api_op_GetBucketCors.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"
	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"
)

// Returns the Cross-Origin Resource Sharing (CORS) configuration information set
// for the bucket. To use this operation, you must have permission to perform the
// s3:GetBucketCORS action. By default, the bucket owner has this permission and
// can grant it to others. To use this API operation against an access point,
// provide the alias of the access point in place of the bucket name. To use this
// API operation against 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 (https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html#ErrorCodeList)
// . For more information about CORS, see Enabling Cross-Origin Resource Sharing (https://docs.aws.amazon.com/AmazonS3/latest/dev/cors.html)
// . The following operations are related to GetBucketCors :
//   - PutBucketCors (https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutBucketCors.html)
//   - DeleteBucketCors (https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteBucketCors.html)
func (c *Client) GetBucketCors(ctx context.Context, params *GetBucketCorsInput, optFns ...func(*Options)) (*GetBucketCorsOutput, error) {
	if params == nil {
		params = &GetBucketCorsInput{}
	}

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

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

type GetBucketCorsInput struct {

	// The bucket name for which to get the cors configuration. To use this API
	// operation against an access point, provide the alias of the access point in
	// place of the bucket name. To use this API operation against 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 (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 bucket is owned by a
	// different account, the request fails with the HTTP status code 403 Forbidden
	// (access denied).
	ExpectedBucketOwner *string

	noSmithyDocumentSerde
}

type GetBucketCorsOutput struct {

	// A set of origins and methods (cross-origin access that you want to allow). You
	// can add up to 100 rules to the configuration.
	CORSRules []types.CORSRule

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationGetBucketCorsMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsRestxml_serializeOpGetBucketCors{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsRestxml_deserializeOpGetBucketCors{}, 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 = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = swapWithCustomHTTPSignerMiddleware(stack, options); err != nil {
		return err
	}
	if err = addGetBucketCorsResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addOpGetBucketCorsValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opGetBucketCors(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 = addGetBucketCorsUpdateEndpoint(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 *GetBucketCorsInput) bucket() (string, bool) {
	if v.Bucket == nil {
		return "", false
	}
	return *v.Bucket, true
}

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

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

type opGetBucketCorsResolveEndpointMiddleware struct {
	EndpointResolver EndpointResolverV2
	BuiltInResolver  builtInParameterResolver
}

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

func (m *opGetBucketCorsResolveEndpointMiddleware) 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.(*GetBucketCorsInput)
	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 addGetBucketCorsResolveEndpointMiddleware(stack *middleware.Stack, options Options) error {
	return stack.Serialize.Insert(&opGetBucketCorsResolveEndpointMiddleware{
		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)
}