Prism

Private notification gateway

Setup • Integrations • API • Examples • Monitoring

Prism sits between your services and your phone. Services send HTTP notifications; Prism delivers them to Signal, Telegram or WebPush. Prism is ntfy-compatible, so existing integrations work without changes. It can optionally monitor a Proton Mail inbox and send a notification for new emails.

Android companion app: prism-android

Setup

Docker (Recommended)

curl -L -O https://raw.githubusercontent.com/lone-cloud/prism/master/.env.example
mv .env.example .env
nano .env  # Set API_KEY=your-secret-key-here

curl -L -O https://raw.githubusercontent.com/lone-cloud/prism/master/docker-compose.yml
docker compose up -d

Binary (Alternative)

curl -L -O https://github.com/lone-cloud/prism/releases/latest/download/prism-linux-amd64
chmod +x prism-linux-amd64
mv prism-linux-amd64 prism

curl -L -O https://raw.githubusercontent.com/lone-cloud/prism/master/.env.example
mv .env.example .env
nano .env  # Set API_KEY=your-secret-key-here

./prism

Prism is now running at http://localhost:8080.

Security

Deploy behind HTTPS. Every API request sends your API_KEY in the Authorization header. Over plain HTTP that header is transmitted in cleartext — anyone who can observe the traffic between your callers and the server can read the key and make authenticated requests. Use a reverse proxy with TLS termination (Caddy, nginx, Traefik) or a tunnel service like Cloudflare Tunnel in front of Prism.

Only use http URLs when callers run on the same host and traffic never leaves the machine.

Integrations

All integrations are configured through the web UI. Authenticate with your API_KEY as the password (username can be anything).

Signal

Send notifications through Signal Messenger.

Setup:

1. Visit http://localhost:8080 and authenticate with your API_KEY
2. Expand the Signal integration card
3. Click "Link Device"
4. Scan the QR code with Signal on your phone:
   • Open Signal → Settings → Linked Devices → Link New Device
   • Scan the displayed QR code
5. Your device will link automatically

Note: Binary installs require signal-cli in your PATH. Docker includes it automatically.

Telegram

Send notifications through a Telegram bot.

Setup:

1. Create a bot:

   • Message @BotFather on Telegram
   • Send /newbot and follow the prompts
   • Copy the bot token

2. Get your Chat ID:

   • Message @userinfobot on Telegram
   • Copy your Chat ID from the response

3. Configure in Prism:

   • Visit http://localhost:8080 and authenticate with your API_KEY
   • Expand the Telegram integration card
   • Enter your bot token and chat ID
   • Click "Configure"

Proton Mail

Monitor a Proton Mail account and forward new emails as notifications through Signal or Telegram.

Setup:

1. Visit http://localhost:8080 and authenticate with your API_KEY
2. Configure Signal or Telegram first (required for routing)
3. Expand the Proton Mail integration card
4. Enter your Proton Mail credentials:
   • Email address
   • Password
   • 2FA code (if enabled)
5. Click "Link"

New emails appear as notifications from the "Proton Mail" app. Credentials are encrypted (AES-256-GCM) and tokens refresh automatically.

WebPush

Send notifications directly to your browser.

Setup:

1. Visit http://localhost:8080 and authenticate with your API_KEY
2. Allow browser notifications when prompted
3. Apps without Signal or Telegram configured will automatically use WebPush

API

All API endpoints require authentication with your API key:

Authorization: Bearer YOUR_API_KEY

ntfy-compatible publish API

Publish notifications to POST /{appName}.

{appName} is the target app/topic name. Messages are routed to all subscriptions configured for that app (Signal, Telegram, WebPush).

JSON payload:

curl -X POST http://localhost:8080/my-app \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"title": "Alert", "message": "Something happened"}'

JSON payload with image:

curl -X POST http://localhost:8080/my-app \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"title": "Motion Detected", "message": "Front door", "attach": "https://example.com/snapshot.jpg"}'

Plain text payload:

curl -X POST http://localhost:8080/my-app \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d "Simple message text"

WebPush subscription API

Register and remove WebPush subscriptions for an app.

POST /api/v1/webpush/subscriptions

Creates a WebPush subscription.

Required fields:

• appName
• pushEndpoint

Optional encrypted payload fields (must be provided together):

• p256dh
• auth
• vapidPrivateKey

curl -X POST http://localhost:8080/api/v1/webpush/subscriptions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "appName": "my-app",
    "pushEndpoint": "https://example.push.service/send/abc123",
    "p256dh": "BASE64URL_P256DH",
    "auth": "BASE64URL_AUTH",
    "vapidPrivateKey": "BASE64URL_VAPID_PRIVATE_KEY"
  }'

Minimal registration (without encrypted payload fields):

curl -X POST http://localhost:8080/api/v1/webpush/subscriptions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "appName": "my-app",
    "pushEndpoint": "http://localhost:9001/mock-push"
  }'

DELETE /api/v1/webpush/subscriptions/{subscriptionId}

Removes a WebPush subscription by ID.

curl -X DELETE http://localhost:8080/api/v1/webpush/subscriptions/SUBSCRIPTION_ID \
  -H "Authorization: Bearer YOUR_API_KEY"

Real-World Examples

Home Assistant

Add to configuration.yaml:

notify:
  - platform: rest
    name: Prism
    resource: "http://<Your Prism server network IP>/Home Assistant"
    method: POST_JSON
    headers:
      Authorization: !secret prism_api_key
    data_template:
      title: "{{ title }}"
      message: "{{ message }}"
      image: "{{ data.image | default('') }}"

Add to secrets.yaml:

prism_api_key: "Bearer YOUR_API_KEY_HERE"

Then use the notify.prism action in automations.

Sending an image from a camera snapshot:

Take a snapshot first, save it to HA's local static file server, then send the URL:

actions:
  - action: camera.snapshot
    target:
      entity_id: camera.front_door
    data:
      filename: /config/www/snapshot_front.jpg
  - action: notify.prism
    data:
      title: "Motion Detected"
      message: "Front door camera triggered"
      data:
        image: https://<your-ha-domain>/local/snapshot_front.jpg

The /config/www/ directory is served as /local/ by Home Assistant's built-in HTTP server. Use your HA's external HTTPS URL so Prism can fetch the image when delivering the notification.

Beszel

In Beszel's Settings → Notifications, add:

ntfy://:YOUR_API_KEY@<prism-host>:<port>/Beszel?disableTLS=yes

disableTLS=yes is only needed for local HTTP. The app name (Beszel) can be anything.

Monitoring

Health Endpoints

GET /health

Public. Returns 200 OK when running.

curl http://localhost:8080/health

GET /api/v1/health

Authenticated. Returns uptime and integration status:

curl http://localhost:8080/api/v1/health \
  -H "Authorization: Bearer YOUR_API_KEY"

{
  "version": "1.2.0",
  "uptime": "2h15m",
  "signal": {"linked": true, "account": "+1234567890"},
  "telegram": {"linked": true, "account": "123456789"},
  "proton": {"linked": true, "account": "user@proton.me"}
}