Trying to request dav endpoint with POST request gives 500 Internal Server Error

[dpakach]

Steps to reproduce

1.Try to do a dav request on webdav endpoint with POST request

curl http://localhost/remote.php/dav/files/admin/PARENT/parent.txt -u admin:admin  -v -XPOST 

Expected behaviour

Server should not throw any errors and give 501 Not Implemented since POST is not used in webDAV

Actual behaviour

It gives 500 Internal Server Error with response body

<?xml version="1.0" encoding="utf-8"?>
<d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns">
  <s:exception>TypeError</s:exception>
  <s:message>explode() expects parameter 2 to be string, null given</s:message>
</d:error>

And server log

{
  "reqId": "qMZqVbFOTJlYJ7oT0zL4",
  "level": 4,
  "time": "2021-02-04T07:25:15+00:00",
  "remoteAddr": "127.0.0.1",
  "user": "admin",
  "app": "webdav",
  "method": "POST",
  "url": "/remote.php/dav/files/admin/PARENT/parent.txt",
  "message": "Exception: explode() expects parameter 2 to be string, null given: {\"Exception\":\"TypeError\",\"Message\":\"explode() expects parameter 2 to be string, null given\",\"Code\":0,\"Trace\":\"#0 \\/home\\/dipakacharya\\/www\\/core\\/lib\\/composer\\/sabre\\/dav\\/lib\\/DAV\\/Browser\\/Plugin.php(160): explode()\\n#1 \\/home\\/dipakacharya\\/www\\/core\\/lib\\/composer\\/sabre\\/event\\/lib\\/WildcardEmitterTrait.php(89): Sabre\\\\DAV\\\\Browser\\\\Plugin->httpPOST()\\n#2 \\/home\\/dipakacharya\\/www\\/core\\/lib\\/composer\\/sabre\\/dav\\/lib\\/DAV\\/Server.php(472): Sabre\\\\DAV\\\\Server->emit()\\n#3 \\/home\\/dipakacharya\\/www\\/core\\/lib\\/composer\\/sabre\\/dav\\/lib\\/DAV\\/Server.php(253): Sabre\\\\DAV\\\\Server->invokeMethod()\\n#4 \\/home\\/dipakacharya\\/www\\/core\\/apps\\/dav\\/lib\\/Server.php(330): Sabre\\\\DAV\\\\Server->start()\\n#5 \\/home\\/dipakacharya\\/www\\/core\\/apps\\/dav\\/appinfo\\/v2\\/remote.php(31): OCA\\\\DAV\\\\Server->exec()\\n#6 \\/home\\/dipakacharya\\/www\\/core\\/remote.php(165): require_once('\\/home\\/dipakacha...')\\n#7 {main}\",\"File\":\"\\/home\\/dipakacharya\\/www\\/core\\/lib\\/composer\\/sabre\\/dav\\/lib\\/DAV\\/Browser\\/Plugin.php\",\"Line\":160}"

Server configuration

Operating system: ubuntu 20.04

Web server: apache2

Database: mysql

PHP version: 7.4

ownCloud version: (see ownCloud admin page) latest git master

Updated from an older ownCloud or fresh install: fresh

Where did you install ownCloud from: git

[dpakach]

Another really strange thing, the server responds correctly when we send data with POST

❯ curl http://localhost/remote.php/dav/files/admin/PARENT/parent.txt -u admin:admin  -XPOST -d "HELLO" 
<?xml version="1.0" encoding="utf-8"?>
<d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns">
  <s:exception>Sabre\DAV\Exception\NotImplemented</s:exception>
  <s:message>There was no plugin in the system that was willing to handle this POST method.</s:message>
</d:error>

[phil-davis]

This looks like a sabre/dav issue. I raised sabre-io/dav#1324
And PR sabre-io/dav#1325 should fix it. When that is reviewed and released, we can bump the dependency in owncloud/core and re-test.

[dpakach]

Should be fixed not after the update in sabre