recaptcha

recaptcha is a package that handles verifying reCAPTCHA v2/v3 submissions in Go.

Validating a verification request, sending a verification request, and parsing a verification response are separated into individual functions.
Validates and double-checks all outgoing requests and incoming responses for errors.
Interoperable and made easy to work with both reCAPTCHA v2 and v3.
Uses valyala/fasthttp for sending reCAPTCHA request with an optional timeout.
Uses valyala/fastjson for parsing responses from the reCAPTCHA API.

Inspiration

Someone told me they were looking through reCAPTCHA packages online in Go and couldn't find a simple, idiomatic one.

This one's a bit overly optimized and uses two popular 3rd party libraries over the standard library, but here you go ¯_(ツ)_/.

Usage

go get github.com/lithdew/recaptcha

package main

import (
    "github.com/lithdew/recaptcha"
    "time"
)

func main() {
    req := recaptcha.Request{
        Secret: "", // Your reCAPTCHA secret.
        Response: "", // The reCAPTCHA response sent by the reCAPTCHA API.
        RemoteIP : "", // (optional) The remote IP of the user submitting the reCAPTCHA response.
    }

    // Verify the reCAPTCHA request.
    
    res, err := recaptcha.Do(req) 
    if err != nil {
    	panic(err)
    }

    if res.Success {
        println("reCAPTCHA attempt successfully verified!")
    } else {
        println("reCAPTCHA attempt failed!")
    }

    // Verify the reCAPTCHA request, and timeout after 3 seconds.

    res, err = recaptcha.DoTimeout(req, 3 * time.Second) 
    if err != nil {
    	panic(err)
    }

    if res.Success {
        println("reCAPTCHA attempt successfully verified!")
    } else {
        println("reCAPTCHA attempt failed!")
    }
}

Benchmarks

Take these with a grain of salt; network latency should sum up the majority of the benchmark results.

go test -bench=. -benchmem -benchtime=10s

goos: linux
goarch: amd64
pkg: github.com/lithdew/recaptcha
BenchmarkDo-8                        187          55273288 ns/op            1513 B/op         17 allocs/op
BenchmarkDoTimeout-8                 205          55503923 ns/op            1482 B/op         19 allocs/op
BenchmarkParallelDo-8               1500           7060534 ns/op            1386 B/op         17 allocs/op
BenchmarkParallelDoTimeout-8        1740           6752978 ns/op            1405 B/op         18 allocs/op