package com.lf.server.entity.sys;

import com.lf.server.service.sys.UserService;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.Subject;
import org.springframework.beans.factory.annotation.Autowired;

/**
 * MyRealm
 * @author
 */
public class MyRealm extends AuthorizingRealm {
    @Autowired
    UserService userService;

    /**
     * 执行授权
     *
     * @param principalCollection
     * @return
     */
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        // 认证之后，如果前端shiro标签中有出现需要权限的标签，或者过滤器中某个链接需要权限，就会进行认证
        System.out.println("执行了授权");
        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();

        // 获得当前subject
        Subject subject = SecurityUtils.getSubject();

        // 获得当前的principal,也就是认证完后我们放入的信息
        User currentUser = (User) subject.getPrincipal();

        // 添加权限
        info.addStringPermission(currentUser.getPerms());

        // 添加角色
        info.addRole(currentUser.getRole());

        return info;
    }

    /**
     * 执行认证
     *
     * @param token
     * @return
     * @throws AuthenticationException
     */
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
        System.out.println("执行了认证");
        UsernamePasswordToken userToken = (UsernamePasswordToken) token;

        // 从数据库中查询该用户
        User user = userService.queryUserByName(userToken.getUsername());

        // 如果不存在该用户，返回一个空错误，前端也可以相应显示提示
        if (user == null) {
            return null;
        }

        // 第一个参数为principal;第二个参数为从数据库中查出的用于验证的密码，shiro中密码验证不需要我们自己去做；第三个参数为realmName
        return new SimpleAuthenticationInfo(user, user.getPassword(), getName());
    }
}