<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2020/4/13
 */

namespace app\api\service;
use think\Exception;
use think\facade\Cache;
use think\facade\Request;

class Token
{
    public static function generateToken(){

        $randChar = getRandChar(32);
        $timestamp = $_SERVER['REQUEST_TIME_FLOAT'];
        $tokenSalt = config('secure.token_salt');
        return md5($randChar . $timestamp . $tokenSalt);
    }
    public static function getCurrentTokenVar($key){
        $token = Request::header('token');
//        $vars = Cache::get($token);
        $vars = Cache::store('redis')->get($token);

        if(!$vars){
            throw new TokenException();
        }else{
            if(!is_array($vars))
            {
                $vars = json_decode($vars, true);
                return $vars;
            }

            if (array_key_exists($key, $vars)) {
                return $vars[$key];
            }
            else{
                throw new Exception('尝试获取的Token变量并不存在');
            }
        }

    }
    public static function getCurrentUid(){

        $uid = self::getCurrentTokenVar('uid');
        return $uid;
    }


    public static function isValidOperate($checkedUID){

        if(!$checkedUID){
            throw new Exception('检测UID时必须传入一个被检测的UID');
        }

        $currentOperateUID = self::getCurrentUid();
        if($currentOperateUID == $checkedUID){
            return true;
        }
        return false;

    }
}