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app.js
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app.js
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/**
* 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 express = require('express'); // app server
var bodyParser = require('body-parser'); // parser for post requests
var Conversation = require('watson-developer-cloud/conversation/v1'); // watson sdk
var app = express();
// Bootstrap application settings
app.use(express.static('./public')); // load UI from public folder
app.use(bodyParser.json());
// Create the service wrapper
var conversation = new Conversation({
// If unspecified here, the CONVERSATION_USERNAME and CONVERSATION_PASSWORD env properties will be checked
// After that, the SDK will fall back to the bluemix-provided VCAP_SERVICES environment property
//'username': process.env.CONVERSATION_USERNAME,
//'password': process.env.CONVERSATION_PASSWORD,
'version_date': Conversation.VERSION_DATE_2017_04_21
});
// Endpoint to be call from the client side
app.post('/api/message', function(req, res) {
var workspace = process.env.WORKSPACE_ID || '<workspace-id>';
if (!workspace || workspace === '<workspace-id>') {
return res.json({
'output': {
'text': 'The app has not been configured with a <b>WORKSPACE_ID</b> environment variable. Please refer to the ' + '<a href="https://github.com/watson-developer-cloud/conversation-simple">README</a> documentation on how to set this variable. <br>' + 'Once a workspace has been defined the intents may be imported from ' + '<a href="https://github.com/watson-developer-cloud/conversation-simple/blob/master/training/car_workspace.json">here</a> in order to get a working application.'
}
});
}
var payload = {
workspace_id: workspace,
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;