SecurityManager securityManager = injector.getInstance(SecurityManager.class);

        // for this simple example quickstart, make the SecurityManager
        // accessible as a JVM singleton.  Most applications wouldn't do this
        // and instead rely on their container configuration or web.xml for
        // webapps.  That is outside the scope of this simple quickstart, so
        // we'll just do the bare minimum so you can continue to get a feel
        // for things.
        SecurityUtils.setSecurityManager(securityManager);

        // Now that a simple Shiro environment is set up, let's see what you can do:

        // get the currently executing user:
        Subject currentUser = SecurityUtils.getSubject();

        // Do some stuff with a Session (no need for a web or EJB container!!!)
        Session session = currentUser.getSession();
        session.setAttribute("someKey", "aValue");
        String value = (String) session.getAttribute("someKey");
        if (value.equals("aValue")) {
            log.info("Retrieved the correct value! [" + value + "]");
        }

        // let's login the current user so we can check against roles and permissions:
        if (!currentUser.isAuthenticated()) {
            UsernamePasswordToken token = new UsernamePasswordToken("lonestarr", "vespa");
            token.setRememberMe(true);
            try {
                currentUser.login(token);
            } catch (UnknownAccountException uae) {
                log.info("There is no user with username of " + token.getPrincipal());
            } catch (IncorrectCredentialsException ice) {
                log.info("Password for account " + token.getPrincipal() + " was incorrect!");
            } catch (LockedAccountException lae) {
                log.info("The account for username " + token.getPrincipal() + " is locked.  " +
                        "Please contact your administrator to unlock it.");
            }
            // ... catch more exceptions here (maybe custom ones specific to your application?
            catch (AuthenticationException ae) {
                //unexpected condition?  error?
            }
        }

        //say who they are:
        //print their identifying principal (in this case, a username):
        log.info("User [" + currentUser.getPrincipal() + "] logged in successfully.");

        //test a role:
        if (currentUser.hasRole("schwartz")) {
            log.info("May the Schwartz be with you!");
        } else {
            log.info("Hello, mere mortal.");
        }

        //test a typed permission (not instance-level)
        if (currentUser.isPermitted("lightsaber:wield")) {
            log.info("You may use a lightsaber ring.  Use it wisely.");
        } else {
            log.info("Sorry, lightsaber rings are for schwartz masters only.");
        }

        //a (very powerful) Instance Level permission:
        if (currentUser.isPermitted("winnebago:drive:eagle5")) {
            log.info("You are permitted to 'drive' the winnebago with license plate (id) 'eagle5'.  " +
                    "Here are the keys - have fun!");
        } else {
            log.info("Sorry, you aren't allowed to drive the 'eagle5' winnebago!");
        }

        //all done - log out!
        currentUser.logout();

        System.exit(0);
    }
}

public class SampleShiroServletModule extends ShiroWebModule {
    private final ServletContext servletContext;

    public SampleShiroServletModule(ServletContext servletContext) {
        super(servletContext);

        this.servletContext = servletContext;
    }

    @Override
    protected void configureShiroWeb() {
        bindConstant().annotatedWith(Names.named("shiro.loginUrl")).to("/login.jsp");
        try {
            this.bindRealm().toConstructor(IniRealm.class.getConstructor(Ini.class));
        } catch (NoSuchMethodException e) {
            addError("Could not locate proper constructor for IniRealm.", e);
        }

        this.addFilterChain("/login.jsp", AUTHC);
        this.addFilterChain("/logout", LOGOUT);
        this.addFilterChain("/account/**", AUTHC);

        this.addFilterChain("/remoting/**",
                        filterConfig(AUTHC),
                        filterConfig(ROLES, "b2bClient"),
                        filterConfig(PERMS, "remote:invoke:lan,wan"));
    }

    @Provides
    @Singleton
    Ini loadShiroIni() throws MalformedURLException {
        URL iniUrl = servletContext.getResource("/WEB-INF/shiro.ini");
        return Ini.fromResourcePath("url:" + iniUrl.toExternalForm());
    }

    @Override
    protected void bindWebSecurityManager(AnnotatedBindingBuilder<? super WebSecurityManager> bind) {
        try {
            String cipherKey = loadShiroIni().getSectionProperty("main", "securityManager.rememberMeManager.cipherKey");

            DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
            CookieRememberMeManager rememberMeManager = new CookieRememberMeManager();
            rememberMeManager.setCipherKey(Base64.decode(cipherKey));
            securityManager.setRememberMeManager(rememberMeManager);
            bind.toInstance(securityManager);
        } catch (MalformedURLException e) {
            // for now just throw, you could just call
            // super.bindWebSecurityManager(bind) if you do not need rememberMe functionality
            throw new ConfigurationException("securityManager.rememberMeManager.cipherKey must be set in shiro.ini.");
        }


    }
}

@Configuration
@ControllerAdvice
@SpringBootApplication
public class WebApp {

    private static Logger log = LoggerFactory.getLogger(WebApp.class);

    public static void main(String[] args) {

        SpringApplication.run(WebApp.class, args);
    }

    @ExceptionHandler(AuthorizationException.class)
    @ResponseStatus(HttpStatus.FORBIDDEN)
    public String handleException(AuthorizationException e, Model model) {

        // you could return a 404 here instead (this is how github handles 403, so the user does NOT know there is a
        // resource at that location)
        log.debug("AuthorizationException was thrown", e);

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("status", HttpStatus.FORBIDDEN.value());
        map.put("message", "No message available");
        model.addAttribute("errors", map);

        return "error";
    }

    @Bean
    public Realm realm() {
        TextConfigurationRealm realm = new TextConfigurationRealm();
        realm.setUserDefinitions("joe.coder=password,user\n" + "jill.coder=password,admin");

        realm.setRoleDefinitions("admin=read,write\n" + "user=read");
        realm.setCachingEnabled(true);
        return realm;
    }

    @Bean
    public ShiroFilterChainDefinition shiroFilterChainDefinition() {
        DefaultShiroFilterChainDefinition chainDefinition = new DefaultShiroFilterChainDefinition();
        // need to accept POSTs from the login form
        chainDefinition.addPathDefinition("/login.html", "authc");
        chainDefinition.addPathDefinition("/logout", "logout");
        return chainDefinition;
    }

    @ModelAttribute(name = "subject")
    public Subject subject() {
        return SecurityUtils.getSubject();
    }
}

public class ShiroAutoConfiguration extends AbstractShiroConfiguration {

    @Bean
    @ConditionalOnMissingBean
    @Override
    protected AuthenticationStrategy authenticationStrategy() {
        return super.authenticationStrategy();
    }

    @Bean
    @ConditionalOnMissingBean
    @Override
    protected Authenticator authenticator() {
        return super.authenticator();
    }

    @Bean
    @ConditionalOnMissingBean
    @Override
    protected Authorizer authorizer() {
        return super.authorizer();
    }

    @Bean
    @ConditionalOnMissingBean
    @Override
    protected SubjectDAO subjectDAO() {
        return super.subjectDAO();
    }

    @Bean
    @ConditionalOnMissingBean
    @Override
    protected SessionStorageEvaluator sessionStorageEvaluator() {
        return super.sessionStorageEvaluator();
    }

    @Bean
    @ConditionalOnMissingBean
    @Override
    protected SubjectFactory subjectFactory() {
        return super.subjectFactory();
    }

    @Bean
    @ConditionalOnMissingBean
    @Override
    protected SessionFactory sessionFactory() {
        return super.sessionFactory();
    }

    @Bean
    @ConditionalOnMissingBean
    @Override
    protected SessionDAO sessionDAO() {
        return super.sessionDAO();
    }

    @Bean
    @ConditionalOnMissingBean
    @Override
    protected SessionManager sessionManager() {
        return super.sessionManager();
    }

    @Bean
    @ConditionalOnMissingBean
    @Override
    protected SessionsSecurityManager securityManager(List<Realm> realms) {
        return super.securityManager(realms);
    }

    @Bean
    @ConditionalOnResource(resources = "classpath:shiro.ini")

}

    /**
     * Returns a hex-encoded string of the underlying {@link #getBytes byte array}.
     * <p/>
     * This implementation caches the resulting hex string so multiple calls to this method remain efficient.
     * However, calling {@link #setBytes setBytes} will null the cached value, forcing it to be recalculated the
     * next time this method is called.
     *
     * @return a hex-encoded string of the underlying {@link #getBytes byte array}.
     */
    @Override
    public String toHex() {
        if (this.hexEncoded == null) {
            this.hexEncoded = Hex.encodeToString(getBytes());
        }
        return this.hexEncoded;
    }

    /**
     * Returns a Base64-encoded string of the underlying {@link #getBytes byte array}.
     * <p/>
     * This implementation caches the resulting Base64 string so multiple calls to this method remain efficient.
     * However, calling {@link #setBytes setBytes} will null the cached value, forcing it to be recalculated the
     * next time this method is called.
     *
     * @return a Base64-encoded string of the underlying {@link #getBytes byte array}.
     */
    @Override
    public String toBase64() {
        if (this.base64Encoded == null) {
            //cache result in case this method is called multiple times.
            this.base64Encoded = Base64.encodeToString(getBytes());
        }
        return this.base64Encoded;
    }

    /**
     * Simple implementation that merely returns {@link #toHex() toHex()}.
     *
     * @return the {@link #toHex() toHex()} value.
     */
    @Override
    public String toString() {
        return toHex();
    }

    /**
     * Returns {@code true} if the specified object is a Hash and its {@link #getBytes byte array} is identical to
     * this Hash's byte array, {@code false} otherwise.
     *
     * @param o the object (Hash) to check for equality.
     * @return {@code true} if the specified object is a Hash and its {@link #getBytes byte array} is identical to
     * this Hash's byte array, {@code false} otherwise.
     */
    @Override
    public boolean equals(Object o) {
        if (o instanceof Hash) {
            Hash other = (Hash) o;
            return MessageDigest.isEqual(getBytes(), other.getBytes());
        }
        return false;
    }

    /**
     * Simply returns toHex().hashCode();
     *
     * @return toHex().hashCode()
     */
    @Override
    public int hashCode() {
        if (this.bytes == null || this.bytes.length == 0) {
            return 0;
        }
        return Arrays.hashCode(this.bytes);
    }

}

@Component
public class QuickStart {

    private static Logger log = LoggerFactory.getLogger(QuickStart.class);

    @Autowired
    private SecurityManager securityManager;

    @Autowired
    private SimpleService simpleService;

    public void run() {

        // get the current subject
        Subject subject = SecurityUtils.getSubject();

        // Subject is not authenticated yet
        Assert.isTrue(!subject.isAuthenticated());

        // login the subject with a username / password
        UsernamePasswordToken token = new UsernamePasswordToken("joe.coder", "password");
        subject.login(token);

        // joe.coder has the "user" role
        subject.checkRole("user");

        // joe.coder does NOT have the admin role
        Assert.isTrue(!subject.hasRole("admin"));

        // joe.coder has the "read" permission
        subject.checkPermission("read");

        // current user is allowed to execute this method.
        simpleService.readRestrictedCall();

        try {
            // but not this one!
            simpleService.writeRestrictedCall();
        } catch (AuthorizationException e) {
            log.info("Subject was NOT allowed to execute method 'writeRestrictedCall'");
        }

        // logout
        subject.logout();
        Assert.isTrue(!subject.isAuthenticated());
    }


    /**
     * Sets the static instance of SecurityManager. This is NOT needed for web applications.
     */
    @PostConstruct
    private void initStaticSecurityManager() {
        SecurityUtils.setSecurityManager(securityManager);
    }
}

@Controller
public class HelloController {

    @SuppressWarnings("Duplicates")
    @RequestMapping("/")
    public String home(HttpServletRequest request, Model model) {

        String name = "World";

        Subject subject = SecurityUtils.getSubject();

        PrincipalCollection principalCollection = subject.getPrincipals();

        if (principalCollection != null && !principalCollection.isEmpty()) {
            Collection<Map> principalMaps = subject.getPrincipals().byType(Map.class);
            if (CollectionUtils.isEmpty(principalMaps)) {
                name = subject.getPrincipal().toString();
            } else {
                name = (String) principalMaps.iterator().next().get("username");
            }
        }

        model.addAttribute("name", name);

        return "hello";
    }

}

protected AuthenticationToken createToken(ServletRequest request, ServletResponse response) {
        String authorizationHeader = getAuthzHeader(request);
        if (authorizationHeader == null || authorizationHeader.length() == 0) {
            // Create an empty authentication token since there is no
            // Authorization header.
            return createToken("", "", request, response);
        }

        LOGGER.debug("Attempting to execute login with auth header");

        String[] prinCred = getPrincipalsAndCredentials(authorizationHeader, request);
        if (prinCred == null || prinCred.length < 2) {
            // Create an authentication token with an empty password,
            // since one hasn't been provided in the request.
            String username = prinCred == null || prinCred.length == 0 ? "" : prinCred[0];
            return createToken(username, "", request, response);
        }

        String username = prinCred[0];
        String password = prinCred[1];

        return createToken(username, password, request, response);
    }