Replaced old /api endpoint with ApiController

config/routes.php

@@ -10,3 +10,6 @@ $route->get('/credits', 'CreditsController@index');
 // Stats
 $route->get('/metrics', 'Metrics\\Controller@metrics');
 $route->get('/stats', 'Metrics\\Controller@stats');
+
+// API
+$route->get('/api[/{resource:.+}]', 'ApiController@index');

src/Controllers/ApiController.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Engelsystem\Controllers;
+
+use Engelsystem\Http\Response;
+
+class ApiController extends BaseController
+{
+    /** @var Response */
+    protected $response;
+
+    /**
+     * @param Response $response
+     */
+    public function __construct(Response $response)
+    {
+        $this->response = $response;
+    }
+
+    /**
+     * @return Response
+     */
+    public function index()
+    {
+        return $this->response
+            ->setStatusCode(501)
+            ->withHeader('content-type', 'application/json')
+            ->withContent(json_encode(['error' => 'Not implemented']));
+    }
+}

src/Middleware/LegacyMiddleware.php

@@ -17,7 +17,6 @@ class LegacyMiddleware implements MiddlewareInterface
     protected $free_pages = [
         'admin_event_config',
         'angeltypes',
-        'api',
         'atom',
         'ical',
         'login',
@@ -106,10 +105,6 @@ class LegacyMiddleware implements MiddlewareInterface
         $title = ucfirst($page);
         switch ($page) {
             /** @noinspection PhpMissingBreakStatementInspection */
-            case 'api':
-                error('Api disabled temporarily.');
-                redirect(page_link_to());
-            /** @noinspection PhpMissingBreakStatementInspection */
             case 'ical':
                 require_once realpath(__DIR__ . '/../../includes/pages/user_ical.php');
                 user_ical();

tests/Unit/Controllers/ApiControllerTest.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Controllers;
+
+use Engelsystem\Controllers\ApiController;
+use Engelsystem\Http\Response;
+use PHPUnit\Framework\TestCase;
+
+class ApiControllerTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Controllers\ApiController::__construct
+     * @covers \Engelsystem\Controllers\ApiController::index
+     */
+    public function testIndex()
+    {
+        $controller = new ApiController(new Response());
+
+        $response = $controller->index();
+
+        $this->assertEquals(501, $response->getStatusCode());
+        $this->assertEquals(['application/json'], $response->getHeader('content-type'));
+        $this->assertJson($response->getContent());
+    }
+}