crates/adapters/activitypub-base/src/activities.rs

@@ -516,6 +516,12 @@ impl Activity for AnnounceActivity {
                 self.published.unwrap_or_else(chrono::Utc::now),
             )
             .await?;
+        data.object_handler
+            .on_announce_received(&self.object, self.actor.inner())
+            .await
+            .unwrap_or_else(|e| {
+                tracing::warn!(error = %e, "failed to process announce notification");
+            });
         tracing::info!(actor = %self.actor.inner(), object = %self.object, "received announce");
         Ok(())
     }
@@ -533,6 +539,45 @@ pub struct LikeActivity {
     pub object: Url,
 }
 
+#[async_trait::async_trait]
+impl Activity for LikeActivity {
+    type DataType = FederationData;
+    type Error = crate::error::Error;
+
+    fn id(&self) -> &Url {
+        &self.id
+    }
+
+    fn actor(&self) -> &Url {
+        self.actor.inner()
+    }
+
+    async fn verify(&self, _data: &Data<Self::DataType>) -> Result<(), Self::Error> {
+        Ok(())
+    }
+
+    async fn receive(self, data: &Data<Self::DataType>) -> Result<(), Self::Error> {
+        let domain = self.actor().host_str().unwrap_or("");
+        if data.federation_repo.is_domain_blocked(domain).await? {
+            tracing::info!(actor = %self.actor(), "ignoring Like from blocked domain");
+            return Ok(());
+        }
+
+        // Only process if the liked object is on our instance.
+        if self.object.host_str().unwrap_or("") != data.domain {
+            return Ok(());
+        }
+
+        data.object_handler
+            .on_like(&self.object, self.actor.inner())
+            .await
+            .map_err(|e| crate::error::Error::from(anyhow::anyhow!(e)))?;
+
+        tracing::info!(actor = %self.actor.inner(), object = %self.object, "received like");
+        Ok(())
+    }
+}
+
 // --- Add ---
 
 #[derive(Clone, Default, Debug, Serialize, Deserialize)]
@@ -664,4 +709,6 @@ pub enum InboxActivities {
     Add(AddActivity),
     #[serde(rename = "Block")]
     Block(BlockActivity),
+    #[serde(rename = "Like")]
+    Like(LikeActivity),
 }

crates/adapters/activitypub-base/src/service.rs

@@ -340,6 +340,105 @@ impl ActivityPubService {
         Ok(())
     }
 
+    /// Send a Like activity to a single inbox.
+    pub async fn broadcast_like_to_inbox(
+        &self,
+        liker_user_id: uuid::Uuid,
+        object_ap_id: url::Url,
+        author_inbox_url: url::Url,
+    ) -> anyhow::Result<()> {
+        let data = self.federation_config.to_request_data();
+        let local_actor = get_local_actor(liker_user_id, &data)
+            .await
+            .map_err(|e| anyhow::anyhow!("{e}"))?;
+
+        // Deterministic ID so Undo(Like) can reference the same activity.
+        let like_id = url::Url::parse(&format!(
+            "{}/activities/like/{}",
+            self.base_url,
+            uuid::Uuid::new_v5(
+                &uuid::Uuid::NAMESPACE_URL,
+                format!("{}/{}", liker_user_id, object_ap_id).as_bytes(),
+            )
+        ))?;
+
+        let like = crate::activities::LikeActivity {
+            id: like_id,
+            kind: Default::default(),
+            actor: ObjectId::from(local_actor.ap_id.clone()),
+            object: object_ap_id,
+        };
+
+        let sends = SendActivityTask::prepare(
+            &WithContext::new_default(like),
+            &local_actor,
+            vec![author_inbox_url],
+            &data,
+        )
+        .await?;
+        let failures = send_with_retry(sends, &data).await;
+        if !failures.is_empty() {
+            tracing::warn!(
+                count = failures.len(),
+                "some Like deliveries failed permanently"
+            );
+        }
+        Ok(())
+    }
+
+    /// Send an Undo(Like) activity to a single inbox.
+    pub async fn broadcast_undo_like_to_inbox(
+        &self,
+        liker_user_id: uuid::Uuid,
+        object_ap_id: url::Url,
+        author_inbox_url: url::Url,
+    ) -> anyhow::Result<()> {
+        let data = self.federation_config.to_request_data();
+        let local_actor = get_local_actor(liker_user_id, &data)
+            .await
+            .map_err(|e| anyhow::anyhow!("{e}"))?;
+
+        // Reconstruct the same deterministic like ID.
+        let like_id = url::Url::parse(&format!(
+            "{}/activities/like/{}",
+            self.base_url,
+            uuid::Uuid::new_v5(
+                &uuid::Uuid::NAMESPACE_URL,
+                format!("{}/{}", liker_user_id, object_ap_id).as_bytes(),
+            )
+        ))?;
+
+        let undo_id = activity_url(&self.base_url).map_err(|e| anyhow::anyhow!("{e}"))?;
+
+        let undo = crate::activities::UndoActivity {
+            id: undo_id,
+            kind: Default::default(),
+            actor: ObjectId::from(local_actor.ap_id.clone()),
+            object: serde_json::json!({
+                "type": "Like",
+                "id": like_id.to_string(),
+                "actor": local_actor.ap_id.to_string(),
+                "object": object_ap_id.to_string(),
+            }),
+        };
+
+        let sends = SendActivityTask::prepare(
+            &WithContext::new_default(undo),
+            &local_actor,
+            vec![author_inbox_url],
+            &data,
+        )
+        .await?;
+        let failures = send_with_retry(sends, &data).await;
+        if !failures.is_empty() {
+            tracing::warn!(
+                count = failures.len(),
+                "some Undo(Like) deliveries failed permanently"
+            );
+        }
+        Ok(())
+    }
+
     /// Resolve a `@user@domain` handle to a `DbActor` over HTTPS directly.
     /// The library's `webfinger_resolve_actor` tries HTTP first in debug mode, which breaks
     /// on servers that don't redirect HTTP → HTTPS.
@@ -1393,22 +1492,32 @@ impl domain::ports::OutboundFederationPort for ActivityPubService {
 
     async fn broadcast_like(
         &self,
-        _liker_user_id: &domain::value_objects::UserId,
-        _object_ap_id: &str,
-        _author_inbox_url: &str,
+        liker_user_id: &domain::value_objects::UserId,
+        object_ap_id: &str,
+        author_inbox_url: &str,
     ) -> Result<(), domain::errors::DomainError> {
-        // TODO: implement Like activity broadcasting
-        Ok(())
+        let object = url::Url::parse(object_ap_id)
+            .map_err(|e| domain::errors::DomainError::Internal(e.to_string()))?;
+        let inbox = url::Url::parse(author_inbox_url)
+            .map_err(|e| domain::errors::DomainError::Internal(e.to_string()))?;
+        self.broadcast_like_to_inbox(liker_user_id.as_uuid(), object, inbox)
+            .await
+            .map_err(|e| domain::errors::DomainError::Internal(e.to_string()))
     }
 
     async fn broadcast_undo_like(
         &self,
-        _liker_user_id: &domain::value_objects::UserId,
-        _object_ap_id: &str,
-        _author_inbox_url: &str,
+        liker_user_id: &domain::value_objects::UserId,
+        object_ap_id: &str,
+        author_inbox_url: &str,
     ) -> Result<(), domain::errors::DomainError> {
-        // TODO: implement Undo(Like) activity broadcasting
-        Ok(())
+        let object = url::Url::parse(object_ap_id)
+            .map_err(|e| domain::errors::DomainError::Internal(e.to_string()))?;
+        let inbox = url::Url::parse(author_inbox_url)
+            .map_err(|e| domain::errors::DomainError::Internal(e.to_string()))?;
+        self.broadcast_undo_like_to_inbox(liker_user_id.as_uuid(), object, inbox)
+            .await
+            .map_err(|e| domain::errors::DomainError::Internal(e.to_string()))
     }
 }