Added the ability to create a new server

src/routes.php

@@ -13,3 +13,38 @@ $app->get('/', function (Request $request, Response $response, $args) {
     'server_dir' => $config->get('server_directory'),
   ]);
 })->setName('index');
+
+// create GET route - this page allows a user to create a new server instance
+$app->get('/create', function (Request $request, Response $response, $args) {
+  $view = Twig::fromRequest($request);
+  return $view->render($response, 'create.twig');
+})->setName('create');
+
+// create POST route - processes the new server creation
+$app->post('/create', function (Request $request, Response $response, $args) {
+  // set up the POST parameters and grab our config
+  $params = (array)$request->getParsedBody();
+  $config = $this->get('config');
+
+  // create our server directory
+  $serverDir = join('/', array($config->get('server_directory'), $params['serverName']));
+  mkdir($serverDir);
+
+  // grab the server JAR file
+  $serverJarUrl = "https://piston-data.mojang.com/v1/objects/f69c284232d7c7580bd89a5a4931c3581eae1378/server.jar";
+  $serverJarName = "server_" . $params['serverVersion'] . ".jar";
+  $serverJarPath = join('/', array($serverDir, $serverJarName));
+  file_put_contents($serverJarPath, file_get_contents($serverJarUrl));
+
+  // create the start.sh shell script
+  $scriptFilePath = join('/', array($serverDir, 'start.sh'));
+  $scriptFile = fopen($scriptFilePath, 'w');
+  $scriptContent = "#!/bin/sh\n\ncd " . $serverDir . "\njava -Xmx2048M -Xms2048M -jar server_1.19.2.jar nogui";
+  fwrite($scriptFile, $scriptContent);
+  fclose($scriptFile);
+  chmod($scriptFilePath, 0755);
+
+  return $response
+    ->withHeader('Location', '/')
+    ->withStatus(302);
+});