Ruby and Telegram Bots

I’ve decided to implement Telegram notifications into one of my pet project - Evendy.ru.

After some googling I’ve found great gem https://github.com/telegram-bot-rb/telegram-bot, gem is actively maintained and have great documentation.

So, if you want to implement Telegram messages into some channel you need to follow this simple easy steps:

1) Create new bot using @BotFather bot, and get secret token.

2) Create Telegram channel from your Telegram client, and add new bot as Administrator.

3) Create config/initializers/telegram.rb

TELEGRAM_API_KEY = 'YOUR_BOT_TOKEN'

4) Just send message to your public channel:

bot = Telegram::Bot::Client.new(TELEGRAM_API_KEY)
bot.send_message(chat_id: "@#{YOUR_CHANNEL_NAME}", text: 'YOUR_TEXT')

If you want you can add more custom commands with overriding default controller with custom:

class TelegramWebhooksController < Telegram::Bot::UpdatesController
  include Telegram::Bot::UpdatesController::MessageContext
  context_to_action!
end  

And add to your routes.rb:

telegram_webhooks TelegramWebhooksController

Some example bot action:

def send_message(message, parse_mode = :HTML)
  respond_with :message, text: message, parse_mode: parse_mode
end

def events
  send_message(Event.actual.all.map { |event| "<b>[#{event.id}] #{event.title}</b>" }.join("\n"))
end

More: telegram-bot gem

Example bot usage: