Language.php

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<?php

namespace SimpleSAML\Locale;

use SimpleSAML\Utils\HTTP;

class Language
{

    private static $defaultLanguageMap = array('nb' => 'no');

    private $configuration;

    private $availableLanguages;

    private $language = null;

    private $defaultLanguage;

    private $rtlLanguages;

    private $languageParameterName;

    private $customFunction;

    private $language_names = array(
        'no'    => 'Bokmål', // Norwegian Bokmål
        'nn'    => 'Nynorsk', // Norwegian Nynorsk
        'se'    => 'Sámegiella', // Northern Sami
        'sma'   => 'Åarjelh-saemien giele', // Southern Sami
        'da'    => 'Dansk', // Danish
        'en'    => 'English',
        'de'    => 'Deutsch', // German
        'sv'    => 'Svenska', // Swedish
        'fi'    => 'Suomeksi', // Finnish
        'es'    => 'Español', // Spanish
        'fr'    => 'Français', // French
        'it'    => 'Italiano', // Italian
        'nl'    => 'Nederlands', // Dutch
        'lb'    => 'Lëtzebuergesch', // Luxembourgish
        'cs'    => 'Čeština', // Czech
        'sl'    => 'Slovenščina', // Slovensk
        'lt'    => 'Lietuvių kalba', // Lithuanian
        'hr'    => 'Hrvatski', // Croatian
        'hu'    => 'Magyar', // Hungarian
        'pl'    => 'Język polski', // Polish
        'pt'    => 'Português', // Portuguese
        'pt-br' => 'Português brasileiro', // Portuguese
        'ru'    => 'русский язык', // Russian
        'et'    => 'eesti keel', // Estonian
        'tr'    => 'Türkçe', // Turkish
        'el'    => 'ελληνικά', // Greek
        'ja'    => '日本語', // Japanese
        'zh'    => '简体中文', // Chinese (simplified)
        'zh-tw' => '繁體中文', // Chinese (traditional)
        'ar'    => 'العربية', // Arabic
        'fa'    => 'پارسی', // Persian
        'ur'    => 'اردو', // Urdu
        'he'    => 'עִבְרִית', // Hebrew
        'id'    => 'Bahasa Indonesia', // Indonesian
        'sr'    => 'Srpski', // Serbian
        'lv'    => 'Latviešu', // Latvian
        'ro'    => 'Românește', // Romanian
        'eu'    => 'Euskara', // Basque
        'af'    => 'Afrikaans', // Afrikaans
    );

    private $languagePosixMapping = array(
        'no' => 'nb_NO',
        'nn' => 'nn_NO',
    );


    public function __construct(\SimpleSAML_Configuration $configuration)
    {
        $this->configuration = $configuration;
        $this->availableLanguages = $this->getInstalledLanguages();
        $this->defaultLanguage = $this->configuration->getString('language.default', 'en');
        $this->languageParameterName = $this->configuration->getString('language.parameter.name', 'language');
        $this->customFunction = $this->configuration->getArray('language.get_language_function', null);
        $this->rtlLanguages = $this->configuration->getArray('language.rtl', array());
        if (isset($_GET[$this->languageParameterName])) {
            $this->setLanguage(
                $_GET[$this->languageParameterName],
                $this->configuration->getBoolean('language.parameter.setcookie', true)
            );
        }
    }


    private function getInstalledLanguages()
    {
        $configuredAvailableLanguages = $this->configuration->getArray('language.available', array('en'));
        $availableLanguages = array();
        foreach ($configuredAvailableLanguages as $code) {
            if (array_key_exists($code, $this->language_names) && isset($this->language_names[$code])) {
                $availableLanguages[] = $code;
            } else {
                \SimpleSAML\Logger::error("Language \"$code\" not installed. Check config.");
            }
        }
        return $availableLanguages;
    }


    public function getPosixLanguage($language)
    {
        if (isset($this->languagePosixMapping[$language])) {
            return $this->languagePosixMapping[$language];
        }
        return $language;
    }


    public function setLanguage($language, $setLanguageCookie = true)
    {
        $language = strtolower($language);
        if (in_array($language, $this->availableLanguages, true)) {
            $this->language = $language;
            if ($setLanguageCookie === true) {
                self::setLanguageCookie($language);
            }
        }
    }


    public function getLanguage()
    {
        // language is set in object
        if (isset($this->language)) {
            return $this->language;
        }

        // run custom getLanguage function if defined
        if (isset($this->customFunction) && is_callable($this->customFunction)) {
            $customLanguage = call_user_func($this->customFunction, $this);
            if ($customLanguage !== null && $customLanguage !== false) {
                return $customLanguage;
            }
        }

        // language is provided in a stored cookie
        $languageCookie = Language::getLanguageCookie();
        if ($languageCookie !== null) {
            $this->language = $languageCookie;
            return $languageCookie;
        }

        // check if we can find a good language from the Accept-Language HTTP header
        $httpLanguage = $this->getHTTPLanguage();
        if ($httpLanguage !== null) {
            return $httpLanguage;
        }

        // language is not set, and we get the default language from the configuration
        return $this->getDefaultLanguage();
    }


    public function getLanguageLocalizedName($code)
    {
        if (array_key_exists($code, $this->language_names) && isset($this->language_names[$code])) {
            return $this->language_names[$code];
        }
        \SimpleSAML\Logger::error("Name for language \"$code\" not found. Check config.");
        return null;
    }


    public function getLanguageParameterName()
    {
        return $this->languageParameterName;
    }


    private function getHTTPLanguage()
    {
        $languageScore = HTTP::getAcceptLanguage();

        // for now we only use the default language map. We may use a configurable language map in the future
        $languageMap = self::$defaultLanguageMap;

        // find the available language with the best score
        $bestLanguage = null;
        $bestScore = -1.0;

        foreach ($languageScore as $language => $score) {
            // apply the language map to the language code
            if (array_key_exists($language, $languageMap)) {
                $language = $languageMap[$language];
            }

            if (!in_array($language, $this->availableLanguages, true)) {
                // skip this language - we don't have it
                continue;
            }

            /* Some user agents use very limited precision of the quality value, but order the elements in descending
             * order. Therefore we rely on the order of the output from getAcceptLanguage() matching the order of the
             * languages in the header when two languages have the same quality.
             */
            if ($score > $bestScore) {
                $bestLanguage = $language;
                $bestScore = $score;
            }
        }

        return $bestLanguage;
    }


    public function getDefaultLanguage()
    {
        return $this->defaultLanguage;
    }


    public function getLanguageCodeAlias($langcode)
    {
        if (isset(self::$defaultLanguageMap[$langcode])) {
            return self::$defaultLanguageMap[$langcode];
        }
        // No alias found, which is fine
        return null;
    }


    public function getLanguageList()
    {
        $current = $this->getLanguage();
        $list = array_fill_keys($this->availableLanguages, false);
        $list[$current] = true;
        return $list;
    }


    public function isLanguageRTL()
    {
        return in_array($this->getLanguage(), $this->rtlLanguages, true);
    }


    public static function getLanguageCookie()
    {
        $config = \SimpleSAML_Configuration::getInstance();
        $availableLanguages = $config->getArray('language.available', array('en'));
        $name = $config->getString('language.cookie.name', 'language');

        if (isset($_COOKIE[$name])) {
            $language = strtolower((string) $_COOKIE[$name]);
            if (in_array($language, $availableLanguages, true)) {
                return $language;
            }
        }

        return null;
    }


    public static function setLanguageCookie($language)
    {
        assert('is_string($language)');

        $language = strtolower($language);
        $config = \SimpleSAML_Configuration::getInstance();
        $availableLanguages = $config->getArray('language.available', array('en'));

        if (!in_array($language, $availableLanguages, true) || headers_sent()) {
            return;
        }

        $name = $config->getString('language.cookie.name', 'language');
        $params = array(
            'lifetime' => ($config->getInteger('language.cookie.lifetime', 60 * 60 * 24 * 900)),
            'domain'   => ($config->getString('language.cookie.domain', null)),
            'path'     => ($config->getString('language.cookie.path', '/')),
            'secure'   => ($config->getBoolean('language.cookie.secure', false)),
            'httponly' => ($config->getBoolean('language.cookie.httponly', false)),
        );

        HTTP::setCookie($name, $language, $params, false);
    }
}