'Ensure the logged in user has authorized silent OpenID authorization.
Silent OpenID authorization allows access tokens and id tokens to be
granted to clients without any user prompt or interaction.
:param request: The HTTP Request (oauthlib.common.Request)
:rtype: True or False
Method is used by:
- OpenIDConnectAuthCode
- OpenIDConnectImplicit
- OpenIDConnectHybrid'

def validate_silent_authorization(self, request):

    raise NotImplementedError(u'Subclasses    must    implement    this    method.')
