GraphQL v4 support

_config/graphql.yml

@@ -1,13 +1,8 @@
 ---
 Name: linkgraphql
 ---
-SilverStripe\GraphQL\Manager:
+SilverStripe\GraphQL\Schema\Schema:
   schemas:
     admin:
-      types:
-        LinkType: SilverStripe\Link\GraphQL\LinkTypeType
-        LinkDescription: SilverStripe\Link\GraphQL\LinkDescriptionType
-
-      queries:
-        readLinkTypes: SilverStripe\Link\GraphQL\LinkTypeQuery
-        readLinkDescription: SilverStripe\Link\GraphQL\LinkDescriptionQuery
+      src:
+        link: silverstripe/link:_graphql

_graphql/queries.yml

@@ -0,0 +1,6 @@
+'readLinkDescription(dataStr: String!)':
+  type: LinkDescription
+  resolver: ['SilverStripe\Link\GraphQL\LinkDescriptionResolver', 'resolve']
+'readLinkTypes(keys: [ID])':
+  type: '[LinkType]'
+  resolver: ['SilverStripe\Link\GraphQL\LinkTypeResolver', 'resolve']

_graphql/types.yml

@@ -0,0 +1,11 @@
+LinkDescription:
+  description: Given some Link data, computes the matching description
+  fields:
+    description: String
+
+LinkType:
+  description: Describe a Type of Link that can be managed by a LinkField
+  fields:
+    key: ID
+    handlerName: String!
+    title: String!

src/GraphQL/LinkDescriptionResolver.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace SilverStripe\Link\GraphQL;
+
+use GraphQL\Type\Definition\ResolveInfo;
+use SilverStripe\GraphQL\Schema\Resolver\DefaultResolverProvider;
+use SilverStripe\Link\Type\Registry;
+
+class LinkDescriptionResolver extends DefaultResolverProvider
+{
+    public static function resolve($object, array $args, $context, ResolveInfo $info)
+    {
+        $data = json_decode($args['dataStr'], true);
+        if (json_last_error() !== JSON_ERROR_NONE) {
+            throw new \InvalidArgumentException('data must be a valid JSON string');
+        }
+
+        if (empty($data['typeKey'])) {
+            return ['description' => ''];
+        }
+
+        $type = Registry::singleton()->byKey($data['typeKey']);
+        if (empty($type)) {
+            return ['description' => ''];
+        }
+
+
+        return ['description' => $type->generateLinkDescription($data)];
+    }
+}

src/GraphQL/LinkTypeQuery.php → src/GraphQL/LinkTypeResolver.php

@@ -1,40 +1,15 @@
 <?php
+
 namespace SilverStripe\Link\GraphQL;
 
 use GraphQL\Type\Definition\ResolveInfo;
-use GraphQL\Type\Definition\Type as GraphqlType;
-use SilverStripe\GraphQL\QueryCreator;
+use SilverStripe\GraphQL\Schema\Resolver\DefaultResolverProvider;
 use SilverStripe\Link\Type\Registry;
 use SilverStripe\Link\Type\Type;
 
-/**
- * GraphQL Query to retrieve the list of possible LinkTypes.
- */
-class LinkTypeQuery extends QueryCreator
+class LinkTypeResolver extends DefaultResolverProvider
 {
-
-    public function attributes()
-    {
-        return [
-            'name' => 'readLinkTypes'
-        ];
-    }
-
-    public function type()
-    {
-        return GraphqlType::listOf($this->manager->getType('LinkType'));
-    }
-
-    public function args()
-    {
-        return [
-            'keys' => [
-                'type' => GraphqlType::listOf(GraphqlType::id()),
-            ],
-        ];
-    }
-
-    public function resolve($object, array $args, $context, ResolveInfo $info)
+    public static function resolve($object, array $args, $context, ResolveInfo $info)
     {
         if (isset($args['keys']) && !is_array($args['keys'])) {
             throw new \InvalidArgumentException('If `keys` is provdied, it must be an array');