ViewAjaxController.php

<?php

namespace Drupal\views\Controller;

use Drupal\Component\Utility\Html;
use Drupal\Component\Utility\UrlHelper;
use Drupal\Core\Ajax\PrependCommand;
use Drupal\Core\Ajax\ReplaceCommand;
use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\Entity\EntityStorageInterface;
use Drupal\Core\EventSubscriber\MainContentViewSubscriber;
use Drupal\Core\Form\FormBuilderInterface;
use Drupal\Core\Path\CurrentPathStack;
use Drupal\Core\Render\RendererInterface;
use Drupal\Core\Routing\RedirectDestinationInterface;
use Drupal\Core\Ajax\ScrollTopCommand;
use Drupal\views\Ajax\ViewAjaxResponse;
use Drupal\views\ViewExecutableFactory;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;

/**
 * Defines a controller to load a view via AJAX.
 */
class ViewAjaxController implements ContainerInjectionInterface {
    
    /**
     * Parameters that should be filtered and ignored inside ajax requests.
     */
    public const FILTERED_QUERY_PARAMETERS = [
        'view_name',
        'view_display_id',
        'view_args',
        'view_path',
        'view_dom_id',
        'pager_element',
        'view_base_path',
        'ajax_page_state',
        '_drupal_ajax',
        FormBuilderInterface::AJAX_FORM_REQUEST,
        MainContentViewSubscriber::WRAPPER_FORMAT,
    ];
    
    /**
     * The entity storage for views.
     *
     * @var \Drupal\Core\Entity\EntityStorageInterface
     */
    protected $storage;
    
    /**
     * The factory to load a view executable with.
     *
     * @var \Drupal\views\ViewExecutableFactory
     */
    protected $executableFactory;
    
    /**
     * The renderer.
     *
     * @var \Drupal\Core\Render\RendererInterface
     */
    protected $renderer;
    
    /**
     * The current path.
     *
     * @var \Drupal\Core\Path\CurrentPathStack
     */
    protected $currentPath;
    
    /**
     * The redirect destination.
     *
     * @var \Drupal\Core\Routing\RedirectDestinationInterface
     */
    protected $redirectDestination;
    
    /**
     * Constructs a ViewAjaxController object.
     *
     * @param \Drupal\Core\Entity\EntityStorageInterface $storage
     *   The entity storage for views.
     * @param \Drupal\views\ViewExecutableFactory $executable_factory
     *   The factory to load a view executable with.
     * @param \Drupal\Core\Render\RendererInterface $renderer
     *   The renderer.
     * @param \Drupal\Core\Path\CurrentPathStack $current_path
     *   The current path.
     * @param \Drupal\Core\Routing\RedirectDestinationInterface $redirect_destination
     *   The redirect destination.
     */
    public function __construct(EntityStorageInterface $storage, ViewExecutableFactory $executable_factory, RendererInterface $renderer, CurrentPathStack $current_path, RedirectDestinationInterface $redirect_destination) {
        $this->storage = $storage;
        $this->executableFactory = $executable_factory;
        $this->renderer = $renderer;
        $this->currentPath = $current_path;
        $this->redirectDestination = $redirect_destination;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('entity_type.manager')
            ->getStorage('view'), $container->get('views.executable'), $container->get('renderer'), $container->get('path.current'), $container->get('redirect.destination'));
    }
    
    /**
     * Loads and renders a view via AJAX.
     *
     * @param \Symfony\Component\HttpFoundation\Request $request
     *   The current request object.
     *
     * @return \Drupal\views\Ajax\ViewAjaxResponse
     *   The view response as ajax response.
     *
     * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
     *   Thrown when the view was not found.
     */
    public function ajaxView(Request $request) {
        $name = $request->get('view_name');
        $display_id = $request->get('view_display_id');
        if (isset($name) && isset($display_id)) {
            $args = $request->get('view_args', '');
            $args = $args !== '' ? explode('/', Html::decodeEntities($args)) : [];
            // Arguments can be empty, make sure they are passed on as NULL so that
            // argument validation is not triggered.
            $args = array_map(function ($arg) {
                return $arg == '' ? NULL : $arg;
            }, $args);
            $path = $request->get('view_path');
            $dom_id = $request->get('view_dom_id');
            $dom_id = isset($dom_id) ? preg_replace('/[^a-zA-Z0-9_-]+/', '-', $dom_id) : NULL;
            $pager_element = $request->get('pager_element');
            $pager_element = isset($pager_element) ? intval($pager_element) : NULL;
            $response = new ViewAjaxResponse();
            // Remove all of this stuff from the query of the request so it doesn't
            // end up in pagers and tablesort URLs. Additionally we need to preserve
            // ajax_page_state and add it back after the request has been processed so
            // the related listener can behave correctly.
            // @todo Remove this parsing once these are removed from the request in
            //   https://www.drupal.org/node/2504709.
            $existing_page_state = $request->get('ajax_page_state');
            foreach (self::FILTERED_QUERY_PARAMETERS as $key) {
                $request->query
                    ->remove($key);
                $request->request
                    ->remove($key);
            }
            // Load the view.
            if (!($entity = $this->storage
                ->load($name))) {
                throw new NotFoundHttpException();
            }
            $view = $this->executableFactory
                ->get($entity);
            if ($view && $view->access($display_id) && $view->setDisplay($display_id) && $view->display_handler
                ->ajaxEnabled()) {
                $response->setView($view);
                // Fix the current path for paging.
                if (!empty($path)) {
                    $this->currentPath
                        ->setPath('/' . ltrim($path, '/'), $request);
                }
                // Create a clone of the request object to avoid mutating the request
                // object stored in the request stack.
                $request_clone = clone $request;
                // Add all POST data, because AJAX is sometimes a POST and many things,
                // such as tablesorts, exposed filters and paging assume GET.
                $param_union = $request_clone->request
                    ->all() + $request_clone->query
                    ->all();
                $request_clone->query
                    ->replace($param_union);
                // Overwrite the destination.
                // @see the redirect.destination service.
                $origin_destination = $request_clone->getBasePath() . '/' . ltrim($path ?? '/', '/');
                $used_query_parameters = $request_clone->query
                    ->all();
                $query = UrlHelper::buildQuery($used_query_parameters);
                if ($query != '') {
                    $origin_destination .= '?' . $query;
                }
                $this->redirectDestination
                    ->set($origin_destination);
                // Override the display's pager_element with the one actually used.
                if (isset($pager_element)) {
                    $response->addCommand(new ScrollTopCommand(".js-view-dom-id-{$dom_id}"));
                    $view->displayHandlers
                        ->get($display_id)
                        ->setOption('pager_element', $pager_element);
                }
                // Reuse the same DOM id so it matches that in drupalSettings.
                $view->dom_id = $dom_id;
                // Populate request attributes temporarily with ajax_page_state theme
                // and theme_token for theme negotiation.
                $theme_keys = [
                    'theme' => TRUE,
                    'theme_token' => TRUE,
                ];
                if (is_array($existing_page_state) && ($temp_attributes = array_intersect_key($existing_page_state, $theme_keys))) {
                    $request->attributes
                        ->set('ajax_page_state', $temp_attributes);
                }
                $preview = $view->preview($display_id, $args);
                $request->attributes
                    ->remove('ajax_page_state');
                $response->addCommand(new ReplaceCommand(".js-view-dom-id-{$dom_id}", $preview));
                $response->addCommand(new PrependCommand(".js-view-dom-id-{$dom_id}", [
                    '#type' => 'status_messages',
                ]));
                $request->query
                    ->set('ajax_page_state', $existing_page_state);
                if (!empty($preview['#attached'])) {
                    $response->setAttachments($preview['#attached']);
                }
                return $response;
            }
            else {
                throw new AccessDeniedHttpException();
            }
        }
        else {
            throw new NotFoundHttpException();
        }
    }

}