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<?php |
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namespace Shlinkio\Shlink\Core\Middleware; |
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use Acelaya\ZsmAnnotatedServices\Annotation\Inject; |
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use Doctrine\Common\Cache\Cache; |
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use Interop\Http\ServerMiddleware\DelegateInterface; |
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use Interop\Http\ServerMiddleware\MiddlewareInterface; |
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use Psr\Http\Message\ResponseInterface as Response; |
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use Psr\Http\Message\ServerRequestInterface as Request; |
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use Zend\Diactoros\Response as DiactResp; |
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class QrCodeCacheMiddleware implements MiddlewareInterface |
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{ |
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/** |
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* @var Cache |
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*/ |
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private $cache; |
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/** |
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* QrCodeCacheMiddleware constructor. |
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* @param Cache $cache |
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* |
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* @Inject({Cache::class}) |
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*/ |
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public function __construct(Cache $cache) |
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{ |
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$this->cache = $cache; |
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} |
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/** |
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* Process an incoming server request and return a response, optionally delegating |
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* to the next middleware component to create the response. |
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* |
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* @param Request $request |
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* @param DelegateInterface $delegate |
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* |
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* @return Response |
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*/ |
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public function process(Request $request, DelegateInterface $delegate) |
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{ |
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$cacheKey = $request->getUri()->getPath(); |
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// If this QR code is already cached, just return it |
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if ($this->cache->contains($cacheKey)) { |
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$qrData = $this->cache->fetch($cacheKey); |
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$response = new DiactResp(); |
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$response->getBody()->write($qrData['body']); |
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return $response->withHeader('Content-Type', $qrData['content-type']); |
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} |
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// If not, call the next middleware and cache it |
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/** @var Response $resp */ |
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$resp = $delegate->process($request); |
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$this->cache->save($cacheKey, [ |
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'body' => $resp->getBody()->__toString(), |
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'content-type' => $resp->getHeaderLine('Content-Type'), |
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]); |
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return $resp; |
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} |
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} |
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shlinkio /
shlink
