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<?php |
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namespace Psr7Middlewares\Middleware; |
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use Psr7Middlewares\Utils; |
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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\StreamInterface; |
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use RuntimeException; |
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/** |
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* Middleware to save the response into a file. |
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*/ |
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class SaveResponse |
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{ |
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use Utils\FileTrait; |
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/** |
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* Execute the middleware. |
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* |
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* @param RequestInterface $request |
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* @param ResponseInterface $response |
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* @param callable $next |
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* |
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* @return ResponseInterface |
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*/ |
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public function __invoke(RequestInterface $request, ResponseInterface $response, callable $next) |
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{ |
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$response = $next($request, $response); |
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if ($this->canSave($request, $response)) { |
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$path = $this->getFilename($request); |
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//if it's gz compressed, append .gz |
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if (strtolower($response->getHeaderLine('Content-Encoding')) === 'gzip') { |
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$path .= '.gz'; |
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} |
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self::writeStream($response->getBody(), $path); |
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} |
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return $response; |
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} |
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/** |
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* Check whether the response can be saved or not. |
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* |
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* @param RequestInterface $request |
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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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private function canSave(RequestInterface $request, ResponseInterface $response) |
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{ |
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if ($request->getMethod() !== 'GET') { |
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return false; |
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} |
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if ($response->getStatusCode() !== 200) { |
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return false; |
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} |
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if (!$this->appendQuery && !empty($request->getUri()->getQuery())) { |
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return false; |
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} |
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if ($response->hasHeader('location')) { |
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return false; |
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} |
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$cacheControl = $response->getHeaderLine('Cache-Control'); |
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if ($cacheControl && (stripos($cacheControl, 'no-cache') !== false || stripos($cacheControl, 'no-store') !== false)) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Write the stream to the given path. |
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* |
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* @param StreamInterface $stream |
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* @param string $path |
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*/ |
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private static function writeStream(StreamInterface $stream, $path) |
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{ |
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$dir = dirname($path); |
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if (!is_dir($dir)) { |
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mkdir($dir, 0777, true); |
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} |
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$handle = fopen($path, 'wb+'); |
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if (false === $handle) { |
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throw new RuntimeException('Unable to write to designated path'); |
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} |
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$stream->rewind(); |
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while (!$stream->eof()) { |
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fwrite($handle, $stream->read(4096)); |
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} |
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fclose($handle); |
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} |
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} |
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oscarotero /
psr7-middlewares
