279 lines
7.7 KiB
PHP
279 lines
7.7 KiB
PHP
<?php
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/**
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* Copyright (c) 2012 Frank Karlitschek <frank@owncloud.org>
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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_Versions;
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class Storage {
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// config.php configuration:
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// - files_versions
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// - files_versionsfolder
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// - files_versionsblacklist
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// - files_versionsmaxfilesize
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// - files_versionsinterval
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// - files_versionmaxversions
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//
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// todo:
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// - finish porting to OC_FilesystemView to enable network transparency
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// - add transparent compression. first test if it´s worth it.
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const DEFAULTENABLED=true;
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const DEFAULTBLACKLIST='avi mp3 mpg mp4 ctmp';
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const DEFAULTMAXFILESIZE=1048576; // 10MB
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const DEFAULTMININTERVAL=60; // 1 min
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const DEFAULTMAXVERSIONS=50;
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private static function getUidAndFilename($filename)
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{
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if (\OCP\App::isEnabled('files_sharing')
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&& substr($filename, 0, 7) == '/Shared'
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&& $source = \OCP\Share::getItemSharedWith('file',
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substr($filename, 7),
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\OC_Share_Backend_File::FORMAT_SHARED_STORAGE)) {
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$filename = $source['path'];
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$pos = strpos($filename, '/files', 1);
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$uid = substr($filename, 1, $pos - 1);
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$filename = substr($filename, $pos + 6);
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} else {
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$uid = \OCP\User::getUser();
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}
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return array($uid, $filename);
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}
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/**
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* store a new version of a file.
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*/
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public function store($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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$files_view = new \OC_FilesystemView('/'.$uid .'/files');
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$users_view = new \OC_FilesystemView('/'.$uid);
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//check if source file already exist as version to avoid recursions.
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// todo does this check work?
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if ($users_view->file_exists($filename)) {
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return false;
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}
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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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// check filetype blacklist
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$blacklist=explode(' ', \OCP\Config::getSystemValue('files_versionsblacklist', Storage::DEFAULTBLACKLIST));
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foreach($blacklist as $bl) {
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$parts=explode('.', $filename);
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$ext=end($parts);
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if(strtolower($ext)==$bl) {
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return false;
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}
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}
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// we should have a source file to work with
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if (!$files_view->file_exists($filename)) {
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return false;
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}
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// check filesize
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if($files_view->filesize($filename)>\OCP\Config::getSystemValue('files_versionsmaxfilesize', Storage::DEFAULTMAXFILESIZE)) {
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return false;
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}
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// check mininterval if the file is being modified by the owner (all shared files should be versioned despite mininterval)
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if ($uid == \OCP\User::getUser()) {
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$versions_fileview = new \OC_FilesystemView('/'.$uid.'/files_versions');
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$versionsName=\OCP\Config::getSystemValue('datadirectory').$versions_fileview->getAbsolutePath($filename);
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$versionsFolderName=\OCP\Config::getSystemValue('datadirectory').$versions_fileview->getAbsolutePath('');
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$matches=glob($versionsName.'.v*');
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sort($matches);
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$parts=explode('.v', end($matches));
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if((end($parts)+Storage::DEFAULTMININTERVAL)>time()) {
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return false;
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}
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}
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// create all parent folders
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$info=pathinfo($filename);
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if(!file_exists($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'.time());
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// expire old revisions if necessary
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Storage::expire($filename);
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}
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}
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/**
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* rollback to an old version of a file.
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*/
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public static function rollback($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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$users_view = new \OC_FilesystemView('/'.$uid);
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// rollback
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if( @$users_view->copy('files_versions'.$filename.'.v'.$revision, 'files'.$filename) ) {
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return true;
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}else{
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return false;
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}
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}
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}
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/**
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* check if old versions of a file exist.
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*/
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public static function isversioned($filename) {
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if(\OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true') {
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list($uid, $filename) = self::getUidAndFilename($filename);
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$versions_fileview = new \OC_FilesystemView('/'.$uid.'/files_versions');
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$versionsName=\OCP\Config::getSystemValue('datadirectory').$versions_fileview->getAbsolutePath($filename);
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// check for old versions
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$matches=glob($versionsName.'.v*');
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if(count($matches)>0) {
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return true;
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}else{
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return false;
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}
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}else{
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return(false);
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}
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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 $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( $filename, $count = 0 ) {
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if( \OCP\Config::getSystemValue('files_versions', Storage::DEFAULTENABLED)=='true' ) {
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list($uid, $filename) = self::getUidAndFilename($filename);
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$versions_fileview = new \OC_FilesystemView('/'.$uid.'/files_versions');
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$versionsName = \OCP\Config::getSystemValue('datadirectory').$versions_fileview->getAbsolutePath($filename);
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$versions = array();
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// fetch for old versions
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$matches = glob( $versionsName.'.v*' );
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sort( $matches );
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$i = 0;
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$files_view = new \OC_FilesystemView('/'.\OCP\User::getUser().'/files');
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$local_file = $files_view->getLocalFile($filename);
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foreach( $matches as $ma ) {
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$i++;
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$versions[$i]['cur'] = 0;
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$parts = explode( '.v', $ma );
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$versions[$i]['version'] = ( end( $parts ) );
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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 ) == \md5_file( $local_file ) ? $versions[$i]['fileMatch'] = 1 : $versions[$i]['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( $versions );
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} else {
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// if versioning isn't enabled then return an empty array
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return( array() );
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}
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}
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/**
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* @brief Erase a file's versions which exceed the set quota
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*/
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public static function expire($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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$versions_fileview = new \OC_FilesystemView('/'.$uid.'/files_versions');
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$versionsName=\OCP\Config::getSystemValue('datadirectory').$versions_fileview->getAbsolutePath($filename);
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// check for old versions
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$matches = glob( $versionsName.'.v*' );
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if( count( $matches ) > \OCP\Config::getSystemValue( 'files_versionmaxversions', Storage::DEFAULTMAXVERSIONS ) ) {
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$numberToDelete = count($matches) - \OCP\Config::getSystemValue( 'files_versionmaxversions', Storage::DEFAULTMAXVERSIONS );
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// delete old versions of a file
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$deleteItems = array_slice( $matches, 0, $numberToDelete );
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foreach( $deleteItems as $de ) {
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unlink( $versionsName.'.v'.$de );
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}
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}
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}
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}
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/**
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* @brief Erase all old versions of all user files
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* @return true/false
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*/
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public function expireAll() {
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$view = \OCP\Files::getStorage('files_versions');
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return $view->deleteAll('', true);
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}
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}
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