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';

const express = require('express');
const app = express();
const LanguageTranslatorV3 = require('ibm-watson/language-translator/v3');
const { IamAuthenticator } = require('ibm-watson/auth');

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

// Create the service wrapper
const translator = new LanguageTranslatorV3({
  version: '2019-10-10',
  authenticator: new IamAuthenticator({
    apikey: process.env.LANGUAGE_TRANSLATOR_IAM_APIKEY,
  }),
  url: process.env.LANGUAGE_TRANSLATOR_URL,
  headers: {
    'X-Watson-Technology-Preview': '2018-05-01',
    'X-Watson-Learning-Opt-Out': true,
  },
});

// render index page
app.get('/', function(req, res) {
  // If hide_header is found in the query string and is set to 1 or true,
  // the header should be hidden. Default is to show header
  res.render('index', {
    hideHeader: !!(req.query.hide_header == 'true' || req.query.hide_header == '1'),
  });
});

app.get('/api/models', function(req, res, next) {
  console.log('/v3/models');
  translator
    .listModels()
    .then(({ result }) => res.json(result))
    .catch(error => next(error));
});

app.post('/api/identify', function(req, res, next) {
  console.log('/v3/identify');
  translator
    .identify(req.body)
    .then(({ result }) => res.json(result))
    .catch(error => next(error));
});

app.get('/api/identifiable_languages', function(req, res, next) {
  console.log('/v3/identifiable_languages');
  translator
    .listIdentifiableLanguages(req.body)
    .then(({ result }) => res.json(result))
    .catch(error => next(error));
});

app.post('/api/translate', function(req, res, next) {
  console.log('/v3/translate');
  translator
    .translate(req.body)
    .then(({ result }) => res.json(result))
    .catch(error => next(error));
});

// express error handler
require('./config/error-handler')(app);
module.exports = app;