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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:
// - finish porting to OC_FilesystemView to enable network transparency
// - 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=60; // 1 min
const DEFAULTMAXVERSIONS=50;
private $view;
function __construct( $view ) {
$this->view = $view;
}
/**
* 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<>'') $this->store($path);
}
}
/**
* store a new version of a file.
*/
public function store($filename) {
if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
$files_view = \OCP\Files::getStorage("files");
$users_view = \OCP\Files::getStorage("files_versions");
$users_view->chroot(\OCP\User::getUser().'/');
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').'/'. $uid .'/files';
Storage::init();
//check if source file already exist as version to avoid recursions.
if ($users_view->file_exists($filename)) {
return false;
}
// check if filename is a directory
if($files_view->is_dir($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($files_view->filesize($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
@$users_view->copy('files'.$filename, 'versions'.$filename.'.v'.time());
// expire old revisions if necessary
Storage::expire($filename);
}
}
/**
* rollback to an old version of a file.
*/
public static function rollback($filename,$revision) {
if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
$users_view = \OCP\Files::getStorage("files_versions");
$users_view->chroot(\OCP\User::getUser().'/');
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').'/'. $uid .'/files';
// rollback
if( @$users_view->copy('versions'.$filename.'.v'.$revision, 'files'.$filename) ) {
return true;
}else{
return false;
}
}
}
/**
* check if old versions of a file exist.
*/
public static function isversioned($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);
}
}
/**
* @brief get a list of all available versions of a file in descending chronological order
* @param $filename file to find versions of, relative to the user files dir
* @param $count number of versions to return
* @returns array
*/
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 );
$i = 0;
foreach( $matches as $ma ) {
$i++;
$versions[$i]['cur'] = 0;
$parts = explode( '.v', $ma );
$versions[$i]['version'] = ( end( $parts ) );
// if file with modified date exists, flag it in array as currently enabled version
$files_view = \OCP\Files::getStorage('files');
$local_file = $files_view->getLocalFile($filename);
( \md5_file( $ma ) == \md5_file( $local_file ) ? $versions[$i]['fileMatch'] = 1 : $versions[$i]['fileMatch'] = 0 );
}
$versions = array_reverse( $versions );
foreach( $versions as $key => $value ) {
// flag the first matched file in array (which will have latest modification date) as current version
if ( $versions[$key]['fileMatch'] ) {
$versions[$key]['cur'] = 1;
break;
}
}
$versions = array_reverse( $versions );
// only show the newest commits
if( $count != 0 and ( count( $versions )>$count ) ) {
$versions = array_slice( $versions, count( $versions ) - $count );
}
return( $versions );
} else {
// if versioning isn't enabled then return an empty array
return( array() );
}
}
/**
* @brief Erase a file's versions which exceed the set quota
*/
public static function expire($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 );
}
}
}
}
/**
* @brief Erase all old versions of all user files
* @return true/false
*/
public function expireAll() {
$dir = \OCP\Config::getSystemValue('files_versionsfolder', Storage::DEFAULTFOLDER);
return $this->view->deleteAll( $dir, true );
}
}
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