PathProcessorEntityResourceBC.php

<?php

namespace Drupal\rest\PathProcessor;

use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\PathProcessor\InboundPathProcessorInterface;
use Symfony\Component\HttpFoundation\Request;

/**
 * Path processor to maintain BC for entity REST resource URLs from Drupal 8.0.
 */
class PathProcessorEntityResourceBC implements InboundPathProcessorInterface {
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * Creates a new PathProcessorEntityResourceBC instance.
     *
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     */
    public function __construct(EntityTypeManagerInterface $entity_type_manager) {
        $this->entityTypeManager = $entity_type_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    public function processInbound($path, Request $request) {
        if ($request->getMethod() === 'POST' && strpos($path, '/entity/') === 0) {
            $parts = explode('/', $path);
            $entity_type_id = array_pop($parts);
            // Until Drupal 8.3, no entity types specified a link template for the
            // 'create' link relation type. As of Drupal 8.3, all core content entity
            // types provide this link relation type. This inbound path processor
            // provides automatic backwards compatibility: it allows both the old
            // default from \Drupal\rest\Plugin\rest\resource\EntityResource, i.e.
            // "/entity/{entity_type}" and the link template specified in a particular
            // entity type. The former is rewritten to the latter
            // specific one if it exists.
            $entity_type = $this->entityTypeManager
                ->getDefinition($entity_type_id);
            if ($entity_type->hasLinkTemplate('create')) {
                return $entity_type->getLinkTemplate('create');
            }
        }
        return $path;
    }

}