From 41d4852efcd47d2eb0d68e11fcc96d762b7402d7 Mon Sep 17 00:00:00 2001
From: Nutomic <me@nutomic.com>
Date: Fri, 25 Nov 2022 14:01:58 +0000
Subject: [PATCH] Federate group moderators using attributedTo field (#2588)

* Federate group moderators using attributedTo field

* fix tests

Co-authored-by: Dessalines <dessalines@users.noreply.github.com>
---
 crates/apub/assets/lemmy/objects/group.json |  1 +
 crates/apub/src/objects/community.rs        | 11 +++++++----
 crates/apub/src/protocol/objects/group.rs   |  4 +++-
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/crates/apub/assets/lemmy/objects/group.json b/crates/apub/assets/lemmy/objects/group.json
index c694d069..d44cc79b 100644
--- a/crates/apub/assets/lemmy/objects/group.json
+++ b/crates/apub/assets/lemmy/objects/group.json
@@ -20,6 +20,7 @@
   "inbox": "https://enterprise.lemmy.ml/c/tenforward/inbox",
   "followers": "https://enterprise.lemmy.ml/c/tenforward/followers",
   "moderators": "https://enterprise.lemmy.ml/c/tenforward/moderators",
+  "attributedTo": "https://enterprise.lemmy.ml/c/tenforward/moderators",
   "postingRestrictedToMods": false,
   "endpoints": {
     "sharedInbox": "https://enterprise.lemmy.ml/inbox"
diff --git a/crates/apub/src/objects/community.rs b/crates/apub/src/objects/community.rs
index c15c23d3..aefc7edb 100644
--- a/crates/apub/src/objects/community.rs
+++ b/crates/apub/src/objects/community.rs
@@ -89,6 +89,9 @@ impl ApubObject for ApubCommunity {
     let community_id = self.id;
     let langs = CommunityLanguage::read(data.pool(), community_id).await?;
     let language = LanguageTag::new_multiple(langs, data.pool()).await?;
+    let attributed_to = Some(ObjectId::<ApubCommunityModerators>::new(
+      generate_moderators_url(&self.actor_id)?,
+    ));
 
     let group = Group {
       kind: GroupType::Group,
@@ -100,9 +103,7 @@ impl ApubObject for ApubCommunity {
       icon: self.icon.clone().map(ImageObject::new),
       image: self.banner.clone().map(ImageObject::new),
       sensitive: Some(self.nsfw),
-      moderators: Some(ObjectId::<ApubCommunityModerators>::new(
-        generate_moderators_url(&self.actor_id)?,
-      )),
+      moderators: attributed_to.clone(),
       inbox: self.inbox_url.clone().into(),
       outbox: ObjectId::new(generate_outbox_url(&self.actor_id)?),
       followers: self.followers_url.clone().into(),
@@ -114,6 +115,7 @@ impl ApubObject for ApubCommunity {
       published: Some(convert_datetime(self.published)),
       updated: self.updated.map(convert_datetime),
       posting_restricted_to_mods: Some(self.posting_restricted_to_mods),
+      attributed_to,
     };
     Ok(group)
   }
@@ -156,7 +158,7 @@ impl ApubObject for ApubCommunity {
       .map_err(|e| debug!("{}", e))
       .ok();
 
-    if let Some(moderators) = &group.moderators {
+    if let Some(moderators) = group.attributed_to.or(group.moderators) {
       moderators
         .dereference(&outbox_data, local_instance(context).await, request_counter)
         .await
@@ -240,6 +242,7 @@ pub(crate) mod tests {
     let mut json: Group = file_to_json_object("assets/lemmy/objects/group.json").unwrap();
     // change these links so they dont fetch over the network
     json.moderators = None;
+    json.attributed_to = None;
     json.outbox =
       ObjectId::new(Url::parse("https://enterprise.lemmy.ml/c/tenforward/not_outbox").unwrap());
 
diff --git a/crates/apub/src/protocol/objects/group.rs b/crates/apub/src/protocol/objects/group.rs
index 1935589e..564aed16 100644
--- a/crates/apub/src/protocol/objects/group.rs
+++ b/crates/apub/src/protocol/objects/group.rs
@@ -57,8 +57,10 @@ pub struct Group {
   pub(crate) image: Option<ImageObject>,
   // lemmy extension
   pub(crate) sensitive: Option<bool>,
-  // lemmy extension
+  // deprecated, use attributed_to instead
   pub(crate) moderators: Option<ObjectId<ApubCommunityModerators>>,
+  #[serde(deserialize_with = "deserialize_skip_error", default)]
+  pub(crate) attributed_to: Option<ObjectId<ApubCommunityModerators>>,
   // lemmy extension
   pub(crate) posting_restricted_to_mods: Option<bool>,
   pub(crate) outbox: ObjectId<ApubCommunityOutbox>,
-- 
2.44.1