Merge pull request #11 from LeddaZ/master

Add Telegram support for notifications

Author: ddries

README.md

@@ -144,6 +144,7 @@ $ crontab -e # set cronjob to run periodically
 
 d2c.sh by default does not use any notification service, but the following are supported and can be enabled:
 - [Gotify](https://gotify.net/)
+- [Telegram Bot API](https://core.telegram.org/api/bots)
 - ...
 
 When DNS records are updated, d2c.sh will send a notification to enabled services. Feel free to submit a pull request to add more notification services.
@@ -158,3 +159,20 @@ enabled = true
 endpoint = "http://gotify.example.com"
 token = "ccc"
 ```
+
+#### 2. Telegram
+
+To enable notifications via Telegram bot, add the following configuration to your `toml` file:
+
+```toml
+[telegram]
+enabled = true
+token = "aaabbb" # from BotFather
+chat_id = "111234"
+```
+
+You can get your chat ID by sending a message to the bot and going to this URL to view the chat_id:
+
+`https://api.telegram.org/botYOUR_BOT_TOKEN/getUpdates`
+
+

d2c.sh

@@ -83,6 +83,11 @@ for config_file in $(ls ${config_file_dir}*.toml 2>/dev/null | sort -V); do
     gotify_endpoint=$(yq '.gotify.endpoint' ${config_file})
     gotify_token=$(yq '.gotify.token' ${config_file})
 
+    # read telegram config
+    telegram_enabled=$(yq '.telegram.enabled' ${config_file})
+    telegram_token=$(yq '.telegram.token' ${config_file})
+    telegram_chat_id=$(yq '.telegram.chat_id' ${config_file})
+
     # get records from Cloudflare
     existing_records_raw=$(curl --silent --request GET \
         --url ${cloudflare_base}/zones/${zone_id}/dns_records \
@@ -141,7 +146,17 @@ for config_file in $(ls ${config_file_dir}*.toml 2>/dev/null | sort -V); do
                         status_code=$(curl --silent --output /dev/null --write-out "%{http_code}" "${gotify_endpoint}/message?token=${gotify_token}" -F "title=[d2c.sh] ${name} has changed" -F "message=Public IP for ${name} has changed (${public_ip})" -F "priority=5")
 
                         if [[ "$status_code" -ne 200 ]]; then
-                            echo "[d2c.sh] Failed to sent Gotify notification"
+                            echo "[d2c.sh] Failed to send Gotify notification"
+                        fi
+                    fi
+
+                    # check if Telegram is enabled
+                    if [ "$telegram_enabled" = true ]; then
+                        # send changed ip notification
+                        status_code=$(curl --silent --output /dev/null --write-out "%{http_code}" https://api.telegram.org/bot"${telegram_token}"/sendMessage -d chat_id="${telegram_chat_id}" -d disable_web_page_preview=true -d text="[d2c.sh] Public IP for ${name} has changed (${public_ip})")
+
+                        if [[ "$status_code" -ne 200 ]]; then
+                            echo "[d2c.sh] Failed to send Telegram notification"
                         fi
                     fi
                 else