Accept webfinger requests where "resource" is instance actor ID

CHANGELOG.md

@@ -13,6 +13,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Support `authorization_code` OAuth grant type.
 - Documented `http_cors_allowlist` configuration parameter.
 - Added `/api/v1/statuses/{status_id}/thread` API endpoint (replaces `/api/v1/statuses/{status_id}/context`).
+- Accept webfinger requests where `resource` is instance actor ID.
 
 ### Changed
 

src/webfinger/views.rs

@@ -38,10 +38,11 @@ async fn get_jrd(
         parse_acct_uri(resource)?
     } else {
         // Actor ID? (reverse webfinger)
-        let username = parse_local_actor_id(
-            &instance.url(),
-            resource,
-        )?;
+        let username = if resource == local_instance_actor_id(&instance.url()) {
+            instance.hostname()
+        } else {
+            parse_local_actor_id(&instance.url(), resource)?
+        };
         ActorAddress { username, hostname: instance.hostname() }
     };
     if actor_address.hostname != instance.hostname() {