Botkit Middleware for multilingual projects with Wit.ai

Unleash the power of Wit.ai's Natural Language Processing to your Botkit bot with this middleware. All incoming text messages (by default it filters payload derived from Facebook Messenger buttons like Quick Replies and Postbacks) will go through Wit.ai's API to extract useful entities that will be added to the message object so they can be used in the controller.

Installation

In order to utilize wit.ai's service you will need to create an account at Wit.ai and a Wit.ai app for each language. Grab the access tokens at Settings as shown below:

Next you will need to add botkit-witai as a dependency to your Botkit bot:

npm install --save botkit-witai-multiligual

Enable the middleware with the following options:

• tokens - (required) Tokens to use Wit.ai API
• minConfidence - (optional) Minimum Wit.ai's entities confidence value to be considered. Valid value range is from 0.1 to 1. 0.5 is the default.
• logLevel - (optional) Log level for the middleware. Valid values are: 'debug', 'info', 'warning', 'error'.

** Works only with Facebook bots and requires botkit-middleware-fbuser **

Example:

var fbuser = require('botkit-middleware-fbuser')({
    accessToken:'<fb_access_token>',
    fields: ['first_name', 'last_name', 'locale', 'profile_pic','timezone','gender','is_payment_enabled'],
    logLevel:'error'
});

var wit = require('botkit-witai-multilingual')({
    tokens:{
     default: '<witai_default_app_token>',
     fr_CA: '<witai_fr_CA_app_token>'
    },
    minConfidence: 0.6,
    logLevel: 'error'
});

controller.middleware.receive.use(fbuser.receive)
controller.middleware.receive.use(wit.receive);

Usage

You will receive in the callback of the controller.hears the Wit.ai's entities defined in your panel as shown below that match the message received:

Example:

controller.hears(['spa'], 'message_received', wit.hears, function (bot, message) {
      console.log("Wit.ai detected entities", message.entities);
      //Example message: "I want a spa treatment"
      //    {
      //      "spa": [
      //        {
      //          "confidence": 1,
      //          "type": "value",
      //          "value": "spa"
      //        }
      //      ]
      //    }

      //Your code here
});

##Roadmap

• Wit.ai's conversation actions linked to Botkit's conversation steps.
• Functional testing coverage.

##Author Rafael Casuso

Github: @RafaelCasuso

Twitter: @Rafael_Casuso