HealthLog/docs/self-hosting/notifications.md

Notifications — push channels for a self-host

HealthLog delivers reminders (medication doses, mood check-ins, personal records) and a few operational alerts through a small cascade of push channels. The single message to take away: you do not need an Apple Developer account or APNs to get push. Three of the four channels are free, work in the browser or in a messaging app you already have, and cover every platform a self-hoster runs. APNs is only for the optional native iOS app.

When an event fires, the dispatcher fans it out to every channel a user has enabled, in a fixed order — APNs first, then Telegram, then ntfy, then Web Push as the universal fallback (src/lib/notifications/dispatcher.ts). Each channel is best-effort and independent: a user can enable one, two, or all four, and a failure on one never blocks the others.

TL;DR — which channel needs what

Channel	What it needs	Cost	Where it works
Web Push	A VAPID keypair (one command, or paste into the admin panel)	Free	Any modern desktop/Android browser; the installed PWA on iPhone (iOS 16.4+, after Add to Home Screen)
Telegram	A bot token from @BotFather + each user's chat ID	Free	Anywhere the Telegram app runs
ntfy	A topic on ntfy.sh or your own ntfy server	Free	The ntfy app (iOS/Android) or any browser
APNs	An Apple Developer account + a .p8 push key	Apple Developer Program (paid)	The native iOS app only (TestFlight / App Store)

Web Push is the recommended default — it needs no third-party account, just a keypair you generate yourself once.

Web Push (recommended default)

Web Push delivers notifications straight to a browser — desktop or mobile — even when the HealthLog tab is closed, as long as the browser or installed PWA is alive. It is the broadest-reach channel and the one to set up first.

1. Generate a VAPID keypair

VAPID is the signing scheme that lets a push service trust your server. Generate a keypair once with the bundled web-push CLI:

npx web-push generate-vapid-keys

That prints a public key and a private key (both Base64URL). You also choose a subject — a mailto: address the push service can contact about your sender, e.g. mailto:you@example.com.

2. Store the keys

The server loads VAPID config from the database first and falls back to environment variables (src/lib/notifications/vapid-config.ts). Either path works; the admin panel is the easier one because it survives without touching .env.

Admin panel (preferred). Sign in as the admin user, open /admin, and find the Web Push VAPID card (src/components/admin/web-push-vapid-section.tsx). Paste the public key, the private key, and the subject, then save. The private key is encrypted at rest with your ENCRYPTION_KEY, exactly like the other secrets in the admin panel. The card shows a "configured" badge once all three fields are set.

Environment variables (alternative). If you would rather keep secrets out of the database, set them in .env / the compose environment: block instead:

VAPID_PUBLIC_KEY="BElx...(public key)"
VAPID_PRIVATE_KEY="...(private key)"
VAPID_SUBJECT="mailto:you@example.com"

The database values win when both are present. The loader also accepts a few aliases (WEB_PUSH_VAPID_PUBLIC_KEY, WEB_PUSH_PUBLIC_KEY, and the private/subject equivalents) so a config copied from another deployment keeps working.

3. Subscribe a device

Each user enables Web Push for their own browser from /settings/notifications — the Browser Push card has a Subscribe button, and a Test button to fire a one-off push once subscribed. The browser prompts for notification permission on first subscribe; once granted, that browser receives every enabled event.

iPhone caveat — Add to Home Screen first

Safari on iPhone supports Web Push only from iOS 16.4 or newer, and only for a site that has been installed to the Home Screen as a PWA. A regular Safari tab cannot subscribe. So on iPhone:

1. Open your HealthLog instance in Safari.
2. Tap the Share button, then Add to Home Screen.
3. Launch HealthLog from the new Home Screen icon (not from the Safari tab).
4. Open /settings/notifications inside that installed app and tap Subscribe; accept the permission prompt.

Android and desktop browsers have no such step — Subscribe and grant the permission, and push works.

Telegram

Telegram delivers reminders as bot messages, with inline action buttons on medication reminders (Taken / snooze / skip). It is a good fit when you already live in Telegram or want push without running a browser.

1. In Telegram, open @BotFather, create a bot, and copy the bot token (it looks like 123456:ABC-DEF...).
2. Send /start to your new bot so it can message you.
3. Find your chat ID — send a message to @userinfobot, or read it from the Bot API.
4. In HealthLog open /settings/notifications, fill the Telegram card's Bot Token and Chat ID, toggle it on, and save.

One bot can serve every user on the instance; each user pairs their own chat ID. The token is encrypted at rest.

ntfy

ntfy is the most self-hoster-native option: a tiny pub/sub push relay you can use hosted (ntfy.sh) or run yourself. You subscribe to a topic in the ntfy app (iOS/Android) or a browser, and HealthLog publishes to that topic.

1. Pick a hard-to-guess topic name (the topic is the access control on public ntfy.sh — anyone who knows the string can read it, so treat it like a secret).
2. Subscribe to that topic in the ntfy app or at https://ntfy.sh/<topic>.
3. In HealthLog open /settings/notifications, set the ntfy card's Server URL (defaults to https://ntfy.sh; point it at your own server if you self-host ntfy) and Topic, then save.

If your ntfy server requires auth, an access token can be attached; the server URL is validated as a public host and dialled through the egress guard (src/lib/notifications/senders/ntfy.ts).

APNs — native iOS app only

Apple Push Notification service is used by only the native SwiftUI iOS app (TestFlight / App Store build). PWA and browser users never touch it. Setting it up requires a paid Apple Developer Program membership.

You do not need APNs to give iPhone users push: the installed PWA gets every reminder over Web Push (see the iPhone caveat above). APNs adds one Apple-platform exclusive the PWA cannot offer — the lock-screen Live Activity — plus the tighter native delivery path. Reminders themselves arrive on both.

If you do run the native app and want server-driven push, set the APNs manifest (src/lib/notifications/senders/apns.ts) — three identifiers plus exactly one key source:

Variable	Purpose
APNS_KEY_ID	The .p8 key's Key ID
APNS_TEAM_ID	Your Apple Developer Team ID
APNS_BUNDLE_ID	The app's bundle identifier
APNS_KEY_B64	The .p8 PEM, base64-encoded (recommended key source)
APNS_KEY	OR the raw PEM body inline
APNS_KEY_FILE	OR a path to the .p8 file

APNs is all-or-none: either set the three IDs plus one key source, or leave the whole block unset. A partial config is rejected so the channel never silently half-works (scripts/check-env.ts). When more than one key source is present, the precedence is APNS_KEY_B64 > APNS_KEY > APNS_KEY_FILE.

Two gotchas worth knowing before you blame a stale token:

• Base64 the key. Pasting a raw .p8 PEM through some env-file pipelines mangles its line breaks. APNS_KEY_B64 (the PEM body, base64-encoded) sidesteps that entirely and is the recommended source.
• Scope the key "Sandbox & Production". In the Apple Developer Portal, a push key defaults to Sandbox-only. A Sandbox-only key fails on production (TestFlight / App Store) device tokens with BadEnvironmentKeyInToken. Confirm the key shows Sandbox & Production; a wrongly scoped key cannot be reconfigured — re-issue it.

Which channel should I pick?

Your setup	Recommended channel
PWA on Android or desktop	Web Push — generate a VAPID keypair, subscribe, done.
PWA on an iPhone	Web Push, but install the PWA via Add to Home Screen first (iOS 16.4+). Reminders work; the lock-screen Live Activity needs the native app.
You want the native iOS app's full experience	APNs (paid Apple Developer account) plus Web Push as a fallback for any non-iOS device.
Headless / no browser, or you live in chat	Telegram or ntfy — neither needs a browser, both are free. ntfy is the most self-host-native; Telegram adds inline reminder action buttons.

Mixing channels is fine and common — e.g. Web Push on the laptop and ntfy on the phone. Each user configures their own set from /settings/notifications.