FrontendRequestHandler.php

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<?php
namespace TYPO3\CMS\Extbase\Mvc\Web;

class FrontendRequestHandler extends \TYPO3\CMS\Extbase\Mvc\Web\AbstractRequestHandler {

    protected $configurationManager;

    protected $extensionService;

    public function handleRequest() {
        $request = $this->requestBuilder->build();
        $requestHashService = $this->objectManager->get('TYPO3\\CMS\\Extbase\\Security\\Channel\\RequestHashService');
        $requestHashService->verifyRequest($request);
        if ($this->extensionService->isActionCacheable(NULL, NULL, $request->getControllerName(), $request->getControllerActionName())) {
            $request->setIsCached(TRUE);
        } else {
            $contentObject = $this->configurationManager->getContentObject();
            if ($contentObject->getUserObjectType() === \TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer::OBJECTTYPE_USER) {
                $contentObject->convertToUserIntObject();
                // \TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer::convertToUserIntObject() will recreate the object, so we have to stop the request here
                return NULL;
            }
            $request->setIsCached(FALSE);
        }
        $response = $this->objectManager->get('TYPO3\\CMS\\Extbase\\Mvc\\Web\\Response');
        $this->dispatcher->dispatch($request, $response);
        return $response;
    }

    public function canHandleRequest() {
        return $this->environmentService->isEnvironmentInFrontendMode();
    }
}