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Add captcha support. 

If captchas are enabled, when the form is submitted store the
e-mail details in a session and redirect to the captcha page.

Captchas are presented as images with a link for audio versions.
Reloading the captcha page will regenerate the captcha.
tags/v1.1.0^0
Chris Smith 4 years ago
parent
0e78ac577d
commit
d50ef942b3
Signed by: Chris Smith <chris@chameth.com> GPG Key ID: 3A2D4BBDC4A3C9A9
6 changed files with 684 additions and 16 deletions
Unified View Show Diff Stats
  1. 10
    2
      README.adoc
  2. 138
    0
      captcha.go
  3. 82
    0
      captcha.html
  4. 59
    6
      go.mod
  5. 349
    0
      go.sum
  6. 46
    8
      main.go

+ 10
- 2
README.adoc View File

27 
 ----
 27 
 ----
28 
   -crsf-key string
 28 
   -crsf-key string
29 
     	CRSF key to use [CONTACT_CRSF_KEY]
 29 
     	CRSF key to use [CONTACT_CRSF_KEY]
30 
+  -enable-captcha
31 
+        Whether to require captchas to be completed [CONTACT_ENABLE_CAPTCHA]
30 
   -from string
 32 
   -from string
31 
     	address to send e-mail from [CONTACT_FROM]
 33 
     	address to send e-mail from [CONTACT_FROM]
32 
   -port int
 34 
   -port int
33 
     	port to listen on for connections [CONTACT_PORT] (default 8080)
 35 
     	port to listen on for connections [CONTACT_PORT] (default 8080)
36 
+  -session-key string
37 
+        Session key to use (for captcha support) [CONTACT_SESSION_KEY]
34 
   -smtp-host string
 38 
   -smtp-host string
35 
     	SMTP server to connect to [CONTACT_SMTP_HOST]
 39 
     	SMTP server to connect to [CONTACT_SMTP_HOST]
36 
   -smtp-pass string
 40 
   -smtp-pass string
52 
 == Templates
 56 
 == Templates
53
57
54 
 The form itself is loaded from `form.html` in the working directory; success and failure pages from `success.html`
 58 
 The form itself is loaded from `form.html` in the working directory; success and failure pages from `success.html`
55 
-and `failure.html` respectively. Each is loaded as a https://golang.org/pkg/html/template/[go html.template] and
56 
-can use the templating syntax described there. The form must contain the `{{ .csrfField }}` template field, which
59 
+and `failure.html` respectively. If captcha support is enabled, the captcha page is loaded from `captcha.html`.
60 
+Each page is loaded as a https://golang.org/pkg/html/template/[go html.template] and
61 
+can use the templating syntax described there. Forms must contain the `{{ .csrfField }}` template field, which
57 
 will automatically insert the CSRF token for the request.
 62 
 will automatically insert the CSRF token for the request.
58
63
59 
 Any query parameters passed to the form will be accessible through the `{{ .params }}` template field. The
 64 
 Any query parameters passed to the form will be accessible through the `{{ .params }}` template field. The
71 
 Developed by https://chameth.com[Chris Smith]; CSS heavily based on the login form in
 76 
 Developed by https://chameth.com[Chris Smith]; CSS heavily based on the login form in
72 
  https://github.com/greboid/ig[ig] by https://greboid.com[Greg Holmes].
 77 
  https://github.com/greboid/ig[ig] by https://greboid.com[Greg Holmes].
73
78
79 
+Captchas are implemented using the https://github.com/dchest/captcha[dchest/captcha]
80 
+library, and most functionality utilises libraries from the https://www.gorillatoolkit.org/[Gorilla web toolkit].
81 
+
74 
 == Licence
 82 
 == Licence
75
83
76 
 This software is licensed under the MIT licence. See the LICENCE.adoc file for the full text.
 84 
 This software is licensed under the MIT licence. See the LICENCE.adoc file for the full text.

+ 138
- 0
captcha.go View File

1 
+package main
2 
+
3 
+import (
4 
+	"github.com/dchest/captcha"
5 
+	"github.com/gorilla/csrf"
6 
+	"log"
7 
+	"net/http"
8 
+)
9 
+
10 
+func beginCaptcha(rw http.ResponseWriter, req *http.Request, body string, replyTo string) {
11 
+	session, err := store.New(req, sessionName)
12 
+	if err != nil {
13 
+		log.Printf("Unable to get session: %s", err.Error())
14 
+		rw.Header().Add("Location", "failure")
15 
+		rw.WriteHeader(http.StatusSeeOther)
16 
+		return
17 
+	}
18 
+
19 
+	session.Values[bodyKey] = body
20 
+	session.Values[replyToKey] = replyTo
21 
+
22 
+	err = session.Save(req, rw)
23 
+	if err != nil {
24 
+		log.Printf("Unable to save session: %s", err.Error())
25 
+		rw.Header().Add("Location", "failure")
26 
+		rw.WriteHeader(http.StatusSeeOther)
27 
+		return
28 
+	}
29 
+
30 
+	rw.Header().Add("Location", "captcha")
31 
+	rw.WriteHeader(http.StatusSeeOther)
32 
+}
33 
+
34 
+func showCaptcha(rw http.ResponseWriter, req *http.Request) {
35 
+	session, err := store.Get(req, sessionName)
36 
+	if err != nil {
37 
+		log.Printf("Unable to get session: %s", err.Error())
38 
+		rw.Header().Add("Location", "failure")
39 
+		rw.WriteHeader(http.StatusSeeOther)
40 
+		return
41 
+	}
42 
+
43 
+	captchaId, ok := session.Values[captchaKey]
44 
+	if !ok || !captcha.Reload(captchaId.(string)) {
45 
+		captchaId = captcha.New()
46 
+		session.Values[captchaKey] = captchaId
47 
+
48 
+		if err := session.Save(req, rw); err != nil {
49 
+			log.Printf("Unable to save session: %s", err.Error())
50 
+			rw.Header().Add("Location", "failure")
51 
+			rw.WriteHeader(http.StatusSeeOther)
52 
+			return
53 
+		}
54 
+	}
55 
+
56 
+	_ = captchaTemplate.ExecuteTemplate(rw, "captcha.html", map[string]interface{}{
57 
+		csrf.TemplateTag: csrf.TemplateField(req),
58 
+	})
59 
+}
60 
+
61 
+func writeCaptchaImage(rw http.ResponseWriter, req *http.Request) {
62 
+	captchaId, ok := findCaptcha(req)
63 
+	if !ok {
64 
+		rw.WriteHeader(http.StatusForbidden)
65 
+		return
66 
+	}
67 
+
68 
+	rw.Header().Set("Cache-Control", "no-cache")
69 
+	rw.Header().Set("Content-Type", "image/png")
70 
+	if err := captcha.WriteImage(rw, captchaId, captcha.StdWidth, captcha.StdHeight); err != nil {
71 
+		log.Printf("Unable to generate image captcha: %s", err.Error())
72 
+		rw.WriteHeader(http.StatusInternalServerError)
73 
+		return
74 
+	}
75 
+}
76 
+
77 
+func writeCaptchaAudio(rw http.ResponseWriter, req *http.Request) {
78 
+	captchaId, ok := findCaptcha(req)
79 
+	if !ok {
80 
+		rw.WriteHeader(http.StatusForbidden)
81 
+		return
82 
+	}
83 
+
84 
+	rw.Header().Set("Cache-Control", "no-cache")
85 
+	rw.Header().Set("Content-Type", "audio/wav")
86 
+	rw.Header().Set("Content-Disposition", "attachment")
87 
+	if err := captcha.WriteAudio(rw, captchaId, "en"); err != nil {
88 
+		log.Printf("Unable to generate audio captcha: %s", err.Error())
89 
+		rw.WriteHeader(http.StatusInternalServerError)
90 
+		return
91 
+	}
92 
+}
93 
+
94 
+func handleSolve(rw http.ResponseWriter, req *http.Request) {
95 
+	captchaId, ok := findCaptcha(req)
96 
+	if !ok {
97 
+		rw.WriteHeader(http.StatusForbidden)
98 
+		return
99 
+	}
100 
+
101 
+	digits := req.Form.Get("captcha")
102 
+	if !captcha.VerifyString(captchaId, digits) {
103 
+		rw.Header().Add("Location", "failure")
104 
+		rw.WriteHeader(http.StatusSeeOther)
105 
+		return
106 
+	}
107 
+
108 
+	session, err := store.Get(req, sessionName)
109 
+	if err != nil {
110 
+		log.Printf("Unable to get session: %s", err.Error())
111 
+		rw.Header().Add("Location", "failure")
112 
+		rw.WriteHeader(http.StatusSeeOther)
113 
+		return
114 
+	}
115 
+
116 
+	if sendMail(session.Values[replyToKey].(string), session.Values[bodyKey].(string)) {
117 
+		rw.Header().Add("Location", "success")
118 
+		rw.WriteHeader(http.StatusSeeOther)
119 
+	} else {
120 
+		rw.Header().Add("Location", "failure")
121 
+		rw.WriteHeader(http.StatusSeeOther)
122 
+	}
123 
+}
124 
+
125 
+func findCaptcha(req *http.Request) (string, bool) {
126 
+	session, err := store.Get(req, sessionName)
127 
+	if err != nil {
128 
+		log.Printf("Unable to get session: %s", err.Error())
129 
+		return "", false
130 
+	}
131 
+
132 
+	captchaId, ok := session.Values[captchaKey]
133 
+	if !ok {
134 
+		return "", false
135 
+	}
136 
+
137 
+	return captchaId.(string), true
138 
+}

+ 82
- 0
captcha.html View File

1 
+<!DOCTYPE html>
2 
+<html lang="en">
3 
+<head>
4 
+    <meta http-equiv="Content-Type" content="text/html" charset="UTF-8"/>
5 
+    <title>Contact me</title>
6 
+    <style type="text/css">
7 
+        p {
8 
+            font-family: sans-serif;
9 
+        }
10 
+
11 
+        .page {
12 
+            width: 640px;
13 
+            margin: auto;
14 
+        }
15 
+
16 
+        .form {
17 
+            position: relative;
18 
+            z-index: 1;
19 
+            background: #FFFFFF;
20 
+            max-width: 640px;
21 
+            margin: 0 auto;
22 
+            padding: 25px 45px 35px 45px;
23 
+            text-align: center;
24 
+        }
25 
+
26 
+        .form input {
27 
+            outline: 0;
28 
+            background: #f2f2f2;
29 
+            width: 100%;
30 
+            border: 0;
31 
+            margin: 0 0 15px;
32 
+            padding: 15px;
33 
+            box-sizing: border-box;
34 
+            font-size: 14px;
35 
+        }
36 
+
37 
+        .form button {
38 
+            text-transform: uppercase;
39 
+            outline: 0;
40 
+            background: #4CAF50;
41 
+            width: 100%;
42 
+            border: 0;
43 
+            padding: 15px;
44 
+            color: #FFFFFF;
45 
+            font-size: 14px;
46 
+            transition: all 0.3 ease;
47 
+            cursor: pointer;
48 
+        }
49 
+
50 
+        .form button:hover, .form button:active, .form button:focus {
51 
+            background: #43A047;
52 
+        }
53 
+    </style>
54 
+</head>
55 
+<body>
56 
+<div class="page">
57 
+    <div class="form">
58 
+        <form action="solve" method="post">
59 
+            {{ .csrfField }}
60 
+            <p>
61 
+                As a protection against automated spam, please type in the
62 
+                numbers in the image below.
63 
+            </p>
64 
+            <p>
65 
+                Alternatively, you can listen  to an <a href="captcha.wav">audio version</a>.
66 
+            </p>
67 
+
68 
+            <p>
69 
+                If you are unable to read the image, <a href="captcha">reload the page</a>
70 
+                to generate a new one.
71 
+            </p>
72 
+
73 
+            <img src="captcha.png" alt="Captcha">
74 
+
75 
+            <input type="text" minlength="6" maxlength="6" name="captcha" placeholder="Captcha value" pattern="[0-9]*" inputmode="numeric" required>
76 
+
77 
+            <button>Submit</button>
78 
+        </form>
79 
+    </div>
80 
+</div>
81 
+</body>
82 
+</html>

+ 59
- 6
go.mod View File

3 
 go 1.12
 3 
 go 1.12
4
4
5 
 require (
 5 
 require (
6 
-	github.com/gorilla/csrf v1.5.1 // indirect
7 
-	github.com/gorilla/mux v1.7.1 // indirect
8 
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
9 
-	github.com/jamiealquiza/envy v1.1.0 // indirect
10 
-	github.com/spf13/cobra v0.0.3 // indirect
11 
-	github.com/spf13/pflag v1.0.3 // indirect
6 
+	cloud.google.com/go v0.47.0 // indirect
7 
+	cloud.google.com/go/bigquery v1.2.0 // indirect
8 
+	cloud.google.com/go/storage v1.1.2 // indirect
9 
+	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
10 
+	github.com/coreos/bbolt v1.3.3 // indirect
11 
+	github.com/coreos/etcd v3.3.17+incompatible // indirect
12 
+	github.com/coreos/go-semver v0.3.0 // indirect
13 
+	github.com/coreos/go-systemd v0.0.0-20190719114852-fd7a80b32e1f // indirect
14 
+	github.com/creack/pty v1.1.9 // indirect
15 
+	github.com/dchest/captcha v0.0.0-20170622155422-6a29415a8364
16 
+	github.com/gogo/protobuf v1.3.1 // indirect
17 
+	github.com/golang/groupcache v0.0.0-20191027212112-611e8accdfc9 // indirect
18 
+	github.com/google/go-cmp v0.3.1 // indirect
19 
+	github.com/google/pprof v0.0.0-20191028172815-5e965273ee43 // indirect
20 
+	github.com/gorilla/context v1.1.1 // indirect
21 
+	github.com/gorilla/csrf v1.6.1
22 
+	github.com/gorilla/mux v1.7.3
23 
+	github.com/gorilla/sessions v1.2.0
24 
+	github.com/gorilla/websocket v1.4.1 // indirect
25 
+	github.com/grpc-ecosystem/go-grpc-middleware v1.1.0 // indirect
26 
+	github.com/grpc-ecosystem/grpc-gateway v1.11.3 // indirect
27 
+	github.com/hashicorp/golang-lru v0.5.3 // indirect
28 
+	github.com/jamiealquiza/envy v1.1.0
29 
+	github.com/json-iterator/go v1.1.8 // indirect
30 
+	github.com/jstemmer/go-junit-report v0.9.1 // indirect
31 
+	github.com/julienschmidt/httprouter v1.3.0 // indirect
32 
+	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
33 
+	github.com/kr/pty v1.1.8 // indirect
34 
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
35 
+	github.com/modern-go/reflect2 v1.0.1 // indirect
36 
+	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f // indirect
37 
+	github.com/pelletier/go-toml v1.6.0 // indirect
38 
+	github.com/prometheus/client_golang v1.2.1 // indirect
39 
+	github.com/rogpeppe/fastuuid v1.2.0 // indirect
40 
+	github.com/rogpeppe/go-internal v1.5.0 // indirect
41 
+	github.com/russross/blackfriday v2.0.0+incompatible // indirect
42 
+	github.com/spf13/afero v1.2.2 // indirect
43 
+	github.com/spf13/cobra v0.0.5 // indirect
44 
+	github.com/spf13/jwalterweatherman v1.1.0 // indirect
45 
+	github.com/spf13/pflag v1.0.5 // indirect
46 
+	github.com/spf13/viper v1.5.0 // indirect
47 
+	github.com/stretchr/objx v0.2.0 // indirect
48 
+	github.com/ugorji/go v1.1.7 // indirect
49 
+	go.etcd.io/bbolt v1.3.3 // indirect
50 
+	go.opencensus.io v0.22.1 // indirect
51 
+	go.uber.org/zap v1.12.0 // indirect
52 
+	golang.org/x/crypto v0.0.0-20191029031824-8986dd9e96cf // indirect
53 
+	golang.org/x/exp v0.0.0-20191030013958-a1ab85dbe136 // indirect
54 
+	golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8 // indirect
55 
+	golang.org/x/mobile v0.0.0-20191031020345-0945064e013a // indirect
56 
+	golang.org/x/net v0.0.0-20191101175033-0deb6923b6d9 // indirect
57 
+	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e // indirect
58 
+	golang.org/x/sys v0.0.0-20191029155521-f43be2a4598c // indirect
59 
+	golang.org/x/time v0.0.0-20191024005414-555d28b269f0 // indirect
60 
+	golang.org/x/tools v0.0.0-20191101200257-8dbcdeb83d3f // indirect
61 
+	golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898 // indirect
62 
+	google.golang.org/appengine v1.6.5 // indirect
63 
+	google.golang.org/grpc v1.24.0 // indirect
64 
+	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
12 
 )
 65 
 )

+ 349
- 0
go.sum View File

1 
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2 
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+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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18 
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
19 
+github.com/OneOfOne/xxhash v1.2.5/go.mod h1:eZbhyaAYD41SGSSsnmcpxVoRiQ/MPUTjUdIIOT9Um7Q=
20 
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
21 
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
22 
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
23 
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
24 
+github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
25 
+github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
26 
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
27 
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+ 46
- 8
main.go View File

5 
 	"fmt"
 5 
 	"fmt"
6 
 	"github.com/gorilla/csrf"
 6 
 	"github.com/gorilla/csrf"
7 
 	"github.com/gorilla/mux"
 7 
 	"github.com/gorilla/mux"
8 
+	"github.com/gorilla/sessions"
8 
 	"github.com/jamiealquiza/envy"
 9 
 	"github.com/jamiealquiza/envy"
9 
 	"html/template"
 10 
 	"html/template"
10 
 	"log"
 11 
 	"log"
17
18
18 
 const (
 19 
 const (
19 
 	csrfFieldName = "csrf.Token"
 20 
 	csrfFieldName = "csrf.Token"
21 
+	sessionName   = "contactform"
22 
+	bodyKey       = "body"
23 
+	replyToKey    = "replyTo"
24 
+	captchaKey    = "captchaId"
20 
 )
 25 
 )
21
26
22 
 var (
 27 
 var (
23 
-	fromAddress, toAddress, subject, smtpServer, smtpUsername, smtpPassword, csrfKey *string
24 
-	smtpPort, port                                                                   *int
25 
-	formTemplate, successTemplate, failureTemplate                                   *template.Template
28 
+	fromAddress, toAddress, subject        *string
29 
+	smtpServer, smtpUsername, smtpPassword *string
30 
+	csrfKey, sessionKey                    *string
31 
+	smtpPort, port                         *int
32 
+	enableCaptcha                          *bool
33 
+	store                                  *sessions.CookieStore
34 
+	formTemplate                           *template.Template
35 
+	captchaTemplate                        *template.Template
36 
+	successTemplate, failureTemplate       *template.Template
26 
 )
 37 
 )
27
38
28 
 func sendMail(replyTo, message string) bool {
 39 
 func sendMail(replyTo, message string) bool {
36 
 	return true
 47 
 	return true
37 
 }
 48 
 }
38
49
39 
-func handleForm(rw http.ResponseWriter, req *http.Request) {
50 
+func handleSubmit(rw http.ResponseWriter, req *http.Request) {
40 
 	body := ""
 51 
 	body := ""
41 
 	for k, v := range req.Form {
 52 
 	for k, v := range req.Form {
42 
 		if k != csrfFieldName {
 53 
 		if k != csrfFieldName {
48 
 	replyTo = strings.ReplaceAll(replyTo, "\n", "")
 59 
 	replyTo = strings.ReplaceAll(replyTo, "\n", "")
49 
 	replyTo = strings.ReplaceAll(replyTo, "\r", "")
 60 
 	replyTo = strings.ReplaceAll(replyTo, "\r", "")
50
61
51 
-	if sendMail(replyTo, body) {
62 
+	if *enableCaptcha {
63 
+		beginCaptcha(rw, req, body, replyTo)
64 
+	} else if sendMail(replyTo, body) {
52 
 		rw.Header().Add("Location", "success")
 65 
 		rw.Header().Add("Location", "success")
66 
+		rw.WriteHeader(http.StatusSeeOther)
53 
 	} else {
 67 
 	} else {
54 
 		rw.Header().Add("Location", "failure")
 68 
 		rw.Header().Add("Location", "failure")
69 
+		rw.WriteHeader(http.StatusSeeOther)
55 
 	}
 70 
 	}
56 
-	rw.WriteHeader(http.StatusSeeOther)
57 
 }
 71 
 }
58
72
59 
 func showForm(rw http.ResponseWriter, req *http.Request) {
 73 
 func showForm(rw http.ResponseWriter, req *http.Request) {
119 
 	smtpUsername = flag.String("smtp-user", "", "username to supply to the SMTP server")
 133 
 	smtpUsername = flag.String("smtp-user", "", "username to supply to the SMTP server")
120 
 	smtpPassword = flag.String("smtp-pass", "", "password to supply to the SMTP server")
 134 
 	smtpPassword = flag.String("smtp-pass", "", "password to supply to the SMTP server")
121 
 	csrfKey = flag.String("crsf-key", "", "CRSF key to use")
 135 
 	csrfKey = flag.String("crsf-key", "", "CRSF key to use")
136 
+	sessionKey = flag.String("session-key", "", "Session key to use (for captcha support)")
137 
+	enableCaptcha = flag.Bool("enable-captcha", false, "Whether to require captchas to be completed")
122 
 	port = flag.Int("port", 8080, "port to listen on for connections")
 138 
 	port = flag.Int("port", 8080, "port to listen on for connections")
139 
+
123 
 	envy.Parse("CONTACT")
 140 
 	envy.Parse("CONTACT")
124 
 	flag.Parse()
 141 
 	flag.Parse()
125
142
134 
 		csrfKey = &newKey
 151 
 		csrfKey = &newKey
135 
 	}
 152 
 	}
136
153
154 
+	if len(*sessionKey) != 32 {
155 
+		newKey := randomKey()
156 
+		sessionKey = &newKey
157 
+	}
158 
+
159 
+	store = sessions.NewCookieStore([]byte(*sessionKey))
160 
+	store.Options =  &sessions.Options{
161 
+		MaxAge:   0,
162 
+		Secure:   false, //true,
163 
+		HttpOnly: true,
164 
+		SameSite: http.SameSiteStrictMode,
165 
+	}
166 
+
137 
 	formTemplate = loadTemplate("form.html")
 167 
 	formTemplate = loadTemplate("form.html")
168 
+	captchaTemplate = loadTemplate("captcha.html")
138 
 	successTemplate = loadTemplate("success.html")
 169 
 	successTemplate = loadTemplate("success.html")
139 
 	failureTemplate = loadTemplate("failure.html")
 170 
 	failureTemplate = loadTemplate("failure.html")
140
171
142 
 	r.HandleFunc("/", showForm).Methods("GET")
 173 
 	r.HandleFunc("/", showForm).Methods("GET")
143 
 	r.HandleFunc("/success", showSuccess).Methods("GET")
 174 
 	r.HandleFunc("/success", showSuccess).Methods("GET")
144 
 	r.HandleFunc("/failure", showFailure).Methods("GET")
 175 
 	r.HandleFunc("/failure", showFailure).Methods("GET")
145 
-	r.HandleFunc("/submit", handleForm).Methods("POST")
176 
+	r.HandleFunc("/submit", handleSubmit).Methods("POST")
177 
+
178 
+	// Captcha endpoints
179 
+	r.HandleFunc("/captcha", showCaptcha).Methods("GET")
180 
+	r.HandleFunc("/captcha.png", writeCaptchaImage).Methods("GET")
181 
+	r.HandleFunc("/captcha.wav", writeCaptchaAudio).Methods("GET")
182 
+	r.HandleFunc("/solve", handleSolve).Methods("POST")
146
183
147 
-	CSRF := csrf.Protect([]byte(*csrfKey), csrf.FieldName(csrfFieldName))
184 
+	// If developing locally, you'll need to pass csrf.Secure(false) as an argument below.
185 
+	CSRF := csrf.Protect([]byte(*csrfKey), csrf.FieldName(csrfFieldName), csrf.Secure(false))
148 
 	err := http.ListenAndServe(fmt.Sprintf(":%d", *port), CSRF(r))
 186 
 	err := http.ListenAndServe(fmt.Sprintf(":%d", *port), CSRF(r))
149 
 	if err != nil {
 187 
 	if err != nil {
150 
 		_, _ = fmt.Fprintf(os.Stderr, "Unable to listen on port %d: %s\n", *port, err.Error())
 188 
 		_, _ = fmt.Fprintf(os.Stderr, "Unable to listen on port %d: %s\n", *port, err.Error())

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