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Simon Taylor
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node_modules/
server.log
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# sh3d — Web Push Notification PoC
Tests the full Web Push loop: browser subscription → server-side send → notification
delivered even when the tab is closed.
## Prerequisites (for the cattletrack staging server)
- The node server must be running on the staging box:
```bash
cd /home/unisolve/sh3d
nohup node server.js > server.log 2>&1 &
echo $! > server.pid
```
- nginx must be running with the `/sh3d/` and `/sh3d/api/` location blocks configured.
## Testing from a phone
### One-time setup (do this once per device/browser)
Open a **regular tab** (not private/incognito) in Firefox or Chrome on your phone and
navigate to:
```
https://staging.cattletrack.au/sh3d/
```
Then tap the buttons in order:
1. **Register service worker** — installs the background service worker
2. **Request permission** — Android will show a system prompt; tap Allow
3. **Fire a local notification** — confirms notifications work while the tab is open
4. **Subscribe to push** — registers this device with the server; from this point on
the server can reach the device even when the browser is closed
Each step logs its result in the blue status box. All four should succeed before
proceeding.
> **Private tabs won't work.** Service workers are discarded when a private tab closes,
> so push subscriptions won't survive. Use a regular tab.
> **Firefox on Android:** go to Android Settings → Apps → Firefox → Notifications and
> confirm Lock screen, Badge, and Pop-up are all allowed.
### Triggering a push from the command line
Once a device has completed step 4, you can push to it from any terminal — including
with the browser fully closed:
```bash
curl -s -X POST https://staging.cattletrack.au/sh3d/api/send \
-H "Content-Type: application/json" \
-d '{"title": "OGLAS trough alert!", "body": "Trough 21 appears to be empty"}' | jq .
```
A successful response looks like:
```json
{ "sent": 1, "results": [{ "endpoint": "https://...", "ok": true }] }
```
The notification appears on the phone lock screen / notification shade within a few
seconds.
### Button 5 (in-page send)
**Ask server to push now** does the same thing as the curl command above but from
within the page. Useful for a quick sanity check when the tab is open; use curl to
prove it works with the tab backgrounded or closed.
## Files
| File | Purpose |
|---|---|
| `server.js` | Express server — serves /public, stores subscriptions in memory, exposes /api/send |
| `public/index.html` | Test page with the 5-step flow |
| `public/sw.js` | Service worker — handles incoming push events and notification taps |
| `public/icon.svg` | Notification icon |
## Known limitations (PoC only)
- Subscriptions are stored **in memory** — lost when the server restarts. After a
restart each device must repeat step 4.
- VAPID keys are hardcoded in `server.js` — move them to `.env` before any
production use.
- One server instance, no redundancy.
package-lock.json
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"integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
"license": "MIT",
"engines": {
"node": ">= 0.8"
}
},
"node_modules/web-push": {
"version": "3.6.7",
"resolved": "https://registry.npmjs.org/web-push/-/web-push-3.6.7.tgz",
"integrity": "sha512-OpiIUe8cuGjrj3mMBFWY+e4MMIkW3SVT+7vEIjvD9kejGUypv8GPDf84JdPWskK8zMRIJ6xYGm+Kxr8YkPyA0A==",
"license": "MPL-2.0",
"dependencies": {
"asn1.js": "^5.3.0",
"http_ece": "1.2.0",
"https-proxy-agent": "^7.0.0",
"jws": "^4.0.0",
"minimist": "^1.2.5"
},
"bin": {
"web-push": "src/cli.js"
},
"engines": {
"node": ">= 16"
}
},
"node_modules/wrappy": {
"version": "1.0.2",
"resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
"integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
"license": "ISC"
}
}
}
package.json
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{
"name": "sh3d",
"version": "1.0.0",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC",
"description": "",
"dependencies": {
"express": "^5.2.1",
"web-push": "^3.6.7"
}
}
public/icon.svg
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 192 192" width="192" height="192">
<rect width="192" height="192" rx="32" fill="#1d4ed8"/>
<text x="96" y="130" font-size="110" text-anchor="middle" font-family="serif">🪣</text>
</svg>
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public/index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Notification + Push test</title>
<style>
body { font-family: system-ui, sans-serif; max-width: 32rem; margin: 2rem auto; padding: 0 1rem; line-height: 1.5; }
button { display: block; width: 100%; padding: .9rem; margin: .6rem 0; font-size: 1rem; border: 1px solid #999; border-radius: .5rem; background: #f5f5f5; }
button:active { background: #e5e5e5; }
h2 { margin-top: 1.5rem; font-size: 1rem; color: #555; border-bottom: 1px solid #ddd; padding-bottom: .25rem; }
#status { padding: .75rem; border-radius: .5rem; background: #eef; white-space: pre-wrap; font-size: .9rem; }
code { background: #eee; padding: 0 .25rem; border-radius: .25rem; }
</style>
</head>
<body>
<h1>Notification + Push test</h1>
<h2>Local (page open)</h2>
<button id="register">1. Register service worker</button>
<button id="permission">2. Request permission</button>
<button id="notify">3. Fire a local notification</button>
<h2>Push (server-sent, works with tab closed)</h2>
<button id="subscribe">4. Subscribe to push</button>
<button id="sendTest">5. Ask server to push now</button>
<div id="status">Status will appear here.</div>
<script>
const statusEl = document.getElementById('status');
function log(msg) {
statusEl.textContent = msg + '\n\n' +
'Permission: ' + Notification.permission + '\n' +
'SW controller: ' + (navigator.serviceWorker.controller ? 'yes' : 'no');
}
// VAPID public key arrives base64url-encoded; the browser needs a Uint8Array.
function urlBase64ToUint8Array(base64String) {
const padding = '='.repeat((4 - base64String.length % 4) % 4);
const base64 = (base64String + padding).replace(/-/g, '+').replace(/_/g, '/');
const raw = atob(base64);
return Uint8Array.from([...raw].map(c => c.charCodeAt(0)));
}
document.getElementById('register').addEventListener('click', async () => {
if (!('serviceWorker' in navigator)) return log('No service worker support.');
try {
await navigator.serviceWorker.register('sw.js');
await navigator.serviceWorker.ready;
log('Service worker registered and ready.');
} catch (e) {
log('Registration failed: ' + e);
}
});
document.getElementById('permission').addEventListener('click', async () => {
const result = await Notification.requestPermission();
log('Permission result: ' + result);
});
document.getElementById('notify').addEventListener('click', async () => {
if (Notification.permission !== 'granted') return log('Permission not granted yet (run step 2).');
const reg = await navigator.serviceWorker.ready; // Android Chrome needs the SW, not new Notification()
await reg.showNotification('OGLAS trough alert!', {
body: 'Trough 21 appears to be empty',
icon: '/sh3d/icon.svg',
badge: 'https://dummyimage.com/96x96/333/fff.png&text=!',
vibrate: [120, 60, 120],
tag: 'test', renotify: true,
actions: [ { action: 'open', title: 'Open' }, { action: 'dismiss', title: 'Dismiss' } ]
});
log('Local notification fired.');
});
document.getElementById('subscribe').addEventListener('click', async () => {
if (Notification.permission !== 'granted') return log('Grant permission first (step 2).');
try {
const reg = await navigator.serviceWorker.ready;
const key = await (await fetch('/sh3d/api/vapidPublicKey')).text();
const sub = await reg.pushManager.subscribe({
userVisibleOnly: true, // required on Chrome
applicationServerKey: urlBase64ToUint8Array(key)
});
await fetch('/sh3d/api/subscribe', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(sub)
});
log('Subscribed and sent subscription to server.');
} catch (e) {
log('Subscribe failed: ' + e);
}
});
document.getElementById('sendTest').addEventListener('click', async () => {
try {
const res = await fetch('/sh3d/api/send', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({ title: 'Server push', body: 'If you see this, the loop works.' })
});
const data = await res.json();
log('Server reports sent to ' + data.sent + ' subscription(s).\nNow background the tab and send again to prove it works closed.');
} catch (e) {
log('Send request failed: ' + e);
}
});
</script>
</body>
</html>
public/sw.js
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// sw.js — service worker for the notification + push test page.
self.addEventListener('install', () => self.skipWaiting());
self.addEventListener('activate', (event) => event.waitUntil(self.clients.claim()));
// Server-sent push lands here even when every tab is closed.
self.addEventListener('push', (event) => {
const data = event.data ? event.data.json() : {};
event.waitUntil(
self.registration.showNotification(data.title || 'Push', {
body: data.body || '',
icon: 'https://dummyimage.com/192x192/47a/fff.png&text=%E2%86%93',
vibrate: [120, 60, 120],
tag: 'push'
})
);
});
// Handle taps on the notification or its action buttons.
self.addEventListener('notificationclick', (event) => {
const action = event.action; // '', 'open', or 'dismiss'
event.notification.close();
if (action === 'dismiss') return;
event.waitUntil(
self.clients.matchAll({ type: 'window', includeUncontrolled: true }).then((windows) => {
for (const win of windows) {
if ('focus' in win) return win.focus();
}
if (self.clients.openWindow) return self.clients.openWindow('/');
})
);
});
server.js
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// server.js — minimal Web Push backend.
//
// Setup:
// npm init -y
// npm install express web-push
// npx web-push generate-vapid-keys # paste the two keys below
// node server.js
//
// Serves the static test page from ./public, stores subscriptions in memory,
// and exposes /api/send to push to every stored subscription.
const express = require('express');
const webpush = require('web-push');
const path = require('path');
const app = express();
app.use(express.json());
app.use(express.static(path.join(__dirname, 'public')));
// --- VAPID keys -----------------------------------------------------------
// Paste the output of `npx web-push generate-vapid-keys` here.
const VAPID_PUBLIC = 'BDjn64xCA8SGTAZy8Tes-Kqm44sgFTyZlgXRfpeKvUjSSFdnfI4ru0jY64JExOlfV4qNke7kqKb6B_sBUmbTdIY';
const VAPID_PRIVATE = 'u2cXEA3HC2FUY7f4FedQNqnAcOeFdfG655WK_ktYWbQ';
webpush.setVapidDetails(
'mailto:simon@unisolve.com.au', // contact the push service can reach if there's a problem
VAPID_PUBLIC,
VAPID_PRIVATE
);
// Expose the public key so the page can subscribe without hardcoding it.
app.get('/api/vapidPublicKey', (req, res) => res.send(VAPID_PUBLIC));
// --- Subscription store ---------------------------------------------------
// In-memory for testing. Use a real table (one row per device) in production.
const subscriptions = new Map(); // endpoint -> subscription object
app.post('/api/subscribe', (req, res) => {
const sub = req.body;
if (!sub || !sub.endpoint) return res.status(400).json({ error: 'bad subscription' });
subscriptions.set(sub.endpoint, sub);
console.log('Stored subscription. Total:', subscriptions.size);
res.status(201).json({ ok: true });
});
// --- Send a push to everyone ----------------------------------------------
// POST /api/send { "title": "...", "body": "..." }
app.post('/api/send', async (req, res) => {
const payload = JSON.stringify({
title: req.body.title || 'Test push',
body: req.body.body || 'Sent from the server at ' + new Date().toLocaleTimeString()
});
const results = [];
for (const [endpoint, sub] of subscriptions) {
try {
await webpush.sendNotification(sub, payload);
results.push({ endpoint, ok: true });
} catch (err) {
// 404/410 mean the subscription is dead — drop it so we stop trying.
if (err.statusCode === 404 || err.statusCode === 410) {
subscriptions.delete(endpoint);
results.push({ endpoint, ok: false, removed: true });
} else {
results.push({ endpoint, ok: false, status: err.statusCode });
}
}
}
res.json({ sent: results.length, results });
});
const PORT = process.env.PORT || 8000;
app.listen(PORT, () => console.log(`Listening on http://localhost:${PORT}`));