Source of CBrandHelper.php - Zabbix

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<?php
/*
** Zabbix
** Copyright (C) 2001-2022 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
**/
​
​
/**
 * A class for Zabbix re-branding.
 */
class CBrandHelper {
​
    const BRAND_CONFIG_FILE_PATH = '/../../../local/conf/brand.conf.php';
​
    /**
     * Brand configuration array.
     *
     * @var array
     */
    private static $config = [];
​
    /**
     * Lazy configuration loading.
     */
    private static function loadConfig() {
        if (!self::$config) {
            $config_file_path = realpath(dirname(__FILE__).self::BRAND_CONFIG_FILE_PATH);
​
            if (file_exists($config_file_path)) {
                self::$config = include $config_file_path;
                if (is_array(self::$config)) {
                    self::$config['IS_REBRANDED'] = true;
                }
                else {
                    self::$config = [];
                }
            }
        }
    }
​
    /**
     * Get value by key from configuration (load configuration if needed).
     *
     * @param string $key      configuration key
     * @param mixed  $default  default value
     *
     * @return mixed
     */
    private static function getValue($key, $default = false) {
        self::loadConfig();
​
        return (array_key_exists($key, self::$config) ? self::$config[$key] : $default);
    }
​
    /**
     * Is branding active ?
     *
     * @return boolean
     */
    public static function isRebranded() {
        return self::getValue('IS_REBRANDED');
    }
​
    /**
     * Get help URL.
     *
     * @return string
     */
    public static function getHelpUrl() {
        return self::getValue('BRAND_HELP_URL', 'https://www.zabbix.com/documentation/'.
            (preg_match('/^\d+\.\d+/', ZABBIX_VERSION, $version) ? $version[0].'/' : '')
        );
    }
​
    /**
     * Get logo of the specified type.
     *