server.py

def add_role_principals(userid, request):
    return request.jwt_claims.get('roles', [])

def main(global_config, **settings):
        """ This function returns a Pyramid WSGI application.
        """
        config = Configurator(settings=settings)
        config.include('.cors')
        config.add_cors_preflight_handler()

        # Enable JWT - JSON Web Token based authentication
        config.set_root_factory(RootACL)
        config.set_authorization_policy(ACLAuthorizationPolicy())
        config.include('pyramid_jwt')
        config.set_jwt_authentication_policy('secret200', auth_type="Bearer", 
                                                callback=add_role_principals)
        
        # configure custom JSON renderers 
        json_renderer = JSON()
        json_renderer.add_adapter(datetime.date, datetime_adapter)
        json_renderer.add_adapter(Decimal, decimal_adapter)
        config.add_renderer('json_custom', json_renderer)

        # Customer Info JSON
        config.add_route('get_customer_name', '/customerinfo/name.json')
        config.add_route('login', '/user/login.json')

        config.scan()
        return config.make_wsgi_app()