// example of HTTP server that uses the captcha package.
package main
import (
"fmt"
"github.com/dchest/captcha"
"http"
"io"
"log"
"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
}{
captcha.New(),
formJavaScript,
}
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, "
Try another one")
}
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)
}
}
const formJavaScript = `
function setSrcQuery(e, q) {
var src = e.src;
var p = src.indexOf('?');
if (p >= 0) {
src = src.substr(0, p);
}
e.src = src + "?" + q
}
function playAudio() {
var le = document.getElementById("lang");
var lang = le.options[le.selectedIndex].value;
var e = document.getElementById('audio')
setSrcQuery(e, "lang=" + lang)
e.style.display = 'block';
e.autoplay = 'true';
return false;
}
function changeLang() {
var e = document.getElementById('audio')
if (e.style.display == 'block') {
playAudio();
}
}
function reload() {
setSrcQuery(document.getElementById('image'), "reload=" + (new Date()).getTime());
setSrcQuery(document.getElementById('audio'), (new Date()).getTime());
return false;
}
`
const formTemplateSrc = `
Captcha Example
`