package com.bsd.cases.shiro;

import com.bsd.cases.model.BoUsers;
import com.bsd.cases.service.BoUsersService;
import com.bsd.cases.util.JWTUtil;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
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.springframework.stereotype.Component;

import javax.annotation.Resource;

@Component
public class CommonRealm extends AuthorizingRealm {

    @Resource
    private BoUsersService boUsersService;

    /**
     * 大坑！，必须重写此方法，不然Shiro会报错
     */
    @Override
    public boolean supports(AuthenticationToken token) {
        return token instanceof JWTToken;
    }

    /**
     * 只有当需要检测用户权限的时候才会调用此方法，例如checkRole,checkPermission之类的
     */
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {

        String key = JWTUtil.getKey(principals.toString());
        BoUsers boUsers = boUsersService.selectByUserNoOrOpenId(key);
        SimpleAuthorizationInfo simpleAuthorizationInfo = new SimpleAuthorizationInfo();
//        simpleAuthorizationInfo.addRole(user.getRole().toString());
//        Set<String> permission = new HashSet<>(Arrays.asList(user.getPermission().split(",")));
        // simpleAuthorizationInfo.addStringPermissions(permission);
        return simpleAuthorizationInfo;
    }

    /**
     * 默认使用此方法进行用户名正确与否验证，错误抛出异常即可。
     */
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken auth) throws AuthenticationException {

        String token = (String) auth.getCredentials();
        // 解密获得username，用于和数据库进行对比
        String key = JWTUtil.getKey(token);
        if (key == null) {
            throw new AuthenticationException("token invalid");
        }

        BoUsers boUsers = boUsersService.selectByUserNoOrOpenId(key);
        if (boUsers == null) {
            throw new AuthenticationException("User didn't existed!");
        }
        if (!JWTUtil.verify(token, key)) {
            throw new AuthenticationException("Username or password error");
        }
        return new SimpleAuthenticationInfo(token, token, "common_ream");
    }
}