You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: api_op_AssociateDRTRole.go
    path of file: ./repos/aws-sdk-go-v2/service/shield
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package shield

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Authorizes the Shield Response Team (SRT) using the specified role, to access
// your Amazon Web Services account to assist with DDoS attack mitigation during
// potential attacks. This enables the SRT to inspect your WAF configuration and
// create or update WAF rules and web ACLs. You can associate only one RoleArn
// with your subscription. If you submit an AssociateDRTRole request for an
// account that already has an associated role, the new RoleArn will replace the
// existing RoleArn . Prior to making the AssociateDRTRole request, you must
// attach the AWSShieldDRTAccessPolicy managed policy to the role that you'll
// specify in the request. You can access this policy in the IAM console at
// AWSShieldDRTAccessPolicy (https://console.aws.amazon.com/iam/home?#/policies/arn:aws:iam::aws:policy/service-role/AWSShieldDRTAccessPolicy)
// . For more information see Adding and removing IAM identity permissions (https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_manage-attach-detach.html)
// . The role must also trust the service principal drt.shield.amazonaws.com . For
// more information, see IAM JSON policy elements: Principal (https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_principal.html)
// . The SRT will have access only to your WAF and Shield resources. By submitting
// this request, you authorize the SRT to inspect your WAF and Shield configuration
// and create and update WAF rules an
    
func (c *Client) addOperationAssociateDRTRoleMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpAssociateDRTRole{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpAssociateDRTRole{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "AssociateDRTRole"); err != nil {
		return fmt.Errorf("add protocol finalizers: %v", err)
	}

	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = addClientRequestID(stack); err != nil {
		return err
	}
	if err = addComputeContentLength(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addComputePayloadSHA256(stack); err != nil {
		return err
	}
	if err = addRetry(stack, options); err != nil {
		return err
	}
	if err = addRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = addRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addClientUserAgent(stack, options); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addSetLegacyContextSigningOptionsMiddleware(stack); err != nil {
		return err
	}
	if err = addOpAssociateDRTRoleValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opAssociateDRTRole(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = addRecursionDetection(stack); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	return nil
}