feat: unified social identity layer — SocialIdentity, ports, use cases, adapter

SocialIdentity value object (Local|Remote), SocialCommand/SocialQuery
domain ports, 11 CQRS use cases w/ 14 tests, CompositeSocialAdapter
wrapping k_ap, 6 new domain events, handlers migrated from ap_service
to use cases. Closes #12 foundation — AP handlers + legacy cleanup TBD.

crates/adapters/activitypub/src/lib.rs

@@ -1,4 +1,5 @@
 pub mod composite_handler;
+pub mod social_adapter;
 pub mod event_handler;
 pub mod federation_event_bridge;
 pub mod goal_handler;
@@ -24,6 +25,7 @@ pub use event_handler::ActivityPubEventHandler;
 pub use port::{ActivityPubPort, NoopActivityPubService};
 pub use remote_review_repository::{RemoteReviewRepository, RemoteReviewUpdate};
 pub use review_handler::ReviewObjectHandler;
+pub use social_adapter::CompositeSocialAdapter;
 pub use user_adapter::DomainUserRepoAdapter;
 
 pub type FederationRepos = (

crates/adapters/activitypub/src/social_adapter.rs

@@ -0,0 +1,254 @@
+use std::sync::Arc;
+
+use async_trait::async_trait;
+use domain::{
+    errors::DomainError,
+    ports::{SocialCommand, SocialQuery, UserRepository},
+    value_objects::{SocialIdentity, UserId},
+};
+
+use super::ActivityPubPort;
+
+pub struct CompositeSocialAdapter {
+    ap_service: Arc<dyn ActivityPubPort>,
+    user_repo: Arc<dyn UserRepository>,
+    base_url: String,
+}
+
+impl CompositeSocialAdapter {
+    pub fn new(
+        ap_service: Arc<dyn ActivityPubPort>,
+        user_repo: Arc<dyn UserRepository>,
+        base_url: String,
+    ) -> Self {
+        Self {
+            ap_service,
+            user_repo,
+            base_url,
+        }
+    }
+
+    fn local_actor_url(&self, user_id: &UserId) -> String {
+        format!("{}/users/{}", self.base_url, user_id.value())
+    }
+
+    fn actor_url_from_identity(&self, identity: &SocialIdentity) -> String {
+        match identity {
+            SocialIdentity::Local(uid) => self.local_actor_url(uid),
+            SocialIdentity::Remote { actor_url } => actor_url.clone(),
+        }
+    }
+
+    fn identity_from_actor_url(&self, url: &str) -> SocialIdentity {
+        let prefix = format!("{}/users/", self.base_url);
+        if let Some(uuid_str) = url.strip_prefix(&prefix)
+            && let Ok(uuid) = uuid::Uuid::parse_str(uuid_str)
+        {
+            return SocialIdentity::Local(UserId::from_uuid(uuid));
+        }
+        SocialIdentity::Remote {
+            actor_url: url.to_string(),
+        }
+    }
+
+    async fn resolve_handle(&self, identity: &SocialIdentity) -> Result<String, DomainError> {
+        match identity {
+            SocialIdentity::Local(uid) => {
+                let user = self
+                    .user_repo
+                    .find_by_id(uid)
+                    .await?
+                    .ok_or_else(|| DomainError::NotFound("User not found".into()))?;
+                let host = url::Url::parse(&self.base_url)
+                    .map(|u| u.host_str().unwrap_or("localhost").to_string())
+                    .unwrap_or_else(|_| "localhost".to_string());
+                Ok(format!("@{}@{}", user.username().value(), host))
+            }
+            SocialIdentity::Remote { actor_url } => Ok(actor_url.clone()),
+        }
+    }
+}
+
+fn ap_err(e: anyhow::Error) -> DomainError {
+    DomainError::InfrastructureError(e.to_string())
+}
+
+#[async_trait]
+impl SocialCommand for CompositeSocialAdapter {
+    async fn follow(
+        &self,
+        follower: &UserId,
+        target: &SocialIdentity,
+    ) -> Result<(), DomainError> {
+        if let SocialIdentity::Local(target_id) = target
+            && follower == target_id
+        {
+            return Err(DomainError::ValidationError(
+                "Cannot follow yourself".into(),
+            ));
+        }
+        let handle = self.resolve_handle(target).await?;
+        self.ap_service
+            .follow(follower.value(), &handle)
+            .await
+            .map_err(ap_err)
+    }
+
+    async fn unfollow(
+        &self,
+        follower: &UserId,
+        target: &SocialIdentity,
+    ) -> Result<(), DomainError> {
+        let actor_url = self.actor_url_from_identity(target);
+        self.ap_service
+            .unfollow(follower.value(), &actor_url)
+            .await
+            .map_err(ap_err)
+    }
+
+    async fn accept_follow(
+        &self,
+        owner: &UserId,
+        requester: &SocialIdentity,
+    ) -> Result<(), DomainError> {
+        let actor_url = self.actor_url_from_identity(requester);
+        self.ap_service
+            .accept_follower(owner.value(), &actor_url)
+            .await
+            .map_err(ap_err)
+    }
+
+    async fn reject_follow(
+        &self,
+        owner: &UserId,
+        requester: &SocialIdentity,
+    ) -> Result<(), DomainError> {
+        let actor_url = self.actor_url_from_identity(requester);
+        self.ap_service
+            .reject_follower(owner.value(), &actor_url)
+            .await
+            .map_err(ap_err)
+    }
+
+    async fn remove_follower(
+        &self,
+        owner: &UserId,
+        follower: &SocialIdentity,
+    ) -> Result<(), DomainError> {
+        let actor_url = self.actor_url_from_identity(follower);
+        self.ap_service
+            .remove_follower(owner.value(), &actor_url)
+            .await
+            .map_err(ap_err)
+    }
+
+    async fn block(
+        &self,
+        blocker: &UserId,
+        target: &SocialIdentity,
+    ) -> Result<(), DomainError> {
+        let actor_url = self.actor_url_from_identity(target);
+        self.ap_service
+            .block_actor(blocker.value(), &actor_url)
+            .await
+            .map_err(ap_err)
+    }
+
+    async fn unblock(
+        &self,
+        blocker: &UserId,
+        target: &SocialIdentity,
+    ) -> Result<(), DomainError> {
+        let actor_url = self.actor_url_from_identity(target);
+        self.ap_service
+            .unblock_actor(blocker.value(), &actor_url)
+            .await
+            .map_err(ap_err)
+    }
+}
+
+#[async_trait]
+impl SocialQuery for CompositeSocialAdapter {
+    async fn get_following(
+        &self,
+        user: &UserId,
+    ) -> Result<Vec<SocialIdentity>, DomainError> {
+        let actors = self
+            .ap_service
+            .get_following(user.value())
+            .await
+            .map_err(ap_err)?;
+        Ok(actors
+            .into_iter()
+            .map(|a| self.identity_from_actor_url(&a.url))
+            .collect())
+    }
+
+    async fn get_followers(
+        &self,
+        user: &UserId,
+    ) -> Result<Vec<SocialIdentity>, DomainError> {
+        let actors = self
+            .ap_service
+            .get_accepted_followers(user.value())
+            .await
+            .map_err(ap_err)?;
+        Ok(actors
+            .into_iter()
+            .map(|a| self.identity_from_actor_url(&a.url))
+            .collect())
+    }
+
+    async fn get_pending_followers(
+        &self,
+        user: &UserId,
+    ) -> Result<Vec<SocialIdentity>, DomainError> {
+        let actors = self
+            .ap_service
+            .get_pending_followers(user.value())
+            .await
+            .map_err(ap_err)?;
+        Ok(actors
+            .into_iter()
+            .map(|a| self.identity_from_actor_url(&a.url))
+            .collect())
+    }
+
+    async fn count_following(&self, user: &UserId) -> Result<usize, DomainError> {
+        self.ap_service
+            .count_following(user.value())
+            .await
+            .map_err(ap_err)
+    }
+
+    async fn count_followers(&self, user: &UserId) -> Result<usize, DomainError> {
+        self.ap_service
+            .count_accepted_followers(user.value())
+            .await
+            .map_err(ap_err)
+    }
+
+    async fn get_blocked(
+        &self,
+        user: &UserId,
+    ) -> Result<Vec<SocialIdentity>, DomainError> {
+        let actors = self
+            .ap_service
+            .get_blocked_actors(user.value())
+            .await
+            .map_err(ap_err)?;
+        Ok(actors
+            .into_iter()
+            .map(|a| self.identity_from_actor_url(&a.url))
+            .collect())
+    }
+
+    async fn is_following(
+        &self,
+        follower: &UserId,
+        target: &SocialIdentity,
+    ) -> Result<bool, DomainError> {
+        let following = self.get_following(follower).await?;
+        Ok(following.contains(target))
+    }
+}