Docker TelegramBot

This Docker Image provides a TelegramBot which can fetch emails via IMAP and forward them or only their subjects to Telegram Chats.

Configuration

You will need an IMAP Mailserver (account), a Docker host and a TelegramBot token. Create the last using the BotFather.

The IMAP account should have multiple email addresses, so the TelegramBot can handle multiple Telegram Chats as destination for the mails.

1. Create the IMAP account.
2. Prepare the Docker container.
   1. Copy the docker-compose.yml and fill in the details.
   2. Copy the rules.php and fill with rules.
   3. Add the log folder, if you want to.
      • set the rights using docker exec -it --user root telegram_mail chown -R php:php /home/php/telegram/log
3. Start the docker container, e.g. docker-compose up -d.
4. Test the setup, send a Mail to the IMAP account covered by a rule.
   1. Call curl 172.19.198.8 from the host, the container should answer OK.
   2. The Telegram message should arrive.
5. Make sure to notify the container about new emails, e.g.:
   1. Use a cronjob and call every x minutes.
   2. Use incron and monitor the IMAP (Dovecot) folder for the user -- use IN_MOVED_TO.
   3. Use a Postfix Filter to call the script.
   4. ...

TelegramBot Rules

The rules.php which should be mapped into the container at /home/php/telegram/rules.php. You may use the :ro flag.

• RULES::TELEGRAM is an array and defines the email address which receives the emails and the telegram chat, where the mails are send to.
  • mailto the user-part of the email (@SYSDOMAIN will be appended).
  • tag a tag to name the mails in the telegram chats
  • telto an array of telegram users (first send a message to the bot and the see the id at docker exec -it telegram_mail php ./telegram_info.php)
• RULES::MAILOVERVIEW is an array and defines the email address which receives the emails and the telegram chat, where reports about the subject of the mails are send to.
  • see at RULES::TELEGRAM

<?php
class RULES {
	//Telegram pushes, one array per rule
	const TELEGRAM = array(
		array(
			'mailto' => array( 'test'), // the addresses the mails goes to (only small letters, <part>@SYSDOMAIN)
			'tag' => '[TELEGRAM-TEST]', // TAG to be prepended to subject
			'telto' => array( '0000000' ) // the telegram chat, to send the mail to
		),
		// ....
	);
	//Mailoverview
	const MAILOVERVIEW = array(
		array(
			'mailto' => 'test', // the addresses the mails goes to (only small letters, <part>@SYSDOMAIN)
			'tag' => '[Overview-Test]', // TAG to be used as subject
			'telto' => array( '0000000' ) // the telegram chat, to send the mail to
		),
		// ...
	);
}
?>

Docker Compose

The docker-compose.yml to setup the Docker Image.

• TELEGRAM_API_TOKEN The TelegramBot token created by the BotFather.
• MAIL_SERVER The IMAP server in PHP notation, e.g. {localhost:993/imap/ssl}INBOX
• MAIL_USER The username for the IMAP account.
• MAIL_PW The password for the IMAP account.
• SYSDOMAIN The domain wich will be appended to the mailto parts in the rules.
• DELETMAILS Should the mails be deleted? true, false (If using false mails will be forwarded forever.)

services:
  telebot:
    image: kimbtechnologies/telegrambot:latest
    container_name: telegram_mail
    volumes:
      - ./rules.php:/home/php/telegram/rules.php:ro # load the rules from outside, rules.php has to be placed on the host manually.
      # - ./log/:/home/php/telegram/log # place the logs outside of the container, make sure php has the right to write the files
    restart: always
    environment:
      - TELEGRAM_API_TOKEN=tbf
      - MAIL_SERVER=tbf
      - MAIL_USER=tbf
      - MAIL_PW=tbf
      - SYSDOMAIN=tbf
      - DELETMAILS=tbf
    networks:
      telegram:
       ipv4_address: 172.19.198.8
    restart: always

networks:
  telegram:
    driver: bridge
    ipam:
      driver: default
      config:
        -
          subnet: 172.19.198.0/24

New Mail Script

The script which runs the bot and should be called on new mails. (It just does a HTTP request to the container, the container will do the rest.)

#!/bin/sh
curl -s 172.19.198.8 > /dev/null