app.js

/**
 * Copyright 2014 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 = express(),
  bluemix = require('./config/bluemix'),
  watson = require('watson-developer-cloud'),
  extend = require('util')._extend;

// Bootstrap application settings
require('./config/express')(app);

// if bluemix credentials exists, then override local
var credentials = extend({
  version: 'v1',
  username: '<username>',
  password: '<password>'
}, bluemix.getServiceCreds('concept_insights')); // VCAP_SERVICES

// Create the service wrapper
var conceptInsights = watson.concept_insights(credentials);

app.get('/', function(req, res){
    res.render('index');
});

app.get('/label_search', function (req, res) {
  var payload = extend({
    func:'labelSearch',
    limit: 4,
    prefix:true,
    concepts:true,
  }, req.query);

  conceptInsights.labelSearch(payload, function(error, result) {
    if (error)
      return res.status(error.error ? error.error.code || 500 : 500).json(error);
    else
      return res.json(result);
  });
});

app.get('/semantic_search', function (req, res) {
  var payload = extend({
    func:'semanticSearch',
  }, req.query);

  // ids needs to be stringify
  payload.ids = JSON.stringify(payload.ids);

  conceptInsights.semanticSearch(payload, function(error, result) {
    if (error)
      return res.status(error.error ? error.error.code || 500 : 500).json(error);
    else
      return res.json(result);
  });
});

var port = process.env.VCAP_APP_PORT || 3000;
app.listen(port);
console.log('listening at:', port);