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

prisme platform flow engine

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

var _ = require('underscore')
var MessageTemplate = require('./lib/message-template.js')
var request = require('request').defaults({ encoding: null })
var utils = require('./lib/helpers/utils')

module.exports = function (RED) {
  function BotVoice (config) {
    RED.nodes.createNode(this, config)
    var node = this
    this.message = config.message
    this.language = config.language
    this.transports = ['telegram', 'facebook']

    this.on('input', function (msg) {
      var message = node.message
      var language = node.language
      var originalMessage = msg.originalMessage
      var chatId = msg.payload.chatId || (originalMessage && originalMessage.chat.id)
      var messageId = msg.payload.messageId || (originalMessage && originalMessage.message_id)
      var template = MessageTemplate(msg, node)

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

      if (!_.isEmpty(node.message)) {
        message = node.message
      } else if (_.isString(msg.payload) && !_.isEmpty(msg.payload)) {
        message = msg.payload
      } else {
        node.error('Empty message')
      }

      var parsedMessage = template(message)
      var voiceUrl = 'http://www.voicerss.org/controls/speech.ashx?' +
        'hl=' + language +
        '&src=' + encodeURI(parsedMessage) + '&c=mp3' +
        '&rnd=' + Math.random()

      request.get({
        url: voiceUrl,
        headers: {}
      }, function (err, response, buffer) {
        if (err) {
          node.error('Error contacting VoiceRSS')
        } else {
          msg.payload = {
            type: 'audio',
            content: buffer,
            filename: 'audio.mp3',
            chatId: chatId,
            messageId: messageId,
            inbound: false
          }
          node.send(msg)
        }
      })
    })
  }

  RED.nodes.registerType('bot-voice', BotVoice)
}