dockcheck/notify_templates/notify_telegram.sh

### DISCLAIMER: This is a third party addition to dockcheck - best effort testing.
NOTIFY_TELEGRAM_VERSION="v0.2"
#
# Required receiving services must already be set up.
# Do not modify this file directly. Set TELEGRAM_CHAT_ID and TELEGRAM_TOKEN in your dockcheck.config file.

if [[ -z "${TELEGRAM_CHAT_ID:-}" ]] || [[ -z "${TELEGRAM_TOKEN:-}" ]]; then
  printf "Telegram notification channel enabled, but required configuration variables are missing. Telegram notifications will not be sent.\n"

  remove_channel telegram
fi

trigger_telegram_notification() {
  if [[ "$PrintMarkdownURL" == true ]]; then
      ParseMode="Markdown"
  else
      ParseMode="HTML"
  fi

  TelegramToken="${TELEGRAM_TOKEN}" # e.g. TELEGRAM_TOKEN=token-value
  TelegramChatId="${TELEGRAM_CHAT_ID}" # e.g. TELEGRAM_CHAT_ID=mychatid
  TelegramUrl="https://api.telegram.org/bot$TelegramToken"
  TelegramTopicID=${TELEGRAM_TOPIC_ID:="0"}
  TelegramData="{\"chat_id\":\"$TelegramChatId\",\"text\":\"$MessageBody\",\"message_thread_id\":\"$TelegramTopicID\",\"disable_notification\": false}"

  curl -sS -o /dev/null --fail -X POST "$TelegramUrl/sendMessage" -H 'Content-Type: application/json' -d "$TelegramData"
}