<?php
namespace TYPO3\CMS\Core\Core;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Utility\MathUtility;

/**
 * This class encapsulates bootstrap related methods.
 * It is required directly as the very first thing in entry scripts and
 * used to define all base things like constants and paths and so on.
 *
 * Most methods in this class have dependencies to each other. They can
 * not be called in arbitrary order. The methods are ordered top down, so
 * a method at the beginning has lower dependencies than a method further
 * down. Do not fiddle with the load order in own scripts except you know
 * exactly what you are doing!
 */
class Bootstrap
{
    /**
     * @var \TYPO3\CMS\Core\Core\Bootstrap
     */
    protected static $instance = null;

    /**
     * Unique Request ID
     *
     * @var string
     */
    protected $requestId;

    /**
     * The application context
     *
     * @var \TYPO3\CMS\Core\Core\ApplicationContext
     */
    protected $applicationContext;

    /**
     * @var array List of early instances
     */
    protected $earlyInstances = [];

    /**
     * @var string Path to install tool
     */
    protected $installToolPath;

    /**
     * A list of all registered request handlers, see the Application class / entry points for the registration
     * @var \TYPO3\CMS\Core\Http\RequestHandlerInterface[]|\TYPO3\CMS\Core\Console\RequestHandlerInterface[]
     */
    protected $availableRequestHandlers = [];

    /**
     * The Response object when using Request/Response logic
     * @var \Psr\Http\Message\ResponseInterface
     * @see shutdown()
     */
    protected $response;

    /**
     * @var bool
     */
    protected static $usesComposerClassLoading = false;

    /**
     * Disable direct creation of this object.
     * Set unique requestId and the application context
     *
     * @var string Application context
     */
    protected function __construct($applicationContext)
    {
        $this->requestId = substr(md5(uniqid('', true)), 0, 13);
        $this->applicationContext = new ApplicationContext($applicationContext);
    }

    /**
     * @return bool
     */
    public static function usesComposerClassLoading()
    {
        return self::$usesComposerClassLoading;
    }

    /**
     * Disable direct cloning of this object.
     */
    protected function __clone()
    {
    }

    /**
     * Return 'this' as singleton
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public static function getInstance()
    {
        if (is_null(static::$instance)) {
            $applicationContext = getenv('TYPO3_CONTEXT') ?: (getenv('REDIRECT_TYPO3_CONTEXT') ?: 'Production');
            self::$instance = new static($applicationContext);
            self::$instance->defineTypo3RequestTypes();
        }
        return static::$instance;
    }

    /**
     * Gets the request's unique ID
     *
     * @return string Unique request ID
     * @internal This is not a public API method, do not use in own extensions
     */
    public function getRequestId()
    {
        return $this->requestId;
    }

    /**
     * Returns the application context this bootstrap was started in.
     *
     * @return \TYPO3\CMS\Core\Core\ApplicationContext The application context encapsulated in an object
     * @internal This is not a public API method, do not use in own extensions.
     * Use \TYPO3\CMS\Core\Utility\GeneralUtility::getApplicationContext() instead
     */
    public function getApplicationContext()
    {
        return $this->applicationContext;
    }

    /**
     * Prevent any unwanted output that may corrupt AJAX/compression.
     * This does not interfere with "die()" or "echo"+"exit()" messages!
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function startOutputBuffering()
    {
        ob_start();
        return $this;
    }

    /**
     * Main entry point called at every request usually from Global scope. Checks if everything is correct,
     * and loads the Configuration.
     *
     * Make sure that the baseSetup() is called before and the class loader is present
     *
     * @return Bootstrap
     */
    public function configure()
    {
        $this->startOutputBuffering()
            ->loadConfigurationAndInitialize()
            ->loadTypo3LoadedExtAndExtLocalconf(true)
            ->setFinalCachingFrameworkCacheConfiguration()
            ->defineLoggingAndExceptionConstants()
            ->unsetReservedGlobalVariables()
            ->initializeTypo3DbGlobal();
        if (empty($GLOBALS['TYPO3_CONF_VARS']['SYS']['encryptionKey'])) {
            throw new \RuntimeException(
                'TYPO3 Encryption is empty. $GLOBALS[\'TYPO3_CONF_VARS\'][\'SYS\'][\'encryptionKey\'] needs to be set for TYPO3 to work securely',
                1502987245
            );
        }
        return $this;
    }

    /**
     * Run the base setup that checks server environment, determines paths,
     * populates base files and sets common configuration.
     *
     * Script execution will be aborted if something fails here.
     *
     * @param int $entryPointLevel Number of subdirectories where the entry script is located under the document root
     * @return Bootstrap
     * @throws \RuntimeException when TYPO3_REQUESTTYPE was not set before, setRequestType() needs to be called before
     * @internal This is not a public API method, do not use in own extensions
     */
    public function baseSetup($entryPointLevel = 0)
    {
        if (!defined('TYPO3_REQUESTTYPE')) {
            throw new \RuntimeException('No Request Type was set, TYPO3 does not know in which context it is run.', 1450561838);
        }
        SystemEnvironmentBuilder::run($entryPointLevel);
        if (!self::$usesComposerClassLoading && ClassLoadingInformation::isClassLoadingInformationAvailable()) {
            ClassLoadingInformation::registerClassLoadingInformation();
        }
        GeneralUtility::presetApplicationContext($this->applicationContext);
        return $this;
    }

    /**
     * Sets the class loader to the bootstrap
     *
     * @param \Composer\Autoload\ClassLoader $classLoader an instance of the class loader
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function initializeClassLoader($classLoader)
    {
        $this->setEarlyInstance(\Composer\Autoload\ClassLoader::class, $classLoader);
        if (defined('TYPO3_COMPOSER_MODE') && TYPO3_COMPOSER_MODE) {
            self::$usesComposerClassLoading = true;
        }
        return $this;
    }

    /**
     * checks if LocalConfiguration.php or PackageStates.php is missing,
     * used to see if a redirect to the install tool is needed
     *
     * @return bool TRUE when the essential configuration is available, otherwise FALSE
     * @internal This is not a public API method, do not use in own extensions
     */
    public function checkIfEssentialConfigurationExists()
    {
        $configurationManager = new \TYPO3\CMS\Core\Configuration\ConfigurationManager;
        $this->setEarlyInstance(\TYPO3\CMS\Core\Configuration\ConfigurationManager::class, $configurationManager);
        return file_exists($configurationManager->getLocalConfigurationFileLocation()) && file_exists(PATH_typo3conf . 'PackageStates.php');
    }

    /**
     * Redirect to install tool if LocalConfiguration.php is missing.
     *
     * @param int $entryPointLevel Number of subdirectories where the entry script is located under the document root
     * @internal This is not a public API method, do not use in own extensions
     */
    public function redirectToInstallTool($entryPointLevel = 0)
    {
        $path = TYPO3_mainDir . 'install.php';
        if ($entryPointLevel > 0) {
            $path = str_repeat('../', $entryPointLevel) . $path;
        }
        header('Location: ' . $path);
        die;
    }

    /**
     * Adds available request handlers usually done via an application from the outside.
     *
     * @param string $requestHandler class which implements the request handler interface
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function registerRequestHandlerImplementation($requestHandler)
    {
        $this->availableRequestHandlers[] = $requestHandler;
        return $this;
    }

    /**
     * Fetches the request handler that suits the best based on the priority and the interface
     * Be sure to always have the constants that are defined in $this->defineTypo3RequestTypes() are set,
     * so most RequestHandlers can check if they can handle the request.
     *
     * @param \Psr\Http\Message\ServerRequestInterface|\Symfony\Component\Console\Input\InputInterface $request
     * @return \TYPO3\CMS\Core\Http\RequestHandlerInterface|\TYPO3\CMS\Core\Console\RequestHandlerInterface
     * @throws \TYPO3\CMS\Core\Exception
     * @internal This is not a public API method, do not use in own extensions
     */
    protected function resolveRequestHandler($request)
    {
        $suitableRequestHandlers = [];
        foreach ($this->availableRequestHandlers as $requestHandlerClassName) {
            /** @var \TYPO3\CMS\Core\Http\RequestHandlerInterface|\TYPO3\CMS\Core\Console\RequestHandlerInterface $requestHandler */
            $requestHandler = GeneralUtility::makeInstance($requestHandlerClassName, $this);
            if ($requestHandler->canHandleRequest($request)) {
                $priority = $requestHandler->getPriority();
                if (isset($suitableRequestHandlers[$priority])) {
                    throw new \TYPO3\CMS\Core\Exception('More than one request handler with the same priority can handle the request, but only one handler may be active at a time!', 1176471352);
                }
                $suitableRequestHandlers[$priority] = $requestHandler;
            }
        }
        if (empty($suitableRequestHandlers)) {
            throw new \TYPO3\CMS\Core\Exception('No suitable request handler found.', 1225418233);
        }
        ksort($suitableRequestHandlers);
        return array_pop($suitableRequestHandlers);
    }

    /**
     * Builds a Request instance from the current process, and then resolves the request
     * through the request handlers depending on Frontend, Backend, CLI etc.
     *
     * @param \Psr\Http\Message\RequestInterface|\Symfony\Component\Console\Input\InputInterface $request
     * @return Bootstrap
     * @throws \TYPO3\CMS\Core\Exception
     * @internal This is not a public API method, do not use in own extensions
     */
    public function handleRequest($request)
    {
        // Resolve request handler that were registered based on the Application
        $requestHandler = $this->resolveRequestHandler($request);

        // Execute the command which returns a Response object or NULL
        $this->response = $requestHandler->handleRequest($request);
        return $this;
    }

    /**
     * Outputs content if there is a proper Response object.
     *
     * @return Bootstrap
     */
    protected function sendResponse()
    {
        if ($this->response instanceof \Psr\Http\Message\ResponseInterface) {
            if (!headers_sent()) {
                // If the response code was not changed by legacy code (still is 200)
                // then allow the PSR-7 response object to explicitly set it.
                // Otherwise let legacy code take precedence.
                // This code path can be deprecated once we expose the response object to third party code
                if (http_response_code() === 200) {
                    header('HTTP/' . $this->response->getProtocolVersion() . ' ' . $this->response->getStatusCode() . ' ' . $this->response->getReasonPhrase());
                }

                foreach ($this->response->getHeaders() as $name => $values) {
                    header($name . ': ' . implode(', ', $values));
                }
            }
            echo $this->response->getBody()->__toString();
        }
        return $this;
    }

    /**
     * Registers the instance of the specified object for an early boot stage.
     * On finalizing the Object Manager initialization, all those instances will
     * be transferred to the Object Manager's registry.
     *
     * @param string $objectName Object name, as later used by the Object Manager
     * @param object $instance The instance to register
     * @internal This is not a public API method, do not use in own extensions
     */
    public function setEarlyInstance($objectName, $instance)
    {
        $this->earlyInstances[$objectName] = $instance;
    }

    /**
     * Returns an instance which was registered earlier through setEarlyInstance()
     *
     * @param string $objectName Object name of the registered instance
     * @return object
     * @throws \TYPO3\CMS\Core\Exception
     * @internal This is not a public API method, do not use in own extensions
     */
    public function getEarlyInstance($objectName)
    {
        if (!isset($this->earlyInstances[$objectName])) {
            throw new \TYPO3\CMS\Core\Exception('Unknown early instance "' . $objectName . '"', 1365167380);
        }
        return $this->earlyInstances[$objectName];
    }

    /**
     * Returns all registered early instances indexed by object name
     *
     * @return array
     * @internal This is not a public API method, do not use in own extensions
     */
    public function getEarlyInstances()
    {
        return $this->earlyInstances;
    }

    /**
     * Includes LocalConfiguration.php and sets several
     * global settings depending on configuration.
     *
     * @param bool $allowCaching Whether to allow caching - affects cache_core (autoloader)
     * @param string $packageManagerClassName Define an alternative package manager implementation (usually for the installer)
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function loadConfigurationAndInitialize($allowCaching = true, $packageManagerClassName = \TYPO3\CMS\Core\Package\PackageManager::class)
    {
        $this->populateLocalConfiguration()
            ->initializeErrorHandling();
        if (!$allowCaching) {
            $this->disableCoreCache();
        }
        $this->initializeCachingFramework()
            ->initializePackageManagement($packageManagerClassName)
            ->initializeRuntimeActivatedPackagesFromConfiguration()
            ->defineUserAgentConstant()
            ->registerExtDirectComponents()
            ->setCacheHashOptions()
            ->setDefaultTimezone()
            ->initializeL10nLocales()
            ->setMemoryLimit();
        if ($allowCaching) {
            $this->ensureClassLoadingInformationExists();
        }
        return $this;
    }

    /**
     * Initializes the package system and loads the package configuration and settings
     * provided by the packages.
     *
     * @param string $packageManagerClassName Define an alternative package manager implementation (usually for the installer)
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function initializePackageManagement($packageManagerClassName)
    {
        /** @var \TYPO3\CMS\Core\Package\PackageManager $packageManager */
        $packageManager = new $packageManagerClassName();
        $this->setEarlyInstance(\TYPO3\CMS\Core\Package\PackageManager::class, $packageManager);
        ExtensionManagementUtility::setPackageManager($packageManager);
        $packageManager->injectCoreCache($this->getEarlyInstance(\TYPO3\CMS\Core\Cache\CacheManager::class)->getCache('cache_core'));
        $dependencyResolver = GeneralUtility::makeInstance(\TYPO3\CMS\Core\Package\DependencyResolver::class);
        $dependencyResolver->injectDependencyOrderingService(GeneralUtility::makeInstance(\TYPO3\CMS\Core\Service\DependencyOrderingService::class));
        $packageManager->injectDependencyResolver($dependencyResolver);
        $packageManager->initialize();
        GeneralUtility::setSingletonInstance(\TYPO3\CMS\Core\Package\PackageManager::class, $packageManager);
        return $this;
    }

    /**
     * Writes class loading information if not yet present
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     * @deprecated since TYPO3 v8, will be removed in TYPO3 v9. Use the Install Tool to dump autoload information.
     */
    public function ensureClassLoadingInformationExists()
    {
        if (!self::$usesComposerClassLoading && !ClassLoadingInformation::isClassLoadingInformationAvailable()) {
            GeneralUtility::logDeprecatedFunction();
            ClassLoadingInformation::dumpClassLoadingInformation();
            ClassLoadingInformation::registerClassLoadingInformation();
        }
        return $this;
    }

    /**
     * Activates a package during runtime. This is used in AdditionalConfiguration.php
     * to enable extensions under conditions.
     *
     * @return Bootstrap
     */
    protected function initializeRuntimeActivatedPackagesFromConfiguration()
    {
        if (!empty($GLOBALS['TYPO3_CONF_VARS']['EXT']['runtimeActivatedPackages']) && is_array($GLOBALS['TYPO3_CONF_VARS']['EXT']['runtimeActivatedPackages'])) {
            /** @var \TYPO3\CMS\Core\Package\PackageManager $packageManager */
            $packageManager = $this->getEarlyInstance(\TYPO3\CMS\Core\Package\PackageManager::class);
            foreach ($GLOBALS['TYPO3_CONF_VARS']['EXT']['runtimeActivatedPackages'] as $runtimeAddedPackageKey) {
                $packageManager->activatePackageDuringRuntime($runtimeAddedPackageKey);
            }
        }
        return $this;
    }

    /**
     * Load ext_localconf of extensions
     *
     * @param bool $allowCaching
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function loadTypo3LoadedExtAndExtLocalconf($allowCaching = true)
    {
        ExtensionManagementUtility::loadExtLocalconf($allowCaching);
        return $this;
    }

    /**
     * We need an early instance of the configuration manager.
     * Since makeInstance relies on the object configuration, we create it here with new instead.
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function populateLocalConfiguration()
    {
        try {
            $configurationManager = $this->getEarlyInstance(\TYPO3\CMS\Core\Configuration\ConfigurationManager::class);
        } catch (\TYPO3\CMS\Core\Exception $exception) {
            $configurationManager = new \TYPO3\CMS\Core\Configuration\ConfigurationManager();
            $this->setEarlyInstance(\TYPO3\CMS\Core\Configuration\ConfigurationManager::class, $configurationManager);
        }
        $configurationManager->exportConfiguration();
        return $this;
    }

    /**
     * Set cache_core to null backend, effectively disabling eg. the cache for ext_localconf and PackageManager etc.
     *
     * @return \TYPO3\CMS\Core\Core\Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function disableCoreCache()
    {
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['cache_core']['backend']
            = \TYPO3\CMS\Core\Cache\Backend\NullBackend::class;
        unset($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['cache_core']['options']);
        return $this;
    }

    /**
     * Define user agent constant
     *
     * @return \TYPO3\CMS\Core\Core\Bootstrap
     */
    protected function defineUserAgentConstant()
    {
        define('TYPO3_user_agent', 'User-Agent: ' . $GLOBALS['TYPO3_CONF_VARS']['HTTP']['headers']['User-Agent']);
        return $this;
    }

    /**
     * Register default ExtDirect components
     *
     * @return Bootstrap
     */
    protected function registerExtDirectComponents()
    {
        if (TYPO3_MODE === 'BE') {
            ExtensionManagementUtility::registerExtDirectComponent(
                'TYPO3.Components.PageTree.DataProvider',
                \TYPO3\CMS\Backend\Tree\Pagetree\ExtdirectTreeDataProvider::class
            );
            ExtensionManagementUtility::registerExtDirectComponent(
                'TYPO3.Components.PageTree.Commands',
                \TYPO3\CMS\Backend\Tree\Pagetree\ExtdirectTreeCommands::class
            );
        }
        return $this;
    }

    /**
     * Initialize caching framework, and re-initializes it (e.g. in the install tool) by recreating the instances
     * again despite the Singleton instance
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function initializeCachingFramework()
    {
        $cacheManager = new \TYPO3\CMS\Core\Cache\CacheManager();
        $cacheManager->setCacheConfigurations($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']);
        GeneralUtility::setSingletonInstance(\TYPO3\CMS\Core\Cache\CacheManager::class, $cacheManager);
        $this->setEarlyInstance(\TYPO3\CMS\Core\Cache\CacheManager::class, $cacheManager);
        return $this;
    }

    /**
     * Set cacheHash options
     *
     * @return Bootstrap
     */
    protected function setCacheHashOptions()
    {
        $GLOBALS['TYPO3_CONF_VARS']['FE']['cacheHash'] = [
            'cachedParametersWhiteList' => GeneralUtility::trimExplode(',', $GLOBALS['TYPO3_CONF_VARS']['FE']['cHashOnlyForParameters'], true),
            'excludedParameters' => GeneralUtility::trimExplode(',', $GLOBALS['TYPO3_CONF_VARS']['FE']['cHashExcludedParameters'], true),
            'requireCacheHashPresenceParameters' => GeneralUtility::trimExplode(',', $GLOBALS['TYPO3_CONF_VARS']['FE']['cHashRequiredParameters'], true),
        ];
        if (trim($GLOBALS['TYPO3_CONF_VARS']['FE']['cHashExcludedParametersIfEmpty']) === '*') {
            $GLOBALS['TYPO3_CONF_VARS']['FE']['cacheHash']['excludeAllEmptyParameters'] = true;
        } else {
            $GLOBALS['TYPO3_CONF_VARS']['FE']['cacheHash']['excludedParametersIfEmpty'] = GeneralUtility::trimExplode(',', $GLOBALS['TYPO3_CONF_VARS']['FE']['cHashExcludedParametersIfEmpty'], true);
        }
        return $this;
    }

    /**
     * Set default timezone
     *
     * @return Bootstrap
     */
    protected function setDefaultTimezone()
    {
        $timeZone = $GLOBALS['TYPO3_CONF_VARS']['SYS']['phpTimeZone'];
        if (empty($timeZone)) {
            // Time zone from the server environment (TZ env or OS query)
            $defaultTimeZone = @date_default_timezone_get();
            if ($defaultTimeZone !== '') {
                $timeZone = $defaultTimeZone;
            } else {
                $timeZone = 'UTC';
            }
        }
        // Set default to avoid E_WARNINGs with PHP > 5.3
        date_default_timezone_set($timeZone);
        return $this;
    }

    /**
     * Initialize the locales handled by TYPO3
     *
     * @return Bootstrap
     */
    protected function initializeL10nLocales()
    {
        \TYPO3\CMS\Core\Localization\Locales::initialize();
        return $this;
    }

    /**
     * Configure and set up exception and error handling
     *
     * @return Bootstrap
     * @throws \RuntimeException
     */
    protected function initializeErrorHandling()
    {
        $productionExceptionHandlerClassName = $GLOBALS['TYPO3_CONF_VARS']['SYS']['productionExceptionHandler'];
        $debugExceptionHandlerClassName = $GLOBALS['TYPO3_CONF_VARS']['SYS']['debugExceptionHandler'];

        $errorHandlerClassName = $GLOBALS['TYPO3_CONF_VARS']['SYS']['errorHandler'];
        $errorHandlerErrors = $GLOBALS['TYPO3_CONF_VARS']['SYS']['errorHandlerErrors'];
        $exceptionalErrors = $GLOBALS['TYPO3_CONF_VARS']['SYS']['exceptionalErrors'];

        $displayErrorsSetting = (int)$GLOBALS['TYPO3_CONF_VARS']['SYS']['displayErrors'];
        switch ($displayErrorsSetting) {
            case -1:
                $ipMatchesDevelopmentSystem = GeneralUtility::cmpIP(GeneralUtility::getIndpEnv('REMOTE_ADDR'), $GLOBALS['TYPO3_CONF_VARS']['SYS']['devIPmask']);
                $exceptionHandlerClassName = $ipMatchesDevelopmentSystem ? $debugExceptionHandlerClassName : $productionExceptionHandlerClassName;
                $displayErrors = $ipMatchesDevelopmentSystem ? 1 : 0;
                $exceptionalErrors = $ipMatchesDevelopmentSystem ? $exceptionalErrors : 0;
                break;
            case 0:
                $exceptionHandlerClassName = $productionExceptionHandlerClassName;
                $displayErrors = 0;
                break;
            case 1:
                $exceptionHandlerClassName = $debugExceptionHandlerClassName;
                $displayErrors = 1;
                break;
            default:
                // Throw exception if an invalid option is set.
                throw new \RuntimeException(
                    'The option $TYPO3_CONF_VARS[SYS][displayErrors] is not set to "-1", "0" or "1".',
                    1476046290
                );
        }
        @ini_set('display_errors', $displayErrors);

        if (!empty($errorHandlerClassName)) {
            // Register an error handler for the given errorHandlerError
            $errorHandler = GeneralUtility::makeInstance($errorHandlerClassName, $errorHandlerErrors);
            $errorHandler->setExceptionalErrors($exceptionalErrors);
            if (is_callable([$errorHandler, 'setDebugMode'])) {
                $errorHandler->setDebugMode($displayErrors === 1);
            }
        }
        if (!empty($exceptionHandlerClassName)) {
            // Registering the exception handler is done in the constructor
            GeneralUtility::makeInstance($exceptionHandlerClassName);
        }
        return $this;
    }

    /**
     * Set PHP memory limit depending on value of
     * $GLOBALS['TYPO3_CONF_VARS']['SYS']['setMemoryLimit']
     *
     * @return Bootstrap
     */
    protected function setMemoryLimit()
    {
        if ((int)$GLOBALS['TYPO3_CONF_VARS']['SYS']['setMemoryLimit'] > 16) {
            @ini_set('memory_limit', ((int)$GLOBALS['TYPO3_CONF_VARS']['SYS']['setMemoryLimit'] . 'm'));
        }
        return $this;
    }

    /**
     * Define TYPO3_REQUESTTYPE* constants that can be used for developers to see if any context has been hit
     * also see setRequestType(). Is done at the very beginning so these parameters are always available.
     *
     * @return Bootstrap
     */
    protected function defineTypo3RequestTypes()
    {
        define('TYPO3_REQUESTTYPE_FE', 1);
        define('TYPO3_REQUESTTYPE_BE', 2);
        define('TYPO3_REQUESTTYPE_CLI', 4);
        define('TYPO3_REQUESTTYPE_AJAX', 8);
        define('TYPO3_REQUESTTYPE_INSTALL', 16);
    }

    /**
     * Defines the TYPO3_REQUESTTYPE constant so the environment knows which context the request is running.
     *
     * @throws \RuntimeException if the method was already called during a request
     * @return Bootstrap
     */
    public function setRequestType($requestType)
    {
        if (defined('TYPO3_REQUESTTYPE')) {
            throw new \RuntimeException('TYPO3_REQUESTTYPE has already been set, cannot be called multiple times', 1450561878);
        }
        define('TYPO3_REQUESTTYPE', $requestType);
        return $this;
    }

    /**
     * Extensions may register new caches, so we set the
     * global cache array to the manager again at this point
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function setFinalCachingFrameworkCacheConfiguration()
    {
        $this->getEarlyInstance(\TYPO3\CMS\Core\Cache\CacheManager::class)->setCacheConfigurations($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']);
        return $this;
    }

    /**
     * Define logging and exception constants
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function defineLoggingAndExceptionConstants()
    {
        define('TYPO3_DLOG', $GLOBALS['TYPO3_CONF_VARS']['SYS']['enable_DLOG']);
        define('TYPO3_ERROR_DLOG', $GLOBALS['TYPO3_CONF_VARS']['SYS']['enable_errorDLOG']);
        define('TYPO3_EXCEPTION_DLOG', $GLOBALS['TYPO3_CONF_VARS']['SYS']['enable_exceptionDLOG']);
        return $this;
    }

    /**
     * Unsetting reserved global variables:
     * Those are set in "ext:core/ext_tables.php" file:
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function unsetReservedGlobalVariables()
    {
        unset($GLOBALS['PAGES_TYPES']);
        unset($GLOBALS['TCA']);
        unset($GLOBALS['TBE_MODULES']);
        unset($GLOBALS['TBE_STYLES']);
        unset($GLOBALS['BE_USER']);
        // Those set otherwise:
        unset($GLOBALS['TBE_MODULES_EXT']);
        unset($GLOBALS['TCA_DESCR']);
        unset($GLOBALS['LOCAL_LANG']);
        return $this;
    }

    /**
     * Initialize database connection in $GLOBALS and connect if requested
     *
     * @return \TYPO3\CMS\Core\Core\Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function initializeTypo3DbGlobal()
    {
        /** @var $databaseConnection \TYPO3\CMS\Core\Database\DatabaseConnection */
        $databaseConnection = GeneralUtility::makeInstance(\TYPO3\CMS\Core\Database\DatabaseConnection::class);
        $databaseConnection->setDatabaseName(
            $GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['dbname'] ?? ''
        );
        $databaseConnection->setDatabaseUsername(
            $GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['user'] ?? ''
        );
        $databaseConnection->setDatabasePassword(
            $GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['password'] ?? ''
        );

        $databaseHost = $GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['host'] ?? '';
        if (isset($GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['port'])) {
            $databaseConnection->setDatabasePort($GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['port']);
        } elseif (strpos($databaseHost, ':') > 0) {
            // @TODO: Find a way to handle this case in the install tool and drop this
            list($databaseHost, $databasePort) = explode(':', $databaseHost);
            $databaseConnection->setDatabasePort($databasePort);
        }
        if (isset($GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['unix_socket'])) {
            $databaseConnection->setDatabaseSocket(
                $GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['unix_socket']
            );
        }
        $databaseConnection->setDatabaseHost($databaseHost);

        $databaseConnection->debugOutput = $GLOBALS['TYPO3_CONF_VARS']['SYS']['sqlDebug'];

        if (isset($GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['persistentConnection'])
            && $GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['persistentConnection']
        ) {
            $databaseConnection->setPersistentDatabaseConnection(true);
        }

        $isDatabaseHostLocalHost = in_array($databaseHost, ['localhost', '127.0.0.1', '::1'], true);
        if (isset($GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['driverOptions'])
            && $GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['driverOptions'] & MYSQLI_CLIENT_COMPRESS
            && !$isDatabaseHostLocalHost
        ) {
            $databaseConnection->setConnectionCompression(true);
        }

        if (!empty($GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['initCommands'])) {
            $commandsAfterConnect = GeneralUtility::trimExplode(
                LF,
                str_replace(
                    '\' . LF . \'',
                    LF,
                    $GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['initCommands']
                ),
                true
            );
            $databaseConnection->setInitializeCommandsAfterConnect($commandsAfterConnect);
        }

        $GLOBALS['TYPO3_DB'] = $databaseConnection;
        // $GLOBALS['TYPO3_DB'] needs to be defined first in order to work for DBAL
        $GLOBALS['TYPO3_DB']->initialize();

        return $this;
    }

    /**
     * Check adminOnly configuration variable and redirects
     * to an URL in file typo3conf/LOCK_BACKEND or exit the script
     *
     * @throws \RuntimeException
     * @param bool $forceProceeding if this option is set, the bootstrap will proceed even if the user is logged in (usually only needed for special AJAX cases, see AjaxRequestHandler)
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function checkLockedBackendAndRedirectOrDie($forceProceeding = false)
    {
        if ($GLOBALS['TYPO3_CONF_VARS']['BE']['adminOnly'] < 0) {
            throw new \RuntimeException('TYPO3 Backend locked: Backend and Install Tool are locked for maintenance. [BE][adminOnly] is set to "' . (int)$GLOBALS['TYPO3_CONF_VARS']['BE']['adminOnly'] . '".', 1294586847);
        }
        if (@is_file(PATH_typo3conf . 'LOCK_BACKEND') && $forceProceeding === false) {
            $fileContent = file_get_contents(PATH_typo3conf . 'LOCK_BACKEND');
            if ($fileContent) {
                header('Location: ' . $fileContent);
            } else {
                throw new \RuntimeException('TYPO3 Backend locked: Browser backend is locked for maintenance. Remove lock by removing the file "typo3conf/LOCK_BACKEND" or use CLI-scripts.', 1294586848);
            }
            die;
        }
        return $this;
    }

    /**
     * Compare client IP with IPmaskList and exit the script run
     * if the client is not allowed to access the backend
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     * @throws \RuntimeException
     */
    public function checkBackendIpOrDie()
    {
        if (trim($GLOBALS['TYPO3_CONF_VARS']['BE']['IPmaskList'])) {
            if (!GeneralUtility::cmpIP(GeneralUtility::getIndpEnv('REMOTE_ADDR'), $GLOBALS['TYPO3_CONF_VARS']['BE']['IPmaskList'])) {
                throw new \RuntimeException('TYPO3 Backend access denied: The IP address of your client does not match the list of allowed IP addresses.', 1389265900);
            }
        }
        return $this;
    }

    /**
     * Check lockSSL configuration variable and redirect
     * to https version of the backend if needed
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     * @throws \RuntimeException
     */
    public function checkSslBackendAndRedirectIfNeeded()
    {
        if ((bool)$GLOBALS['TYPO3_CONF_VARS']['BE']['lockSSL'] && !GeneralUtility::getIndpEnv('TYPO3_SSL')) {
            if ((int)$GLOBALS['TYPO3_CONF_VARS']['BE']['lockSSLPort']) {
                $sslPortSuffix = ':' . (int)$GLOBALS['TYPO3_CONF_VARS']['BE']['lockSSLPort'];
            } else {
                $sslPortSuffix = '';
            }
            list(, $url) = explode('://', GeneralUtility::getIndpEnv('TYPO3_SITE_URL') . TYPO3_mainDir, 2);
            list($server, $address) = explode('/', $url, 2);
            header('Location: https://' . $server . $sslPortSuffix . '/' . $address);
            die;
        }
        return $this;
    }

    /**
     * Load ext_tables and friends.
     *
     * This will mainly set up $TCA and several other global arrays
     * through API's like extMgm.
     * Executes ext_tables.php files of loaded extensions or the
     * according cache file if exists.
     *
     * @param bool $allowCaching True, if reading compiled ext_tables file from cache is allowed
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     * @deprecated since TYPO3 v8, will be removed in TYPO3 v9
     */
    public function loadExtensionTables($allowCaching = true)
    {
        GeneralUtility::logDeprecatedFunction();
        $this->loadBaseTca($allowCaching)->loadExtTables($allowCaching);
        return $this;
    }

    /**
     * Load $TCA
     *
     * This will mainly set up $TCA through extMgm API.
     *
     * @param bool $allowCaching True, if loading TCA from cache is allowed
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function loadBaseTca(bool $allowCaching = true): Bootstrap
    {
        ExtensionManagementUtility::loadBaseTca($allowCaching);
        return $this;
    }

    /**
     * Load ext_tables and friends.
     *
     * This will mainly load and execute ext_tables.php files of loaded extensions
     * or the according cache file if exists.
     *
     * @param bool $allowCaching True, if reading compiled ext_tables file from cache is allowed
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function loadExtTables(bool $allowCaching = true): Bootstrap
    {
        ExtensionManagementUtility::loadExtTables($allowCaching);
        $this->runExtTablesPostProcessingHooks();
        return $this;
    }

    /**
     * Check for registered ext tables hooks and run them
     *
     * @throws \UnexpectedValueException
     */
    protected function runExtTablesPostProcessingHooks()
    {
        if (is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['GLOBAL']['extTablesInclusion-PostProcessing'])) {
            foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['GLOBAL']['extTablesInclusion-PostProcessing'] as $classReference) {
                /** @var $hookObject \TYPO3\CMS\Core\Database\TableConfigurationPostProcessingHookInterface */
                $hookObject = GeneralUtility::getUserObj($classReference);
                if (!$hookObject instanceof \TYPO3\CMS\Core\Database\TableConfigurationPostProcessingHookInterface) {
                    throw new \UnexpectedValueException(
                        '$hookObject "' . $classReference . '" must implement interface TYPO3\\CMS\\Core\\Database\\TableConfigurationPostProcessingHookInterface',
                        1320585902
                    );
                }
                $hookObject->processData();
            }
        }
    }

    /**
     * Initialize the Routing for the TYPO3 Backend
     * Loads all routes registered inside all packages and stores them inside the Router
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function initializeBackendRouter()
    {
        // See if the Routes.php from all active packages have been built together already
        $cacheIdentifier = 'BackendRoutesFromPackages_' . sha1((TYPO3_version . PATH_site . 'BackendRoutesFromPackages'));

        /** @var $codeCache \TYPO3\CMS\Core\Cache\Frontend\PhpFrontend */
        $codeCache = $this->getEarlyInstance(\TYPO3\CMS\Core\Cache\CacheManager::class)->getCache('cache_core');
        $routesFromPackages = [];
        if ($codeCache->has($cacheIdentifier)) {
            // substr is necessary, because the php frontend wraps php code around the cache value
            $routesFromPackages = unserialize(substr($codeCache->get($cacheIdentifier), 6, -2));
        } else {
            // Loop over all packages and check for a Configuration/Backend/Routes.php file
            $packageManager = $this->getEarlyInstance(\TYPO3\CMS\Core\Package\PackageManager::class);
            $packages = $packageManager->getActivePackages();
            foreach ($packages as $package) {
                $routesFileNameForPackage = $package->getPackagePath() . 'Configuration/Backend/Routes.php';
                if (file_exists($routesFileNameForPackage)) {
                    $definedRoutesInPackage = require $routesFileNameForPackage;
                    if (is_array($definedRoutesInPackage)) {
                        $routesFromPackages = array_merge($routesFromPackages, $definedRoutesInPackage);
                    }
                }
                $routesFileNameForPackage = $package->getPackagePath() . 'Configuration/Backend/AjaxRoutes.php';
                if (file_exists($routesFileNameForPackage)) {
                    $definedRoutesInPackage = require $routesFileNameForPackage;
                    if (is_array($definedRoutesInPackage)) {
                        foreach ($definedRoutesInPackage as $routeIdentifier => $routeOptions) {
                            // prefix the route with "ajax_" as "namespace"
                            $routeOptions['path'] = '/ajax' . $routeOptions['path'];
                            $routesFromPackages['ajax_' . $routeIdentifier] = $routeOptions;
                            $routesFromPackages['ajax_' . $routeIdentifier]['ajax'] = true;
                        }
                    }
                }
            }
            // Store the data from all packages in the cache
            $codeCache->set($cacheIdentifier, serialize($routesFromPackages));
        }

        // Build Route objects from the data
        $router = GeneralUtility::makeInstance(\TYPO3\CMS\Backend\Routing\Router::class);
        foreach ($routesFromPackages as $name => $options) {
            $path = $options['path'];
            unset($options['path']);
            $route = GeneralUtility::makeInstance(\TYPO3\CMS\Backend\Routing\Route::class, $path, $options);
            $router->addRoute($name, $route);
        }
        return $this;
    }

    /**
     * Initialize backend user object in globals
     *
     * @param string $className usually \TYPO3\CMS\Core\Authentication\BackendUserAuthentication::class but can be used for CLI
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function initializeBackendUser($className = \TYPO3\CMS\Core\Authentication\BackendUserAuthentication::class)
    {
        /** @var $backendUser \TYPO3\CMS\Core\Authentication\BackendUserAuthentication */
        $backendUser = GeneralUtility::makeInstance($className);
        // The global must be available very early, because methods below
        // might trigger code which relies on it. See: #45625
        $GLOBALS['BE_USER'] = $backendUser;
        $backendUser->start();
        return $this;
    }

    /**
     * Initializes and ensures authenticated access
     *
     * @internal This is not a public API method, do not use in own extensions
     * @param bool $proceedIfNoUserIsLoggedIn if set to TRUE, no forced redirect to the login page will be done
     * @return \TYPO3\CMS\Core\Core\Bootstrap
     */
    public function initializeBackendAuthentication($proceedIfNoUserIsLoggedIn = false)
    {
        $GLOBALS['BE_USER']->backendCheckLogin($proceedIfNoUserIsLoggedIn);
        return $this;
    }

    /**
     * Initialize language object
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function initializeLanguageObject()
    {
        /** @var $GLOBALS['LANG'] \TYPO3\CMS\Lang\LanguageService */
        $GLOBALS['LANG'] = GeneralUtility::makeInstance(\TYPO3\CMS\Lang\LanguageService::class);
        $GLOBALS['LANG']->init($GLOBALS['BE_USER']->uc['lang']);
        return $this;
    }

    /**
     * Throw away all output that may have happened during bootstrapping by weird extensions
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function endOutputBufferingAndCleanPreviousOutput()
    {
        ob_clean();
        return $this;
    }

    /**
     * Initialize output compression if configured
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function initializeOutputCompression()
    {
        if (extension_loaded('zlib') && $GLOBALS['TYPO3_CONF_VARS']['BE']['compressionLevel']) {
            if (MathUtility::canBeInterpretedAsInteger($GLOBALS['TYPO3_CONF_VARS']['BE']['compressionLevel'])) {
                @ini_set('zlib.output_compression_level', $GLOBALS['TYPO3_CONF_VARS']['BE']['compressionLevel']);
            }
            ob_start('ob_gzhandler');
        }
        return $this;
    }

    /**
     * Send HTTP headers if configured
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function sendHttpHeaders()
    {
        if (!empty($GLOBALS['TYPO3_CONF_VARS']['BE']['HTTP']['Response']['Headers']) && is_array($GLOBALS['TYPO3_CONF_VARS']['BE']['HTTP']['Response']['Headers'])) {
            foreach ($GLOBALS['TYPO3_CONF_VARS']['BE']['HTTP']['Response']['Headers'] as $header) {
                header($header);
            }
        }
        return $this;
    }

    /**
     * Things that should be performed to shut down the framework.
     * This method is called in all important scripts for a clean
     * shut down of the system.
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function shutdown()
    {
        $this->sendResponse();
        return $this;
    }

    /**
     * Provides an instance of "template" for backend-modules to
     * work with.
     *
     * @return Bootstrap
     * @internal This is not a public API method, do not use in own extensions
     */
    public function initializeBackendTemplate()
    {
        $GLOBALS['TBE_TEMPLATE'] = GeneralUtility::makeInstance(\TYPO3\CMS\Backend\Template\DocumentTemplate::class);
        return $this;
    }
}
