code: def _get_permission(self, authorizer_name, authorizer_lambda_function_arn):
          
          rest_api = ApiGatewayRestApi(self.logical_id, depends_on=self.depends_on, attributes=self.resource_attributes)
          api_id = rest_api.get_runtime_attr('rest_api_id')
  
          partition = ArnGenerator.get_partition_name()
          resource = '${__ApiId__}/authorizers/*'
          source_arn = fnSub(ArnGenerator.generate_arn(partition=partition, service='execute-api', resource=resource),
                             {"__ApiId__": api_id})
  
          lambda_permission = LambdaPermission(self.logical_id + authorizer_name + 'AuthorizerPermission',
                                               attributes=self.passthrough_resource_attributes)
          lambda_permission.Action = 'lambda:invokeFunction'
          lambda_permission.FunctionName = authorizer_lambda_function_arn
          lambda_permission.Principal = 'apigateway.amazonaws.com'
          lambda_permission.SourceArn = source_arn
  
          return lambda_permission
docs: Constructs and returns the Lambda Permission resource allowing the Authorizer to invoke the function.
  
          :returns: the permission resource
          :rtype: model.lambda_.LambdaPermission