企业微信发送图片

qywx-bot-post-image.js

const axios = require('axios').default
const textToImage = require('text-to-image');
const crypto = require('crypto')

const text = process.argv[2] || 'Hello World!'

const md5= (str) => crypto.createHash('md5').update(str).digest('hex');

const botUrl = process.env.TEST_BOT_URL

const test = async () => {
  const dataUrl = await textToImage.generate(text)
  const byteString = dataUrl.substr(dataUrl.indexOf(',') + 1)
  const buffer = Buffer.from(byteString, 'base64')
  const md5Str = md5(buffer)
  const res = await axios.post(botUrl, {
    msgtype: 'image',
    image: {
        base64: byteString,
        md5: md5Str
    }
  }, {
    responseType: 'blob'
  })
  console.log('res is: ', res.data)
}

test().catch(err => {
  console.error(err)
  process.exit(1)
})