index.js

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

// index.js is used to setup and configure your bot

// Import required packages.
const path = require('path');
const restify = require('restify');
const { MicrosoftTranslator } = require('./translation/microsoftTranslator');
const { TranslatorMiddleware } = require('./translation/translatorMiddleware');

// Import required bot services. See https://aka.ms/bot-services to learn more about the different parts of a bot.
const { BotFrameworkAdapter, MemoryStorage, UserState } = require('botbuilder');

// This bot's main dialog.
const { MultilingualBot } = require('./bots/multilingualBot');

// Note: Ensure you have a .env file and include translatorKey.
const ENV_FILE = path.join(__dirname, '.env');
require('dotenv').config({ path: ENV_FILE });

// Used to create the BotStatePropertyAccessor for storing the user's language preference.
const LANGUAGE_PREFERENCE = 'language_preference';

// Create adapter. See https://aka.ms/about-bot-adapter to learn more about adapters.
const adapter = new BotFrameworkAdapter({
    appId: process.env.MicrosoftAppId,
    appPassword: process.env.MicrosoftAppPassword
});

// Catch-all for errors.
adapter.onTurnError = async (context, error) => {
    // This check writes out errors to console log.
    // NOTE: In production environment, you should consider logging this to Azure
    //       application insights.
    console.error(`\n [onTurnError]: ${ error }`);
    // Send a message to the user.
    await context.sendActivity(`Oops. Something went wrong!`);
};

// Define a state store for your bot. See https://aka.ms/about-bot-state to learn more about using MemoryStorage.
// A bot requires a state store to persist the dialog and user state between messages.

// For local development, in-memory storage is used.
// CAUTION: The Memory Storage used here is for local bot debugging only. When the bot
// is restarted, everything stored in memory will be gone.
const memoryStorage = new MemoryStorage();
const userState = new UserState(memoryStorage);

const languagePreferenceProperty = userState.createProperty(LANGUAGE_PREFERENCE);

// Pass in a logger to the bot. For this sample, the logger is the console, but alternatives such as Application Insights and Event Hub exist for storing the logs of the bot.
const logger = console;

const translator = new MicrosoftTranslator(process.env.translatorKey);
adapter.use(new TranslatorMiddleware(translator, languagePreferenceProperty));

// Create the MultilingualBot.
const bot = new MultilingualBot(userState, languagePreferenceProperty, logger);

// Create HTTP server.
let server = restify.createServer();
server.listen(process.env.port || process.env.PORT || 3978, function() {
    console.log(`\n${ server.name } listening to ${ server.url }.`);
    console.log(`\nGet Bot Framework Emulator: https://aka.ms/botframework-emulator.`);
});

// Listen for incoming activities and route them to your bot main dialog.
server.post('/api/messages', (req, res) => {
    // Route received a request to adapter for processing.
    adapter.processActivity(req, res, async (context) => {
        // Route to bot activity handler.
        await bot.run(context);
    });
});