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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 RingCentral\Psr7\Response; |
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use function RingCentral\Psr7\stream_for; |
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final class CacheConfiguration implements CacheConfigurationInterface |
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{ |
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private const PREFIX_WITHOUT_QUERY = '***'; |
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private const PREFIX_WITH_QUERY = '???'; |
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private 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 array |
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*/ |
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private $headers; |
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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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* @var null|callable |
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*/ |
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private $ttl; |
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/** |
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* @param array $urls |
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* @param array $headers |
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* @param Clock|null $clock |
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* @param callable|null $ttl |
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*/ |
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public function __construct(array $urls, array $headers = [], Clock $clock = null, callable $ttl = null) |
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{ |
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$this->sortUrls($urls); |
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$this->headers = $headers; |
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$this->clock = $clock instanceof Clock ? $clock : new SystemClock(); |
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$this->ttl = $ttl; |
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} |
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public function requestIsCacheable(ServerRequestInterface $request): bool |
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{ |
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if ($request->getMethod() !== 'GET') { |
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return false; |
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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 false; |
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} |
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return true; |
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} |
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public function responseIsCacheable(ServerRequestInterface $request, ResponseInterface $response): bool |
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{ |
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return true; |
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} |
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public function cacheKey(ServerRequestInterface $request): string |
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{ |
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$key = $request->getUri()->getPath(); |
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$query = $request->getUri()->getQuery(); |
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if (\strlen($query) > 0 && $this->queryInKey($key)) { |
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$key .= '?' . $query; |
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} |
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return $key; |
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} |
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public function cacheTtl(ServerRequestInterface $request, ResponseInterface $response): ?int |
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{ |
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if ($this->ttl === null) { |
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return null; |
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} |
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return ($this->ttl)($request, $response); |
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} |
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public function cacheEncode(ResponseInterface $response): string |
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{ |
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$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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return msgpack_pack([ |
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'code' => $response->getStatusCode(), |
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'time' => (int)$this->clock->now()->format('U'), |
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'headers' => $headers, |
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'body' => (string)$response->getBody(), |
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]); |
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} |
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public function cacheDecode(string $response): ResponseInterface |
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{ |
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$response = msgpack_unpack($response); |
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$response['headers'] = (array)$response['headers']; |
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$response['headers']['Age'] = (int)$this->clock->now()->format('U') - (int)$response['time']; |
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return new Response($response['code'], $response['headers'], stream_for($response['body'])); |
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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 $url) { |
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if (strpos($uri, $url) === 0) { |
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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
