Telegram and SMS notifier module

notify.ts

import fetch from 'node-fetch';
import twilio from 'twilio';

const {
  NOTIFICATION_PREFIX,
  TELEGRAM_CHAT_ID,
  TWILIO_ACCOUNT_SID,
  TWILIO_FROM_NUMBER,
  TWILIO_TO_NUMBER
} = require('../../../config');

let twilioClient = null;
try {
  twilioClient = twilio(TWILIO_ACCOUNT_SID, process.env.TWILIO_AUTH_TOKEN);
} catch (error) {
  console.error(error);
}

export enum NotificationService {
  Telegram = 'telegram',
  SMS = 'sms'
}

export enum NotificationType {
  Default = 'default',
  Error = 'error',
  Warning = 'warning',
  Success = 'success'
}

interface MessagePrefixMap {
  [key: string]: string;
}
const messagePrefix: MessagePrefixMap = {};
messagePrefix[NotificationType.Default] = 'ℹ️ ';
messagePrefix[NotificationType.Error] = '❌ ';
messagePrefix[NotificationType.Warning] = '⚠️ ';
messagePrefix[NotificationType.Success] = '✅ ';

const getGlobalPrefix = (service: NotificationService): string =>
  service === NotificationService.Telegram
    ? `\`${NOTIFICATION_PREFIX || ''}\` `
    : `${NOTIFICATION_PREFIX || ''}: `;

const getPrefix = (
  notificationType: NotificationType,
  service: NotificationService
): string =>
  `${getGlobalPrefix(service)}${messagePrefix[notificationType] || ''}`;

const prefixMessage = (
  message: string,
  notificationType: NotificationType,
  service: NotificationService
): string => `${getPrefix(notificationType, service)}${message}`;

const sendTelegramMessage = (
  message: string,
  notificationType: NotificationType = NotificationType.Default
): void => {
  const url = `https://api.telegram.org/bot${
    process.env.TELEGRAM_BOT_TOKEN
  }/sendmessage?chat_id=${TELEGRAM_CHAT_ID}&parse_mode=markdown&text=${encodeURIComponent(
    prefixMessage(message, notificationType, NotificationService.Telegram)
  )}`;

  fetch(url)
    .then(result => result.json().catch((error: Error) => console.error(error)))
    .catch((error: Error) => console.error(error));
};

const sendSMSMessage = (
  message: string,
  notificationType: NotificationType = NotificationType.Default
): void => {
  if (!twilioClient) {
    return;
  }

  twilioClient.messages
    .create({
      from: TWILIO_FROM_NUMBER,
      body: prefixMessage(message, notificationType, NotificationService.SMS),
      to: TWILIO_TO_NUMBER
    })
    .catch(error => console.error(error));
};

/**
 * Send notification message
 * @param message Message to send
 * @param notificationType Type de notification
 */
const notify = (
  message: string,
  notificationType: NotificationType = NotificationType.Default
): void => {
  if (process.env.NODE_ENV === 'production') {
    /** Send Telegram message */
    sendTelegramMessage(message, notificationType);

    /** Send SMS */
    sendSMSMessage(message, notificationType);
  }
};

export default notify;