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<?php |
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namespace Psr7Middlewares; |
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use Psr\Http\Message\StreamInterface; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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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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private static $streamFactory; |
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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 = $streamFactory; |
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} |
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/** |
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* Get the stream factory. |
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* |
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* @return StreamInterface |
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*/ |
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public static function createStream($file = 'php://temp', $mode = 'r+') |
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{ |
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if (empty(self::$streamFactory)) { |
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if (class_exists('Zend\\Diactoros\\Stream')) { |
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return new \Zend\Diactoros\Stream($file, $mode); |
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} |
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throw new \RuntimeException('Unable to create a stream. No stream factory defined'); |
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} |
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return call_user_func(self::$streamFactory, $file, $mode); |
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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, $args) |
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{ |
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$class = __NAMESPACE__.'\\Middleware\\'.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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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 = $factory(); |
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if ($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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* Store an attribute in the request. |
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* |
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* @param ServerRequestInterface $request |
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* @param string $name |
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* @param mixed $value |
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* |
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* @return ServerRequestInterface |
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*/ |
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public static function setAttribute(ServerRequestInterface $request, $name, $value) |
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{ |
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$attributes = $request->getAttribute(self::KEY, []); |
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$attributes[$name] = $value; |
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return $request->withAttribute(self::KEY, $attributes); |
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} |
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/** |
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* Retrieves an attribute from the request. |
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* |
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* @param ServerRequestInterface $request |
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* @param string $name |
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* |
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* @return mixed |
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*/ |
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public static function getAttribute(ServerRequestInterface $request, $name) |
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{ |
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$attributes = $request->getAttribute(self::KEY); |
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if (isset($attributes[$name])) { |
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return $attributes[$name]; |
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} |
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} |
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/** |
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* Check whether an attribute exists. |
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* |
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* @param ServerRequestInterface $request |
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* @param string $name |
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* |
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* @return bool |
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*/ |
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public static function hasAttribute(ServerRequestInterface $request, $name) |
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{ |
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$attributes = $request->getAttribute(self::KEY); |
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if (empty($attributes)) { |
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return false; |
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} |
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return array_key_exists($name, $attributes); |
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} |
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} |
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oscarotero /
psr7-middlewares
