Download error when using GROUP FOLDERS

[lbdroid]

server.js log:

pdftk returned an error when merging Error: Unable to find file.
Error: Failed to open PDF file: 
   -
Errors encountered.  No output created.
Done.  Input errors, so no output created.

Apache log:

###.###.###.### - - [05/Apr/2021:13:23:59 -0400] "GET /apps/pdfdraw/download/1928335 HTTP/1.1" 404 192 "-" "-"

This could be solved trivially by using webdav for file operations, which may go along well with #6

[lbdroid]

This problem is caused by tricking the userid out of the storages table here; https://github.com/strukturag/pdfdraw/blob/master/lib/Controller/ApiController.php#L251

Dirty fix:

                $ownerId = "testuser";
                if (empty($homeId) || strpos($homeId, 'home::') !== 0) {
                        //return new DataResponse([], Http::STATUS_NOT_FOUND);
                } else {
                        $ownerId = substr($homeId, 6);
                }
                $files = $this->root->getUserFolder($ownerId)->getById($fileId);

"testuser" has to be a valid uid on the system with access to the resource.