<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2005 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Environment;

// phpcs:disable PSR1.Files.SideEffects
\defined('_JEXEC') or die;
// phpcs:enable PSR1.Files.SideEffects

/**
 * Browser class, provides capability information about the current web client.
 *
 * Browser identification is performed by examining the HTTP_USER_AGENT
 * environment variable provided by the web server.
 *
 * This class has many influences from the lib/Browser.php code in
 * version 3 of Horde by Chuck Hagenbuch and Jon Parise.
 *
 * @since  1.7.0
 */
class Browser
{
    /**
     * @var    integer  Major version number
     * @since  3.0.0
     */
    protected $majorVersion = 0;

    /**
     * @var    integer  Minor version number
     * @since  3.0.0
     */
    protected $minorVersion = 0;

    /**
     * @var    string  Browser name.
     * @since  3.0.0
     */
    protected $browser = '';

    /**
     * @var    string  Full user agent string.
     * @since  3.0.0
     */
    protected $agent = '';

    /**
     * @var    string  Lower-case user agent string
     * @since  3.0.0
     */
    protected $lowerAgent = '';

    /**
     * @var    string  HTTP_ACCEPT string.
     * @since  3.0.0
     */
    protected $accept = '';

    /**
     * @var    array  Parsed HTTP_ACCEPT string
     * @since  3.0.0
     */
    protected $acceptParsed = [];

    /**
     * @var    string  Platform the browser is running on
     * @since  3.0.0
     */
    protected $platform = '';

    /**
     * @var    array  Known robots.
     * @since  3.0.0
     */
    protected $robots = [
        'Googlebot\/',
        'Googlebot-Mobile',
        'Googlebot-Image',
        'Googlebot-News',
        'Googlebot-Video',
        'AdsBot-Google([^-]|$)',
        'AdsBot-Google-Mobile',
        'Feedfetcher-Google',
        'Mediapartners-Google',
        'Mediapartners \(Googlebot\)',
        'APIs-Google',
        'bingbot',
        'Slurp',
        '[wW]get',
        'curl',
        'LinkedInBot',
        'Python-urllib',
        'python-requests',
        'libwww',
        'httpunit',
        'nutch',
        'Go-http-client',
        'phpcrawl',
        'msnbot',
        'jyxobot',
        'FAST-WebCrawler',
        'FAST Enterprise Crawler',
        'BIGLOTRON',
        'Teoma',
        'convera',
        'seekbot',
        'Gigabot',
        'Gigablast',
        'exabot',
        'ia_archiver',
        'GingerCrawler',
        'webmon ',
        'HTTrack',
        'grub.org',
        'UsineNouvelleCrawler',
        'antibot',
        'netresearchserver',
        'speedy',
        'fluffy',
        'bibnum.bnf',
        'findlink',
        'msrbot',
        'panscient',
        'yacybot',
        'AISearchBot',
        'ips-agent',
        'tagoobot',
        'MJ12bot',
        'woriobot',
        'yanga',
        'buzzbot',
        'mlbot',
        'YandexBot',
        'yandex.com\/bots',
        'purebot',
        'Linguee Bot',
        'CyberPatrol',
        'voilabot',
        'Baiduspider',
        'citeseerxbot',
        'spbot',
        'twengabot',
        'postrank',
        'turnitinbot',
        'scribdbot',
        'page2rss',
        'sitebot',
        'linkdex',
        'Adidxbot',
        'blekkobot',
        'ezooms',
        'dotbot',
        'Mail.RU_Bot',
        'discobot',
        'heritrix',
        'findthatfile',
        'europarchive.org',
        'NerdByNature.Bot',
        'sistrix crawler',
        'Ahrefs(Bot|SiteAudit)',
        'fuelbot',
        'CrunchBot',
        'centurybot9',
        'IndeedBot',
        'mappydata',
        'woobot',
        'ZoominfoBot',
        'PrivacyAwareBot',
        'Multiviewbot',
        'SWIMGBot',
        'Grobbot',
        'eright',
        'Apercite',
        'semanticbot',
        'Aboundex',
        'domaincrawler',
        'wbsearchbot',
        'summify',
        'CCBot',
        'edisterbot',
        'seznambot',
        'ec2linkfinder',
        'gslfbot',
        'aiHitBot',
        'intelium_bot',
        'facebookexternalhit',
        'Yeti',
        'RetrevoPageAnalyzer',
        'lb-spider',
        'Sogou',
        'lssbot',
        'careerbot',
        'wotbox',
        'wocbot',
        'ichiro',
        'DuckDuckBot',
        'lssrocketcrawler',
        'drupact',
        'webcompanycrawler',
        'acoonbot',
        'openindexspider',
        'gnam gnam spider',
        'web-archive-net.com.bot',
        'backlinkcrawler',
        'coccoc',
        'integromedb',
        'content crawler spider',
        'toplistbot',
        'it2media-domain-crawler',
        'ip-web-crawler.com',
        'siteexplorer.info',
        'elisabot',
        'proximic',
        'changedetection',
        'arabot',
        'WeSEE:Search',
        'niki-bot',
        'CrystalSemanticsBot',
        'rogerbot',
        '360Spider',
        'psbot',
        'InterfaxScanBot',
        'CC Metadata Scaper',
        'g00g1e.net',
        'GrapeshotCrawler',
        'urlappendbot',
        'brainobot',
        'fr-crawler',
        'binlar',
        'SimpleCrawler',
        'Twitterbot',
        'cXensebot',
        'smtbot',
        'bnf.fr_bot',
        'A6-Indexer',
        'ADmantX',
        'Facebot',
        'OrangeBot\/',
        'memorybot',
        'AdvBot',
        'MegaIndex',
        'SemanticScholarBot',
        'ltx71',
        'nerdybot',
        'xovibot',
        'BUbiNG',
        'Qwantify',
        'archive.org_bot',
        'Applebot',
        'TweetmemeBot',
        'crawler4j',
        'findxbot',
        'S[eE][mM]rushBot',
        'yoozBot',
        'lipperhey',
        'Y!J',
        'Domain Re-Animator Bot',
        'AddThis',
        'Screaming Frog SEO Spider',
        'MetaURI',
        'Scrapy',
        'Livelap[bB]ot',
        'OpenHoseBot',
        'CapsuleChecker',
        'collection@infegy.com',
        'IstellaBot',
        'DeuSu\/',
        'betaBot',
        'Cliqzbot\/',
        'MojeekBot\/',
        'netEstate NE Crawler',
        'SafeSearch microdata crawler',
        'Gluten Free Crawler\/',
        'Sonic',
        'Sysomos',
        'Trove',
        'deadlinkchecker',
        'Slack-ImgProxy',
        'Embedly',
        'RankActiveLinkBot',
        'iskanie',
        'SafeDNSBot',
        'SkypeUriPreview',
        'Veoozbot',
        'Slackbot',
        'redditbot',
        'datagnionbot',
        'Google-Adwords-Instant',
        'adbeat_bot',
        'WhatsApp',
        'contxbot',
        'pinterest',
        'electricmonk',
        'GarlikCrawler',
        'BingPreview\/',
        'vebidoobot',
        'FemtosearchBot',
        'Yahoo Link Preview',
        'MetaJobBot',
        'DomainStatsBot',
        'mindUpBot',
        'Daum\/',
        'Jugendschutzprogramm-Crawler',
        'Xenu Link Sleuth',
        'Pcore-HTTP',
        'moatbot',
        'KosmioBot',
        'pingdom',
        'PhantomJS',
        'Gowikibot',
        'PiplBot',
        'Discordbot',
        'TelegramBot',
        'Jetslide',
        'newsharecounts',
        'James BOT',
        'Barkrowler',
        'TinEye',
        'SocialRankIOBot',
        'trendictionbot',
        'Ocarinabot',
        'epicbot',
        'Primalbot',
        'DuckDuckGo-Favicons-Bot',
        'GnowitNewsbot',
        'Leikibot',
        'LinkArchiver',
        'YaK\/',
        'PaperLiBot',
        'Digg Deeper',
        'dcrawl',
        'Snacktory',
        'AndersPinkBot',
        'Fyrebot',
        'EveryoneSocialBot',
        'Mediatoolkitbot',
        'Luminator-robots',
        'ExtLinksBot',
        'SurveyBot',
        'NING\/',
        'okhttp',
        'Nuzzel',
        'omgili',
        'PocketParser',
        'YisouSpider',
        'um-LN',
        'ToutiaoSpider',
        'MuckRack',
        'Jamie\'s Spider',
        'AHC\/',
        'NetcraftSurveyAgent',
        'Laserlikebot',
        'Apache-HttpClient',
        'AppEngine-Google',
        'Jetty',
        'Upflow',
        'Thinklab',
        'Traackr.com',
        'Twurly',
        'Mastodon',
        'http_get',
        'DnyzBot',
        'botify',
        '007ac9 Crawler',
        'BehloolBot',
        'BrandVerity',
        'check_http',
        'BDCbot',
        'ZumBot',
        'EZID',
        'ICC-Crawler',
        'ArchiveBot',
        '^LCC ',
        'filterdb.iss.net\/crawler',
        'BLP_bbot',
        'BomboraBot',
        'Buck\/',
        'Companybook-Crawler',
        'Genieo',
        'magpie-crawler',
        'MeltwaterNews',
        'Moreover',
        'newspaper\/',
        'ScoutJet',
        '(^| )sentry\/',
        'StorygizeBot',
        'UptimeRobot',
        'OutclicksBot',
        'seoscanners',
        'Hatena',
        'Google Web Preview',
        'MauiBot',
        'AlphaBot',
        'SBL-BOT',
        'IAS crawler',
        'adscanner',
        'Netvibes',
        'acapbot',
        'Baidu-YunGuanCe',
        'bitlybot',
        'blogmuraBot',
        'Bot.AraTurka.com',
        'bot-pge.chlooe.com',
        'BoxcarBot',
        'BTWebClient',
        'ContextAd Bot',
        'Digincore bot',
        'Disqus',
        'Feedly',
        'Fetch\/',
        'Fever',
        'Flamingo_SearchEngine',
        'FlipboardProxy',
        'g2reader-bot',
        'imrbot',
        'K7MLWCBot',
        'Kemvibot',
        'Landau-Media-Spider',
        'linkapediabot',
        'vkShare',
        'Siteimprove.com',
        'BLEXBot\/',
        'DareBoost',
        'ZuperlistBot\/',
        'Miniflux\/',
        'Feedspotbot\/',
        'Diffbot\/',
        'SEOkicks',
        'tracemyfile',
        'Nimbostratus-Bot',
        'zgrab',
        'PR-CY.RU',
        'AdsTxtCrawler',
        'Datafeedwatch',
        'Zabbix',
        'TangibleeBot',
        'google-xrawler',
        'axios',
        'Amazon CloudFront',
        'Pulsepoint',
    ];

    /**
     * @var    boolean  Is this a mobile browser?
     * @since  3.0.0
     */
    protected $mobile = false;

    /**
     * List of viewable image MIME subtypes.
     * This list of viewable images works for IE and Netscape/Mozilla.
     *
     * @var    array
     * @since  3.0.0
     */
    protected $images = ['jpeg', 'gif', 'png', 'pjpeg', 'x-png', 'bmp'];

    /**
     * @var    array  Browser instances container.
     * @since  1.7.3
     */
    protected static $instances = [];

    /**
     * Create a browser instance (constructor).
     *
     * @param   string  $userAgent  The browser string to parse.
     * @param   string  $accept     The HTTP_ACCEPT settings to use.
     *
     * @since   1.7.0
     */
    public function __construct($userAgent = null, $accept = null)
    {
        $this->match($userAgent, $accept);
    }

    /**
     * Returns the global Browser object, only creating it
     * if it doesn't already exist.
     *
     * @param   string  $userAgent  The browser string to parse.
     * @param   string  $accept     The HTTP_ACCEPT settings to use.
     *
     * @return  Browser  The Browser object.
     *
     * @since   1.7.0
     */
    public static function getInstance($userAgent = null, $accept = null)
    {
        $signature = serialize([$userAgent, $accept]);

        if (empty(self::$instances[$signature])) {
            self::$instances[$signature] = new static($userAgent, $accept);
        }

        return self::$instances[$signature];
    }

    /**
     * Parses the user agent string and inititializes the object with
     * all the known features and quirks for the given browser.
     *
     * @param   string  $userAgent  The browser string to parse.
     * @param   string  $accept     The HTTP_ACCEPT settings to use.
     *
     * @return  void
     *
     * @since   1.7.0
     */
    public function match($userAgent = null, $accept = null)
    {
        // Set our agent string.
        if (\is_null($userAgent)) {
            if (isset($_SERVER['HTTP_USER_AGENT'])) {
                $this->agent = trim($_SERVER['HTTP_USER_AGENT']);
            }
        } else {
            $this->agent = $userAgent;
        }

        $this->lowerAgent = strtolower($this->agent);

        // Set our accept string.
        if (\is_null($accept)) {
            if (isset($_SERVER['HTTP_ACCEPT'])) {
                $this->accept = strtolower(trim($_SERVER['HTTP_ACCEPT']));
            }
        } else {
            $this->accept = strtolower($accept);
        }

        if (!empty($this->agent)) {
            $this->_setPlatform();

            /*
             * Determine if mobile. Note: Some Handhelds have their screen resolution in the
             * user agent string, which we can use to look for mobile agents.
             */
            if (
                str_contains($this->agent, 'MOT-')
                || str_contains($this->lowerAgent, 'j-')
                || preg_match('/(mobileexplorer|openwave|opera mini|opera mobi|operamini|avantgo|wap|elaine)/i', $this->agent)
                || preg_match('/(iPhone|iPod|iPad|Android|Mobile|Phone|BlackBerry|Xiino|Palmscape|palmsource)/i', $this->agent)
                || preg_match('/(Nokia|Ericsson|docomo|digital paths|portalmmm|CriOS[\/ ]([0-9.]+))/i', $this->agent)
                || preg_match('/(UP|UP.B|UP.L)/', $this->agent)
                || preg_match('/; (120x160|240x280|240x320|320x320)\)/', $this->agent)
            ) {
                $this->mobile = true;
            }

            /*
             * We have to check for Edge as the first browser, because Edge has something like:
             * Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.79 Safari/537.36 Edge/14.14393
             */
            if (preg_match('|Edge\/([0-9.]+)|', $this->agent, $version)) {
                $this->setBrowser('edge');

                if (str_contains($version[1], '.')) {
                    [$this->majorVersion, $this->minorVersion] = explode('.', $version[1]);
                } else {
                    $this->majorVersion = $version[1];
                    $this->minorVersion = 0;
                }
            } elseif (preg_match('|Edg\/([0-9.]+)|', $this->agent, $version)) {
                /**
                 * We have to check for Edge as the first browser, because Edge has something like:
                 * Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3738.0 Safari/537.36 Edg/75.0.107.0
                 */
                $this->setBrowser('edg');

                [$this->majorVersion, $this->minorVersion] = explode('.', $version[1]);
            } elseif (preg_match('|Opera[\/ ]([0-9.]+)|', $this->agent, $version)) {
                $this->setBrowser('opera');

                [$this->majorVersion, $this->minorVersion] = explode('.', $version[1]);

                /*
                 * Due to changes in Opera UA, we need to check Version/xx.yy,
                 * but only if version is > 9.80. See: http://dev.opera.com/articles/view/opera-ua-string-changes/
                 */
                if ($this->majorVersion == 9 && $this->minorVersion >= 80) {
                    $this->identifyBrowserVersion();
                }
            } elseif (preg_match('/OPR[\/ ]([0-9.]+)/', $this->agent, $version)) {
                // Opera 15+
                $this->setBrowser('opera');

                [$this->majorVersion, $this->minorVersion] = explode('.', $version[1]);
            } elseif (
                preg_match('/Chrome[\/ ]([0-9.]+)/i', $this->agent, $version)
                || preg_match('/CrMo[\/ ]([0-9.]+)/i', $this->agent, $version)
                || preg_match('/CriOS[\/ ]([0-9.]+)/i', $this->agent, $version)
            ) {
                $this->setBrowser('chrome');

                [$this->majorVersion, $this->minorVersion] = explode('.', $version[1]);
            } elseif (
                str_contains($this->lowerAgent, 'elaine/')
                || str_contains($this->lowerAgent, 'palmsource')
                || str_contains($this->lowerAgent, 'digital paths')
            ) {
                $this->setBrowser('palm');
            } elseif (
                preg_match('/MSIE ([0-9.]+)/i', $this->agent, $version)
                || preg_match('/IE ([0-9.]+)/i', $this->agent, $version)
                || preg_match('/Internet Explorer[\/ ]([0-9.]+)/i', $this->agent, $version)
                || preg_match('/Trident\/.*rv:([0-9.]+)/i', $this->agent, $version)
            ) {
                $this->setBrowser('msie');

                // Special case for IE 11+
                if (str_contains($version[0], 'Trident') && str_contains($version[0], 'rv:')) {
                    preg_match('|rv:([0-9.]+)|', $this->agent, $version);
                }

                if (str_contains($version[1], '.')) {
                    [$this->majorVersion, $this->minorVersion] = explode('.', $version[1]);
                } else {
                    $this->majorVersion = $version[1];
                    $this->minorVersion = 0;
                }
            } elseif (preg_match('|amaya\/([0-9.]+)|', $this->agent, $version)) {
                $this->setBrowser('amaya');
                $this->majorVersion = $version[1];

                if (isset($version[2])) {
                    $this->minorVersion = $version[2];
                }
            } elseif (preg_match('|ANTFresco\/([0-9]+)|', $this->agent, $version)) {
                $this->setBrowser('fresco');
            } elseif (str_contains($this->lowerAgent, 'avantgo')) {
                $this->setBrowser('avantgo');
            } elseif (preg_match('|[Kk]onqueror\/([0-9]+)|', $this->agent, $version) || preg_match('|Safari/([0-9]+)\.?([0-9]+)?|', $this->agent, $version)) {
                // Konqueror and Apple's Safari both use the KHTML rendering engine.
                $this->setBrowser('konqueror');
                $this->majorVersion = $version[1];

                if (isset($version[2])) {
                    $this->minorVersion = $version[2];
                }

                if (str_contains($this->agent, 'Safari') && $this->majorVersion >= 60) {
                    // Safari.
                    $this->setBrowser('safari');
                    $this->identifyBrowserVersion();
                }
            } elseif (preg_match('|Firefox\/([0-9.]+)|', $this->agent, $version)) {
                $this->setBrowser('firefox');

                [$this->majorVersion, $this->minorVersion] = explode('.', $version[1]);
            } elseif (preg_match('|Lynx\/([0-9]+)|', $this->agent, $version)) {
                $this->setBrowser('lynx');
            } elseif (preg_match('|Links \(([0-9]+)|', $this->agent, $version)) {
                $this->setBrowser('links');
            } elseif (preg_match('|HotJava\/([0-9]+)|', $this->agent, $version)) {
                $this->setBrowser('hotjava');
            } elseif (str_contains($this->agent, 'UP/') || str_contains($this->agent, 'UP.B') || str_contains($this->agent, 'UP.L')) {
                $this->setBrowser('up');
            } elseif (str_contains($this->agent, 'Xiino/')) {
                $this->setBrowser('xiino');
            } elseif (str_contains($this->agent, 'Palmscape/')) {
                $this->setBrowser('palmscape');
            } elseif (str_contains($this->agent, 'Nokia')) {
                $this->setBrowser('nokia');
            } elseif (str_contains($this->agent, 'Ericsson')) {
                $this->setBrowser('ericsson');
            } elseif (str_contains($this->lowerAgent, 'wap')) {
                $this->setBrowser('wap');
            } elseif (str_contains($this->lowerAgent, 'docomo') || str_contains($this->lowerAgent, 'portalmmm')) {
                $this->setBrowser('imode');
            } elseif (str_contains($this->agent, 'BlackBerry')) {
                $this->setBrowser('blackberry');
            } elseif (str_contains($this->agent, 'MOT-')) {
                $this->setBrowser('motorola');
            } elseif (str_contains($this->lowerAgent, 'j-')) {
                $this->setBrowser('mml');
            } elseif (preg_match('|Mozilla\/([0-9.]+)|', $this->agent, $version)) {
                $this->setBrowser('mozilla');

                [$this->majorVersion, $this->minorVersion] = explode('.', $version[1]);
            }
        }
    }

    /**
     * Match the platform of the browser.
     *
     * This is a pretty simplistic implementation, but it's intended
     * to let us tell what line breaks to send, so it's good enough
     * for its purpose.
     *
     * @return  void
     *
     * @since   1.7.0
     */
    protected function _setPlatform()
    {
        if (str_contains($this->lowerAgent, 'wind')) {
            $this->platform = 'win';
        } elseif (str_contains($this->lowerAgent, 'mac')) {
            $this->platform = 'mac';
        } else {
            $this->platform = 'unix';
        }
    }

    /**
     * Return the currently matched platform.
     *
     * @return  string  The user's platform.
     *
     * @since   1.7.0
     */
    public function getPlatform()
    {
        return $this->platform;
    }

    /**
     * Set browser version, not by engine version
     * Fallback to use when no other method identify the engine version
     *
     * @return  void
     *
     * @since   1.7.0
     */
    protected function identifyBrowserVersion()
    {
        if (preg_match('|Version[/ ]([0-9.]+)|', $this->agent, $version)) {
            [$this->majorVersion, $this->minorVersion] = explode('.', $version[1]);

            return;
        }

        // Can't identify browser version
        $this->majorVersion = 0;
        $this->minorVersion = 0;
    }

    /**
     * Sets the current browser.
     *
     * @param   string  $browser  The browser to set as current.
     *
     * @return  void
     *
     * @since   1.7.0
     */
    public function setBrowser($browser)
    {
        $this->browser = $browser;
    }

    /**
     * Retrieve the current browser.
     *
     * @return  string  The current browser.
     *
     * @since   1.7.0
     */
    public function getBrowser()
    {
        return $this->browser;
    }

    /**
     * Retrieve the current browser's major version.
     *
     * @return  integer  The current browser's major version
     *
     * @since   1.7.0
     */
    public function getMajor()
    {
        return $this->majorVersion;
    }

    /**
     * Retrieve the current browser's minor version.
     *
     * @return  integer  The current browser's minor version.
     *
     * @since   1.7.0
     */
    public function getMinor()
    {
        return $this->minorVersion;
    }

    /**
     * Retrieve the current browser's version.
     *
     * @return  string  The current browser's version.
     *
     * @since   1.7.0
     */
    public function getVersion()
    {
        return $this->majorVersion . '.' . $this->minorVersion;
    }

    /**
     * Return the full browser agent string.
     *
     * @return  string  The browser agent string
     *
     * @since   1.7.0
     */
    public function getAgentString()
    {
        return $this->agent;
    }

    /**
     * Returns the server protocol in use on the current server.
     *
     * @return  string  The HTTP server protocol version.
     *
     * @since   1.7.0
     */
    public function getHTTPProtocol()
    {
        if (isset($_SERVER['SERVER_PROTOCOL']) && ($pos = strrpos($_SERVER['SERVER_PROTOCOL'], '/'))) {
            return substr($_SERVER['SERVER_PROTOCOL'], $pos + 1);
        }

        return '';
    }

    /**
     * Determines if a browser can display a given MIME type.
     *
     * Note that  image/jpeg and image/pjpeg *appear* to be the same
     * entity, but Mozilla doesn't seem to want to accept the latter.
     * For our purposes, we will treat them the same.
     *
     * @param   string  $mimetype  The MIME type to check.
     *
     * @return  boolean  True if the browser can display the MIME type.
     *
     * @since   1.7.0
     */
    public function isViewable($mimetype)
    {
        $mimetype         = strtolower($mimetype);
        [$type, $subtype] = explode('/', $mimetype);

        if (!empty($this->accept)) {
            $wildcard_match = false;

            if (str_contains($this->accept, $mimetype)) {
                return true;
            }

            if (str_contains($this->accept, '*/*')) {
                $wildcard_match = true;

                if ($type !== 'image') {
                    return true;
                }
            }

            // Deal with Mozilla pjpeg/jpeg issue
            if ($this->isBrowser('mozilla') && ($mimetype === 'image/pjpeg') && (str_contains($this->accept, 'image/jpeg'))) {
                return true;
            }

            if (!$wildcard_match) {
                return false;
            }
        }

        if ($type !== 'image') {
            return false;
        }

        return \in_array($subtype, $this->images);
    }

    /**
     * Determine if the given browser is the same as the current.
     *
     * @param   string  $browser  The browser to check.
     *
     * @return  boolean  Is the given browser the same as the current?
     *
     * @since   1.7.0
     */
    public function isBrowser($browser)
    {
        return $this->browser === $browser;
    }

    /**
     * Determines if the browser is a robot or not.
     *
     * @return  boolean  True if browser is a known robot.
     *
     * @since   1.7.0
     */
    public function isRobot()
    {
        foreach ($this->robots as $robot) {
            if (preg_match('/' . $robot . '/', $this->agent)) {
                return true;
            }
        }

        return false;
    }

    /**
     * Determines if the browser is mobile version or not.
     *
     * @return boolean  True if browser is a known mobile version.
     *
     * @since   1.7.0
     */
    public function isMobile()
    {
        return $this->mobile;
    }
}
