Searching for a file in Nextcloud - webhooks

Question

I need to check if I have a file in my Nextcloud before uploading another one (same name). I haven't found any way to do this using curl (the command I'm using to upload the new file). So, searching in the client API of Nextcloud I've found the webDAV search.
I've tried to use it before the upload to check if the file exists. This is what I've achieved:
curl -u myUser:myPass 'https://nextcloud.customExample.com/remote.php/dav/' -X SEARCH -u myUser:myPass -H "content-Type: text/xml" --data '<?xml version="1.0" encoding="UTF-8"?>
<d:searchrequest xmlns:d="DAV:" xmlns:oc="http://owncloud.org/ns">
<d:basicsearch>
<d:select>
<d:prop>
<d:displayname/>
</d:prop>
</d:select>
<d:from>
<d:scope>
<d:href>/files/myFolder/myFile.apk</d:href>
<d:depth>infinity</d:depth>
</d:scope>
</d:from>
<d:where>
<d:like>
<d:prop>
<d:getcontenttype/>
</d:prop>
<d:literal>text/%</d:literal>
</d:like>
</d:where>
<d:orderby>
<d:prop>
<oc:size/>
</d:prop>
<d:ascending/>
</d:orderby>
</d:basicsearch>
</d:searchrequest>'
I'm getting this error when executing:
<?xml version="1.0" encoding="utf-8"?>
<d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns">
<s:exception>Sabre\DAV\Exception\NotFound</s:exception>
<s:message>Principal with name myFolder not found</s:message>
</d:error>
The folder myFolder is, as I see, in the root of my Nextcloud. I don’t know if I need something more to add before it (as I added “files”).
The user has permissions and using the curl command to upload the file with this same user is working.

Answer 1

After all I've found an easier way to check if a file exists:
url='http://example.com/index.html'
if ( curl -o/dev/null -sfI "$url" ); then
echo "URL exists"
else
echo "URL does not exist"
fi
To that curl command you can add the --user parameter if you need authentication.
I've found it here.