Book Image

Spring 5.0 By Example

By : Claudio Eduardo de Oliveira
Book Image

Spring 5.0 By Example

By: Claudio Eduardo de Oliveira

Overview of this book

With growing demands, organizations are looking for systems that are robust and scalable. Therefore, the Spring Framework has become the most popular framework for Java development. It not only simplifies software development but also improves developer productivity. This book covers effective ways to develop robust applications in Java using Spring. The book has three parts, where each one covers the building of a comprehensive project in Java and Spring. In the first part, you will construct a CMS Portal using Spring's support for building REST APIs. You will also learn to integrate these APIs with AngularJS and later develop this application in a reactive fashion using Project Reactor, Spring WebFlux, and Spring Data. In the second part, you’ll understand how to build a messaging application, which will consume the Twitter API and perform filtering and transformations. Here, you will also learn about server-sent events and explore Spring’s support for Kotlin, which makes application development quick and efficient. In the last part, you will build a real microservice application using the most important techniques and patterns such as service discovery, circuit breakers, security, data streams, monitoring, and a lot more from this architectural style. By the end of the book, you will be confident about using Spring to build your applications.
Table of Contents (17 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
Index

Creating the Authentication microservice


We want to secure our microservices. Security is essential for microservices applications, especially because of the distributed characteristics.

On the microservices architectural style, usually, there is a service that will act as an authentication service. It means this service will authenticate the requests in our microservices group.

Spring Cloud Security provides a declarative model to help developers enable security on applications. There is support for commons patterns such as OAuth 2.0. Also, Spring Boot Security enables Single Sign-On (SSO).

Spring Boot Security also supports relay SSO tokens integrating with Zuul proxy. It means the tokens will be passed to downstream microservices.

For our architecture, we will use the OAuth 2.0 and JWT patterns, both integrate with Zuul proxy.

Before we do so, let's understand the main entities in OAuth 2.0 flow:

  • Protected resource: This service will apply security rules; the microservices applications, in...