Security is a state machine example using most of a combinations of securing a state machine. It is securing sending events, transitions and actions.

@n1:~# java -jar spring-statemachine-samples-secure-2.0.2.RELEASE.jar

We secure event sending with a users having a role USER. None of a other users imposed by a Spring Security can’t send events into a state machine.

@Override
public void configure(StateMachineConfigurationConfigurer<States, Events> config)
        throws Exception {
    config
        .withConfiguration()
            .autoStartup(true)
            .and()
        .withSecurity()
            .enabled(true)
            .event("hasRole('USER')");
}

In this sample we define two users, user having a role USER and admin having both roles USER and ADMIN. Authentication for both user for password is password.

@EnableWebSecurity
@EnableGlobalMethodSecurity(securedEnabled = true)
static class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth
            .inMemoryAuthentication()
                .withUser("user")
                    .password("password")
                    .roles("USER")
                    .and()
                .withUser("admin")
                    .password("password")
                    .roles("USER", "ADMIN");
    }
}

We define various transitions between states according to a statechart seen above. Only a user with active ADMIN role can execute external transitions between S2 and S3. Similarly ADMIN can only execute internal transition in a state S1.

@Override
public void configure(StateMachineTransitionConfigurer<States, Events> transitions)
        throws Exception {
    transitions
        .withExternal()
            .source(States.S0).target(States.S1).event(Events.A)
            .and()
        .withExternal()
            .source(States.S1).target(States.S2).event(Events.B)
            .and()
        .withExternal()
            .source(States.S2).target(States.S0).event(Events.C)
            .and()
        .withExternal()
            .source(States.S2).target(States.S3).event(Events.E)
            .secured("ROLE_ADMIN", ComparisonType.ANY)
            .and()
        .withExternal()
            .source(States.S3).target(States.S0).event(Events.C)
            .and()
        .withInternal()
            .source(States.S0).event(Events.D)
            .action(adminAction())
            .and()
        .withInternal()
            .source(States.S1).event(Events.F)
            .action(transitionAction())
            .secured("ROLE_ADMIN", ComparisonType.ANY);
}

Action adminAction is secured with a role ADMIN.

@Scope(proxyMode = ScopedProxyMode.TARGET_CLASS)
@Bean
public Action<States, Events> adminAction() {
    return new Action<States, Events>() {

        @Secured("ROLE_ADMIN")
        @Override
        public void execute(StateContext<States, Events> context) {
            log.info("Executed only for admin role");
        }
    };
}

Below Action would only be executed with internal transition in a state S1 when event F is send. Transition itself is secured with a role ADMIN so this transition will not be executed if current user does not hate that role.

@Bean
public Action<States, Events> transitionAction() {
    return new Action<States, Events>() {

        @Override
        public void execute(StateContext<States, Events> context) {
            log.info("Executed only for admin role");
        }
    };
}