Method addSignedTrailer

pkg/signer/request-signature-streaming.go:255–282

addSignedTrailer - adds a trailer with the provided headers, then signs a chunk and adds it to output.

(h http.Header)

// addSignedTrailer - adds a trailer with the provided headers,
// then signs a chunk and adds it to output.
func (s *StreamingReader) addSignedTrailer(h http.Header) {
	olen := len(s.chunkBuf)
	s.chunkBuf = s.chunkBuf[:0]
	for k, v := range h {
		s.chunkBuf = append(s.chunkBuf, []byte(strings.ToLower(k)+trailerKVSeparator+v[0]+"\n")...)
	}

	s.sh256.Reset()
	s.sh256.Write(s.chunkBuf)
	chunkChecksum := hex.EncodeToString(s.sh256.Sum(nil))
	serviceType := s.serviceType
	if serviceType == "" {
		serviceType = ServiceTypeS3
	}
	signature := buildTrailerChunkSignature(chunkChecksum, s.reqTime,
		s.region, s.prevSignature, s.secretAccessKey, serviceType)

	// For next chunk signature computation
	s.prevSignature = signature

	s.buf.Write(s.chunkBuf)
	s.buf.WriteString("\r\n" + trailerSignature + trailerKVSeparator + signature + "\r\n\r\n")

	// Reset chunkBufLen for next chunk read.
	s.chunkBuf = s.chunkBuf[:olen]
	s.chunkBufLen = 0
	s.chunkNum++
}

// setStreamingAuthHeader - builds and sets authorization header value
// for streaming signature.