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Filename : RokBrowserCheck.php
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<?php
/**
 * @version   $Id: RokBrowserCheck.php 30540 2017-02-02 15:01:18Z matias $
 * @author    RocketTheme http://www.rockettheme.com
 * @copyright Copyright (C) 2007 - 2017 RocketTheme, LLC
 * @license   http://www.gnu.org/licenses/gpl-2.0.html GNU/GPLv2 only
 */

if (!class_exists('RokBrowserCheck'))
{

    class RokBrowserCheck
    {
        /**
         *
         * @var string The User Agent String for the Browser
         */
        var $_ua;

        /**
         * @var string the general name of the Browser
         */
        var $name;

        /**
         * @var string the browser version
         */
        var $version;

        /**
         * @var string the short browser version
         */
        var $shortversion;

        /**
         * @var string the OS platform the browser is running on
         */
        var $platform;

        /**
         * @var string the base engine the browser uses
         */
        var $engine;

        /**
         * @var array the additional file checks based on the browser
         */
        var $_checks = array();

        /**
         * @param $name
         *
         * @return mixed|null
         */
        public function __get($name)
        {
            switch ($name)
            {
                case 'checks':
                    return null;
                    break;
                case 'shortver':
                    return $this->shortversion;
                    break;
                case 'longver':
                    return $this->version;
                    break;
                case 'browser':
                    return $this->name;
                    break;
                default:
                    if (property_exists($this, $name) && isset($this->{$name}))
                    {
                        return $this->{$name};
                    }
                    elseif (method_exists($this, 'get' . ucfirst($name)))
                    {
                        return call_user_func(array($this, 'get' . ucfirst($name)));
                    }
                    else
                    {
                        return null;
                    }
            }
        }

        function __construct()
        {
            $this->_ua = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : "unknown";
            $this->_checkPlatform();
            $this->_checkBrowser();
            $this->_checkEngine();

            // add short version
            if ($this->version != 'unknown')
            {
                $this->shortversion = substr($this->version, 0, strpos($this->version, '.'));
            }
            else
            {
                $this->shortversion = 'unknown';
            }

            $this->_createChecks();
        }

        /**
         * @return mixed
         */
        function _checkPlatform()
        {
            preg_match('/(CrOS|Tizen|iPhone|iPod|iPad|Android|Mobile|Windows(\ Phone)?|win|Silk|mac|linux|BlackBerry|X11|(New\ )?Nintendo\ (WiiU?|3?DS)|Xbox(\ One))/i',
                $this->_ua, $matches);

            if (isset($matches[0]))
            {
                return $this->platform = strtolower($matches[0]);
            }

            return $this->platform = 'unknown';
        }

        function _checkEngine()
        {
            preg_match('/(trident|dillo|blink|edgehtml|gecko|goanna|khtml|martha|netsurf|presto|prince|robin|servo|tkhtml|webkit)/i', $this->_ua,
                $matches);

            if (isset($matches[0]))
            {
                $this->engine = strtolower($matches[0]);
            }
            else
            {
                $this->engine = 'unknown';
            }
        }

        function _checkBrowser()
        {
            // IE
            if (preg_match('/msie/i', $this->_ua) && !preg_match('/opera/i', $this->_ua))
            {
                $result = explode(' ', stristr(str_replace(';', ' ', $this->_ua), 'msie'));
                $this->name = 'ie';
                //wrap version check in an if statement and check platform token is greater than windows NT 6.1
                if (isset ($result[1]) && preg_match('/windows nt 6[\.1-9]{0,}/i', $this->_ua))
                {
                    $version = explode(' ', $result[1]);
                    //double check if the user agent claims to be IE 7 on Win 7 or above, then force min IE8
                    if ($version[0] = 7)
                    {
                        $this->version = '8';
                    }
                    else
                    {
                        $this->version = $version[0];
                    }
                }
                elseif (isset ($result[1]) && preg_match('/windows nt [0-5]{0,}[\.0-9]{0,}/i', $this->_ua))
                {
                    $version = explode(' ', $result[1]);
                    $this->version = $version[0];
                }
                else
                {
                    $this->version = 'unknown';
                }
            }
            //IE 11+
            elseif (preg_match('#Trident\/.*rv:([0-9]{1,}[\.0-9]{0,})#i', $this->_ua, $matches))
            {
                $this->name = 'ie';
                //wrap version check in an if statement and check platform token is greater than windows NT 6.1
                if (isset ($matches[1]) && preg_match('/windows nt 6[\.1-9]{0,}/i', $this->_ua))
                {
                    $version = explode(' ', $matches[1]);
                    $this->version = $version[0];
                }
                elseif (isset ($result[1]) && preg_match('/windows nt [0-5]{0,}[\.0-9]{0,}/i', $this->_ua))
                {
                    $version = explode(' ', $result[1]);
                    $this->version = $version[0];
                }
                else
                {
                    $this->version = 'unknown';
                }
            }
            //Edge
            elseif (preg_match('#Edge\/.*rv:([0-9]{1,}[\.0-9]{0,})#i', $this->_ua, $matches))
            {
                $this->name = 'edge';
                //wrap version check in an if statement and check platform token is greater than windows NT 10.0
                if (isset ($matches[1]) && preg_match('/windows nt 10[\.0-9]{0,}/i', $this->_ua))
                {
                    $version = explode(' ', $matches[1]);
                    $this->version = $version[0];
                }
                elseif (isset ($result[1]) && preg_match('/windows nt [0-9]{0,}[\.0-9]{0,}/i', $this->_ua))
                {
                    $version = explode(' ', $result[1]);
                    $this->version = $version[0];
                }
                else
                {
                    $this->version = 'unknown';
                }
            }
            // if user agent could be identified as MS Word.
            elseif (preg_match('/(\bWord\b|ms-office|MSOffice|Microsoft Office|sms-office|office)/i', $this->_ua))
            {
                $result = explode('/', stristr($this->_ua, 'Microsoft Office'));
                $version = explode(' ', $result[1]);
                $this->name = 'office';
                $this->version = $version[0];
            }
            // Firefox
            elseif (preg_match('/Firefox/', $this->_ua))
            {
                $result = explode('/', stristr($this->_ua, 'Firefox'));
                $version = explode(' ', $result[1]);
                $this->name = 'firefox';
                $this->version = $version[0];
            }
            // Minefield
            elseif (preg_match('/Minefield/', $this->_ua))
            {
                $result = explode('/', stristr($this->_ua, 'Minefield'));
                $version = explode(' ', $result[1]);
                $this->name = 'minefield';
                $this->version = $version[0];
            }
            // Chrome
            elseif (preg_match('/Chrome/', $this->_ua))
            {
                $result = explode('/', stristr($this->_ua, 'Chrome'));
                $version = explode(' ', $result[1]);
                $this->name = 'chrome';
                $this->version = $version[0];
            }
            //Safari
            elseif (preg_match('/Safari/', $this->_ua) && !preg_match('/iPhone/', $this->_ua) && !preg_match('/iPod/', $this->_ua)
                && !preg_match('/iPad/', $this->_ua)
            )
            {
                $result = explode('/', stristr($this->_ua, 'Version'));
                $this->name = 'safari';
                if (isset ($result[1]))
                {
                    $version = explode(' ', $result[1]);
                    $this->version = $version[0];
                }
                else
                {
                    $this->version = 'unknown';
                }
            }
            // Opera
            elseif (preg_match('/opera/i', $this->_ua))
            {
                $result = stristr($this->_ua, 'opera');

                if (preg_match('/\//', $result))
                {
                    $result = explode('/', $result);
                    $version = explode(' ', $result[1]);
                    $this->name = 'opera';
                    $this->version = $version[0];
                }
                else
                {
                    $version = explode(' ', stristr($result, 'opera'));
                    $this->name = 'opera';
                    $this->version = $version[1];
                }
            }
            // iPod
            elseif (preg_match('/iPod/', $this->_ua))
            {
                $result = explode('/', stristr($this->_ua, 'Version'));
                $this->name = 'ipod';
                if (isset ($result[1]))
                {
                    $version = explode(' ', $result[1]);
                    $this->version = $version[0];
                }
                else
                {
                    $this->version = 'unknown';
                }
            }
            // iPhone
            elseif (preg_match('/iPhone/', $this->_ua))
            {
                $result = explode('/', stristr($this->_ua, 'Version'));
                $this->name = 'iphone';
                if (isset ($result[1]))
                {
                    $version = explode(' ', $result[1]);
                    $this->version = $version[0];
                }
                else
                {
                    $this->version = 'unknown';
                }
            }
            // iPad
            elseif (preg_match('/iPad/', $this->_ua))
            {
                $result = explode('/', stristr($this->_ua, 'Version'));
                $this->name = 'ipad';
                if (isset ($result[1]))
                {
                    $version = explode(' ', $result[1]);
                    $this->version = $version[0];
                }
                else
                {
                    $this->version = 'unknown';
                }
            }
            // Android
            elseif (preg_match('/Android/', $this->_ua))
            {
                $result = explode('/', stristr($this->_ua, 'Version'));
                $this->name = 'android';
                if (isset ($result[1]))
                {
                    $version = explode(' ', $result[1]);
                    $this->version = $version[0];
                }
                else
                {
                    $this->version = "unknown";
                }
            }
            else
            {
                $this->name = "unknown";
                $this->version = "unknown";
            }
        }

        function _createChecks()
        {
            $this->_checks = array(
                $this->name, // browser check
                $this->platform, // platform check
                $this->engine, // render engine
                $this->name . '-' . $this->platform, // browser + platform check
                $this->name . $this->shortversion, // short browser version check
                $this->name . $this->version, // longbrowser version check
                $this->name . $this->shortversion . '-' . $this->platform, // short browser version + platform check
                $this->name . $this->version . '-' . $this->platform // longbrowser version + platform check
            );
        }

        function getChecks($file, $keep_path = false)
        {
            $checkfiles = array();
            $ext = substr($file, strrpos($file, '.'));
            $path = ($keep_path) ? dirname($file) . '/' : '';
            $filename = basename($file, $ext);
            $checkfiles[] = $path . $filename . $ext;
            foreach ($this->_checks as $suffix)
            {
                $checkfiles[] = $path . $filename . '-' . $suffix . $ext;
            }

            return $checkfiles;
        }
    }
}