[游戏开发]Shiro中自定义Realm

在Shiro中，如果没有自定义Realm的话，那么权限管理数据是通过IniRealm的形式去读取配置文件shiro.ini来加载数据，但是以后的权限管理数据肯定都是来源于数据库的，所以我们要把数据更改到数据库。

shiro提供的Realm

在SimpleAccountRealm类中进行认证

在SimpleAccountRealm类中有两个方法，分别提供认证和授权

public class SimpleAccountRealm extends AuthorizingRealm {
   //省略
    //用于认证的方法
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
        UsernamePasswordToken upToken = (UsernamePasswordToken)token;
        SimpleAccount account = this.getUser(upToken.getUsername());
        if (account != null) {
            if (account.isLocked()) {
                throw new LockedAccountException("Account [" + account + "] is locked.");
            }

            if (account.isCredentialsExpired()) {
                String msg = "The credentials for account [" + account + "] are expired";
                throw new ExpiredCredentialsException(msg);
            }
        }

        return account;
    }
    //用于授权的方法
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
        String username = this.getUsername(principals);
        this.USERS_LOCK.readLock().lock();

        AuthorizationInfo var3;
        try {
            var3 = (AuthorizationInfo)this.users.get(username);
        } finally {
            this.USERS_LOCK.readLock().unlock();
        }

        return var3;
    }
}

自定义Realm

/**
 * @auther heling
 * @date 2021/10/4
 * 自定义realm实现，将认证/授权数据来源转为数据库的实现
 */
public class CustomerRealm extends AuthorizingRealm {
    //授权
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        return null;
    }

    //认证
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {
        //在token中获取用户名
        String principal = (String)authenticationToken.getPrincipal();
        System.out.println(principal);
        //根据身份信息使用jdbc mybatis查询相关数据库
        if("heling".equals(principal)){
            //参数1:返回数据库中正确的用户名
            //参数2:返回数据库中正确密码
            //参数3:提供当前realm的名字 this.getName();
            SimpleAuthenticationInfo simpleAuthenticationInfo = new SimpleAuthenticationInfo(principal,"123",this.getName());
            return simpleAuthenticationInfo;
        }
        return null;
    }
}

使用自定义Realm认证

/**
 * @auther heling
 * @date 2021/10/4
 * 使用自定义realm
 */
public class TestCustomerRealmAuthenticator {
    public static void main(String[] args) {
        //创建securityManager
        DefaultSecurityManager defaultSecurityManager = new DefaultSecurityManager();
        //设置自定义realm
        defaultSecurityManager.setRealm(new CustomerRealm());
        //将安全工具类设置安全管理器
        SecurityUtils.setSecurityManager(defaultSecurityManager);
        //通过安全工具类获取subject
        Subject subject = SecurityUtils.getSubject();
        //创建token
        UsernamePasswordToken token = new UsernamePasswordToken("heling", "123");

        try{
            System.out.println("认证状态：" + subject.isAuthenticated());
            subject.login(token); //用户认证
            System.out.println("认证状态：" + subject.isAuthenticated());
        }catch (UnknownAccountException e){
            e.printStackTrace();
            System.out.println("认证失败：用户名不存在");
        }catch (IncorrectCredentialsException e){
            e.printStackTrace();
            System.out.println("认证失败：密码错误");
        }

    }
}