protected function getPreAuthenticatedData(Request $request)
    {
        $kernelClosure = $this->legacyKernelClosure;
        /** @var \ezpKernelHandler $legacyKernel */
        $legacyKernel = $kernelClosure();
        $logger = $this->logger;

        $legacyUser = $legacyKernel->runCallback(
            static function () use ($logger) {
                foreach (eZINI::instance()->variable('UserSettings', 'SingleSignOnHandlerArray') as $ssoHandlerName) {
                    $className = 'eZ' . $ssoHandlerName . 'SSOHandler';
                    if (!class_exists($className)) {
                        if ($logger) {
                            $logger->error("Undefined legacy SSOHandler class: $className");
                        }
                        continue;
                    }

                    $ssoHandler = new $className();
                    $ssoUser = $ssoHandler->handleSSOLogin();
                    if (!$ssoUser instanceof eZUser) {
                        continue;
                    }

                    $logger->info("Matched user using eZ legacy SSO Handler: $className");

                    return $ssoUser;
                }
            },
            false,
            false
        );

        // No matched user with legacy.
        if (!$legacyUser instanceof eZUser) {
            return ['', ''];
        }

        $user = new User(
            $this->userService->loadUser($legacyUser->attribute('contentobject_id')),
            ['ROLE_USER']
        );

        return [$user, $user->getPassword()];
    }