src/AppBundle/Controller/TaskController.php

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<?php

namespace AppBundle\Controller;

use Biz\Activity\Service\ActivityService;
use Biz\Classroom\Service\ClassroomService;
use Biz\Course\CourseException;
use Biz\Course\Service\CourseService;
use Biz\Course\Service\CourseSetService;
use Biz\Course\Service\LearningDataAnalysisService;
use Biz\Course\Service\MemberService;
use Biz\Task\Service\TaskResultService;
use Biz\Task\Service\TaskService;
use Biz\Task\TaskException;
use Biz\User\Service\TokenService;
use Biz\User\UserException;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Security\Core\Exception\AccessDeniedException;
use AppBundle\Common\ArrayToolkit;

class TaskController extends BaseController
{
    public function showAction(Request $request, $courseId, $id)
    {
        //blank返回空页面的原因是因为firefox中iframe必须加载有效的src属性才能不出现闪烁的问题.
        $blank = $request->query->get('blank');
        if ($blank) {
            return new Response();
        }

        $preview = $request->query->get('preview');

        $user = $this->getUser();
        if (!$user->isLogin()) {
            return $this->createMessageResponse('info', '请先登录', '', 3, $this->generateUrl('login'));
        }

        try {
            $task = $this->tryLearnTask($courseId, $id, (bool) $preview);
            $activity = $this->getActivityService()->getActivity($task['activityId'], true);

            if (!empty($activity['ext']) && !empty($activity['ext']['mediaId'])) {
                $media = $this->getUploadFileService()->getFile($activity['ext']['mediaId']);
            }

            $media = !empty($media) ? $media : array();
        } catch (AccessDeniedException $accessDeniedException) {
            return $this->handleAccessDeniedException($accessDeniedException, $request, $id);
        } catch (CourseException $deniedException) {
            return $this->handleAccessDeniedException($deniedException, $request, $id);
        }

        $user = $this->getCurrentUser();
        $course = $this->getCourseService()->getCourse($courseId);

        $member = $this->getCourseMemberService()->getCourseMember($courseId, $user['id']);

        if ($member['locked']) {
            return $this->redirectToRoute('my_course_show', array('id' => $courseId));
        }