JsonView.php

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<?php
namespace TYPO3\CMS\Install\View;

use TYPO3\CMS\Extbase\Mvc\View\AbstractView;
use TYPO3\CMS\Install\Status\StatusInterface;
use TYPO3\CMS\Install\Status\Exception as StatusException;

class JsonView extends AbstractView {

    public function render() {
        $renderedData = $this->variables;
        if (isset($renderedData['status']) && is_array($renderedData['status'])) {
            try {
                $renderedData['status'] = $this->transformStatusMessagesToArray($renderedData['status']);
            } catch (StatusException $e) {
                $renderedData['status'] = array(array(
                    'severity' => 'error',
                    'title' => htmlspecialchars($e->getMessage())
                ));
            }
        }

        return $renderedData;
    }

    protected function transformStatusMessagesToArray(array $statusArray = array()) {
        $result = array();
        foreach ($statusArray as $status) {
            if (!$status instanceof StatusInterface) {
                throw new StatusException (
                    'Object must implement StatusInterface',
                    1381059600
                );
            }
            $result[] = $this->transformStatusToArray($status);
        }
        return $result;
    }

    public function transformStatusToArray(StatusInterface $status) {
        $arrayStatus = array();
        $arrayStatus['severity'] = htmlspecialchars($status->getSeverity());
        $arrayStatus['title'] = htmlspecialchars($status->getTitle());
        $arrayStatus['message'] = htmlspecialchars($status->getMessage());
        return $arrayStatus;
    }

}