Implement federated bans (fixes #1298)

crates/api/src/community.rs

@@ -134,6 +134,15 @@ impl Perform for BanFromCommunity {
       person_id: data.person_id,
     };
 
+    let community = blocking(context.pool(), move |conn: &'_ _| {
+      Community::read(conn, community_id)
+    })
+    .await??;
+    let banned_person = blocking(context.pool(), move |conn: &'_ _| {
+      Person::read(conn, banned_person_id)
+    })
+    .await??;
+
     if data.ban {
       let ban = move |conn: &'_ _| CommunityPersonBan::ban(conn, &community_user_ban_form);
       if blocking(context.pool(), ban).await?.is_err() {
@@ -151,11 +160,17 @@ impl Perform for BanFromCommunity {
       })
       .await?
       .ok();
+      community
+        .send_block_user(&local_user_view.person, banned_person, context)
+        .await?;
     } else {
       let unban = move |conn: &'_ _| CommunityPersonBan::unban(conn, &community_user_ban_form);
       if blocking(context.pool(), unban).await?.is_err() {
         return Err(ApiError::err("community_user_already_banned").into());
       }
+      community
+        .send_undo_block_user(&local_user_view.person, banned_person, context)
+        .await?;
     }
 
     // Remove/Restore their data if that's desired

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

@@ -11,11 +11,21 @@ use crate::{
 };
 use activitystreams::{
   activity::{
-    kind::{AcceptType, AddType, AnnounceType, DeleteType, LikeType, RemoveType, UndoType},
+    kind::{
+      AcceptType,
+      AddType,
+      AnnounceType,
+      BlockType,
+      DeleteType,
+      LikeType,
+      RemoveType,
+      UndoType,
+    },
     Accept,
     ActorAndObjectRefExt,
     Add,
     Announce,
+    Block,
     Delete,
     Follow,
     OptTargetRefExt,
@@ -170,7 +180,7 @@ impl CommunityType for Community {
       insert_activity(inner_id, activity.clone(), true, false, context.pool()).await?;
     }
 
-    let mut announce = Announce::new(self.actor_id.to_owned().into_inner(), activity);
+    let mut announce = Announce::new(self.actor_id(), activity);
     announce
       .set_many_contexts(lemmy_context()?)
       .set_id(generate_activity_id(AnnounceType::Announce)?)
@@ -209,10 +219,7 @@ impl CommunityType for Community {
     added_mod: Person,
     context: &LemmyContext,
   ) -> Result<(), LemmyError> {
-    let mut add = Add::new(
-      actor.actor_id.clone().into_inner(),
-      added_mod.actor_id.into_inner(),
-    );
+    let mut add = Add::new(actor.actor_id(), added_mod.actor_id());
     add
       .set_many_contexts(lemmy_context()?)
       .set_id(generate_activity_id(AddType::Add)?)
@@ -230,10 +237,7 @@ impl CommunityType for Community {
     removed_mod: Person,
     context: &LemmyContext,
   ) -> Result<(), LemmyError> {
-    let mut remove = Remove::new(
-      actor.actor_id.clone().into_inner(),
-      removed_mod.actor_id.into_inner(),
-    );
+    let mut remove = Remove::new(actor.actor_id(), removed_mod.actor_id());
     remove
       .set_many_contexts(lemmy_context()?)
       .set_id(generate_activity_id(RemoveType::Remove)?)
@@ -244,4 +248,46 @@ impl CommunityType for Community {
     send_to_community(remove, &actor, self, context).await?;
     Ok(())
   }
+
+  // / TODO: also need to implement the Undo for this
+  async fn send_block_user(
+    &self,
+    actor: &Person,
+    blocked_user: Person,
+    context: &LemmyContext,
+  ) -> Result<(), LemmyError> {
+    let mut block = Block::new(actor.actor_id(), blocked_user.actor_id());
+    block
+      .set_many_contexts(lemmy_context()?)
+      .set_id(generate_activity_id(BlockType::Block)?)
+      .set_to(public())
+      .set_many_ccs(vec![self.actor_id()]);
+
+    send_to_community(block, &actor, self, context).await?;
+    Ok(())
+  }
+
+  async fn send_undo_block_user(
+    &self,
+    actor: &Person,
+    blocked_user: Person,
+    context: &LemmyContext,
+  ) -> Result<(), LemmyError> {
+    let mut block = Block::new(actor.actor_id(), blocked_user.actor_id());
+    block
+      .set_many_contexts(lemmy_context()?)
+      .set_id(generate_activity_id(BlockType::Block)?)
+      .set_to(public())
+      .set_many_ccs(vec![self.actor_id()]);
+
+    // Undo that fake activity
+    let mut undo = Undo::new(actor.actor_id(), block.into_any_base()?);
+    undo
+      .set_many_contexts(lemmy_context()?)
+      .set_id(generate_activity_id(UndoType::Undo)?)
+      .set_to(public())
+      .set_many_ccs(vec![self.followers_url.clone().into_inner()]);
+    send_to_community(undo, &actor, self, context).await?;
+    Ok(())
+  }
 }

crates/apub/src/activities/send/person.rs

@@ -74,7 +74,7 @@ impl UserType for Person {
     })
     .await?;
 
-    let mut follow = Follow::new(self.actor_id.to_owned().into_inner(), community.actor_id());
+    let mut follow = Follow::new(self.actor_id(), community.actor_id());
     follow
       .set_many_contexts(lemmy_context()?)
       .set_id(generate_activity_id(FollowType::Follow)?)
@@ -95,7 +95,7 @@ impl UserType for Person {
     })
     .await??;
 
-    let mut follow = Follow::new(self.actor_id.to_owned().into_inner(), community.actor_id());
+    let mut follow = Follow::new(self.actor_id(), community.actor_id());
     follow
       .set_many_contexts(lemmy_context()?)
       .set_id(generate_activity_id(FollowType::Follow)?)

crates/apub/src/lib.rs

@@ -222,6 +222,19 @@ pub trait CommunityType {
     removed_mod: Person,
     context: &LemmyContext,
   ) -> Result<(), LemmyError>;
+
+  async fn send_block_user(
+    &self,
+    actor: &Person,
+    blocked_user: Person,
+    context: &LemmyContext,
+  ) -> Result<(), LemmyError>;
+  async fn send_undo_block_user(
+    &self,
+    actor: &Person,
+    blocked_user: Person,
+    context: &LemmyContext,
+  ) -> Result<(), LemmyError>;
 }
 
 #[async_trait::async_trait(?Send)]

crates/apub_receive/src/inbox/community_inbox.rs

@@ -7,6 +7,7 @@ use crate::{
     is_activity_already_known,
     receive_for_community::{
       receive_add_for_community,
+      receive_block_user_for_community,
       receive_create_for_community,
       receive_delete_for_community,
       receive_dislike_for_community,
@@ -58,6 +59,7 @@ pub enum CommunityValidTypes {
   Delete,  // post or comment deleted by creator
   Remove,  // post or comment removed by mod or admin, or mod removed from community
   Add,     // mod added to community
+  Block,   // user blocked by community
 }
 
 pub type CommunityAcceptedActivities = ActorAndObject<CommunityValidTypes>;
@@ -224,6 +226,16 @@ pub(crate) async fn community_receive_message(
       .await?;
       true
     }
+    CommunityValidTypes::Block => {
+      Box::pin(receive_block_user_for_community(
+        context,
+        any_base.clone(),
+        None,
+        request_counter,
+      ))
+      .await?;
+      true
+    }
   };
 
   if do_announce {

crates/apub_receive/src/inbox/person_inbox.rs

@@ -25,6 +25,7 @@ use crate::{
     is_addressed_to_local_person,
     receive_for_community::{
       receive_add_for_community,
+      receive_block_user_for_community,
       receive_create_for_community,
       receive_delete_for_community,
       receive_dislike_for_community,
@@ -276,6 +277,7 @@ enum AnnouncableActivities {
   Remove,
   Undo,
   Add,
+  Block,
 }
 
 /// Takes an announce and passes the inner activity to the appropriate handler.
@@ -352,6 +354,10 @@ pub async fn receive_announce(
     Some(Add) => {
       receive_add_for_community(context, inner_activity, Some(announce), request_counter).await
     }
+    Some(Block) => {
+      receive_block_user_for_community(context, inner_activity, Some(announce), request_counter)
+        .await
+    }
     _ => receive_unhandled_activity(inner_activity),
   }
 }

crates/apub_receive/src/inbox/receive_for_community.rs

@@ -38,6 +38,7 @@ use activitystreams::{
     ActorAndObjectRef,
     Add,
     Announce,
+    Block,
     Create,
     Delete,
     Dislike,
@@ -64,10 +65,25 @@ use lemmy_apub::{
   CommunityType,
   PostOrComment,
 };
-use lemmy_db_queries::{source::community::CommunityModerator_, ApubObject, Crud, Joinable};
+use lemmy_db_queries::{
+  source::community::CommunityModerator_,
+  ApubObject,
+  Bannable,
+  Crud,
+  Followable,
+  Joinable,
+};
 use lemmy_db_schema::{
   source::{
-    community::{Community, CommunityModerator, CommunityModeratorForm},
+    community::{
+      Community,
+      CommunityFollower,
+      CommunityFollowerForm,
+      CommunityModerator,
+      CommunityModeratorForm,
+      CommunityPersonBan,
+      CommunityPersonBanForm,
+    },
     person::Person,
     site::Site,
   },
@@ -271,6 +287,7 @@ enum UndoableActivities {
   Remove,
   Like,
   Dislike,
+  Block,
 }
 
 /// A post/comment action being reverted (either a delete, remove, upvote or downvote)
@@ -301,6 +318,16 @@ pub(in crate::inbox) async fn receive_undo_for_community(
     Some(Dislike) => {
       receive_undo_dislike_for_community(context, undo, expected_domain, request_counter).await
     }
+    Some(Block) => {
+      receive_undo_block_user_for_community(
+        context,
+        undo,
+        announce,
+        expected_domain,
+        request_counter,
+      )
+      .await
+    }
     _ => receive_unhandled_activity(undo),
   }
 }
@@ -451,6 +478,85 @@ pub(in crate::inbox) async fn receive_undo_dislike_for_community(
   }
 }
 
+pub(crate) async fn receive_block_user_for_community(
+  context: &LemmyContext,
+  block_any_base: AnyBase,
+  announce: Option<Announce>,
+  request_counter: &mut i32,
+) -> Result<(), LemmyError> {
+  let block = Block::from_any_base(block_any_base.to_owned())?.context(location_info!())?;
+  let community = extract_community_from_cc(&block, context).await?;
+
+  verify_mod_activity(&block, announce, &community, context).await?;
+  verify_is_addressed_to_public(&block)?;
+
+  let blocked_user = block
+    .object()
+    .as_single_xsd_any_uri()
+    .context(location_info!())?;
+  let blocked_user =
+    get_or_fetch_and_upsert_person(&blocked_user, context, request_counter).await?;
+
+  let community_user_ban_form = CommunityPersonBanForm {
+    community_id: community.id,
+    person_id: blocked_user.id,
+  };
+
+  blocking(context.pool(), move |conn: &'_ _| {
+    CommunityPersonBan::ban(conn, &community_user_ban_form)
+  })
+  .await??;
+
+  // Also unsubscribe them from the community, if they are subscribed
+  let community_follower_form = CommunityFollowerForm {
+    community_id: community.id,
+    person_id: blocked_user.id,
+    pending: false,
+  };
+  blocking(context.pool(), move |conn: &'_ _| {
+    CommunityFollower::unfollow(conn, &community_follower_form)
+  })
+  .await?
+  .ok();
+
+  Ok(())
+}
+
+pub(crate) async fn receive_undo_block_user_for_community(
+  context: &LemmyContext,
+  undo: Undo,
+  announce: Option<Announce>,
+  expected_domain: &Url,
+  request_counter: &mut i32,
+) -> Result<(), LemmyError> {
+  let object = undo.object().clone().one().context(location_info!())?;
+  let block = Block::from_any_base(object)?.context(location_info!())?;
+  let community = extract_community_from_cc(&block, context).await?;
+
+  verify_activity_domains_valid(&block, &expected_domain, false)?;
+  verify_is_addressed_to_public(&block)?;
+  verify_undo_remove_actor_instance(&undo, &block, &announce, context).await?;
+
+  let blocked_user = block
+    .object()
+    .as_single_xsd_any_uri()
+    .context(location_info!())?;
+  let blocked_user =
+    get_or_fetch_and_upsert_person(&blocked_user, context, request_counter).await?;
+
+  let community_user_ban_form = CommunityPersonBanForm {
+    community_id: community.id,
+    person_id: blocked_user.id,
+  };
+
+  blocking(context.pool(), move |conn: &'_ _| {
+    CommunityPersonBan::unban(conn, &community_user_ban_form)
+  })
+  .await??;
+
+  Ok(())
+}
+
 async fn fetch_post_or_comment_by_id(
   apub_id: &Url,
   context: &LemmyContext,