Book Image

OAuth 2.0 Cookbook

By : Adolfo Eloy Nascimento
Book Image

OAuth 2.0 Cookbook

By: Adolfo Eloy Nascimento

Overview of this book

OAuth 2.0 is a standard protocol for authorization and focuses on client development simplicity while providing specific authorization flows for web applications, desktop applications, mobile phones, and so on. This book also provides useful recipes for solving real-life problems using Spring Security and creating Android applications. The book starts by presenting you how to interact with some public OAuth 2.0 protected APIs such as Facebook, LinkedIn and Google. You will also be able to implement your own OAuth 2.0 provider with Spring Security OAuth2. Next, the book will cover practical scenarios regarding some important OAuth 2.0 profiles such as Dynamic Client Registration, Token Introspection and how to revoke issued access tokens. You will then be introduced to the usage of JWT, OpenID Connect, and how to safely implement native mobile OAuth 2.0 Clients. By the end of this book, you will be able to ensure that both the server and client are protected against common vulnerabilities.
Table of Contents (16 chapters)
Title Page
About the Author
About the Reviewer
Customer Feedback

Validating JWT tokens at the Resource Server side

In the previous recipe, you learned how to generate JWT access tokens at the Authorization Server side. Now it's time to know how to validate any given JWT access token that is symmetrically signed at the Resource Server side. When the client tries to access any OAuth 2.0 protected resource with a JWT, the Resource Server has to use the same signing key used by an Authorization Server to sign the payload, to verify if the content was not changed between requests by any malicious client or user.

Getting ready

To run this recipe, you will create a Spring Boot application with Java 8, Maven, Spring Web, and Spring Security. To ease the project creation step, use Spring Initializr at and define the dependencies as Web and Security (that will declare properly all the Spring Boot starters needed for this recipe).

How to do it...

This recipe creates the project resource-server-jwt which is available at GitHub in Chapter05 folder...