Support "_" placeholder username for domain's own NIP-05

spec/requests/well_known_spec.rb

@@ -2,21 +2,21 @@ require 'rails_helper'
 
 RSpec.describe "Well-known URLs", type: :request do
   describe "GET /nostr" do
-    context "without username param" do
+    describe "without username param" do
       it "returns a 422 status" do
         get "/.well-known/nostr.json"
         expect(response).to have_http_status(:unprocessable_entity)
       end
     end
 
-    context "non-existent user" do
+    describe "non-existent user" do
       it "returns a 404 status" do
         get "/.well-known/nostr.json?name=bob"
         expect(response).to have_http_status(:not_found)
       end
     end
 
-    context "user does not have a nostr pubkey configured" do
+    describe "user does not have a nostr pubkey configured" do
       let(:user) { create :user, cn: 'spongebob', ou: 'kosmos.org' }
 
       before do
@@ -30,7 +30,7 @@ RSpec.describe "Well-known URLs", type: :request do
       end
     end
 
-    context "user with nostr pubkey" do
+    describe "user with nostr pubkey" do
       let(:user) { create :user, cn: 'bobdylan', ou: 'kosmos.org' }
       before do
         user.save!
@@ -67,5 +67,24 @@ RSpec.describe "Well-known URLs", type: :request do
         end
       end
     end
+
+    describe "placeholder username for domain's own pubkey" do
+      it "returns the configured nostr pubkey" do
+        get "/.well-known/nostr.json?name=_"
+        res = JSON.parse(response.body)
+        expect(res["names"]["_"]).to eq(Setting.nostr_public_key)
+      end
+
+      context "nostr service integration not enabled" do
+        before do
+          Setting.nostr_enabled = false
+        end
+
+        it "returns a 404 status" do
+          get "/.well-known/nostr.json?name=_"
+          expect(response).to have_http_status(:not_found)
+        end
+      end
+    end
   end
 end