--- /dev/null
+<?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;
+ }
+
+}