Roll Back Anonymous Space Permissions via Listener

package examples

import com.atlassian.confluence.event.events.permission.SpacePermissionChangeEvent
import com.atlassian.confluence.security.SpacePermission
import com.atlassian.confluence.security.SpacePermissionManager
import com.atlassian.sal.api.component.ComponentLocator

def spacePermissionManager = ComponentLocator.getComponent(SpacePermissionManager)
def spacePermissionChangeEvent = event as SpacePermissionChangeEvent
def spacePermissions = spacePermissionChangeEvent.getPermissions()

spacePermissions.each { SpacePermission permission ->
    // if user subject and group is null, permission is anonymous
    if (!permission.getUserSubject() && !permission.getGroup() && permission.space) {
        log.debug("Removing anonymous permission ${permission.type} for space ${permission.space.key}")
        spacePermissionManager.removePermission(permission)
    }
}