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package s3
import (
"context"
"fmt"
"path"
awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
"github.com/aws/aws-sdk-go-v2/internal/endpoints/awsrulesfn"
smithy "github.com/aws/smithy-go"
"github.com/aws/smithy-go/encoding/httpbinding"
"github.com/aws/smithy-go/middleware"
smithyhttp "github.com/aws/smithy-go/transport/http"
)
// serializeImmutableHostnameBucketMiddleware handles injecting the bucket name into
// "immutable" hostnames resolved via v1 EndpointResolvers. This CANNOT be done in
// serialization, since v2 endpoint resolution requires removing the {Bucket} path
// segment from all S3 requests.
//
// This will only be done for non-ARN buckets, as the features that use those require
// virtualhost manipulation to function and we previously (pre-ep2) expected the caller
// to handle that in their resolver.
type serializeImmutableHostnameBucketMiddleware struct {
UsePathStyle bool
}
func (*serializeImmutableHostnameBucketMiddleware) ID() string {
return "serializeImmutableHostnameBucket"
}
func (m *serializeImmutableHostnameBucketMiddleware) HandleSerialize(
ctx context.Context, in middleware.SerializeInput, next middleware.SerializeHandler,
) (
out middleware.SerializeOutput, metadata middleware.Metadata, err error,
) {
request, ok := in.Request.(*smithyhttp.Request)
if !ok {
return out, metadata, &smithy.SerializationError{Err: fmt.Errorf("unknown transport type %T", in.Request)}
}
bucket, ok := bucketFromInput(in.Parameters)
if !ok {
return next.HandleSerialize(ctx, in)
}
// a bucket being un-vhostable will also force us to use path style
usePathStyle := m.UsePathStyle || !awsrulesfn.IsVirtualHostableS3Bucket(bucket, request.URL.Scheme != "https")
if !smithyhttp.GetHostnameImmutable(ctx) &&
!(awsmiddleware.GetRequiresLegacyEndpoints(ctx) && usePathStyle) {
return next.HandleSerialize(ctx, in)
}
parsedBucket := awsrulesfn.ParseARN(bucket)
// disallow ARN buckets except for MRAP arns
if parsedBucket != nil && len(parsedBucket.Region) > 0 {
return next.HandleSerialize(ctx, in)
}
request.URL.Path = path.Join(request.URL.Path, bucket)
request.URL.RawPath = path.Join(request.URL.RawPath, httpbinding.EscapePath(bucket, true))
return next.HandleSerialize(ctx, in)
}
func addSerializeImmutableHostnameBucketMiddleware(stack *middleware.Stack, options Options) error {
return stack.Serialize.Insert(
&serializeImmutableHostnameBucketMiddleware{
UsePathStyle: options.UsePathStyle,
},
"OperationSerializer",
middleware.Before,
)
}
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