Key FeaturesInteract with public OAuth 2.0 protected APIs such as Facebook, LinkedIn and Google.Use Spring Security and Spring Security OAuth2 to implement your own OAuth 2.0 providerLearn how to implement OAuth 2.0 native mobile clients for Android applicationsBook DescriptionOAuth 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.What you will learnUse Redis and relational databases to store issued access tokens and refresh tokensAccess resources protected by the OAuth2 Provider using Spring SecurityImplement a web application that dynamically registers itself to the Authorization ServerImprove the safety of your mobile client using dynamic client registrationProtect your Android client with Proof Key for Code ExchangeProtect the Authorization Server from invalid redirectionAbout the AuthorAdolfo Eloy Nascimento is a software engineer at Elo7, he has a Bachelors degree in Computer Science, and has been working with software development since 1999. In around 2003, he started working with web development implementing applications using ASP, PHP4/5, JavaScript, and Java (sometimes he still does some maintenance for a Ruby on Rails application). He started using OAuth 2.0 two years ago, when designing applications using microservice architectures, as well as modeling and interacting with public APIs.As a tech enthusiast, Adolfo also likes to read and learn about programming languages and new technologies. He also believes that besides creating new applications, it is also important to share the knowledge he has acquired, which is what he does by writing for his personal blog, writing articles for Java Magazine in Brazil, and also writing tech books.Table of ContentsOAuth 2.0 foundationsImplementing Your Own OAuth 2.0 ProviderUsing an API protected with OAuth 2.0Working with OAuth 2.0 profilesSelf contained tokens with JWTOpenID Connect for authenticationImplementing Mobile ClientsAvoiding common vulnerabilities