/**
 * 计算签名
 */
function createFileUploadSignature({ timeStamp = 86400, procedure = '', classId = 0, oneTimeValid = 0, sourceContext = '' }) {
    // 确定签名的当前时间和失效时间
    let current = parseInt((new Date()).getTime() / 1000)
    let expired = current + timeStamp;  // 签名有效期：1天
    // 向参数列表填入参数
    let arg_list = {
        //required
        secretId: this.conf.SecretId,
        currentTimeStamp: current,
        expireTime: expired,
        random: Math.round(Math.random() * Math.pow(2, 32)),
        //opts
        procedure,
        classId,
        oneTimeValid,
        sourceContext
    }
    // 计算签名
    let orignal = querystring.stringify(arg_list);
    let orignal_buffer = new Buffer(orignal, "utf8");
    let hmac = crypto.createHmac("sha1", this.conf.SecretKey);
    let hmac_buffer = hmac.update(orignal_buffer).digest();
    let signature = Buffer.concat([hmac_buffer, orignal_buffer]).toString("base64");
    return signature;
}
/**
 * 响应签名请求
 */
function getUploadSignature(req, res) {
    res.json({
        code: 0,
        message: 'ok',
        data: {
            signature: gVodHelper.createFileUploadSignature({})
        }
    });
}