Enable cache for Format I Entity

src/App/ConfigProvider.php

@@ -36,6 +36,7 @@ public function getDependencies(): array
             ],
             'factories'  => [
                 Handler\FormatI\CandidateHandler::class => Handler\FormatI\CandidateHandlerFactory::class,
+                Handler\FormatI\EntityHandler::class => Handler\FormatI\EntityHandlerFactory::class,
             ],
         ];
     }

src/App/Handler/FormatI/EntityHandler.php

@@ -1,6 +1,6 @@
 <?php
 
-declare(strict_types=1);
+declare (strict_types = 1);
 
 namespace App\Handler\FormatI;
 
@@ -9,11 +9,36 @@
 use Psr\Http\Message\ServerRequestInterface;
 use Psr\Http\Server\RequestHandlerInterface;
 use Zend\Diactoros\Response\JsonResponse;
+use Zend\Expressive\Router\RouteResult;
+use App\Cache;
 
 class EntityHandler implements RequestHandlerInterface
 {
+    private $cache;
+    private $headers = [
+        'Cache-Control' => 'max-age=86400, public',
+    ];
+
+    public function __construct(bool $cache)
+    {
+        $this->cache = $cache;
+    }
+
     public function handle(ServerRequestInterface $request): ResponseInterface
     {
+        $routeResult = $request->getAttribute(RouteResult::class);
+
+        if ($this->cache === true) {
+            $path = Cache::path($routeResult->getMatchedRouteName(), $routeResult->getMatchedParams());
+            $cache = new Cache($path);
+
+            $json = $cache->get();
+
+            if (!is_null($json)) {
+                return new JsonResponse($json, 200, $this->headers);
+            }
+        }
+
         $year = $request->getAttribute('year');
         $type = $request->getAttribute('type');
 
@@ -22,8 +47,10 @@ public function handle(ServerRequestInterface $request): ResponseInterface
 
         $entity = new Entity(intval($year), $type, $test);
 
-        return new JsonResponse($entity->getArray(), 200, [
-            'Cache-Control' => 'max-age=86400, public',
-        ]);
+        if ($this->cache === true && isset($cache)) {
+            $cache->set($entity->getArray());
+        }
+
+        return new JsonResponse($entity->getArray(), 200, $this->headers);
     }
 }

src/App/Handler/FormatI/EntityHandlerFactory.php

@@ -0,0 +1,21 @@
+<?php
+
+declare (strict_types = 1);
+
+namespace App\Handler\FormatI;
+
+use App\Cache;
+use Psr\Container\ContainerInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+
+class EntityHandlerFactory
+{
+    public function __invoke(ContainerInterface $container): RequestHandlerInterface
+    {
+        $config = $container->get('config');
+
+        $cache = $config[Cache::ENABLE_CACHE] ?? false;
+
+        return new EntityHandler($cache);
+    }
+}