User can block instances (fixes #2397) (#3869)

* User can block instances (fixes #2397)

* update comments

* review comments

* use route

* update

* add api test

* update tests

* fix

* fix test

* ci

---------

Co-authored-by: Dessalines <dessalines@users.noreply.github.com>

api_tests/package.json

@@ -19,7 +19,7 @@
     "eslint": "^8.40.0",
     "eslint-plugin-prettier": "^4.0.0",
     "jest": "^29.5.0",
-    "lemmy-js-client": "0.19.0-rc.3",
+    "lemmy-js-client": "0.19.0-rc.5",
     "prettier": "^3.0.0",
     "ts-jest": "^29.1.0",
     "typescript": "^5.0.4"

api_tests/src/community.spec.ts

@@ -24,6 +24,7 @@ import {
   getComments,
   createComment,
   getCommunityByName,
+  blockInstance,
   waitUntil,
   delay,
 } from "./shared";
@@ -348,3 +349,39 @@ test("Get community for different casing on domain", async () => {
     .community_view;
   assertCommunityFederation(betaCommunity, communityRes.community_view);
 });
+
+test("User blocks instance, communities are hidden", async () => {
+  // create community and post on beta
+  let communityRes = await createCommunity(beta);
+  expect(communityRes.community_view.community.name).toBeDefined();
+  let postRes = await createPost(
+    beta,
+    communityRes.community_view.community.id,
+  );
+  expect(postRes.post_view.post.id).toBeDefined();
+
+  // fetch post to alpha
+  let alphaPost = await resolvePost(alpha, postRes.post_view.post);
+  expect(alphaPost.post?.post).toBeDefined();
+
+  // post should be included in listing
+  let listing = await getPosts(alpha, "All");
+  let listing_ids = listing.posts.map(p => p.post.ap_id);
+  expect(listing_ids).toContain(postRes.post_view.post.ap_id);
+
+  // block the beta instance
+  await blockInstance(alpha, alphaPost.post!.community.instance_id, true);
+
+  // after blocking, post should not be in listing
+  let listing2 = await getPosts(alpha, "All");
+  let listing_ids2 = listing2.posts.map(p => p.post.ap_id);
+  expect(listing_ids2.indexOf(postRes.post_view.post.ap_id)).toBe(-1);
+
+  // unblock instance again
+  await blockInstance(alpha, alphaPost.post!.community.instance_id, false);
+
+  // post should be included in listing
+  let listing3 = await getPosts(alpha, "All");
+  let listing_ids3 = listing3.posts.map(p => p.post.ap_id);
+  expect(listing_ids3).toContain(postRes.post_view.post.ap_id);
+});

api_tests/src/shared.ts

@@ -1,8 +1,11 @@
 import {
+  BlockInstance,
+  BlockInstanceResponse,
   GetReplies,
   GetRepliesResponse,
   GetUnreadCount,
   GetUnreadCountResponse,
+  InstanceId,
   LemmyHttp,
 } from "lemmy-js-client";
 import { CreatePost } from "lemmy-js-client/dist/types/CreatePost";
@@ -817,6 +820,19 @@ export function getPosts(
   return api.client.getPosts(form);
 }
 
+export function blockInstance(
+  api: API,
+  instance_id: InstanceId,
+  block: boolean,
+): Promise<BlockInstanceResponse> {
+  let form: BlockInstance = {
+    instance_id,
+    block,
+    auth: api.auth,
+  };
+  return api.client.blockInstance(form);
+}
+
 export function delay(millis = 500) {
   return new Promise(resolve => setTimeout(resolve, millis));
 }

api_tests/yarn.lock

@@ -2174,10 +2174,10 @@ kleur@^3.0.3:
   resolved "https://registry.yarnpkg.com/kleur/-/kleur-3.0.3.tgz#a79c9ecc86ee1ce3fa6206d1216c501f147fc07e"
   integrity sha512-eTIzlVOSUR+JxdDFepEYcBMtZ9Qqdef+rnzWdRZuMbOywu5tO2w2N7rqjoANZ5k9vywhL6Br1VRjUIgTQx4E8w==
 
-lemmy-js-client@0.19.0-rc.3:
-  version "0.19.0-rc.3"
-  resolved "https://registry.yarnpkg.com/lemmy-js-client/-/lemmy-js-client-0.19.0-rc.3.tgz#1efbfd5ce492319227a41cb020fc1cf9b2e7c075"
-  integrity sha512-RmibQ3+YTvqsQ89II2I29pfPmVAWiSObGAU9Nc/AGYfyvaCya7f5+TirKwHdKA2eWDWLOTnD4rm6WgcgAwvhWw==
+lemmy-js-client@0.19.0-rc.5:
+  version "0.19.0-rc.5"
+  resolved "https://registry.yarnpkg.com/lemmy-js-client/-/lemmy-js-client-0.19.0-rc.5.tgz#a0d3e0ac829b1e46124edcf3a0343ae04317d51a"
+  integrity sha512-Z1T95Ht1VZNvWlLH9XpVnO2oC7LhMT81jTiU5BhYPIkEtGhOwN91jk5uI1oyI6/d4v9lwbrsyzFYPsiuMmXTFQ==
   dependencies:
     cross-fetch "^3.1.5"
     form-data "^4.0.0"

crates/api/src/site/block.rs

@@ -0,0 +1,41 @@
+use activitypub_federation::config::Data;
+use actix_web::web::Json;
+use lemmy_api_common::{
+  context::LemmyContext,
+  site::{BlockInstance, BlockInstanceResponse},
+  utils::local_user_view_from_jwt,
+};
+use lemmy_db_schema::{
+  source::instance_block::{InstanceBlock, InstanceBlockForm},
+  traits::Blockable,
+};
+use lemmy_utils::error::{LemmyError, LemmyErrorExt, LemmyErrorType};
+
+#[tracing::instrument(skip(context))]
+pub async fn block_instance(
+  data: Json<BlockInstance>,
+  context: Data<LemmyContext>,
+) -> Result<Json<BlockInstanceResponse>, LemmyError> {
+  let local_user_view = local_user_view_from_jwt(&data.auth, &context).await?;
+
+  let instance_id = data.instance_id;
+  let person_id = local_user_view.person.id;
+  let instance_block_form = InstanceBlockForm {
+    person_id,
+    instance_id,
+  };
+
+  if data.block {
+    InstanceBlock::block(&mut context.pool(), &instance_block_form)
+      .await
+      .with_lemmy_type(LemmyErrorType::InstanceBlockAlreadyExists)?;
+  } else {
+    InstanceBlock::unblock(&mut context.pool(), &instance_block_form)
+      .await
+      .with_lemmy_type(LemmyErrorType::InstanceBlockAlreadyExists)?;
+  }
+
+  Ok(Json(BlockInstanceResponse {
+    blocked: data.block,
+  }))
+}

crates/api/src/site/mod.rs

@@ -1,3 +1,4 @@
+pub mod block;
 pub mod federated_instances;
 pub mod leave_admin;
 pub mod mod_log;

crates/api_common/src/site.rs

@@ -1,6 +1,6 @@
 use crate::sensitive::Sensitive;
 use lemmy_db_schema::{
-  newtypes::{CommentId, CommunityId, LanguageId, PersonId, PostId},
+  newtypes::{CommentId, CommunityId, InstanceId, LanguageId, PersonId, PostId},
   source::{instance::Instance, language::Language, tagline::Tagline},
   ListingType,
   ModlogActionType,
@@ -21,6 +21,7 @@ use lemmy_db_views_actor::structs::{
   CommunityFollowerView,
   CommunityModeratorView,
   CommunityView,
+  InstanceBlockView,
   PersonBlockView,
   PersonView,
 };
@@ -320,6 +321,7 @@ pub struct MyUserInfo {
   pub follows: Vec<CommunityFollowerView>,
   pub moderates: Vec<CommunityModeratorView>,
   pub community_blocks: Vec<CommunityBlockView>,
+  pub instance_blocks: Vec<InstanceBlockView>,
   pub person_blocks: Vec<PersonBlockView>,
   pub discussion_languages: Vec<LanguageId>,
 }
@@ -450,3 +452,21 @@ pub struct GetUnreadRegistrationApplicationCount {
 pub struct GetUnreadRegistrationApplicationCountResponse {
   pub registration_applications: i64,
 }
+
+#[derive(Debug, Serialize, Deserialize, Clone, Default)]
+#[cfg_attr(feature = "full", derive(TS))]
+#[cfg_attr(feature = "full", ts(export))]
+/// Block an instance as user
+pub struct BlockInstance {
+  pub instance_id: InstanceId,
+  pub block: bool,
+  pub auth: Sensitive<String>,
+}
+
+#[skip_serializing_none]
+#[derive(Debug, Serialize, Deserialize, Clone)]
+#[cfg_attr(feature = "full", derive(TS))]
+#[cfg_attr(feature = "full", ts(export))]
+pub struct BlockInstanceResponse {
+  pub blocked: bool,
+}

crates/api_crud/src/site/read.rs

@@ -18,6 +18,7 @@ use lemmy_db_views_actor::structs::{
   CommunityBlockView,
   CommunityFollowerView,
   CommunityModeratorView,
+  InstanceBlockView,
   PersonBlockView,
   PersonView,
 };
@@ -52,6 +53,10 @@ pub async fn get_site(
       .await
       .with_lemmy_type(LemmyErrorType::SystemErrLogin)?;
 
+    let instance_blocks = InstanceBlockView::for_person(&mut context.pool(), person_id)
+      .await
+      .with_lemmy_type(LemmyErrorType::SystemErrLogin)?;
+
     let person_id = local_user_view.person.id;
     let person_blocks = PersonBlockView::for_person(&mut context.pool(), person_id)
       .await
@@ -70,6 +75,7 @@ pub async fn get_site(
       follows,
       moderates,
       community_blocks,
+      instance_blocks,
       person_blocks,
       discussion_languages,
     })

crates/db_schema/src/aggregates/structs.rs

@@ -1,4 +1,4 @@
-use crate::newtypes::{CommentId, CommunityId, PersonId, PostId, SiteId};
+use crate::newtypes::{CommentId, CommunityId, InstanceId, PersonId, PostId, SiteId};
 #[cfg(feature = "full")]
 use crate::schema::{
   comment_aggregates,
@@ -100,6 +100,7 @@ pub struct PostAggregates {
   pub community_id: CommunityId,
   pub creator_id: PersonId,
   pub controversy_rank: f64,
+  pub instance_id: InstanceId,
   /// A rank that amplifies smaller communities
   pub scaled_rank: f64,
 }

crates/db_schema/src/impls/instance_block.rs

@@ -0,0 +1,36 @@
+use crate::{
+  schema::instance_block::dsl::{instance_block, instance_id, person_id},
+  source::instance_block::{InstanceBlock, InstanceBlockForm},
+  traits::Blockable,
+  utils::{get_conn, DbPool},
+};
+use diesel::{dsl::insert_into, result::Error, ExpressionMethods, QueryDsl};
+use diesel_async::RunQueryDsl;
+
+#[async_trait]
+impl Blockable for InstanceBlock {
+  type Form = InstanceBlockForm;
+  async fn block(pool: &mut DbPool<'_>, instance_block_form: &Self::Form) -> Result<Self, Error> {
+    let conn = &mut get_conn(pool).await?;
+    insert_into(instance_block)
+      .values(instance_block_form)
+      .on_conflict((person_id, instance_id))
+      .do_update()
+      .set(instance_block_form)
+      .get_result::<Self>(conn)
+      .await
+  }
+  async fn unblock(
+    pool: &mut DbPool<'_>,
+    instance_block_form: &Self::Form,
+  ) -> Result<usize, Error> {
+    let conn = &mut get_conn(pool).await?;
+    diesel::delete(
+      instance_block
+        .filter(person_id.eq(instance_block_form.person_id))
+        .filter(instance_id.eq(instance_block_form.instance_id)),
+    )
+    .execute(conn)
+    .await
+  }
+}

crates/db_schema/src/impls/mod.rs

@@ -12,6 +12,7 @@ pub mod federation_allowlist;
 pub mod federation_blocklist;
 pub mod image_upload;
 pub mod instance;
+pub mod instance_block;
 pub mod language;
 pub mod local_site;
 pub mod local_site_rate_limit;

crates/db_schema/src/schema.rs

@@ -337,6 +337,15 @@ diesel::table! {
     }
 }
 
+diesel::table! {
+    instance_block (id) {
+        id -> Int4,
+        person_id -> Int4,
+        instance_id -> Int4,
+        published -> Timestamptz,
+    }
+}
+
 diesel::table! {
     language (id) {
         id -> Int4,
@@ -712,6 +721,7 @@ diesel::table! {
         community_id -> Int4,
         creator_id -> Int4,
         controversy_rank -> Float8,
+        instance_id -> Int4,
         scaled_rank -> Float8,
     }
 }
@@ -928,6 +938,8 @@ diesel::joinable!(federation_allowlist -> instance (instance_id));
 diesel::joinable!(federation_blocklist -> instance (instance_id));
 diesel::joinable!(federation_queue_state -> instance (instance_id));
 diesel::joinable!(image_upload -> local_user (local_user_id));
+diesel::joinable!(instance_block -> instance (instance_id));
+diesel::joinable!(instance_block -> person (person_id));
 diesel::joinable!(local_site -> site (site_id));
 diesel::joinable!(local_site_rate_limit -> local_site (local_site_id));
 diesel::joinable!(local_user -> person (person_id));
@@ -960,6 +972,7 @@ diesel::joinable!(post -> community (community_id));
 diesel::joinable!(post -> language (language_id));
 diesel::joinable!(post -> person (creator_id));
 diesel::joinable!(post_aggregates -> community (community_id));
+diesel::joinable!(post_aggregates -> instance (instance_id));
 diesel::joinable!(post_aggregates -> person (creator_id));
 diesel::joinable!(post_aggregates -> post (post_id));
 diesel::joinable!(post_like -> person (person_id));
@@ -1005,6 +1018,7 @@ diesel::allow_tables_to_appear_in_same_query!(
     federation_queue_state,
     image_upload,
     instance,
+    instance_block,
     language,
     local_site,
     local_site_rate_limit,

crates/db_schema/src/source/instance_block.rs

@@ -0,0 +1,26 @@
+use crate::newtypes::{InstanceId, PersonId};
+#[cfg(feature = "full")]
+use crate::schema::instance_block;
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, PartialEq, Eq, Debug, Serialize, Deserialize)]
+#[cfg_attr(feature = "full", derive(Queryable, Associations, Identifiable))]
+#[cfg_attr(
+  feature = "full",
+  diesel(belongs_to(crate::source::instance::Instance))
+)]
+#[cfg_attr(feature = "full", diesel(table_name = instance_block))]
+pub struct InstanceBlock {
+  pub id: i32,
+  pub person_id: PersonId,
+  pub instance_id: InstanceId,
+  pub published: DateTime<Utc>,
+}
+
+#[cfg_attr(feature = "full", derive(Insertable, AsChangeset))]
+#[cfg_attr(feature = "full", diesel(table_name = instance_block))]
+pub struct InstanceBlockForm {
+  pub person_id: PersonId,
+  pub instance_id: InstanceId,
+}

crates/db_schema/src/source/mod.rs

@@ -17,6 +17,7 @@ pub mod federation_allowlist;
 pub mod federation_blocklist;
 pub mod image_upload;
 pub mod instance;
+pub mod instance_block;
 pub mod language;
 pub mod local_site;
 pub mod local_site_rate_limit;

crates/db_views/src/comment_view.rs

@@ -23,6 +23,7 @@ use lemmy_db_schema::{
     community_follower,
     community_moderator,
     community_person_ban,
+    instance_block,
     local_user_language,
     person,
     person_block,
@@ -121,6 +122,13 @@ fn queries<'a>() -> Queries<
     let local_user_id_join = local_user_id.unwrap_or(LocalUserId(-1));
 
     let mut query = all_joins(comment::table.into_boxed(), person_id)
+      .left_join(
+        instance_block::table.on(
+          community::instance_id
+            .eq(instance_block::instance_id)
+            .and(instance_block::person_id.eq(person_id_join)),
+        ),
+      )
       .left_join(
         community_block::table.on(
           community::id
@@ -221,6 +229,7 @@ fn queries<'a>() -> Queries<
 
       // Don't show blocked communities or persons
       if options.post_id.is_none() {
+        query = query.filter(instance_block::person_id.is_null());
         query = query.filter(community_block::person_id.is_null());
       }
       query = query.filter(person_block::person_id.is_null());

crates/db_views/src/post_view.rs

@@ -28,6 +28,7 @@ use lemmy_db_schema::{
     community_follower,
     community_moderator,
     community_person_ban,
+    instance_block,
     local_user_language,
     person,
     person_block,
@@ -420,7 +421,7 @@ fn queries<'a>() -> Queries<
         ),
       ));
 
-      // Don't show blocked communities or persons
+      // Don't show blocked instances, communities or persons
       query = query.filter(not(exists(
         community_block::table.filter(
           post_aggregates::community_id
@@ -428,6 +429,13 @@ fn queries<'a>() -> Queries<
             .and(community_block::person_id.eq(person_id_join)),
         ),
       )));
+      query = query.filter(not(exists(
+        instance_block::table.filter(
+          post_aggregates::instance_id
+            .eq(instance_block::instance_id)
+            .and(instance_block::person_id.eq(person_id_join)),
+        ),
+      )));
       query = query.filter(not(is_creator_blocked(person_id)));
     }
     let now = diesel::dsl::now.into_sql::<Timestamptz>();
@@ -706,6 +714,7 @@ mod tests {
       community::{Community, CommunityInsertForm},
       community_block::{CommunityBlock, CommunityBlockForm},
       instance::Instance,
+      instance_block::{InstanceBlock, InstanceBlockForm},
       language::Language,
       local_user::{LocalUser, LocalUserInsertForm, LocalUserUpdateForm},
       person::{Person, PersonInsertForm},
@@ -1239,6 +1248,84 @@ mod tests {
     cleanup(data, pool).await;
   }
 
+  #[tokio::test]
+  #[serial]
+  async fn post_listing_instance_block() {
+    let pool = &build_db_pool_for_tests().await;
+    let pool = &mut pool.into();
+    let data = init_data(pool).await;
+
+    let blocked_instance = Instance::read_or_create(pool, "another_domain.tld".to_string())
+      .await
+      .unwrap();
+
+    let community_form = CommunityInsertForm::builder()
+      .name("test_community_4".to_string())
+      .title("none".to_owned())
+      .public_key("pubkey".to_string())
+      .instance_id(blocked_instance.id)
+      .build();
+    let inserted_community = Community::create(pool, &community_form).await.unwrap();
+
+    let post_form = PostInsertForm::builder()
+      .name("blocked instance post".to_string())
+      .creator_id(data.inserted_bot.id)
+      .community_id(inserted_community.id)
+      .language_id(Some(LanguageId(1)))
+      .build();
+
+    let post_from_blocked_instance = Post::create(pool, &post_form).await.unwrap();
+
+    // no instance block, should return all posts
+    let post_listings_all = PostQuery {
+      local_user: Some(&data.local_user_view),
+      ..Default::default()
+    }
+    .list(pool)
+    .await
+    .unwrap();
+    assert_eq!(post_listings_all.len(), 3);
+
+    // block the instance
+    let block_form = InstanceBlockForm {
+      person_id: data.local_user_view.person.id,
+      instance_id: blocked_instance.id,
+    };
+    InstanceBlock::block(pool, &block_form).await.unwrap();
+
+    // now posts from communities on that instance should be hidden
+    let post_listings_blocked = PostQuery {
+      local_user: Some(&data.local_user_view),
+      ..Default::default()
+    }
+    .list(pool)
+    .await
+    .unwrap();
+    assert_eq!(post_listings_blocked.len(), 2);
+    assert_ne!(
+      post_listings_blocked[0].post.id,
+      post_from_blocked_instance.id
+    );
+    assert_ne!(
+      post_listings_blocked[1].post.id,
+      post_from_blocked_instance.id
+    );
+
+    // after unblocking it should return all posts again
+    InstanceBlock::unblock(pool, &block_form).await.unwrap();
+    let post_listings_blocked = PostQuery {
+      local_user: Some(&data.local_user_view),
+      ..Default::default()
+    }
+    .list(pool)
+    .await
+    .unwrap();
+    assert_eq!(post_listings_blocked.len(), 3);
+
+    Instance::delete(pool, blocked_instance.id).await.unwrap();
+    cleanup(data, pool).await;
+  }
+
   async fn cleanup(data: Data, pool: &mut DbPool<'_>) {
     let num_deleted = Post::delete(pool, data.inserted_post.id).await.unwrap();
     Community::delete(pool, data.inserted_community.id)
@@ -1359,6 +1446,7 @@ mod tests {
         scaled_rank: 0.3621,
         community_id: inserted_post.community_id,
         creator_id: inserted_post.creator_id,
+        instance_id: data.inserted_instance.id,
       },
       subscribed: SubscribedType::NotSubscribed,
       read: false,

crates/db_views_actor/src/community_view.rs

@@ -12,7 +12,14 @@ use diesel::{
 use diesel_async::RunQueryDsl;
 use lemmy_db_schema::{
   newtypes::{CommunityId, PersonId},
-  schema::{community, community_aggregates, community_block, community_follower, local_user},
+  schema::{
+    community,
+    community_aggregates,
+    community_block,
+    community_follower,
+    instance_block,
+    local_user,
+  },
   source::{community::CommunityFollower, local_user::LocalUser},
   utils::{fuzzy_search, limit_and_offset, DbConn, DbPool, ListFn, Queries, ReadFn},
   ListingType,
@@ -36,6 +43,13 @@ fn queries<'a>() -> Queries<
             .and(community_follower::person_id.eq(person_id_join)),
         ),
       )
+      .left_join(
+        instance_block::table.on(
+          community::instance_id
+            .eq(instance_block::instance_id)
+            .and(instance_block::person_id.eq(person_id_join)),
+        ),
+      )
       .left_join(
         community_block::table.on(
           community::id
@@ -131,8 +145,10 @@ fn queries<'a>() -> Queries<
       };
     }
 
-    // Don't show blocked communities or nsfw communities if not enabled in profile
+    // Don't show blocked communities and communities on blocked instances. nsfw communities are
+    // also hidden (based on profile setting)
     if options.local_user.is_some() {
+      query = query.filter(instance_block::person_id.is_null());
       query = query.filter(community_block::person_id.is_null());
       query = query.filter(community::nsfw.eq(false).or(local_user::show_nsfw.eq(true)));
     } else {

crates/db_views_actor/src/instance_block_view.rs

@@ -0,0 +1,27 @@
+use crate::structs::InstanceBlockView;
+use diesel::{result::Error, ExpressionMethods, JoinOnDsl, NullableExpressionMethods, QueryDsl};
+use diesel_async::RunQueryDsl;
+use lemmy_db_schema::{
+  newtypes::PersonId,
+  schema::{instance, instance_block, person, site},
+  utils::{get_conn, DbPool},
+};
+
+impl InstanceBlockView {
+  pub async fn for_person(pool: &mut DbPool<'_>, person_id: PersonId) -> Result<Vec<Self>, Error> {
+    let conn = &mut get_conn(pool).await?;
+    instance_block::table
+      .inner_join(person::table)
+      .inner_join(instance::table)
+      .left_join(site::table.on(site::instance_id.eq(instance::id)))
+      .select((
+        person::all_columns,
+        instance::all_columns,
+        site::all_columns.nullable(),
+      ))
+      .filter(instance_block::person_id.eq(person_id))
+      .order_by(instance_block::published)
+      .load::<InstanceBlockView>(conn)
+      .await
+  }
+}

crates/db_views_actor/src/lib.rs

@@ -11,6 +11,8 @@ pub mod community_person_ban_view;
 #[cfg(feature = "full")]
 pub mod community_view;
 #[cfg(feature = "full")]
+pub mod instance_block_view;
+#[cfg(feature = "full")]
 pub mod person_block_view;
 #[cfg(feature = "full")]
 pub mod person_mention_view;

crates/db_views_actor/src/structs.rs

@@ -6,9 +6,11 @@ use lemmy_db_schema::{
     comment::Comment,
     comment_reply::CommentReply,
     community::Community,
+    instance::Instance,
     person::Person,
     person_mention::PersonMention,
     post::Post,
+    site::Site,
   },
   SubscribedType,
 };
@@ -26,6 +28,17 @@ pub struct CommunityBlockView {
   pub community: Community,
 }
 
+#[skip_serializing_none]
+#[derive(Debug, Serialize, Deserialize, Clone)]
+#[cfg_attr(feature = "full", derive(TS, Queryable))]
+#[cfg_attr(feature = "full", ts(export))]
+/// An instance block by a user.
+pub struct InstanceBlockView {
+  pub person: Person,
+  pub instance: Instance,
+  pub site: Option<Site>,
+}
+
 #[derive(Debug, Serialize, Deserialize, Clone)]
 #[cfg_attr(feature = "full", derive(TS, Queryable))]
 #[cfg_attr(feature = "full", ts(export))]

crates/utils/src/error.rs

@@ -209,6 +209,7 @@ pub enum LemmyErrorType {
   InvalidUrlScheme,
   CouldntSendWebmention,
   ContradictingFilters,
+  InstanceBlockAlreadyExists,
   AuthCookieInsecure,
   Unknown(String),
 }

migrations/2023-08-09-101305_user_instance_block/down.sql

@@ -0,0 +1,21 @@
+DROP TABLE instance_block;
+
+ALTER TABLE post_aggregates
+    DROP COLUMN instance_id;
+
+CREATE OR REPLACE FUNCTION post_aggregates_post ()
+    RETURNS TRIGGER
+    LANGUAGE plpgsql
+    AS $$
+BEGIN
+    IF (TG_OP = 'INSERT') THEN
+        INSERT INTO post_aggregates (post_id, published, newest_comment_time, newest_comment_time_necro, community_id, creator_id)
+            VALUES (NEW.id, NEW.published, NEW.published, NEW.published, NEW.community_id, NEW.creator_id);
+    ELSIF (TG_OP = 'DELETE') THEN
+        DELETE FROM post_aggregates
+        WHERE post_id = OLD.id;
+    END IF;
+    RETURN NULL;
+END
+$$;
+

migrations/2023-08-09-101305_user_instance_block/up.sql

@@ -0,0 +1,51 @@
+CREATE TABLE instance_block (
+    id serial PRIMARY KEY,
+    person_id int REFERENCES person ON UPDATE CASCADE ON DELETE CASCADE NOT NULL,
+    instance_id int REFERENCES instance ON UPDATE CASCADE ON DELETE CASCADE NOT NULL,
+    published timestamptz NOT NULL DEFAULT now(),
+    UNIQUE (person_id, instance_id)
+);
+
+ALTER TABLE post_aggregates
+    ADD COLUMN instance_id integer REFERENCES instance ON UPDATE CASCADE ON DELETE CASCADE;
+
+CREATE OR REPLACE FUNCTION post_aggregates_post ()
+    RETURNS TRIGGER
+    LANGUAGE plpgsql
+    AS $$
+BEGIN
+    IF (TG_OP = 'INSERT') THEN
+        INSERT INTO post_aggregates (post_id, published, newest_comment_time, newest_comment_time_necro, community_id, creator_id, instance_id)
+        SELECT
+            NEW.id,
+            NEW.published,
+            NEW.published,
+            NEW.published,
+            NEW.community_id,
+            NEW.creator_id,
+            community.instance_id
+        FROM
+            community
+        WHERE
+            NEW.community_id = community.id;
+    ELSIF (TG_OP = 'DELETE') THEN
+        DELETE FROM post_aggregates
+        WHERE post_id = OLD.id;
+    END IF;
+    RETURN NULL;
+END
+$$;
+
+UPDATE
+    post_aggregates
+SET
+    instance_id = community.instance_id
+FROM
+    post
+    JOIN community ON post.community_id = community.id
+WHERE
+    post.id = post_aggregates.post_id;
+
+ALTER TABLE post_aggregates
+    ALTER COLUMN instance_id SET NOT NULL;
+

src/api_routes_http.rs

@@ -56,6 +56,7 @@ use lemmy_api::{
     resolve::resolve_pm_report,
   },
   site::{
+    block::block_instance,
     federated_instances::get_federated_instances,
     leave_admin::leave_admin,
     mod_log::get_mod_log,
@@ -129,7 +130,8 @@ pub fn config(cfg: &mut web::ServiceConfig, rate_limit: &RateLimitCell) {
           .route("", web::get().to(get_site))
           // Admin Actions
           .route("", web::post().to(create_site))
-          .route("", web::put().to(update_site)),
+          .route("", web::put().to(update_site))
+          .route("/block", web::post().to(block_instance)),
       )
       .service(
         web::resource("/modlog")