code: def get_proxy(self, input_):
          
          if input_._http_request is not None:
              authentication = DjangoAuthentication()
              authentication.set_django_user(input_._http_request.user, input_._use_user_id)
          elif input_._xblock_user is not None:
              authentication = XBlockAuthentication()
              authentication.set_xblock_user(input_._xblock_user)
          else:
              authentication = None
  
          if authentication is not None:
              effective_agent_id = authentication.get_agent_id()
          else:
              effective_agent_id = input_._effective_agent_id
  
          if input_._locale is not None:
              locale = input_._locale
          else:
              locale = None
          return rules.Proxy(authentication=authentication,
                             effective_agent_id=effective_agent_id,
                             locale=locale)
docs: Gets a proxy.
  
          :param input: a proxy condition
          :type input: ``osid.proxy.ProxyCondition``
          :return: a proxy
          :rtype: ``osid.proxy.Proxy``
          :raise: ``NullArgument`` -- ``input`` is ``null``
          :raise: ``OperationFailed`` -- unable to complete request
          :raise: ``PermissionDenied`` -- authorization failure
          :raise: ``Unsupported`` -- ``input`` is not of this service
  
          *compliance: mandatory -- This method is must be implemented.*