nextcloud/apps/files_texteditor/ajax/savefile.php

<?php
/**
 * ownCloud - files_texteditor
 *
 * @author Tom Needham
 * @copyright 2011 Tom Needham contact@tomneedham.com
 *
 * 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 Affero General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

// Init owncloud
 


// Check if we are a user
OCP\JSON::checkLoggedIn();

// Get paramteres
$filecontents = isset($_POST['filecontents']) ? $_POST['filecontents'] : false;
$path = isset($_POST['path']) ? $_POST['path'] : '';
$mtime = isset($_POST['mtime']) ? $_POST['mtime'] : '';

if($path != '' && $mtime != '' && $filecontents)
{
	// Get file mtime
	$filemtime = OC_Filesystem::filemtime($path);
	if($mtime != $filemtime)
	{
		// Then the file has changed since opening
		OCP\JSON::error();
		OCP\Util::writeLog('files_texteditor',"File: ".$path." modified since opening.",OCP\Util::ERROR);	
	}
	else
	{
		// File same as when opened
		// Save file
		if(OC_Filesystem::is_writable($path))
		{
			OC_Filesystem::file_put_contents($path, $filecontents);
			// Clear statcache
			clearstatcache();
			// Get new mtime
			$newmtime = OC_Filesystem::filemtime($path);
			OCP\JSON::success(array('data' => array('mtime' => $newmtime)));
		}
		else
		{
			// Not writeable!
			OCP\JSON::error(array('data' => array( 'message' => 'Insufficient permissions')));	
			OCP\Util::writeLog('files_texteditor',"User does not have permission to write to file: ".$path,OCP\Util::ERROR);
		}
	}
} else if($path == ''){
	OCP\JSON::error(array('data' => array( 'message' => 'File path not supplied')));
	OCP\Util::writeLog('files_texteditor','No file path supplied', OCP\Util::ERROR);
} else if($mtime == ''){
	OCP\JSON::error(array('data' => array( 'message' => 'File mtime not supplied')));
	OCP\Util::writeLog('files_texteditor','No file mtime supplied' ,OCP\Util::ERROR);
} else if(!$filecontents){
	OCP\JSON::error(array('data' => array( 'message' => 'File contents not supplied')));
	OCP\Util::writeLog('files_texteditor','The file contents was not supplied',OCP\Util::ERROR);	
}