50 lines
2.0 KiB
TypeScript
50 lines
2.0 KiB
TypeScript
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/**
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* Quiet-hours suppression for partner-action pushes.
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*
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* The Settings UI promises "10 PM – 8 AM, no notifications". The client stores the window in local
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* DataStore AND mirrors it to the recipient's `users/{uid}` doc (quietHoursEnabled / *StartMinutes /
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* *EndMinutes / timezone). Because a partner push carries a `notification` block, the OS shows it
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* directly when the recipient app is backgrounded/killed — so the only place the promise can be kept
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* is server-side, here, before the push is sent (M-001).
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*
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* FAIL-OPEN by design: if quiet hours is not explicitly enabled, or any field (window/timezone) is
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* missing or malformed, we return `false` (do NOT suppress). A bug here can therefore only ever fall
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* back to today's behavior (notification delivered) — it can never wrongly drop a notification, and
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* existing installs keep delivering exactly as before until the client backfills the fields.
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*/
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export function recipientInQuietHours(
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userData: FirebaseFirestore.DocumentData | undefined,
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now: Date = new Date()
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): boolean {
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if (!userData || userData.quietHoursEnabled !== true) return false
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const start = userData.quietHoursStartMinutes
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const end = userData.quietHoursEndMinutes
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const tz = userData.timezone
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if (typeof start !== 'number' || typeof end !== 'number' || typeof tz !== 'string' || !tz) {
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return false
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}
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let nowMinutes: number
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try {
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const parts = new Intl.DateTimeFormat('en-US', {
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timeZone: tz,
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hour: '2-digit',
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minute: '2-digit',
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hour12: false,
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}).formatToParts(now)
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const hour = Number(parts.find((p) => p.type === 'hour')?.value) % 24
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const minute = Number(parts.find((p) => p.type === 'minute')?.value)
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if (Number.isNaN(hour) || Number.isNaN(minute)) return false
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nowMinutes = hour * 60 + minute
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} catch {
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// Unknown/invalid timezone id → fail open.
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return false
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}
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// Window may cross midnight (e.g. 22:00 → 08:00).
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return start <= end
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? nowMinutes >= start && nowMinutes <= end
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: nowMinutes >= start || nowMinutes <= end
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}
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