text: from rest_framework import permissions
  
  from grandchallenge.serving.permissions import user_can_download_image
  
  
  class ImagePermission(permissions.BasePermission):
      """
      Permission class for APIViews in retina app.
      Checks if user is in retina graders or admins group
      """
  
      def has_object_permission(self, request, view, obj):
          return user_can_download_image(user=request.user, image=obj)
  