37 lines
945 B
Go
37 lines
945 B
Go
package s3
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import (
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"crypto/md5"
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"encoding/base64"
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"io"
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"github.com/aws/aws-sdk-go/aws/awserr"
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"github.com/aws/aws-sdk-go/aws/request"
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)
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// contentMD5 computes and sets the HTTP Content-MD5 header for requests that
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// require it.
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func contentMD5(r *request.Request) {
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h := md5.New()
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// hash the body. seek back to the first position after reading to reset
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// the body for transmission. copy errors may be assumed to be from the
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// body.
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_, err := io.Copy(h, r.Body)
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if err != nil {
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r.Error = awserr.New("ContentMD5", "failed to read body", err)
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return
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}
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_, err = r.Body.Seek(0, 0)
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if err != nil {
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r.Error = awserr.New("ContentMD5", "failed to seek body", err)
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return
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}
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// encode the md5 checksum in base64 and set the request header.
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sum := h.Sum(nil)
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sum64 := make([]byte, base64.StdEncoding.EncodedLen(len(sum)))
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base64.StdEncoding.Encode(sum64, sum)
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r.HTTPRequest.Header.Set("Content-MD5", string(sum64))
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}
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