func serveCaptchaAudio(ctx *web.Context, id string) {
//tell the user's browser not to cache the audio file
//(would cause old audio file to be used even if user has reloaded the CAPTCHA)
ctx.SetHeader("Cache-Control", "no-cache", true)
err := captcha.WriteAudio(ctx, id, "english")
if err != nil {
logger.Println("Error, could not write CAPTCHA audio")
logger.Println(err.Error())
}
}
func (controller *Captcha) serve(w http.ResponseWriter, r *http.Request, id, ext, lang string, download bool) error {
w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
w.Header().Set("Pragma", "no-cache")
w.Header().Set("Expires", "0")
var content bytes.Buffer
switch ext {
case ".png":
w.Header().Set("Content-Type", "image/png")
captcha.WriteImage(&content, id, captcha.StdWidth, captcha.StdHeight)
case ".wav":
w.Header().Set("Content-Type", "audio/x-wav")
captcha.WriteAudio(&content, id, lang)
default:
return captcha.ErrNotFound
}
if download {
w.Header().Set("Content-Type", "application/octet-stream")
}
http.ServeContent(w, r, id+ext, time.Time{}, bytes.NewReader(content.Bytes()))
return nil
}
func (o *Captcha) MarshalWAV(w io.Writer) locale.Error {
// TODO: generate WAV and write it to w
return locale.UntranslatedError(captcha.WriteAudio(w, o.ID, "en"))
}