api_op_GetObject.go

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

package s3

import (
	"context"
	"errors"
	"fmt"
	"github.com/aws/aws-sdk-go-v2/aws"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/aws/signer/v4"
	internalauth "github.com/aws/aws-sdk-go-v2/internal/auth"
	"github.com/aws/aws-sdk-go-v2/internal/v4a"
	internalChecksum "github.com/aws/aws-sdk-go-v2/service/internal/checksum"
	s3cust "github.com/aws/aws-sdk-go-v2/service/s3/internal/customizations"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	smithyendpoints "github.com/aws/smithy-go/endpoints"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
	"io"
	"time"
)

// Retrieves objects from Amazon S3. To use GET , you must have READ access to the
// object. If you grant READ access to the anonymous user, you can return the
// object without using an authorization header. An Amazon S3 bucket has no
// directory hierarchy such as you would find in a typical computer file system.
// You can, however, create a logical hierarchy by using object key names that
// imply a folder structure. For example, instead of naming an object sample.jpg ,
// you can name it photos/2006/February/sample.jpg . To get an object from such a
// logical hierarchy, specify the full key name for the object in the GET
// operation. For a virtual hosted-style request example, if you have the object
// photos/2006/February/sample.jpg , specify the resource as
// /photos/2006/February/sample.jpg . For a path-style request example, if you have
// the object photos/2006/February/sample.jpg in the bucket named examplebucket ,
// specify the resource as /examplebucket/photos/2006/February/sample.jpg . For
// more information about request types, see HTTP Host Header Bucket Specification (https://docs.aws.amazon.com/AmazonS3/latest/dev/VirtualHosting.html#VirtualHostingSpecifyBucket)
// . For more information about returning the ACL of an object, see GetObjectAcl (https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObjectAcl.html)
// . If the object you are retrieving is stored in the S3 Glacier Flexible
// Retrieval or S3 Glacier Deep Archive storage class, or S3 Intelligent-Tiering
// Archive or S3 Intelligent-Tiering Deep Archive tiers, before you can retrieve
// the object you must first restore a copy using RestoreObject (https://docs.aws.amazon.com/AmazonS3/latest/API/API_RestoreObject.html)
// . Otherwise, this action returns an InvalidObjectState error. For information
// about restoring archived objects, see Restoring Archived Objects (https://docs.aws.amazon.com/AmazonS3/latest/dev/restoring-objects.html)
// . Encryption request headers, like x-amz-server-side-encryption , should not be
// sent for GET requests if your object uses server-side encryption with Key
// Management Service (KMS) keys (SSE-KMS), dual-layer server-side encryption with
// Amazon Web Services KMS keys (DSSE-KMS), or server-side encryption with Amazon
// S3 managed encryption keys (SSE-S3). If your object does use these types of
// keys, you’ll get an HTTP 400 Bad Request error. If you encrypt an object by
// using server-side encryption with customer-provided encryption keys (SSE-C) when
// you store the object in Amazon S3, then when you GET the object, you must use
// the following headers:
//   - x-amz-server-side-encryption-customer-algorithm
//   - x-amz-server-side-encryption-customer-key
//   - x-amz-server-side-encryption-customer-key-MD5
//
// For more information about SSE-C, see Server-Side Encryption (Using
// Customer-Provided Encryption Keys) (https://docs.aws.amazon.com/AmazonS3/latest/dev/ServerSideEncryptionCustomerKeys.html)
// . Assuming you have the relevant permission to read object tags, the response
// also returns the x-amz-tagging-count header that provides the count of number
// of tags associated with the object. You can use GetObjectTagging (https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObjectTagging.html)
// to retrieve the tag set associated with an object. Permissions You need the
// relevant read object (or version) permission for this operation. For more
// information, see Specifying Permissions in a Policy (https://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html)
// . If the object that you request doesn’t exist, the error that Amazon S3 returns
// depends on whether you also have the s3:ListBucket permission. If you have the
// s3:ListBucket permission on the bucket, Amazon S3 returns an HTTP status code
// 404 (Not Found) error. If you don’t have the s3:ListBucket permission, Amazon
// S3 returns an HTTP status code 403 ("access denied") error. Versioning By
// default, the GET action returns the current version of an object. To return a
// different version, use the versionId subresource.
//   - If you supply a versionId , you need the s3:GetObjectVersion permission to
//     access a specific version of an object. If you request a specific version, you
//     do not need to have the s3:GetObject permission. If you request the current
//     version without a specific version ID, only s3:GetObject permission is
//     required. s3:GetObjectVersion permission won't be required.
//   - If the current version of the object is a delete marker, Amazon S3 behaves
//     as if the object was deleted and includes x-amz-delete-marker: true in the
//     response.
//
// For more information about versioning, see PutBucketVersioning (https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutBucketVersioning.html)
// . Overriding Response Header Values There are times when you want to override
// certain response header values in a GET response. For example, you might
// override the Content-Disposition response header value in your GET request. You
// can override values for a set of response headers using the following query
// parameters. These response header values are sent only on a successful request,
// that is, when status code 200 OK is returned. The set of headers you can
// override using these parameters is a subset of the headers that Amazon S3
// accepts when you create an object. The response headers that you can override
// for the GET response are Content-Type , Content-Language , Expires ,
// Cache-Control , Content-Disposition , and Content-Encoding . To override these
// header values in the GET response, you use the following request parameters.
// You must sign the request, either using an Authorization header or a presigned
// URL, when using these parameters. They cannot be used with an unsigned
// (anonymous) request.
//   - response-content-type
//   - response-content-language
//   - response-expires
//   - response-cache-control
//   - response-content-disposition
//   - response-content-encoding
//
// Overriding Response Header Values If both of the If-Match and
// If-Unmodified-Since headers are present in the request as follows: If-Match
// condition evaluates to true , and; If-Unmodified-Since condition evaluates to
// false ; then, S3 returns 200 OK and the data requested. If both of the
// If-None-Match and If-Modified-Since headers are present in the request as
// follows: If-None-Match condition evaluates to false , and; If-Modified-Since
// condition evaluates to true ; then, S3 returns 304 Not Modified response code.
// For more information about conditional requests, see RFC 7232 (https://tools.ietf.org/html/rfc7232)
// . The following operations are related to GetObject :
//   - ListBuckets (https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListBuckets.html)
//   - GetObjectAcl (https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObjectAcl.html)
func (c *Client) GetObject(ctx context.Context, params *GetObjectInput, optFns ...func(*Options)) (*GetObjectOutput, error) {
	if params == nil {
		params = &GetObjectInput{}
	}

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

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

type GetObjectInput struct {

	// The bucket name containing the object. When using this action with an access
	// point, 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 (https://docs.aws.amazon.com/AmazonS3/latest/userguide/using-access-points.html)
	// in the Amazon S3 User Guide. When using an Object Lambda access point the
	// hostname takes the form
	// AccessPointName-AccountId.s3-object-lambda.Region.amazonaws.com. When you use
	// this action with Amazon 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 through the Amazon Web Services SDKs, you
	// provide the Outposts access point ARN in place of the bucket name. For more
	// information about S3 on Outposts ARNs, see What is S3 on Outposts? (https://docs.aws.amazon.com/AmazonS3/latest/userguide/S3onOutposts.html)
	// in the Amazon S3 User Guide.
	//
	// This member is required.
	Bucket *string

	// Key of the object to get.
	//
	// This member is required.
	Key *string

	// To retrieve the checksum, this mode must be enabled.
	ChecksumMode types.ChecksumMode

	// The account ID of the expected bucket owner. If the bucket is owned by a
	// different account, the request fails with the HTTP status code 403 Forbidden
	// (access denied).
	ExpectedBucketOwner *string

	// Return the object only if its entity tag (ETag) is the same as the one
	// specified; otherwise, return a 412 (precondition failed) error.
	IfMatch *string

	// Return the object only if it has been modified since the specified time;
	// otherwise, return a 304 (not modified) error.
	IfModifiedSince *time.Time

	// Return the object only if its entity tag (ETag) is different from the one
	// specified; otherwise, return a 304 (not modified) error.
	IfNoneMatch *string

	// Return the object only if it has not been modified since the specified time;
	// otherwise, return a 412 (precondition failed) error.
	IfUnmodifiedSince *time.Time

	// Part number of the object being read. This is a positive integer between 1 and
	// 10,000. Effectively performs a 'ranged' GET request for the part specified.
	// Useful for downloading just a part of an object.
	PartNumber int32

	// Downloads the specified range bytes of an object. For more information about
	// the HTTP Range header, see
	// https://www.rfc-editor.org/rfc/rfc9110.html#name-range (https://www.rfc-editor.org/rfc/rfc9110.html#name-range)
	// . Amazon S3 doesn't support retrieving multiple ranges of data per GET request.
	Range *string

	// Confirms that the requester knows that they will be charged for the request.
	// Bucket owners need not specify this parameter in their requests. If either the
	// source or destination Amazon S3 bucket has Requester Pays enabled, the requester
	// will pay for corresponding charges to copy the object. For information about
	// downloading objects from Requester Pays buckets, see Downloading Objects in
	// Requester Pays Buckets (https://docs.aws.amazon.com/AmazonS3/latest/dev/ObjectsinRequesterPaysBuckets.html)
	// in the Amazon S3 User Guide.
	RequestPayer types.RequestPayer

	// Sets the Cache-Control header of the response.
	ResponseCacheControl *string

	// Sets the Content-Disposition header of the response
	ResponseContentDisposition *string

	// Sets the Content-Encoding header of the response.
	ResponseContentEncoding *string

	// Sets the Content-Language header of the response.
	ResponseContentLanguage *string

	// Sets the Content-Type header of the response.
	ResponseContentType *string

	// Sets the Expires header of the response.
	ResponseExpires *time.Time

	// Specifies the algorithm to use to when decrypting the object (for example,
	// AES256).
	SSECustomerAlgorithm *string

	// Specifies the customer-provided encryption key for Amazon S3 used to encrypt
	// the data. This value is used to decrypt the object when recovering it and must
	// match the one used when storing the data. The key must be appropriate for use
	// with the algorithm specified in the
	// x-amz-server-side-encryption-customer-algorithm header.
	SSECustomerKey *string

	// Specifies the 128-bit MD5 digest of the encryption key according to RFC 1321.
	// Amazon S3 uses this header for a message integrity check to ensure that the
	// encryption key was transmitted without error.
	SSECustomerKeyMD5 *string

	// VersionId used to reference a specific version of the object.
	VersionId *string

	noSmithyDocumentSerde
}

type GetObjectOutput struct {

	// Indicates that a range of bytes was specified.
	AcceptRanges *string

	// Object data.
	Body io.ReadCloser

	// Indicates whether the object uses an S3 Bucket Key for server-side encryption
	// with Key Management Service (KMS) keys (SSE-KMS).
	BucketKeyEnabled bool

	// Specifies caching behavior along the request/reply chain.
	CacheControl *string

	// The base64-encoded, 32-bit CRC32 checksum of the object. This will only be
	// present if it was uploaded with the object. With multipart uploads, this may not
	// be a checksum value of the object. For more information about how checksums are
	// calculated with multipart uploads, see Checking object integrity (https://docs.aws.amazon.com/AmazonS3/latest/userguide/checking-object-integrity.html#large-object-checksums)
	// in the Amazon S3 User Guide.
	ChecksumCRC32 *string

	// The base64-encoded, 32-bit CRC32C checksum of the object. This will only be
	// present if it was uploaded with the object. With multipart uploads, this may not
	// be a checksum value of the object. For more information about how checksums are
	// calculated with multipart uploads, see Checking object integrity (https://docs.aws.amazon.com/AmazonS3/latest/userguide/checking-object-integrity.html#large-object-checksums)
	// in the Amazon S3 User Guide.
	ChecksumCRC32C *string

	// The base64-encoded, 160-bit SHA-1 digest of the object. This will only be
	// present if it was uploaded with the object. With multipart uploads, this may not
	// be a checksum value of the object. For more information about how checksums are
	// calculated with multipart uploads, see Checking object integrity (https://docs.aws.amazon.com/AmazonS3/latest/userguide/checking-object-integrity.html#large-object-checksums)
	// in the Amazon S3 User Guide.
	ChecksumSHA1 *string

	// The base64-encoded, 256-bit SHA-256 digest of the object. This will only be
	// present if it was uploaded with the object. With multipart uploads, this may not
	// be a checksum value of the object. For more information about how checksums are
	// calculated with multipart uploads, see Checking object integrity (https://docs.aws.amazon.com/AmazonS3/latest/userguide/checking-object-integrity.html#large-object-checksums)
	// in the Amazon S3 User Guide.
	ChecksumSHA256 *string

	// Specifies presentational information for the object.
	ContentDisposition *string

	// Specifies what content encodings have been applied to the object and thus what
	// decoding mechanisms must be applied to obtain the media-type referenced by the
	// Content-Type header field.
	ContentEncoding *string

	// The language the content is in.
	ContentLanguage *string

	// Size of the body in bytes.
	ContentLength int64

	// The portion of the object returned in the response.
	ContentRange *string

	// A standard MIME type describing the format of the object data.
	ContentType *string

	// Specifies whether the object retrieved was (true) or was not (false) a Delete
	// Marker. If false, this response header does not appear in the response.
	DeleteMarker bool

	// An entity tag (ETag) is an opaque identifier assigned by a web server to a
	// specific version of a resource found at a URL.
	ETag *string

	// If the object expiration is configured (see PUT Bucket lifecycle), the response
	// includes this header. It includes the expiry-date and rule-id key-value pairs
	// providing object expiration information. The value of the rule-id is
	// URL-encoded.
	Expiration *string

	// The date and time at which the object is no longer cacheable.
	Expires *time.Time

	// Creation date of the object.
	LastModified *time.Time

	// A map of metadata to store with the object in S3.
	//
	// Map keys will be normalized to lower-case.
	Metadata map[string]string

	// This is set to the number of metadata entries not returned in x-amz-meta
	// headers. This can happen if you create metadata using an API like SOAP that
	// supports more flexible metadata than the REST API. For example, using SOAP, you
	// can create metadata whose values are not legal HTTP headers.
	MissingMeta int32

	// Indicates whether this object has an active legal hold. This field is only
	// returned if you have permission to view an object's legal hold status.
	ObjectLockLegalHoldStatus types.ObjectLockLegalHoldStatus

	// The Object Lock mode currently in place for this object.
	ObjectLockMode types.ObjectLockMode

	// The date and time when this object's Object Lock will expire.
	ObjectLockRetainUntilDate *time.Time

	// The count of parts this object has. This value is only returned if you specify
	// partNumber in your request and the object was uploaded as a multipart upload.
	PartsCount int32

	// Amazon S3 can return this if your request involves a bucket that is either a
	// source or destination in a replication rule.
	ReplicationStatus types.ReplicationStatus

	// If present, indicates that the requester was successfully charged for the
	// request.
	RequestCharged types.RequestCharged

	// Provides information about object restoration action and expiration time of the
	// restored object copy.
	Restore *string

	// If server-side encryption with a customer-provided encryption key was
	// requested, the response will include this header confirming the encryption
	// algorithm used.
	SSECustomerAlgorithm *string

	// If server-side encryption with a customer-provided encryption key was
	// requested, the response will include this header to provide round-trip message
	// integrity verification of the customer-provided encryption key.
	SSECustomerKeyMD5 *string

	// If present, specifies the ID of the Key Management Service (KMS) symmetric
	// encryption customer managed key that was used for the object.
	SSEKMSKeyId *string

	// The server-side encryption algorithm used when storing this object in Amazon S3
	// (for example, AES256 , aws:kms , aws:kms:dsse ).
	ServerSideEncryption types.ServerSideEncryption

	// Provides storage class information of the object. Amazon S3 returns this header
	// for all objects except for S3 Standard storage class objects.
	StorageClass types.StorageClass

	// The number of tags, if any, on the object.
	TagCount int32

	// Version of the object.
	VersionId *string

	// If the bucket is configured as a website, redirects requests for this object to
	// another object in the same bucket or to an external URL. Amazon S3 stores the
	// value of this header in the object metadata.
	WebsiteRedirectLocation *string

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationGetObjectMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsRestxml_serializeOpGetObject{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsRestxml_deserializeOpGetObject{}, middleware.After)
	if err != nil {
		return err
	}
	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = awsmiddleware.AddClientRequestIDMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddComputeContentLengthMiddleware(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = v4.AddComputePayloadSHA256Middleware(stack); err != nil {
		return err
	}
	if err = addRetryMiddlewares(stack, options); err != nil {
		return err
	}
	if err = addHTTPSignerV4Middleware(stack, options); err != nil {
		return err
	}
	if err = awsmiddleware.AddRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = awsmiddleware.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 = swapWithCustomHTTPSignerMiddleware(stack, options); err != nil {
		return err
	}
	if err = addGetObjectResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addOpGetObjectValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opGetObject(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = addMetadataRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = awsmiddleware.AddRecursionDetection(stack); err != nil {
		return err
	}
	if err = addGetObjectOutputChecksumMiddlewares(stack, options); err != nil {
		return err
	}
	if err = addGetObjectUpdateEndpoint(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 = addendpointDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	if err = addSerializeImmutableHostnameBucketMiddleware(stack, options); err != nil {
		return err
	}
	return nil
}

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

func newServiceMetadataMiddleware_opGetObject(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "s3",
		OperationName: "GetObject",
	}
}

// getGetObjectRequestValidationModeMember gets the request checksum validation
// mode provided as input.
func getGetObjectRequestValidationModeMember(input interface{}) (string, bool) {
	in := input.(*GetObjectInput)
	if len(in.ChecksumMode) == 0 {
		return "", false
	}
	return string(in.ChecksumMode), true
}

func addGetObjectOutputChecksumMiddlewares(stack *middleware.Stack, options Options) error {
	return internalChecksum.AddOutputMiddleware(stack, internalChecksum.OutputMiddlewareOptions{
		GetValidationMode:             getGetObjectRequestValidationModeMember,
		ValidationAlgorithms:          []string{"CRC32", "CRC32C", "SHA256", "SHA1"},
		IgnoreMultipartValidation:     true,
		LogValidationSkipped:          true,
		LogMultipartValidationSkipped: true,
	})
}

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

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

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

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

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

type opGetObjectResolveEndpointMiddleware struct {
	EndpointResolver EndpointResolverV2
	BuiltInResolver  builtInParameterResolver
}

func (*opGetObjectResolveEndpointMiddleware) ID() string {
	return "ResolveEndpointV2"
}

func (m *opGetObjectResolveEndpointMiddleware) HandleSerialize(ctx context.Context, in middleware.SerializeInput, next middleware.SerializeHandler) (
	out middleware.SerializeOutput, metadata middleware.Metadata, err error,
) {
	if awsmiddleware.GetRequiresLegacyEndpoints(ctx) {
		return next.HandleSerialize(ctx, in)
	}

	req, ok := in.Request.(*smithyhttp.Request)
	if !ok {
		return out, metadata, fmt.Errorf("unknown transport type %T", in.Request)
	}

	input, ok := in.Parameters.(*GetObjectInput)
	if !ok {
		return out, metadata, fmt.Errorf("unknown transport type %T", in.Request)
	}

	if m.EndpointResolver == nil {
		return out, metadata, fmt.Errorf("expected endpoint resolver to not be nil")
	}

	params := EndpointParameters{}

	m.BuiltInResolver.ResolveBuiltIns(&params)

	params.Bucket = input.Bucket

	var resolvedEndpoint smithyendpoints.Endpoint
	resolvedEndpoint, err = m.EndpointResolver.ResolveEndpoint(ctx, params)
	if err != nil {
		return out, metadata, fmt.Errorf("failed to resolve service endpoint, %w", err)
	}

	req.URL = &resolvedEndpoint.URI

	for k := range resolvedEndpoint.Headers {
		req.Header.Set(
			k,
			resolvedEndpoint.Headers.Get(k),
		)
	}

	authSchemes, err := internalauth.GetAuthenticationSchemes(&resolvedEndpoint.Properties)
	if err != nil {
		var nfe *internalauth.NoAuthenticationSchemesFoundError
		if errors.As(err, &nfe) {
			// if no auth scheme is found, default to sigv4
			signingName := "s3"
			signingRegion := m.BuiltInResolver.(*builtInResolver).Region
			ctx = awsmiddleware.SetSigningName(ctx, signingName)
			ctx = awsmiddleware.SetSigningRegion(ctx, signingRegion)
			ctx = s3cust.SetSignerVersion(ctx, internalauth.SigV4)
		}
		var ue *internalauth.UnSupportedAuthenticationSchemeSpecifiedError
		if errors.As(err, &ue) {
			return out, metadata, fmt.Errorf(
				"This operation requests signer version(s) %v but the client only supports %v",
				ue.UnsupportedSchemes,
				internalauth.SupportedSchemes,
			)
		}
	}

	for _, authScheme := range authSchemes {
		switch authScheme.(type) {
		case *internalauth.AuthenticationSchemeV4:
			v4Scheme, _ := authScheme.(*internalauth.AuthenticationSchemeV4)
			var signingName, signingRegion string
			if v4Scheme.SigningName == nil {
				signingName = "s3"
			} else {
				signingName = *v4Scheme.SigningName
			}
			if v4Scheme.SigningRegion == nil {
				signingRegion = m.BuiltInResolver.(*builtInResolver).Region
			} else {
				signingRegion = *v4Scheme.SigningRegion
			}
			if v4Scheme.DisableDoubleEncoding != nil {
				// The signer sets an equivalent value at client initialization time.
				// Setting this context value will cause the signer to extract it
				// and override the value set at client initialization time.
				ctx = internalauth.SetDisableDoubleEncoding(ctx, *v4Scheme.DisableDoubleEncoding)
			}
			ctx = awsmiddleware.SetSigningName(ctx, signingName)
			ctx = awsmiddleware.SetSigningRegion(ctx, signingRegion)
			ctx = s3cust.SetSignerVersion(ctx, v4Scheme.Name)
			break
		case *internalauth.AuthenticationSchemeV4A:
			v4aScheme, _ := authScheme.(*internalauth.AuthenticationSchemeV4A)
			if v4aScheme.SigningName == nil {
				v4aScheme.SigningName = aws.String("s3")
			}
			if v4aScheme.DisableDoubleEncoding != nil {
				// The signer sets an equivalent value at client initialization time.
				// Setting this context value will cause the signer to extract it
				// and override the value set at client initialization time.
				ctx = internalauth.SetDisableDoubleEncoding(ctx, *v4aScheme.DisableDoubleEncoding)
			}
			ctx = awsmiddleware.SetSigningName(ctx, *v4aScheme.SigningName)
			ctx = awsmiddleware.SetSigningRegion(ctx, v4aScheme.SigningRegionSet[0])
			ctx = s3cust.SetSignerVersion(ctx, v4a.Version)
			break
		case *internalauth.AuthenticationSchemeNone:
			break
		}
	}

	return next.HandleSerialize(ctx, in)
}

func addGetObjectResolveEndpointMiddleware(stack *middleware.Stack, options Options) error {
	return stack.Serialize.Insert(&opGetObjectResolveEndpointMiddleware{
		EndpointResolver: options.EndpointResolverV2,
		BuiltInResolver: &builtInResolver{
			Region:                         options.Region,
			UseFIPS:                        options.EndpointOptions.UseFIPSEndpoint,
			UseDualStack:                   options.EndpointOptions.UseDualStackEndpoint,
			Endpoint:                       options.BaseEndpoint,
			ForcePathStyle:                 options.UsePathStyle,
			Accelerate:                     options.UseAccelerate,
			DisableMultiRegionAccessPoints: options.DisableMultiRegionAccessPoints,
			UseArnRegion:                   options.UseARNRegion,
		},
	}, "ResolveEndpoint", middleware.After)
}