Add single_snippet_selection content type resolver

Content/ContentTypeResolver/SingleSnippetSelectionResolver.php

@@ -0,0 +1,115 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of Sulu.
+ *
+ * (c) Sulu GmbH
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace Sulu\Bundle\HeadlessBundle\Content\ContentTypeResolver;
+
+use Sulu\Bundle\HeadlessBundle\Content\ContentView;
+use Sulu\Bundle\HeadlessBundle\Content\StructureResolverInterface;
+use Sulu\Bundle\SnippetBundle\Document\SnippetDocument;
+use Sulu\Bundle\SnippetBundle\Snippet\DefaultSnippetManagerInterface;
+use Sulu\Bundle\SnippetBundle\Snippet\WrongSnippetTypeException;
+use Sulu\Component\Content\Compat\PropertyInterface;
+use Sulu\Component\Content\Compat\Structure\SnippetBridge;
+use Sulu\Component\Content\Compat\Structure\StructureBridge;
+use Sulu\Component\Content\Mapper\ContentMapperInterface;
+
+class SingleSnippetSelectionResolver implements ContentTypeResolverInterface
+{
+    /**
+     * @var StructureResolverInterface
+     */
+    private $structureResolver;
+
+    /**
+     * @var ContentMapperInterface
+     */
+    private $contentMapper;
+
+    /**
+     * @var DefaultSnippetManagerInterface
+     */
+    private $defaultSnippetManager;
+
+    public function __construct(
+        ContentMapperInterface $contentMapper,
+        StructureResolverInterface $structureResolver,
+        DefaultSnippetManagerInterface $defaultSnippetManager
+    ) {
+        $this->contentMapper = $contentMapper;
+        $this->structureResolver = $structureResolver;
+        $this->defaultSnippetManager = $defaultSnippetManager;
+    }
+
+    public static function getContentType(): string
+    {
+        return 'single_snippet_selection';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function resolve($data, PropertyInterface $property, string $locale, array $attributes = []): ContentView
+    {
+        /** @var StructureBridge $structure */
+        $structure = $property->getStructure();
+        $webspaceKey = $structure->getWebspaceKey();
+        $shadowLocale = $structure->getIsShadow() ? $structure->getShadowBaseLanguage() : null;
+
+        $params = $property->getParams();
+        /** @var bool $loadExcerpt */
+        $loadExcerpt = isset($params['loadExcerpt']) ? $params['loadExcerpt']->getValue() : false;
+        /** @var string $defaultArea */
+        $defaultArea = isset($params['default']) ? $params['default']->getValue() : null;
+
+        $snippetId = $data ?? null;
+        if (empty($snippetId) && $defaultArea) {
+            $defaultSnippetId = $this->getDefaultSnippetId($webspaceKey, $defaultArea, $locale);
+            $snippetId = $defaultSnippetId ?: null;
+        }
+
+        if (null === $snippetId) {
+            return new ContentView(null);
+        }
+
+        /** @var SnippetBridge $snippet */
+        $snippet = $this->contentMapper->load($snippetId, $webspaceKey, $locale);
+
+        if (!$snippet->getHasTranslation() && null !== $shadowLocale) {
+            /** @var SnippetBridge $snippet */
+            $snippet = $this->contentMapper->load($snippetId, $webspaceKey, $shadowLocale);
+        }
+
+        $snippet->setIsShadow(null !== $shadowLocale);
+        $snippet->setShadowBaseLanguage($shadowLocale);
+
+        $resolvedSnippet = $this->structureResolver->resolve($snippet, $locale, $loadExcerpt);
+
+        return new ContentView($resolvedSnippet, ['id' => $data]);
+    }
+
+    private function getDefaultSnippetId(string $webspaceKey, string $snippetArea, string $locale): ?string
+    {
+        try {
+            /** @var SnippetDocument|null $snippet */
+            $snippet = $this->defaultSnippetManager->load($webspaceKey, $snippetArea, $locale);
+        } catch (WrongSnippetTypeException $exception) {
+            return null;
+        }
+
+        if (!$snippet) {
+            return null;
+        }
+
+        return $snippet->getUuid();
+    }
+}

Resources/config/content-type-resolvers.xml

@@ -157,5 +157,17 @@
 
             <tag name="sulu_headless.content_type_resolver"/>
         </service>
+
+        <service
+                id="sulu_headless.content_resolver.single_snippet_selection"
+                class="Sulu\Bundle\HeadlessBundle\Content\ContentTypeResolver\SingleSnippetSelectionResolver"
+                lazy="true"
+        >
+            <argument type="service" id="sulu.content.mapper"/>
+            <argument type="service" id="sulu_headless.structure_resolver"/>
+            <argument type="service" id="sulu_snippet.default_snippet.manager"/>
+
+            <tag name="sulu_headless.content_type_resolver"/>
+        </service>
     </services>
 </container>