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<?php |
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namespace Psr7Middlewares\Utils; |
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use RuntimeException; |
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use Psr7Middlewares\Utils; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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/** |
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* Utilities used by middlewares with callables. |
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*/ |
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trait CallableTrait |
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{ |
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private $arguments = []; |
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/** |
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* Extra arguments passed to the callable. |
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* |
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* @return self |
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*/ |
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public function arguments() |
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{ |
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$this->arguments = func_get_args(); |
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return $this; |
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} |
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/** |
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* Execute the callable. |
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* |
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* @param mixed $target |
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* @param RequestInterface $request |
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* @param ResponseInterface $response |
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* |
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* @return ResponseInterface |
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*/ |
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private function executeCallable($target, RequestInterface $request, ResponseInterface $response) |
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{ |
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ob_start(); |
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$level = ob_get_level(); |
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try { |
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$arguments = array_merge([$request, $response], $this->arguments); |
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$target = self::getCallable($target, $arguments); |
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$return = call_user_func_array($target, $arguments); |
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if ($return instanceof ResponseInterface) { |
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$response = $return; |
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$return = ''; |
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} |
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$return = Utils\Helpers::getOutput($level).$return; |
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$body = $response->getBody(); |
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if ($return !== '' && $body->isWritable()) { |
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$body->write($return); |
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} |
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return $response; |
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} catch (\Exception $exception) { |
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Utils\Helpers::getOutput($level); |
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throw $exception; |
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} |
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} |
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/** |
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* Resolves the target of the route and returns a callable. |
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* |
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* @param mixed $target |
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* @param array $construct_args |
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* |
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* @throws RuntimeException If the target is not callable |
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* |
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* @return callable |
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*/ |
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private static function getCallable($target, array $construct_args) |
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{ |
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if (empty($target)) { |
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throw new RuntimeException('No callable provided'); |
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} |
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if (is_string($target)) { |
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//is a class "classname::method" |
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if (strpos($target, '::') === false) { |
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$class = $target; |
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$method = '__invoke'; |
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} else { |
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list($class, $method) = explode('::', $target, 2); |
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} |
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if (!class_exists($class)) { |
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throw new RuntimeException("The class {$class} does not exists"); |
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} |
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$fn = new \ReflectionMethod($class, $method); |
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if (!$fn->isStatic()) { |
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$class = new \ReflectionClass($class); |
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$instance = $class->hasMethod('__construct') ? $class->newInstanceArgs($construct_args) : $class->newInstance(); |
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$target = [$instance, $method]; |
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} |
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} |
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//if it's callable as is |
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if (is_callable($target)) { |
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return $target; |
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} |
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throw new RuntimeException('Invalid callable provided'); |
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} |
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} |
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oscarotero /
psr7-middlewares
