Remove follow community traits (#3737)

* chore(FollowCommunity): remove Perform and Send Activity traits

* chore(FollowCommunity): avoid fetching community and person from db

crates/api/src/community/follow.rs

@@ -1,8 +1,9 @@
-use crate::Perform;
-use actix_web::web::Data;
+use activitypub_federation::config::Data;
+use actix_web::web::Json;
 use lemmy_api_common::{
   community::{CommunityResponse, FollowCommunity},
   context::LemmyContext,
+  send_activity::{ActivityChannel, SendActivityData},
   utils::{check_community_ban, check_community_deleted_or_removed, local_user_view_from_jwt},
 };
 use lemmy_db_schema::{
@@ -15,54 +16,56 @@ use lemmy_db_schema::{
 use lemmy_db_views_actor::structs::CommunityView;
 use lemmy_utils::error::{LemmyError, LemmyErrorExt, LemmyErrorType};
 
-#[async_trait::async_trait(?Send)]
-impl Perform for FollowCommunity {
-  type Response = CommunityResponse;
+#[tracing::instrument(skip(context))]
+pub async fn follow_community(
+  data: Json<FollowCommunity>,
+  context: Data<LemmyContext>,
+) -> Result<Json<CommunityResponse>, LemmyError> {
+  let local_user_view = local_user_view_from_jwt(&data.auth, &context).await?;
 
-  #[tracing::instrument(skip(context))]
-  async fn perform(&self, context: &Data<LemmyContext>) -> Result<CommunityResponse, LemmyError> {
-    let data: &FollowCommunity = self;
-    let local_user_view = local_user_view_from_jwt(&data.auth, context).await?;
+  let community = Community::read(&mut context.pool(), data.community_id).await?;
+  let mut community_follower_form = CommunityFollowerForm {
+    community_id: community.id,
+    person_id: local_user_view.person.id,
+    pending: false,
+  };
 
-    let community_id = data.community_id;
-    let community = Community::read(&mut context.pool(), community_id).await?;
-    let mut community_follower_form = CommunityFollowerForm {
-      community_id: data.community_id,
-      person_id: local_user_view.person.id,
-      pending: false,
-    };
+  if data.follow {
+    if community.local {
+      check_community_ban(local_user_view.person.id, community.id, &mut context.pool()).await?;
+      check_community_deleted_or_removed(community.id, &mut context.pool()).await?;
 
-    if data.follow {
-      if community.local {
-        check_community_ban(local_user_view.person.id, community_id, &mut context.pool()).await?;
-        check_community_deleted_or_removed(community_id, &mut context.pool()).await?;
-
-        CommunityFollower::follow(&mut context.pool(), &community_follower_form)
-          .await
-          .with_lemmy_type(LemmyErrorType::CommunityFollowerAlreadyExists)?;
-      } else {
-        // Mark as pending, the actual federation activity is sent via `SendActivity` handler
-        community_follower_form.pending = true;
-        CommunityFollower::follow(&mut context.pool(), &community_follower_form)
-          .await
-          .with_lemmy_type(LemmyErrorType::CommunityFollowerAlreadyExists)?;
-      }
-    }
-    if !data.follow {
-      CommunityFollower::unfollow(&mut context.pool(), &community_follower_form)
+      CommunityFollower::follow(&mut context.pool(), &community_follower_form)
+        .await
+        .with_lemmy_type(LemmyErrorType::CommunityFollowerAlreadyExists)?;
+    } else {
+      // Mark as pending, the actual federation activity is sent via `SendActivity` handler
+      community_follower_form.pending = true;
+      CommunityFollower::follow(&mut context.pool(), &community_follower_form)
         .await
         .with_lemmy_type(LemmyErrorType::CommunityFollowerAlreadyExists)?;
     }
-
-    let community_id = data.community_id;
-    let person_id = local_user_view.person.id;
-    let community_view =
-      CommunityView::read(&mut context.pool(), community_id, Some(person_id), None).await?;
-    let discussion_languages = CommunityLanguage::read(&mut context.pool(), community_id).await?;
-
-    Ok(Self::Response {
-      community_view,
-      discussion_languages,
-    })
   }
+  if !data.follow {
+    CommunityFollower::unfollow(&mut context.pool(), &community_follower_form)
+      .await
+      .with_lemmy_type(LemmyErrorType::CommunityFollowerAlreadyExists)?;
+  }
+
+  ActivityChannel::submit_activity(
+    SendActivityData::FollowCommunity(community, local_user_view.person.clone(), data.follow),
+    &context,
+  )
+  .await?;
+
+  let community_id = data.community_id;
+  let person_id = local_user_view.person.id;
+  let community_view =
+    CommunityView::read(&mut context.pool(), community_id, Some(person_id), None).await?;
+  let discussion_languages = CommunityLanguage::read(&mut context.pool(), community_id).await?;
+
+  Ok(Json(CommunityResponse {
+    community_view,
+    discussion_languages,
+  }))
 }

crates/api/src/community/mod.rs

@@ -1,6 +1,6 @@
 mod add_mod;
 mod ban;
 mod block;
-mod follow;
+pub mod follow;
 mod hide;
 mod transfer;

crates/api_common/src/send_activity.rs

@@ -31,6 +31,7 @@ pub enum SendActivityData {
   RemoveComment(Comment, Person, Community, Option<String>),
   UpdateComment(Comment),
   LikePostOrComment(DbUrl, Person, Community, i16),
+  FollowCommunity(Community, Person, bool),
 }
 
 // TODO: instead of static, move this into LemmyContext. make sure that stopping the process with

crates/apub/src/activities/following/mod.rs

@@ -1,41 +1,27 @@
 use crate::{
-  objects::community::ApubCommunity,
+  objects::{community::ApubCommunity, person::ApubPerson},
   protocol::activities::following::{follow::Follow, undo_follow::UndoFollow},
-  SendActivity,
 };
 use activitypub_federation::config::Data;
-use lemmy_api_common::{
-  community::{CommunityResponse, FollowCommunity},
-  context::LemmyContext,
-  utils::local_user_view_from_jwt,
-};
-use lemmy_db_schema::{source::community::Community, traits::Crud};
+use lemmy_api_common::context::LemmyContext;
+use lemmy_db_schema::source::{community::Community, person::Person};
 use lemmy_utils::error::LemmyError;
 
 pub mod accept;
 pub mod follow;
 pub mod undo_follow;
 
-#[async_trait::async_trait]
-impl SendActivity for FollowCommunity {
-  type Response = CommunityResponse;
-
-  async fn send_activity(
-    request: &Self,
-    _response: &Self::Response,
-    context: &Data<LemmyContext>,
-  ) -> Result<(), LemmyError> {
-    let local_user_view = local_user_view_from_jwt(&request.auth, context).await?;
-    let person = local_user_view.person.clone().into();
-    let community: ApubCommunity = Community::read(&mut context.pool(), request.community_id)
-      .await?
-      .into();
-    if community.local {
-      Ok(())
-    } else if request.follow {
-      Follow::send(&person, &community, context).await
-    } else {
-      UndoFollow::send(&person, &community, context).await
-    }
+pub async fn send_follow_community(
+  community: Community,
+  person: Person,
+  follow: bool,
+  context: &Data<LemmyContext>,
+) -> Result<(), LemmyError> {
+  let community: ApubCommunity = community.into();
+  let actor: ApubPerson = person.into();
+  if follow {
+    Follow::send(&actor, &community, context).await
+  } else {
+    UndoFollow::send(&actor, &community, context).await
   }
 }

crates/apub/src/activities/mod.rs

@@ -1,3 +1,4 @@
+use self::following::send_follow_community;
 use crate::{
   activities::{
     deletion::{send_apub_delete_in_community, DeletableObjects},
@@ -250,6 +251,9 @@ pub async fn match_outgoing_activities(
       LikePostOrComment(object_id, person, community, score) => {
         send_like_activity(object_id, person, community, score, context).await
       }
+      SendActivityData::FollowCommunity(community, person, follow) => {
+        send_follow_community(community, person, follow, &context).await
+      }
     }
   };
   if *SYNCHRONOUS_FEDERATION {

src/api_routes_http.rs

@@ -2,6 +2,7 @@ use actix_web::{guard, web, Error, HttpResponse, Result};
 use lemmy_api::{
   comment::{distinguish::distinguish_comment, like::like_comment, save::save_comment},
   comment_report::{list::list_comment_reports, resolve::resolve_comment_report},
+  community::follow::follow_community,
   local_user::notifications::mark_reply_read::mark_reply_as_read,
   post::like::like_post,
   Perform,
@@ -15,7 +16,6 @@ use lemmy_api_common::{
     CreateCommunity,
     DeleteCommunity,
     EditCommunity,
-    FollowCommunity,
     HideCommunity,
     RemoveCommunity,
     TransferCommunity,
@@ -146,7 +146,7 @@ pub fn config(cfg: &mut web::ServiceConfig, rate_limit: &RateLimitCell) {
           .route("", web::put().to(route_post_crud::<EditCommunity>))
           .route("/hide", web::put().to(route_post::<HideCommunity>))
           .route("/list", web::get().to(list_communities))
-          .route("/follow", web::post().to(route_post::<FollowCommunity>))
+          .route("/follow", web::post().to(follow_community))
           .route("/block", web::post().to(route_post::<BlockCommunity>))
           .route(
             "/delete",