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

package s3control

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/aws/signer/v4"
	s3controlcust "github.com/aws/aws-sdk-go-v2/service/s3control/internal/customizations"
	smithy "github.com/aws/smithy-go"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
	"strings"
)

// This action gets a bucket policy for an Amazon S3 on Outposts bucket. To get a
// policy for an S3 bucket, see GetBucketPolicy (https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetBucketPolicy.html)
// in the Amazon S3 API Reference. Returns the policy of a specified Outposts
// bucket. For more information, see Using Amazon S3 on Outposts (https://docs.aws.amazon.com/AmazonS3/latest/userguide/S3onOutposts.html)
// in the Amazon S3 User Guide. 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 have the GetBucketPolicy permissions on the specified bucket and
// belong to the bucket owner's account in order to use this action. Only users
// from Outposts bucket owner account with the right permissions can perform
// actions on an Outposts bucket. If you don't have s3-outposts:GetBucketPolicy
// permissions or you're not using an identity that belongs to the bucket owner's
// account, Amazon S3 returns a 403 Access Denied error. As a security precaution,
// the root user of the Amazon Web Services account that owns a bucket can always
// use this action, even if the policy explicitly denies the root user the ability
// to perform this action. For more information about bucket policies, see Using
// Bucket Policies and User Policies (https://docs.aws.amazon.com/AmazonS3/latest/dev/using-iam-policies.html)
// . All Amazon S3 on Outposts REST API requests for this action require an
// additional parameter of x-amz-outpost-id to be passed with the request. In
// addition, you must use an S3 on Outposts endpoint hostname prefix instead of
// s3-control . For an example of the request syntax for Amazon S3 on Outposts that
// uses the S3 on Outposts endpoint hostname prefix and the x-amz-outpost-id
// derived by using the access point ARN, see the Examples (https://docs.aws.amazon.com/AmazonS3/latest/API/API_control_GetBucketPolicy.html#API_control_GetBucketPolicy_Examples)
// section. The following actions are related to GetBucketPolicy :
//   - GetObject (https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObject.html)
//   - PutBucketPolicy (https://docs.aws.amazon.com/AmazonS3/latest/API/API_control_PutBucketPolicy.html)
//   - DeleteBucketPolicy (https://docs.aws.amazon.com/AmazonS3/latest/API/API_control_DeleteBucketPolicy.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 Amazon Web Services account ID of the Outposts bucket.
	//
	// This member is required.
	AccountId *string

	// Specifies the bucket. For using this parameter with Amazon S3 on Outposts with
	// the REST API, you must specify the name and the x-amz-outpost-id as well. For
	// using this parameter with S3 on Outposts with the Amazon Web Services SDK and
	// CLI, you must specify the ARN of the bucket accessed in the format
	// arn:aws:s3-outposts:::outpost//bucket/ . For example, to access the bucket
	// reports through Outpost my-outpost owned by account 123456789012 in Region
	// us-west-2 , use the URL encoding of
	// arn:aws:s3-outposts:us-west-2:123456789012:outpost/my-outpost/bucket/reports .
	// The value must be URL encoded.
	//
	// This member is required.
	Bucket *string

	noSmithyDocumentSerde
}

type GetBucketPolicyOutput struct {

	// The policy of the Outposts bucket.
	Policy *string

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationGetBucketPolicyMiddlewares(stack *middleware.Stack, options Options) (err error) {
	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 = 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 = addEndpointPrefix_opGetBucketPolicyMiddleware(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 = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	return nil
}

type endpointPrefix_opGetBucketPolicyMiddleware struct {
}

func (*endpointPrefix_opGetBucketPolicyMiddleware) ID() string {
	return "EndpointHostPrefix"
}

func (m *endpointPrefix_opGetBucketPolicyMiddleware) HandleSerialize(ctx context.Context, in middleware.SerializeInput, next middleware.SerializeHandler) (
	out middleware.SerializeOutput, metadata middleware.Metadata, err error,
) {
	if smithyhttp.GetHostnameImmutable(ctx) || smithyhttp.IsEndpointHostPrefixDisabled(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.(*GetBucketPolicyInput)
	if !ok {
		return out, metadata, fmt.Errorf("unknown input type %T", in.Parameters)
	}

	var prefix strings.Builder
	if input.AccountId == nil {
		return out, metadata, &smithy.SerializationError{Err: fmt.Errorf("AccountId forms part of the endpoint host and so may not be nil")}
	} else if !smithyhttp.ValidHostLabel(*input.AccountId) {
		return out, metadata, &smithy.SerializationError{Err: fmt.Errorf("AccountId forms part of the endpoint host and so must match \"[a-zA-Z0-9-]{1,63}\", but was \"%s\"", *input.AccountId)}
	} else {
		prefix.WriteString(*input.AccountId)
	}
	prefix.WriteString(".")
	req.URL.Host = prefix.String() + req.URL.Host

	return next.HandleSerialize(ctx, in)
}
func addEndpointPrefix_opGetBucketPolicyMiddleware(stack *middleware.Stack) error {
	return stack.Serialize.Insert(&endpointPrefix_opGetBucketPolicyMiddleware{}, `OperationSerializer`, middleware.After)
}

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

func copyGetBucketPolicyInputForUpdateEndpoint(params interface{}) (interface{}, error) {
	input, ok := params.(*GetBucketPolicyInput)
	if !ok {
		return nil, fmt.Errorf("expect *GetBucketPolicyInput type, got %T", params)
	}
	cpy := *input
	return &cpy, nil
}
func getGetBucketPolicyARNMember(input interface{}) (*string, bool) {
	in := input.(*GetBucketPolicyInput)
	if in.Bucket == nil {
		return nil, false
	}
	return in.Bucket, true
}
func setGetBucketPolicyARNMember(input interface{}, v string) error {
	in := input.(*GetBucketPolicyInput)
	in.Bucket = &v
	return nil
}
func backFillGetBucketPolicyAccountID(input interface{}, v string) error {
	in := input.(*GetBucketPolicyInput)
	if in.AccountId != nil {
		if !strings.EqualFold(*in.AccountId, v) {
			return fmt.Errorf("error backfilling account id")
		}
		return nil
	}
	in.AccountId = &v
	return nil
}
func addGetBucketPolicyUpdateEndpoint(stack *middleware.Stack, options Options) error {
	return s3controlcust.UpdateEndpoint(stack, s3controlcust.UpdateEndpointOptions{
		Accessor: s3controlcust.UpdateEndpointParameterAccessor{GetARNInput: getGetBucketPolicyARNMember,
			BackfillAccountID: backFillGetBucketPolicyAccountID,
			GetOutpostIDInput: nopGetOutpostIDFromInput,
			UpdateARNField:    setGetBucketPolicyARNMember,
			CopyInput:         copyGetBucketPolicyInputForUpdateEndpoint,
		},
		EndpointResolver:        options.EndpointResolver,
		EndpointResolverOptions: options.EndpointOptions,
		UseARNRegion:            options.UseARNRegion,
	})
}