Using Aura router with Aura dispatcher

Question

Is there any sample/tutorial working with both Aura router and dispatcher? I found a sample code on the documentation page:

// dispatch the request to the route handler.
// (consider using https://github.com/auraphp/Aura.Dispatcher
// in place of the one callable below.)
$callable = $route->handler;
$response = $callable($request);

// emit the response
foreach ($response->getHeaders() as $name => $values) {
    foreach ($values as $value) {
        header(sprintf('%s: %s', $name, $value), false);
    }
}
http_response_code($response->getStatusCode());
echo $response->getBody();

and I wanna know how can I integrate the Aura dispatcher with this sample code.

The second question is when we want to retrieve a GET request using Aura router, we use something like this:

// add a route to the map, and a handler for it
$map->get('blog.read', '/blog/{id}', function ($request) {
    $id = (int) $request->getAttribute('id');
    $response = new Zend\Diactoros\Response();
    $response->getBody()->write("You asked for blog entry {$id}.");
    return $response;
});

How about the POST method? I tried the following code, but it cannot retrieve the firstname in a similar way:

$map->post('profile', '/profile', function ($request) {
    $firstname = $request->getAttribute('firstname');

    $response = new Zend\Diactoros\Response();
    $response->getBody()->write("first name is {$firstname}");
    return $response;
});

The output is missing the $firstname value:

first name is 

Answer 1

There are multiple ways you can use Aura.Dispatcher. The example provided below is one way.

$route = $matcher->match($request);

So once you match the request, there can be a route or null.

If there is a route, you can get the $route->handler;. This can be either a callable or string.

It is your implementation that tells how the Dispatcher can be invoked. From https://gist.github.com/harikt/8671136

    <?php
require dirname(__DIR__) . '/vendor/autoload.php';

use Aura\Dispatcher\Dispatcher;
use Aura\Router\RouterContainer;
use Zend\Diactoros\Response;
use Zend\Diactoros\ServerRequest;

class Blog
{   
    public function browse(ServerRequest $request)
    {
        $response = new Response();
        $response->getBody()->write("Browse all posts!");

        return $response;
    }

    public function read(ServerRequest $request, $id)
    {
        $id = (int) $request->getAttribute('id');
        $response = new Response();
        $response->getBody()->write("Read blog entry $id");

        return $response;
    }

    public function edit(ServerRequest $request, $id)
    {
        $response = new Response();
        $response->getBody()->write("Edit blog entry $id");

        return $response;
    }
}

$dispatcher = new Dispatcher;
$dispatcher->setObjectParam('controller');
$dispatcher->setMethodParam('action');
$dispatcher->setObject('blog', new Blog());

$routerContainer = new RouterContainer();
$map = $routerContainer->getMap();

// NB : You can use @ sign as in Laravel. So blog@browse
$map->get('blog.browse', '/blog', 'blog::browse');
$map->get('blog.read', '/blog/{id}', 'blog::read');

$request = Zend\Diactoros\ServerRequestFactory::fromGlobals(
    $_SERVER,
    $_GET,
    $_POST,
    $_COOKIE,
    $_FILES
);
$matcher = $routerContainer->getMatcher();
$route = $matcher->match($request);

if ($route) {
    foreach ($route->attributes as $key => $val) {
        $request = $request->withAttribute($key, $val);
    }
    // Take special attention, how I am using the handler.
    // Do what you want with the handler
    list($controller, $action) = explode('::', $route->handler);

    $params = [
        'controller' => $controller,
        'action' => $action,
        'request' => $request,
        // This is not needed, just showing for demo purpose
        'id' => $request->getAttribute('id'),
    ];

    $response = $dispatcher($params);

    // emit the response
    foreach ($response->getHeaders() as $name => $values) {
        foreach ($values as $value) {
            header(sprintf('%s: %s', $name, $value), false);
        }
    }
    http_response_code($response->getStatusCode());
    echo $response->getBody();
} else {
    echo "No route found";
}

I repeat this is not the only way. There are other better ways, read https://github.com/auraphp/Aura.Web_Kernel if you are really interested to learn more.

Regarding your question about getting value from POST. No there is no other way. The router is not handling the POST values. I think probably PSR-7 could have improved a bit in those areas :-) .