//adapted from Revel framework BinaryResult.Apply method
func (r *StreamResult) Write(ctx framework.WebContext) error {
var err error
// If we have a ReadSeeker, delegate to http.ServeContent
if rs, ok := r.Reader.(io.ReadSeeker); ok {
http.ServeContent(ctx, ctx.Req(), r.Name, r.ModTime, rs)
} else {
// Else, do a simple io.Copy.
if r.Length != -1 {
ctx.Header().Set("Content-Length", strconv.FormatInt(r.Length, 10))
}
ctx.WriteHeader(http.StatusOK)
//TODO: use a mime-type to file extension strategy like Revel does
//ctx.ContentType("application/octet-stream")
//ctx.ContentType(ContentTypeByFilename(r.Name))
_, err = io.Copy(ctx, r.Reader)
}
// Close the Reader if we can
if v, ok := r.Reader.(io.Closer); ok {
v.Close()
}
return err
}