nextcloud/apps/files_versions/versions.php

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<?php
/**
* Copyright (c) 2012 Frank Karlitschek <frank@owncloud.org>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
/**
* Versions
*
* A class to handle the versioning of files.
*/
namespace OCA_Versions;
class Storage {
// config.php configuration:
// - files_versions
// - files_versionsfolder
// - files_versionsblacklist
// - files_versionsmaxfilesize
// - files_versionsinterval
// - files_versionmaxversions
//
// todo:
// - port to oc_filesystem to enable network transparency
// - check if it works well together with encryption
// - implement expire all function. And find a place to call it ;-)
// - add transparent compression. first test if it´s worth it.
const DEFAULTENABLED=true;
const DEFAULTFOLDER='versions';
const DEFAULTBLACKLIST='avi mp3 mpg mp4 ctmp';
const DEFAULTMAXFILESIZE=1048576; // 10MB
const DEFAULTMININTERVAL=120; // 2 min
const DEFAULTMAXVERSIONS=50;
/**
* init the versioning and create the versions folder.
*/
public static function init() {
if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
// create versions folder
$foldername=\OCP\Config::getSystemValue('datadirectory').'/'. \OCP\USER::getUser() .'/'.\OCP\Config::getSystemValue('files_versionsfolder', Storage::DEFAULTFOLDER);
if(!is_dir($foldername)){
mkdir($foldername);
}
}
}
/**
* listen to write event.
*/
public static function write_hook($params) {
if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
$path = $params[\OC_Filesystem::signal_param_path];
if($path<>'') Storage::store($path);
}
}
/**
* store a new version of a file.
*/
public static function store($filename) {
if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
if (\OCP\App::isEnabled('files_sharing') && $source = \OC_Share::getSource('/'.\OCP\User::getUser().'/files'.$filename)) {
$pos = strpos($source, '/files', 1);
$uid = substr($source, 1, $pos - 1);
$filename = substr($source, $pos + 6);
} else {
$uid = \OCP\User::getUser();
}
$versionsfoldername=\OCP\Config::getSystemValue('datadirectory').'/'. $uid .'/'.\OCP\Config::getSystemValue('files_versionsfolder', Storage::DEFAULTFOLDER);
$filesfoldername=\OCP\Config::getSystemValue('datadirectory').'/'. $uid .'/files';
Storage::init();
// check if filename is a directory
if(is_dir($filesfoldername.$filename)){
return false;
}
// check filetype blacklist
$blacklist=explode(' ',\OCP\Config::getSystemValue('files_versionsblacklist', Storage::DEFAULTBLACKLIST));
foreach($blacklist as $bl) {
$parts=explode('.', $filename);
$ext=end($parts);
if(strtolower($ext)==$bl) {
return false;
}
}
// check filesize
if(filesize($filesfoldername.'/'.$filename)>\OCP\Config::getSystemValue('files_versionsmaxfilesize', Storage::DEFAULTMAXFILESIZE)){
return false;
}
// check mininterval if the file is being modified by the owner (all shared files should be versioned despite mininterval)
if ($uid == \OCP\User::getUser()) {
$matches=glob($versionsfoldername.'/'.$filename.'.v*');
sort($matches);
$parts=explode('.v',end($matches));
if((end($parts)+Storage::DEFAULTMININTERVAL)>time()){
return false;
}
}
// create all parent folders
$info=pathinfo($filename);
if(!file_exists($versionsfoldername.'/'.$info['dirname'])) mkdir($versionsfoldername.'/'.$info['dirname'],0700,true);
// store a new version of a file
copy($filesfoldername.'/'.$filename,$versionsfoldername.'/'.$filename.'.v'.time());
// expire old revisions
Storage::expire($filename);
}
}
/**
* rollback to an old version of a file.
*/
public static function rollback($filename,$revision) {
if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
if (\OCP\App::isEnabled('files_sharing') && $source = \OC_Share::getSource('/'.\OCP\User::getUser().'/files'.$filename)) {
$pos = strpos($source, '/files', 1);
$uid = substr($source, 1, $pos - 1);
$filename = substr($source, $pos + 6);
} else {
$uid = \OCP\User::getUser();
}
$versionsfoldername=\OCP\Config::getSystemValue('datadirectory').'/'.$uid .'/'.\OCP\Config::getSystemValue('files_versionsfolder', Storage::DEFAULTFOLDER);
$filesfoldername=\OCP\Config::getSystemValue('datadirectory').'/'. $uid .'/files';
// rollback
if ( @copy($versionsfoldername.'/'.$filename.'.v'.$revision,$filesfoldername.$filename) ) {
return true;
}else{
return false;
}
}
}
/**
* check if old versions of a file exist.
*/
public static function isversioned($filename) {
if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
if (\OCP\App::isEnabled('files_sharing') && $source = \OC_Share::getSource('/'.\OCP\User::getUser().'/files'.$filename)) {
$pos = strpos($source, '/files', 1);
$uid = substr($source, 1, $pos - 1);
$filename = substr($source, $pos + 6);
} else {
$uid = \OCP\User::getUser();
}
$versionsfoldername=\OCP\Config::getSystemValue('datadirectory').'/'. $uid .'/'.\OCP\Config::getSystemValue('files_versionsfolder', Storage::DEFAULTFOLDER);
// check for old versions
$matches=glob($versionsfoldername.'/'.$filename.'.v*');
if(count($matches)>1){
return true;
}else{
return false;
}
}else{
return(false);
}
}
/**
* get a list of old versions of a file.
*/
public static function getversions($filename,$count=0) {
if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
if (\OCP\App::isEnabled('files_sharing') && $source = \OC_Share::getSource('/'.\OCP\User::getUser().'/files'.$filename)) {
$pos = strpos($source, '/files', 1);
$uid = substr($source, 1, $pos - 1);
$filename = substr($source, $pos + 6);
} else {
$uid = \OCP\User::getUser();
}
$versionsfoldername=\OCP\Config::getSystemValue('datadirectory').'/'. $uid .'/'.\OCP\Config::getSystemValue('files_versionsfolder', Storage::DEFAULTFOLDER);
$versions=array();
// fetch for old versions
$matches=glob($versionsfoldername.'/'.$filename.'.v*');
sort($matches);
foreach($matches as $ma) {
$parts=explode('.v',$ma);
$versions[]=(end($parts));
}
// only show the newest commits
if($count<>0 and (count($versions)>$count)) {
$versions=array_slice($versions,count($versions)-$count);
}
return($versions);
}else{
return(array());
}
}
/**
* expire old versions of a file.
*/
public static function expire($filename) {
if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
if (\OCP\App::isEnabled('files_sharing') && $source = \OC_Share::getSource('/'.\OCP\User::getUser().'/files'.$filename)) {
$pos = strpos($source, '/files', 1);
$uid = substr($source, 1, $pos - 1);
$filename = substr($source, $pos + 6);
} else {
$uid = \OCP\User::getUser();
}
$versionsfoldername=\OCP\Config::getSystemValue('datadirectory').'/'. $uid .'/'.\OCP\Config::getSystemValue('files_versionsfolder', Storage::DEFAULTFOLDER);
// check for old versions
$matches=glob($versionsfoldername.'/'.$filename.'.v*');
if(count($matches)>\OCP\Config::getSystemValue('files_versionmaxversions', Storage::DEFAULTMAXVERSIONS)){
$numbertodelete=count($matches-\OCP\Config::getSystemValue('files_versionmaxversions', Storage::DEFAULTMAXVERSIONS));
// delete old versions of a file
$deleteitems=array_slice($matches,0,$numbertodelete);
foreach($deleteitems as $de){
unlink($versionsfoldername.'/'.$filename.'.v'.$de);
}
}
}
}
/**
* expire all old versions.
*/
public static function expireall($filename) {
// todo this should go through all the versions directories and delete all the not needed files and not needed directories.
// useful to be included in a cleanup cronjob.
}
}