Yiisoft\Router\MiddlewareStack

Complexity

Total Complexity

3

Size/Duplication

Total Lines	59
Duplicated Lines	0 %

Importance

Changes	1
Bugs	0	Features	0

8 Methods

Rating	Name	Duplication	Size	Complexity
A	handle()	0	7	2
A	hp$0 ➔ handle()	0	3	1
A	hp$0 ➔ wrap()	0	15	1
A	isEmpty()	0	3	1
	wrap()	0	15	?
A	build()	0	11	2
A	hp$0 ➔ __construct()	0	4	1
A	reset()	0	3	1

<?php

declare(strict_types=1);

namespace Yiisoft\Router;

use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;

final class MiddlewareStack implements MiddlewareStackInterface
{
    /**
     * Contains a stack of middleware wrapped in handlers.
     * Each handler points to the handler of middleware that will be processed next.
     * @var RequestHandlerInterface|null stack of middleware
     */
    private ?RequestHandlerInterface $stack = null;

    public function build(array $middlewares, RequestHandlerInterface $fallbackHandler): MiddlewareStackInterface
    {
        $handler = $fallbackHandler;
        foreach ($middlewares as $middleware) {
            $handler = $this->wrap($middleware, $handler);
        }

        $new = clone $this;
        $new->stack = $handler;

        return $new;
    }

    public function handle(ServerRequestInterface $request): ResponseInterface
    {
        if ($this->isEmpty()) {
            throw new \RuntimeException('Stack is empty.');
        }

        return $this->stack->handle($request);
    }

    public function reset(): void
    {
        $this->stack = null;
    }

    public function isEmpty(): bool
    {
        return $this->stack === null;
    }

    /**
     * Wraps handler by middlewares
     */
    private function wrap(MiddlewareInterface $middleware, RequestHandlerInterface $handler): RequestHandlerInterface
    {
        return new class($middleware, $handler) implements RequestHandlerInterface {
            private MiddlewareInterface $middleware;
            private RequestHandlerInterface $handler;

            public function __construct(MiddlewareInterface $middleware, RequestHandlerInterface $handler)
            {
                $this->middleware = $middleware;
                $this->handler = $handler;
            }

            public function handle(ServerRequestInterface $request): ResponseInterface
            {
                return $this->middleware->process($request, $this->handler);
            }
        };
    }
}