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_CreateDirectConnectGatewayAssociationProposal.go
    path of file: ./repos/aws-sdk-go-v2/service/directconnect
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package directconnect

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

// Creates a proposal to associate the specified virtual private gateway or
// transit gateway with the specified Direct Connect gateway. You can associate a
// Direct Connect gateway and virtual private gateway or transit gateway that is
// owned by any Amazon Web Services account.
func (c *Client) CreateDirectConnectGatewayAssociationProposal(ctx context.Context, params *CreateDirectConnectGatewayAssociationProposalInput, optFns ...func(*Options)) (*CreateDirectConnectGatewayAssociationProposalOutput, error) {
	if params == nil {
		params = &CreateDirectConnectGatewayAssociationProposalInput{}
	}

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

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

type CreateDirectConnectGatewayAssociationProposalInput struct {

	// The ID of the Direct Connect gateway.
	//
	// This member is required.
	DirectConnectGatewayId *string

	// The ID of the Amazon Web Services account that owns the Direct Connect gateway.
	//
	// This member is required.
	DirectConnectGatewayOwnerAccount *string

	// The ID of the virtual private gateway or transit gateway.
	//
	// This member is required.
	GatewayId *string

	// The Amazon VPC prefixes to advertise to the Direct Connect gateway.
	AddAllowedPrefixesToDirectConnectGateway []types.RouteFilterPrefix

	// The Amazon VPC prefixes to no longer advertise to the Direct Connect gateway.
	RemoveAllowedPrefixesToDirectConnectGateway []types.RouteFilterPrefix

	noSmithyDocumentS
    
func (c *Client) addOperationCreateDirectConnectGatewayAssociationProposalMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpCreateDirectConnectGatewayAssociationProposal{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpCreateDirectConnectGatewayAssociationProposal{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "CreateDirectConnectGatewayAssociationProposal"); 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 = addOpCreateDirectConnectGatewayAssociationProposalValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opCreateDirectConnectGatewayAssociationProposal(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
}