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<?php |
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declare(strict_types = 1); |
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namespace Zakirullin\Middlewares; |
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use Closure; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Psr\Http\Server\RequestHandlerInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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class Conditional implements MiddlewareInterface |
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{ |
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/** |
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* @var callable |
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*/ |
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protected $shouldUseCallback; |
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/** |
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* @var callable |
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*/ |
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protected $getMiddlewareCallback; |
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/** |
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* @param callable $shouldUseCallback |
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* @param callable $getMiddlewareCallback |
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*/ |
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public function __construct( |
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callable $shouldUseCallback, |
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callable $getMiddlewareCallback |
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) { |
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$this->shouldUseCallback = $shouldUseCallback; |
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$this->getMiddlewareCallback = $getMiddlewareCallback; |
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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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* @return ResponseInterface |
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*/ |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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$shouldUse = call_user_func($this->shouldUseCallback, $request); |
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if ($shouldUse) { |
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/** |
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* @var MiddlewareInterface $middleware |
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*/ |
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$middleware = call_user_func($this->getMiddlewareCallback); |
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if ($middleware instanceof Closure) { |
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$middleware = $this->createMiddlewareFromClosure($middleware); |
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} |
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return $middleware->process($request, $handler); |
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} else { |
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return $handler->handle($request); |
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} |
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} |
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/** |
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* @param Closure $handler |
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* @return MiddlewareInterface |
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*/ |
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protected function createMiddlewareFromClosure(Closure $handler): MiddlewareInterface |
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{ |
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return new class($handler) implements MiddlewareInterface { |
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private $handler; |
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public function __construct(Closure $handler) |
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{ |
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$this->handler = $handler; |
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} |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $next): ResponseInterface |
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{ |
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return call_user_func($this->handler, $request, $next); |
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} |
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}; |
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} |
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} |
zakirullin /
conditional-middleware
