telegram-send.sh

#!/bin/bash

source /etc/telegram/telegram.conf

if [ -z "$BOT_TOKEN" ] || [ -z "$CHAT_ID" ]; then
  echo "Error: BOT_TOKEN and CHAT_ID must be set in /etc/telegram/telegram.conf"
  exit 1
fi

# Function to send a message to Telegram
send_telegram_message() {
  local message="$1"

  # If message is too long (ie > 2048 characters), send it as a file instead

  if [ ${#message} -lt 2048 ]; then
  curl -s -X POST "https://api.telegram.org/bot$BOT_TOKEN/sendMessage" \
      -d "chat_id=$CHAT_ID&text=$message" -o /dev/null
  else
    echo "$message" | curl -s -X POST "https://api.telegram.org/bot$BOT_TOKEN/sendDocument" \
      -F "chat_id=$CHAT_ID" \
      -F "document=@-;filename=message.txt" -o /dev/null
  fi
}

show_chat_id() {
  curl -s "https://api.telegram.org/bot$BOT_TOKEN/getUpdates" | jq -r '.result[] | .message.chat.id'
}

# Main execution
if [ "$1" == "-" ]; then
  message=$(cat)
else
  message="$1"
fi

send_telegram_message "$message"