Issue #3390505: Error: uri is not a valid type for a JSON document

Closes #3390505

src/Normalizer/DataDefinitionUriNormalizer.php

+<?php
+
+namespace Drupal\jsonapi_schema\Normalizer;
+
+use Drupal\Core\TypedData\DataDefinitionInterface;
+
+/**
+ * Data definition normalizer.
+ */
+class DataDefinitionUriNormalizer extends DataDefinitionNormalizer {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $supportedDataTypes = ['uri'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function extractPropertyData(DataDefinitionInterface $property, array $context = []) {
+    $value = parent::extractPropertyData($property);
+    $value['type'] = 'string';
+    $value['format'] = 'uri';
+    return $value;
+  }
+
+}