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$matches = glob(preg_quote($versionsName).'.v*' );
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if ( !$matches ) {
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return $versions;
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}
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sort( $matches );
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$files_view = new \OC\Files\View('/'.$uid.'/files');
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$local_file = $files_view->getLocalFile($filename);
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$local_file_md5 = \md5_file( $local_file );
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foreach( $matches as $ma ) {
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$parts = explode( '.v', $ma );
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$version = ( end( $parts ) );
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$key = $version.'#'.$filename;
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$versions[$key]['cur'] = 0;
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$versions[$key]['version'] = $version;
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$versions[$key]['path'] = $filename;
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$versions[$key]['size'] = $versions_fileview->filesize($filename.'.v'.$version);
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// if file with modified date exists, flag it in array as currently enabled version
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( \md5_file( $ma ) == $local_file_md5 ? $versions[$key]['fileMatch'] = 1 : $versions[$key]['fileMatch'] = 0 );
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}
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$versions = array_reverse( $versions );
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foreach( $versions as $key => $value ) {
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// flag the first matched file in array (which will have latest modification date) as current version
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if ( $value['fileMatch'] ) {
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$value['cur'] = 1;
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break;
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}
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}
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$versions = array_reverse( $versions );
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// only show the newest commits
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if( $count != 0 and ( count( $versions )>$count ) ) {
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$versions = array_slice( $versions, count( $versions ) - $count );
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}
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return( $versions );
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} else {
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// if versioning isn't enabled then return an empty array
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return( array() );
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}
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}
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/**
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* @brief get the size of all stored versions from a given user
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* @param $uid id from the user
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* @return size of vesions
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*/
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private static function calculateSize($uid) {
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if( \OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true' ) {
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$versions_fileview = new \OC\Files\View('/'.$uid.'/files_versions');
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$versionsRoot = $versions_fileview->getLocalFolder('');
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$iterator = new \RecursiveIteratorIterator(
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new \RecursiveDirectoryIterator($versionsRoot),
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\RecursiveIteratorIterator::CHILD_FIRST
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);
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$size = 0;
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foreach ($iterator as $path) {
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if ( preg_match('/^.+\.v(\d+)$/', $path, $match) ) {
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$relpath = substr($path, strlen($versionsRoot)-1);
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$size += $versions_fileview->filesize($relpath);
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}
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}
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return $size;
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}
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}
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/**
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* @brief returns all stored file versions from a given user
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* @param $uid id to the user
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* @return array with contains two arrays 'all' which contains all versions sorted by age and 'by_file' which contains all versions sorted by filename
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*/
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private static function getAllVersions($uid) {
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if( \OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true' ) {
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$versions_fileview = new \OC\Files\View('/'.$uid.'/files_versions');
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$versionsRoot = $versions_fileview->getLocalFolder('');
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$iterator = new \RecursiveIteratorIterator(
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new \RecursiveDirectoryIterator($versionsRoot),
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\RecursiveIteratorIterator::CHILD_FIRST
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);
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$versions = array();
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foreach ($iterator as $path) {
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if ( preg_match('/^.+\.v(\d+)$/', $path, $match) ) {
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$relpath = substr($path, strlen($versionsRoot)-1);
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$versions[$match[1].'#'.$relpath] = array('path' => $relpath, 'timestamp' => $match[1]);
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}
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}
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ksort($versions);
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$i = 0;
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$result = array();
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foreach( $versions as $key => $value ) {
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$i++;
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$size = $versions_fileview->filesize($value['path']);
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$filename = substr($value['path'], 0, -strlen($value['timestamp'])-2);
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$result['all'][$key]['version'] = $value['timestamp'];
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$result['all'][$key]['path'] = $filename;
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$result['all'][$key]['size'] = $size;
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$filename = substr($value['path'], 0, -strlen($value['timestamp'])-2);
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$result['by_file'][$filename][$key]['version'] = $value['timestamp'];
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$result['by_file'][$filename][$key]['path'] = $filename;
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$result['by_file'][$filename][$key]['size'] = $size;
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}
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return $result;
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}
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}
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/**
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* @brief Erase a file's versions which exceed the set quota
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*/
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private static function expire($filename, $versionsSize = null) {
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if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
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list($uid, $filename) = self::getUidAndFilename($filename);
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$versions_fileview = new \OC\Files\View('/'.$uid.'/files_versions');
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// get available disk space for user
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$quota = \OC_Preferences::getValue($uid, 'files', 'quota');
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if ( $quota === null || $quota === 'default') {
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$quota = \OC_Appconfig::getValue('files', 'default_quota');
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}
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if ( $quota === null || $quota === 'none' ) {
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$quota = \OC\Files\Filesystem::free_space('/') / count(\OCP\User::getUsers());
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} else {
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$quota = \OCP\Util::computerFileSize($quota);
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}
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// make sure that we have the current size of the version history
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if ( $versionsSize === null ) {
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$versionsSize = self::getVersionsSize($uid);
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if ( $versionsSize === false || $versionsSize < 0 ) {
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$versionsSize = self::calculateSize($uid);
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}
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}
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// calculate available space for version history
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$files_view = new \OC\Files\View('/'.$uid.'/files');
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$rootInfo = $files_view->getFileInfo('/');
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$free = $quota-$rootInfo['size']; // remaining free space for user
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if ( $free > 0 ) {
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$availableSpace = ($free * self::DEFAULTMAXSIZE / 100) - $versionsSize; // how much space can be used for versions
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} else {
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$availableSpace = $free-$versionsSize;
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}
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// after every 1000s run reduce the number of all versions not only for the current file
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$random = rand(0, 1000);
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if ($random == 0) {
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$result = Storage::getAllVersions($uid);
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$versions_by_file = $result['by_file'];
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$all_versions = $result['all'];
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} else {
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$all_versions = Storage::getVersions($uid, $filename);
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$versions_by_file[$filename] = $all_versions;
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}
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$time = time();
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// it is possible to expire versions from more than one file
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// iterate through all given files
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foreach ($versions_by_file as $filename => $versions) {
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$versions = array_reverse($versions); // newest version first
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$interval = 1;
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$step = Storage::$max_versions_per_interval[$interval]['step'];
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if (Storage::$max_versions_per_interval[$interval]['intervalEndsAfter'] == -1) {
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$nextInterval = -1;
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} else {
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$nextInterval = $time - Storage::$max_versions_per_interval[$interval]['intervalEndsAfter'];
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}
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$firstVersion = reset($versions);
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$firstKey = key($versions);
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$prevTimestamp = $firstVersion['version'];
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$nextVersion = $firstVersion['version'] - $step;
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$remaining_versions[$firstKey] = $firstVersion;
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unset($versions[$firstKey]);
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foreach ($versions as $key => $version) {
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$newInterval = true;
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while ( $newInterval ) {
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if ( $nextInterval == -1 || $version['version'] >= $nextInterval ) {
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if ( $version['version'] > $nextVersion ) {
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//distance between two version too small, delete version
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$versions_fileview->unlink($version['path'].'.v'.$version['version']);
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$availableSpace += $version['size'];
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$versionsSize -= $version['size'];
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unset($all_versions[$key]); // update array with all versions
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} else {
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$nextVersion = $version['version'] - $step;
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}
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$newInterval = false; // version checked so we can move to the next one
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} else { // time to move on to the next interval
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$interval++;
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$step = Storage::$max_versions_per_interval[$interval]['step'];
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$nextVersion = $prevTimestamp - $step;
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if ( Storage::$max_versions_per_interval[$interval]['intervalEndsAfter'] == -1 ) {
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$nextInterval = -1;
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} else {
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$nextInterval = $time - Storage::$max_versions_per_interval[$interval]['intervalEndsAfter'];
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}
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$newInterval = true; // we changed the interval -> check same version with new interval
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}
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}
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$prevTimestamp = $version['version'];
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}
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}
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// Check if enough space is available after versions are rearranged.
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// If not we delete the oldest versions until we meet the size limit for versions,
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// but always keep the two latest versions
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$numOfVersions = count($all_versions) -2 ;
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$i = 0;
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while ($availableSpace < 0 && $i < $numOfVersions) {
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$versions_fileview->unlink($all_versions[$i]['path'].'.v'.$all_versions[$i]['version']);
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$versionsSize -= $all_versions[$i]['size'];
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$availableSpace += $all_versions[$i]['size'];
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$i++;
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}
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return $versionsSize; // finally return the new size of the version history
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}
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return false;
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}
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}
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