DevTalk Zoox sobre PSR-7, Middlewares PHP e Zend Expressive

1. ZOOX
DEVTALK #2
PSR-7 E MIDDLEWARES
JULHO / 2016

2. PSR – O QUE SIGNIFICA?
PHP
Standards
Recommendations
Número Título
1 Basic Coding Standard
2 Coding Style Guide
3 Logger Interface
4 Autoloading Standard
6 Caching Interface
7 HTTP Message Interface

3. PSR7 – MESSAGES
• Request
POST /path HTTP/1.1
Host: example.com
foo=bar&baz=bat
• PsrHttpMessageRequestInterface
• Response
HTTP/1.1 200 OK
Content-Type: text/plain
This is the response body
• PsrHttpMessageResponseInterface

4. PSR7 - HEADERS
$message = $message->withHeader('foo', 'bar');
echo $message->getHeaderLine('foo');
// bar
echo $message->getHeaderLine('FOO');
// bar
$message = $message->withHeader('fOO', 'baz');
echo $message->getHeaderLine('foo');
// baz
$message = $message
->withHeader('foo', 'bar')
->withAddedHeader('foo', 'baz');
$header = $message->getHeaderLine('foo');
// 'bar, baz'
$header = $message->getHeader('foo');
// ['bar', 'baz']

5. PHP MIDDLEWARES
• Um middleware recebe uma Request, uma Response e faz algo
com elas.
• Todo middleware DEVE retornar uma
PsrHttpMessageResponseInterface
• Todo middleware pode chamar o próximo da fila

6. MIDDLEWARE - EXEMPLO
<?php
/**
* Exemplo de um middleware
*
* @param PsrHttpMessageServerRequestInterface $request PSR7 request
* @param PsrHttpMessageResponseInterface $response PSR7 response
* @param callable $next Próximo
*
* @return PsrHttpMessageResponseInterface
*/
function ($request, $response, $next)
{
$response->getBody()->write('BEFORE');
$response = $next($request, $response);
$response->getBody()->write('AFTER');
return $response;
};

7. FLUXO COM MIDDLEWARE
$app = new MiddlewareRunner();
$app->add('/contact', new ContactFormMiddleware());
$app->add('/forum', new ForumMiddleware());
$app->add('/blog', new BlogMiddleware());
$app->add('/store', new EcommerceMiddleware());
$app->run($request, $response);
$app = new MiddlewareRunner();
$app->add('/zf2', new Zf2Middleware());
$app->add('/symfony', new SymfonyMiddleware());
$app->add('/cake', new CakeMiddleware());
$app->add('/laravel', new LaravelMiddleware());
$app->run($request, $response);

8. APLICAÇÃO COM MIDDLEWARE
use ZendStratigilityMiddlewarePipe;
use ZendDiactorosServer;
require __DIR__ . '/../vendor/autoload.php';
$app = new MiddlewarePipe();
$server = Server::createServer($app, $_SERVER, $_GET, $_POST, $_COOKIE, $_FILES);
$app->pipe('/', function ($req, $res, $next) {
if (! in_array($req->getUri()->getPath(), ['/', ''], true)) {
return $next($req, $res);
}
return $res->end('Hello world!');
});
$app->pipe('/foo', function ($req, $res, $next) {
return $res->end('FOO!');
});
$server->listen();

9. ZEND EXPRESSIVE
• Microframework voltada para PSR-7 middlewares
• Recursos:
• Routing
• Container (container-interopt)
• Templating
• Error Handling
• Pipelines

10. EXPRESSIVE - EXEMPLO
<?php
use ZendExpressiveAppFactory;
chdir(dirname(__DIR__));
require 'vendor/autoload.php';
$app = AppFactory::create();
$app->get('/', function ($request, $response, $next) {
$response->getBody()->write('Hello, world!');
return $response;
});
$app->pipeRoutingMiddleware();
$app->pipeDispatchMiddleware();
$app->run();