From c62671116c71a7eaf1aaf13067fa8f5ef9e2f784 Mon Sep 17 00:00:00 2001
From: Dessalines <dessalines@users.noreply.github.com>
Date: Thu, 28 Jul 2022 11:49:26 -0400
Subject: [PATCH] Send websocket message on accepted follow. Fixes #2369
 (#2375)

---
 .../apub/src/activities/following/accept.rs   | 38 ++++++++++++++++---
 1 file changed, 33 insertions(+), 5 deletions(-)

diff --git a/crates/apub/src/activities/following/accept.rs b/crates/apub/src/activities/following/accept.rs
index 34764264e..f964da086 100644
--- a/crates/apub/src/activities/following/accept.rs
+++ b/crates/apub/src/activities/following/accept.rs
@@ -11,10 +11,12 @@ use activitypub_federation::{
   utils::verify_urls_match,
 };
 use activitystreams_kinds::activity::AcceptType;
-use lemmy_api_common::utils::blocking;
+use lemmy_api_common::{community::CommunityResponse, utils::blocking};
 use lemmy_db_schema::{source::community::CommunityFollower, traits::Followable};
+use lemmy_db_views::structs::LocalUserView;
+use lemmy_db_views_actor::structs::CommunityView;
 use lemmy_utils::error::LemmyError;
-use lemmy_websocket::LemmyContext;
+use lemmy_websocket::{messages::SendUserRoomMessage, LemmyContext, UserOperation};
 use url::Url;
 
 impl AcceptFollowCommunity {
@@ -76,21 +78,47 @@ impl ActivityHandler for AcceptFollowCommunity {
     context: &Data<LemmyContext>,
     request_counter: &mut i32,
   ) -> Result<(), LemmyError> {
-    let person = self
+    let community = self
       .actor
       .dereference(context, local_instance(context), request_counter)
       .await?;
-    let community = self
+    let person = self
       .object
       .actor
       .dereference(context, local_instance(context), request_counter)
       .await?;
     // This will throw an error if no follow was requested
+    let community_id = community.id;
+    let person_id = person.id;
     blocking(context.pool(), move |conn| {
-      CommunityFollower::follow_accepted(conn, person.id, community.id)
+      CommunityFollower::follow_accepted(conn, community_id, person_id)
     })
     .await??;
 
+    // Send the Subscribed message over websocket
+    // Re-read the community_view to get the new SubscribedType
+    let community_view = blocking(context.pool(), move |conn| {
+      CommunityView::read(conn, community_id, Some(person_id))
+    })
+    .await??;
+
+    // Get the local_user_id
+    let local_recipient_id = blocking(context.pool(), move |conn| {
+      LocalUserView::read_person(conn, person_id)
+    })
+    .await??
+    .local_user
+    .id;
+
+    let response = CommunityResponse { community_view };
+
+    context.chat_server().do_send(SendUserRoomMessage {
+      op: UserOperation::FollowCommunity,
+      response,
+      local_recipient_id,
+      websocket_id: None,
+    });
+
     Ok(())
   }
 }