Sending a notification message to Telegram (via cURL)

readme.md

1. Create a bot
2. Gets its API token (via @BotFather)
3. Get the ID of the chat
   1. Add your bot to the chat
   2. Fetch bot updates and look for the chat id:

      curl https://api.telegram.org/bot$TELEGRAM_BOT_TOKEN/getUpdates | jq .message.chat.id
      

   3. OR, run bot.rb and @-mention your bot in the chat. The chat id will appear in bot.rb's output.
      The bot may need temporary message access: @BotFather > Bot Settings > Group Privacy > Turn off
4. Send a message via their HTTP API: https://core.telegram.org/bots/api#sendmessage

   curl -X POST \
        -H 'Content-Type: application/json' \
        -d '{"chat_id": "123456789", "text": "This is a test from curl", "disable_notification": true}' \
        https://api.telegram.org/bot$TELEGRAM_BOT_TOKEN/sendMessage

bot.rb

# Use this script to test that your Telegram bot works.
#
# Install the dependency
#
#   $ gem install telegram_bot
#
# Run the bot
#
#   $ ruby bot.rb
#
# Send a message to the bot to get the current chat's ID in the console output.
# If it's a group chat, invite them to the chat first.

require 'logger'
require 'telegram_bot'

TELEGRAM_BOT_TOKEN = "YOUR_BOT_API_TOKEN"

bot = TelegramBot.new(token: TELEGRAM_BOT_TOKEN, logger: Logger.new(STDOUT))

bot.get_updates(fail_silently: true) do |message|
  puts "@#{message.from.username}: #{message.text}"
  puts "Chat-ID: #{message.chat.id}"
end