Add telegram bot functionality

Dockerfile

@@ -1,6 +1,6 @@
 FROM alpine
 
-RUN apk update && apk add openssl openssh
+RUN apk update && apk add openssl openssh curl
 
 COPY backup.sh .
 

README.md

@@ -8,6 +8,8 @@ docker run \
     -v /path/to/output:/output \
     -v /path/to/key1.pub:/keys/key1.pub:ro \
     -v /path/to/key2.pub:/keys/key2.pub:ro \
+    -e TELEGRAM_BOT_TOKEN=verysecretbottoken \
+    -e TELEGRAM_CHAT_IDS=1337,42069,-12345 \
     backupinator
 ```
 

backup.sh

@@ -25,3 +25,24 @@ for keyfile in $(ls /keys); do
     rm $tmpkey
 done
 
+if [ ! -z ${TELEGRAM_BOT_TOKEN+x} ]; then
+    echo $TELEGRAM_CHAT_IDS | sed -n 1'p' | tr ',' '\n' | while read chat_id; do 
+        echo "sending messages to $chat_id..."
+        curl -X POST "https://api.telegram.org/bot$TELEGRAM_BOT_TOKEN/sendMessage" \
+             -F chat_id="$chat_id" \
+             -F text="Backup time."
+        echo ""
+
+        curl -X POST "https://api.telegram.org/bot$TELEGRAM_BOT_TOKEN/sendDocument" \
+             -F chat_id="$chat_id" \
+             -F document=@/out/backup.tar.gz.enc
+        echo ""
+
+        for keyfile in $(ls /out/key-*); do
+            curl -X POST "https://api.telegram.org/bot$TELEGRAM_BOT_TOKEN/sendDocument" \
+                 -F chat_id="$chat_id" \
+                 -F document="@$keyfile"
+            echo ""
+         done
+    done
+fi