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.
 */

const queryBuilder = require('./query-builder');

const DiscoveryV1 = require('watson-developer-cloud/discovery/v1');
const discovery = new DiscoveryV1({
  // If unspecified here, the DISCOVERY_USERNAME and
  // DISCOVERY_PASSWORD env properties will be checked
  // After that, the SDK will fall back to the bluemix-provided VCAP_SERVICES environment property
  // username: '<username>',
  // password: '<password>',
  version_date: '2016-11-09',
  qs: { aggregation: `[${queryBuilder.aggregations.join(',')}]` },
});

// gather news collection info
const NewsDemoApp = new Promise((resolve, reject) => {
  discovery.getEnvironments({}, (error, response) => {
    if (error) {
      console.error(error);
      reject(error);
    } else {
      const news_environment_id = response.environments.find((environment) => {
        return environment.read_only == true;
      }).environment_id;

      discovery.getCollections({
        environment_id: news_environment_id
      }, (error, response) => {
        if (error) {
          console.error(error);
          reject(error);
        } else {
          const news_collection_id = response.collections[0].collection_id;

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

          app.get('/', (req, res) => {
            res.render('index', {
              BLUEMIX_ANALYTICS: process.env.BLUEMIX_ANALYTICS,
            });
          });
          // setup query endpoint for news
          app.post('/api/query', (req, res, next) => {
            const params = Object.assign({}, queryBuilder.build(req.body), {
              environment_id: news_environment_id,
              collection_id: news_collection_id
            });

            discovery.query(params, (error, response) => {
              if (error) {
                next(error);
              } else {
                res.json(response);
              }
            });
          });

          // error-handler settings for all other routes
          require('./config/error-handler')(app);
          resolve(app);
        }
      });
    }
  });
});

module.exports = NewsDemoApp;