peridot/vendor/github.com/aws/aws-sdk-go/private/checksum/content_md5.go
2022-07-07 22:13:21 +02:00

54 lines
1.3 KiB
Go

package checksum
import (
"crypto/md5"
"encoding/base64"
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/request"
)
const contentMD5Header = "Content-Md5"
// AddBodyContentMD5Handler computes and sets the HTTP Content-MD5 header for requests that
// require it.
func AddBodyContentMD5Handler(r *request.Request) {
// if Content-MD5 header is already present, return
if v := r.HTTPRequest.Header.Get(contentMD5Header); len(v) != 0 {
return
}
// if S3DisableContentMD5Validation flag is set, return
if aws.BoolValue(r.Config.S3DisableContentMD5Validation) {
return
}
// if request is presigned, return
if r.IsPresigned() {
return
}
// if body is not seekable, return
if !aws.IsReaderSeekable(r.Body) {
if r.Config.Logger != nil {
r.Config.Logger.Log(fmt.Sprintf(
"Unable to compute Content-MD5 for unseekable body, S3.%s",
r.Operation.Name))
}
return
}
h := md5.New()
if _, err := aws.CopySeekableBody(h, r.Body); err != nil {
r.Error = awserr.New("ContentMD5", "failed to compute body MD5", err)
return
}
// encode the md5 checksum in base64 and set the request header.
v := base64.StdEncoding.EncodeToString(h.Sum(nil))
r.HTTPRequest.Header.Set(contentMD5Header, v)
}