Invoker.php

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<?php

namespace Elgg;

use Closure;
use Elgg\Di\PublicContainer;
use ElggSession;

class Invoker {

    protected $session;

    protected $dic;

    public function __construct(ElggSession $session, PublicContainer $dic) {
        $this->session = $session;
        $this->dic = $dic;
    }

    public function call(int $flags, Closure $closure) {

        $ia = $this->session->getIgnoreAccess();
        if ($flags & ELGG_IGNORE_ACCESS) {
            $this->session->setIgnoreAccess(true);
        } else if ($flags & ELGG_ENFORCE_ACCESS) {
            $this->session->setIgnoreAccess(false);
        }

        $ha = $this->session->getDisabledEntityVisibility();
        if ($flags & ELGG_SHOW_DISABLED_ENTITIES) {
            $this->session->setDisabledEntityVisibility(true);
        } else if ($flags & ELGG_HIDE_DISABLED_ENTITIES) {
            $this->session->setDisabledEntityVisibility(false);
        }
        
        $system_log_enabled = null;
        $system_log_service = null;
        if ((($flags & ELGG_ENABLE_SYSTEM_LOG) || ($flags & ELGG_DISABLE_SYSTEM_LOG)) && elgg_is_active_plugin('system_log')) {
            try {
                $system_log_service = \Elgg\SystemLog\SystemLog::instance();
                $system_log_enabled = $system_log_service->isLoggingEnabled();
                
                if ($flags & ELGG_ENABLE_SYSTEM_LOG) {
                    $system_log_service->enableLogging();
                } elseif ($flags & ELGG_DISABLE_SYSTEM_LOG) {
                    $system_log_service->disableLogging();
                }
            } catch (\DI\NotFoundException $e) {
                // somehow the service isn't correctly registered
            }
        }

        $restore = function () use ($ia, $ha, $system_log_service, $system_log_enabled) {
            $this->session->setIgnoreAccess($ia);
            $this->session->setDisabledEntityVisibility($ha);
            
            if (isset($system_log_service)) {
                if ($system_log_enabled) {
                    $system_log_service->enableLogging();
                } else {
                    $system_log_service->disableLogging();
                }
            }
        };

        try {
            $result = $this->dic->call($closure);
        } catch (\Throwable $e) {
            $restore();
            throw $e;
        }
        $restore();

        return $result;
    }
}