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

package s3

import (
	"context"
	"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/smithy-go/middleware"
	"github.com/aws/smithy-go/ptr"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Returns the policy of a specified bucket. Directory buckets - For directory
// buckets, you must make requests for this API operation to the Regional endpoint.
// These endpoints support path-style requests in the format
// https://s3express-control.region_code.amazonaws.com/bucket-name .
// Virtual-hosted-style requests aren't supported. For more information, see
// Regional and Zonal endpoints (https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-express-Regions-and-Zones.html)
// in the Amazon S3 User Guide. Permissions If you are using an identity other than
// the root user of the Amazon Web Services account that owns the bucket, the
// calling identity must both have the GetBucketPolicy permissions on the
// specified bucket and belong to the bucket owner's account in order to use this
// operation. If you don't have GetBucketPolicy permissions, Amazon S3 returns a
// 403 Access Denied error. If you have the correct permissions, but you're not
// using an identity that belongs to the bucket owner's account, Amazon S3 returns
// a 405 Method Not Allowed error. To ensure that bucket owners don't
// inadvertently lock themselves out of their own buckets, the root principal in a
// bucket owner's Amazon Web Services account can perform the GetBucketPolicy ,
// PutBucketPolicy , and DeleteBucketPolicy API actions, even if their bucket
// policy explicitly denies the root principal's access. Bucket owner root
// principals can only be blocked from performing these API actions by VPC endpoint
// policies and Amazon Web Services Organizations policies.
//   - General purpose bucket permissions - The s3:GetBucketPolicy permission is
//     required in a policy. For more information about general purpose buckets bucket
//     policies, see Using Bucket Policies and User Policies (https://docs.aws.amazon.com/AmazonS3/latest/dev/using-iam-policies.html)
//     in the Amazon S3 User Guide.
//   - Directory bucket permissions - To grant access to this API operation, you
//     must have the s3express:GetBucketPolicy permission in an IAM identity-based
//     policy instead of a bucket policy. Cross-account access to this API operation
//     isn't supported. This operation can only be performed by the Amazon Web Services
//     account that owns the resource. For more information about directory bucket
//     policies and permissions, see Amazon Web Services Identity and Access
//     Management (IAM) for S3 Express One Zone (https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-express-security-iam.html)
//     in the Amazon S3 User Guide.
//
// Example bucket policies General purpose buckets example bucket policies - See
// Bucket policy examples (https://docs.aws.amazon.com/AmazonS3/latest/userguide/example-bucket-policies.html)
// in the Amazon S3 User Guide. Directory bucket example bucket policies - See
// Example bucket policies for S3 Express One Zone (https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-express-security-iam-example-bucket-policies.html)
// in the Amazon S3 User Guide. HTTP Host header syntax Directory buckets - The
// HTTP Host header syntax is s3express-control.region.amazonaws.com . The
// following action is related to GetBucketPolicy :
//   - GetObject (https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObject.html)
func (c *Client) GetBucketPolicy(ctx context.Context, params *GetBucketPolicyInput, optFns ...func(*Options)) (*GetBucketPolicyOutput, error) {
	if params == nil {
		params = &GetBucketPolicyInput{}
	}

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

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

type GetBucketPolicyInput struct {

	// The bucket name to get the bucket policy for. Directory buckets - When you use
	// this operation with a directory bucket, you must use path-style requests in the
	// format https://s3express-control.region_code.amazonaws.com/bucket-name .
	// Virtual-hosted-style requests aren't supported. Directory bucket names must be
	// unique in the chosen Availability Zone. Bucket names must also follow the format
	// bucket_base_name--az_id--x-s3 (for example,  DOC-EXAMPLE-BUCKET--usw2-az2--x-s3
	// ). For information about bucket naming restrictions, see Directory bucket
	// naming rules (https://docs.aws.amazon.com/AmazonS3/latest/userguide/directory-bucket-naming-rules.html)
	// in the Amazon S3 User Guide Access points - When you use this API operation with
	// an access point, provide the alias of the access point in place of the bucket
	// name. 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 (https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html#ErrorCodeList)
	// . Access points and Object Lambda access points are not supported by directory
	// buckets.
	//
	// 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). For directory buckets, this header
	// is not supported in this API operation. If you specify this header, the request
	// fails with the HTTP status code 501 Not Implemented .
	ExpectedBucketOwner *string

	noSmithyDocumentSerde
}

func (in *GetBucketPolicyInput) bindEndpointParams(p *EndpointParameters) {
	p.Bucket = in.Bucket
	p.UseS3ExpressControlEndpoint = ptr.Bool(true)
}

type GetBucketPolicyOutput struct {

	// The bucket policy as a JSON document.
	Policy *string

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationGetBucketPolicyMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsRestxml_serializeOpGetBucketPolicy{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsRestxml_deserializeOpGetBucketPolicy{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "GetBucketPolicy"); 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 = 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 = 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 = addSetLegacyContextSigningOptionsMiddleware(stack); err != nil {
		return err
	}
	if err = addPutBucketContextMiddleware(stack); err != nil {
		return err
	}
	if err = addOpGetBucketPolicyValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opGetBucketPolicy(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 = addGetBucketPolicyUpdateEndpoint(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
	}
	return nil
}

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

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

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