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<?php |
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declare(strict_types=1); |
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/* |
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* This file is part of Flight Routing. |
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* |
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* PHP version 7.1 and above required |
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* |
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* @author Divine Niiquaye Ibok <[email protected]> |
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* @copyright 2019 Biurad Group (https://biurad.com/) |
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* @license https://opensource.org/licenses/BSD-3-Clause License |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Flight\Routing; |
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use JsonSerializable; |
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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\StreamInterface; |
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use Psr\Http\Server\RequestHandlerInterface; |
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use stdClass; |
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use Throwable; |
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/** |
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* Provides ability to invoke any handler and write it's response into ResponseInterface. |
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* |
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* @author Divine Niiquaye Ibok <[email protected]> |
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*/ |
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final class RouteHandler implements RequestHandlerInterface |
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{ |
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public const CONTENT_TYPE = 'Content-Type'; |
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/** @var callable */ |
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private $callable; |
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/** @var ResponseInterface */ |
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private $responseFactory; |
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/** |
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* @param callable $callable |
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* @param ResponseInterface $responseFactory |
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*/ |
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public function __construct(callable $callable, ResponseInterface $responseFactory) |
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{ |
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$this->callable = $callable; |
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$this->responseFactory = $responseFactory; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @throws Throwable |
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*/ |
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public function handle(ServerRequestInterface $request): ResponseInterface |
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{ |
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$outputLevel = \ob_get_level(); |
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\ob_start(); |
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$output = ''; |
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$result = null; |
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$response = $this->responseFactory |
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->withHeader(self::CONTENT_TYPE, 'text/html; charset=utf-8'); |
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try { |
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$result = ($this->callable)($request, $response); |
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1 |
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} catch (Throwable $e) { |
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\ob_get_clean(); |
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throw $e; |
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} finally { |
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while (\ob_get_level() > $outputLevel + 1) { |
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$output = \ob_get_clean() . $output; |
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} |
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} |
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return $this->wrapResponse($response, $result, \ob_get_clean() . $output); |
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} |
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/** |
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* Convert endpoint result into valid PSR 7 response. |
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* content-type fallback is "text/html; charset=utf-8". |
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* |
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* @param ResponseInterface $response initial pipeline response |
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* @param mixed $result generated endpoint output |
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* @param string $output buffer output |
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* |
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* @return ResponseInterface |
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*/ |
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private function wrapResponse(ResponseInterface $response, $result = null, string $output = ''): ResponseInterface |
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{ |
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// Always return the response... |
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if ($result instanceof ResponseInterface) { |
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if (!empty($output) && $result->getBody()->isWritable()) { |
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$result->getBody()->write($output); |
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} |
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return $result; |
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} |
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if (\is_array($result) || $result instanceof JsonSerializable || $result instanceof stdClass) { |
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$result = \json_encode($result); |
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} |
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$response->getBody()->write((string) $result); |
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$response->getBody()->write($output); |
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//Always detect response anf glue buffered output |
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return $this->detectResponse($response); |
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} |
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private function detectResponse(ResponseInterface $response): ResponseInterface |
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{ |
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if ($this->isJson($response->getBody())) { |
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return $response->withHeader(self::CONTENT_TYPE, 'application/json'); |
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} |
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if ($this->isXml($response->getBody())) { |
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return $response->withHeader(self::CONTENT_TYPE, 'application/xml; charset=utf-8'); |
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} |
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// Set content-type to plain text if string doesn't contain </html> tag. |
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if (0 === \preg_match('/(.*)(<\/html[^>]*>)/i', (string) $response->getBody())) { |
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return $response->withHeader(self::CONTENT_TYPE, 'text/plain; charset=utf-8'); |
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} |
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return $response; |
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} |
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private function isJson(StreamInterface $stream): bool |
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{ |
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$stream->rewind(); |
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\json_decode($stream->getContents(), true); |
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return \JSON_ERROR_NONE === \json_last_error(); |
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} |
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private function isXml(StreamInterface $stream): bool |
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{ |
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$stream->rewind(); |
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$previousValue = \libxml_use_internal_errors(true); |
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$isXml = \simplexml_load_string($contents = $stream->getContents()); |
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\libxml_use_internal_errors($previousValue); |
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return false !== $isXml && false !== \strpos($contents, '<?xml'); |
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} |
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} |
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divineniiquaye /
flight-routing
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