Create HomeController.php

src/Controller/HomeController.php

@@ -0,0 +1,29 @@
+<?php
+/**
+ * @file
+ * Contains \Drupal\islandora\Controller\HomeController.
+ */
+
+namespace Drupal\islandora\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Views\ViewExecutable;
+use Drupal\views\Views;
+
+class HomeController extends ControllerBase {
+  public function welcome() {
+    $frontPage = \Drupal::configFactory()->get('system.site')->get('page.front');
+    $original_template = \Drupal::service('file_system')->realpath(\Drupal::service('module_handler')->getModule('islandora')->getPath());
+    $theme_templates = DRUPAL_ROOT . '/' . drupal_get_path('theme', \Drupal::config('system.theme')->get('default')) . '/templates';
+    if (! file_exists($theme_templates . '/welcome.html.twig')) {
+        copy( $original_template . '/templates/welcome.html.twig', $theme_templates . '/welcome.html.twig');
+        copy( $original_template . '/templates/welcome_base.html.twig', $theme_templates . '/welcome_base.html.twig');
+    }
+    if ($frontPage != '/welcome') {
+        \Drupal::configFactory()->getEditable('system.site')->set('page.front', '/welcome')->save();
+    }
+    return [
+        '#theme' => 'welcome'
+      ];
+  }
+}