prisme-flow/nodes/bridge/bot/lib/facebook/facebook.js

prisme platform flow engine

/**
 * Created by prisme.io on 09/06/2017.
 */

var request = require('request').defaults({ encoding: null })
var _ = require('underscore')
var os = require('os')
var fs = require('fs')

// local vars, store temporary profiles
var _profiles = {}

module.exports = {

  getOrFetchProfile: function (facebookId, bot) {
    return new Promise(function (resolve, reject) {
      // if id is null, then spit out a test user
      if (facebookId == null) {
        resolve({
          first_name: 'Test user first name',
          last_name: 'Test user last name'
        })
        return
      }
      if (_profiles[facebookId] != null) {
        resolve(_profiles[facebookId])
      } else {
        // ask facebook
        bot.getProfile(facebookId)
          .then(function (profile) {
            _profiles[facebookId] = profile
            resolve(profile)
          })
          .catch(function (err) {
            reject('Unable to get profile info for ' + facebookId + (err.message != null ? ' - ' + err.message : ''))
          })
      }
    })
  },

  downloadFile: function (url, token) {
    return new Promise(function (resolve, reject) {
      var options = {
        url: url
      }
      request(options, function (error, response, body) {
        if (error) {
          reject(error)
        } else {
          resolve(body)
        }
      })
    })
  },

  uploadBuffer: function (params) {
    return new Promise(function (resolve, reject) {
      params = _.extend({
        recipient: null,
        filename: 'tmp-file',
        token: null,
        buffer: null,
        type: 'image',
        mimeType: 'application/octet-stream'
      }, params)

      var tmpFile = os.tmpdir() + '/' + params.filename

      // write to filesystem to use stream
      fs.writeFile(tmpFile, params.buffer, function (err) {
        if (err) {
          reject(err)
        } else {
          // prepare payload
          var filedata = null
          switch (params.type) {
            case 'image':
              filedata = {
                value: fs.createReadStream(tmpFile),
                options: {
                  filename: params.filename,
                  contentType: 'image/png' // fix extension
                }
              }
              break
            case 'audio':
              filedata = {
                value: fs.createReadStream(tmpFile),
                options: {
                  filename: params.filename,
                  contentType: 'audio/mp3'
                }
              }
              break
            case 'file':
              filedata = {
                value: fs.createReadStream(tmpFile),
                options: {
                  filename: params.filename,
                  contentType: params.mimeType
                }
              }
          }
          // upload and send
          var formData = {
            recipient: '{"id":"' + params.recipient + '"}',
            message: '{"attachment":{"type":"' + params.type + '", "payload":{}}}',
            filedata: filedata
          }
          request.post({
            url: 'https://graph.facebook.com/v2.6/me/messages?access_token=' + params.token,
            formData: formData
          }, function (err) {
            if (err) {
              reject(err)
            } else {
              resolve()
            }
          })
        }
      }) // end writeFile
    })
  }

}