app.js

/**
 * Copyright 2015 IBM Corp. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict';

var WatsonConversationSetup = require('./lib/watson-conversation-setup');
var DEFAULT_NAME = 'watson-conversation-slots-intro';
var fs = require('fs'); // file system for loading JSON
var vcapServices = require('vcap_services');
var conversationCredentials = vcapServices.getCredentials('conversation');
var watson = require('watson-developer-cloud'); // watson sdk

var express = require('express'); // app server
var bodyParser = require('body-parser'); // parser for post requests

var app = express();

require('metrics-tracker-client').track();

// Bootstrap application settings
app.use(express.static('./public')); // load UI from public folder
app.use(bodyParser.json());

var workspaceID; // workspaceID will be set when the workspace is created or validated.

// Create the service wrapper
var conversation = watson.conversation({
  url: conversationCredentials.url,
  username: conversationCredentials.username,
  password: conversationCredentials.password,
  version_date: '2016-07-11',
  version: 'v1'
});

var conversationSetup = new WatsonConversationSetup(conversation);
var workspaceJson = JSON.parse(fs.readFileSync('data/watson-pizzeria.json'));
var conversationSetupParams = { default_name: DEFAULT_NAME, workspace_json: workspaceJson };
conversationSetup.setupConversationWorkspace(conversationSetupParams, (err, data) => {
  if (err) {
    //handleSetupError(err);
  } else {
    console.log('Conversation is ready!');
    workspaceID = data;
  }
});

// Endpoint to be call from the client side
app.post('/api/message', function(req, res) {

  if (!workspaceID) {
    return res.json({
      output: {
        text: 'Conversation initialization in progress. Please try again.'
      }
    });
  }

  var payload = {
    workspace_id: workspaceID,
    context: req.body.context || {},
    input: req.body.input || {}
  };

  // Send the input to the conversation service
  conversation.message(payload, function(err, data) {
    if (err) {
      return res.status(err.code || 500).json(err);
    }
    return res.json(updateMessage(payload, data));
  });
});

/**
 * Updates the response text using the intent confidence
 * @param  {Object} input The request to the Conversation service
 * @param  {Object} response The response from the Conversation service
 * @return {Object}          The response with the updated message
 */
function updateMessage(input, response) {
  var responseText = null;
  if (!response.output) {
    response.output = {};
  } else {
    return response;
  }
  if (response.intents && response.intents[0]) {
    var intent = response.intents[0];
    // Depending on the confidence of the response the app can return different messages.
    // The confidence will vary depending on how well the system is trained. The service will always try to assign
    // a class/intent to the input. If the confidence is low, then it suggests the service is unsure of the
    // user's intent . In these cases it is usually best to return a disambiguation message
    // ('I did not understand your intent, please rephrase your question', etc..)
    if (intent.confidence >= 0.75) {
      responseText = 'I understood your intent was ' + intent.intent;
    } else if (intent.confidence >= 0.5) {
      responseText = 'I think your intent was ' + intent.intent;
    } else {
      responseText = 'I did not understand your intent';
    }
  }
  response.output.text = responseText;
  return response;
}

module.exports = app;