Add UrlHelper

The helper can be used to generate URLs from named routes.
HomeAction was converted to a service
to inject the URL helper using a factory.

Also see: [Container PSR and the Service Locator](https://github.com/php-fig/fig-standards/blob/master/proposed/container-meta.md#4-recommended-usage-container-psr-and-the-service-locator)

composer.json

@@ -7,6 +7,7 @@
     "require": {
         "xtreamwayz/pimple-container-interop": "^1.0",
         "zendframework/zend-expressive": "^1.0",
-        "zendframework/zend-expressive-fastroute": "^1.2"
+        "zendframework/zend-expressive-fastroute": "^1.2",
+        "zendframework/zend-expressive-helpers": "^2.1"
     }
 }

config/autoload/full.global.php

@@ -1,13 +0,0 @@
-<?php return [
-	'middleware_pipeline' => [
-		Zend\Expressive\Container\ApplicationFactory::ROUTING_MIDDLEWARE,
-		Zend\Expressive\Container\ApplicationFactory::DISPATCH_MIDDLEWARE,
-	],
-	'routes' => [
-		[
-			'path' => '/',
-			'middleware' => new Test\App\HomeAction,
-			'allowed_methods' => [ 'GET' ],
-		],
-	],
-];

config/config.php

@@ -0,0 +1,21 @@
+<?php return new ArrayObject([
+	'middleware_pipeline' => [
+		Zend\Expressive\Container\ApplicationFactory::ROUTING_MIDDLEWARE,
+		['middleware' => Zend\Expressive\Helper\UrlHelperMiddleware::class],
+		Zend\Expressive\Container\ApplicationFactory::DISPATCH_MIDDLEWARE,
+	],
+	'routes' => [
+		[
+			'path' => '/',
+			'middleware' => Test\App\HomeAction::class,
+			'allowed_methods' => [ 'GET' ],
+			'name' => 'home',
+		],
+		[
+			'path' => '/test/another/path',
+			'middleware' => Test\App\HomeAction::class,
+			'allowed_methods' => [ 'GET' ],
+			'name' => 'other',
+		],
+	],
+]);

config/container.php

@@ -0,0 +1,25 @@
+<?php
+
+use Test\App\HomeAction;
+use Test\App\HomeFactory;
+use Xtreamwayz\Pimple\Container;
+use Zend\Expressive\Application;
+use Zend\Expressive\Container\ApplicationFactory;
+use Zend\Expressive\Helper\UrlHelper;
+use Zend\Expressive\Helper\UrlHelperFactory;
+use Zend\Expressive\Helper\UrlHelperMiddleware;
+use Zend\Expressive\Helper\UrlHelperMiddlewareFactory;
+use Zend\Expressive\Router\FastRouteRouter;
+use Zend\Expressive\Router\RouterInterface;
+
+$c = new Container;
+
+$c['config'] = require 'config/config.php';
+
+$c[RouterInterface::class] = function () { return new FastRouteRouter; };
+$c[UrlHelper::class] = new UrlHelperFactory;
+$c[UrlHelperMiddleware::class] = new UrlHelperMiddlewareFactory;
+$c[HomeAction::class] = new HomeFactory;
+$c[Application::class] = new ApplicationFactory;
+
+return $c;

public/index.php

@@ -1,18 +1,12 @@
 <?php
 
-use Xtreamwayz\Pimple\Container;
 use Zend\Expressive\Application;
-use Zend\Expressive\Container\ApplicationFactory;
 
 chdir(dirname(__DIR__));
 require_once 'vendor/autoload.php';
 
-$c = new Container;
+$c = require 'config/container.php';
 
-$c['config'] = new ArrayObject(require 'config/autoload/full.global.php');
+$app = $c->get(Application::class);
-
-$c[Application::class] = new ApplicationFactory;
-
-$app = $c[Application::class];
 
 $app->run();

src/App/HomeAction.php

@@ -4,11 +4,20 @@ namespace Test\App;
 
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
+use Zend\Expressive\Helper\UrlHelper;
 
 class HomeAction
 {
+	private $urlhelper;
+
+	public function __construct(UrlHelper $urlhelper)
+	{
+		$this->urlhelper = $urlhelper;
+	}
+
 	public function __invoke(Request $req, Response $res, callable $next)
 	{
-		$res->getBody()->write("Hello World!");
+		$result = sprintf("Hello World!<br/>\n%s", var_export($this->urlhelper->generate('other'), true));
+		$res->getBody()->write($result);
 	}
 }

src/App/HomeFactory.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Test\App;
+
+use Interop\Container\ContainerInterface;
+use Zend\Expressive\Helper\UrlHelper;
+
+class HomeFactory
+{
+	public function __invoke(ContainerInterface $c)
+	{
+		try {
+			$urlhelper = $c->get(UrlHelper::class);
+		} catch (\Exception $e) {
+			trigger_error("Ex: $e");
+		}
+		return new HomeAction($urlhelper);
+	}
+}