instance actor name and webfinger

Cargo.lock

@@ -17,7 +17,7 @@ checksum = "8f27d075294830fcab6f66e320dab524bc6d048f4a151698e153205559113772"
 [[package]]
 name = "activitypub_federation"
 version = "0.5.1"
-source = "git+https://github.com/LemmyNet/activitypub-federation-rust.git?branch=debug-signed-fetch#294c77c01b6cc5fd1b34126710edc56cd9769789"
+source = "git+https://github.com/LemmyNet/activitypub-federation-rust.git?branch=debug-signed-fetch#b3978cf4183297590cb992cd9684484c7f94b279"
 dependencies = [
  "activitystreams-kinds",
  "actix-web",

crates/apub/src/objects/instance.rs

@@ -96,6 +96,7 @@ impl Object for ApubSite {
       kind: ApplicationType::Application,
       id: self.id().into(),
       name: self.name.clone(),
+      preferred_username: data.domain().to_string(),
       content: self.sidebar.as_ref().map(|d| markdown_to_html(d)),
       source: self.sidebar.clone().map(Source::new),
       summary: self.description.clone(),

crates/apub/src/protocol/objects/instance.rs

@@ -19,8 +19,10 @@ pub struct Instance {
   #[serde(rename = "type")]
   pub(crate) kind: ApplicationType,
   pub(crate) id: ObjectId<ApubSite>,
-  // site name
+  /// site name
   pub(crate) name: String,
+  /// domain, necessary for mastodon authorized fetch
+  pub(crate) preferred_username: String,
   pub(crate) inbox: Url,
   /// mandatory field in activitypub, lemmy currently serves an empty outbox
   pub(crate) outbox: Url,

crates/routes/src/webfinger.rs

@@ -38,28 +38,35 @@ async fn get_webfinger_response(
 ) -> Result<HttpResponse, LemmyError> {
   let name = extract_webfinger_name(&info.resource, &context)?;
 
-  let user_id: Option<Url> = Person::read_from_name(&mut context.pool(), name, false)
-    .await
-    .ok()
-    .map(|c| c.actor_id.into());
-  let community_id: Option<Url> = Community::read_from_name(&mut context.pool(), name, false)
-    .await
-    .ok()
-    .and_then(|c| {
-      if c.visibility == CommunityVisibility::Public {
-        let id: Url = c.actor_id.into();
-        Some(id)
-      } else {
-        None
-      }
-    });
+  let links = if name == context.domain() {
+    // webfinger response for instance actor (required for mastodon authorized fetch)
+    let url = Url::parse(&format!("https://{name}"))?;
+    vec![webfinger_link_for_actor(Some(url), "none", &context)]
+  } else {
+    // webfinger response for user/community
+    let user_id: Option<Url> = Person::read_from_name(&mut context.pool(), name, false)
+      .await
+      .ok()
+      .map(|c| c.actor_id.into());
+    let community_id: Option<Url> = Community::read_from_name(&mut context.pool(), name, false)
+      .await
+      .ok()
+      .and_then(|c| {
+        if c.visibility == CommunityVisibility::Public {
+          let id: Url = c.actor_id.into();
+          Some(id)
+        } else {
+          None
+        }
+      });
 
-  // Mastodon seems to prioritize the last webfinger item in case of duplicates. Put
-  // community last so that it gets prioritized. For Lemmy the order doesnt matter.
-  let links = vec![
-    webfinger_link_for_actor(user_id, "Person", &context),
-    webfinger_link_for_actor(community_id, "Group", &context),
-  ]
+    // Mastodon seems to prioritize the last webfinger item in case of duplicates. Put
+    // community last so that it gets prioritized. For Lemmy the order doesnt matter.
+    vec![
+      webfinger_link_for_actor(user_id, "Person", &context),
+      webfinger_link_for_actor(community_id, "Group", &context),
+    ]
+  }
   .into_iter()
   .flatten()
   .collect();