Implement federated bans (fixes #1298) (#1553)

* Implement federated bans (fixes #1298)

* mod actions should always be federated to affected user, in addition to followers

* Make Undo/Block work for remote mods

* clippy fix

* fix federation test

* vscodium doesnt auto-save changes...

api_tests/src/post.spec.ts

@@ -340,17 +340,9 @@ test('Enforce community ban for federated user', async () => {
   let banAlpha = await banPersonFromCommunity(beta, alphaUser.person.id, 2, true);
   expect(banAlpha.banned).toBe(true);
 
-  // Alpha makes post on beta
+  // Alpha tries to make post on beta, but it fails because of ban
   let postRes = await createPost(alpha, betaCommunity.community.id);
-  expect(postRes.post_view.post).toBeDefined();
-  expect(postRes.post_view.community.local).toBe(false);
-  expect(postRes.post_view.creator.local).toBe(true);
-  expect(postRes.post_view.counts.score).toBe(1);
-
-  // Make sure that post doesn't make it to beta community
-  let searchBeta = await searchPostLocal(beta, postRes.post_view.post);
-  let betaPost = searchBeta.posts[0];
-  expect(betaPost).toBeUndefined();
+  expect(postRes.post_view).toBeUndefined();
 
   // Unban alpha
   let unBanAlpha = await banPersonFromCommunity(
@@ -360,4 +352,14 @@ test('Enforce community ban for federated user', async () => {
     false
   );
   expect(unBanAlpha.banned).toBe(false);
+  let postRes2 = await createPost(alpha, betaCommunity.community.id);
+  expect(postRes2.post_view.post).toBeDefined();
+  expect(postRes2.post_view.community.local).toBe(false);
+  expect(postRes2.post_view.creator.local).toBe(true);
+  expect(postRes2.post_view.counts.score).toBe(1);
+
+  // Make sure that post makes it to beta community
+  let searchBeta = await searchPostLocal(beta, postRes2.post_view.post);
+  let betaPost = searchBeta.posts[0];
+  expect(betaPost).toBeDefined();
 });

crates/api/src/community.rs

@@ -130,6 +130,15 @@ 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() {
@@ -147,11 +156,18 @@ 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/comment.rs

@@ -71,7 +71,7 @@ impl ApubObjectType for Comment {
       // Set the mention tags
       .set_many_tags(maa.get_tags()?);
 
-    send_to_community(create.clone(), &creator, &community, context).await?;
+    send_to_community(create.clone(), &creator, &community, None, context).await?;
     send_comment_mentions(&creator, maa.inboxes, create, context).await?;
     Ok(())
   }
@@ -104,7 +104,7 @@ impl ApubObjectType for Comment {
       // Set the mention tags
       .set_many_tags(maa.get_tags()?);
 
-    send_to_community(update.clone(), &creator, &community, context).await?;
+    send_to_community(update.clone(), &creator, &community, None, context).await?;
     send_comment_mentions(&creator, maa.inboxes, update, context).await?;
     Ok(())
   }
@@ -129,7 +129,7 @@ impl ApubObjectType for Comment {
       .set_to(public())
       .set_many_ccs(vec![community.actor_id()]);
 
-    send_to_community(delete, &creator, &community, context).await?;
+    send_to_community(delete, &creator, &community, None, context).await?;
     Ok(())
   }
 
@@ -169,7 +169,7 @@ impl ApubObjectType for Comment {
       .set_to(public())
       .set_many_ccs(vec![community.actor_id()]);
 
-    send_to_community(undo, &creator, &community, context).await?;
+    send_to_community(undo, &creator, &community, None, context).await?;
     Ok(())
   }
 
@@ -193,7 +193,7 @@ impl ApubObjectType for Comment {
       .set_to(public())
       .set_many_ccs(vec![community.actor_id()]);
 
-    send_to_community(remove, &mod_, &community, context).await?;
+    send_to_community(remove, &mod_, &community, None, context).await?;
     Ok(())
   }
 
@@ -233,7 +233,7 @@ impl ApubObjectType for Comment {
       .set_to(public())
       .set_many_ccs(vec![community.actor_id()]);
 
-    send_to_community(undo, &mod_, &community, context).await?;
+    send_to_community(undo, &mod_, &community, None, context).await?;
     Ok(())
   }
 }
@@ -260,7 +260,7 @@ impl ApubLikeableType for Comment {
       .set_to(public())
       .set_many_ccs(vec![community.actor_id()]);
 
-    send_to_community(like, &creator, &community, context).await?;
+    send_to_community(like, &creator, &community, None, context).await?;
     Ok(())
   }
 
@@ -284,7 +284,7 @@ impl ApubLikeableType for Comment {
       .set_to(public())
       .set_many_ccs(vec![community.actor_id()]);
 
-    send_to_community(dislike, &creator, &community, context).await?;
+    send_to_community(dislike, &creator, &community, None, context).await?;
     Ok(())
   }
 
@@ -323,7 +323,7 @@ impl ApubLikeableType for Comment {
       .set_to(public())
       .set_many_ccs(vec![community.actor_id()]);
 
-    send_to_community(undo, &creator, &community, context).await?;
+    send_to_community(undo, &creator, &community, None, context).await?;
     Ok(())
   }
 }

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

@@ -3,19 +3,29 @@ use crate::{
   activity_queue::{send_activity_single_dest, send_to_community, send_to_community_followers},
   check_is_apub_id_valid,
   extensions::context::lemmy_context,
-  fetcher::person::get_or_fetch_and_upsert_person,
+  fetcher::{get_or_fetch_and_upsert_actor, person::get_or_fetch_and_upsert_person},
   generate_moderators_url,
   insert_activity,
   ActorType,
   CommunityType,
 };
 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,
@@ -62,6 +72,10 @@ impl ActorType for Community {
 
 #[async_trait::async_trait(?Send)]
 impl CommunityType for Community {
+  fn followers_url(&self) -> Url {
+    self.followers_url.clone().into_inner()
+  }
+
   /// As a local community, accept the follow request from a remote person.
   async fn send_accept_follow(
     &self,
@@ -94,9 +108,9 @@ impl CommunityType for Community {
       .set_many_contexts(lemmy_context()?)
       .set_id(generate_activity_id(DeleteType::Delete)?)
       .set_to(public())
-      .set_many_ccs(vec![self.followers_url.clone().into_inner()]);
+      .set_many_ccs(vec![self.followers_url()]);
 
-    send_to_community_followers(delete, self, context).await?;
+    send_to_community_followers(delete, self, None, context).await?;
     Ok(())
   }
 
@@ -107,16 +121,16 @@ impl CommunityType for Community {
       .set_many_contexts(lemmy_context()?)
       .set_id(generate_activity_id(DeleteType::Delete)?)
       .set_to(public())
-      .set_many_ccs(vec![self.followers_url.clone().into_inner()]);
+      .set_many_ccs(vec![self.followers_url()]);
 
     let mut undo = Undo::new(self.actor_id(), delete.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()]);
+      .set_many_ccs(vec![self.followers_url()]);
 
-    send_to_community_followers(undo, self, context).await?;
+    send_to_community_followers(undo, self, None, context).await?;
     Ok(())
   }
 
@@ -127,9 +141,9 @@ impl CommunityType for Community {
       .set_many_contexts(lemmy_context()?)
       .set_id(generate_activity_id(RemoveType::Remove)?)
       .set_to(public())
-      .set_many_ccs(vec![self.followers_url.clone().into_inner()]);
+      .set_many_ccs(vec![self.followers_url()]);
 
-    send_to_community_followers(remove, self, context).await?;
+    send_to_community_followers(remove, self, None, context).await?;
     Ok(())
   }
 
@@ -140,17 +154,17 @@ impl CommunityType for Community {
       .set_many_contexts(lemmy_context()?)
       .set_id(generate_activity_id(RemoveType::Remove)?)
       .set_to(public())
-      .set_many_ccs(vec![self.followers_url.clone().into_inner()]);
+      .set_many_ccs(vec![self.followers_url()]);
 
     // Undo that fake activity
     let mut undo = Undo::new(self.actor_id(), remove.into_any_base()?);
     undo
       .set_many_contexts(lemmy_context()?)
       .set_id(generate_activity_id(LikeType::Like)?)
       .set_to(public())
-      .set_many_ccs(vec![self.followers_url.clone().into_inner()]);
+      .set_many_ccs(vec![self.followers_url()]);
 
-    send_to_community_followers(undo, self, context).await?;
+    send_to_community_followers(undo, self, None, context).await?;
     Ok(())
   }
 
@@ -160,24 +174,41 @@ impl CommunityType for Community {
   /// If we are announcing a local activity, it hasn't been stored in the database yet, and we need
   /// to do it here, so that it can be fetched by ID. Remote activities are inserted into DB in the
   /// inbox.
+  ///
+  /// If the `object` of the announced activity is an actor, the actor ID needs to be passed as
+  /// `object_actor`, so that the announce can be delivered to that user.
   async fn send_announce(
     &self,
     activity: AnyBase,
+    object_actor: Option<Url>,
     context: &LemmyContext,
   ) -> Result<(), LemmyError> {
     let inner_id = activity.id().context(location_info!())?;
     if inner_id.domain() == Some(&Settings::get().get_hostname_without_port()?) {
       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 ccs = vec![self.followers_url()];
+    let mut object_actor_inbox: Option<Url> = None;
+    if let Some(actor_id) = object_actor {
+      // Ignore errors, maybe its not actually an actor
+      // TODO: should pass the actual request counter in, but that seems complicated
+      let actor = get_or_fetch_and_upsert_actor(&actor_id, context, &mut 0)
+        .await
+        .ok();
+      if let Some(actor) = actor {
+        ccs.push(actor_id);
+        object_actor_inbox = Some(actor.get_shared_inbox_or_inbox_url());
+      }
+    }
+    let mut announce = Announce::new(self.actor_id(), activity);
     announce
       .set_many_contexts(lemmy_context()?)
       .set_id(generate_activity_id(AnnounceType::Announce)?)
       .set_to(public())
-      .set_many_ccs(vec![self.followers_url.clone().into_inner()]);
+      .set_many_ccs(ccs);
 
-    send_to_community_followers(announce, self, context).await?;
+    send_to_community_followers(announce, self, object_actor_inbox, context).await?;
 
     Ok(())
   }
@@ -209,18 +240,15 @@ 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)?)
       .set_to(public())
       .set_many_ccs(vec![self.actor_id()])
       .set_target(generate_moderators_url(&self.actor_id)?.into_inner());
 
-    send_to_community(add, actor, self, context).await?;
+    send_to_community(add, actor, self, Some(added_mod.actor_id()), context).await?;
     Ok(())
   }
 
@@ -230,18 +258,57 @@ 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)?)
       .set_to(public())
       .set_many_ccs(vec![self.actor_id()])
       .set_target(generate_moderators_url(&self.actor_id)?.into_inner());
 
-    send_to_community(remove, &actor, self, context).await?;
+    send_to_community(remove, &actor, self, Some(removed_mod.actor_id()), context).await?;
+    Ok(())
+  }
+
+  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, Some(blocked_user.actor_id()), context).await?;
+    Ok(())
+  }
+
+  async fn send_undo_block_user(
+    &self,
+    actor: &Person,
+    unblocked_user: Person,
+    context: &LemmyContext,
+  ) -> Result<(), LemmyError> {
+    let mut block = Block::new(actor.actor_id(), unblocked_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.actor_id()]);
+
+    send_to_community(undo, &actor, self, Some(unblocked_user.actor_id()), context).await?;
     Ok(())
   }
 }