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<?php |
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/* |
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* This file is part of the Scrawler package. |
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* |
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* (c) Pranjal Pandey <[email protected]> |
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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 Scrawler; |
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use Scrawler\Interfaces\MiddlewareInterface; |
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final class Pipeline |
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{ |
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/** |
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* Create a new pipeline. |
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* |
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* @param array<\Closure> $middlewares |
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*/ |
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public function __construct( |
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private array $middlewares = [], |
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) { |
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} |
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/** |
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* Add middleware(s) or Pipeline. |
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* |
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* @template T of MiddlewareInterface |
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* |
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* @param array<callable|\Closure|class-string<T>> $middlewares |
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* |
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* @return array<\Closure> |
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*/ |
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public function validateMiddleware(array $middlewares): array |
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{ |
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$validated = []; |
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foreach ($middlewares as $middleware) { |
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if (is_string($middleware)) { |
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if (class_exists($middleware)) { |
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$middlewareObj = new $middleware(); |
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if ($middlewareObj instanceof MiddlewareInterface) { |
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$callable = $middlewareObj->run(...); |
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$middleware = \Closure::fromCallable(callback: $callable); |
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} else { |
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throw new Exception\InvalidMiddlewareException('Middleware class does not implement MiddlewareInterface'); |
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} |
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} else { |
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throw new Exception\InvalidMiddlewareException('Middleware class does not exist'); |
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} |
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} |
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$middleware = \Closure::fromCallable(callback: $middleware); |
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$this->validateClosure($middleware); |
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$validated[] = $middleware; |
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} |
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return $validated; |
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} |
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private function validateClosure(\Closure $middleware): void |
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{ |
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$refFunction = new \ReflectionFunction($middleware); |
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$parameters = $refFunction->getParameters(); |
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foreach ($parameters as $parameter) { |
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if ('request' === $parameter->getName() && Http\Request::class != $parameter->getType()) { |
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throw new Exception\InvalidMiddlewareException('First parameter of middleware must be of type Scrawler\Http\Request'); |
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} |
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if ('next' === $parameter->getName() && 'Closure' != $parameter->getType()) { |
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throw new Exception\InvalidMiddlewareException('Second parameter of middleware must be of type Closure'); |
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} |
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if ('request' !== $parameter->getName() && 'next' !== $parameter->getName()) { |
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throw new Exception\InvalidMiddlewareException('Invalid parameter name in middleware'); |
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} |
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} |
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} |
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/** |
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* Add middleware(s) or Pipeline. |
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* |
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* @param array<\Closure> $middlewares |
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*/ |
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public function middleware(array $middlewares): self |
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{ |
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$this->middlewares = $middlewares; |
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return $this; |
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} |
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/** |
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* Run middleware around core function and pass an |
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* object through it. |
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*/ |
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public function run(mixed $object, \Closure $core): mixed |
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{ |
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$coreFunction = $this->createCoreFunction($core); |
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$middlewares = array_reverse($this->middlewares); |
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$completePipeline = array_reduce($middlewares, fn ($nextMiddleware, $middleware): \Closure => $this->createMiddleware($nextMiddleware, $middleware), $coreFunction); |
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return $completePipeline($object); |
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} |
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/** |
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* The inner function of the onion. |
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* This function will be wrapped on layers. |
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* |
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* @param \Closure $core the core function |
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* |
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* @return \Closure |
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*/ |
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private function createCoreFunction(\Closure $core) |
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{ |
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return fn ($object) => $core($object); |
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} |
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/** |
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* Get an pipeline middleware function. |
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* This function will get the object from a previous layer and pass it inwards. |
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*/ |
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private function createMiddleware(\Closure $nextMiddleware, \Closure $middleware): \Closure |
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{ |
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return fn ($object) => $middleware($object, $nextMiddleware); |
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} |
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} |
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scrawler-labs /
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