nextcloud/apps/files_texteditor/ajax/savefile.php

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<?php
/**
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* ownCloud - files_texteditor
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*
* @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
require_once('../../../lib/base.php');
// Check if we are a user
OC_JSON::checkLoggedIn();
// Save the file data
$filecontents = htmlspecialchars_decode($_POST['filecontents']);
$file = $_POST['file'];
$dir = $_POST['dir'];
$path = $dir.'/'.$file;
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$force = isset($_POST['force']) ? $_POST['force'] : false;
$sessionname = sha1('oc_file_hash_'.$path);
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function do_save($path,$filecontents){
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$sessionname = md5('oc_file_hash_'.$path);
OC_Filesystem::update_session_file_hash($sessionname,sha1(htmlspecialchars($filecontents)));
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OC_Filesystem::file_put_contents($path, $filecontents);
}
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// Check if file modified whilst editing?
if(isset($_SESSION[$sessionname])){
if(!empty($_SESSION[$sessionname])){
// Compare to current hash of file.
$savedfilecontents = htmlspecialchars(OC_Filesystem::file_get_contents($path));
$hash = md5($savedfilecontents);
$originalhash = $_SESSION[$sessionname];
// Compare with hash taken when file was opened
if($hash != $originalhash){
// Someone has played with the file while you were editing
// Force save?
if($force){
do_save($path, $filecontents);
OC_JSON::success();
} else {
// No force
OC_JSON::error(array('data' => array( 'message' => $l10n->t('The file has been edited since you opened it. Overwrite the file?'))));
}
} else {
// No body has edited it whilst you were, so save the file
// Update the session hash.
do_save($path,$filecontents);
OC_JSON::success();
}
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}
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} else {
// No session value set for soem reason, just save the file.
do_save($path,$filecontents);
OC_JSON::success();
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}