Application.php

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<?php

namespace Elgg;

use Elgg\Application\BootHandler;
use Elgg\Application\ErrorHandler;
use Elgg\Application\ExceptionHandler;
use Elgg\Application\ShutdownHandler;
use Elgg\Database\DbConfig;
use Elgg\Di\InternalContainer;
use Elgg\Di\PublicContainer;
use Elgg\Exceptions\ConfigurationException;
use Elgg\Exceptions\Configuration\InstallationException;
use Elgg\Exceptions\HttpException;
use Elgg\Exceptions\Http\GatekeeperException;
use Elgg\Exceptions\Http\PageNotFoundException;
use Elgg\Exceptions\InvalidArgumentException;
use Elgg\Http\ErrorResponse;
use Elgg\Http\OkResponse;
use Elgg\Http\RedirectResponse;
use Elgg\Http\Request as HttpRequest;
use Elgg\Http\ResponseBuilder;
use Elgg\Http\ResponseTransport;
use Elgg\Project\Paths;
use Elgg\Security\UrlSigner;
use Elgg\Traits\Loggable;
use Symfony\Component\Console\Input\ArgvInput;
use Symfony\Component\Console\Input\ArrayInput;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\ConsoleOutput;
use Symfony\Component\Console\Output\NullOutput;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\HttpFoundation\RedirectResponse as SymfonyRedirect;
use Symfony\Component\HttpFoundation\Response;

class Application {

    use Loggable;

    public $internal_services;

    public $public_services;

    public static $_instance;
    
    protected $boot_status = [
        'application_boot_completed' => false,
        'full_boot_completed' => false,
        'plugins_boot_completed' => false,
        'service_boot_completed' => false,
    ];

    public static function getInstance() {
        if (self::$_instance === null) {
            self::$_instance = self::factory();
            self::setGlobalConfig(self::$_instance);
        }

        return self::$_instance;
    }

    public static function setInstance(Application $application = null) {
        self::$_instance = $application;
    }

    public function __construct(InternalContainer $internal_services) {
        $this->internal_services = $internal_services;
        $this->public_services = PublicContainer::factory();
    }

    public static function loadCore() {
        $path = Paths::elgg() . 'engine/lib';

        // include library files, capturing setup functions
        foreach (self::getEngineLibs() as $file) {
            try {
                Includer::requireFileOnce("$path/$file");
            } catch (\Error $e) {
                throw new InstallationException("Elgg lib file failed include: $path/$file");
            }
        }
    }

    public static function start() {
        $app = self::getInstance();
        $app->bootCore();

        return $app;
    }

    public static function isCoreLoaded() {
        return function_exists('elgg');
    }

    public function bootCore() {
        $boot = new BootHandler($this);
        $boot();
    }
    
    public function getBootStatus(string $type): bool {
        return $this->boot_status[$type] ?? false;
    }

    public function setBootStatus(string $type, bool $status): void {
        $this->boot_status[$type] = $status;
    }

    public function getDb() {
        return $this->internal_services->publicDb;
    }

    public static function setGlobalConfig(Application $application) {
        global $CONFIG;
        $CONFIG = $application->internal_services->config;
    }

    public static function factory(array $spec = []) {

        $defaults = [
            'config' => null,
            'handle_exceptions' => true,
            'handle_shutdown' => true,
            'request' => null,
            'internal_services' => null,
            'set_start_time' => true,
            'settings_path' => '',
        ];
        $spec = array_merge($defaults, $spec);

        if ($spec['set_start_time']) {
            // The time with microseconds when the Elgg engine was started.
            if (!isset($GLOBALS['START_MICROTIME'])) {
                $GLOBALS['START_MICROTIME'] = microtime(true);
            }
        }

        if ($spec['handle_exceptions']) {
            set_error_handler(new ErrorHandler());
            set_exception_handler(new ExceptionHandler());
        }

        self::loadCore();

        if (!$spec['internal_services']) {
            if (!$spec['config']) {
                $spec['config'] = Config::factory($spec['settings_path']);
            }
            
            $spec['internal_services'] = InternalContainer::factory(['config' => $spec['config']]);
        }

        if ($spec['request']) {
            if (!$spec['request'] instanceof HttpRequest) {
                throw new InvalidArgumentException('Given request is not a ' . HttpRequest::class);
            }

            $spec['request']->initializeTrustedProxyConfiguration($spec['internal_services']->config);
            $spec['request']->correctBaseURL($spec['internal_services']->config);
            $spec['internal_services']->set('request', $spec['request']);
        }

        $app = new self($spec['internal_services']);

        if ($spec['handle_shutdown']) {
            register_shutdown_function(new ShutdownHandler($app));
        }

        return $app;
    }

    public static function route(HttpRequest $request) {
        self::loadCore();

        if ($request->isRewriteCheck()) {
            $response = new OkResponse(HttpRequest::REWRITE_TEST_OUTPUT);
            return self::respond($response);
        }

        if (self::$_instance) {
            $app = self::$_instance;
            $app->internal_services->set('request', $request);
        } else {
            try {
                $app = self::factory([
                    'request' => $request,
                ]);

                self::setGlobalConfig($app);
                self::setInstance($app);
            } catch (ConfigurationException $ex) {
                return self::install();
            }
        }

        return $app->run();
    }

    public static function respond(ResponseBuilder $builder): ?Response {
        if (self::$_instance) {
            self::$_instance->internal_services->responseFactory->respond($builder);

            return self::$_instance->internal_services->responseFactory->getSentResponse();
        }

        try {
            $content = $builder->getContent();
            $status = $builder->getStatusCode();
            $headers = $builder->getHeaders();

            if ($builder->isRedirection()) {
                $forward_url = $builder->getForwardURL();
                $response = new SymfonyRedirect($forward_url, $status, $headers);
            } else {
                $response = new Response($content, $status, $headers);
            }
        } catch (\Exception $ex) {
            $response = new Response($ex->getMessage(), 500);
        }

        $response->headers->set('Pragma', 'public');
        $response->headers->set('Cache-Control', 'no-store, must-revalidate');
        $response->headers->set('Expires', 'Fri, 05 Feb 1982 00:00:00 -0500');

        self::getResponseTransport()->send($response);

        return $response;
    }

    public static function index() {
        return self::route(self::getRequest());
    }

    public function run() {
        $config = $this->internal_services->config;
        $request = $this->internal_services->request;

        try {
            if ($request->isCliServer()) {
                if ($request->isCliServable(Paths::project())) {
                    return false;
                }

                // overwrite value from settings
                $www_root = rtrim($request->getSchemeAndHttpHost() . $request->getBaseUrl(), '/') . '/';
                $config->wwwroot = $www_root;
                $config->wwwroot_cli_server = $www_root;
            }

            if (str_starts_with($request->getElggPath(), '/cache/')) {
                $config->_disable_session_save = true;
                $response = $this->internal_services->cacheHandler->handleRequest($request, $this)->prepare($request);
                self::getResponseTransport()->send($response);

                return $response;
            }
            
            if ($request->getElggPath() === '/refresh_token') {
                $config->_disable_session_save = true;
                $token = new \Elgg\Controllers\RefreshCsrfToken();
                $response = $token($request);
                self::getResponseTransport()->send($response);

                return $response;
            }

            if (str_starts_with($request->getElggPath(), '/serve-file/')) {
                $config->_disable_session_save = true;
                $response = $this->internal_services->serveFileHandler->getResponse($request);
                self::getResponseTransport()->send($response);

                return $response;
            }
            
            if ($this->isCli()) {
                $config->_disable_session_save = true;
            }

            $this->bootCore();

            // re-fetch new request from services in case it was replaced by route:rewrite
            $request = $this->internal_services->request;

            if (!$this->internal_services->router->route($request)) {
                throw new PageNotFoundException();
            }
        } catch (HttpException $ex) {
            $forward_url = $ex->getRedirectUrl();
            if (!$forward_url) {
                if ($ex instanceof GatekeeperException) {
                    $forward_url = elgg_is_logged_in() ? null : elgg_get_login_url();
                } else if ($request->getFirstUrlSegment() == 'action') {
                    $forward_url = REFERRER;
                }
            }

            $forward_url = (string) $this->internal_services->events->triggerResults('forward', $ex->getCode(), ['exception' => $ex], $forward_url);

            if ($forward_url && !$request->isXmlHttpRequest()) {
                if ($ex->getMessage()) {
                    $this->internal_services->system_messages->addErrorMessage($ex->getMessage());
                }
                
                $response = new RedirectResponse($forward_url);
            } else {
                $response = new ErrorResponse($ex->getMessage(), $ex->getCode(), $forward_url);
            }
            
            $response->setException($ex);

            self::respond($response);
        }

        return $this->internal_services->responseFactory->getSentResponse();
    }

    public static function install() {
        ini_set('display_errors', 1);

        try {
            $installer = new \ElggInstaller();
            $response = $installer->run();
        } catch (\Exception $ex) {
            $response = new ErrorResponse($ex->getMessage(), 500);
        }

        return self::respond($response);
    }

    public static function upgrade() {

        try {
            self::migrate();
            self::start();

            $request = self::$_instance->internal_services->request;
            $signer = self::$_instance->internal_services->urlSigner;

            $url = $request->getCurrentURL();
            $query = $request->getParams();

            // We need to resign the URL because the path is different
            $mac = elgg_extract(UrlSigner::KEY_MAC, $query);
            if (isset($mac) && !$signer->isValid($url)) {
                throw new HttpException(elgg_echo('invalid_request_signature'), ELGG_HTTP_FORBIDDEN);
            }

            unset($query[UrlSigner::KEY_MAC]);

            $base_url = elgg_normalize_site_url('upgrade/init');
            $url = elgg_http_add_url_query_elements($base_url, $query);

            if (isset($mac)) {
                $url = self::$_instance->internal_services->urlSigner->sign($url);
            }

            $response = new RedirectResponse($url, ELGG_HTTP_PERMANENTLY_REDIRECT);
        } catch (\Exception $ex) {
            $response = new ErrorResponse($ex->getMessage(), $ex->getCode() ?: ELGG_HTTP_INTERNAL_SERVER_ERROR);
        }

        return self::respond($response);
    }

    public static function migrate() {
        
        $constants = Paths::elgg() . 'engine/lib/constants.php';
        Includer::requireFileOnce($constants);
        
        $conf = Paths::elgg() . 'engine/schema/migrations.php';
        if (!$conf) {
            throw new InstallationException('Settings file is required to run database migrations.');
        }

        // setting timeout because some database migrations can take a long time
        set_time_limit(0);

        $app = new \Phinx\Console\PhinxApplication();
        $wrapper = new \Phinx\Wrapper\TextWrapper($app, [
            'configuration' => $conf,
        ]);
        $log = $wrapper->getMigrate();

        if (!empty($_SERVER['argv']) && in_array('--verbose', $_SERVER['argv'])) {
            error_log($log);
        }

        return true;
    }

    public static function getMigrationSettings() {

        $config = Config::factory();
        $db_config = DbConfig::fromElggConfig($config);

        if ($db_config->isDatabaseSplit()) {
            $conn = $db_config->getConnectionConfig(DbConfig::WRITE);
        } else {
            $conn = $db_config->getConnectionConfig();
        }

        return [
            'paths' => [
                'migrations' => Paths::elgg() . 'engine/schema/migrations/',
            ],
            'environments' => [
                'default_migration_table' => "{$conn['prefix']}migrations",
                'default_environment' => 'prod',
                'prod' => [
                    'adapter' => 'mysql',
                    'host' => $conn['host'],
                    'port' => $conn['port'],
                    'name' => $conn['database'],
                    'user' => $conn['user'],
                    'pass' => $conn['password'],
                    'charset' => $conn['encoding'],
                    'table_prefix' => $conn['prefix'],
                ],
            ],
        ];
    }

    public function allowPathRewrite() {
        $request = $this->internal_services->request;
        $new = $this->internal_services->router->allowRewrite($request);
        if ($new === $request) {
            return;
        }

        $this->internal_services->set('request', $new);
    }

    public static function isCli() {
        switch (PHP_SAPI) {
            case 'cli':
            case 'phpdbg':
                return true;

            default:
                return false;
        }
    }

    public static function getRequest() {
        if (self::$_instance) {
            return self::$_instance->internal_services->request;
        }

        return HttpRequest::createFromGlobals();
    }

    public static function getStdIn() {
        if (self::isCli()) {
            $request = self::getRequest();
            $argv = $request->server->get('argv') ?: [];
            return new ArgvInput($argv);
        }

        return new ArrayInput([]);
    }

    public static function getStdOut() {
        if (self::isCli()) {
            return new ConsoleOutput();
        } else {
            return new NullOutput();
        }
    }

    public static function getStdErr() {
        $std_out = self::getStdOut();
        if (is_callable([$std_out, 'getErrorOutput'])) {
            return $std_out->getErrorOutput();
        }

        return $std_out;
    }

    public static function getResponseTransport() {
        if (self::isCli()) {
            return new \Elgg\Http\OutputBufferTransport();
        }

        return new \Elgg\Http\HttpProtocolTransport();
    }

    private static function getEngineLibs() {
        return [
            'elgglib.php',
            'events.php',
            'access.php',
            'actions.php',
            'admin.php',
            'annotations.php',
            'breadcrumbs.php',
            'cache.php',
            'configuration.php',
            'constants.php',
            'context.php',
            'entities.php',
            'external_files.php',
            'filestore.php',
            'gatekeepers.php',
            'input.php',
            'languages.php',
            'mb_wrapper.php',
            'metadata.php',
            'navigation.php',
            'notification.php',
            'output.php',
            'pagehandler.php',
            'pageowner.php',
            'pam.php',
            'plugins.php',
            'relationships.php',
            'river.php',
            'sessions.php',
            'users.php',
            'views.php',
            'widgets.php',
        ];
    }
}