How are grants handled in WebDAV?

Grants in WebDAV are handled through the use of access control lists (ACLs). An ACL is a collection of permissions that determine what users or groups can access a particular resource. In WebDAV, these permissions are associated with specific HTTP verbs (such as GET, POST, PUT, and DELETE) and can be set at the individual file or folder level.

To set an ACL in WebDAV, the client sends an HTTP request to the server with a set of XML elements that define the permissions and who they apply to. These elements include a tag, which contains a list of (access control entry) tags. Each tag specifies a principal (user or group) and a set of privileges (HTTP verbs and other actions).

When a client attempts to access a WebDAV resource, the server checks the ACL to determine whether the user or group has the necessary permissions. If the user or group does not have the required privileges, the server will return an HTTP 403 (Forbidden) error code.

Overall, ACLs provide a flexible and granular way of controlling access to WebDAV resources, allowing administrators to set permissions that fit the specific needs of their organization or project.