captcha

Overview ¶

Package captcha wraps github.com/dchest/captcha and provides an sqlite store for it.

Initialize the captcha package:

captcha.Initialize("captcha.sqlite3")

Register the captcha handler in your HTTP router:

router.Handler(http.MethodGet, "/captcha/:fn", captcha.Handler())

Parse the captcha template string along with your HTML templates:

t = template.Must(t.Parse(captcha.TemplateString))

Execute the template:

{{template "captcha" .Captcha}}

Pass captcha data to your template:

type MyTemplateData struct {
    Captcha captcha.TemplateData
    // ...

Create a captcha in your GET handler:

myTemplateData.Captcha.ID = captcha.New()

In your POST handler, call Verify after validating other input because Verify invalidates the captcha. If you're executing the template again, you must create a new captcha.

id := r.PostFormValue("captcha-id")
answer := r.PostFormValue("captcha-answer")
if !captcha.Verify(id, answer) {
    data.Captcha.ID = captcha.New()
    data.Captcha.Err = true
    html.MyTemplate.Execute(w, data)
    return
}