Render category description directives

app/code/Magento/CatalogGraphQl/Model/Resolver/Categories.php

@@ -110,6 +110,7 @@ public function resolve(Field $field, $context, ResolveInfo $info, array $value
                     $categories[$item->getId()] = $this->customAttributesFlattener
                         ->flatten($categories[$item->getId()]);
                     $categories[$item->getId()]['product_count'] = $item->getProductCount();
+                    $categories[$item->getId()]['model'] = $item;
                 }
             }
 

app/code/Magento/CatalogGraphQl/Model/Resolver/Category/CategoryHtmlAttribute.php

@@ -0,0 +1,73 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\CatalogGraphQl\Model\Resolver\Category;
+
+use Magento\Catalog\Model\Category;
+use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Query\Resolver\Value;
+use Magento\Framework\GraphQl\Query\Resolver\ValueFactory;
+use Magento\Framework\GraphQl\Query\ResolverInterface;
+use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
+use Magento\Catalog\Helper\Output as OutputHelper;
+
+/**
+ * Resolve rendered content for category attributes where HTML content is allowed
+ */
+class CategoryHtmlAttribute implements ResolverInterface
+{
+    /**
+     * @var ValueFactory
+     */
+    private $valueFactory;
+
+    /**
+     * @var OutputHelper
+     */
+    private $outputHelper;
+
+    /**
+     * @param ValueFactory $valueFactory
+     * @param OutputHelper $outputHelper
+     */
+    public function __construct(
+        ValueFactory $valueFactory,
+        OutputHelper $outputHelper
+    ) {
+        $this->valueFactory = $valueFactory;
+        $this->outputHelper = $outputHelper;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function resolve(
+        Field $field,
+        $context,
+        ResolveInfo $info,
+        array $value = null,
+        array $args = null
+    ): Value {
+        if (!isset($value['model'])) {
+            $result = function () {
+                return null;
+            };
+            return $this->valueFactory->create($result);
+        }
+
+        /* @var $category Category */
+        $category = $value['model'];
+        $fieldName = $field->getName();
+        $renderedValue = $this->outputHelper->categoryAttribute($category, $category->getData($fieldName), $fieldName);
+
+        $result = function () use ($renderedValue) {
+            return $renderedValue;
+        };
+
+        return $this->valueFactory->create($result);
+    }
+}

app/code/Magento/CatalogGraphQl/Model/Resolver/Products/DataProvider/CategoryTree.php

@@ -119,6 +119,7 @@ private function processTree(\Iterator $iterator) : array
             $iterator->next();
             $nextCategory = $iterator->current();
             $tree[$category->getId()] = $this->hydrator->hydrateCategory($category);
+            $tree[$category->getId()]['model'] = $category;
             if ($nextCategory && (int) $nextCategory->getLevel() !== (int) $category->getLevel()) {
                 $tree[$category->getId()]['children'] = $this->processTree($iterator);
             }

app/code/Magento/CatalogGraphQl/etc/schema.graphqls

@@ -364,7 +364,7 @@ interface CustomizableProductInterface @typeResolver(class: "Magento\\CatalogGra
 
 interface CategoryInterface @typeResolver(class: "Magento\\CatalogGraphQl\\Model\\CategoryInterfaceTypeResolver") @doc(description: "CategoryInterface contains the full set of attributes that can be returned in a category search") {
     id: Int @doc(description: "An ID that uniquely identifies the category")
-    description: String @doc(description: "An optional description of the category")
+    description: String @doc(description: "An optional description of the category") @resolver(class: "\\Magento\\CatalogGraphQl\\Model\\Resolver\\Category\\CategoryHtmlAttribute")
     name: String @doc(description: "The display name of the category")
     path: String @doc(description: "Category Path")
     path_in_store: String @doc(description: "Category path in store")
@@ -548,6 +548,6 @@ type SortField {
 }
 
 type SortFields @doc(description: "SortFields contains a default value for sort fields and all available sort fields") {
-    default: String @doc(description: "Default value of sort fields") 
+    default: String @doc(description: "Default value of sort fields")
     options: [SortField] @doc(description: "Available sort fields")
 }

dev/tests/api-functional/testsuite/Magento/GraphQl/Catalog/CategoryWithDescriptionDirectivesTest.php

@@ -0,0 +1,65 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Catalog;
+
+use Magento\Catalog\Api\CategoryRepositoryInterface;
+use Magento\Catalog\Api\Data\CategoryInterface;
+use Magento\Store\Model\StoreManagerInterface;
+use Magento\TestFramework\ObjectManager;
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+
+/**
+ * Test for checking that category description directives are rendered correctly
+ */
+class CategoryWithDescriptionDirectivesTest extends GraphQlAbstract
+{
+    /**
+     * @var \Magento\TestFramework\ObjectManager
+     */
+    private $objectManager;
+
+    protected function setUp()
+    {
+        $this->objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Catalog/_files/category.php
+     */
+    public function testHtmlDirectivesRendered()
+    {
+        $categoryId = 333;
+        $mediaFilePath = '/path/to/mediafile';
+        /** @var StoreManagerInterface $storeManager */
+        $storeManager = ObjectManager::getInstance()->get(StoreManagerInterface::class);
+        $storeBaseUrl = $storeManager->getStore()->getBaseUrl();
+
+        /* Remove index.php from base URL */
+        $storeBaseUrlParts = explode('/index.php', $storeBaseUrl);
+        $storeBaseUrl = $storeBaseUrlParts[0];
+
+        /** @var CategoryRepositoryInterface $categoryRepository */
+        $categoryRepository = ObjectManager::getInstance()->get(CategoryRepositoryInterface::class);
+        /** @var CategoryInterface $category */
+        $category = $categoryRepository->get($categoryId);
+        $category->setDescription('Test: {{media url="' . $mediaFilePath . '"}}');
+        $categoryRepository->save($category);
+
+        $query = <<<QUERY
+{
+  category(id: {$categoryId}) {
+    description
+  }
+}
+QUERY;
+        $response = $this->graphQlQuery($query);
+
+        self::assertNotContains('media url', $response['category']['description']);
+        self::assertContains($storeBaseUrl, $response['category']['description']);
+    }
+}