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<?php |
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/** |
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* webtrees: online genealogy |
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* Copyright (C) 2021 webtrees development team |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <https://www.gnu.org/licenses/>. |
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*/ |
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declare(strict_types=1); |
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namespace Fisharebest\Webtrees\Http\Middleware; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Message\StreamFactoryInterface; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Psr\Http\Server\RequestHandlerInterface; |
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use function extension_loaded; |
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use function gzdeflate; |
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use function gzencode; |
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use function in_array; |
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use function str_contains; |
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use function strlen; |
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use function strstr; |
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use function strtolower; |
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use function strtr; |
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/** |
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* Middleware to compress (gzip or deflate) a response. |
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*/ |
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class CompressResponse implements MiddlewareInterface |
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{ |
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// Non-text responses that will benefit from compression. |
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protected const MIME_TYPES = [ |
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'application/javascript', |
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'application/json', |
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'application/pdf', |
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'application/vnd.geo+json', |
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'application/xml', |
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'image/svg+xml', |
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]; |
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/** @var StreamFactoryInterface */ |
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protected $stream_factory; |
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/** |
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* CompressResponse constructor. |
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* |
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* @param StreamFactoryInterface $stream_factory |
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*/ |
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public function __construct(StreamFactoryInterface $stream_factory) |
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{ |
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$this->stream_factory = $stream_factory; |
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} |
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/** |
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* @param ServerRequestInterface $request |
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* @param RequestHandlerInterface $handler |
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* |
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* @return ResponseInterface |
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*/ |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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$response = $handler->handle($request); |
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$method = $this->compressionMethod($request); |
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if ($method !== null && $this->isCompressible($response)) { |
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$content = (string) $response->getBody(); |
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switch ($method) { |
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case 'deflate': |
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$content = gzdeflate($content); |
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break; |
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case 'gzip': |
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$content = gzencode($content); |
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break; |
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} |
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if ($content === false) { |
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return $response; |
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} |
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$stream = $this->stream_factory->createStream($content); |
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return $response |
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->withBody($stream) |
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->withHeader('content-encoding', $method) |
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->withHeader('content-length', (string) strlen($content)) |
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->withHeader('vary', 'accept-encoding'); |
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} |
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return $response; |
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} |
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/** |
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* @param RequestInterface $request |
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* |
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* @return string|null |
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*/ |
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protected function compressionMethod(RequestInterface $request): ?string |
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{ |
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$accept_encoding = strtolower($request->getHeaderLine('accept-encoding')); |
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$zlib_available = extension_loaded('zlib'); |
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if ($zlib_available) { |
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if (str_contains($accept_encoding, 'gzip')) { |
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return 'gzip'; |
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} |
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if (str_contains($accept_encoding, 'deflate')) { |
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return 'deflate'; |
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} |
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} |
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return null; |
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} |
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/** |
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* @param ResponseInterface $response |
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* |
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* @return bool |
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*/ |
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protected function isCompressible(ResponseInterface $response): bool |
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{ |
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// Already encoded? |
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if ($response->hasHeader('content-encoding')) { |
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return false; |
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} |
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$content_type = $response->getHeaderLine('content-type'); |
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$content_type = strtr($content_type, [' ' => '']); |
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$content_type = strstr($content_type, ';', true) ?: $content_type; |
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$content_type = strtolower($content_type); |
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if (str_starts_with($content_type, 'text/')) { |
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return true; |
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} |
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return in_array($content_type, static::MIME_TYPES, true); |
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} |
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} |
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fisharebest /
webtrees
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