webdav, oauth2_proxy, nginx. That’s all you need. You can create your own issuer or also use dex I think. Fancy authnz is easy to do with openresty instead of

webdav, oauth2_proxy, nginx. That’s all you need. You can create your own issuer or also use dex I think. Fancy authnz is easy to do with openresty instead of vanilla nginx. Alternatively just use own cloud/nextcloud