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// example of HTTP server that uses the captcha package.
package main
import (
"github.com/dchest/captcha"
"http"
"template"
)
var formTemplate = template.MustParse(formTemplateSrc, nil)
func showFormHandler(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
d := struct {
CaptchaId string
JavaScript string
}{
if err := formTemplate.Execute(w, &d); err != nil {
http.Error(w, err.String(), http.StatusInternalServerError)
}
}
func processFormHandler(w http.ResponseWriter, r *http.Request) {
if !captcha.VerifyString(r.FormValue("captchaId"), r.FormValue("captchaSolution")) {
io.WriteString(w, "Wrong captcha solution! No robots allowed!\n")
} else {
io.WriteString(w, "Great job, human! You solved the captcha.\n")
io.WriteString(w, "<br><a href='/'>Try another one</a>")
}
func main() {
http.HandleFunc("/", showFormHandler)
http.HandleFunc("/process", processFormHandler)
http.Handle("/captcha/", captcha.Server(captcha.StdWidth, captcha.StdHeight))
fmt.Println("Server is at localhost:8666")
if err := http.ListenAndServe(":8666", nil); err != nil {
log.Fatal(err)
}
function playAudio() {
var e = document.getElementById('audio')
e.style.display = 'block';
e.play();
return false;
}
function reload() {
function setSrcQuery(e, q) {
var src = e.src;
var p = src.indexOf('?');
if (p >= 0) {
src = src.substr(0, p);
}
e.src = src + "?" + q
}
setSrcQuery(document.getElementById('image'), "reload=" + (new Date()).getTime());
setSrcQuery(document.getElementById('audio'), (new Date()).getTime());
return false;
}
`
const formTemplateSrc = `<!doctype html>
<head><title>Captcha Example</title></head>
<body>
<script>
{JavaScript}
</script>
<form action="/process" method=post>
<p>Type the numbers you see in the picture below:</p>
<p><img id=image src="/captcha/{CaptchaId}.png" alt="Captcha image"></p>
<a href="#" onclick="reload()">Reload</a> | <a href="#" onclick="playAudio()">Play Audio</a>
<audio id=audio controls style="display:none" src="/captcha/{CaptchaId}.wav" preload=none>
You browser doesn't support audio.
<a href="/captcha/download/{CaptchaId}.wav">Download file</a> to play it in the external player.
<input type=hidden name=captchaId value="{CaptchaId}"><br>
<input name=captchaSolution>
<input type=submit value=Submit>