nextcloud/apps/files_versions/history.php

<?php

/**
 * ownCloud - History page of the Versions App
 *
 * @author Frank Karlitschek
 * @copyright 2012 Frank Karlitschek frank@owncloud.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library 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 Lesser General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

OCP\User::checkLoggedIn( );
OCP\Util::addStyle('files_versions', 'versions');
$tmpl = new OCP\Template( 'files_versions', 'history', 'user' );

if ( isset( $_GET['path'] ) ) {

	$path = $_GET['path'];
	$path = $path;
	$tmpl->assign( 'path', $path );
	$versions = new OCA_Versions\Storage();

	// roll back to old version if button clicked
        if( isset( $_GET['revert'] ) ) {

		if( $versions->rollback( $path, $_GET['revert'] ) ) {

			$tmpl->assign( 'outcome_stat', 'success' );

			$tmpl->assign( 'outcome_msg', "File {$_GET['path']} was reverted to version ".OCP\Util::formatDate( doubleval($_GET['revert']) ) );

		} else {

			$tmpl->assign( 'outcome_stat', 'failure' );

			$tmpl->assign( 'outcome_msg', "File {$_GET['path']} could not be reverted to version ".OCP\Util::formatDate( doubleval($_GET['revert']) ) );

		}

	}

	// show the history only if there is something to show
        if( OCA_Versions\Storage::isversioned( $path ) ) {

		$count = 999; //show the newest revisions
	        $versions = OCA_Versions\Storage::getVersions( $path, $count);

		$tmpl->assign( 'versions', array_reverse( $versions ) );

	}else{

		$tmpl->assign( 'message', 'No old versions available' );

	}
}else{

	$tmpl->assign( 'message', 'No path specified' );

}

$tmpl->printPage( );