func setChecksumError(r *aws.Request, format string, args ...interface{}) {
r.Retryable = true
r.Error = &aws.APIError{
StatusCode: r.HTTPResponse.StatusCode,
Code: "InvalidChecksum",
Message: fmt.Sprintf(format, args...),
}
}
func validateCRC32(r *aws.Request) {
if r.Error != nil {
return // already have an error, no need to verify CRC
}
// Checksum validation is off, skip
if r.Service.Config.DisableComputeChecksums {
return
}
// Try to get CRC from response
header := r.HTTPResponse.Header.Get("X-Amz-Crc32")
if header == "" {
return // No header, skip
}
expected, err := strconv.ParseUint(header, 10, 32)
if err != nil {
return // Could not determine CRC value, skip
}
buf, err := drainBody(r.HTTPResponse.Body)
if err != nil { // failed to read the response body, skip
return
}
// Reset body for subsequent reads
r.HTTPResponse.Body = ioutil.NopCloser(bytes.NewReader(buf.Bytes()))
// Compute the CRC checksum
crc := crc32.ChecksumIEEE(buf.Bytes())
if crc != uint32(expected) {
// CRC does not match, set a retryable error
r.Retryable = true
r.Error = &aws.APIError{
Code: "CRC32CheckFailed",
Message: "CRC32 integrity check failed",
}
}
}