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<?php |
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/** |
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* This file is part of slick/http |
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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 Slick\Http\Server\Middleware; |
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use Psr\Http\Server\MiddlewareInterface; |
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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\Server\RequestHandlerInterface; |
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use Slick\Http\Message\Response; |
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use Slick\Http\Message\Stream\TextStream; |
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use Slick\Http\Server\Exception\UnexpectedValueException; |
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/** |
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* Callable Middleware |
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* |
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* @package Slick\Http\Server\Middleware |
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*/ |
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class CallableMiddleware implements MiddlewareInterface |
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{ |
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/** |
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* @var callable |
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*/ |
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private $callable; |
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/** |
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* Creates a callable Middleware |
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* |
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* @param callable $callable |
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*/ |
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public function __construct(callable $callable) |
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{ |
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$this->callable = $callable; |
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} |
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/** |
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* @param callable $callable |
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* @param array $arguments |
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* |
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* @return ResponseInterface |
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*/ |
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public static function execute(callable $callable, array $arguments) |
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{ |
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$return = call_user_func_array($callable, $arguments); |
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if ($return instanceof ResponseInterface) { |
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return $return; |
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} |
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$canBeUsedAsText = is_null($return) |
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|| is_scalar($return) |
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|| (is_object($return) && method_exists($return, '__toString')); |
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if (! $canBeUsedAsText) { |
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throw new UnexpectedValueException( |
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'The value returned must be scalar or an object with __toString method' |
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); |
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} |
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return new Response(200, new TextStream((string) $return)); |
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} |
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/** |
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* Process an incoming server request and return a response, optionally delegating |
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* response creation to an handler. |
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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( |
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ServerRequestInterface $request, |
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RequestHandlerInterface $handler |
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): ResponseInterface { |
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$response = self::execute($this->callable, [$request, $handler]); |
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if (!$response instanceof ResponseInterface) { |
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throw new UnexpectedValueException( |
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sprintf('The middleware must return an instance of %s', ResponseInterface::class) |
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); |
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} |
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return $response; |
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} |
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} |
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slickframework /
http
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