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<?php |
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namespace Debril\RssAtomBundle\Controller; |
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use Debril\RssAtomBundle\Protocol\FeedFormatter; |
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use Debril\RssAtomBundle\Protocol\FeedOutInterface; |
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use Symfony\Component\HttpFoundation\Response; |
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use Symfony\Component\HttpFoundation\Request; |
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use Symfony\Bundle\FrameworkBundle\Controller\Controller; |
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use Debril\RssAtomBundle\Provider\FeedContentProviderInterface; |
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use Debril\RssAtomBundle\Exception\FeedException\FeedNotFoundException; |
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/** |
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* Class StreamController. |
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*/ |
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class StreamController extends Controller |
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{ |
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/** |
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* default provider. |
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*/ |
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const DEFAULT_SOURCE = 'debril.provider.default'; |
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/** |
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* parameter used to force refresh at every hit (skips 'If-Modified-Since' usage). |
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* set it to true for debug purpose. |
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*/ |
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const FORCE_PARAM_NAME = 'force_refresh'; |
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/** |
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* @var \DateTime |
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*/ |
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protected $since; |
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/** |
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* @param Request $request |
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* |
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* @return Response |
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*/ |
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public function indexAction(Request $request) |
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{ |
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$options = $request->attributes->get('_route_params'); |
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$this->setModifiedSince($request); |
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$options['Since'] = $this->getModifiedSince(); |
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return $this->createStreamResponse( |
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$options, |
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$request->get('format', 'rss'), |
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$request->get('source', self::DEFAULT_SOURCE) |
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); |
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} |
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/** |
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* Extract the 'If-Modified-Since' value from the headers. |
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* |
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* @return \DateTime |
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*/ |
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protected function getModifiedSince() |
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{ |
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if (is_null($this->since)) { |
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$this->since = new \DateTime('@0'); |
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} |
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return $this->since; |
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} |
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/** |
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* @param Request $request |
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* |
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* @return $this |
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*/ |
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protected function setModifiedSince(Request $request) |
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{ |
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$this->since = new \DateTime(); |
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if ($request->headers->has('If-Modified-Since')) { |
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$string = $request->headers->get('If-Modified-Since'); |
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$this->since = \DateTime::createFromFormat(\DateTime::RSS, $string); |
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} else { |
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$this->since->setTimestamp(1); |
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} |
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return $this; |
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} |
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/** |
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* Generate the HTTP response |
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* 200 : a full body containing the stream |
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* 304 : Not modified. |
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* |
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* @param array $options |
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* @param $format |
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* @param string $source |
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* |
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* @return Response |
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* |
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* @throws \Exception |
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*/ |
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protected function createStreamResponse(array $options, $format, $source = self::DEFAULT_SOURCE) |
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{ |
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$content = $this->getContent($options, $source); |
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if ($this->mustForceRefresh() || $content->getLastModified() > $this->getModifiedSince()) { |
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$formatter = $this->getFormatter($format); |
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$response = new Response($formatter->toString($content)); |
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$response->headers->set('Content-Type', 'application/xhtml+xml'); |
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if (! $this->container->getParameter('debril_rss_atom.private_feeds')) { |
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$response->setPublic(); |
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} |
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$response->setMaxAge(3600); |
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$response->setLastModified($content->getLastModified()); |
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} else { |
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$response = new Response(); |
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$response->setNotModified(); |
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} |
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return $response; |
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} |
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/** |
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* Get the Stream's content using a FeedContentProviderInterface |
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* The FeedContentProviderInterface instance is provided as a service |
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* default : debril.provider.service. |
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* |
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* @param array $options |
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* @param string $source |
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* |
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* @return FeedOutInterface |
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* |
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* @throws \Exception |
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*/ |
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protected function getContent(array $options, $source) |
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{ |
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$provider = $this->get($source); |
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if (!$provider instanceof FeedContentProviderInterface) { |
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throw new \Exception('Provider is not a FeedContentProviderInterface instance'); |
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} |
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try { |
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return $provider->getFeedContent($options); |
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} catch (FeedNotFoundException $e) { |
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throw $this->createNotFoundException('feed not found'); |
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} |
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} |
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/** |
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* Returns true if the controller must ignore the last modified date. |
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* |
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* @return bool |
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*/ |
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protected function mustForceRefresh() |
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{ |
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if ($this->container->hasParameter(self::FORCE_PARAM_NAME)) { |
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return $this->container->getParameter(self::FORCE_PARAM_NAME); |
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} |
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return false; |
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} |
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/** |
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* Get the accurate formatter. |
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* |
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* @param string $format |
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* |
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* @throws \Exception |
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* |
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* @return FeedFormatter |
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*/ |
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protected function getFormatter($format) |
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{ |
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$services = array( |
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'rss' => 'debril.formatter.rss', |
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'atom' => 'debril.formatter.atom', |
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); |
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if (!array_key_exists($format, $services)) { |
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throw new \Exception("Unsupported format {$format}"); |
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} |
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return $this->get($services[$format]); |
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} |
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} |
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alexdebril /
rss-atom-bundle
