1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
// Copyright 2011 Dmitry Chestnykh. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
// example of HTTP server that uses the captcha package.
//
//nolint:forbidigo
package main
import (
"fmt"
"io"
"log"
"net/http"
"text/template"
"code.forgejo.org/go-chi/captcha"
)
var formTemplate = template.Must(template.New("example").Parse(formTemplateSrc))
func showFormHandler(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
d := struct {
CaptchaID string
}{
captcha.New(),
}
if err := formTemplate.Execute(w, &d); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
func processFormHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
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("localhost:8666", nil); err != nil {
log.Fatal(err)
}
}
const formTemplateSrc = `<!doctype html>
<head><title>Captcha Example</title></head>
<body>
<script>
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 reload() {
setSrcQuery(document.getElementById('image'), "reload=" + (new Date()).getTime());
return false;
}
</script>
<form action="/process" method=post>
<p>Type the numbers you see in the picture below:</p>
<p><img style="transform: scaleX(-1)" id=image src="/captcha/{{.CaptchaID}}.png" alt="Captcha image"></p>
<a href="#" onclick="reload()">Reload</a>
<input type=hidden name=captchaId value="{{.CaptchaID}}"><br>
<input name=captchaSolution>
<input type=submit value=Submit>
</form>
`
|
