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<?php

/**

 * This is a PHP library that handles calling reCAPTCHA.

 *

 * @copyright Copyright (c) 2015, Google Inc.

 * @link      http://www.google.com/recaptcha

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

namespace ReCaptcha;

/**

 * reCAPTCHA client.

 */

class ReCaptcha

{

    /**

     * Version of this client library.

     * @const string

     */

    const VERSION = 'php_1.1.2';

    /**

     * Shared secret for the site.

     * @var type string

     */

    private $secret;

    /**

     * Method used to communicate  with service. Defaults to POST request.

     * @var RequestMethod

     */

    private $requestMethod;

    /**

     * Create a configured instance to use the reCAPTCHA service.

     *

     * @param string $secret shared secret between site and reCAPTCHA server.

     * @param RequestMethod $requestMethod method used to send the request. Defaults to POST.

     */

    public function __construct($secret, RequestMethod $requestMethod = null)

    {

        if (empty($secret)) {

            throw new \RuntimeException('No secret provided');

        }

        if (!is_string($secret)) {

            throw new \RuntimeException('The provided secret must be a string');

        }

        $this->secret = $secret;

        if (!is_null($requestMethod)) {

            $this->requestMethod = $requestMethod;

        } else {

            $this->requestMethod = new RequestMethod\Post();

        }

    }

    /**

     * Calls the reCAPTCHA siteverify API to verify whether the user passes

     * CAPTCHA test.

     *

     * @param string $response The value of 'g-recaptcha-response' in the submitted form.

     * @param string $remoteIp The end user's IP address.

     * @return Response Response from the service.

     */

    public function verify($response, $remoteIp = null)

    {

        // Discard empty solution submissions

        if (empty($response)) {

            $recaptchaResponse = new Response(false, array('missing-input-response'));

            return $recaptchaResponse;

        }

        $params = new RequestParameters($this->secret, $response, $remoteIp, self::VERSION);

        $rawResponse = $this->requestMethod->submit($params);

        return Response::fromJson($rawResponse);

    }

}