Mini Shell

<?php
/**
 * Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
 *
 * Licensed under CLOUD LINUX LICENSE AGREEMENT
 * http://cloudlinux.com/docs/LICENSE.TXT
 */


namespace App\Base;

/**
 * Class Base
 *
 * @package selector\base
 * @author: Ruslan Rakhmanberdiev
 */
class Base extends Component {
    /**
     * SPA billing name.
     */
    const BILLING_SPA = 'Spa';

    /**
     * Alias of admin.
     */
    const OWNER_ADMIN = 'admin';

    /**
     * Alias of user.
     */
    const OWNER_USER = 'user';

    /**
     * Alias of reseller.
     */
    const OWNER_RESELLER = 'reseller';

    /**
     * Default app mode
     */
    const APP_MODE = 'PRODUCTION_MODE';

    /**
     * Billing system manager object
     *
     * @var SpaManager
     */
    public $billingManager;

    /**
     * Billing system text name
     *
     * @var string
     */
    private $billing;

    /**
     * Corresponds if it was called ajax request from web-server.
     *
     * @var bool
     */
    public $isAJAX = false;

    /**
     * User type: admin or user.
     *
     * @var
     */
    private $owner = 'user';

    /**
     * @param string $billing
     */
    public function __construct($billing = self::BILLING_SPA)
    {
        $this->setBilling($billing);
    }

    /**
     * Getter
     *
     * @param $name
     * @return mixed
     * @throws \Exception
     */
    public function __get($name)
    {
        if(method_exists($this, 'get'.ucfirst($name))) {
            return $this->{'get'.ucfirst($name)};
        } elseif(isset($this->{$name})) {
            return $this->{$name};
        } else {
            throw new Exception('Undefined property');
        }
    }

    /**
     * Run application engine.
     *
     * @param bool $isAJAX
     * @param str $owner
     */
    public function run($isAJAX = false, $owner = self::OWNER_USER)
    {
        try {
            $this->getBillingManager();
            $this->checkPermission($owner);
            $this->billingManager->run();
        } catch (Exception $e) {
            if ($isAJAX) {
                echo Response::asJson(
                    $e->data, 503, 'Service Unavailable', $e->getMessage()
                );
            } else {
                echo '<div style="color: red">'.$e->getMessage().'</div>';
            }

            if(SELECTOR_DEBUG && !$isAJAX) {
                echo '<pre>'.$e->getTraceAsString().'</pre>';
            }
        }
    }

    /**
     * Checks permission of executing script.
     *
     * @param string $owner
     *
     * @throws \Exception
     */
    public function checkPermission($owner)
    {
        if ($owner == self::OWNER_ADMIN && !$this->billingManager->isAdmin()) {
            include 'warning-message.html';
            throw new Exception('');
        }
        $this->owner = $owner;
    }

    /**
     * @param $billing
     * @throws \Exception
     */
    private function setBilling($billing)
    {
        $availableBilling = array(
            self::BILLING_SPA,
        );

        if(!in_array($billing, $availableBilling)) {
            throw new Exception('Undefined billing system '.$billing);
        }

        $this->billing = $billing;
    }

    /**
     * @return mixed
     */
    public function getBilling()
    {
        return $this->billing;
    }

    /**
     * Get param from $_GET variable
     *
     * @param $key
     * @param null $default
     * @return null
     */
    public function getParam($key, $default = null)
    {
        return isset($_GET[$key]) ? $_GET[$key] : $default;
    }

    /**
     * Get param from $_POST variable
     *
     * @param $key
     * @param null $default
     * @return null
     */
    public function getPost($key, $default = null)
    {
        return isset($_POST[$key]) ? $_POST[$key] : $default;
    }

    public function hasParam($key)
    {
        return isset($_REQUEST[$key]);
    }

    /**
     * Get billing system manager
     */
    private function getBillingManager()
    {
        switch($this->getBilling()) {
            case self::BILLING_SPA:
                $this->billingManager = new SpaManager();
                break;
        }
    }

    /**
     * Class loader
     *
     * @param string $className
     * @return Base
     */
    public static function load($className = __CLASS__)
    {
        if(isset(self::$_models[$className])) {
            return self::$_models[$className];
        } else {
            self::$_models[$className] = new $className;
            return self::$_models[$className];
        }
    }

    /**
     * @return string
     */
    public function getOwner()
    {
        return $this->owner;
    }

    /**
     * @return string
     */
    public function getAppMode()
    {
        $modeFile = '/usr/share/l.v.e-manager/spa/app_mode.status';
        if (file_exists($modeFile)) {
            return trim(file_get_contents($modeFile));
        }
        return self::APP_MODE;
    }
}