[OCM] Switching from view to edit permissions not working

[kobergj]

Describe the bug

On federated shares one cannot switch from edit to view permissions or vice versa

Steps to reproduce

1. Setup two ocis instances with ocm configured
2. Share a file or folder from one instance to another with edit permissions
3. Switch permissions to view

Expected behavior

The federated share has now view permissions

Actual behavior

An error occurs, the file has still edit permissions

Setup

ocm needs to be configured

Additional context

Workaround: delete the share and create a new one

[kobergj]

Needs discussion: Updating a share is NOT supported by the ocm spec. Recommended way is to remove the share and create a new one. https://cs3org.github.io/OCM-API/docs.html?branch=v1.1.0&repo=OCM-API&user=cs3org

Implementing this would require to build this from scratch. Means spec, endpoints and frontend.

One way or another this is not a bug - it works as designed.

cc @dj4oC @unbekanntes-pferd