PSRs & Middleware Pipeline

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PSRs & Middleware Pipeline
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PSRs & Middleware Pipeline
This interfaces are already (and amazingly) implemented by Laminas at projects: Diactoros and Stratigility. Siler wraps them and exposes a function-friendly API handling state internally while achieving a fully-featured and declarative way for: Middleware Pipelining.
PSR-7 HTTP Messages
Siler doesn't have direct dependencies, to stay fit, it favors peer dependencies, which means you have to explicitly declare a diactoros dependency in your project in order to use it.
composer require laminas/laminas-diactoros
You can create a superglobals seeded ServerRequest with Siler\Diactoros\request():
use Siler\Diactoros;
​
$request = Diactoros\request();
And create Responses through helpers:
$json = Diactoros\json(['some' => 'data']);
$html = Diactoros\html('<p>some markup</p>');
$text = Diactoros\text('plain text');
If none of them fits your needs, you can create a raw Response:
$response = Diactoros\response();
$response->getBody()->write('something');
To emit a Response, there is no big deal, if you got Siler, you already imagined that is about one or two function calls, but this time we get the help from HttpHandlerRunner:
composer require laminas/laminas-httphandlerrunner
Then
HttpHandlerRunner\sapi_emit($response);
As in Siler\Http\Response namespace functions, the HttpHandlerRunner\sapi_emit will output headers and text to the buffer, use it carefully.
Example:
<?php declare(strict_types=1);
​
require_once 'vendor/autoload.php';
​
use Siler\Diactoros;
use Siler\HttpHandlerRunner;
use Siler\Route;
use function Siler\array_get;
​
$request = Diactoros\request();
$response = Route\match([
    // /greet/Leo?salute=Hello
    Route\get('/greet/{name}', function ($params) use ($request) {
        $salute = array_get($request->getQueryParams(), 'salute', 'Olá');
        return Diactoros\text("{$salute} {$params['name']}");
    }, $request),
​
    Route\get('/', function () {
        return Diactoros\text('hello world');
    }, $request),
​
    Diactoros\text('not found', 404),
]);
​
HttpHandlerRunner\sapi_emit($response);
PSR-15 Middleware Pipelining
composer require laminas/laminas-stratigility
Siler doesn't have direct dependencies, to stay fit, it favors peer dependencies, which means you have to explicitly declare a stratigility dependency in your project in order to use it.
A very simple Hello World example:
use function Siler\Diactoros\request;
use function Siler\Diactoros\text;
use function Siler\HttpHandlerRunner\sapi_emit;
use function Siler\Stratigility\handle;
use function Siler\Stratigility\pipe;
​
pipe(function ($request, $handler) {
    return text('hello world');
});
​
sapi_emit(handle(request()));
It's more uses than actual code because Siler is abstracting all the way down for you.
API
Description
pipe
Creates a Stratigility MiddlewarePipe with a default name and pipes the given Clousure to it already wrapping it inside a MiddlewareInterface decorator, or you can pass any implementation MiddlewareInterface to it.
text
Creates a Diactoros TextResponse. The Diactoros namespace in Siler is basically just helper functions for Responses.
sapi_emit
Creates and immediately calls emit method on a HttpHandlerRunner SapiEmitter.
handle
Calls handle on a MiddlewarePipe marshaling the Request.
request
Creates a Diactoros ServerRequest using PHP's Globals.
Siler's Routes
You can also run pipelines for specific routes:
use Siler\Diactoros;
use Siler\Http\Request;
use Siler\HttpHandlerRunner;
use Siler\Route;
use Siler\Stratigility;
​
$userMiddleware = function ($request, $handler) {
    $token = Request\get('token');
​
    if (empty($token)) {
        return Diactoros\json('no user', 401);
    }
​
    $user = "get_user_by_token:$token";
    $request = $request->withAttribute('user', $user);
​
    return $handler->handle($request);
};
​
$homeHandler = function () {
    return Diactoros\json('welcome');
};
​
$adminHandler = function ($request) {
    return Diactoros\json(['user' => $request->getAttribute('user')]);
};
​
$secretHandler = function ($request) {
    return Diactoros\json(['user' => $request->getAttribute('user')]);
};
​
Stratigility\pipe($userMiddleware, 'auth');
​
$request = Diactoros\request();
$response = Route\match([
    Route\get('/', $homeHandler, $request),
    Route\get('/admin', Stratigility\process($request, 'auth')($adminHandler), $request),
    Route\get('/secret', Stratigility\process($request, 'auth')($secretHandler), $request),
    Diactoros\json('not found', 404),
]);
​
HttpHandlerRunner\sapi_emit($response);
The second argument on pipe here is a Pipeline name, you can pipe middlewares to any number of pipelines, then in Stratigility\process we marshal it, from the given $request and returns a Closure to be called on a final handler.
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Outline
PSR-7 HTTP Messages
PSR-15 Middleware Pipelining
Siler's Routes