separation of activitypub

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

@@ -0,0 +1,71 @@
+use activitypub_federation::{axum::json::FederationJson, config::Data};
+use axum::extract::Path;
+use serde_json::json;
+
+use crate::data::FederationData;
+use crate::error::Error;
+use crate::repository::FollowerStatus;
+
+fn ordered_collection(id: String, total: usize, items: Vec<String>) -> serde_json::Value {
+    json!({
+        "@context": "https://www.w3.org/ns/activitystreams",
+        "type": "OrderedCollection",
+        "id": id,
+        "totalItems": total,
+        "orderedItems": items,
+    })
+}
+
+pub async fn followers_handler(
+    Path(user_id_str): Path<String>,
+    data: Data<FederationData>,
+) -> Result<FederationJson<serde_json::Value>, Error> {
+    let user_id = uuid::Uuid::parse_str(&user_id_str)
+        .map_err(|_| Error::bad_request(anyhow::anyhow!("invalid user id")))?;
+
+    data.user_repo
+        .find_by_id(user_id)
+        .await
+        .map_err(Error::from)?
+        .ok_or_else(|| Error::not_found(anyhow::anyhow!("user not found")))?;
+
+    let followers = data
+        .federation_repo
+        .get_followers(user_id)
+        .await
+        .map_err(Error::from)?;
+
+    let items: Vec<String> = followers
+        .into_iter()
+        .filter(|f| f.status == FollowerStatus::Accepted)
+        .map(|f| f.actor.url)
+        .collect();
+
+    let id = format!("{}/users/{}/followers", data.base_url, user_id_str);
+    Ok(FederationJson(ordered_collection(id, items.len(), items)))
+}
+
+pub async fn following_handler(
+    Path(user_id_str): Path<String>,
+    data: Data<FederationData>,
+) -> Result<FederationJson<serde_json::Value>, Error> {
+    let user_id = uuid::Uuid::parse_str(&user_id_str)
+        .map_err(|_| Error::bad_request(anyhow::anyhow!("invalid user id")))?;
+
+    data.user_repo
+        .find_by_id(user_id)
+        .await
+        .map_err(Error::from)?
+        .ok_or_else(|| Error::not_found(anyhow::anyhow!("user not found")))?;
+
+    let following = data
+        .federation_repo
+        .get_following(user_id)
+        .await
+        .map_err(Error::from)?;
+
+    let items: Vec<String> = following.into_iter().map(|a| a.url).collect();
+
+    let id = format!("{}/users/{}/following", data.base_url, user_id_str);
+    Ok(FederationJson(ordered_collection(id, items.len(), items)))
+}