prisme-flow/nodes/bridge/bot/bot-image.js

prisme platform flow engine

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

var _ = require('underscore')
var fs = require('fs')
var Path = require('path')
var sanitize = require('sanitize-filename')
var utils = require('./lib/helpers/utils')

module.exports = function (RED) {
  function BotImage (config) {
    RED.nodes.createNode(this, config)
    var node = this
    this.filename = config.filename
    this.name = config.name
    this.caption = config.caption
    this.transports = ['telegram', 'slack', 'facebook', 'smooch']

    this.on('input', function (msg) {
      var path = node.filename
      var name = node.name
      var chatId = utils.getChatId(msg)
      var messageId = utils.getMessageId(msg)
      var content = null

      // check transport compatibility
      if (!utils.matchTransport(node, msg)) {
        return
      }

      if (!_.isEmpty(path)) {
        content = fs.readFileSync(path)
      } else if (msg.payload instanceof Buffer) {
        content = msg.payload
      } else if (_.isObject(msg.payload) && msg.payload.image instanceof Buffer) {
        content = msg.payload.image
      }

      // get filename
      var filename = 'image'
      if (!_.isEmpty(path)) {
        filename = Path.basename(path)
      } else if (!_.isEmpty(name)) {
        filename = sanitize(name)
      }

      var caption = null
      if (!_.isEmpty(node.caption)) {
        caption = node.caption
      } else if (_.isObject(msg.payload) && _.isString(msg.payload.caption) && !_.isEmpty(msg.payload.caption)) {
        caption = msg.payload.caption
      }

      // send out the message
      msg.payload = {
        type: 'photo',
        content: content,
        filename: filename,
        caption: caption,
        chatId: chatId,
        messageId: messageId,
        inbound: false
      }

      // send out reply
      node.send(msg)
    })
  }

  RED.nodes.registerType('bot-image', BotImage)
}