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package http
import (
"crypto/md5"
"encoding/base64"
"fmt"
"io"
)
// computeMD5Checksum computes base64 md5 checksum of an io.Reader's contents.
// Returns the byte slice of md5 checksum and an error.
func computeMD5Checksum(r io.Reader) ([]byte, error) {
h := md5.New()
// copy errors may be assumed to be from the body.
_, err := io.Copy(h, r)
if err != nil {
return nil, fmt.Errorf("failed to read body: %w", err)
}
// encode the md5 checksum in base64.
sum := h.Sum(nil)
sum64 := make([]byte, base64.StdEncoding.EncodedLen(len(sum)))
base64.StdEncoding.Encode(sum64, sum)
return sum64, nil
}
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