trails/openspec/changes/mobile-app/specs/web-push-relay/spec.md
Ullrich Schäfer cd939ccf07
Complete mobile app specs: fill all gaps
Design fixes:
- D6: Cleaned up, points to separate activity-recording change
- D13: Locked in TanStack Query + Zustand + React Context
- D14: Tile hosting (OpenFreeMap default, configurable tileUrl)
- D15: Photo/media (presigned upload URLs, thumbnails)
- D16: Journal REST API implementation (api.v1.*.ts route modules)

New specs (4):
- web-push-relay: Web Push → APNs/FCM relay (Mastodon pattern)
- api-contract-package: @trails-cool/api with Zod schemas
- device-management: Connected devices list + revoke
- photo-media: Presigned uploads, thumbnails, photo display

Task updates:
- Added Phase 2: Journal REST API (16 tasks)
- Added Phase 7: Notifications (8 tasks)
- Renumbered all phases (1-7)
- 112 total tasks

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-12 22:12:54 +02:00

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2.4 KiB
Markdown

## ADDED Requirements
### Requirement: Web Push API on Journal
The Journal SHALL implement the standard Web Push API (RFC 8030) for sending push notifications to subscribed clients.
#### Scenario: Subscribe to push notifications
- **WHEN** a client sends `POST /api/v1/push/subscribe` with a push subscription object (endpoint URL, p256dh key, auth secret)
- **THEN** the Journal stores the subscription and uses it to deliver future notifications for that user
#### Scenario: Receive route update notification
- **WHEN** a shared route is updated by another user
- **THEN** the Journal sends an encrypted Web Push message to all subscribers of that route's owner
#### Scenario: Unsubscribe from push notifications
- **WHEN** a client sends `DELETE /api/v1/push/unsubscribe` with the subscription endpoint URL
- **THEN** the Journal removes the subscription and stops sending notifications to it
### Requirement: Push relay service
A relay service SHALL translate Web Push messages into platform-native push notifications (APNs for iOS, FCM for Android).
#### Scenario: Relay forwards encrypted payload to APNs
- **WHEN** the relay receives a Web Push message destined for an iOS device
- **THEN** the relay forwards the encrypted payload to APNs without decrypting or reading the content
#### Scenario: Relay forwards encrypted payload to FCM
- **WHEN** the relay receives a Web Push message destined for an Android device
- **THEN** the relay forwards the encrypted payload to FCM without decrypting or reading the content
#### Scenario: End-to-end encryption
- **WHEN** a notification is sent from the Journal through the relay to the device
- **THEN** the relay cannot read the notification content — only the mobile app can decrypt it using the subscription keys
### Requirement: Self-hosted relay compatibility
Self-hosted Journal instances SHALL send push notifications through the hosted relay by default, with an option to run a private relay.
#### Scenario: Default relay for self-hosted instances
- **WHEN** a self-hosted Journal instance sends a Web Push notification
- **THEN** it sends the standard Web Push request to the trails.cool hosted relay (no Apple/Google credentials needed on the self-hosted instance)
#### Scenario: Custom relay for self-hosters
- **WHEN** a self-hosted administrator configures a custom relay URL
- **THEN** the Journal sends Web Push requests to the custom relay instead of the hosted one