feat: Add request context middleware for config and dependency injection in hooks (#8480)

spec/rest.spec.js

@@ -1139,3 +1139,25 @@ describe('read-only masterKey', () => {
       });
   });
 });
+
+describe('rest context', () => {
+  it('should support dependency injection on rest api', async () => {
+    const requestContextMiddleware = (req, res, next) => {
+      req.config.aCustomController = 'aCustomController';
+      next();
+    };
+
+    let called
+    await reconfigureServer({ requestContextMiddleware });
+    Parse.Cloud.beforeSave('_User', request => {
+      expect(request.config.aCustomController).toEqual('aCustomController');
+      called = true;
+    });
+    const user = new Parse.User();
+    user.setUsername('test');
+    user.setPassword('test');
+    await user.signUp();
+
+    expect(called).toBe(true);
+  });
+});