Introducción a aplicaciones php basadas en middleware y psr 7

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This document introduces PHP applications based on middleware and PSR-7. It discusses the PSR-7 standard for HTTP messages, which defines request and response objects. It also covers PSR-15 for server middleware, where each middleware in the chain can process the request and decide whether to pass it to the next middleware. Examples are provided of common middleware like caching, routing, and authorization middleware. Finally, it lists some frameworks that use this middleware approach like Zend Expressive, Slim, and Stack PHP.

Software

Introducción a aplicaciones PHP
basadas en Middleware y PSR-7
Alejandro Celaya — @acelayaa

PHP Framework Interop Group
Proponen recomendaciones de estándar.
PSR-7 - HTTP Messages
PSR-15 - Server middleware
PHP-FIG

PSR-7 - HTTP Messages
El estándar HTTP de ne dos tipos de mensajes:
Request y Response
PHP está orientado hacia la web, y usa HTTP
PSR-7 propone que Request y Response sean
inmutables

Middleware
Gestión del proceso de resolución de un request a
través de capas o middlewares.
Cada middleware decide si invocar al siguiente en la
lista.

Firmas del middleware
Double-pass: Request + Response
Single pass: Request (PSR-15)
El response debería modi carse sólo en el camino de
salida.
public function __invoke(
Request $reqest,
Response $response,
callable $next
): Response;
public function process(Request $reqest, Delegate $next) : Response;

Arquitectura middleware
Imágen de Zend Expressive Docs

Cache middleware
public CacheMiddleware implements MiddlewareInterface
{
public function process(RequestInterface $request, DelegateInterface $delegate)
{
// If this route is already cached, return cached content
$cacheKey = (string) $request->getUri();
if ($this->cache->contains($cacheKey)) {
$body = new Stream('php://temp', 'rw');
$body->write($this->cache->fetch($cacheKey))
return (new Response())->withBody($body);
}
// If this route has not been cached yet, process it and cache the result
$resp = $delegate->process($request);
$this->cache->save($cacheKey, (string) $resp->getBody());
return $resp;
}
}

Routing middleware
public RoutingMiddleware implements MiddlewareInterface
{
public function process(Request $request, DelegateInterface $delegate)
{
$route = $this->router->match($request);
// If no route was found, return not found error
if ($route === null) {
return (new Response())->withStatus(404);
}
$request = $request->withAttribute('route', $route);
return $delegate->process($request);
}
}

Authorization middleware
public AuthorizationMiddleware implements MiddlewareInterface
{
public function process(Request $request, DelegateInterface $delegate)
{
$route = $request->getAttribute('route');
$resource = $route->getRouteName();
$role = $this->determineCurrentUserRole();
// If the role is allowed to access the resource, process next middleware
if ($this->acl->isAllowed($role, $resource)) {
return $delegate->process($request);
}
// If the role is not allowed to access the resource, return a forbidden response
return (new Response())->withStatus(403);
}
}

Frameworks basados en middleware
Zend Expressive (Stratigility)
Slim framework v3
Stack PHP
Relay PHP
Spiral framework
Middleman

Enlaces de interés
Expressive:
Slim:
Stack:
PHP-FIG:
PSR-7 spec:
PSR-15 spec:
PSR-7 middleware:
PSR-15 middleware:
https://docs.zendframework.com/zend-expressive/
https://www.slimframework.com/
http://stackphp.com/
http://www.php- g.org/
http://www.php- g.org/psr/psr-7/
https://github.com/php- g/ g-
standards/blob/master/proposed/http-middleware/middleware.md
https://github.com/oscarotero/psr7-middlewares
https://github.com/middlewares/awesome-psr15-
middlewares

Introducción a aplicaciones php basadas en middleware y psr 7

1. Introducción a aplicaciones PHP basadas en Middleware y PSR-7 Alejandro Celaya — @acelayaa

2. PHP Framework Interop Group Proponen recomendaciones de estándar. PSR-7 - HTTP Messages PSR-15 - Server middleware PHP-FIG

3. PSR-7 - HTTP Messages El estándar HTTP de ne dos tipos de mensajes: Request y Response PHP está orientado hacia la web, y usa HTTP PSR-7 propone que Request y Response sean inmutables

4. Middleware Gestión del proceso de resolución de un request a través de capas o middlewares. Cada middleware decide si invocar al siguiente en la lista.

5. Firmas del middleware Double-pass: Request + Response Single pass: Request (PSR-15) El response debería modi carse sólo en el camino de salida. public function __invoke( Request $reqest, Response $response, callable $next ): Response; public function process(Request $reqest, Delegate $next) : Response;

6. Arquitectura middleware Imágen de Zend Expressive Docs

7. Cache middleware public CacheMiddleware implements MiddlewareInterface { public function process(RequestInterface $request, DelegateInterface $delegate) { // If this route is already cached, return cached content $cacheKey = (string) $request->getUri(); if ($this->cache->contains($cacheKey)) { $body = new Stream('php://temp', 'rw'); $body->write($this->cache->fetch($cacheKey)) return (new Response())->withBody($body); } // If this route has not been cached yet, process it and cache the result $resp = $delegate->process($request); $this->cache->save($cacheKey, (string) $resp->getBody()); return $resp; } }

8. Routing middleware public RoutingMiddleware implements MiddlewareInterface { public function process(Request $request, DelegateInterface $delegate) { $route = $this->router->match($request); // If no route was found, return not found error if ($route === null) { return (new Response())->withStatus(404); } $request = $request->withAttribute('route', $route); return $delegate->process($request); } }

9. Authorization middleware public AuthorizationMiddleware implements MiddlewareInterface { public function process(Request $request, DelegateInterface $delegate) { $route = $request->getAttribute('route'); $resource = $route->getRouteName(); $role = $this->determineCurrentUserRole(); // If the role is allowed to access the resource, process next middleware if ($this->acl->isAllowed($role, $resource)) { return $delegate->process($request); } // If the role is not allowed to access the resource, return a forbidden response return (new Response())->withStatus(403); } }

10. Frameworks basados en middleware Zend Expressive (Stratigility) Slim framework v3 Stack PHP Relay PHP Spiral framework Middleman

11. Enlaces de interés Expressive: Slim: Stack: PHP-FIG: PSR-7 spec: PSR-15 spec: PSR-7 middleware: PSR-15 middleware: https://docs.zendframework.com/zend-expressive/ https://www.slimframework.com/ http://stackphp.com/ http://www.php- g.org/ http://www.php- g.org/psr/psr-7/ https://github.com/php- g/ g- standards/blob/master/proposed/http-middleware/middleware.md https://github.com/oscarotero/psr7-middlewares https://github.com/middlewares/awesome-psr15- middlewares

12. Conclusión

13. ¿Preguntas?

Introducción a aplicaciones php basadas en middleware y psr 7

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