Zend Expressive中的主机名路由

Question

Zend Expressive具有适用于Aura.Router，FastRoute和zend-mvc Router的适配器，路由可以轻松匹配方法和路径：

<?php
$app->get('/foo', $middleware);

使用zend-mvc路由器组件，可以匹配主机名：

<?php
use Zend\Mvc\Router\Http\Hostname;

$route = Hostname::factory([
    'route' => ':subdomain.example.com/foo',
    'constraints' => [
        'subdomain' => 'api',
    ],
]);

$router->addRoute('foo', $route);

Symfony Routing Component也可以做到这一点：

<?php
use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\Route;

$route = new Route(
    '/foo', // path
    array('_controller' => 'SomeController'), // default values
    array('subdomain' => 'api'), // requirements
    array(), // options
    '{subdomain}.example.com', // host
    array(), // schemes
    array() // methods
);

$routes = new RouteCollection();
$routes->add('foo', $route);

因此，我希望能够与Expressive进行类似的操作，并根据子域将请求分派到其他中间件：

// dispatch the requiest to ApiMiddleware
$app->get(':subdomain.example.com/foo', $ApiMiddleware, ['subdomain' => 'api']);

// dispatch the requiest to WebMiddleware
$app->get(':subdomain.example.com/foo', $WebMiddleware, ['subdomain' => 'www']);

提前致谢！

Answer 1

为什么不创建用于提取请求的新中间件并选择下一步应在管道中调用的中间件？

您可以这样做：

应用\\中间件\\ DeciderMiddleware

<?php

namespace Application\Middleware;

use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;

class DeciderMiddleware
{
    protected $apiMiddleware;
    protected $webMiddleware;

    public function __construct(
        callable $apiMiddleware,
        callable $webMiddleware
    ) {
        $this->apiMiddleware = $apiMiddleware;
        $this->webMiddleware = $webMiddleware;
    }

    public function __invoke(
        ServerRequestInterface $request,
        ResponseInterface $response,
        callable $next = null
    ) {
        if (strpos($request->getUri()->getHost(), 'api.') === 0) {
            return ($this->apiMiddleware)($request, $response);
        }

        if (strpos($request->getUri()->getHost(), 'www.') === 0) {
            return ($this->webMiddleware)($request, $response);
        }

        return $next($request, $response);
    }
}

配置/自动加载/中间件pipeline.global.php

<?php

return [
    'dependencies' => [
        'factories' => [
            Application\Middleware\DeciderMiddleware::class => Application\Middleware\DeciderMiddlewareFactory::class
        ],
    ],
    'middleware_pipeline' => [
        'always' => [
            'middleware' => [
                Application\Middleware\DeciderMiddleware::class
            ],
            'priority' => 10000,
        ],
    ],
];

唯一要做的就是在DeciderMiddlewareFactory中定义apiMiddleware和webMiddleware并使用这些参数初始化DeciderMiddleware-object。