video_server/app/Repositories/Utils/CdnRepository.php

<?php

namespace App\Repositories\Utils;

use Carbon\Carbon;

class CdnRepository
{
    /**
     * 主密码
     * @var string
     */
    protected $key1 = 'AwMnF1TSnIvyhmC9';

    /**
     * 辅密码
     * @var string
     */
    protected $key2 = 'g84alOZMtOrU3C2e';

    /**
     * 获取鉴权query参数key=value
     * @param $fileRelativePath
     * @return string
     */
    public function getSignKeyValue($fileRelativePath)
    {
        // 过期时间，这里设置3小时后的timestamp.
        $expiredTime = Carbon::now()->addHours(3)->timestamp;
        $sstring = $fileRelativePath."-".$expiredTime."-0-0-".$this->key1;
        $md5 = md5($sstring);
        $authKey = "auth_key=".$expiredTime."-0-0-".$md5;

        return $authKey;
    }
}