bot-simple-image-process.js

var login = require('facebook-chat-api')
var config = require('./config.json')
var request = require('request')
var fs = require('fs')
var Jimp = require('jimp')

var download = function (uri, filename, callback) {
  request.head(uri, function (err, res, body) {
    request(uri).pipe(fs.createWriteStream(filename)).on('close', callback)
  })
}

login({email: config.login, password: config.password}, function (err, bot) {
  if(err) return console.error(err)
  bot.listen((err, message) => {
    if (err) return
    console.log(message)
    if (
      message.attachments == null ||
      message.attachments[0] == null
    ) return
    const pictureUrl = message.attachments[0].largePreviewUrl
    const filePath = './pictures/' + message.attachments[0].name + '.jpg'
    const editedPath = './pictures/' + message.attachments[0].name + '-processed.jpg'
    download(pictureUrl, filePath, function () {
      console.log('downloaded', filePath)
      Jimp.read(filePath, function (err, image) {
        if (err) return console.error('err', err)
        Jimp.loadFont(Jimp.FONT_SANS_32_BLACK).then(function (font) {
          image
            .print(font, 0, 0, 'HI THERE', image.bitmap.width)
            .greyscale()
            .write(editedPath, () => {
              bot.sendMessage({
                attachment: fs.createReadStream(editedPath)
              }, message.threadID)
            })
        })
      })
    })
  })
})