官方文档： https://pay.weixin.qq.com/doc/v3/partner/4012760240?from=https%3A%2F%2Fpay.weixin.qq.com%2Fdocs%2Fpartner%2Fapis%2Fmerchant-exclusive-coupon%2Fupload-image.html

爹爹们，谁能给个nodejs 上传图片（营销专用）接口能正常使用的代码？ 调试到自闭了

const { KJUR, hextob64 } = require('jsrsasign')
const axios = require('axios')
const fs = require('fs')



// 上传图片
async function upload(req, res, next) {
    try {
        const method = 'POST'
        const pathname = '/v3/marketing/favor/media/image-upload'
        const timestamp = Math.round(new Date().getTime() / 1000);  // 十位的时间戳
        const onece_str = await randomString()  // 随机字符串
        const bodyParamsStr = {
            filename: 'wechatpay_logo.png',
            sha256: 'd2973a45b1d528c21ebb77792ef3fcea40fa9a4e04a17e35369102ba9c84c8b1'
        }
        const mchid = '***'  // 商户号
        const serial_no = '***'  // 商户API证书序列号
        const private_key = `***`// appiclient_key.pem里的内容全部复制过来
        const signature = await rsaSign(`${method}\n${pathname}\n${timestamp}\n${onece_str}\n${JSON.stringify(bodyParamsStr)}\n`, private_key, 'SHA256withRSA')
        //获取到signature后就可以获取到Authorization了
        let Authorization = `WECHATPAY2-SHA256-RSA2048 mchid="${mchid}",nonce_str="${onece_str}",timestamp="${timestamp}",signature="${signature}",serial_no="${serial_no}"`
        
        const formData = new FormData();
        formData.append('file', fs.createReadStream('./test.png'));
        formData.append('meta', bodyParamsStr);
        const data = await axios.post('https://api.mch.weixin.qq.com/v3/marketing/favor/media/image-upload', formData, {
            headers: {
                Authorization,
                'Content-Type': 'multipart/form-data;boundary=boundary',
                'Accept': 'application/json'
            }
        })
        console.log(data);
        res.json(data.data)
    } catch (error) {
        console.log(error.response.data);
        // return next(error)
    }
}


// 加密
async function rsaSign(content, privateKey, hash = 'SHA256withRSA') {
    console.log(content, 11111);
    
    // 创建 Signature 对象
    const signature = new KJUR.crypto.Signature({
        alg: hash,
        //!这里指定 私钥 pem!
        prvkeypem: privateKey
    })
    signature.updateString(content)
    const signData = signature.sign()
    // 将内容转成base64
    return hextob64(signData)
}


// 生成随机数
async function randomString(e = 32) {
    const t = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'
    const a = t.length
    let n = ''
    for (let index = 0; index < e; index++) {
        n += t.charAt(Math.floor(Math.random() * a))
    }
    return n.toUpperCase()
}



upload()

报错：

{
  code: 'SIGN_ERROR',
  detail: {
    detail: { issue: 'sign not match' },
    field: 'signature',
    location: 'authorization',
    sign_information: {
      method: 'POST',
      sign_message_length: 104,
      truncated_sign_message: 'POST\n' +
        '/v3/marketing/favor/media/image-upload\n' +
        '1751199760\n' +
        'KETTK3NNYARDZFHEXWNQRFBYQNP4BXYS\n' +
        '[object \n',
      url: '/v3/marketing/favor/media/image-upload'
    }
  },
  message: '错误的签名，验签失败'
}