Google ReCaptcha Laravel 5 Integration (validation rule)

AppServiceProvider.php

/**
 * Bootstrap any application services.
 *
 * @return void
 */
public function boot()
{
	$this->app->validator->resolver(function($translator, $data, $rules, $messages)
	{
		return new GoogleReCaptchaValidator($translator, $data, $rules, $messages);
	});
}

GoogleReCaptcha.php

<?php namespace App\Services\Validators\GoogleReCaptcha;

class GoogleReCaptcha {

    const GOOGLE_VERIFY_URL = 'https://www.google.com/recaptcha/api/siteverify';

    private $secret;

    /**
     * @param string $secret
     */
    function __construct($secret)
    {
        $this->secret = $secret;
    }

    /**
     * Verifies reCAPTCHA's response by sending GET request to Google.
     * 
     * @param string $gReCaptchaResponse
     * @return array
     */
    public function verify($gReCaptchaResponse)
    {
        $queryString = http_build_query([
            'secret' => $this->secret,
            'response' => $gReCaptchaResponse
        ]);

        $url = sprintf('%s?%s', self::GOOGLE_VERIFY_URL, $queryString);

        return json_decode(file_get_contents($url), true);
    }
}

GoogleReCaptchaValidator.php

<?php namespace App\Services\Validators\GoogleReCaptcha;

use \Illuminate\Validation\Validator as IlluminateValidator;

class GoogleReCaptchaValidator extends IlluminateValidator {

    /**
     * @param \Symfony\Component\Translation\TranslatorInterface $translator
     * @param array $data
     * @param array $rules
     * @param array $messages
     * @param array $customAttributes
     */
    public function __construct($translator, $data, $rules, $messages = [], $customAttributes = [])
    {
        parent::__construct($translator, $data, $rules, $messages, $customAttributes);

        $this->setCustomMessages([
            'reCaptchVerified' => 'Google reCaptcha response returned failure. Try again.'
        ]);
    }

    /**
     * Implementation of our validation rule for Google reCaptcha.
     *
     * @param string $attribute
     * @param string $value
     * @param array $parameters
     * @return boolean mixed
     */
    public function validateReCaptchaVarified($attribute, $value, array $parameters)
    {
        $recaptcha = new GoogleReCaptcha(env('RECAPTCHA_KEY'));

        $response = $recaptcha->verify($value);

        return $response->success;
    }
}