fix(GraphQL): Error if both @auth and @withSubscription are used on same type.

graphql/schema/gqlschema_test.yml

@@ -1991,6 +1991,28 @@ invalid_schemas:
      "locations":[{"line":1, "column":6}]},
     ]
 
+  - name: "@auth and @withSubscription directive on type"
+    input: |
+        type Class @withSubscription @auth(query: { rule: "{ $X_MyApp_Role: { eq: \"ADMIN\" }}"}) {
+          id: ID!
+          name: String!
+          numStudents: Int!
+        }
+
+        type School {
+          id: ID!
+          established: String!
+          name: String! @custom(http: {
+                  url: "http://mock:8888/schoolNames/$id/$established",
+                  method: "POST",
+                  body: "{sid: $id}"
+                  })
+        }
+    errlist: [
+      {"message": "Type Class; cannot have both @withSubscription and @auth directive",
+       "locations":[{"line":1, "column":6}]},
+      ]
+
   - name: "@withSubscription and @remote directive on type"
     input: |
       type Class @withSubscription @remote  {

graphql/schema/rules.go

@@ -470,6 +470,10 @@ func conflictingDirectiveValidation(schema *ast.Schema, typ *ast.Definition) gql
 		return []*gqlerror.Error{gqlerror.ErrorPosf(typ.Position, `Type %s; cannot have both @%s and @%s directive`,
 			typ.Name, SubscriptionDirective, remoteDirective)}
 	}
+	if hasSubscription && hasAuth {
+		return []*gqlerror.Error{gqlerror.ErrorPosf(typ.Position, `Type %s; cannot have both @%s and @%s directive`,
+			typ.Name, SubscriptionDirective, authDirective)}
+	}
 	return nil
 }