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<?php
class ARMember_ReCaptchaResponse
{
    public $success;
    public $errorCodes;
}

class ARMember_ReCaptcha
{
    private static $_signupUrl = "https://www.google.com/recaptcha/admin";
    private static $_siteVerifyUrl =
        "https://www.google.com/recaptcha/api/siteverify?";
    private $_secret;
    private static $_version = "php_1.0";

    /**
     * Constructor.
     *
     * @param string $secret shared secret between site and ReCAPTCHA server.
     */
    function __construct($secret)
    {
        if ($secret == null || $secret == "") {
            die("To use reCAPTCHA you must get an API key from <a href='"
                . self::$_signupUrl . "'>" . self::$_signupUrl . "</a>");
        }
        $this->_secret=$secret;
    }

    /**
     * Encodes the given data into a query string format.
     *
     * @param array $data array of string elements to be encoded.
     *
     * @return string - encoded request.
     */
    private function _encodeQS($data)
    {
        $req = "";
        foreach ($data as $key => $value) {
            $req .= $key . '=' . urlencode(stripslashes($value)) . '&';
        }

        // Cut the last '&'
        $req=substr($req, 0, strlen($req)-1);
        return $req;
    }

    /**
     * Submits an HTTP GET to a reCAPTCHA server.
     *
     * @param string $path url path to recaptcha server.
     * @param array  $data array of parameters to be sent.
     *
     * @return array response
     */
    private function _submitHTTPGet( $path, $data )
    {
        $req = $this->_encodeQS($data);
        if ( version_compare( phpversion(), '5.6', '<' ) ) {
            $response = file_get_contents( $path . $req );
        } else {
            $ctx = array(
               'ssl' => array(
                  'verify_peer' => false,
                  'verify_peer_name' => false,
                  'allow_self_signed' => true
               )
            );
            $response = file_get_contents( $path . $req, false, stream_context_create( $ctx ) );
        }
        return $response;
    }

    /**
     * Calls the reCAPTCHA siteverify API to verify whether the user passes
     * CAPTCHA test.
     *
     * @param string $remoteIp   IP address of end user.
     * @param string $response   response string from recaptcha verification.
     *
     * @return ARMember_ReCaptchaResponse
     */
    public function verifyResponse($remoteIp, $response)
    {
        //echo 'remoteIp=>'.$remoteIp;
        //echo 'response=>'.$response;
        // Discard empty solution submissions
        if ($response == null || strlen($response) == 0) {
            $recaptchaResponse = new ARMember_ReCaptchaResponse();
            $recaptchaResponse->success = false;
            $recaptchaResponse->errorCodes = 'missing-input';
            return $recaptchaResponse;
        }

        $getResponse = $this->_submitHttpGet(
            self::$_siteVerifyUrl,
            array (
                'secret' => $this->_secret,
                'remoteip' => $remoteIp,
                'v' => self::$_version,
                'response' => $response
            )
        );
        
        $answers = json_decode($getResponse, true);
        $recaptchaResponse = new ARMember_ReCaptchaResponse();

        if (trim($answers ['success']) == true) {
            $recaptchaResponse->success = true;
        } else {
            $recaptchaResponse->success = false;
            $recaptchaResponse->errorCodes = isset( $answers["error-codes"] ) ? $answers["error-codes"] : '';
        }

        return $recaptchaResponse;
    }
}

?>