Restore Activitypub audience field (#6157)

* Restore Activitypub audience field

I previously removed this in #5315
because it wasnt used much. However it seems that since then
[NodeBB and Piefed](https://activitypub.space/topic/63/lemmy-s-removal-of-audience-in-posts)
have adopted it, and so it should be kept. Additionally it is part
of [FEP-1b12](https://codeberg.org/fediverse/fep/src/branch/main/fep/1b12/fep-1b12.md).

* test fixes

* x

Author: Nutomic

crates/apub/activities/src/block/block_user.rs

@@ -62,6 +62,7 @@ impl BlockUser {
       summary: Some(reason),
       id: generate_activity_id(BlockType::Block, context)?,
       end_time: expires,
+      audience: target.as_ref().right().map(|c| c.ap_id.clone().into()),
     })
   }
 

crates/apub/activities/src/block/undo_block_user.rs

@@ -56,6 +56,7 @@ impl UndoBlockUser {
       kind: UndoType::Undo,
       id: id.clone(),
       restore_data: Some(restore_data),
+      audience: target.as_ref().right().map(|c| c.ap_id.clone().into()),
     };
 
     let mut inboxes = ActivitySendTargets::to_inbox(user.shared_inbox_or_inbox());

crates/apub/activities/src/community/collection_add.rs

@@ -54,6 +54,7 @@ impl CollectionAdd {
       cc: vec![community.id().clone()],
       kind: AddType::Add,
       id: id.clone(),
+      audience: Some(community.ap_id.clone().into()),
     };
 
     let activity = AnnouncableActivities::CollectionAdd(add);
@@ -76,6 +77,7 @@ impl CollectionAdd {
       cc: vec![community.id().clone()],
       kind: AddType::Add,
       id: id.clone(),
+      audience: Some(community.ap_id.clone().into()),
     };
     let activity = AnnouncableActivities::CollectionAdd(add);
     send_activity_in_community(

crates/apub/activities/src/community/collection_remove.rs

@@ -51,6 +51,7 @@ impl CollectionRemove {
       id: id.clone(),
       cc: vec![community.id().clone()],
       kind: RemoveType::Remove,
+      audience: Some(community.ap_id.clone().into()),
     };
 
     let activity = AnnouncableActivities::CollectionRemove(remove);
@@ -73,6 +74,7 @@ impl CollectionRemove {
       cc: vec![community.id().clone()],
       kind: RemoveType::Remove,
       id: id.clone(),
+      audience: Some(community.ap_id.clone().into()),
     };
     let activity = AnnouncableActivities::CollectionRemove(remove);
     send_activity_in_community(

crates/apub/activities/src/community/lock.rs

@@ -163,6 +163,7 @@ pub(crate) async fn send_lock(
     kind: LockType::Lock,
     id,
     summary: Some(reason.clone()),
+    audience: Some(community.ap_id.clone().into()),
   };
   let activity = if locked {
     AnnouncableActivities::Lock(lock)
@@ -176,6 +177,7 @@ pub(crate) async fn send_lock(
       id,
       object: lock,
       summary: Some(reason),
+      audience: Some(community.ap_id.clone().into()),
     };
     AnnouncableActivities::UndoLock(undo)
   };

crates/apub/activities/src/community/report.rs

@@ -62,6 +62,7 @@ impl Report {
       content: None,
       kind,
       id: id.clone(),
+      audience: receiver.as_ref().right().map(|c| c.ap_id.clone().into()),
     })
   }
 

crates/apub/activities/src/community/resolve_report.rs

@@ -55,6 +55,7 @@ impl ResolveReport {
       object,
       kind,
       id: id.clone(),
+      audience: receiver.as_ref().right().map(|c| c.ap_id.clone().into()),
     };
     let inboxes = report_inboxes(object_id, receiver, report_creator, &context).await?;
 

crates/apub/activities/src/community/update.rs

@@ -43,6 +43,7 @@ pub(crate) async fn send_update_community(
     cc: vec![community.id().clone()],
     kind: UpdateType::Update,
     id: id.clone(),
+    audience: Some(community.ap_id.clone().into()),
   };
 
   let activity = AnnouncableActivities::UpdateCommunity(Box::new(update));
@@ -72,6 +73,7 @@ pub(crate) async fn send_update_multi_community(
     cc: vec![],
     kind: UpdateType::Update,
     id: id.clone(),
+    audience: Some(multi.ap_id.clone().into()),
   };
 
   let activity = AnnouncableActivities::UpdateCommunity(Box::new(update));

crates/apub/activities/src/create_or_update/comment.rs

@@ -68,6 +68,7 @@ impl CreateOrUpdateNote {
       object: note,
       kind,
       id: id.clone(),
+      audience: Some(community.ap_id.clone().into()),
     };
 
     let tagged_users: Vec<ObjectId<ApubPerson>> = create_or_update

crates/apub/activities/src/create_or_update/post.rs

@@ -54,6 +54,7 @@ impl CreateOrUpdatePage {
       cc: vec![community.id().clone()],
       kind,
       id: id.clone(),
+      audience: Some(community.ap_id.clone().into()),
     })
   }