Tasks 6.1–6.6. A local user can follow a user on another trails
instance: WebFinger-resolve the handle, verify the target runs
trails.cool via NodeInfo — checked against the ACTOR IRI's host, never
the handle's domain (split-domain constraint) — record a Pending
follow row, deliver a signed Follow. The §4 inbox listeners already
settle (Accept) or drop (Reject) the row.
- federation-outbound.server.ts: followRemoteActor / cancelRemoteFollow
(Undo delivery) / listOutgoingRemoteFollows. Network steps (lookup,
NodeInfo, delivery) injectable for offline integration tests.
Software allowlist: trails-cool.
- /follows/outgoing: follow-by-handle form + pending/accepted list +
cancel; linked from the feed empty state; i18n en+de. Remote actors
have no local profile page, so the remote Pending state lives here
(the profile Pending button from locked accounts covers local).
- /.well-known/trails-cool now publishes software: trails-cool (6.2).
- Clear 4xx codes: invalid_handle, local_handle, remote_resolve_failed,
not_trails (6.3).
- Tests: handle-parser + allowlist units; integration suite for the
Pending lifecycle (create/idempotent/refuse-non-trails/refuse-
unresolvable/own-host/cancel+Undo) with injected network deps; e2e
anonymous-redirect guard for the new page.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Prompted by Hollo's split-domain setup. Two parts:
- docs/ideas/split-domain-handles.md: offering split handle/server
domains to self-hosters is config-level work — Fedify's origin
option natively accepts { handleHost, webOrigin } — and handles are
permanent identity, so apex handles matter. Single-domain stays the
default (Decision #18); post-launch polish.
- Interop constraint pinned in social-federation task 6.1 and
route-federation's gating decision: the trails-to-trails NodeInfo
check must run against the actor IRI's host after WebFinger
resolution, never the handle's domain — split-domain remote
instances would otherwise be wrongly refused.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
social-federation tasks 5.1–5.6. Completes the inbound-federation
story: a Mastodon follower now receives a trails user's new public
activities in their home timeline.
Outbox (5.1/5.2):
- /users/:username/outbox — paginated OrderedCollection of public
activities as Create(Note), newest first; unlisted/private never
federate. Private-user 404 enforced at the route layer because
Fedify builds collection-level responses from counter/cursors
without consulting the page dispatcher.
- Note shape: HTML content (escaped name/description/stats + link to
the activity page) with structured PropertyValue attachments
(distance-m, elevation-gain-m, duration-s) — Mastodon renders the
text, trails consumers read the structured fields. Resolves the
design open question toward Create(Note).
- Authorized Fetch: signed and unsigned outbox fetches deliberately
see the same (public-only) content until locked accounts exist.
Push delivery (5.3–5.6):
- createActivity / updateActivityVisibility(→public) enqueue one
deliver-activity job per accepted remote follower; flips away from
public and hard deletes enqueue Delete(Tombstone) retractions
(enqueued before the row disappears).
- deliver-activity job: re-reads the row at delivery time (skips if
gone or no longer public), resolves the recipient inbox via the
remote_actors cache with actor-document fetch fallback (priming the
cache), HTTP-signs via the owner's key, and POSTs. retryLimit 8 +
exponential backoff at enqueue time; outbound paced at 1 req/s per
remote host.
- Actor objects now advertise the outbox IRI.
- @js-temporal/polyfill added (same range Fedify uses) for published
timestamps; Fedify's types want the global esnext.temporal namespace,
bridged with a documented cast.
Tests: 9 unit tests for the AS mapping (escaping, stats, attachments,
published fallback, stable ids, tombstones), 4 outbox integration
tests (collection count, page shape/visibility filtering, private-404,
delivery audience query).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
social-federation tasks 3.1–3.4, 4.1–4.8. With this, a Mastodon user
can follow a public trails user: WebFinger → actor fetch → signed
Follow → recorded + Accept(Follow) pushed back.
Identity surface (section 3):
- Actor objects now carry the user's public key (publicKey +
assertionMethods via Fedify key pairs dispatcher; keys generated
lazily as a fallback to the backfill) and an inbox IRI; url uses
localActorIri (3.1).
- Software discovery shipped as standard NodeInfo
(/.well-known/nodeinfo + /nodeinfo/2.1, software.name trails-cool)
instead of the originally-sketched custom AS actor field — Fedify's
typed vocab can't emit arbitrary actor props and NodeInfo is what
the fediverse reads. Artifacts updated accordingly (3.4).
Inbox (section 4):
- /users/:username/inbox resource route; HTTP Signatures verified by
Fedify before any listener runs (4.1). Rate-limited 60 req/5 min per
source instance (host from Signature keyId) BEFORE verification so
hostile instances can't burn CPU on key fetches (4.8).
- Listeners: Follow → auto-accept for public profiles + Accept pushed
back (4.2); Undo(Follow) → row removed (4.3); Accept(Follow) →
Pending settled + first outbox poll enqueued (4.4); Reject(Follow) →
Pending dropped (4.5; UI notice deferred to 6.6). Unhandled types
are acknowledged + dropped by Fedify (4.6).
- Replay protection via Fedify's KvStore, now Postgres-backed
(journal.federation_kv + daily sweep job) so dedupe survives
restarts (4.7).
Schema (discovered requirement):
- follows.follower_id relaxed to nullable + follows.follower_actor_iri
for inbound remote followers — the proposal's 'follows is already
federation-ready' only held for outbound. Check constraint enforces
exactly one follower identity; partial unique index dedupes remote
follows. Notification fan-out + approve flow now filter local
followers explicitly. Design/proposal updated.
Tests: 7 inbox integration tests (accept/refuse/idempotence/undo/
settle/reject/check-constraint), 6 KvStore integration tests, 2 unit
tests for source-host extraction. All against real Postgres, gated on
FEDERATION_INTEGRATION=1.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
social-federation tasks 2.1–2.5:
- users.public_key / users.private_key_encrypted (TEXT NULL): RSA 2048
keypairs as JWK JSON; private key AES-256-GCM encrypted at rest with
FEDERATION_KEY_ENCRYPTION_KEY.
- remote_actors table: cache of remote AP actors (display fields,
inbox/outbox URLs, public key, software discovery field, poll cursor).
- activities.remote_origin_iri (UNIQUE) / remote_actor_iri / audience:
provenance + audience tagging for rows ingested from remote outboxes.
Replay-safe ingestion keys off the unique origin IRI.
- crypto.server.ts: generalized into createAesCipher(envVar, salt)
factory; existing INTEGRATION_SECRET surface unchanged.
- federation-keys.server.ts: generate/ensure/load keypairs.
RSASSA-PKCS1-v1_5 because that's what Mastodon interops on.
- backfill-user-keypairs pg-boss job: enqueued once per server startup
when FEDERATION_ENABLED=true; only touches users with NULL keys, so
re-runs are no-ops. New users get keys at registration (both passkey
and magic-link paths), best-effort with the backfill as safety net.
- design.md: noted open question — activities.owner_id is NOT NULL but
remote-ingested rows have no local owner; decide in task 7.2.
Schema is additive; zero behavior change while FEDERATION_ENABLED is
off. db:push verified clean against local Postgres.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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>
Follow-up to social-feed. Adds real ActivityPub: per-user actor
objects, WebFinger, signed inbox/outbox, push delivery on local
activity create, signed outbox-poll for remote trails actors.
Asymmetric scope keeps v1 small:
- Inbound: anyone (Mastodon, Pleroma, …) can follow a trails user
and receive their public activities via push delivery.
- Outbound: trails users can follow other *trails* instances only.
Following Mastodon/Pleroma/Misskey is refused at the API layer
with a clear "v1 limitation" message.
This avoids the engineering tar pit of robustly parsing arbitrary AP
vocabulary (Notes with attachments, polls, mentions, content warnings,
threads) while still delivering the core federation pitch.
Capabilities:
- New: social-federation
- Modified: social-follows (remote follows + Pending lifecycle)
- Modified: public-profiles (Pending button state, actor object gate)
- Modified: infrastructure (Fedify dep, key management runbook)
- Modified: security-hardening (HTTP Signatures, signed-fetch policy)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
