ReCaptcha v2 Laravel Validation Rule

recaptcha2.php

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class recaptcha2 implements Rule
{
    /**
     * Create a new rule instance.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        $url = 'https://www.google.com/recaptcha/api/siteverify?secret=' . urlencode('recaptcha-secret-key') .  '&response=' . urlencode($value);
        $response = file_get_contents($url);
        $responseKeys = json_decode($response,true);
        return $responseKeys["success"];
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return 'recaptcha-not-valid';
    }
}