Arcaptcha

Arcaptcha library implementation in Golang to verify captcha.

Guide

Installation

go get -u github.com/arcaptcha/arcaptcha-go

Usage

Register on Arcaptcha, create website and get your own SiteKey and SecretKey

website := arcaptcha.NewWebsite("YOUR_SITE_KEY", "YOUR_SECRET_KEY")
//'arcaptcha-response' is created for each captcha
//After you put captcha widget in your website, you can get 'arcaptcha-response' from form
result, err := website.Verify("arcaptcha-response")
if err != nil {
// error in sending or receiving API request
// handle error
}
if !result.Success {
// captcha not verified
// can see result.ErrorCodes to find what's wrong
// throw specific error
}
// it's ok

Use in middleware:

package main

import (
	"net/http"

	"github.com/arcaptcha/arcaptcha-go"
)

var website *arcaptcha.Website

func main() {
	website = arcaptcha.NewWebsite("YOUR_SITE_KEY", "YOUR_SECRET_KEY")

	myHandler := http.HandlerFunc(handler)
	http.Handle("/", verifyCaptcha(myHandler))
	http.ListenAndServe(":8000", nil)
}

func handler(w http.ResponseWriter, r *http.Request) {
	// handle request
}

func verifyCaptcha(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		r.ParseForm()
		response := r.FormValue("arcaptcha-response")
		result, err := website.Verify(response)
		if err != nil {
			// error in sending or receiving API request
			// handle error
		}
		if !result.Success {
			// captcha not verified
			// can see result.ErrorCodes to find what's wrong
			// throw specific error
			return
		}
		// it's ok
		next.ServeHTTP(w, r)
	})
}

you can set timeout for verify request:

website := arcaptcha.NewWebsite("YOUR_SITE_KEY", "YOUR_SECRET_KEY")
website.SetTimeout(1*time.Second)
result, err := website.Verify("arcaptcha-response") // returns "context deadline" error if it takes more than 1 second