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<?php declare(strict_types=1); |
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namespace WyriHaximus\React\Http\Middleware; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use React\Cache\ArrayCache; |
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use React\Cache\CacheInterface; |
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use React\Http\Io\HttpBodyStream; |
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use React\Http\Response; |
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use function React\Promise\resolve; |
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use function RingCentral\Psr7\stream_for; |
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final class ResponseCacheMiddleware |
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{ |
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/** |
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* @var array |
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*/ |
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private $staticUrls = []; |
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/** |
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* @var array |
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*/ |
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private $prefixUrls = []; |
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/** |
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* @var CacheInterface |
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*/ |
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private $cache; |
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/** |
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* @param array $urls |
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* @param CacheInterface $cache |
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*/ |
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public function __construct(array $urls, array $headers = [], CacheInterface $cache = null) |
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{ |
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$this->staticUrls = array_filter( |
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$urls, |
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function ($url) { |
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return !(strlen($url) >= 3 && substr($url, -3) === '***'); |
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} |
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); |
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$this->prefixUrls = array_map( |
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function ($url) { |
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return substr($url, 0, -3); |
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}, |
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array_filter( |
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$urls, |
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function ($url) { |
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return strlen($url) >= 3 && substr($url, -3) === '***'; |
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} |
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) |
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); |
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$this->headers = $headers; |
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$this->cache = $cache instanceof CacheInterface ? $cache : new ArrayCache(); |
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} |
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public function __invoke(ServerRequestInterface $request, callable $next) |
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{ |
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if ($request->getMethod() !== 'GET') { |
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return resolve($next($request)); |
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} |
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$uri = $request->getUri()->getPath(); |
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if (!in_array($uri, $this->staticUrls, true) && !$this->matchesPrefixUrl($uri)) { |
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return resolve($next($request)); |
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} |
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$key = $uri; |
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return $this->cache->get($key)->then(function ($json) { |
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$cachedResponse = json_decode($json); |
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return new Response($cachedResponse->code, (array)$cachedResponse->headers, stream_for($cachedResponse->body)); |
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}, function () use ($next, $request, $key) { |
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return resolve($next($request))->then(function (ResponseInterface $response) use ($key) { |
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if ($response->getBody() instanceof HttpBodyStream) { |
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return $response; |
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} |
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$body = (string)$response->getBody(); |
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$headers = []; |
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foreach ($this->headers as $header) { |
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if (!$response->hasHeader($header)) { |
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continue; |
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} |
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$headers[$header] = $response->getHeaderLine($header); |
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} |
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$cachedResponse = json_encode([ |
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'body' => $body, |
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'headers' => $headers, |
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'code' => $response->getStatusCode(), |
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]); |
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$this->cache->set($key, $cachedResponse); |
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return $response->withBody(stream_for($body)); |
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}); |
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}); |
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} |
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private function matchesPrefixUrl(string $uri): bool |
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{ |
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foreach ($this->prefixUrls as $url) { |
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$urlLength = strlen($url); |
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if (substr($uri, 0, $urlLength) === $url) { |
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return true; |
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} |
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} |
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return false; |
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} |
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} |
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WyriHaximus /
reactphp-http-middleware-response-cache
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