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<?php |
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namespace Psr7Middlewares; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use RuntimeException; |
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class Middleware |
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{ |
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const KEY = 'Psr7Middlewares\\Middleware'; |
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const STORAGE_KEY = 'STORAGE_KEY'; |
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private static $streamFactory; |
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private static $namespaces = [__NAMESPACE__.'\\Middleware\\']; |
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/** |
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* Register a new namespace. |
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* |
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* @param string $namespace |
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*/ |
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public static function registerNamespace($namespace) |
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{ |
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self::$namespaces[] = $namespace; |
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} |
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/** |
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* Set the stream factory used by some middlewares. |
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* |
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* @param callable $streamFactory |
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*/ |
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public static function setStreamFactory(callable $streamFactory) |
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{ |
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self::$streamFactory = $streamFactory; |
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} |
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/** |
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* Set the stream factory used by some middlewares. |
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* |
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* @param callable|null |
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*/ |
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public static function getStreamFactory() |
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{ |
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return self::$streamFactory; |
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} |
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/** |
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* Create instances of the middlewares. |
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* |
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* @param string $name |
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* @param array $args |
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*/ |
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public static function __callStatic($name, $args) |
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{ |
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foreach (self::$namespaces as $namespace) { |
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$class = $namespace.ucfirst($name); |
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if (class_exists($class)) { |
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switch (count($args)) { |
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case 0: |
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return new $class(); |
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case 1: |
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return new $class($args[0]); |
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default: |
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return (new \ReflectionClass($class))->newInstanceArgs($args); |
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} |
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} |
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} |
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throw new RuntimeException("The middleware {$name} does not exits"); |
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} |
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/** |
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* Create a middleware callable that acts as a "proxy" to a real middleware that must be returned by the given callback. |
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* |
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* @param callable $factory Takes no argument and MUST return a middleware callable or false |
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* |
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* @return callable |
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*/ |
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public static function create(callable $factory) |
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{ |
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return function (RequestInterface $request, ResponseInterface $response, callable $next) use ($factory) { |
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$middleware = $factory($request, $response); |
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if ($middleware === false) { |
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return $next($request, $response); |
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} |
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if (!is_callable($middleware)) { |
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throw new RuntimeException(sprintf('Factory returned "%s" instead of a callable or FALSE.', gettype($middleware))); |
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} |
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return $middleware($request, $response, $next); |
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}; |
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} |
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} |
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oscarotero /
psr7-middlewares
