'Create a C{L{Response}} object from a successful OpenID
library response
(C{L{openid.consumer.consumer.SuccessResponse}}) response
message
@param success_response: A SuccessResponse from consumer.complete()
@type success_response: C{L{openid.consumer.consumer.SuccessResponse}}
@rtype: Response or None
@returns: A provider authentication policy response from the
data that was supplied with the C{id_res} response or None
if the provider sent no signed PAPE response arguments.'

def fromSuccessResponse(cls, success_response):

    self = cls()
    args = success_response.getSignedNS(self.ns_uri)
    is_openid1 = success_response.isOpenID1()
    if (args is not None):
        self.parseExtensionArgs(args, is_openid1)
        return self
    else:
        return None
