Add helper for accessing the context in grahpql

src/Helpers/OauthContext.php

@@ -0,0 +1,85 @@
+<?php
+
+namespace Riddler7\Oauth2GraphQL\Helpers;
+
+use AdvancedLearning\Oauth2Server\Models\Client;
+
+trait OauthContext
+{
+    /**
+     * Name of the oauth client id in the graphql context.
+     *
+     * @var string
+     */
+    protected static $oauthClientKey = 'oauthClientIdentifier';
+
+    /**
+     * Name of the oauth scopes in the graphql context.
+     *
+     * @var string
+     */
+    protected static $oauthScopesKey = 'oauthScopes';
+
+    /**
+     * Determine if the scope has a valid client.
+     *
+     * @param array $context
+     *
+     * @return bool
+     */
+    public function hasOauthClient(array $context)
+    {
+        return !empty($context[self::$oauthClientKey]);
+    }
+
+    /**
+     * Return the model for the Oauth Client.
+     *
+     * @param array $context
+     *
+     * @return null|\SilverStripe\ORM\DataObject
+     */
+    public function getOauthClient(array $context)
+    {
+        if (!$this->hasOauthClient($context)) {
+            return null;
+        }
+
+        return Client::get()->filter(['Identifier' => $context[self::$oauthClientKey]])->first();
+    }
+
+    /**
+     * Determine whether the a scope has been granted.
+     *
+     * @param array  $context
+     * @param string $scope
+     *
+     * @return bool
+     */
+    public function hasScope(array $context, string $scope)
+    {
+        return !empty($context[self::$oauthScopesKey]) && in_array($scope, $context[self::$oauthScopesKey]);
+    }
+
+    /**
+     * Determnie whether all the scopes have been granted.
+     *
+     * @param array $context
+     * @param array $scopes
+     *
+     * @return bool
+     */
+    public function hasScopes(array $context, array $scopes)
+    {
+        $has = true;
+
+        foreach ($scopes as $scope) {
+            // stop once we get the first false result
+            if (!$this->hasScope($context, $scope)) {
+                return false;
+            }
+        }
+
+        return $has;
+    }
+}

tests/GraphqlTest.php

@@ -18,6 +18,7 @@
 use League\OAuth2\Server\Grant\ClientCredentialsGrant;
 use League\OAuth2\Server\Grant\PasswordGrant;
 use Riddler7\Oauth2GraphQL\Controller;
+use Riddler7\Oauth2GraphQL\Helpers\OauthContext;
 use Riddler7\Oauth2GraphQL\Tests\BlankMutation;
 use Riddler7\Oauth2GraphQL\Tests\BlankQuery;
 use Riddler7\Oauth2GraphQL\Tests\BlankType;
@@ -34,7 +35,7 @@
 
 class GraphqlTest extends SapphireTest
 {
-    use CryptTrait;
+    use CryptTrait, OauthContext;
 
     protected static $fixture_file = 'tests/OAuthFixture.yml';
 
@@ -176,7 +177,7 @@ public function testGraphQLContexts()
         $manager = new Manager('myschema');
 
         // extract the context
-        $manager->addMiddleware(new GraphQLSchemaExtractor(function($currentContext) use (&$context) {
+        $manager->addMiddleware(new GraphQLSchemaExtractor(function ($currentContext) use (&$context) {
             $context = $currentContext;
         }));
 
@@ -186,6 +187,38 @@ public function testGraphQLContexts()
         $this->assertEquals($client->Identifier, $context['oauthClientIdentifier']);
         $this->assertEquals(1, count($context['oauthScopes']));
         $this->assertEquals('members', $context['oauthScopes'][0]);
+
+        // test the context helper
+        $this->assertEquals(
+            true,
+            $this->hasOauthClient($context),
+            'Context should contain a client'
+        );
+        $this->assertEquals(
+            true,
+            $this->hasScope($context, 'members'),
+            'Context should have a \'members\' scope'
+        );
+        $this->assertEquals(
+            false,
+            $this->hasScope($context, 'admin'),
+            'Context should not have an \'admin\' scope'
+        );
+        $this->assertEquals(
+            true,
+            $this->hasScopes($context,
+                ['members'])
+        );
+        $this->assertEquals(
+            false,
+            $this->hasScopes($context,
+                ['admin'])
+        );
+        $this->assertEquals(
+            $client->ID,
+            $this->getOauthClient($context)->ID,
+            'The ids for the Oauth Client should match'
+        );
     }
 
     /**