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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\RequestMethod;

use ReCaptcha\RequestMethod;

use ReCaptcha\RequestParameters;

/**

 * Sends cURL request to the reCAPTCHA service.

 * Note: this requires the cURL extension to be enabled in PHP

 * @see http://php.net/manual/en/book.curl.php

 */

class CurlPost implements RequestMethod

{

    /**

     * URL to which requests are sent via cURL.

     * @const string

     */

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

    /**

     * Curl connection to the reCAPTCHA service

     * @var Curl

     */

    private $curl;

    public function __construct(Curl $curl = null)

    {

        if (!is_null($curl)) {

            $this->curl = $curl;

        } else {

            $this->curl = new Curl();

        }

    }

    /**

     * Submit the cURL request with the specified parameters.

     *

     * @param RequestParameters $params Request parameters

     * @return string Body of the reCAPTCHA response

     */

    public function submit(RequestParameters $params)

    {

        $handle = $this->curl->init(self::SITE_VERIFY_URL);

        $options = array(

            CURLOPT_POST => true,

            CURLOPT_POSTFIELDS => $params->toQueryString(),

            CURLOPT_HTTPHEADER => array(

                'Content-Type: application/x-www-form-urlencoded'

            ),

            CURLINFO_HEADER_OUT => false,

            CURLOPT_HEADER => false,

            CURLOPT_RETURNTRANSFER => true,

            CURLOPT_SSL_VERIFYPEER => true

        );

        $this->curl->setoptArray($handle, $options);

        $response = $this->curl->exec($handle);

        $this->curl->close($handle);

        return $response;

    }

}