Get properties of a Topic

        :type topic: string
        :param topic: The ARN of the new topic.

        :type token: string
        :param token: Short-lived token sent to and endpoint during
                      the Subscribe operation.

        :type authenticate_on_unsubscribe: bool
        :param authenticate_on_unsubscribe: Optional parameter indicating
                                            that you wish to disable
                                            unauthenticated unsubscription
                                            of the subscription.

def confirm_subscription(self, topic, token,
                             authenticate_on_unsubscribe=False):
        """
        Get properties of a Topic

        :type topic: string
        :param topic: The ARN of the new topic.

        :type token: string
        :param token: Short-lived token sent to and endpoint during
                      the Subscribe operation.

        :type authenticate_on_unsubscribe: bool
        :param authenticate_on_unsubscribe: Optional parameter indicating
                                            that you wish to disable
                                            unauthenticated unsubscription
                                            of the subscription.

        """
        params = {'ContentType' : 'JSON',
                  'TopicArn' : topic,
                  'Token' : token}
        if authenticate_on_unsubscribe:
            params['AuthenticateOnUnsubscribe'] = 'true'
        response = self.make_request('ConfirmSubscription', params, '/', 'GET')
        body = response.read()
        if response.status == 200:
            return json.loads(body)
        else:
            boto.log.error('%s %s' % (response.status, response.reason))
            boto.log.error('%s' % body)
            raise self.ResponseError(response.status, response.reason, body)