fix: content negotiation for followers/following — resolve AP router conflict

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

@@ -1415,6 +1415,102 @@ impl domain::ports::FederationActionPort for ActivityPubService {
             .await
             .map_err(|e| domain::errors::DomainError::ExternalService(e.to_string()))
     }
+
+    async fn followers_collection_json(
+        &self,
+        user_id: &domain::value_objects::UserId,
+        page: Option<u32>,
+    ) -> Result<String, domain::errors::DomainError> {
+        let data = self.federation_config.to_request_data();
+        let uuid = user_id.as_uuid();
+        let collection_id = format!("{}/users/{}/followers", self.base_url, uuid);
+        let total = data
+            .federation_repo
+            .count_followers(uuid)
+            .await
+            .map_err(|e| domain::errors::DomainError::ExternalService(e.to_string()))?;
+        let obj = if let Some(p) = page {
+            let p = p.max(1);
+            let offset = (p.saturating_sub(1) as usize) * 20;
+            let followers = data
+                .federation_repo
+                .get_followers_page(uuid, offset as u32, 20)
+                .await
+                .map_err(|e| domain::errors::DomainError::ExternalService(e.to_string()))?;
+            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": "https://www.w3.org/ns/activitystreams",
+                "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": "https://www.w3.org/ns/activitystreams",
+                "type": "OrderedCollection",
+                "id": collection_id,
+                "totalItems": total,
+                "first": format!("{}?page=1", collection_id),
+            })
+        };
+        serde_json::to_string(&obj)
+            .map_err(|e| domain::errors::DomainError::ExternalService(e.to_string()))
+    }
+
+    async fn following_collection_json(
+        &self,
+        user_id: &domain::value_objects::UserId,
+        page: Option<u32>,
+    ) -> Result<String, domain::errors::DomainError> {
+        let data = self.federation_config.to_request_data();
+        let uuid = user_id.as_uuid();
+        let collection_id = format!("{}/users/{}/following", self.base_url, uuid);
+        let total = data
+            .federation_repo
+            .count_following(uuid)
+            .await
+            .map_err(|e| domain::errors::DomainError::ExternalService(e.to_string()))?;
+        let obj = if let Some(p) = page {
+            let p = p.max(1);
+            let offset = (p.saturating_sub(1) as usize) * 20;
+            let following = data
+                .federation_repo
+                .get_following_page(uuid, offset as u32, 20)
+                .await
+                .map_err(|e| domain::errors::DomainError::ExternalService(e.to_string()))?;
+            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": "https://www.w3.org/ns/activitystreams",
+                "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": "https://www.w3.org/ns/activitystreams",
+                "type": "OrderedCollection",
+                "id": collection_id,
+                "totalItems": total,
+                "first": format!("{}?page=1", collection_id),
+            })
+        };
+        serde_json::to_string(&obj)
+            .map_err(|e| domain::errors::DomainError::ExternalService(e.to_string()))
+    }
 }
 
 #[cfg(test)]