Book Image

Hands-On Spring Security 5 for Reactive Applications

By : Tomcy John
Book Image

Hands-On Spring Security 5 for Reactive Applications

By: Tomcy John

Overview of this book

Spring Security enables developers to seamlessly integrate authorization, authentication, and a range of security features for complex enterprise applications. This book provides a hands-on approach to developing reactive applications using Spring and will help you get up and running in no time. Complete with step-by-step explanations, practical examples, and self-assessment questions, the book begins by explaining the essential concepts of reactive programming, Spring Framework, and Spring Security. You’ll then learn about a variety of authentication mechanisms and how to integrate them easily with a Spring MVC application. You’ll also understand how to achieve authorization in a Spring WebFlux application using Spring Security. Furthermore, the book will take you through the configuration required to implement OAuth2 for securing REST APIs, and guide you in integrating security in microservices and serverless applications. Finally, you’ll be able to augment add-ons that will enhance any Spring Security module. By the end of the book, you’ll be equipped to integrate Spring Security into your Java enterprise applications proficiently.
Table of Contents (15 chapters)
Title Page
Copyright and Credits
Packt Upsell

Custom AuthenticationEntryPoint

A custom AuthenticationEntryPoint can be used to set necessary response headers, content-type, and so on before sending the response back to the client.

The class is a built-in AuthenticationEntryPoint implementation, which will get invoked for basic authentication to commence. A custom entry point can be created by implementing the interface. The following is an example implementation:

public final class CustomAuthenticationEntryPoint implements 
        AuthenticationEntryPoint {
    public void commence(final HttpServletRequest request, final 
            HttpServletResponse response, final AuthenticationException 
        authException) throws IOException {
        response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Unauthorized");

When a client accesses resources without authentication...