nextcloud/apps/files_versions/lib/storage.php

754 lines
25 KiB
PHP

<?php
/**
* @author Bart Visscher <bartv@thisnet.nl>
* @author Björn Schießle <schiessle@owncloud.com>
* @author Felix Moeller <mail@felixmoeller.de>
* @author Florin Peter <github@florin-peter.de>
* @author Georg Ehrke <georg@owncloud.com>
* @author Joas Schilling <nickvergessen@owncloud.com>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Lukas Reschke <lukas@owncloud.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <icewind@owncloud.com>
* @author Robin McCorkell <rmccorkell@karoshi.org.uk>
* @author Scrutinizer Auto-Fixer <auto-fixer@scrutinizer-ci.com>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Vincent Petry <pvince81@owncloud.com>
*
* @copyright Copyright (c) 2015, ownCloud, Inc.
* @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/>
*
*/
/**
* Versions
*
* A class to handle the versioning of files.
*/
namespace OCA\Files_Versions;
use OCA\Files_Versions\AppInfo\Application;
use OCA\Files_Versions\Command\Expire;
class Storage {
const DEFAULTENABLED=true;
const DEFAULTMAXSIZE=50; // unit: percentage; 50% of available disk space/quota
const VERSIONS_ROOT = 'files_versions/';
// files for which we can remove the versions after the delete operation was successful
private static $deletedFiles = array();
private static $sourcePathAndUser = array();
private static $max_versions_per_interval = array(
//first 10sec, one version every 2sec
1 => array('intervalEndsAfter' => 10, 'step' => 2),
//next minute, one version every 10sec
2 => array('intervalEndsAfter' => 60, 'step' => 10),
//next hour, one version every minute
3 => array('intervalEndsAfter' => 3600, 'step' => 60),
//next 24h, one version every hour
4 => array('intervalEndsAfter' => 86400, 'step' => 3600),
//next 30days, one version per day
5 => array('intervalEndsAfter' => 2592000, 'step' => 86400),
//until the end one version per week
6 => array('intervalEndsAfter' => -1, 'step' => 604800),
);
/** @var \OCA\Files_Versions\AppInfo\Application */
private static $application;
public static function getUidAndFilename($filename) {
$uid = \OC\Files\Filesystem::getOwner($filename);
\OC\Files\Filesystem::initMountPoints($uid);
if ( $uid != \OCP\User::getUser() ) {
$info = \OC\Files\Filesystem::getFileInfo($filename);
$ownerView = new \OC\Files\View('/'.$uid.'/files');
$filename = $ownerView->getPath($info['fileid']);
}
return array($uid, $filename);
}
/**
* Remember the owner and the owner path of the source file
*
* @param string $source source path
*/
public static function setSourcePathAndUser($source) {
list($uid, $path) = self::getUidAndFilename($source);
self::$sourcePathAndUser[$source] = array('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 = $path = false;
}
return array($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 \OC\Files\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(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
// 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, strlen($filename)-5);
}
list($uid, $filename) = self::getUidAndFilename($filename);
$files_view = new \OC\Files\View('/'.$uid .'/files');
$users_view = new \OC\Files\View('/'.$uid);
// check if filename is a directory
if($files_view->is_dir($filename)) {
return false;
}
// we should have a source file to work with, and the file shouldn't
// be empty
$fileExists = $files_view->file_exists($filename);
if (!($fileExists && $files_view->filesize($filename) > 0)) {
return false;
}
// create all parent folders
self::createMissingDirectories($filename, $users_view);
$versionsSize = self::getVersionsSize($uid);
// assumption: we need filesize($filename) for the new version +
// some more free space for the modified file which might be
// 1.5 times as large as the current version -> 2.5
$neededSpace = $files_view->filesize($filename) * 2.5;
self::scheduleExpire($uid, $filename, $versionsSize, $neededSpace);
// store a new version of a file
$mtime = $users_view->filemtime('files/' . $filename);
$users_view->copy('files/' . $filename, 'files_versions/' . $filename . '.v' . $mtime);
// call getFileInfo to enforce a file cache entry for the new version
$users_view->getFileInfo('files_versions/' . $filename . '.v' . $mtime);
}
}
/**
* mark file as deleted so that we can remove the versions if the file is gone
* @param string $path
*/
public static function markDeletedFile($path) {
list($uid, $filename) = self::getUidAndFilename($path);
self::$deletedFiles[$path] = array(
'uid' => $uid,
'filename' => $filename);
}
/**
* delete the version from the storage and cache
*
* @param \OC\Files\View $view
* @param string $path
*/
protected static function deleteVersion($view, $path) {
$view->unlink($path);
/**
* @var \OC\Files\Storage\Storage $storage
* @var string $internalPath
*/
list($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 = $deletedFile['filename'];
if (!\OC\Files\Filesystem::file_exists($path)) {
$view = new \OC\Files\View('/' . $uid . '/files_versions');
$versions = self::getVersions($uid, $filename);
if (!empty($versions)) {
foreach ($versions as $v) {
\OC_Hook::emit('\OCP\Versions', 'preDelete', array('path' => $path . $v['version']));
self::deleteVersion($view, $filename . '.v' . $v['version']);
\OC_Hook::emit('\OCP\Versions', 'delete', array('path' => $path . $v['version']));
}
}
}
unset(self::$deletedFiles[$path]);
}
/**
* 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, $operation) {
list($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 ($sourcePath === false) {
return true;
}
list($targetOwner, $targetPath) = self::getUidAndFilename($targetPath);
$sourcePath = ltrim($sourcePath, '/');
$targetPath = ltrim($targetPath, '/');
$rootView = new \OC\Files\View('');
// did we move a directory ?
if ($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 \OC\Files\View('/'. $targetOwner));
// move the directory containing the versions
$rootView->$operation(
'/' . $sourceOwner . '/files_versions/' . $sourcePath,
'/' . $targetOwner . '/files_versions/' . $targetPath
);
}
} else if ($versions = Storage::getVersions($sourceOwner, '/' . $sourcePath)) {
// create missing dirs if necessary
self::createMissingDirectories($targetPath, new \OC\Files\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 $revision revision timestamp
*/
public static function rollback($file, $revision) {
if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
// add expected leading slash
$file = '/' . ltrim($file, '/');
list($uid, $filename) = self::getUidAndFilename($file);
$users_view = new \OC\Files\View('/'.$uid);
$files_view = new \OC\Files\View('/'.\OCP\User::getUser().'/files');
$versionCreated = 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));
$versionCreated = true;
}
// rollback
if (self::copyFileContents($users_view, 'files_versions' . $filename . '.v' . $revision, 'files' . $filename)) {
$files_view->touch($file, $revision);
Storage::scheduleExpire($uid, $file);
return true;
} else if ($versionCreated) {
self::deleteVersion($users_view, $version);
}
}
return false;
}
/**
* Stream copy file contents from $path1 to $path2
*
* @param \OC\Files\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, $path2) {
list($storage1, $internalPath1) = $view->resolvePath($path1);
list($storage2, $internalPath2) = $view->resolvePath($path2);
$result = $storage2->moveFromStorage($storage1, $internalPath1, $internalPath2);
return ($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 = '') {
$versions = array();
if (empty($filename)) {
return $versions;
}
// fetch for old versions
$view = new \OC\Files\View('/' . $uid . '/');
$pathinfo = pathinfo($filename);
$versionedFile = $pathinfo['basename'];
$dir = \OC\Files\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 (!\OC\Files\Filesystem::isIgnoredDir($entryName)) {
$pathparts = pathinfo($entryName);
$filename = $pathparts['filename'];
if ($filename === $versionedFile) {
$pathparts = pathinfo($entryName);
$timestamp = substr($pathparts['extension'], 1);
$filename = $pathparts['filename'];
$key = $timestamp . '#' . $filename;
$versions[$key]['version'] = $timestamp;
$versions[$key]['humanReadableTimestamp'] = self::getHumanReadableTimestamp($timestamp);
if (empty($userFullPath)) {
$versions[$key]['preview'] = '';
} else {
$versions[$key]['preview'] = \OCP\Util::linkToRoute('core_ajax_versions_preview', array('file' => $userFullPath, 'version' => $timestamp));
}
$versions[$key]['path'] = \OC\Files\Filesystem::normalizePath($pathinfo['dirname'] . '/' . $filename);
$versions[$key]['name'] = $versionedFile;
$versions[$key]['size'] = $view->filesize($dir . '/' . $entryName);
}
}
}
closedir($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){
$expiration = self::getExpiration();
$threshold = $expiration->getMaxAgeAsTimestamp();
$versions = self::getAllVersions($uid);
if (!$threshold || !array_key_exists('all', $versions)) {
return;
}
$toDelete = [];
foreach (array_reverse($versions['all']) as $key => $version) {
if (intval($version['version'])<$threshold) {
$toDelete[$key] = $version;
} else {
//Versions are sorted by time - nothing mo to iterate.
break;
}
}
$view = new \OC\Files\View('/' . $uid . '/files_versions');
if (!empty($toDelete)) {
foreach ($toDelete as $version) {
\OC_Hook::emit('\OCP\Versions', 'preDelete', array('path' => $version['path'].'.v'.$version['version']));
self::deleteVersion($view, $version['path'] . '.v' . $version['version']);
\OC_Hook::emit('\OCP\Versions', 'delete', array('path' => $version['path'].'.v'.$version['version']));
}
}
}
/**
* translate a timestamp into a string like "5 days ago"
* @param int $timestamp
* @return string for example "5 days ago"
*/
private static function getHumanReadableTimestamp($timestamp) {
$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 \OC\Files\View('/' . $uid . '/');
$dirs = array(self::VERSIONS_ROOT);
$versions = array();
while (!empty($dirs)) {
$dir = array_pop($dirs);
$files = $view->getDirectoryContent($dir);
foreach ($files as $file) {
if ($file['type'] === 'dir') {
array_push($dirs, $file['path']);
} else {
$versionsBegin = strrpos($file['path'], '.v');
$relPathStart = strlen(self::VERSIONS_ROOT);
$version = substr($file['path'], $versionsBegin + 2);
$relpath = substr($file['path'], $relPathStart, $versionsBegin - $relPathStart);
$key = $version . '#' . $relpath;
$versions[$key] = array('path' => $relpath, 'timestamp' => $version);
}
}
}
// newest version first
krsort($versions);
$result = array();
foreach ($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()) {
list($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 = array(); // 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);
$firstKey = key($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'];
\OCP\Util::writeLog('files_versions', 'Mark to expire '. $version['path'] .' next version should be ' . $nextVersion . " or smaller. (prevTimestamp: " . $prevTimestamp . "; step: " . $step, \OCP\Util::DEBUG);
} 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'];
}
$newInterval = true; // we changed the interval -> check same version with new interval
}
}
}
return array($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
* @param int|null $versionsSize current versions size
* @param int $neededSpace requested versions size
*/
private static function scheduleExpire($uid, $fileName, $versionsSize = null, $neededSpace = 0) {
// let the admin disable auto expire
$expiration = self::getExpiration();
if ($expiration->isEnabled()) {
$command = new Expire($uid, $fileName, $versionsSize, $neededSpace);
\OC::$server->getCommandBus()->push($command);
}
}
/**
* Expire versions which exceed the quota
*
* @param $filename
* @param int|null $versionsSize
* @param int $offset
* @return bool|int|null
*/
public static function expire($filename, $versionsSize = null, $offset = 0) {
$config = \OC::$server->getConfig();
$expiration = self::getExpiration();
if($config->getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true' && $expiration->isEnabled()) {
list($uid, $filename) = self::getUidAndFilename($filename);
if (empty($filename)) {
// file maybe renamed or deleted
return false;
}
$versionsFileview = new \OC\Files\View('/'.$uid.'/files_versions');
// get available disk space for user
$softQuota = true;
$quota = $config->getUserValue($uid, 'files', 'quota', null);
if ( $quota === null || $quota === 'default') {
$quota = $config->getAppValue('files', 'default_quota', null);
}
if ( $quota === null || $quota === 'none' ) {
$quota = \OC\Files\Filesystem::free_space('/');
$softQuota = false;
} else {
$quota = \OCP\Util::computerFileSize($quota);
}
// make sure that we have the current size of the version history
if ( $versionsSize === null ) {
$versionsSize = self::getVersionsSize($uid);
}
// calculate available space for version history
// subtract size of files and current versions size from quota
if ($softQuota) {
$files_view = new \OC\Files\View('/'.$uid.'/files');
$rootInfo = $files_view->getFileInfo('/', false);
$free = $quota-$rootInfo['size']; // remaining free space for user
if ( $free > 0 ) {
$availableSpace = ($free * self::DEFAULTMAXSIZE / 100) - ($versionsSize + $offset); // how much space can be used for versions
} else {
$availableSpace = $free - $versionsSize - $offset;
}
} else {
$availableSpace = $quota - $offset;
}
$allVersions = Storage::getVersions($uid, $filename);
$time = time();
list($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) {
$result = Storage::getAllVersions($uid);
$allVersions = $result['all'];
foreach ($result['by_file'] as $versions) {
list($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', array('path' => $path));
self::deleteVersion($versionsFileview, $path);
\OC_Hook::emit('\OCP\Versions', 'delete', array('path' => $path));
unset($allVersions[$key]); // update array with the versions we keep
\OCP\Util::writeLog('files_versions', "Expire: " . $path, \OCP\Util::DEBUG);
}
// 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', array('path' => $version['path'].'.v'.$version['version']));
self::deleteVersion($versionsFileview, $version['path'] . '.v' . $version['version']);
\OC_Hook::emit('\OCP\Versions', 'delete', array('path' => $version['path'].'.v'.$version['version']));
\OCP\Util::writeLog('files_versions', 'running out of space! Delete oldest version: ' . $version['path'].'.v'.$version['version'] , \OCP\Util::DEBUG);
$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 \OC\Files\View $view view on data/user/
*/
private static function createMissingDirectories($filename, $view) {
$dirname = \OC\Files\Filesystem::normalizePath(dirname($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 (is_null(self::$application)) {
self::$application = new Application();
}
return self::$application->getContainer()->query('Expiration');
}
}