migrate from gotify to ntfy with image attachment support

- Replace GotifyNotifier with NtfyNotifier for push notifications
- Add support for sending email image attachments to ntfy
- Add NTFY_URL, NTFY_TOKEN, NTFY_TOPIC environment variables
- Add get_mailpit_image() and get_mailpit_image_thumb() helpers
- Sanitize message content for HTTP headers (remove newlines)
- Remove all gotify references

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.env.example

@@ -8,6 +8,9 @@ MP_SMTP_TLS_KEY=sans:mailpit.local
 MP_WEBHOOK_URL=http://sneaky_mon_webhook:8088/hook
 
 # SNEAKYMON VARS
-GOTIFY_URL=https://yourgotify.server.com
-GOTIFY_TOKEN=YourTokenForGotify
 MAILPIT_API=http://mailpit:8025 # <-- this points to above, it can even be the IP if you want.
+
+# Ntfy notification service
+NTFY_URL=https://ntfy.sh
+NTFY_TOKEN=YourNtfyAccessToken
+NTFY_TOPIC=your-topic-name

CLAUDE.md

@@ -0,0 +1,68 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Sneaky Mon is an email-to-notification bridge that receives webhooks from Mailpit (local email service) and forwards emails as push notifications to Gotify or Ntfy. Designed for monitoring system-generated emails (e.g., IoT camera motion alerts) on secure internal networks.
+
+## Commands
+
+### Development
+```bash
+# Setup virtual environment
+python3 -m venv venv
+source venv/bin/activate
+pip install -r requirements.txt
+
+# Run Flask server (listens on 0.0.0.0:8088)
+python app/main.py
+
+# Test with hardcoded message ID
+python app/dev_main.py
+```
+
+### Docker
+```bash
+# Start services (Mailpit + webhook handler)
+docker-compose up -d
+
+# View logs
+docker-compose logs -f sneaky_mon_webhook
+
+# Build and push image
+./build_push_image.sh
+```
+
+## Architecture
+
+```
+Email Sources → Mailpit (SMTP:1025, API:8025) → Sneaky Mon (POST /hook) → Ntfy/Gotify
+```
+
+**Data Flow:**
+1. Email arrives at Mailpit SMTP
+2. Mailpit triggers webhook to `/hook` endpoint
+3. Flask app fetches full message from Mailpit API
+4. Extracts subject/content, creates notification
+5. Sends to Ntfy or Gotify
+
+## Key Files
+
+- `app/main.py` - Flask app with `/hook` webhook endpoint and core logic
+- `app/utils/gotify_api.py` - GotifyNotifier class for Gotify integration
+- `app/utils/ntfy_api.py` - NtfyNotifier class for Ntfy integration
+- `docker-compose.yaml` - Orchestrates Mailpit and webhook services
+
+## Configuration
+
+All configuration via environment variables (see `.env.example`):
+- `MAILPIT_API` / `MAILPIT_TOKEN` - Mailpit REST API access
+- `NTFY_URL` / `NTFY_TOKEN` / `NTFY_TOPIC` - Ntfy notification service (primary)
+- `GOTIFY_URL` / `GOTIFY_TOKEN` - Gotify notification service (legacy, optional)
+- `LOG_LEVEL` - Logging verbosity
+
+## Current State Notes
+
+- Project uses Ntfy for push notifications with image attachment support
+- Application intentionally lacks TLS/auth - designed for isolated internal VLANs

app/dev_main.py

@@ -5,5 +5,5 @@ load_dotenv()
 
 from main import handle_hook
 
-msg_id = "jtdx9og7NAQ6LuVvEmRL6t"
+msg_id = "42EJJktKsUUaH7zjQ6YoKY"
 handle_hook(msg_id)

app/main.py

@@ -24,8 +24,11 @@ load_dotenv()
 
 MAILPIT_API = os.getenv("MAILPIT_API", "http://localhost:8025")
 MAILPIT_TOKEN = os.getenv("MAILPIT_TOKEN", "")
-GOTIFY_URL = os.getenv("GOTIFY_URL","")
-GOTIFY_TOKEN = os.getenv("GOTIFY_TOKEN","")
+
+NTFY_URL = os.getenv("NTFY_URL", "")
+NTFY_TOKEN = os.getenv("NTFY_TOKEN", "")
+NTFY_TOPIC = os.getenv("NTFY_TOPIC", "")
+
 LOG_LEVEL = os.getenv("LOG_LEVEL", "INFO").upper()
 
 logging.basicConfig(
@@ -36,7 +39,7 @@ log = logging.getLogger("mailpit-hook")
 
 app = Flask(__name__)
 
-from utils.gotify_api import GotifyNotifier
+from utils.ntfy_api import NtfyNotifier
 
 # ------------------------------------------------------------------ #
 # Helpers
@@ -53,16 +56,46 @@ def get_mailpit_message(message_id: str) -> Dict[str, Any]:
     resp.raise_for_status()
     return resp.json()
 
+def get_mailpit_image_thumb(message_id: str, part_id: str) -> bytes:
+    """Retrieve image thumbnail from Mailpit REST API as binary data."""
+    url = f"{MAILPIT_API}/api/v1/message/{message_id}/part/{part_id}/thumb"
+    headers = {}
+    if MAILPIT_TOKEN:
+        headers["Authorization"] = f"Bearer {MAILPIT_TOKEN}"
 
-def send_gotify(title: str, message: str, priority: int = 5) -> None:
-    """Send a message to Gotify."""
-    notify = GotifyNotifier(GOTIFY_URL, GOTIFY_TOKEN)
+    resp = requests.get(url, headers=headers, timeout=10)
+    resp.raise_for_status()
+    return resp.content
 
-    result = notify.gotify(title=title,markdown=message,priority=5)
-    if not result:
-        log.warning("Gotify push failed")
+def get_mailpit_image(message_id: str, part_id: str) -> bytes:
+    """Retrieve image thumbnail from Mailpit REST API as binary data."""
+    url = f"{MAILPIT_API}/api/v1/message/{message_id}/part/{part_id}"
+    headers = {}
+    if MAILPIT_TOKEN:
+        headers["Authorization"] = f"Bearer {MAILPIT_TOKEN}"
+
+    resp = requests.get(url, headers=headers, timeout=10)
+    resp.raise_for_status()
+    return resp.content
+
+def send_notification(title: str, message: str, priority: int = 5,
+                      image_data: bytes = None, filename: str = "image.jpg") -> bool:
+    """Send a notification to Ntfy, optionally with an image attachment."""
+    notify = NtfyNotifier(NTFY_URL, NTFY_TOKEN, NTFY_TOPIC)
+
+    if image_data:
+        result = notify.send_with_image(
+            title=title, message=message, image_data=image_data,
+            filename=filename, priority=priority
+        )
     else:
-        log.info("Gotify push OK")
+        result = notify.send(title=title, message=message, priority=priority)
+
+    if not result:
+        log.warning("Ntfy push failed")
+    else:
+        log.info("Ntfy push OK")
+    return result
 
 
 # ------------------------------------------------------------------ #
@@ -97,16 +130,35 @@ def hook():
         return jsonify({"error":"Error sending webhook"}), 500
     
 
-def handle_hook(msg_id:str):
+def handle_hook(msg_id: str):
     try:
         msg = get_mailpit_message(msg_id)
         subject = msg.get("Subject", "(no subject)")
         text = msg.get("Text", "") or msg.get("HTML", "")
+        attachments = msg.get("Attachments") or []
+
+        # Build preview text
         preview = (text or "")
         if len(preview) > 200:
             preview = preview[:200] + "..."
 
-        send_gotify(subject, preview)
+        # Check for image attachments and fetch thumbnail
+        image_data = None
+        filename = "image.jpg"
+        if attachments:
+            first_attachment = attachments[0]
+            part_id = first_attachment.get("PartID")
+            content_type = first_attachment.get("ContentType", "")
+            if part_id and content_type.startswith("image/"):
+                try:
+                    # image_data = get_mailpit_image_thumb(msg_id, part_id)
+                    image_data = get_mailpit_image(msg_id, part_id)
+                    # Extract filename from attachment if available
+                    filename = first_attachment.get("FileName", "image.jpg")
+                except Exception as e:
+                    log.warning("Failed to fetch image thumbnail: %s", e)
+
+        send_notification(subject, preview, image_data=image_data, filename=filename)
         return True
 
     except Exception as e:
@@ -119,6 +171,4 @@ def handle_hook(msg_id:str):
 # ------------------------------------------------------------------ #
 
 if __name__ == "__main__":
-    # msg_id = "ZTUUK57e7kUoaviua6TCgP@mailpit"
-    # msg = get_mailpit_message(msg_id)
     app.run(host="0.0.0.0", port=8088)

app/utils/ntfy_api.py

@@ -0,0 +1,81 @@
+import requests
+
+
+class NtfyNotifier:
+
+    def __init__(self, server_url: str, api_token: str, topic: str):
+        self.base_url = server_url.rstrip('/')
+        self.token = api_token
+        self.topic = topic
+
+    def send(self, title: str = "Test", message: str = "testing msg", priority: int = 5) -> bool:
+        """
+        Send a text message to Ntfy.
+
+        Args:
+            title (str): Title of the notification.
+            message (str): Body of the notification.
+            priority (int, optional): Message priority (1-5). Defaults to 5.
+
+        Returns:
+            bool: True if the message was sent successfully, False otherwise.
+        """
+        if not self.base_url or not self.token or not self.topic:
+            print("[!] Missing NTFY_URL, NTFY_TOKEN, or NTFY_TOPIC")
+            return False
+
+        url = f"{self.base_url}/{self.topic}"
+
+        headers = {
+            "Authorization": f"Bearer {self.token}",
+            "Title": title,
+            "Priority": str(priority),
+        }
+
+        try:
+            response = requests.post(url, headers=headers, data=message, timeout=10)
+            response.raise_for_status()
+            return True
+        except requests.RequestException as e:
+            print(f"[!] Failed to send Ntfy message: {e}")
+            return False
+
+    def send_with_image(self, title: str, message: str, image_data: bytes,
+                        filename: str = "image.jpg", priority: int = 5) -> bool:
+        """
+        Send a notification with an attached image to Ntfy.
+
+        Args:
+            title (str): Title of the notification.
+            message (str): Body of the notification.
+            image_data (bytes): Binary image data to attach.
+            filename (str): Filename for the attachment. Defaults to "image.jpg".
+            priority (int, optional): Message priority (1-5). Defaults to 5.
+
+        Returns:
+            bool: True if the message was sent successfully, False otherwise.
+        """
+        if not self.base_url or not self.token or not self.topic:
+            print("[!] Missing NTFY_URL, NTFY_TOKEN, or NTFY_TOPIC")
+            return False
+
+        url = f"{self.base_url}/{self.topic}"
+
+        # Sanitize message for HTTP header (no newlines/carriage returns allowed)
+        safe_message = message.replace('\r', ' ').replace('\n', ' ').strip()
+
+        headers = {
+            "Authorization": f"Bearer {self.token}",
+            "Title": title,
+            "Priority": str(priority),
+            "Filename": filename,
+            "Message": safe_message,
+        }
+
+        try:
+            response = requests.put(url, headers=headers, data=image_data, timeout=10)
+            response.raise_for_status()
+            return True
+        except requests.RequestException as e:
+            print(f"[!] Failed to send Ntfy message with image: {e}")
+            return False