Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\node\ContextProvider;
Chris@0: 
Chris@0: use Drupal\Core\Cache\CacheableMetadata;
Chris@0: use Drupal\Core\Plugin\Context\Context;
Chris@0: use Drupal\Core\Plugin\Context\ContextProviderInterface;
Chris@17: use Drupal\Core\Plugin\Context\EntityContext;
Chris@17: use Drupal\Core\Plugin\Context\EntityContextDefinition;
Chris@0: use Drupal\Core\Routing\RouteMatchInterface;
Chris@0: use Drupal\node\Entity\Node;
Chris@0: use Drupal\Core\StringTranslation\StringTranslationTrait;
Chris@0: 
Chris@0: /**
Chris@0:  * Sets the current node as a context on node routes.
Chris@0:  */
Chris@0: class NodeRouteContext implements ContextProviderInterface {
Chris@0: 
Chris@0:   use StringTranslationTrait;
Chris@0: 
Chris@0:   /**
Chris@0:    * The route match object.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Routing\RouteMatchInterface
Chris@0:    */
Chris@0:   protected $routeMatch;
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs a new NodeRouteContext.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
Chris@0:    *   The route match object.
Chris@0:    */
Chris@0:   public function __construct(RouteMatchInterface $route_match) {
Chris@0:     $this->routeMatch = $route_match;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function getRuntimeContexts(array $unqualified_context_ids) {
Chris@0:     $result = [];
Chris@17:     $context_definition = EntityContextDefinition::create('node')->setRequired(FALSE);
Chris@0:     $value = NULL;
Chris@0:     if (($route_object = $this->routeMatch->getRouteObject()) && ($route_contexts = $route_object->getOption('parameters')) && isset($route_contexts['node'])) {
Chris@0:       if ($node = $this->routeMatch->getParameter('node')) {
Chris@0:         $value = $node;
Chris@0:       }
Chris@0:     }
Chris@0:     elseif ($this->routeMatch->getRouteName() == 'node.add') {
Chris@0:       $node_type = $this->routeMatch->getParameter('node_type');
Chris@0:       $value = Node::create(['type' => $node_type->id()]);
Chris@0:     }
Chris@0: 
Chris@0:     $cacheability = new CacheableMetadata();
Chris@0:     $cacheability->setCacheContexts(['route']);
Chris@0: 
Chris@0:     $context = new Context($context_definition, $value);
Chris@0:     $context->addCacheableDependency($cacheability);
Chris@0:     $result['node'] = $context;
Chris@0: 
Chris@0:     return $result;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function getAvailableContexts() {
Chris@17:     $context = EntityContext::fromEntityTypeId('node', $this->t('Node from URL'));
Chris@0:     return ['node' => $context];
Chris@0:   }
Chris@0: 
Chris@0: }