API token身份验证 （thinkphp5）

 使用说明：登陆时生成token和刷新用的refresh_token,返回给客户端，客户端收到保存本地localStorage等，每次访问接口带上token，后端验证token存在并且一致后方可执行接下来的动作，假如不存在就返回token过期，客户端调用刷新接口传入token和refresh_token,服务器端进行验证，验证通过重新生成新的token保存数据库，返回给客户端客户端刷新本地token访问即可继续，当refresh_token验证失败就清除数据库token，过期时间等信息

 简单的token生成函数（公共函数文件common）

function create_token($id,$out_time){
    return substr(md5($id.$out_time),5,26);
}

 验证登陆方法（模型）

    public function checkLogin($username,$passwd){
        $driver = self::field('driver_id,passwd')->where('zhanghao',$username)->whereOr('phone',$username)->find();
        if (empty($driver)){
            $this->error = '账号不存在';
            return false;
        }
        if ($driver['passwd'] != md5($passwd)){
            $this->error = "密码不正确";
            return false;
        }

        //$out_time = strtotime('+ 1 days');
        $out_time = strtotime('+ 1 minutes');
        $token = create_token($driver['driver_id'],$out_time);
        if(false===self::save(['token'=>$token,'time_out'=>$out_time],['driver_id'=>$driver['driver_id']])){
            $this->error = '登陆失败';
            return false;
        }
        $refresh_token_out_time = strtotime('+ 5 days');
        $refresh_token = create_token($driver['driver_id'],$refresh_token_out_time);
        Cache::set("token",$token,60);
        Cache::set("driver_id",$driver['driver_id'],$refresh_token_out_time);//设置ID的过期时间和更新token的token时间一样用于更新的时候获取用户信息
        Cache::set('refresh_token',$refresh_token,$refresh_token_out_time);
        return ['token'=>$token,'refresh_token'=>$refresh_token,'in_expire'=>$out_time];
    }

token刷新方法（模型）

    public function refreshToken($refresh_token,$token){
        if (!isset(Cache::get('refresh_token')) or  Cache::get('refresh_token')!=$refresh_token){
            $this->error = '刷新token失败';
            return false;
        }
        $cache_driver_id = Cache::get('driver_id');
        $driver = self::field('driver_id,passwd')->where('driver_id',$cache_driver_id)->where('token',$token)->find();
        if (empty($driver)){
            $this->error = '参数错误';
            return false;
        }
        $out_time = strtotime('+ 1 days');//新的过期时间
        $token = create_token($driver['driver_id'],$out_time);//更新token
        if(false===self::save(['token'=>$token,'time_out'=>$out_time],['driver_id'=>$driver['driver_id']])){
            Cache::clear($token);
            $this->error = '刷新失败';
            return false;
        }
        Cache::set("token",$token,864000);
        return ['token'=>$token,'in_expire'=>$out_time];
    }

 退出方法（模型）

    public function logout($token,$refresh_token=''){
        $driver = self::field('driver_id,passwd')->where('token',$token)->find();
        self::save(['token'=>'','time_out'=>''],['token'=>$token]);
        Cache::clear('token');
        Cache::clear('refresh_token');
    }