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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 POST requests to the reCAPTCHA service.

 */

class Post implements RequestMethod

{

    /**

     * URL to which requests are POSTed.

     * @const string

     */

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

    /**

     * Submit the POST request with the specified parameters.

     *

     * @param RequestParameters $params Request parameters

     * @return string Body of the reCAPTCHA response

     */

    public function submit(RequestParameters $params)

    {

        /**

         * PHP 5.6.0 changed the way you specify the peer name for SSL context options.

         * Using "CN_name" will still work, but it will raise deprecated errors.

         */

        $peer_key = version_compare(PHP_VERSION, '5.6.0', '<') ? 'CN_name' : 'peer_name';

        $options = array(

            'http' => array(

                'header' => "Content-type: application/x-www-form-urlencoded\r\n",

                'method' => 'POST',

                'content' => $params->toQueryString(),

                // Force the peer to validate (not needed in 5.6.0+, but still works

                'verify_peer' => true,

                // Force the peer validation to use www.google.com

                $peer_key => 'www.google.com',

            ),

        );

        $context = stream_context_create($options);

        return file_get_contents(self::SITE_VERIFY_URL, false, $context);

    }

}