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<?php declare(strict_types = 1); |
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namespace jschreuder\Middle; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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final class ApplicationStack implements ApplicationStackInterface |
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{ |
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/** @var \SplStack | HttpMiddlewareInterface[] */ |
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private $stack; |
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public function __construct(array $middlewares = []) |
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{ |
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$this->stack = new \SplStack(); |
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foreach ($middlewares as $middleware) { |
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if (!$middleware instanceof HttpMiddlewareInterface) { |
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throw new \InvalidArgumentException('All middlewares must implement ApplicationInterface'); |
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} |
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$this->stack->push($middleware); |
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} |
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} |
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public function withMiddleware(HttpMiddlewareInterface $middleware) : ApplicationStack |
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{ |
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$stack = clone $this; |
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$stack->stack = clone $this->stack; |
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$stack->stack->push($middleware); |
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return $stack; |
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} |
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public function withoutMiddleware(HttpMiddlewareInterface $middleware) : ApplicationStack |
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{ |
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$oldStack = clone $this->stack; |
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$newStack = new \SplStack(); |
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while (!$oldStack->isEmpty()) { |
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$middlewareInstance = $oldStack->shift(); |
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if ($middlewareInstance !== $middleware) { |
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$newStack->push($middlewareInstance); |
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} |
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} |
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$stack = clone $this; |
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$stack->stack = $newStack; |
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return $stack; |
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} |
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public function process(ServerRequestInterface $request) : ResponseInterface |
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{ |
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if ($this->stack->count() === 0) { |
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throw new \RuntimeException('Cannot process with an empty stack'); |
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} |
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$stack = clone $this->stack; |
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/** @var HttpMiddlewareInterface $current */ |
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$current = $stack->pop(); |
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$response = $current->process($request, new Delegate($stack)); |
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return $response; |
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} |
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} |
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jschreuder /
Middle
