Allow authenticated users to access local-only posts in MastoAPI

Ref: fix-local-public

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -612,9 +612,10 @@ defp restrict_thread_visibility(query, %{user: %User{skip_thread_containment: tr
     do: query
 
   defp restrict_thread_visibility(query, %{user: %User{ap_id: ap_id}}, _) do
+    local_public = as_local_public()
     from(
       a in query,
-      where: fragment("thread_visibility(?, (?)->>'id') = true", ^ap_id, a.data)
+      where: fragment("thread_visibility(?, (?)->>'id', ?) = true", ^ap_id, a.data, ^local_public)
     )
   end
 
@@ -701,8 +702,8 @@ defp fetch_activities_for_reading_user(reading_user, params) do
   defp user_activities_recipients(%{godmode: true}), do: []
 
   defp user_activities_recipients(%{reading_user: reading_user}) do
-    if reading_user do
+    if not is_nil(reading_user) and reading_user.local do
-      [Constants.as_public(), reading_user.ap_id | User.following(reading_user)]
+      [Constants.as_public(), as_local_public(), reading_user.ap_id | User.following(reading_user)]
     else
       [Constants.as_public()]
     end

priv/repo/migrations/20220509180452_change_thread_visibility_to_be_local_only_aware.exs

@@ -0,0 +1,150 @@
+defmodule Pleroma.Repo.Migrations.ChangeThreadVisibilityToBeLocalOnlyAware do
+  use Ecto.Migration
+
+  def up do
+    execute("DROP FUNCTION IF EXISTS thread_visibility(actor varchar, activity_id varchar)")
+    execute(update_thread_visibility())
+  end
+
+  def down do
+    execute("DROP FUNCTION IF EXISTS thread_visibility(actor varchar, activity_id varchar, local_public varchar)")
+    execute(restore_thread_visibility())
+  end
+
+  def update_thread_visibility do
+    """
+    CREATE OR REPLACE FUNCTION thread_visibility(actor varchar, activity_id varchar, local_public varchar default '') RETURNS boolean AS $$
+    DECLARE
+      public varchar := 'https://www.w3.org/ns/activitystreams#Public';
+      child objects%ROWTYPE;
+      activity activities%ROWTYPE;
+      author_fa varchar;
+      valid_recipients varchar[];
+      actor_user_following varchar[];
+    BEGIN
+      --- Fetch actor following
+      SELECT array_agg(following.follower_address) INTO actor_user_following FROM following_relationships
+      JOIN users ON users.id = following_relationships.follower_id
+      JOIN users AS following ON following.id = following_relationships.following_id
+      WHERE users.ap_id = actor;
+
+      --- Fetch our initial activity.
+      SELECT * INTO activity FROM activities WHERE activities.data->>'id' = activity_id;
+
+      LOOP
+        --- Ensure that we have an activity before continuing.
+        --- If we don't, the thread is not satisfiable.
+        IF activity IS NULL THEN
+          RETURN false;
+        END IF;
+
+        --- We only care about Create activities.
+        IF activity.data->>'type' != 'Create' THEN
+          RETURN true;
+        END IF;
+
+        --- Normalize the child object into child.
+        SELECT * INTO child FROM objects
+        INNER JOIN activities ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') = objects.data->>'id'
+        WHERE COALESCE(activity.data->'object'->>'id', activity.data->>'object') = objects.data->>'id';
+
+        --- Fetch the author's AS2 following collection.
+        SELECT COALESCE(users.follower_address, '') INTO author_fa FROM users WHERE users.ap_id = activity.actor;
+
+        --- Prepare valid recipients array.
+        valid_recipients := ARRAY[actor, public];
+        --- If we specified local public, add it.
+        IF local_public <> '' THEN
+          valid_recipients := valid_recipients || local_public;
+        END IF;
+        IF ARRAY[author_fa] && actor_user_following THEN
+          valid_recipients := valid_recipients || author_fa;
+        END IF;
+
+        --- Check visibility.
+        IF NOT valid_recipients && activity.recipients THEN
+          --- activity not visible, break out of the loop
+          RETURN false;
+        END IF;
+
+        --- If there's a parent, load it and do this all over again.
+        IF (child.data->'inReplyTo' IS NOT NULL) AND (child.data->'inReplyTo' != 'null'::jsonb) THEN
+          SELECT * INTO activity FROM activities
+          INNER JOIN objects ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') = objects.data->>'id'
+          WHERE child.data->>'inReplyTo' = objects.data->>'id';
+        ELSE
+          RETURN true;
+        END IF;
+      END LOOP;
+    END;
+    $$ LANGUAGE plpgsql IMMUTABLE;
+    """
+  end
+
+  # priv/repo/migrations/20191007073319_create_following_relationships.exs
+  def restore_thread_visibility do
+    """
+    CREATE OR REPLACE FUNCTION thread_visibility(actor varchar, activity_id varchar) RETURNS boolean AS $$
+    DECLARE
+      public varchar := 'https://www.w3.org/ns/activitystreams#Public';
+      child objects%ROWTYPE;
+      activity activities%ROWTYPE;
+      author_fa varchar;
+      valid_recipients varchar[];
+      actor_user_following varchar[];
+    BEGIN
+      --- Fetch actor following
+      SELECT array_agg(following.follower_address) INTO actor_user_following FROM following_relationships
+      JOIN users ON users.id = following_relationships.follower_id
+      JOIN users AS following ON following.id = following_relationships.following_id
+      WHERE users.ap_id = actor;
+
+      --- Fetch our initial activity.
+      SELECT * INTO activity FROM activities WHERE activities.data->>'id' = activity_id;
+
+      LOOP
+        --- Ensure that we have an activity before continuing.
+        --- If we don't, the thread is not satisfiable.
+        IF activity IS NULL THEN
+          RETURN false;
+        END IF;
+
+        --- We only care about Create activities.
+        IF activity.data->>'type' != 'Create' THEN
+          RETURN true;
+        END IF;
+
+        --- Normalize the child object into child.
+        SELECT * INTO child FROM objects
+        INNER JOIN activities ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') = objects.data->>'id'
+        WHERE COALESCE(activity.data->'object'->>'id', activity.data->>'object') = objects.data->>'id';
+
+        --- Fetch the author's AS2 following collection.
+        SELECT COALESCE(users.follower_address, '') INTO author_fa FROM users WHERE users.ap_id = activity.actor;
+
+        --- Prepare valid recipients array.
+        valid_recipients := ARRAY[actor, public];
+        IF ARRAY[author_fa] && actor_user_following THEN
+          valid_recipients := valid_recipients || author_fa;
+        END IF;
+
+        --- Check visibility.
+        IF NOT valid_recipients && activity.recipients THEN
+          --- activity not visible, break out of the loop
+          RETURN false;
+        END IF;
+
+        --- If there's a parent, load it and do this all over again.
+        IF (child.data->'inReplyTo' IS NOT NULL) AND (child.data->'inReplyTo' != 'null'::jsonb) THEN
+          SELECT * INTO activity FROM activities
+          INNER JOIN objects ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') = objects.data->>'id'
+          WHERE child.data->>'inReplyTo' = objects.data->>'id';
+        ELSE
+          RETURN true;
+        END IF;
+      END LOOP;
+    END;
+    $$ LANGUAGE plpgsql IMMUTABLE;
+    """
+  end
+end

test/pleroma/web/mastodon_api/controllers/account_controller_test.exs

@@ -407,6 +407,20 @@ test "gets users statuses", %{conn: conn} do
       assert id_two == to_string(activity.id)
     end
 
+    test "gets local-only statuses for authenticated users", %{user: _user, conn: conn} do
+      user_one = insert(:user)
+
+      {:ok, activity} = CommonAPI.post(user_one, %{status: "HI!!!", visibility: "local"})
+
+      resp =
+        conn
+        |> get("/api/v1/accounts/#{user_one.id}/statuses")
+        |> json_response_and_validate_schema(200)
+
+      assert [%{"id" => id}] = resp
+      assert id == to_string(activity.id)
+    end
+
     test "gets an users media, excludes reblogs", %{conn: conn} do
       note = insert(:note_activity)
       user = User.get_cached_by_ap_id(note.data["actor"])