GraphQL Configuration Options (#5782)

* add parse-graph-ql configuration for class schema customisation

Not yet tested - essentially an RFC

* refactor and add graphql router, controller and config cache

* fix(GraphQLController): add missing check isEnabled

* chore(GraphQLController): remove awaits from cache put

* chore(GraphQLController): remove check for if its enabled

* refactor(GraphQLController): only use cache if mounted

* chore(GraphQLController): group all validation errors and throw at once

* chore(GraphQLSchema): move transformations into controller validation

* refactor(GraphQL): improve ctrl validation and fix schema usage of config

* refactor(GraphQLSchema): remove code related to additional schema

This code has been moved into a separate feature branch.

* fix(GraphQLSchema): fix incorrect default return type for class configs

* refactor(GraphQLSchema): update staleness check code to account for config

* fix(GraphQLServer): fix regressed tests due to internal schema changes

This will be followed up with a backwards compatability fix for the `ClassFields` issue to avoid breakages for our users

* refactor: rename to ParseGraphQLController for consistency

* fix(ParseGraphQLCtrl): numerous fixes for validity checking

Also includes some minor code refactoring

* chore(GraphQL): minor syntax cleanup

* fix(SchemaController): add _GraphQLConfig to volatile classes

* refactor(ParseGraphQLServer): return update config value in setGraphQLConfig

* testing(ParseGraphQL): add test cases for new graphQLConfig

* fix(GraphQLController): fix issue where config with multiple items was not being mapped to the db

* fix(postgres): add _GraphQLConfig default schema on load

fixes failing postgres tests

* GraphQL @mock directive (#5836)

* Add mock directive
* Include tests for @mock directive

* Fix existing tests due to the change from ClassFields to ClassCreateFields

* fix(parseClassMutations): safer type transformation based on input type

* fix(parseClassMutations): only define necessary input fields

* fix(GraphQL): fix incorrect import paths

src/Routers/GraphQLRouter.js

@@ -0,0 +1,50 @@
+import Parse from 'parse/node';
+import PromiseRouter from '../PromiseRouter';
+import * as middleware from '../middlewares';
+
+const GraphQLConfigPath = '/graphql-config';
+
+export class GraphQLRouter extends PromiseRouter {
+  async getGraphQLConfig(req) {
+    const result = await req.config.parseGraphQLController.getGraphQLConfig();
+    return {
+      response: result,
+    };
+  }
+
+  async updateGraphQLConfig(req) {
+    if (req.auth.isReadOnly) {
+      throw new Parse.Error(
+        Parse.Error.OPERATION_FORBIDDEN,
+        "read-only masterKey isn't allowed to update the GraphQL config."
+      );
+    }
+    const data = await req.config.parseGraphQLController.updateGraphQLConfig(
+      req.body.params
+    );
+    return {
+      response: data,
+    };
+  }
+
+  mountRoutes() {
+    this.route(
+      'GET',
+      GraphQLConfigPath,
+      middleware.promiseEnforceMasterKeyAccess,
+      req => {
+        return this.getGraphQLConfig(req);
+      }
+    );
+    this.route(
+      'PUT',
+      GraphQLConfigPath,
+      middleware.promiseEnforceMasterKeyAccess,
+      req => {
+        return this.updateGraphQLConfig(req);
+      }
+    );
+  }
+}
+
+export default GraphQLRouter;