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_CreateProtectionGroup.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/aws-sdk-go-v2/service/shield/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Creates a grouping of protected resources so they can be handled as a
// collective. This resource grouping improves the accuracy of detection and
// reduces false positives.
func (c *Client) CreateProtectionGroup(ctx context.Context, params *CreateProtectionGroupInput, optFns ...func(*Options)) (*CreateProtectionGroupOutput, error) {
	if params == nil {
		params = &CreateProtectionGroupInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "CreateProtectionGroup", params, optFns, c.addOperationCreateProtectionGroupMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*CreateProtectionGroupOutput)
	out.ResultMetadata = metadata
	return out, nil
}

type CreateProtectionGroupInput struct {

	// Defines how Shield combines resource data for the group in order to detect,
	// mitigate, and report events.
	//   - Sum - Use the total traffic across the group. This is a good choice for
	//   most cases. Examples include Elastic IP addresses for EC2 instances that scale
	//   manually or automatically.
	//   - Mean - Use the average of the traffic across the group. This is a good
	//   choice for resources that share traffic uniformly. Examples include accelerators
	//   and load balancers.
	//   - Max - Use the highest traffic from each resource. This is useful for
	//   resources that don't share traffic and for resources that share that traffic in
	//   a non-uniform way. Examples include Amazon CloudFront and origin resources for
	//   CloudFront distributions.
	//
	// This member is required.
	Aggregation types.ProtectionGroupAggregation

	// The criteria to use to choose the protected resources for inclusion in the
	// group. You can include all resources that have protections, provide a list of
	// resource Amazon Resource Names (ARNs), or include all resources of a specified
	// resource type.
	//
	// This member is required.
	Pattern types.ProtectionGroupPattern

	// The name of the protection group. You use this t
    
func (c *Client) addOperationCreateProtectionGroupMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpCreateProtectionGroup{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpCreateProtectionGroup{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "CreateProtectionGroup"); 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 = addOpCreateProtectionGroupValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opCreateProtectionGroup(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
}