OAuth implementation using Spring Security

OAuth 2.0 is a way of securing APIs. Spring Security provides Spring Cloud Security and Spring Cloud OAuth2 components for implementing the grant flows we discussed earlier.

Security microservice

We'll create one more service, a security-service, which will control authentication and authorization, and also act as a resource server.

Create a new microservice, security-service, the way other microservices have been created and then follow the following steps:

1. First, add Spring Security and Spring Security OAuth 2 dependencies in pom.xml:

<dependency> 
   <groupId>org.springframework.cloud</groupId> 
   <artifactId>spring-cloud-starter-security</artifactId...