knowledge-8.x-1.x-dev/src/Plugin/Block/KnowledgeQualityBlock.php

<?php

namespace Drupal\knowledge\Plugin\Block;

use Drupal\Core\Access\AccessResult;
use Drupal\Core\Block\BlockBase;
use Drupal\Core\Cache\Cache;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Session\AccountInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Displays the Quality, either view or form.
 *
 * @Block(
 *   id = "knowledge_quality_block",
 *   admin_label = @Translation("Knowledge Quality block"),
 *   category = @Translation("Knowledge")
 * )
 */
class KnowledgeQualityBlock extends BlockBase implements ContainerFactoryPluginInterface {
  /**
   * The current route match.
   *
   * @var \Drupal\Core\Routing\RouteMatchInterface
   */
  protected $routeMatch;

  /**
   * Knowledge Quality constructor.
   *
   * @param array $configuration
   *   A configuration array containing information about the plugin instance.
   * @param string $plugin_id
   *   The plugin_id for the plugin instance.
   * @param mixed $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
   *   The current route match service.
   */
  public function __construct(
    array $configuration,
    $plugin_id,
    $plugin_definition,
    RouteMatchInterface $route_match,
  ) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->routeMatch = $route_match;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static(
      $configuration,
      $plugin_id,
      $plugin_definition,
      $container->get('current_route_match')
    );
  }

  /**
   * {@inheritdoc}
   */
  public function build() {
    $route_name = $this->routeMatch->getRouteName();

    if ($route_name != 'entity.node.canonical') {
      return NULL;
    }
    /** @var \Drupal\node\NodeInterface $node */
    $node = $this->routeMatch->getParameter('node');

    $build['knowledge_quality_form'] = [
      '#lazy_builder' => [
        'knowledge.lazy_builders:renderQualityForm',
        [
          'node',
          $node->id(),
          $node->getRevisionId(),
          $node->getOwnerId(),
        ],
      ],
      '#create_placeholder' => TRUE,
    ];
    $build['#cache']['max-age'] = 0;

    return $build;
  }

  /**
   * {@inheritdoc}
   */
  public function blockAccess(AccountInterface $account) {
    return AccessResult::allowedIfHasPermission($account, 'add quality entities');
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheTags() {
    /** @var \Drupal\node\NodeInterface $node */
    if ($node = $this->routeMatch->getParameter('node')) {
      // If there is node add its cachetag.
      return Cache::mergeTags(parent::getCacheTags(), ['node:' . $node->id()]);
    }
    else {
      // Return default tags instead.
      return parent::getCacheTags();
    }
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheContexts() {
    return Cache::mergeContexts(parent::getCacheContexts(), ['route', 'user']);
  }

}