import (
  "encoding/base64"
  "compress/gzip"
  "bytes"
  "os"
  "io
)

// content - base64 gzip content
// path - file path to save
func ExtractAndSaveDocumento(content string, path string) error{

  // base64 to bytes
  data, err := base64.StdEncoding.DecodeString(content)

  if err != nil {
    return err
  }

  // reader to unzip
  bReader := bytes.NewReader(data)
 
  // unzip bytes
  gReader, err := gzip.NewReader(bReader)

  if err != nil {
    return err
  }

  defer gReader.Close()

  writer, err := os.Create(path)

  if err != nil {
    return err
  }

  defer writer.Close()

  // save file content
  if _, err = io.Copy(writer, gReader); err != nil {
    return err
  } 

  return nil
}