old_contents: 
  from mezzanine.conf import settings
  
  from cartridge.shop.models import Cart
  
  
  class ShopMiddleware(object):
  
      def __init__(self):
          old = ("SHOP_SSL_ENABLED", "SHOP_FORCE_HOST", "SHOP_FORCE_SSL_VIEWS")
          for name in old:
              try:
                  getattr(settings, name)
              except AttributeError:
                  pass
              else:
                  import warnings
                  warnings.warn("The settings %s are deprecated; "
                      "use SSL_ENABLED, SSL_FORCE_HOST and "
                      "SSL_FORCE_URL_PREFIXES, and add "
                      "mezzanine.core.middleware.SSLRedirectMiddleware to "
                      "MIDDLEWARE_CLASSES." % ", ".join(old))
                  break
  
      def process_request(self, request):
          """
          Adds cart and wishlist attributes to the current request.
          """
          request.cart = Cart.objects.from_request(request)
          wishlist = request.COOKIES.get("wishlist", "").split(",")
          if not wishlist[0]:
              wishlist = []
          request.wishlist = wishlist
  
new_contents: 
  from mezzanine.conf import settings
  
  from cartridge.shop.models import Cart
  
  
  class SSLRedirect(object):
  
      def __init__(self):
          old = ("SHOP_SSL_ENABLED", "SHOP_FORCE_HOST", "SHOP_FORCE_SSL_VIEWS")
          for name in old:
              try:
                  getattr(settings, name)
              except AttributeError:
                  pass
              else:
                  import warnings
                  warnings.warn("The settings %s are deprecated; "
                      "use SSL_ENABLED, SSL_FORCE_HOST and "
                      "SSL_FORCE_URL_PREFIXES, and add "
                      "mezzanine.core.middleware.SSLRedirectMiddleware to "
                      "MIDDLEWARE_CLASSES." % ", ".join(old))
                  break
  
  
  class ShopMiddleware(SSLRedirect):
      """
      Adds cart and wishlist attributes to the current request.
      """
      def process_request(self, request):
          request.cart = Cart.objects.from_request(request)
          wishlist = request.COOKIES.get("wishlist", "").split(",")
          if not wishlist[0]:
              wishlist = []
          request.wishlist = wishlist
  
subject: Add deprecated fallback for SSLMiddleware.