チャットボット: Azure ポータルで生成されるボットのテンプレートコードを解読＆リファクタしてみる

// .env ファイルの設定を環境変数 (process.env) とマージし、
// .bot ファイルを読み込むための情報（パスなど）を返す。
function loadEnvFile() {
  const dotenv = require('dotenv');
  const path = require('path');
  const ROOT_DIR = __dirname;

  // Read .env file and merge info to process.env
  dotenv.config({ path: path.join(ROOT_DIR, '.env') });

  return {
    // Absolute path of .bot file
    botFilePath: path.join(ROOT_DIR, (process.env.botFilePath || '')),
    // Secret key of .bot file
    botFileSecret: process.env.botFileSecret,
    // Name of the endpoint configuration section from the .bot file
    botEnv: process.env.NODE_ENV || 'development',
  }
}

// 暗号化された .bot ファイルを読み込み、
// 指定されたエンドポイント (developement や production) の設定情報を返す。
function loadBotFile(env) {
  const { BotConfiguration } = require('botframework-config');

  let botConfig;
  try {
      // Read bot configuration from .bot file.
      botConfig = BotConfiguration.loadSync(env.botFilePath, env.botFileSecret);
  } catch (err) {
      console.error(`\nError reading bot file. Please ensure you have valid botFilePath and botFileSecret set for your environment.`);
      console.error(`\n - You can find the botFilePath and botFileSecret in the Azure App Service application settings.`);
      console.error(`\n - If you are running this bot locally, consider adding a .env file with botFilePath and botFileSecret.`);
      console.error(`\n - See https://aka.ms/about-bot-file to learn more about .bot file its use and bot configuration.\n\n`);
      process.exit();
  }

  // Get bot endpoint configuration by service name (such as "development" and "production")
  const endpointConfig = botConfig.findServiceByNameOrId(env.botEnv);

  return {
    appId: endpointConfig.appId || process.env.microsoftAppID,
    appPassword: endpointConfig.appPassword || process.env.microsoftAppPassword,
    channelService: process.env.ChannelService,
    openIdMetadata: process.env.BotOpenIdMetadata,
  }
}

const env = loadEnvFile();
module.exports = loadBotFile(env);

// ボットアダプターを生成する。
// Connector と Bot プログラムの橋渡し、認証処理などを行う。
function createBotAdapter(config) {
  // See https://aka.ms/about-bot-adapter to learn more about bot adapter.
  const { BotFrameworkAdapter } = require('botbuilder');
  const adapter = new BotFrameworkAdapter(config);

  // Catch-all for any unhandled errors in your bot.
  adapter.onTurnError = async (context, error) => {
      // This check writes out errors to console log .vs. app insights.
      console.error(`\n [onTurnError]: ${ error }`);
      // Send a message to the user
      await context.sendActivity(`Oops. Something went wrong!`);
  };

  return adapter;
}

// ボットサーバーを起動する
function startServer(adapter, bot) {
  const restify = require('restify');

  let server = restify.createServer();
  server.listen(process.env.port || process.env.PORT || 3978, function() {
    console.log(`\nBot server listening to ${ server.url }`);
  });

  // Listen for incoming activities and route them to your bot main dialog.
  server.post('/api/messages', (req, res) => {
    adapter.processActivity(req, res, async (context) => {
      await bot.onTurn(context);
    });
  });
}

// エントリポイント
(function main() {
  const config = require('./config.js');
  const adapter = createBotAdapter(config);
  const { Bot } = require('./bot.js');
  const bot = new Bot();
  startServer(adapter, bot);
})();

const { ActivityTypes } = require('botbuilder');

class Bot {
  async onTurn(turnContext) {
    const type = turnContext.activity.type;
    if (type === ActivityTypes.Message) {
      const text = turnContext.activity.text;
      await turnContext.sendActivity(`You said "${text}"`);
    } else {
      await turnContext.sendActivity(`[${type} event detected]`);
    }
  }
}

exports.Bot = Bot;

botFilePath=./maku-bot.bot
botFileSecret=9l/b88E/hiSpcIdxskqe4YSaE7sGSYXPaiuKZslE3XG=