100 lines
3.8 KiB
Markdown
100 lines
3.8 KiB
Markdown
# k-ap
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Generic ActivityPub protocol layer for Rust services. Extracted from the `thoughts` and `movies-diary` projects.
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Wraps [`activitypub_federation`](https://crates.io/crates/activitypub_federation) and provides the plumbing that every AP-enabled service needs: actor management, inbox/outbox routing, follower tracking, WebFinger, NodeInfo, and HTTP signature handling.
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Not domain-specific — no opinions about what your content type looks like.
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## Add as dependency
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```toml
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[dependencies]
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k-ap = { git = "https://git.gabrielkaszewski.dev/GKaszewski/k-ap.git", tag = "v0.1.0" }
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```
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## What you implement
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Three traits wire your data layer into `k-ap`:
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```rust
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// Your database layer for follows, keypairs, remote actors, blocks
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impl FederationRepository for MyFederationRepo { ... }
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// Your user lookup (id, username, bio, avatar)
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impl ApUserRepository for MyUserRepo { ... }
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// Dispatch incoming AP objects to the right handler
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impl ApObjectHandler for MyObjectHandler { ... }
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```
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## Wire up the service
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```rust
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use k_ap::{ActivityPubService, FederationRepository, ApUserRepository, ApObjectHandler};
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let service = ActivityPubService::builder(
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Arc::new(my_federation_repo),
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Arc::new(my_user_repo),
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Arc::new(my_object_handler),
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"https://example.com",
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)
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.allow_registration(true)
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.software_name("my-app")
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.build()
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.await?;
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// Mount the AP routes onto your axum router
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let router = Router::new().merge(service.router());
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```
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## What the service handles for you
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- **Actor** — `GET /users/:id` serves the AP Person object with public key
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- **Inbox** — `POST /users/:id/inbox` + `POST /inbox` (shared), verifies HTTP signatures, dispatches to your `ApObjectHandler`
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- **Outbox** — `GET /users/:id/outbox` with OrderedCollection pagination
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- **Followers / Following** — `GET /users/:id/followers` and `/following`
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- **WebFinger** — `GET /.well-known/webfinger`
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- **NodeInfo** — `GET /.well-known/nodeinfo` + `GET /nodeinfo/2.1`
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## Broadcast from your domain layer
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```rust
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// Fan out a new note to all accepted followers
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service.broadcast_create_note(user_id, ¬e_json).await?;
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service.broadcast_update_note(user_id, ¬e_json).await?;
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// Announce / Undo Announce
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service.broadcast_announce_to_followers(user_id, object_ap_id).await?;
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service.broadcast_undo_announce_to_followers(user_id, object_ap_id, object_url).await?;
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// Like / Unlike to a remote inbox
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service.broadcast_like_to_inbox(user_id, object_ap_id, inbox_url).await?;
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service.broadcast_undo_like_to_inbox(user_id, object_ap_id, inbox_url).await?;
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// Follow / Unfollow / Accept / Reject
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service.follow(local_user_id, remote_actor_url, handle).await?;
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service.unfollow(local_user_id, remote_actor_url).await?;
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service.accept_follower(local_user_id, remote_actor_url).await?;
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service.reject_follower(local_user_id, remote_actor_url).await?;
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```
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## Project-specific ports
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`k-ap` does not define port traits tied to your domain (e.g. `OutboundFederationPort`, `ActivityPubRepository<Thought>`). Those belong in your adapter layer and are wired up there. See `crates/adapters/activitypub/src/port.rs` in `thoughts` for a reference implementation.
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## Key public types
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| Type | Description |
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|------|-------------|
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| `ActivityPubService` | Central service — build once, share via `Arc` |
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| `FederationData` | Request-scoped data passed through the federation layer |
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| `FederationRepository` | Trait: follows, keypairs, remote actors, blocks |
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| `ApUserRepository` | Trait: user lookup by id / username |
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| `ApObjectHandler` | Trait: dispatch incoming AP objects |
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| `RemoteActor` | A federated actor record |
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| `Follower` / `FollowerStatus` | Follower with pending/accepted/rejected state |
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| `ApUser` | AP-serializable local user |
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| `ApFederationConfig` | Wraps the `activitypub_federation` config |
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| `Error` | AP-layer error type |
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