Set/Unset arbitrary metadata not implemented

[glpatcern]

The functions in https://github.com/mahdibaghbani//nc-sciencemesh/blob/owncloud/lib/Controller/RevaController.php#L984-L1015 return 503, but they are needed for uploads to work as the remote client attempts to set a metadata attr (and fails).

[glpatcern]

For now this can be mitigated by responding STATUS_OK and the uploads work.

[glpatcern]

To implement this, the following calls are useful (replace myattribute and myvalue accordingly):

1 - setting an xattr:

curl -X PROPPATCH -u user:pwd -H "Content-Type: application/xml" -d '<?xml version="1.0" encoding="utf-8"?><d:propertyupdate xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns" xmlns:oc="http://owncloud.org/ns"><d:set><d:prop><s:myattribute>myvalue</s:myattribute></d:prop></d:set></d:propertyupdate>' https://owncloud-server/remote.php/dav/files/user/path/to/file

Response example:

<?xml version="1.0"?>
<d:multistatus xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns" xmlns:oc="http://owncloud.org/ns"><d:response><d:href>/remote.php/dav/files/einstein/welcome.txt</d:href><d:propstat><d:prop><s:myattribute/></d:prop><d:status>HTTP/1.1 200 OK</d:status></d:propstat></d:response></d:multistatus>

2 - retrieving an xattr:

curl -X PROPFIND -u user:pwd -H "Content-Type: application/xml" -d '<?xml version="1.0" encoding="utf-8"?><d:propfind xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns" xmlns:oc="http://owncloud.org/ns"><d:prop><s:myattribute/></d:prop></d:propfind>'  https://owncloud-server/remote.php/dav/files/user/path/to/file

Response example:

<?xml version="1.0"?>
<d:multistatus xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns" xmlns:oc="http://owncloud.org/ns"><d:response><d:href>/remote.php/dav/files/einstein/welcome.txt</d:href><d:propstat><d:prop><s:myattribute>myvalue</s:myattribute></d:prop><d:status>HTTP/1.1 200 OK</d:status></d:propstat></d:response></d:multistatus>