code: def csrf_protect_all_post_and_cross_origin_requests():
      
      success = None
  
      if is_cross_origin(request):
          logger.warning("Received cross origin request. Aborting")
          abort(403)
      if request.method in ["POST", "PUT"]:
          token = session.get("csrf_token")
          if token == request.form.get("csrf_token"):
              return success
  
          elif token == request.environ.get("HTTP_X_CSRFTOKEN"):
              return success
  
          else:
              logger.warning("Received invalid csrf token. Aborting")
              abort(403)
docs: returns None upon success