screen/application/service/byte_dance/ByteDanceAccessToken.php

<?php
namespace app\service\byte_dance;

use think\Cache;

class ByteDanceAccessToken implements ByteDanceInterface {
    protected $appId;
    protected $appSecret;
    protected $cacheName='cache_bytedance_access_token';
    public function get()
    {
        $token=Cache::get($this->cacheName);
        if(!$token){
            $request=ByteDance::httpPost('https://developer.toutiao.com/api/apps/v2/token',[
                'appid'=>$this->appId,
                'secret'=>$this->appSecret,
                'grant_type'=>'client_credential',
            ]);
            $token=$request['access_token'];
            Cache::set($this->cacheName,$token,$request['expires_in']-10);
        }
        return $token;
    }

    /**
     * @param mixed $appId
     */
    public function setAppId($appId)
    {
        $this->appId = $appId;
        return $this;
    }

    /**
     * @param mixed $appSecret
     */
    public function setAppSecret($appSecret)
    {
        $this->appSecret = $appSecret;
        return $this;
    }
}