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<?php |
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namespace Obsidian\Middleware; |
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use Closure; |
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use Exception; |
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use Psr\Http\Message\ResponseInterface; |
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/** |
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* Allow objects to have middleware |
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*/ |
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trait HasMiddlewareTrait { |
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/** |
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* Array of all registered middleware |
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* |
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* @var array |
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*/ |
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protected $middleware = []; |
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/** |
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* Check if the passed entity is a valid middleware |
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* |
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* @param mixed $middleware |
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* @return boolean |
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*/ |
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protected function isMiddleware( $middleware ) { |
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if ( is_callable( $middleware ) ) { |
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return true; |
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} |
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return is_a( $middleware, MiddlewareInterface::class, true ); |
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} |
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/** |
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* Get registered middleware |
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* |
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* @return array |
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*/ |
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public function getMiddleware() { |
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return $this->middleware; |
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} |
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/** |
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* Add middleware |
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* Accepts: a class name, an instance of a class, a callable, an array of any of the previous |
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* |
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* @param string|callable|\Obsidian\Middleware\MiddlewareInterface|array $middleware |
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* @return object $this |
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*/ |
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public function addMiddleware( $middleware ) { |
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if ( is_callable( $middleware ) && is_array( $middleware ) ) { |
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$middleware = [$middleware]; |
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} |
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if ( ! is_array( $middleware ) ) { |
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$middleware = [$middleware]; |
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} |
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foreach ( $middleware as $item ) { |
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if ( ! $this->isMiddleware( $item ) ) { |
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throw new Exception( 'Passed middleware must be a callable or the name or instance of a class which implements the ' . MiddlewareInterface::class . ' interface.' ); |
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} |
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} |
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$this->middleware = array_merge( $this->getMiddleware(), $middleware ); |
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return $this; |
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} |
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/** |
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* Alias for addMiddleware |
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* |
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* @codeCoverageIgnore |
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* @param string|callable|\Obsidian\Middleware\middlewareInterface|array $middleware |
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* @return object $this |
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*/ |
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public function add( $middleware ) { |
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return call_user_func_array( [$this, 'addMiddleware'], func_get_args() ); |
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} |
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/** |
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* Execute an array of middleware recursively (last in, first out) |
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* |
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* @param array $middleware |
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* @param \Obsidian\Request $request |
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* @param Closure $next |
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* @return ResponseInterface |
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*/ |
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public function executeMiddleware( $middleware, $request, Closure $next ) { |
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$top_middleware = array_pop( $middleware ); |
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if ( $top_middleware === null ) { |
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return $next( $request ); |
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} |
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$top_middleware_next = function( $request ) use ( $middleware, $next ) { |
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return $this->executeMiddleware( $middleware, $request, $next ); |
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}; |
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if ( is_callable( $top_middleware ) ) { |
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return call_user_func( $top_middleware, $request, $top_middleware_next ); |
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} |
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$instance = new $top_middleware(); |
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return $instance->handle( $request, $top_middleware_next ); |
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} |
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} |
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htmlburger /
wpemerge
