let res = await cloud.downloadFile({ fileID: event.fileID })

let filebuffer = res.fileContent

let filename = event.filename

let sha256 = crypto.createHash('sha256').update(filebuffer).digest('hex')

var body = JSON.stringify({

'filename': filename, 'sha256': sha256

})

let method = 'POST'

let url = '/v3/merchant/media/upload'

// let jsonStr = JSON.stringify({ filename, sha256 })

var timestamp = Date.parse(new Date()) / 1000

const randomstr = '95E9D72DB0389359EB54850779354B21'

var data = method + '\n' +

url + '\n' +

timestamp + '\n' +

randomstr + '\n' +

body + '\n'

// console.log('data>>>>>>>>>>>>>>>>>',data)

let sign = crypto.createSign('RSA-SHA256');

sign.update(new Buffer(data, 'utf-8'));

let sig = sign.sign(privateKey, 'base64');

console.log(sig)

body = '--boundary'+'\n'+'\r\n'

+'Content-Disposition: form-data; name="meta";'+'\n'+'\r\n'

+'Content-Type: application/json' + '\n'+'\r\n'

+body+'\n'+'\r\n'

+'--boundary'+'\n'+'\r\n'

+'Content-Disposition: form-data; name="file"; filename="'+filename+'";'+'\n'+'\r\n'

+'Content-Type: image/png'+'\n'+'\r\n'

+'\n'+'\r\n'

+filebuffer+'\n'+'\r\n'

+'--boundary--'+'\n'+'\r\n'

console.log(body)

// //////////////////////////////////////////

var mchid = 'xxxxxx'

var serial_no = 'xxxxxxxxx'

var options = {

method: method,

headers: {

'Accept': 'application/json',

// 'Content-Type':'application/json',

'Content-Type': 'multipart/form-data;boundary=boundary',

'Accept-Charset': 'utf-8',

'User-Agent': 'my-reddit-client',

'Authorization': 'WECHATPAY2-SHA256-RSA2048 mchid="'+mchid+'",nonce_str="'+randomstr+'",signature="'+sig+'",timestamp="'+timestamp+'",serial_no="'+serial_no+'"'

},

body: body,

uri: "https://api.mch.weixin.qq.com"+url

};

return rp(options).then(

function (res) {

console.log(res)

return res

}

).catch(

function (err) {

console.log(err)

return err

}

)