feat: signed actor lookup and display_name on DbActor

Add display_name field to DbActor, populated from AP Person.name in
from_json. Expose LookedUpActor type and lookup_actor_by_handle method
on ActivityPubService — uses the existing signed webfinger_https path
so strict instances (Threads, etc.) return full actor data.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "k-ap"
-version = "0.1.0"
+version = "0.1.4"
 edition = "2024"
 description = "Generic ActivityPub protocol layer"
 license = "MIT"

README.md

@@ -0,0 +1,99 @@
+# k-ap
+
+Generic ActivityPub protocol layer for Rust services. Extracted from the `thoughts` and `movies-diary` projects.
+
+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.
+
+Not domain-specific — no opinions about what your content type looks like.
+
+## Add as dependency
+
+```toml
+[dependencies]
+k-ap = { git = "https://git.gabrielkaszewski.dev/GKaszewski/k-ap.git", tag = "v0.1.0" }
+```
+
+## What you implement
+
+Three traits wire your data layer into `k-ap`:
+
+```rust
+// Your database layer for follows, keypairs, remote actors, blocks
+impl FederationRepository for MyFederationRepo { ... }
+
+// Your user lookup (id, username, bio, avatar)
+impl ApUserRepository for MyUserRepo { ... }
+
+// Dispatch incoming AP objects to the right handler
+impl ApObjectHandler for MyObjectHandler { ... }
+```
+
+## Wire up the service
+
+```rust
+use k_ap::{ActivityPubService, FederationRepository, ApUserRepository, ApObjectHandler};
+
+let service = ActivityPubService::builder(
+    Arc::new(my_federation_repo),
+    Arc::new(my_user_repo),
+    Arc::new(my_object_handler),
+    "https://example.com",
+)
+.allow_registration(true)
+.software_name("my-app")
+.build()
+.await?;
+
+// Mount the AP routes onto your axum router
+let router = Router::new().merge(service.router());
+```
+
+## What the service handles for you
+
+- **Actor** — `GET /users/:id` serves the AP Person object with public key
+- **Inbox** — `POST /users/:id/inbox` + `POST /inbox` (shared), verifies HTTP signatures, dispatches to your `ApObjectHandler`
+- **Outbox** — `GET /users/:id/outbox` with OrderedCollection pagination
+- **Followers / Following** — `GET /users/:id/followers` and `/following`
+- **WebFinger** — `GET /.well-known/webfinger`
+- **NodeInfo** — `GET /.well-known/nodeinfo` + `GET /nodeinfo/2.1`
+
+## Broadcast from your domain layer
+
+```rust
+// Fan out a new note to all accepted followers
+service.broadcast_create_note(user_id, &note_json).await?;
+service.broadcast_update_note(user_id, &note_json).await?;
+
+// Announce / Undo Announce
+service.broadcast_announce_to_followers(user_id, object_ap_id).await?;
+service.broadcast_undo_announce_to_followers(user_id, object_ap_id, object_url).await?;
+
+// Like / Unlike to a remote inbox
+service.broadcast_like_to_inbox(user_id, object_ap_id, inbox_url).await?;
+service.broadcast_undo_like_to_inbox(user_id, object_ap_id, inbox_url).await?;
+
+// Follow / Unfollow / Accept / Reject
+service.follow(local_user_id, remote_actor_url, handle).await?;
+service.unfollow(local_user_id, remote_actor_url).await?;
+service.accept_follower(local_user_id, remote_actor_url).await?;
+service.reject_follower(local_user_id, remote_actor_url).await?;
+```
+
+## Project-specific ports
+
+`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.
+
+## Key public types
+
+| Type | Description |
+|------|-------------|
+| `ActivityPubService` | Central service — build once, share via `Arc` |
+| `FederationData` | Request-scoped data passed through the federation layer |
+| `FederationRepository` | Trait: follows, keypairs, remote actors, blocks |
+| `ApUserRepository` | Trait: user lookup by id / username |
+| `ApObjectHandler` | Trait: dispatch incoming AP objects |
+| `RemoteActor` | A federated actor record |
+| `Follower` / `FollowerStatus` | Follower with pending/accepted/rejected state |
+| `ApUser` | AP-serializable local user |
+| `ApFederationConfig` | Wraps the `activitypub_federation` config |
+| `Error` | AP-layer error type |

src/actors.rs

@@ -19,6 +19,7 @@ use crate::user::ApProfileField;
 pub struct DbActor {
     pub user_id: uuid::Uuid,
     pub username: String,
+    pub display_name: Option<String>,
     pub public_key_pem: String,
     pub private_key_pem: Option<String>,
     pub inbox_url: Url,
@@ -152,6 +153,7 @@ pub async fn get_local_actor(
     Ok(DbActor {
         user_id,
         username: user.username,
+        display_name: None,
         public_key_pem: public_key,
         private_key_pem: Some(private_key),
         inbox_url,
@@ -219,6 +221,7 @@ impl Object for DbActor {
         Ok(Some(DbActor {
             user_id,
             username: user.username,
+            display_name: None,
             public_key_pem: public_key,
             private_key_pem: private_key,
             inbox_url,
@@ -228,12 +231,12 @@ impl Object for DbActor {
             following_url,
             ap_id,
             last_refreshed_at: Utc::now(),
-            bio: None,
+            bio: user.bio,
-            avatar_url: None,
+            avatar_url: user.avatar_url,
-            banner_url: None,
+            banner_url: user.banner_url,
-            also_known_as: None,
+            also_known_as: user.also_known_as,
-            profile_url: None,
+            profile_url: user.profile_url,
-            attachment: vec![],
+            attachment: user.attachment,
         }))
     }
 
@@ -327,6 +330,7 @@ impl Object for DbActor {
         Ok(DbActor {
             user_id,
             username: json.preferred_username.clone(),
+            display_name: json.name.clone(),
             public_key_pem: json.public_key.public_key_pem,
             private_key_pem: None,
             inbox_url,

src/lib.rs

@@ -25,4 +25,4 @@ pub use repository::{
     BlockedDomain, FederationRepository, Follower, FollowerStatus, FollowingStatus, RemoteActor,
 };
 pub use service::ActivityPubService;
-pub use user::{ApProfileField, ApUser, ApUserRepository};
+pub use user::{ApProfileField, ApUser, ApUserRepository, LookedUpActor};

src/service.rs

@@ -224,6 +224,98 @@ impl ActivityPubService {
         Ok(Some((local_actor, collect_inboxes(&accepted))))
     }
 
+    /// Build an OrderedCollection or OrderedCollectionPage JSON for the local
+    /// user's followers list.  Pass `page = None` for the root collection.
+    pub async fn followers_collection_json(
+        &self,
+        user_id: uuid::Uuid,
+        page: Option<u32>,
+    ) -> anyhow::Result<String> {
+        const AP_CONTEXT: &str = "https://www.w3.org/ns/activitystreams";
+        const PAGE_SIZE: usize = 20;
+        let data = self.federation_config.to_request_data();
+        let collection_id = format!("{}/users/{}/followers", self.base_url, user_id);
+        let total = data.federation_repo.count_followers(user_id).await?;
+        let obj = if let Some(p) = page {
+            let p = p.max(1);
+            let offset = (p.saturating_sub(1) as usize) * PAGE_SIZE;
+            let followers = data
+                .federation_repo
+                .get_followers_page(user_id, offset as u32, PAGE_SIZE)
+                .await?;
+            let has_next = offset + followers.len() < total;
+            let items: Vec<String> = followers.into_iter().map(|f| f.actor.url).collect();
+            let mut obj = serde_json::json!({
+                "@context": AP_CONTEXT,
+                "type": "OrderedCollectionPage",
+                "id": format!("{}?page={}", collection_id, p),
+                "partOf": collection_id,
+                "totalItems": total,
+                "orderedItems": items,
+            });
+            if has_next {
+                obj["next"] =
+                    serde_json::json!(format!("{}?page={}", collection_id, p + 1));
+            }
+            obj
+        } else {
+            serde_json::json!({
+                "@context": AP_CONTEXT,
+                "type": "OrderedCollection",
+                "id": collection_id,
+                "totalItems": total,
+                "first": format!("{}?page=1", collection_id),
+            })
+        };
+        Ok(serde_json::to_string(&obj)?)
+    }
+
+    /// Build an OrderedCollection or OrderedCollectionPage JSON for the local
+    /// user's following list.  Pass `page = None` for the root collection.
+    pub async fn following_collection_json(
+        &self,
+        user_id: uuid::Uuid,
+        page: Option<u32>,
+    ) -> anyhow::Result<String> {
+        const AP_CONTEXT: &str = "https://www.w3.org/ns/activitystreams";
+        const PAGE_SIZE: usize = 20;
+        let data = self.federation_config.to_request_data();
+        let collection_id = format!("{}/users/{}/following", self.base_url, user_id);
+        let total = data.federation_repo.count_following(user_id).await?;
+        let obj = if let Some(p) = page {
+            let p = p.max(1);
+            let offset = (p.saturating_sub(1) as usize) * PAGE_SIZE;
+            let following = data
+                .federation_repo
+                .get_following_page(user_id, offset as u32, PAGE_SIZE)
+                .await?;
+            let has_next = offset + following.len() < total;
+            let items: Vec<String> = following.into_iter().map(|a| a.url).collect();
+            let mut obj = serde_json::json!({
+                "@context": AP_CONTEXT,
+                "type": "OrderedCollectionPage",
+                "id": format!("{}?page={}", collection_id, p),
+                "partOf": collection_id,
+                "totalItems": total,
+                "orderedItems": items,
+            });
+            if has_next {
+                obj["next"] =
+                    serde_json::json!(format!("{}?page={}", collection_id, p + 1));
+            }
+            obj
+        } else {
+            serde_json::json!({
+                "@context": AP_CONTEXT,
+                "type": "OrderedCollection",
+                "id": collection_id,
+                "totalItems": total,
+                "first": format!("{}?page=1", collection_id),
+            })
+        };
+        Ok(serde_json::to_string(&obj)?)
+    }
+
     pub async fn actor_json(&self, user_id_str: &str) -> anyhow::Result<String> {
         use activitypub_federation::traits::Object;
         let uuid = uuid::Uuid::parse_str(user_id_str)?;
@@ -238,6 +330,33 @@ impl ActivityPubService {
         Ok(serde_json::to_string(&WithContext::new_default(person))?)
     }
 
+    /// Resolve a `@user@domain` handle to actor data using a signed HTTP request.
+    /// Unlike a plain unauthenticated fetch, this works with instances (e.g. Threads)
+    /// that require HTTP signatures before returning full actor JSON.
+    pub async fn lookup_actor_by_handle(
+        &self,
+        handle: &str,
+    ) -> anyhow::Result<crate::user::LookedUpActor> {
+        let data = self.federation_config.to_request_data();
+        let actor = Self::webfinger_https(handle, &data).await?;
+        let domain = actor.ap_id.host_str().unwrap_or("").to_string();
+        let handle = format!("{}@{}", actor.username, domain);
+        Ok(crate::user::LookedUpActor {
+            handle,
+            display_name: actor.display_name,
+            bio: actor.bio,
+            avatar_url: actor.avatar_url,
+            banner_url: actor.banner_url,
+            ap_url: actor.ap_id,
+            outbox_url: actor.outbox_url,
+            followers_url: actor.followers_url,
+            following_url: actor.following_url,
+            also_known_as: actor.also_known_as,
+            profile_url: actor.profile_url,
+            attachment: actor.attachment,
+        })
+    }
+
     /// Returns the ActivityPub router compatible with any outer state `S`.
     /// Handlers only use `Data<FederationData>` injected by the middleware layer,
     /// so the router is independent of the application state type.

src/user.rs

@@ -7,6 +7,24 @@ pub struct ApProfileField {
     pub value: String,
 }
 
+/// Resolved actor data returned by [`crate::service::ActivityPubService::lookup_actor_by_handle`].
+/// Fetched via a signed HTTP request so strict instances (e.g. Threads) return full data.
+#[derive(Debug, Clone)]
+pub struct LookedUpActor {
+    pub handle: String,
+    pub display_name: Option<String>,
+    pub bio: Option<String>,
+    pub avatar_url: Option<Url>,
+    pub banner_url: Option<Url>,
+    pub ap_url: Url,
+    pub outbox_url: Url,
+    pub followers_url: Url,
+    pub following_url: Url,
+    pub also_known_as: Option<String>,
+    pub profile_url: Option<Url>,
+    pub attachment: Vec<ApProfileField>,
+}
+
 #[derive(Debug, Clone)]
 pub struct ApUser {
     pub id: uuid::Uuid,