/wp-content/plugins/smart-slider-3/nextend/library/nextend.php

<?php



class N2 {



    public static $version = '2.0.21';

    public static $api = 'https://secure.nextendweb.com/api/api.php';



    public static function api($posts, $returnUrl = false) {



        if ($returnUrl) {

            $posts_default = array(

                'platform' => N2Platform::getPlatform()

            );



            return self::$api . '?' . http_build_query($posts + $posts_default);

        }



        if (!isset($data)) {

            if (function_exists('curl_init') && function_exists('curl_exec') && N2Settings::get('curl', 1)) {

                $ch = curl_init();

                curl_setopt($ch, CURLOPT_URL, self::$api);



                $posts_default = array(

                    'platform' => N2Platform::getPlatform()

                );

                curl_setopt($ch, CURLOPT_POSTFIELDS, $posts + $posts_default);

                curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

                curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);

                curl_setopt($ch, CURLOPT_TIMEOUT, 30);



                if (N2Settings::get('curl-clean-proxy', 0)) {

                    curl_setopt($ch, CURLOPT_PROXY, '');

                }

                $data        = curl_exec($ch);

                $errorNumber = curl_errno($ch);

                if ($errorNumber == 60 || $errorNumber == 77) {

                    curl_setopt($ch, CURLOPT_CAINFO, N2LIBRARY . '/cacert.pem');

                    $data = curl_exec($ch);

                }

                $contentType     = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);

                $error           = curl_error($ch);

                $curlErrorNumber = curl_errno($ch);

                curl_close($ch);



                if ($curlErrorNumber) {

                    N2Message::error($curlErrorNumber . $error);



                    return array(

                        'status' => 'ERROR_HANDLED'

                    );

                }

            } else {

                $posts_default = array(

                    'platform' => N2Platform::getPlatform()

                );



                $opts    = array(

                    'http' => array(

                        'method'  => 'POST',

                        'header'  => 'Content-type: application/x-www-form-urlencoded',

                        'content' => http_build_query($posts + $posts_default)

                    )

                );

                $context = stream_context_create($opts);

                $data    = file_get_contents(self::$api, false, $context);

                if ($data === false) {

                    N2Message::error(n2_('CURL disabled in your php.ini configuration. Please enable it!'));



                    return array(

                        'status' => 'ERROR_HANDLED'

                    );

                }

                $headers = self::parseHeaders($http_response_header);

                if ($headers['status'] != '200') {

                    N2Message::error(n2_('Unable to contact with the licensing server, please try again later!'));



                    return array(

                        'status' => 'ERROR_HANDLED'

                    );

                }

                if (isset($headers['content-type'])) {

                    $contentType = $headers['content-type'];

                }

            }

        }



        switch ($contentType) {

            case 'text/html; charset=UTF-8':

                //CloudFlare challenge

                preg_match('/"your_ip">.*?:[ ]*(.*?)<\/span>/', $data, $matches);

                if (count($matches)) {

                    $blockedIP = $matches[1];



                    N2Message::error(sprintf('Your ip address (%s) is blocked by our hosting provider.<br>Please contact us (support@nextendweb.com) with your ip to whitelist it.', $blockedIP));



                    return array(

                        'status' => 'ERROR_HANDLED'

                    );

                }



                N2Message::error(sprintf('Unexpected response from the API.<br>Please contact us (support@nextendweb.com) with the following log:') . '<br><textarea style="width: 100%;height:200px;font-size:8px;">' . base64_encode($data) . '</textarea>');



                return array(

                    'status' => 'ERROR_HANDLED'

                );

                break;

            case 'application/json':

                return json_decode($data, true);

        }



        return $data;

    }



    private static function parseHeaders(array $headers, $header = null) {

        $output = array();

        if ('HTTP' === substr($headers[0], 0, 4)) {

            list(, $output['status'], $output['status_text']) = explode(' ', $headers[0]);

            unset($headers[0]);

        }

        foreach ($headers as $v) {

            $h = preg_split('/:\s*/', $v);

            if (count($h) >= 2) {

                $output[strtolower($h[0])] = $h[1];

            }

        }

        if (null !== $header) {

            if (isset($output[strtolower($header)])) {

                return $output[strtolower($header)];

            }



            return;

        }



        return $output;

    }

}