290 lines
9.8 KiB
PHP
290 lines
9.8 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\HttpKernel;
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use Symfony\Component\HttpFoundation\Exception\RequestExceptionInterface;
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use Symfony\Component\HttpFoundation\Request;
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use Symfony\Component\HttpFoundation\RequestStack;
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use Symfony\Component\HttpFoundation\Response;
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use Symfony\Component\HttpKernel\Controller\ArgumentResolver;
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use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;
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use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface;
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use Symfony\Component\HttpKernel\Event\ControllerArgumentsEvent;
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use Symfony\Component\HttpKernel\Event\ControllerEvent;
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use Symfony\Component\HttpKernel\Event\ExceptionEvent;
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use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
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use Symfony\Component\HttpKernel\Event\RequestEvent;
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use Symfony\Component\HttpKernel\Event\ResponseEvent;
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use Symfony\Component\HttpKernel\Event\TerminateEvent;
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use Symfony\Component\HttpKernel\Event\ViewEvent;
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use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
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use Symfony\Component\HttpKernel\Exception\ControllerDoesNotReturnResponseException;
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use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
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use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
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use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
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// Help opcache.preload discover always-needed symbols
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class_exists(ControllerArgumentsEvent::class);
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class_exists(ControllerEvent::class);
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class_exists(ExceptionEvent::class);
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class_exists(FinishRequestEvent::class);
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class_exists(RequestEvent::class);
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class_exists(ResponseEvent::class);
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class_exists(TerminateEvent::class);
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class_exists(ViewEvent::class);
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class_exists(KernelEvents::class);
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/**
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* HttpKernel notifies events to convert a Request object to a Response one.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class HttpKernel implements HttpKernelInterface, TerminableInterface
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{
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protected $dispatcher;
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protected $resolver;
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protected $requestStack;
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private $argumentResolver;
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public function __construct(EventDispatcherInterface $dispatcher, ControllerResolverInterface $resolver, RequestStack $requestStack = null, ArgumentResolverInterface $argumentResolver = null)
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{
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$this->dispatcher = $dispatcher;
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$this->resolver = $resolver;
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$this->requestStack = $requestStack ?? new RequestStack();
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$this->argumentResolver = $argumentResolver ?? new ArgumentResolver();
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}
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/**
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* {@inheritdoc}
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*/
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public function handle(Request $request, int $type = HttpKernelInterface::MAIN_REQUEST, bool $catch = true)
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{
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$request->headers->set('X-Php-Ob-Level', (string) ob_get_level());
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try {
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return $this->handleRaw($request, $type);
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} catch (\Exception $e) {
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if ($e instanceof RequestExceptionInterface) {
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$e = new BadRequestHttpException($e->getMessage(), $e);
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}
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if (false === $catch) {
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$this->finishRequest($request, $type);
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throw $e;
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}
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return $this->handleThrowable($e, $request, $type);
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function terminate(Request $request, Response $response)
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{
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$this->dispatcher->dispatch(new TerminateEvent($this, $request, $response), KernelEvents::TERMINATE);
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}
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/**
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* @internal
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*/
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public function terminateWithException(\Throwable $exception, Request $request = null)
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{
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if (!$request = $request ?: $this->requestStack->getMainRequest()) {
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throw $exception;
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}
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$response = $this->handleThrowable($exception, $request, self::MAIN_REQUEST);
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$response->sendHeaders();
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$response->sendContent();
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$this->terminate($request, $response);
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}
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/**
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* Handles a request to convert it to a response.
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*
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* Exceptions are not caught.
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*
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* @throws \LogicException If one of the listener does not behave as expected
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* @throws NotFoundHttpException When controller cannot be found
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*/
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private function handleRaw(Request $request, int $type = self::MAIN_REQUEST): Response
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{
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$this->requestStack->push($request);
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// request
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$event = new RequestEvent($this, $request, $type);
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$this->dispatcher->dispatch($event, KernelEvents::REQUEST);
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if ($event->hasResponse()) {
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return $this->filterResponse($event->getResponse(), $request, $type);
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}
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// load controller
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if (false === $controller = $this->resolver->getController($request)) {
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throw new NotFoundHttpException(sprintf('Unable to find the controller for path "%s". The route is wrongly configured.', $request->getPathInfo()));
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}
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$event = new ControllerEvent($this, $controller, $request, $type);
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$this->dispatcher->dispatch($event, KernelEvents::CONTROLLER);
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$controller = $event->getController();
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// controller arguments
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$arguments = $this->argumentResolver->getArguments($request, $controller);
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$event = new ControllerArgumentsEvent($this, $controller, $arguments, $request, $type);
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$this->dispatcher->dispatch($event, KernelEvents::CONTROLLER_ARGUMENTS);
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$controller = $event->getController();
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$arguments = $event->getArguments();
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// call controller
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$response = $controller(...$arguments);
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// view
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if (!$response instanceof Response) {
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$event = new ViewEvent($this, $request, $type, $response);
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$this->dispatcher->dispatch($event, KernelEvents::VIEW);
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if ($event->hasResponse()) {
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$response = $event->getResponse();
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} else {
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$msg = sprintf('The controller must return a "Symfony\Component\HttpFoundation\Response" object but it returned %s.', $this->varToString($response));
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// the user may have forgotten to return something
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if (null === $response) {
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$msg .= ' Did you forget to add a return statement somewhere in your controller?';
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}
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throw new ControllerDoesNotReturnResponseException($msg, $controller, __FILE__, __LINE__ - 17);
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}
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}
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return $this->filterResponse($response, $request, $type);
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}
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/**
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* Filters a response object.
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*
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* @throws \RuntimeException if the passed object is not a Response instance
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*/
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private function filterResponse(Response $response, Request $request, int $type): Response
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{
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$event = new ResponseEvent($this, $request, $type, $response);
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$this->dispatcher->dispatch($event, KernelEvents::RESPONSE);
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$this->finishRequest($request, $type);
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return $event->getResponse();
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}
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/**
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* Publishes the finish request event, then pop the request from the stack.
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*
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* Note that the order of the operations is important here, otherwise
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* operations such as {@link RequestStack::getParentRequest()} can lead to
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* weird results.
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*/
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private function finishRequest(Request $request, int $type)
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{
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$this->dispatcher->dispatch(new FinishRequestEvent($this, $request, $type), KernelEvents::FINISH_REQUEST);
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$this->requestStack->pop();
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}
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/**
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* Handles a throwable by trying to convert it to a Response.
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*
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* @throws \Exception
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*/
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private function handleThrowable(\Throwable $e, Request $request, int $type): Response
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{
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$event = new ExceptionEvent($this, $request, $type, $e);
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$this->dispatcher->dispatch($event, KernelEvents::EXCEPTION);
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// a listener might have replaced the exception
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$e = $event->getThrowable();
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if (!$event->hasResponse()) {
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$this->finishRequest($request, $type);
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throw $e;
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}
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$response = $event->getResponse();
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// the developer asked for a specific status code
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if (!$event->isAllowingCustomResponseCode() && !$response->isClientError() && !$response->isServerError() && !$response->isRedirect()) {
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// ensure that we actually have an error response
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if ($e instanceof HttpExceptionInterface) {
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// keep the HTTP status code and headers
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$response->setStatusCode($e->getStatusCode());
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$response->headers->add($e->getHeaders());
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} else {
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$response->setStatusCode(500);
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}
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}
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try {
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return $this->filterResponse($response, $request, $type);
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} catch (\Exception $e) {
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return $response;
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}
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}
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/**
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* Returns a human-readable string for the specified variable.
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*/
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private function varToString($var): string
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{
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if (\is_object($var)) {
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return sprintf('an object of type %s', \get_class($var));
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}
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if (\is_array($var)) {
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$a = [];
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foreach ($var as $k => $v) {
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$a[] = sprintf('%s => ...', $k);
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}
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return sprintf('an array ([%s])', mb_substr(implode(', ', $a), 0, 255));
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}
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if (\is_resource($var)) {
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return sprintf('a resource (%s)', get_resource_type($var));
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}
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if (null === $var) {
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return 'null';
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}
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if (false === $var) {
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return 'a boolean value (false)';
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}
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if (true === $var) {
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return 'a boolean value (true)';
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}
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if (\is_string($var)) {
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return sprintf('a string ("%s%s")', mb_substr($var, 0, 255), mb_strlen($var) > 255 ? '...' : '');
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}
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if (is_numeric($var)) {
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return sprintf('a number (%s)', (string) $var);
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}
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return (string) $var;
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}
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}
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