CognitoDemo is a Java application, constructed with the Spring framework (Spring Boot and Spring MVC). This application shows how Amazon Web Services (AWS) Cognito can be used for server side authentication.

AWS Cognito is a multi-faceted authentication service. Cognito reduces the amount of software that has to be written to support login, account creation and user information update. Cognito is a "pay as you go" service, which does not incur the 24-hour a day, 7-days a week cost of an authentication service that is supported by a database server.

One barrier to leveraging Cognito in a Java application is the lack of documentation when it comes to writing Java code that references the Cognito API. This application includes the AuthenticationService object which contains all (most) of the functions you will need to implement server side authentication using Cognito.

This open source software was developed by Topstone Software Consulting. An article that discusses Cognito and this demonstration application can be found here.

The Cognito demonstration application is a Spring application. It consists of three major components:

• Controllers
  The Spring controllers provide the server side logic for the web pages (e.g., form input validation and processing). Most of the controllers have separate functions that process HTTP GET and POST operations.
• View
  The view contains the Java Server Pages (JSP) web pages. Each web page corresponds to a controller class.
• Services
  The services package contains the code that supports the controllers. In this demo application the core class is AuthenticationService, which implements the AuthenticationInterface. The AuthenticationService class contains the code that interfaces with Cognito.

Please see the Topstone Software article on this application for more detail.