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<?php declare(strict_types=1); |
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namespace WyriHaximus\React\Http\Middleware; |
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use Lcobucci\Clock\Clock; |
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use Lcobucci\Clock\SystemClock; |
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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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const PREFIX_WITHOUT_QUERY = '***'; |
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const PREFIX_WITH_QUERY = '???'; |
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const PREFIXES = [ |
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self::PREFIX_WITH_QUERY, |
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self::PREFIX_WITHOUT_QUERY, |
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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 $prefixUrlsWithoutQuery = []; |
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/** |
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* @var array |
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*/ |
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private $prefixUrlsWithQuery = []; |
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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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* @var Clock |
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*/ |
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private $clock; |
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/** |
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* @param array $urls |
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* @param array $headers |
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* @param CacheInterface|null $cache |
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* @param Clock $clock |
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*/ |
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public function __construct(array $urls, array $headers = [], CacheInterface $cache = null, Clock $clock = null) |
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{ |
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$this->sortUrls($urls); |
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$this->headers = $headers; |
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$this->cache = $cache instanceof CacheInterface ? $cache : new ArrayCache(); |
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$this->clock = $clock instanceof Clock ? $clock : new SystemClock(); |
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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 = $uri; |
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$query = $request->getUri()->getQuery(); |
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if (strlen($query) > 0 && $this->queryInKey($uri)) { |
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$key .= '?' . $query; |
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} |
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return $this->cache->get($key)->then(function ($json) { |
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$cachedResponse = json_decode($json); |
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$headers = (array)$cachedResponse->headers; |
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// Todo at 2 October 2018 remove the check around this assignment |
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if (isset($cachedResponse->time)) { |
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$headers['Age'] = (int)$this->clock->now()->format('U') - (string)$cachedResponse->time; |
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} |
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return new Response($cachedResponse->code, $headers, stream_for($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' => $response->getStatusCode(), |
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'time' => (int)$this->clock->now()->format('U'), |
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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 sortUrls(array $urls) |
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{ |
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foreach ($urls as $url) { |
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if (!(strlen($url) >= 3 && in_array(substr($url, -3), self::PREFIXES, true))) { |
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$this->staticUrls[] = $url; |
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continue; |
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} |
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if (strlen($url) >= 3 && substr($url, -3) === self::PREFIX_WITHOUT_QUERY) { |
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$this->prefixUrlsWithoutQuery[] = substr($url, 0, -3); |
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continue; |
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} |
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if (strlen($url) >= 3 && substr($url, -3) === self::PREFIX_WITH_QUERY) { |
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$this->prefixUrlsWithQuery[] = substr($url, 0, -3); |
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continue; |
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} |
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} |
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} |
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private function matchesPrefixUrl(string $uri): bool |
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{ |
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if ($this->urlMatchesPrefixes($this->prefixUrlsWithoutQuery, $uri)) { |
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return true; |
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} |
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return $this->urlMatchesPrefixes($this->prefixUrlsWithQuery, $uri); |
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} |
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private function queryInKey(string $uri): bool |
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{ |
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return $this->urlMatchesPrefixes($this->prefixUrlsWithQuery, $uri); |
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} |
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private function urlMatchesPrefixes(array $urls, string $uri): bool |
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{ |
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foreach ($urls 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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