Feat: email notifications (#3007)

* Feat: email notifications / email db backup

Because not using a simple smtp connection is silly

* Added form

* broken, and annoying bug

Why wont the input display?!?!?

* make

* Encourage protonmail use, because its great.

* feat: small UI polishing

* chore: make bundle

---------

Co-authored-by: Vlad Stan <stan.v.vlad@gmail.com>

lnbits/core/services/notifications.py

@@ -1,5 +1,8 @@
 import asyncio
 import json
+import smtplib
+from email.mime.multipart import MIMEMultipart
+from email.mime.text import MIMEText
 from http import HTTPStatus
 from typing import Optional, Tuple
 
@@ -62,6 +65,12 @@ async def send_notification(
             logger.debug(f"Sent nostr notification: {message_type}")
     except Exception as e:
         logger.error(f"Error sending nostr notification {message_type}: {e}")
+    try:
+        if settings.lnbits_email_notifications_enabled:
+            await send_email_notification(message)
+            logger.debug(f"Sent email notification: {message_type}")
+    except Exception as e:
+        logger.error(f"Error sending email notification {message_type}: {e}")
 
 
 async def send_nostr_notification(message: str) -> dict:
@@ -102,6 +111,43 @@ async def send_telegram_message(token: str, chat_id: str, message: str) -> dict:
         return response.json()
 
 
+async def send_email_notification(message: str) -> dict:
+    await send_email(
+        settings.lnbits_email_notifications_server,
+        settings.lnbits_email_notifications_port,
+        settings.lnbits_email_notifications_password,
+        settings.lnbits_email_notifications_email,
+        settings.lnbits_email_notifications_to_emails,
+        "LNbits Notification",
+        message,
+    )
+    return {"status": "ok"}
+
+
+async def send_email(
+    server: str,
+    port: int,
+    password: str,
+    from_email: str,
+    to_emails: list,
+    subject: str,
+    message: str,
+):
+    msg = MIMEMultipart()
+    msg["From"] = from_email
+    msg["To"] = ", ".join(to_emails)
+    msg["Subject"] = subject
+    msg.attach(MIMEText(message, "plain"))
+    try:
+        with smtplib.SMTP(server, port) as smtp_server:
+            smtp_server.starttls()
+            smtp_server.login(from_email, password)
+            smtp_server.sendmail(from_email, to_emails, msg.as_string())
+            logger.debug(f"Emails sent successfully to: {', '.join(to_emails)}")
+    except Exception as e:
+        logger.debug(f"Failed to send email: {e}")
+
+
 def is_message_type_enabled(message_type: NotificationType) -> bool:
     if message_type == NotificationType.balance_update:
         return settings.lnbits_notification_credit_debit