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feat(journal): Fedify spike — WebFinger + actor objects behind FEDERATION_ENABLED

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social-federation tasks 1.1–1.3:

- Add @fedify/fedify pinned to exactly 2.1.16: every 2.2.x release
  depends on @fedify/webfinger@2.2.x which was never published to npm,
  so 2.1.16 is the newest installable version.
- app/lib/federation.server.ts: Federation instance with an actor
  dispatcher serving Person objects for public users; private and
  unknown users 404 (no existence leak). MemoryKvStore for now.
- /.well-known/webfinger resource route delegating to federation.fetch.
- ActivityPub content negotiation on /users/:username via route
  middleware (future.v8_middleware — no loader uses the context arg,
  so the flag is a no-op for existing code).
- FEDERATION_ENABLED env flag (default off) gating every federation
  surface.
- Unit tests exercise the Fedify dispatcher as a remote AP client:
  WebFinger resolution, actor fetch with Mastodon's Accept header,
  private-user 404s, flag-off 404s.

Spike verdict: Fedify fits — URL dispatch, JRD/AP serialization, and
visibility gating all work through framework routes without a custom
server layer.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Ullrich Schäfer 2026-06-06 13:33:51 +02:00
parent 8638c2fdfa
commit 4ef86e4dc2
9 changed files with 518 additions and 13 deletions
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6
openspec/changes/social-federation/tasks.md
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@ -1,8 +1,8 @@
## 1. Library + dependencies
- [ ] 1.1 Spike Fedify on a branch: import, mount minimal actor object endpoint for one user, validate WebFinger lookup from a remote AP client. Confirm fit. If unfit, document why and pivot to alternative
- [ ] 1.2 Add Fedify (or chosen lib) to `apps/journal/package.json`; document version pinning rationale
- [ ] 1.3 Add `FEDERATION_ENABLED` env var (default `false`) and a thin runtime feature flag the rest of the change reads from
- [x] 1.1 Spike Fedify on a branch: import, mount minimal actor object endpoint for one user, validate WebFinger lookup from a remote AP client. Confirm fit. If unfit, document why and pivot to alternative
- [x] 1.2 Add Fedify (or chosen lib) to `apps/journal/package.json`; document version pinning rationale
- [x] 1.3 Add `FEDERATION_ENABLED` env var (default `false`) and a thin runtime feature flag the rest of the change reads from
## 2. Schema