README

No longer maintained

Create callable middlewares instead. Signature:

function (RequestInterface $request, ResponseInterface $response, callable $next) {
    // Do something with the request before passing it on.
    ...

    // Pass on to next middleware.
    $response = $next($request, $response);

    // Do something with the response after the next middleware has been called.
    ...

    // Return ultimate response object.
    return $response;
}

PSR-7 middlewares

Stackable middlewares for PSR-7 HTTP message objects.

Installation

composer require hannesvdvreken/psr7-middlewares

Description

This package is a small library that helps you to construct a decorated array of middlewares.

There are 2 types of middlewares:

A Kernel, which is a middleware which can pass on the Request and Response object to the next layer. A Core object is usually the last layer of a list of middlewares. A core will always return a PSR-7 ResponseInterface object and never pass on the given RequestInterface object to a next layer. It will never have a next middleware set.

The Builder object helps in creating a composed Core which consists of a specified list of layers. Note that the builder object is immutable: thus it returns a different mutated object after each push and unshift call.

use Psr7Stack\Builder;

$builder = new Builder();

$session = new SessionMiddleware();
$throttle = new TrottleMiddleware();
$app = new App();

$builder = $buider->push($session)->push($throttle)->push($app);

$stack = $builder->resolve();

The returned Stack object can also be created with the static factory method create.

use Psr7Stack\Stack;

$stack = Stack::create([$session, $throttle, $app]);

The Stack object itself is also a Core middleware, so it can be used in a different composition of middlewares. This is how you can send a Request object through the different layers of middlewares:

$psrResponse = $stack->handle($psrRequest);

Extending

Creating a Core yourself:

use Psr7Stack\Core;
use Psr\Http\Message\RequestInterface;

class App implements Core
{
    /**
     * @param \Psr\Http\Message\RequestInterface $request
     *
     * @request \Psr\Http\Message\ResponseInterface
     */
    public function handle(RequestInterface $request)
    {
        // Call the router and return the response.
        return $response;
    }
}

Creating a Kernel:

use Psr7Stack\Kernel;
use Psr7Stack\Traits\NextCore;

class SessionMiddleware implements Kernel
{
    // Use trait to implement the setNextCore method.
    use NextCore;

    /**
     * @param \Psr\Http\Message\RequestInterface $request
     *
     * @request \Psr\Http\Message\ResponseInterface
     */
    public function handle(RequestInterface $request)
    {
        // Call the next core and return the response.
        $response = $this->next->handle($request);

        // Do something with the response and return it.
        ...

        return $response;
    }
}

Middlewares

Existing

• League/route application core

Ideas for more middlewares

• Robots middleware. To return an environment specific robots.txt file.
• Any type of framework application
• Throttle middleware
• CORS middleware
• Cache middleware
• IP based Firewall middleware
• Logger middleware

Contributing

Contributions are welcome. See the contributions file to know how to contribute.

License

The MIT License (MIT). Please see License File for more information.