BootHandler.php

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<?php

namespace Elgg\Application;

use Elgg\Application;

class BootHandler {

    protected $app;

    public function __construct(Application $app) {
        $this->app = $app;
    }

    public function __invoke(): void {
        if ($this->app->getBootStatus('full_boot_completed')) {
            return;
        }

        $this->bootServices();
        $this->bootPlugins();
        $this->bootApplication();
    }

    public function bootServices(): void {
        if ($this->app->getBootStatus('service_boot_completed')) {
            return;
        }

        // in case not loaded already
        $this->app->loadCore();

        if (!$this->app->internal_services->db) {
            // no database boot!
            elgg_views_boot();
            $this->app->internal_services->session->start();
            $this->app->internal_services->translator->bootTranslations();

            \Elgg\Application\SystemEventHandlers::init();

            $this->app->setBootStatus('full_boot_completed', true);

            return;
        }

        $this->setEntityClasses();
        
        // need to be registered as part of services, because partial boots do at least include the services
        // the system relies on the existence of some of the event
        $this->registerEvents();

        // Connect to database, load language files, load configuration, init session
        $this->app->internal_services->boot->boot($this->app->internal_services);
        
        // we don't store langs in boot data because it varies by user
        $this->app->internal_services->translator->bootTranslations();
        
        $this->app->setBootStatus('service_boot_completed', true);
    }

    public function bootPlugins(): void {
        if ($this->app->getBootStatus('plugins_boot_completed') || !$this->app->internal_services->db) {
            return;
        }

        $events = $this->app->internal_services->events;

        $events->registerHandler('plugins_load:before', 'system', 'elgg_views_boot');
        $events->registerHandler('plugins_load:after', 'system', function() {
            $this->app->internal_services->session->boot();
        });

        $events->registerHandler('plugins_boot', 'system', function() {
            $this->registerRoutes();
        });
        $events->registerHandler('plugins_boot', 'system', function() {
            $this->registerActions();
        });

        // Setup all boot sequence handlers for active plugins
        $this->app->internal_services->plugins->build();

        // Register plugin classes, entities etc
        // Call PluginBootstrap::load()
        // After event completes, Elgg session is booted
        $events->triggerSequence('plugins_load', 'system');

        // Boot plugin, setup languages and views
        // Call PluginBootstrap::boot()
        $events->triggerSequence('plugins_boot', 'system');

        $this->app->setBootStatus('plugins_boot_completed', true);
    }

    public function bootApplication(): void {
        if ($this->app->getBootStatus('application_boot_completed') || !$this->app->internal_services->db) {
            return;
        }

        $events = $this->app->internal_services->events;

        $this->app->internal_services->views->clampViewtypeToPopulatedViews();
        $this->app->allowPathRewrite();

        // Complete the boot process for both engine and plugins
        $events->triggerSequence('init', 'system');

        $this->app->setBootStatus('full_boot_completed', true);

        // Tell the access functions the system has booted, plugins are loaded,
        // and the user is logged in so it can start caching
        $this->app->internal_services->accessCollections->markInitComplete();
        
        // System loaded and ready
        $events->triggerSequence('ready', 'system');

        $this->app->setBootStatus('application_boot_completed', true);
    }

    public function setEntityClasses(): void {
        elgg_set_entity_class('user', 'user', \ElggUser::class);
        elgg_set_entity_class('group', 'group', \ElggGroup::class);
        elgg_set_entity_class('site', 'site', \ElggSite::class);
        elgg_set_entity_class('object', 'plugin', \ElggPlugin::class);
        elgg_set_entity_class('object', 'file', \ElggFile::class);
        elgg_set_entity_class('object', 'widget', \ElggWidget::class);
        elgg_set_entity_class('object', 'comment', \ElggComment::class);
        elgg_set_entity_class('object', 'elgg_upgrade', \ElggUpgrade::class);
        elgg_set_entity_class('object', 'admin_notice', \ElggAdminNotice::class);
    }
    
    protected function registerEvents(): void {
        $conf = \Elgg\Project\Paths::elgg() . 'engine/events.php';
        $spec = \Elgg\Includer::includeFile($conf);
        
        $events = $this->app->internal_services->events;
        
        foreach ($spec as $name => $types) {
            foreach ($types as $type => $callbacks) {
                foreach ($callbacks as $callback => $event_spec) {
                    if (!is_array($event_spec)) {
                        continue;
                    }
                    
                    $unregister = (bool) elgg_extract('unregister', $event_spec, false);
                    
                    if ($unregister) {
                        $events->unregisterHandler($name, $type, $callback);
                    } else {
                        $priority = (int) elgg_extract('priority', $event_spec, 500);
                        
                        $events->registerHandler($name, $type, $callback, $priority);
                    }
                }
            }
        }
    }
    
    protected function registerRoutes(): void {
        $conf = \Elgg\Project\Paths::elgg() . 'engine/routes.php';
        $routes = \Elgg\Includer::includeFile($conf);
    
        foreach ($routes as $name => $def) {
            $this->app->internal_services->routes->register($name, $def);
        }
    }
    
    protected function registerActions(): void {
        $conf = \Elgg\Project\Paths::elgg() . 'engine/actions.php';
        $actions = \Elgg\Includer::includeFile($conf);
        
        $root_path = \Elgg\Project\Paths::elgg();
    
        foreach ($actions as $action => $action_spec) {
            if (!is_array($action_spec)) {
                continue;
            }
            
            $access = elgg_extract('access', $action_spec, 'logged_in');
            $handler = elgg_extract('controller', $action_spec);
            if (!$handler) {
                $handler = elgg_extract('filename', $action_spec) ?: "{$root_path}/actions/{$action}.php";
            }
            
            $this->app->internal_services->actions->register($action, $handler, $access);
        }
    }
}