node-red-contrib-chatbot/nodes/chatbot-voice.js

REDBot a Chat bot for a full featured chat bot for Telegram, Facebook Messenger and Slack. Almost no coding skills required

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

module.exports = function(RED) {

  function ChatBotVoice(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');
      }

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

          request.get({
            url: voiceUrl,
            headers: {
              'Referer': 'http://www.voicerss.org/api/demo.aspx'
            }
          }, 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('chatbot-voice', ChatBotVoice);
};