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example
Or for longer, use three backticks above and below the code snippet:
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version: 26.0.3
Operating system and version: Ubuntu 22.04.2
Apache or nginx version: Apache 2.4.52
PHP version: PHP 8.1.2
The issue you are facing:
Is this the first time you’ve seen this error?: Yes
Steps to replicate it:
- Everything seems to be running fine from a user’s perspective.
- Log in to Nextcloud & open the Administrator Logging page.
- Read log.
The output of your Nextcloud log in Admin > Logging: (I abbreviated this. There are somewhat regular entries regarding locked files. The screen is full of this basic pattern.)
Error PHP Undefined array key 1 at /var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php#183
2023-07-19T10:55:35-0400
Error no app in context "Documents/XXXXXXXX XXXXXX/XXXXXXXX XXXXXX XXXXXXXXX/XXXXXXXXXXXXXXXXXXXXXX" is locked
2023-07-19T10:55:35-0400
Error PHP Undefined array key 1 at /var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php#183
2023-07-19T10:55:35-0400
Error no app in context "Documents/XXXXXXXX XXXXXX/XXXXXXXX XXXXXX XXXXXXXXX/XXXXXXXXXXXXXXXXXXXXXX" is locked
2023-07-19T10:55:35-0400
Error PHP Undefined array key 1 at /var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php#183
2023-07-19T10:55:35-0400
Error PHP Undefined array key 1 at /var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php#183
2023-07-19T10:54:36-0400
Error PHP Undefined array key 1 at /var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php#183
2023-07-19T10:53:36-0400
Error PHP Undefined array key 1 at /var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php#183
2023-07-19T10:52:35-0400
Error PHP Undefined array key 1 at /var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php#183
2023-07-19T10:51:36-0400
Error no app in context "Documents/XXXXXXXX XXXXXX/XXXXXXXX XXXXXX XXXXXXXXX/XXXXXXXXXXXXXXXXXXXXXX" is locked
2023-07-19T10:51:36-0400
Error PHP Undefined array key 1 at /var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php#183
2023-07-19T10:51:36-0400
Error no app in context "Documents/XXXXXXXX XXXXXX/XXXXXXXX XXXXXX XXXXXXXXX/XXXXXXXXXXXXXXXXXXXXXX" is locked
2023-07-19T10:51:36-0400
Error PHP Undefined array key 1 at /var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php#183
2023-07-19T10:51:35-0400
Error PHP Undefined array key 1 at /var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php#183
2023-07-19T10:50:35-0400
Error no app in context "Documents/XXXXXXXX XXXXXX/XXXXXXXX XXXXXX XXXXXXXXX/XXXXXXXXXXXXXXXXXXXXXX" is locked
2023-07-19T10:50:35-0400
Error PHP Undefined array key 1 at /var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php#183
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'XXXXXXXXXXXXXXXXXXX',
'passwordsalt' => 'XXXXXXXXXXXXXXXXXXX',
'secret' => 'XXXXXXXXXXXXXXXXXXXXXXXX',
'trusted_domains' =>
array (
0 => 'XXXXXXXX.com',
1 => 'XXXXXXXXXXX',
2 => 'localhost',
3 => 'www.XXXXXXXXXXX.com',
4 => 'cloud.XXXXXXXXXXXXXXXXXX.com',
),
'datadirectory' => '/home/nextcloud/data',
'overwrite.cli.url' => 'https://XXXXXXXXXXXXXXXXX.com/nextcloud',
'htaccess.RewriteBase' => '/nextcloud',
'dbtype' => 'mysql',
'version' => '26.0.3.2',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'XXXXXXXXXX',
'dbpassword' => 'XXXXXXXXXXXXXX',
'logtimezone' => 'UTC',
'default_phone_region' => 'US',
'installed' => true,
'memcache.local' => '\\OC\\Memcache\\APCu',
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'mail_domain' => 'XXXXXXXXX.com',
'mail_from_address' => 'XXXXXXXX',
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'tls',
'mail_smtpauthtype' => 'PLAIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'XXXXXXXXXX.XXXXXXXX.com',
'mail_smtpport' => '587',
'mail_smtpname' => 'XXXXXXXXX@XXXXXXXXX.com',
'mail_smtppassword' => 'XXXXXXXXXXXXXXX',
'auth.bruteforce.protection.enabled' => true,
'updater.release.channel' => 'stable',
'check_for_working_wellknown_setup' => true,
'check_for_working_htaccess' => true,
'app_install_overwrite' =>
array (
0 => 'calendar',
1 => 'ownpad',
2 => 'sharerenamer',
),
'mysql.utf8mb4' => true,
'encryption.legacy_format_support' => false,
'encryption.key_storage_migrated' => false,
'data-fingerprint' => 'XXXXXXXXXXXXXXXX',
'memories.exiftool' => '/var/www/nextcloud/apps/memories/exiftool-bin/exiftool-amd64-glibc',
'memories.vod.path' => '/var/www/nextcloud/apps/memories/exiftool-bin/go-vod-amd64',
'memories.vod.ffmpeg' => '/usr/bin/ffmpeg',
'memories.vod.ffprobe' => '/usr/bin/ffprobe',
);
The output of your Apache/nginx/system log in /var/log/____: /var/log/syslog
[Pasted here](https://privatebin.net/?062dd9d07c4ab7fc#46taBBdigppyzghAoUQL9yaSwbQUSS2XNch2wVyup71k)
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
[Pasted here](https://privatebin.net/?ef09c6fb595524f3#73Ro6Lx4UqXiKLbYPET39Xg3xYLmQZrshSrq4diW9ZFL)
I checked the MultipartRequestParser.php file and here are the contents:
<?php
/**
* @copyright Copyright (c) 2021, Louis Chemineau <louis@chmn.me>
*
* @author Louis Chemineau <louis@chmn.me>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\DAV\BulkUpload;
use Sabre\HTTP\RequestInterface;
use Sabre\DAV\Exception;
use Sabre\DAV\Exception\BadRequest;
use Sabre\DAV\Exception\LengthRequired;
use OCP\AppFramework\Http;
class MultipartRequestParser {
/** @var resource */
private $stream;
/** @var string */
private $boundary = "";
/** @var string */
private $lastBoundary = "";
/**
* @throws BadRequest
*/
public function __construct(RequestInterface $request) {
$stream = $request->getBody();
$contentType = $request->getHeader('Content-Type');
if (!is_resource($stream)) {
throw new BadRequest('Body should be of type resource');
}
if ($contentType === null) {
throw new BadRequest("Content-Type can not be null");
}
$this->stream = $stream;
$boundary = $this->parseBoundaryFromHeaders($contentType);
$this->boundary = '--'.$boundary."\r\n";
$this->lastBoundary = '--'.$boundary."--\r\n";
}
/**
* Parse the boundary from the Content-Type header.
* Example: Content-Type: "multipart/related; boundary=boundary_bf38b9b4b10a303a28ed075624db3978"
*
* @throws BadRequest
*/
private function parseBoundaryFromHeaders(string $contentType): string {
try {
[$mimeType, $boundary] = explode(';', $contentType);
[$boundaryKey, $boundaryValue] = explode('=', $boundary);
} catch (\Exception $e) {
throw new BadRequest("Error while parsing boundary in Content-Type header.", Http::STATUS_BAD_REQUEST, $e);
}
$boundaryValue = trim($boundaryValue);
// Remove potential quotes around boundary value.
if (substr($boundaryValue, 0, 1) == '"' && substr($boundaryValue, -1) == '"') {
$boundaryValue = substr($boundaryValue, 1, -1);
}
if (trim($mimeType) !== 'multipart/related') {
throw new BadRequest('Content-Type must be multipart/related');
}
if (trim($boundaryKey) !== 'boundary') {
throw new BadRequest('Boundary is invalid');
}
return $boundaryValue;
}
/**
* Check whether the stream's cursor is sitting right before the provided string.
*
* @throws Exception
*/
private function isAt(string $expectedContent): bool {
$expectedContentLength = strlen($expectedContent);
$content = fread($this->stream, $expectedContentLength);
if ($content === false) {
throw new Exception('An error occurred while checking content');
}
$seekBackResult = fseek($this->stream, -$expectedContentLength, SEEK_CUR);
if ($seekBackResult === -1) {
throw new Exception("Unknown error while seeking content", Http::STATUS_INTERNAL_SERVER_ERROR);
}
return $expectedContent === $content;
}
/**
* Check whether the stream's cursor is sitting right before the boundary.
*/
private function isAtBoundary(): bool {
return $this->isAt($this->boundary);
}
/**
* Check whether the stream's cursor is sitting right before the last boundary.
*/
public function isAtLastBoundary(): bool {
return $this->isAt($this->lastBoundary);
}
/**
* Parse and return the next part of the multipart headers.
*
* Example:
* --boundary_azertyuiop
* Header1: value
* Header2: value
*
* Content of
* the part
*
*/
public function parseNextPart(): array {
$this->readBoundary();
$headers = $this->readPartHeaders();
$content = $this->readPartContent($headers["content-length"], $headers["x-file-md5"]);
return [$headers, $content];
}
/**
* Read the boundary and check its content.
*
* @throws BadRequest
*/
private function readBoundary(): string {
if (!$this->isAtBoundary()) {
throw new BadRequest("Boundary not found where it should be.");
}
return fread($this->stream, strlen($this->boundary));
}
/**
* Return the headers of a part of the multipart body.
*
* @throws Exception
* @throws BadRequest
* @throws LengthRequired
*/
private function readPartHeaders(): array {
$headers = [];
while (($line = fgets($this->stream)) !== "\r\n") {
if ($line === false) {
throw new Exception('An error occurred while reading headers of a part');
}
try {
[$key, $value] = explode(':', $line, 2);
$headers[strtolower(trim($key))] = trim($value);
} catch (\Exception $e) {
throw new BadRequest('An error occurred while parsing headers of a part', Http::STATUS_BAD_REQUEST, $e);
}
}
if (!isset($headers["content-length"])) {
throw new LengthRequired("The Content-Length header must not be null.");
}
if (!isset($headers["x-file-md5"])) {
throw new BadRequest("The X-File-MD5 header must not be null.");
}
return $headers;
}
/**
* Return the content of a part of the multipart body.
*
* @throws Exception
* @throws BadRequest
*/
private function readPartContent(int $length, string $md5): string {
$computedMd5 = $this->computeMd5Hash($length);
if ($md5 !== $computedMd5) {
throw new BadRequest("Computed md5 hash is incorrect.");
}
$content = stream_get_line($this->stream, $length);
if ($content === false) {
throw new Exception("Fail to read part's content.");
}
if (feof($this->stream)) {
throw new Exception("Unexpected EOF while reading stream.");
}
// Read '\r\n'.
stream_get_contents($this->stream, 2);
return $content;
}
/**
* Compute the MD5 hash of the next x bytes.
*/
private function computeMd5Hash(int $length): string {
$context = hash_init('md5');
hash_update_stream($context, $this->stream, $length);
fseek($this->stream, -$length, SEEK_CUR);
return hash_final($context);
}
}
It might be helpful to note that this install was originally on Ubuntu 16.04 as Nextcloud 18 (or earlier?) and then upgraded to 18.04 where it was stuck on Nextcloud 20.x for quite some time. I finally migrated it to new hardware with a new OS a few months ago & upgraded it through the major versions to this point.
Any help with this would be appreciated.
