--- /dev/null
+<?php
+
+namespace Drupal\entity_browser\Controllers;
+
+use Drupal\Component\Utility\Xss;
+use Drupal\Core\Controller\ControllerResolverInterface;
+use Drupal\Core\Controller\HtmlFormController;
+use Drupal\Core\DependencyInjection\ClassResolverInterface;
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Form\FormBuilderInterface;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Standalone entity browser page.
+ */
+class EntityBrowserFormController extends HtmlFormController implements ContainerInjectionInterface {
+
+ /**
+ * Current route match service.
+ *
+ * @var \Drupal\Core\Routing\RouteMatchInterface
+ */
+ protected $currentRouteMatch;
+
+ /**
+ * The browser storage.
+ *
+ * @var \Drupal\Core\Entity\EntityStorageInterface
+ */
+ protected $browserStorage;
+
+ /**
+ * Current request.
+ *
+ * @var \Symfony\Component\HttpFoundation\Request
+ */
+ protected $request;
+
+ /**
+ * Constructs Entity browser form controller.
+ *
+ * @param \Drupal\Core\Controller\ControllerResolverInterface $controller_resolver
+ * The controller resolver.
+ * @param \Drupal\Core\Form\FormBuilderInterface $form_builder
+ * The form builder.
+ * @param \Drupal\Core\DependencyInjection\ClassResolverInterface $class_resolver
+ * The class resolver.
+ * @param RouteMatchInterface $route_match
+ * Current route match service.
+ * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+ * Entity type manager service.
+ * @param \Symfony\Component\HttpFoundation\Request $request
+ * Current request.
+ */
+ public function __construct(ControllerResolverInterface $controller_resolver, FormBuilderInterface $form_builder, ClassResolverInterface $class_resolver, RouteMatchInterface $route_match, EntityTypeManagerInterface $entity_type_manager, Request $request) {
+ parent::__construct($controller_resolver, $form_builder, $class_resolver);
+ $this->currentRouteMatch = $route_match;
+ $this->browserStorage = $entity_type_manager->getStorage('entity_browser');
+ $this->request = $request;
+ $this->formBuilder = $form_builder;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static(
+ $container->get('controller_resolver'),
+ $container->get('form_builder'),
+ $container->get('class_resolver'),
+ $container->get('current_route_match'),
+ $container->get('entity.manager'),
+ $container->get('request_stack')->getCurrentRequest()
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function getFormObject(RouteMatchInterface $route_match, $form_arg) {
+ $browser = $this->loadBrowser();
+ if ($original_path = $this->request->get('original_path')) {
+ $browser->addAdditionalWidgetParameters(['path_parts' => explode('/', $original_path)]);
+ }
+
+ return $browser->getFormObject();
+ }
+
+ /**
+ * Standalone entity browser title callback.
+ */
+ public function title() {
+ $browser = $this->loadBrowser();
+ return Xss::filter($browser->label());
+ }
+
+ /**
+ * Loads entity browser object for this page.
+ *
+ * @return \Drupal\entity_browser\EntityBrowserInterface
+ * Loads the entity browser object
+ */
+ protected function loadBrowser() {
+ /** @var $route \Symfony\Component\Routing\Route */
+ $route = $this->currentRouteMatch->getRouteObject();
+ /** @var $browser \Drupal\entity_browser\EntityBrowserInterface */
+ return $this->browserStorage->load($route->getDefault('entity_browser_id'));
+ }
+
+}