SessionManagerService.php

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<?php

namespace Elgg;

use Elgg\Cache\AccessCache;
use Elgg\Cache\EntityCache;
use Elgg\Exceptions\LoginException;
use Elgg\Exceptions\SecurityException;
use Elgg\I18n\Translator;

class SessionManagerService {
    
    protected bool $ignore_access = false;
    
    protected ?\ElggUser $logged_in_user = null;
    
    protected bool $show_disabled_entities = false;

    protected bool $show_deleted_entities = false;
    
    public function __construct(
        protected \ElggSession $session,
        protected EventsService $events,
        protected Translator $translator,
        protected PersistentLoginService $persistent_login,
        protected AccessCache $access_cache,
        protected EntityCache $entity_cache
    ) {
    }
    
    public function getIgnoreAccess(): bool {
        return $this->ignore_access;
    }
    
    public function setIgnoreAccess(bool $ignore = true): bool {
        $prev = $this->ignore_access;
        $this->ignore_access = $ignore;
        
        return $prev;
    }
    
    public function getDisabledEntityVisibility(): bool {
        return $this->show_disabled_entities;
    }
    
    public function setDisabledEntityVisibility(bool $show = true): bool {
        $prev = $this->show_disabled_entities;
        $this->show_disabled_entities = $show;
        
        return $prev;
    }

    public function getDeletedEntityVisibility(): bool {
        return $this->show_deleted_entities;
    }
    
    public function setDeletedEntityVisibility(bool $show = true): bool {
        $prev = $this->show_deleted_entities;
        $this->show_deleted_entities = $show;

        return $prev;
    }
    
    public function setUserToken(?\ElggUser $user = null): void {
        if (!$user instanceof \ElggUser) {
            $user = $this->getLoggedInUser();
        }
        
        if (!$user instanceof \ElggUser) {
            return;
        }
        
        $this->session->set('__user_token', $this->generateUserToken($user));
    }
    
    public function validateUserToken(\ElggUser $user): void {
        $session_token = $this->session->get('__user_token');
        $user_token = $this->generateUserToken($user);
        
        if ($session_token !== $user_token) {
            throw new SecurityException($this->translator->translate('session_expired'));
        }
    }
    
    protected function generateUserToken(\ElggUser $user): string {
        $hmac = _elgg_services()->hmac->getHmac([
            $user->time_created,
            $user->guid,
        ], 'sha256', $user->password_hash);

        return $hmac->getToken();
    }
    
    public function login(\ElggUser $user, bool $persistent = false): void {
        if ($user->isBanned()) {
            throw new LoginException($this->translator->translate('LoginException:BannedUser'));
        }
        
        // check before updating last login to determine first login
        $first_login = empty($user->last_login);
        
        $this->events->triggerSequence('login', 'user', $user, function(\ElggUser $user) use ($persistent) {
            if (!$user->isEnabled()) {
                return false;
            }
            
            $this->setLoggedInUser($user, true);
            $this->setUserToken($user);
            
            // re-register at least the core language file for users with language other than site default
            $this->translator->registerTranslations(\Elgg\Project\Paths::elgg() . 'languages/');
            
            // if remember me checked, set cookie with token and store hash(token) for user
            if ($persistent) {
                $this->persistent_login->makeLoginPersistent($user);
            }
            
            // User's privilege has been elevated, so change the session id (prevents session fixation)
            $this->session->migrate();
            
            $user->setLastLogin();
            
            _elgg_services()->accounts->resetAuthenticationFailures($user); // can't inject DI service because of circular reference
            
            return true;
        });
        
        if (!$user->isEnabled()) {
            $this->removeLoggedInUser();
            
            throw new LoginException($this->translator->translate('LoginException:DisabledUser'));
        }
        
        if (!elgg_is_logged_in()) {
            // login might be prevented without throwing a custom exception
            throw new LoginException($this->translator->translate('LoginException:Unknown'));
        }
        
        if ($first_login) {
            $this->events->trigger('login:first', 'user', $user);
            $user->first_login = time();
        }
    }
    
    public function logout(): bool {
        $user = $this->getLoggedInUser();
        if (!$user instanceof \ElggUser) {
            return false;
        }

        if (!$this->events->triggerBefore('logout', 'user', $user)) {
            return false;
        }
        
        $this->persistent_login->removePersistentLogin();
        
        // pass along any messages into new session
        $old_msg = $this->session->get(SystemMessagesService::SESSION_KEY, []);
        $this->session->invalidate();
        
        $this->logged_in_user = null;
        
        $this->session->set(SystemMessagesService::SESSION_KEY, $old_msg);
        
        $this->events->triggerAfter('logout', 'user', $user);
        
        return true;
    }
    
    public function setLoggedInUser(\ElggUser $user, ?bool $migrate = null): void {
        $current_user = $this->getLoggedInUser();
        if ($current_user != $user) {
            if (!isset($migrate)) {
                $migrate = !\Elgg\Application::isCli();
            }
            
            if ($migrate) {
                $this->session->migrate(true);
            }
            
            $this->session->set('guid', $user->guid);
            $this->logged_in_user = $user;
            $this->access_cache->clear();
            $this->entity_cache->save($user->guid, $user);
            $this->translator->setCurrentLanguage($user->language);
        }
    }
    
    public function getLoggedInUser(): ?\ElggUser {
        return $this->logged_in_user;
    }
    
    public function getLoggedInUserGuid(): int {
        $user = $this->getLoggedInUser();
        return $user ? $user->guid : 0;
    }
    
    public function isAdminLoggedIn(): bool {
        $user = $this->getLoggedInUser();
        
        return $user && $user->isAdmin();
    }
    
    public function isLoggedIn(): bool {
        return (bool) $this->getLoggedInUser();
    }
    
    public function removeLoggedInUser(): void {
        $this->logged_in_user = null;
        $this->session->remove('guid');
        $this->access_cache->clear();
    }
}