Resolve #3455942 "Api render component with default props values from config"

Closes #3455942

src/Controller/SdcController.php

@@ -12,6 +12,7 @@ use Drupal\experience_builder\Plugin\DataType\ComponentTreeHydrated;
 use Drupal\experience_builder\Plugin\DataType\ComponentTreeStructure;
 use Drupal\experience_builder\Plugin\Field\FieldType\ComponentTreeItem;
 use Drupal\node\Entity\Node;
+use Drupal\user\Entity\User;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpFoundation\Request;
@@ -103,9 +104,17 @@ final class SdcController extends ControllerBase {
     assert(!empty($component_info));
     $component = array_values($component_info)[0];
     $metadata = $component->metadata;
-    $properties = $metadata->schema['properties'] ?? [];
-    foreach ($properties as $prop_name => $prop_info) {
-      self::populatePropValues($build, [], $prop_name, $prop_info);
+
+    $component_config = Component::loadByComponentMachineName($component_id);
+    assert($component_config instanceof Component);
+    foreach (array_keys($metadata->schema['properties'] ?? []) as $prop_name) {
+      $default_static_prop_source = $component_config->getDefaultStaticPropSource($prop_name);
+      if ($default_static_prop_source) {
+        $build['#props'][$prop_name] = $default_static_prop_source->evaluate(
+        // @todo Either remove the need for passing in a host entity (it's not necessary for static prop sources!), or … actually provide that context here. The latter seems preferable, to allow for context-aware components in the future. As long as we only support StaticPropSources here, this will suffice.
+          User::create([])
+        );
+      }
     }
 
     $rendered_component = $this->renderer->render($build);
@@ -215,43 +224,4 @@ HTML;
     ]);
   }
 
-  /**
-   * Assign values to props in the SDC render array.
-   *
-   * @param array<string, mixed> $build
-   *   The render array.
-   * @param array<string, mixed> $values
-   *   Already defined prop values.
-   * @param string $prop_name
-   *   The prop being checked.
-   * @param array<string, mixed> $prop_info
-   *   The prop's metadata.
-   */
-  private function populatePropValues(array &$build, array $values, string $prop_name, array $prop_info):void {
-    $value = '';
-    if (isset($prop_info['examples'])) {
-      if ($values) {
-        $value = $prop_info['examples'][$values[$prop_name]] ?? $prop_info['examples'][0];
-      }
-      else {
-        $value = $prop_info['examples'][0];
-      }
-    }
-    elseif (isset($prop_info['enum'])) {
-      $value = $prop_info['enum'][0];
-    }
-    elseif (isset($prop_info['type'][1]) && $prop_info['type'][1] === 'object') {
-      if (isset($prop_info['format']) && $prop_info['format'] === 'uri') {
-        $value = 'https://drupal.org';
-      }
-      elseif ($prop_info['type'][0] !== 'string') {
-        $value = new $prop_info['type'][0]();
-      }
-    }
-    elseif ($prop_info['type'][0] === 'object') {
-      $value = [];
-    }
-    $build['#props'][$prop_name] = $value;
-  }
-
 }