// Code generated by smithy-go-codegen DO NOT EDIT.

package s3

import (
	"context"
	"errors"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/aws/signer/v4"
	s3cust "github.com/aws/aws-sdk-go-v2/service/s3/internal/customizations"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go/middleware"
	smithytime "github.com/aws/smithy-go/time"
	smithyhttp "github.com/aws/smithy-go/transport/http"
	smithywaiter "github.com/aws/smithy-go/waiter"
	"time"
)

// You can use this operation to determine if a bucket exists and if you have
// permission to access it. The action returns a 200 OK HTTP status code if the
// bucket exists and you have permission to access it. You can make a HeadBucket
// call on any bucket name to any Region in the partition, and regardless of the
// permissions on the bucket, you will receive a response header with the correct
// bucket location so that you can then make a proper, signed request to the
// appropriate Regional endpoint.
//
// If the bucket doesn't exist or you don't have permission to access it, the HEAD
// request returns a generic 400 Bad Request , 403 Forbidden , or 404 Not Found
// HTTP status code. A message body isn't included, so you can't determine the
// exception beyond these HTTP response codes.
//
// Authentication and authorization  General purpose buckets - Request to public
// buckets that grant the s3:ListBucket permission publicly do not need to be
// signed. All other HeadBucket requests must be authenticated and signed by using
// IAM credentials (access key ID and secret access key for the IAM identities).
// All headers with the x-amz- prefix, including x-amz-copy-source , must be
// signed. For more information, see [REST Authentication].
//
// Directory buckets - You must use IAM credentials to authenticate and authorize
// your access to the HeadBucket API operation, instead of using the temporary
// security credentials through the CreateSession API operation.
//
// Amazon Web Services CLI or SDKs handles authentication and authorization on
// your behalf.
//
// Permissions
//
//   - General purpose bucket permissions - To use this operation, you must have
//     permissions to perform the s3:ListBucket action. The bucket owner has this
//     permission by default and can grant this permission to others. For more
//     information about permissions, see [Managing access permissions to your Amazon S3 resources]in the Amazon S3 User Guide.
//
//   - Directory bucket permissions - You must have the s3express:CreateSession
//     permission in the Action element of a policy. By default, the session is in
//     the ReadWrite mode. If you want to restrict the access, you can explicitly set
//     the s3express:SessionMode condition key to ReadOnly on the bucket.
//
// For more information about example bucket policies, see [Example bucket policies for S3 Express One Zone]and [Amazon Web Services Identity and Access Management (IAM) identity-based policies for S3 Express One Zone]in the Amazon S3
//
//	User Guide.
//
// HTTP Host header syntax  Directory buckets - The HTTP Host header syntax is
// Bucket-name.s3express-zone-id.region-code.amazonaws.com .
//
// You must make requests for this API operation to the Zonal endpoint. These
// endpoints support virtual-hosted-style requests in the format
// https://bucket-name.s3express-zone-id.region-code.amazonaws.com . Path-style
// requests are not supported. For more information about endpoints in Availability
// Zones, see [Regional and Zonal endpoints for directory buckets in Availability Zones]in the Amazon S3 User Guide. For more information about endpoints in
// Local Zones, see [Concepts for directory buckets in Local Zones]in the Amazon S3 User Guide.
//
// You must URL encode any signed header values that contain spaces. For example,
// if your header value is my file.txt , containing two spaces after my , you must
// URL encode this value to my%20%20file.txt .
//
// [Amazon Web Services Identity and Access Management (IAM) identity-based policies for S3 Express One Zone]: https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-express-security-iam-identity-policies.html
// [Concepts for directory buckets in Local Zones]: https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-lzs-for-directory-buckets.html
// [REST Authentication]: https://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html
// [Example bucket policies for S3 Express One Zone]: https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-express-security-iam-example-bucket-policies.html
// [Managing access permissions to your Amazon S3 resources]: https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-access-control.html
// [Regional and Zonal endpoints for directory buckets in Availability Zones]: https://docs.aws.amazon.com/AmazonS3/latest/userguide/endpoint-directory-buckets-AZ.html
func (c *Client) HeadBucket(ctx context.Context, params *HeadBucketInput, optFns ...func(*Options)) (*HeadBucketOutput, error) {
	if params == nil {
		params = &HeadBucketInput{}
	}

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

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

type HeadBucketInput struct {

	// The bucket name.
	//
	// Directory buckets - When you use this operation with a directory bucket, you
	// must use virtual-hosted-style requests in the format
	// Bucket-name.s3express-zone-id.region-code.amazonaws.com . Path-style requests
	// are not supported. Directory bucket names must be unique in the chosen Zone
	// (Availability Zone or Local Zone). Bucket names must follow the format
	// bucket-base-name--zone-id--x-s3 (for example,
	// amzn-s3-demo-bucket--usw2-az1--x-s3 ). For information about bucket naming
	// restrictions, see [Directory bucket naming rules]in the Amazon S3 User Guide.
	//
	// Access points - When you use this action with an access point for general
	// purpose buckets, you must provide the alias of the access point in place of the
	// bucket name or specify the access point ARN. When you use this action with an
	// access point for directory buckets, you must provide the access point name in
	// place of the bucket name. When using the access point ARN, you must direct
	// requests to the access point hostname. The access point hostname takes the form
	// AccessPointName-AccountId.s3-accesspoint.Region.amazonaws.com. When using this
	// action with an access point through the Amazon Web Services SDKs, you provide
	// the access point ARN in place of the bucket name. For more information about
	// access point ARNs, see [Using access points]in the Amazon S3 User Guide.
	//
	// Object Lambda access points - When you use this API operation with an Object
	// Lambda access point, provide the alias of the Object Lambda access point in
	// place of the bucket name. If the Object Lambda access point alias in a request
	// is not valid, the error code InvalidAccessPointAliasError is returned. For more
	// information about InvalidAccessPointAliasError , see [List of Error Codes].
	//
	// Object Lambda access points are not supported by directory buckets.
	//
	// S3 on Outposts - When you use this action with S3 on Outposts, you must direct
	// requests to the S3 on Outposts hostname. The S3 on Outposts hostname takes the
	// form AccessPointName-AccountId.outpostID.s3-outposts.Region.amazonaws.com . When
	// you use this action with S3 on Outposts, the destination bucket must be the
	// Outposts access point ARN or the access point alias. For more information about
	// S3 on Outposts, see [What is S3 on Outposts?]in the Amazon S3 User Guide.
	//
	// [Directory bucket naming rules]: https://docs.aws.amazon.com/AmazonS3/latest/userguide/directory-bucket-naming-rules.html
	// [What is S3 on Outposts?]: https://docs.aws.amazon.com/AmazonS3/latest/userguide/S3onOutposts.html
	// [Using access points]: https://docs.aws.amazon.com/AmazonS3/latest/userguide/using-access-points.html
	// [List of Error Codes]: https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html#ErrorCodeList
	//
	// This member is required.
	Bucket *string

	// The account ID of the expected bucket owner. If the account ID that you provide
	// does not match the actual owner of the bucket, the request fails with the HTTP
	// status code 403 Forbidden (access denied).
	ExpectedBucketOwner *string

	noSmithyDocumentSerde
}

func (in *HeadBucketInput) bindEndpointParams(p *EndpointParameters) {

	p.Bucket = in.Bucket

}

type HeadBucketOutput struct {

	// Indicates whether the bucket name used in the request is an access point alias.
	//
	// For directory buckets, the value of this field is false .
	AccessPointAlias *bool

	// The Amazon Resource Name (ARN) of the S3 bucket. ARNs uniquely identify Amazon
	// Web Services resources across all of Amazon Web Services.
	//
	// This parameter is only supported for S3 directory buckets. For more
	// information, see [Using tags with directory buckets].
	//
	// [Using tags with directory buckets]: https://docs.aws.amazon.com/AmazonS3/latest/userguide/directory-buckets-tagging.html
	BucketArn *string

	// The name of the location where the bucket will be created.
	//
	// For directory buckets, the Zone ID of the Availability Zone or the Local Zone
	// where the bucket is created. An example Zone ID value for an Availability Zone
	// is usw2-az1 .
	//
	// This functionality is only supported by directory buckets.
	BucketLocationName *string

	// The type of location where the bucket is created.
	//
	// This functionality is only supported by directory buckets.
	BucketLocationType types.LocationType

	// The Region that the bucket is located.
	BucketRegion *string

	// Metadata pertaining to the operation's result.
	ResultMetadata middleware.Metadata

	noSmithyDocumentSerde
}

func (c *Client) addOperationHeadBucketMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsRestxml_serializeOpHeadBucket{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsRestxml_deserializeOpHeadBucket{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "HeadBucket"); 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 = addSpanRetryLoop(stack, options); 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 = addPutBucketContextMiddleware(stack); err != nil {
		return err
	}
	if err = addTimeOffsetBuild(stack, c); err != nil {
		return err
	}
	if err = addUserAgentRetryMode(stack, options); err != nil {
		return err
	}
	if err = addIsExpressUserAgent(stack); err != nil {
		return err
	}
	if err = addCredentialSource(stack, options); err != nil {
		return err
	}
	if err = addOpHeadBucketValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opHeadBucket(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = addMetadataRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addRecursionDetection(stack); err != nil {
		return err
	}
	if err = addHeadBucketUpdateEndpoint(stack, options); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = v4.AddContentSHA256HeaderMiddleware(stack); err != nil {
		return err
	}
	if err = disableAcceptEncodingGzip(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	if err = addSerializeImmutableHostnameBucketMiddleware(stack, options); err != nil {
		return err
	}
	if err = addInterceptBeforeRetryLoop(stack, options); err != nil {
		return err
	}
	if err = addInterceptAttempt(stack, options); err != nil {
		return err
	}
	if err = addInterceptors(stack, options); err != nil {
		return err
	}
	return nil
}

// BucketExistsWaiterOptions are waiter options for BucketExistsWaiter
type BucketExistsWaiterOptions struct {

	// Set of options to modify how an operation is invoked. These apply to all
	// operations invoked for this client. Use functional options on operation call to
	// modify this list for per operation behavior.
	//
	// Passing options here is functionally equivalent to passing values to this
	// config's ClientOptions field that extend the inner client's APIOptions directly.
	APIOptions []func(*middleware.Stack) error

	// Functional options to be passed to all operations invoked by this client.
	//
	// Function values that modify the inner APIOptions are applied after the waiter
	// config's own APIOptions modifiers.
	ClientOptions []func(*Options)

	// MinDelay is the minimum amount of time to delay between retries. If unset,
	// BucketExistsWaiter will use default minimum delay of 5 seconds. Note that
	// MinDelay must resolve to a value lesser than or equal to the MaxDelay.
	MinDelay time.Duration

	// MaxDelay is the maximum amount of time to delay between retries. If unset or
	// set to zero, BucketExistsWaiter will use default max delay of 120 seconds. Note
	// that MaxDelay must resolve to value greater than or equal to the MinDelay.
	MaxDelay time.Duration

	// LogWaitAttempts is used to enable logging for waiter retry attempts
	LogWaitAttempts bool

	// Retryable is function that can be used to override the service defined
	// waiter-behavior based on operation output, or returned error. This function is
	// used by the waiter to decide if a state is retryable or a terminal state.
	//
	// By default service-modeled logic will populate this option. This option can
	// thus be used to define a custom waiter state with fall-back to service-modeled
	// waiter state mutators.The function returns an error in case of a failure state.
	// In case of retry state, this function returns a bool value of true and nil
	// error, while in case of success it returns a bool value of false and nil error.
	Retryable func(context.Context, *HeadBucketInput, *HeadBucketOutput, error) (bool, error)
}

// BucketExistsWaiter defines the waiters for BucketExists
type BucketExistsWaiter struct {
	client HeadBucketAPIClient

	options BucketExistsWaiterOptions
}

// NewBucketExistsWaiter constructs a BucketExistsWaiter.
func NewBucketExistsWaiter(client HeadBucketAPIClient, optFns ...func(*BucketExistsWaiterOptions)) *BucketExistsWaiter {
	options := BucketExistsWaiterOptions{}
	options.MinDelay = 5 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = bucketExistsStateRetryable

	for _, fn := range optFns {
		fn(&options)
	}
	return &BucketExistsWaiter{
		client:  client,
		options: options,
	}
}

// Wait calls the waiter function for BucketExists waiter. The maxWaitDur is the
// maximum wait duration the waiter will wait. The maxWaitDur is required and must
// be greater than zero.
func (w *BucketExistsWaiter) Wait(ctx context.Context, params *HeadBucketInput, maxWaitDur time.Duration, optFns ...func(*BucketExistsWaiterOptions)) error {
	_, err := w.WaitForOutput(ctx, params, maxWaitDur, optFns...)
	return err
}

// WaitForOutput calls the waiter function for BucketExists waiter and returns the
// output of the successful operation. The maxWaitDur is the maximum wait duration
// the waiter will wait. The maxWaitDur is required and must be greater than zero.
func (w *BucketExistsWaiter) WaitForOutput(ctx context.Context, params *HeadBucketInput, maxWaitDur time.Duration, optFns ...func(*BucketExistsWaiterOptions)) (*HeadBucketOutput, error) {
	if maxWaitDur <= 0 {
		return nil, fmt.Errorf("maximum wait time for waiter must be greater than zero")
	}

	options := w.options
	for _, fn := range optFns {
		fn(&options)
	}

	if options.MaxDelay <= 0 {
		options.MaxDelay = 120 * time.Second
	}

	if options.MinDelay > options.MaxDelay {
		return nil, fmt.Errorf("minimum waiter delay %v must be lesser than or equal to maximum waiter delay of %v.", options.MinDelay, options.MaxDelay)
	}

	ctx, cancelFn := context.WithTimeout(ctx, maxWaitDur)
	defer cancelFn()

	logger := smithywaiter.Logger{}
	remainingTime := maxWaitDur

	var attempt int64
	for {

		attempt++
		apiOptions := options.APIOptions
		start := time.Now()

		if options.LogWaitAttempts {
			logger.Attempt = attempt
			apiOptions = append([]func(*middleware.Stack) error{}, options.APIOptions...)
			apiOptions = append(apiOptions, logger.AddLogger)
		}

		out, err := w.client.HeadBucket(ctx, params, func(o *Options) {
			baseOpts := []func(*Options){
				addIsWaiterUserAgent,
			}
			o.APIOptions = append(o.APIOptions, apiOptions...)
			for _, opt := range baseOpts {
				opt(o)
			}
			for _, opt := range options.ClientOptions {
				opt(o)
			}
		})

		retryable, err := options.Retryable(ctx, params, out, err)
		if err != nil {
			return nil, err
		}
		if !retryable {
			return out, nil
		}

		remainingTime -= time.Since(start)
		if remainingTime < options.MinDelay || remainingTime <= 0 {
			break
		}

		// compute exponential backoff between waiter retries
		delay, err := smithywaiter.ComputeDelay(
			attempt, options.MinDelay, options.MaxDelay, remainingTime,
		)
		if err != nil {
			return nil, fmt.Errorf("error computing waiter delay, %w", err)
		}

		remainingTime -= delay
		// sleep for the delay amount before invoking a request
		if err := smithytime.SleepWithContext(ctx, delay); err != nil {
			return nil, fmt.Errorf("request cancelled while waiting, %w", err)
		}
	}
	return nil, fmt.Errorf("exceeded max wait time for BucketExists waiter")
}

func bucketExistsStateRetryable(ctx context.Context, input *HeadBucketInput, output *HeadBucketOutput, err error) (bool, error) {

	if err == nil {
		return false, nil
	}

	if err != nil {
		var errorType *types.NotFound
		if errors.As(err, &errorType) {
			return true, nil
		}
	}

	if err != nil {
		return false, err
	}
	return true, nil
}

// BucketNotExistsWaiterOptions are waiter options for BucketNotExistsWaiter
type BucketNotExistsWaiterOptions struct {

	// Set of options to modify how an operation is invoked. These apply to all
	// operations invoked for this client. Use functional options on operation call to
	// modify this list for per operation behavior.
	//
	// Passing options here is functionally equivalent to passing values to this
	// config's ClientOptions field that extend the inner client's APIOptions directly.
	APIOptions []func(*middleware.Stack) error

	// Functional options to be passed to all operations invoked by this client.
	//
	// Function values that modify the inner APIOptions are applied after the waiter
	// config's own APIOptions modifiers.
	ClientOptions []func(*Options)

	// MinDelay is the minimum amount of time to delay between retries. If unset,
	// BucketNotExistsWaiter will use default minimum delay of 5 seconds. Note that
	// MinDelay must resolve to a value lesser than or equal to the MaxDelay.
	MinDelay time.Duration

	// MaxDelay is the maximum amount of time to delay between retries. If unset or
	// set to zero, BucketNotExistsWaiter will use default max delay of 120 seconds.
	// Note that MaxDelay must resolve to value greater than or equal to the MinDelay.
	MaxDelay time.Duration

	// LogWaitAttempts is used to enable logging for waiter retry attempts
	LogWaitAttempts bool

	// Retryable is function that can be used to override the service defined
	// waiter-behavior based on operation output, or returned error. This function is
	// used by the waiter to decide if a state is retryable or a terminal state.
	//
	// By default service-modeled logic will populate this option. This option can
	// thus be used to define a custom waiter state with fall-back to service-modeled
	// waiter state mutators.The function returns an error in case of a failure state.
	// In case of retry state, this function returns a bool value of true and nil
	// error, while in case of success it returns a bool value of false and nil error.
	Retryable func(context.Context, *HeadBucketInput, *HeadBucketOutput, error) (bool, error)
}

// BucketNotExistsWaiter defines the waiters for BucketNotExists
type BucketNotExistsWaiter struct {
	client HeadBucketAPIClient

	options BucketNotExistsWaiterOptions
}

// NewBucketNotExistsWaiter constructs a BucketNotExistsWaiter.
func NewBucketNotExistsWaiter(client HeadBucketAPIClient, optFns ...func(*BucketNotExistsWaiterOptions)) *BucketNotExistsWaiter {
	options := BucketNotExistsWaiterOptions{}
	options.MinDelay = 5 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = bucketNotExistsStateRetryable

	for _, fn := range optFns {
		fn(&options)
	}
	return &BucketNotExistsWaiter{
		client:  client,
		options: options,
	}
}

// Wait calls the waiter function for BucketNotExists waiter. The maxWaitDur is
// the maximum wait duration the waiter will wait. The maxWaitDur is required and
// must be greater than zero.
func (w *BucketNotExistsWaiter) Wait(ctx context.Context, params *HeadBucketInput, maxWaitDur time.Duration, optFns ...func(*BucketNotExistsWaiterOptions)) error {
	_, err := w.WaitForOutput(ctx, params, maxWaitDur, optFns...)
	return err
}

// WaitForOutput calls the waiter function for BucketNotExists waiter and returns
// the output of the successful operation. The maxWaitDur is the maximum wait
// duration the waiter will wait. The maxWaitDur is required and must be greater
// than zero.
func (w *BucketNotExistsWaiter) WaitForOutput(ctx context.Context, params *HeadBucketInput, maxWaitDur time.Duration, optFns ...func(*BucketNotExistsWaiterOptions)) (*HeadBucketOutput, error) {
	if maxWaitDur <= 0 {
		return nil, fmt.Errorf("maximum wait time for waiter must be greater than zero")
	}

	options := w.options
	for _, fn := range optFns {
		fn(&options)
	}

	if options.MaxDelay <= 0 {
		options.MaxDelay = 120 * time.Second
	}

	if options.MinDelay > options.MaxDelay {
		return nil, fmt.Errorf("minimum waiter delay %v must be lesser than or equal to maximum waiter delay of %v.", options.MinDelay, options.MaxDelay)
	}

	ctx, cancelFn := context.WithTimeout(ctx, maxWaitDur)
	defer cancelFn()

	logger := smithywaiter.Logger{}
	remainingTime := maxWaitDur

	var attempt int64
	for {

		attempt++
		apiOptions := options.APIOptions
		start := time.Now()

		if options.LogWaitAttempts {
			logger.Attempt = attempt
			apiOptions = append([]func(*middleware.Stack) error{}, options.APIOptions...)
			apiOptions = append(apiOptions, logger.AddLogger)
		}

		out, err := w.client.HeadBucket(ctx, params, func(o *Options) {
			baseOpts := []func(*Options){
				addIsWaiterUserAgent,
			}
			o.APIOptions = append(o.APIOptions, apiOptions...)
			for _, opt := range baseOpts {
				opt(o)
			}
			for _, opt := range options.ClientOptions {
				opt(o)
			}
		})

		retryable, err := options.Retryable(ctx, params, out, err)
		if err != nil {
			return nil, err
		}
		if !retryable {
			return out, nil
		}

		remainingTime -= time.Since(start)
		if remainingTime < options.MinDelay || remainingTime <= 0 {
			break
		}

		// compute exponential backoff between waiter retries
		delay, err := smithywaiter.ComputeDelay(
			attempt, options.MinDelay, options.MaxDelay, remainingTime,
		)
		if err != nil {
			return nil, fmt.Errorf("error computing waiter delay, %w", err)
		}

		remainingTime -= delay
		// sleep for the delay amount before invoking a request
		if err := smithytime.SleepWithContext(ctx, delay); err != nil {
			return nil, fmt.Errorf("request cancelled while waiting, %w", err)
		}
	}
	return nil, fmt.Errorf("exceeded max wait time for BucketNotExists waiter")
}

func bucketNotExistsStateRetryable(ctx context.Context, input *HeadBucketInput, output *HeadBucketOutput, err error) (bool, error) {

	if err != nil {
		var errorType *types.NotFound
		if errors.As(err, &errorType) {
			return false, nil
		}
	}

	if err != nil {
		return false, err
	}
	return true, nil
}

func (v *HeadBucketInput) bucket() (string, bool) {
	if v.Bucket == nil {
		return "", false
	}
	return *v.Bucket, true
}

// HeadBucketAPIClient is a client that implements the HeadBucket operation.
type HeadBucketAPIClient interface {
	HeadBucket(context.Context, *HeadBucketInput, ...func(*Options)) (*HeadBucketOutput, error)
}

var _ HeadBucketAPIClient = (*Client)(nil)

func newServiceMetadataMiddleware_opHeadBucket(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		OperationName: "HeadBucket",
	}
}

// getHeadBucketBucketMember returns a pointer to string denoting a provided
// bucket member valueand a boolean indicating if the input has a modeled bucket
// name,
func getHeadBucketBucketMember(input interface{}) (*string, bool) {
	in := input.(*HeadBucketInput)
	if in.Bucket == nil {
		return nil, false
	}
	return in.Bucket, true
}
func addHeadBucketUpdateEndpoint(stack *middleware.Stack, options Options) error {
	return s3cust.UpdateEndpoint(stack, s3cust.UpdateEndpointOptions{
		Accessor: s3cust.UpdateEndpointParameterAccessor{
			GetBucketFromInput: getHeadBucketBucketMember,
		},
		UsePathStyle:                   options.UsePathStyle,
		UseAccelerate:                  options.UseAccelerate,
		SupportsAccelerate:             true,
		TargetS3ObjectLambda:           false,
		EndpointResolver:               options.EndpointResolver,
		EndpointResolverOptions:        options.EndpointOptions,
		UseARNRegion:                   options.UseARNRegion,
		DisableMultiRegionAccessPoints: options.DisableMultiRegionAccessPoints,
	})
}

// PresignHeadBucket is used to generate a presigned HTTP Request which contains
// presigned URL, signed headers and HTTP method used.
func (c *PresignClient) PresignHeadBucket(ctx context.Context, params *HeadBucketInput, optFns ...func(*PresignOptions)) (*v4.PresignedHTTPRequest, error) {
	if params == nil {
		params = &HeadBucketInput{}
	}
	options := c.options.copy()
	for _, fn := range optFns {
		fn(&options)
	}
	clientOptFns := append(options.ClientOptions, withNopHTTPClientAPIOption)

	result, _, err := c.client.invokeOperation(ctx, "HeadBucket", params, clientOptFns,
		c.client.addOperationHeadBucketMiddlewares,
		presignConverter(options).convertToPresignMiddleware,
		addHeadBucketPayloadAsUnsigned,
	)
	if err != nil {
		return nil, err
	}

	out := result.(*v4.PresignedHTTPRequest)
	return out, nil
}

func addHeadBucketPayloadAsUnsigned(stack *middleware.Stack, options Options) error {
	v4.RemoveContentSHA256HeaderMiddleware(stack)
	v4.RemoveComputePayloadSHA256Middleware(stack)
	return v4.AddUnsignedPayloadMiddleware(stack)
}