/**

 * Simple Quickstart application showing how to use Shiro's API.

 *

 * @since 0.9 RC2

 */

public class Quickstart {

    private static final transient Logger log = LoggerFactory.getLogger(Quickstart.class);

    public static void main(String[] args) {

        // The easiest way to create a Shiro SecurityManager with configured

        // realms, users, roles and permissions is to use the simple INI config.

        // We'll do that by using a factory that can ingest a .ini file and

        // return a SecurityManager instance:

        // Use the shiro.ini file at the root of the classpath

        // (file: and url: prefixes load from files and urls respectively):

        Factory<SecurityManager> factory = new IniSecurityManagerFactory("classpath:shiro.ini");

        SecurityManager securityManager = factory.getInstance();

        // 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:

        // 获取当前的 Subject. 调用 SecurityUtils.getSubject();

        Subject currentUser = SecurityUtils.getSubject();

        // Do some stuff with a Session (no need for a web or EJB container!!!)

        // 测试使用 Session

        // 获取 Session: Subject#getSession()

        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:

        // 测试当前的用户是否已经被认证. 即是否已经登录.

        // 调动 Subject 的 isAuthenticated()

        if (!currentUser.isAuthenticated()) {

            // 把用户名和密码封装为 UsernamePasswordToken 对象

            UsernamePasswordToken token = new UsernamePasswordToken("lonestarr", "vespa");

            // rememberme

            token.setRememberMe(true);

            try {

                // 执行登录.

                currentUser.login(token);

            }

            // 若没有指定的账户, 则 shiro 将会抛出 UnknownAccountException 异常.

            catch (UnknownAccountException uae) {

                log.info("----> There is no user with username of " + token.getPrincipal());

                return;

            }

            // 若账户存在, 但密码不匹配, 则 shiro 会抛出 IncorrectCredentialsException 异常。

            catch (IncorrectCredentialsException ice) {

                log.info("----> Password for account " + token.getPrincipal() + " was incorrect!");

                return;

            }

            // 用户被锁定的异常 LockedAccountException

            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?

            // 所有认证时异常的父类.

            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:

        // 测试是否有某一个角色. 调用 Subject 的 hasRole 方法.

        if (currentUser.hasRole("schwartz")) {

            log.info("----> May the Schwartz be with you!");

        } else {

            log.info("----> Hello, mere mortal.");

            return;

        }

        //test a typed permission (not instance-level)

        // 测试用户是否具备某一个行为. 调用 Subject 的 isPermitted() 方法。

        if (currentUser.isPermitted("lightsaber:weild")) {

            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:

        // 测试用户是否具备某一个行为.

        if (currentUser.isPermitted("user:delete:zhangsan")) {

            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!

        // 执行登出. 调用 Subject 的 Logout() 方法.

        System.out.println("---->" + currentUser.isAuthenticated());

        currentUser.logout();

        System.out.println("---->" + currentUser.isAuthenticated());

        System.exit(0);

    }

}