Introduce Spring Boot Security into the Calculator Application

This Post is in continuation to the previous demonstration of Spring Boot Simple Calculator application http://rbc-spring-boot-samples.blogspot.com/

Here we look at adding spring-security component to our application

It includes
1) Service configuration
2) Client authentication

Service Configuration
1) Maven
Add the security starter dependency

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

Restart the Application. The Spring scanner looks for Spring Security being loaded into the classpath and adds the below Filters in the chain:

Creating filter chain: org.springframework.security.web.util.matcher.AnyRequestMatcher@1, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@338a4c61, org.springframework.security.web.context.SecurityContextPersistenceFilter@36665c11, org.springframework.security.web.header.HeaderWriterFilter@4152bd0f, org.springframework.security.web.csrf.CsrfFilter@24018c8b, org.springframework.security.web.authentication.logout.LogoutFilter@4c41a177, org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter@10d4b573, org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter@62ab5e63, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@2b6fcca1, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@3a709cc7, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@3e01796a, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@839755f, org.springframework.security.web.session.SessionManagementFilter@e4b54d3, org.springframework.security.web.access.ExceptionTranslationFilter@2976ef56, org.springframework.security.web.access.intercept.FilterSecurityInterceptor

Importantly, it generates a default security password:
Default user id: user
Using generated security password: 0xxxxxx1-7xx5-4xx9-8xxf-2xxxxxxxxxxx9

2) Client authentication

Hit the URL : http://localhost:7070/add?number1=34&number2=44

It takes you to the Basic authentication Page as below:

Give the User: User password : 0xxxxxx1-7xx5-4xx9-8xxf-2xxxxxxxxxxx9


It shows the Result as 78 after successful login

Otherwise it shows: