thermograph/static/subscriptions.html
Emi Griffith f34ab7ef96 Add PWA + Web Push delivery for weather alerts (#95)
Make the app installable and deliver existing alert notifications as OS
push, alongside the in-app bell.

Backend:
- PushSubscription model (per-device endpoint + keys, owned by a user) and
  register/unregister/test endpoints under /api/v2/push, cookie-auth scoped
  to the user like the subscription routes.
- push.py: VAPID key management (env -> data/vapid.json -> generated) and a
  pywebpush send helper that reports gone endpoints for pruning. No DB coupling.
- notify.py: after creating an in-app Notification, dispatch Web Push to the
  user's devices (guarded — a push failure never affects the in-app write;
  endpoints reported gone are pruned).
- Serve the .webmanifest with the correct media type.

Frontend:
- manifest.webmanifest + 192/maskable icons; <link rel="manifest"> on all pages.
- sw.js: push + notificationclick handlers (push-only; no fetch caching, so it
  doesn't fight the existing IndexedDB cache). Registered globally in nav.js in
  secure contexts.
- push-client.js + a "Notifications on this device" toggle and test-send on the
  /alerts page, subscribing through the existing cookie-aware apiFetch.

Push and service workers require a secure context, so this is active over HTTPS
(or http://localhost) and cleanly no-ops on a plain-HTTP LAN origin.
2026-07-15 23:21:06 +00:00

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HTML

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Thermograph — weather alerts</title>
<meta name="description" content="Subscribe to a city and get notified when its weather is unusually extreme — above the percentile you choose." />
<meta name="theme-color" content="#f0803c" />
<meta property="og:type" content="website" />
<meta property="og:site_name" content="Thermograph" />
<meta property="og:title" content="Thermograph — weather alerts" />
<meta property="og:description" content="Subscribe to a city and get notified when its weather is unusually extreme — above the percentile you choose." />
<meta property="og:url" content="__ORIGIN__/alerts" />
<meta property="og:image" content="__ORIGIN__/logo.png" />
<meta property="og:image:width" content="512" />
<meta property="og:image:height" content="512" />
<meta property="og:image:alt" content="Thermograph logo" />
<meta name="twitter:card" content="summary" />
<link rel="icon" href="logo.svg" type="image/svg+xml" />
<link rel="apple-touch-icon" href="logo.png" />
<link rel="manifest" href="manifest.webmanifest" />
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" />
<link rel="stylesheet" href="style.css" />
</head>
<body>
<header>
<div class="brand">
<span class="logo"></span>
<div>
<h1>Thermograph · Alerts</h1>
<p class="tag">Get notified when a city's weather passes the percentile you set</p>
</div>
<nav class="view-nav" aria-label="Views">
<a href="./" data-view="map">Weekly</a>
<a href="calendar" data-view="calendar">Calendar</a>
<a href="day" data-view="day">Day</a>
<a href="compare" data-view="compare">Compare</a>
</nav>
</div>
</header>
<main>
<section id="alerts-body" class="alerts-body">
<p class="alerts-loading">Loading…</p>
</section>
</main>
<script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
<script type="module" src="subscriptions.js"></script>
</body>
</html>