From f8fb3b41f0e6072b9737f0597e04a0785597da4e Mon Sep 17 00:00:00 2001
From: Nutomic <me@nutomic.com>
Date: Mon, 14 Mar 2022 18:20:18 +0000
Subject: [PATCH] Reject federated downvotes if downvotes are disabled (fixes
 #2124) (#2128)

---
 crates/apub/src/activities/voting/vote.rs          | 7 ++++++-
 crates/apub/src/protocol/activities/voting/vote.rs | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/crates/apub/src/activities/voting/vote.rs b/crates/apub/src/activities/voting/vote.rs
index 789a4c67d..11ed9b360 100644
--- a/crates/apub/src/activities/voting/vote.rs
+++ b/crates/apub/src/activities/voting/vote.rs
@@ -13,6 +13,7 @@ use crate::{
   PostOrComment,
 };
 use activitystreams_kinds::public;
+use anyhow::anyhow;
 use lemmy_api_common::blocking;
 use lemmy_apub_lib::{
   data::Data,
@@ -21,7 +22,7 @@ use lemmy_apub_lib::{
 };
 use lemmy_db_schema::{
   newtypes::CommunityId,
-  source::{community::Community, post::Post},
+  source::{community::Community, post::Post, site::Site},
   traits::Crud,
 };
 use lemmy_utils::LemmyError;
@@ -81,6 +82,10 @@ impl ActivityHandler for Vote {
     verify_activity(&self.id, self.actor.inner(), &context.settings())?;
     let community = self.get_community(context, request_counter).await?;
     verify_person_in_community(&self.actor, &community, context, request_counter).await?;
+    let site = blocking(context.pool(), Site::read_local_site).await??;
+    if self.kind == VoteType::Dislike && !site.enable_downvotes {
+      return Err(anyhow!("Downvotes disabled").into());
+    }
     Ok(())
   }
 
diff --git a/crates/apub/src/protocol/activities/voting/vote.rs b/crates/apub/src/protocol/activities/voting/vote.rs
index cafd6bbc3..763d86233 100644
--- a/crates/apub/src/protocol/activities/voting/vote.rs
+++ b/crates/apub/src/protocol/activities/voting/vote.rs
@@ -27,7 +27,7 @@ pub struct Vote {
   pub(crate) unparsed: Unparsed,
 }
 
-#[derive(Clone, Debug, Display, Deserialize, Serialize)]
+#[derive(Clone, Debug, Display, Deserialize, Serialize, PartialEq)]
 pub enum VoteType {
   Like,
   Dislike,